JP4759127B2 - Throwaway reamer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throw-away reamer in which a throw-away tip is detachably attached to a reamer body.
[0002]
[Prior art]
A throw-away reamer (hereinafter abbreviated as reamer unless otherwise required) is known from, for example, Japanese Patent Application Laid-Open No. 59-166419, Japanese Patent Publication No. 1-23251. In this type of reamer, a throwaway tip having a polygonal flat plate shape is used in a state where one of two adjacent sides functions as a main cutting edge and the other functions as a sub cutting edge. The processing diameter of the reamer is determined by the distance from the reamer axis (referred to as the reamer axis) to the secondary cutting edge, but the secondary cutting edge approaches the reamer axis by a minute amount from the distal end side to the proximal end side. It is often tilted. A so-called back taper is attached, and in this case, the processing diameter of the reamer is determined by the distance from the reamer axis of the end portion of the secondary cutting edge closest to the main cutting edge.
[0003]
In the throw-away reamer, the machining diameter is often adjustable, and it is desirable that the back taper be adjustable. On the other hand, in the throw-away reamer, how to fix the throw-away tip firmly to the reamer body is an important issue, and it is easy to adjust both the machining diameter and the back taper while meeting this requirement. is not. Further, it is desirable that the machining diameter and the back taper can be adjusted independently without affecting each other, but this is not much easier.
[0004]
[Problems to be solved by the invention, means for solving problems and effects]
The present invention is a throw-away reamer that can firmly fix the throw-away tip to the reamer body, and can adjust both the processing diameter and the back taper with a simple configuration. The present invention has been made with the object of providing, and according to the present invention, the throw-away reamer of each aspect described below can be obtained. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the technical features described in the present specification and the combinations thereof to those described in the following sections. . In addition, when a plurality of items are described in one section, it is not always necessary to employ the plurality of items together. It is also possible to select and employ only some items.
[0005]
(1) A throwaway reamer in which a throwaway tip having a polygonal flat plate shape is detachably attached to a reamer body,
Each flat surface has a flat bottom surface and two side surfaces, and is a flat surface in close contact with the first seating surface and the two side surfaces of the throw-away tip that are in close contact with the bottom surface of the throw-away tip. A seat with a first mounting seat having two first receiving surfaces;
A second mounting seat having a second seating surface and two second receiving surfaces corresponding to the bottom surface and two side surfaces of the seat, respectively, and the two second receiving surfaces are respectively (a) radial direction of the reamer A radial receiving surface that abuts one of the two side surfaces of the sheet to define an axial position of the sheet; and (b) extends substantially in the axial direction of the reamer and the two side surfaces of the sheet. A reamer body that is an axially receiving surface that forms a wedge-shaped gap in which the gap increases with the other end of the reamer,
Inserted in the wedge-shaped gap, by the portion located at the same position as the main cutting edge of the throw-away tip in the axial direction of the reamer between the axial receiving surface and one of the two side surfaces of the sheet facing the axial receiving surface A wedge member sandwiched between,
A first adjusting device for adjusting an insertion depth of the wedge member into the wedge-shaped gap;
A gap between a portion of the axial receiving surface and one of the two side surfaces of the sheet opposed to the axial portion of the thrower tip that is separated from the main cutting edge of the throw-away tip in the axial direction of the reamer. A second adjusting device for adjusting;
With the throwaway tip received in the first mounting seat and the seat received in the second mounting seat, the throwaway tip is attached to the radial receiving surface, the axial receiving surface, and the throwaway tip, respectively. A clamping device for applying a clamping force in a direction to approach the second seating surface and clamping the throw-away tip and the seat to the reamer body;
A throw-away reamer (Claim 1), wherein an inclination angle of the axial receiving surface of the reamer body with respect to the axial direction of the reamer is equal to or less than a wedge angle of the wedge member.
In this throw-away reamer, the throw-away tip is received by the seat with its bottom surface and two side surfaces in close contact with the first seating surface and the two first receiving surfaces of the seat first mounting seat, The seat is received by the second mounting seat of the reamer body. The seat has a bottom surface that is in close contact with the second seat surface of the second mounting seat, and one of the two side surfaces is directly received by the radial receiving surface of the second mounting seat, while the other of the two side surfaces is via a wedge member. It is received by the axial receiving surface of the second mounting seat. Due to the necessity of adjusting the back taper, one of the two side surfaces of the seat is not completely in contact with the radial receiving surface, and the wedge member is completely in contact with the other side surface of the seat with the axial receiving surface. It is not necessarily sandwiched between. However, they are in contact with each other in the plane, and the amount of adjustment of the back taper is usually very small, so the angle between the planes in contact with each other is very small, and it is considered that they contact on a substantially wide surface. It will be safe. Therefore, the sheet supporting rigidity by the reamer body can be sufficiently increased. Since the throw-away tip is supported with high support rigidity by the close contact state of the three pairs of planes on the sheet, the support rigidity of the throw-away tip by the reamer body can be sufficiently increased.
In addition, the wedge member is inserted into the wedge-shaped gap, and is sandwiched between the axial receiving surface and the side surface of the sheet facing the wedge member positioned in the vicinity of the main cutting edge of the throw-away tip in the reamer axial direction. Does not change even if the seat is rotated along the second seating surface of the second mounting seat to adjust the back taper. In addition, since the rotation angle for adjusting the back taper of the sheet can be very small, the straight line connecting the contact point of the sheet with the wedge member and the end of the secondary cutting edge on the main cutting edge side should be perpendicular to the axis of the reamer. The change in the machining diameter due to the inclination of this straight line can be ignored. Therefore, even if the back taper is adjusted after adjusting the processing diameter, the processing diameter does not change.
The second adjusting device is interposed between the axial receiving surface and the side surface of the sheet facing the axially receiving portion between the portions of the reamer axially disengaged from the main cutting edge of the throw-away tip toward the proximal side of the reamer. Therefore, it is desirable to adjust the gap between the two parts, but by interposing the gap between the other parts and adjusting the gap between the other parts, as a result, It is good also as what adjusts a clearance gap. For example, the radial receiving surface is formed only on the outer peripheral side of the reamer body, and is interposed between the inner peripheral side portion of the reamer main body and the reamer main body, of the side surfaces contacting the radial receiving surface of the throw-away tip. Thus, by providing a second adjusting device for adjusting the gap between the two, as a result, the main cutting edge of the throw-away tip in the axial direction of the reamer between the axial receiving surface and the side surface of the sheet facing the axial receiving surface It is also possible to adjust the gap between the portions deviating from the base to the base end side of the reamer.
(2) As the throw-away tip, one that has a clamp hole that penetrates the central portion in the thickness direction and has a tapered inner peripheral surface with a larger diameter toward the surface side is used.
The clamping device is
A through hole formed in a portion of the first seat surface of the seat corresponding to a clamp hole of the throw-away tip;
A female screw hole formed in the second bearing surface of the reamer body;
A male screw part is provided at the tip part, and a taper outer peripheral surface corresponding to the taper inner peripheral surface of the throwaway tip is provided at the end part, and the male screw part passes through the clamp hole of the throwaway tip and the through hole of the seat. When the outer peripheral surface of the taper is engaged with the female screw hole and the tapered outer peripheral surface is engaged with the tapered inner peripheral surface in an eccentric state, the throwaway tip is attached to the throwaway tip in the radial direction receiving surface, the axial direction receiving surface, and the second seat. A clamping screw that applies clamping force in a direction to approach the surface
The position of the female screw hole of the reamer body is in a direction approaching the radial receiving surface and the axial receiving surface with respect to the clamp hole of the throw-away tip in a state of being clamped by the clamp screw. The throw-away reamer according to item (1), which is eccentric.
(3) Throw-away tip that has a generally polygonal flat plate shape, penetrates the central part in the thickness direction, and has a tapered inner peripheral surface with a larger diameter toward the surface side can be attached to and detached from the reamer body. A throwaway reamer attached to the
Each of the flat surfaces has a flat bottom surface and two side surfaces, and has a substantially flat plate shape. The first seating surface is a flat surface that is in close contact with the bottom surface of the throw-away tip, and the flat surface is in close contact with the two side surfaces of the throw-away tip. A seat in which a first mounting seat having two first receiving surfaces is formed and a through hole is formed at a position corresponding to the clamp hole of the throw-away tip on the first seat surface;
A second mounting seat having a second seating surface and two second receiving surfaces respectively corresponding to the bottom surface and two side surfaces of the sheet is formed, and the two second receiving surfaces are respectively (a) the reamer A radial receiving surface that extends substantially radially and abuts one of the two side surfaces of the sheet to define an axial position of the sheet; and (b) extends substantially in the axial direction of the reamer and A female screw is provided at a position substantially corresponding to the through-hole of the seat on the second seat surface, and is formed as a wedge-shaped clearance surface that forms a wedge-shaped clearance gap between the other side surface and the tip end side of the reamer. A reamer body with holes,
Inserted in the wedge-shaped gap and at least a portion of the axial receiving surface and the other of the two side surfaces of the sheet facing each other located in the vicinity of the main cutting edge of the throw-away tip in the axial direction of the reamer A wedge member sandwiched between,
A first adjusting device for adjusting an insertion depth of the wedge member into the wedge-shaped gap;
A gap between the axial receiving surface and the other one of the two side surfaces of the sheet opposed to the axial portion of the reamer in the axial direction between the main cutting edge of the throw-away tip and the base end side of the reamer. A second adjusting device for adjusting;
A male screw portion is provided at the tip portion, and a taper outer peripheral surface corresponding to the taper inner peripheral surface is provided at the distal end portion. The male screw portion is screwed into the female screw hole through the through hole of the throw-away tip and the seat, and is tapered. A clamp in a direction that causes the throwaway tip to approach the radial receiving surface, the axial receiving surface, and the second seat surface by engaging an outer peripheral surface eccentrically with the tapered inner peripheral surface. A clamping screw that applies force and clamps the throw-away tip and seat to the reamer body;
A throwaway reamer characterized by containing.
(4) The throw-away tip is positioned on the first mounting seat by the first seat surface and the two first receiving surfaces, and the seat is the second seat surface, the radial receiving surface and the axial receiving surface. In a direction in which the female screw hole of the second seat surface approaches the radial receiving surface and the axial receiving surface with respect to the through hole of the throw-away tip in a state where the second mounting seat is positioned by The throw-away reamer according to the item (2) or (3), which is formed at a position where the state is eccentric.
If the male screw part of the clamp screw is screwed into the eccentric female screw hole as described above and tightened, the taper outer peripheral surface of the clamp screw engages with the taper inner peripheral surface of the through hole of the throw-away tip in an eccentric state, and The away tip is pushed toward both the radial receiving surface and the axial receiving surface. As a result, the throw-away tip is pressed against the two first receiving surfaces of the sheet, and the sheet is pressed directly against the radial receiving surface of the reamer body, and against the axial receiving surface via a wedge member. The throw-away tip will be firmly received by the reamer body.
(5) The first adjusting device is
A first inclined surface formed at an end of the wedge member on the distal end side of the reamer and inclined to approach the second seat surface as it goes toward the distal end side of the reamer;
A female screw hole formed at a right angle to the second seat surface in an overhang portion provided in a state of covering the second seat surface on the reamer body,
A first adjustment that is screwed into the female screw hole and engages with the first inclined surface of the wedge member at the tapered outer peripheral surface formed at the tip, and pushes the wedge member from the larger side of the wedge-shaped gap toward the smaller side. Screw and
The throw-away reamer according to any one of (1) to (4) (including claim 3).
When the first adjusting screw is tightened into the female screw hole of the overhang portion, the outer peripheral surface of the taper acts on the first inclined surface of the wedge member, and pushes the wedge member inward of the wedge-shaped gap. The wider part is sandwiched between the sheet and the axial receiving surface of the reamer body, and the distance from the reamer axis of the auxiliary cutting edge of the throw-away tip increases, and the machining diameter increases. Conversely, if the first adjustment screw is loosened, the wedge member is allowed to move outwardly in the wedge-shaped gap, and the machining diameter can be reduced.
An adjustment piece having an inclined surface corresponding to the first inclined surface of the wedge member is held in the overhang portion so as to be movable in a direction substantially perpendicular to the second seat surface, and the adjustment piece is moved closer to the second seat surface by an adjustment screw. It is possible to push the wedge member inwardly of the wedge-shaped gap by pushing it in the direction that it is pushed, but as in this section, the tapered outer peripheral surface formed at the tip of the adjustment screw is the first of the wedge member. The configuration is simple and sufficient to press against the inclined surface. Even if the cutting force acting on the throw-away tip is transmitted to the wedge member via the sheet, the force is received by the axial receiving surface, so a large force acts between the first inclined surface and the tapered outer peripheral surface. No line contact between the two is sufficient.
(6) The second adjusting device is
The wedge member extends in a direction parallel to the side surface of the wedge member on the axial receiving surface side of the wedge member in the axial direction of the reamer from the main cutting edge of the throw-away tip toward the proximal end side of the reamer. And a second inclined surface formed by inclining in a direction closer to the second seat surface as it approaches the side surface on the axial receiving surface side,
A female screw hole formed at a right angle to the second seat surface in an overhang portion provided in a state of covering the second seat surface on the reamer body,
A second adjustment screw screwed into the female screw hole;
The reamer body is provided with an inclined surface that is movably held in a direction perpendicular to the second seating surface and corresponds to the second inclined surface of the wedge member, and the inclined surface is the second adjustment screw of the second adjustment screw. An adjustment member that pushes the wedge member and the seat to the outer peripheral side of the reamer body by being pressed against the second inclined surface as the seat surface moves.
The throw-away reamer according to any one of (1) to (5) (claim 4).
The “adjusting member” can be, for example, a tapered shaft portion formed integrally with the tip of the second adjusting screw. In this case, the adjusting member is configured integrally with the second adjusting screw, and the outer peripheral tapered surface of the tapered shaft portion functions as an inclined surface corresponding to the second inclined surface of the wedge member. The “adjusting member” may be an adjusting piece configured separately from the second adjusting screw. In this case, the adjusting piece has an inclined surface corresponding to the second inclined surface of the wedge member, and is slidably fitted into the fitting hole formed at a substantially right angle to the second seat surface on the reamer body. By being pushed by the second adjusting screw from behind, the wedge member is pushed against the second inclined surface. In any case, the wedge member and the sheet are pushed out to the outer peripheral side of the reamer body by the effect of the inclined surface, and the auxiliary cutting edge of the throw-away tip is rotated by a minute angle with respect to the reamer axis, reducing the back taper. Be made. On the contrary, if the second adjustment screw is loosened, the sheet and the wedge member are allowed to rotate in the direction opposite to the above direction, and the back taper can be increased. According to the adjusting piece, it is possible to make contact with the second inclined surface of the wedge member over a wider surface than in the case of the tapered shaft portion at the tip of the second adjusting screw, so that the cutting resistance force acting on the throw-away tip is reduced to the sheet, wedge. The reamer body can be firmly received via the member and the adjustment piece, and the holding rigidity of the throw-away tip by the reamer body can be increased. On the other hand, when the tapered shaft portion at the tip of the second adjustment screw is used, there is an advantage that the configuration is simple. Since the second inclined surface extends in parallel with the side surface on the axial receiving surface side of the wedge member, even if the wedge member is moved along the axial receiving surface for adjusting the machining diameter, the throw-away tip The back taper of the secondary cutting edge does not change. In addition, as described above with respect to the above item (1), even if the back taper is adjusted after adjusting the machining diameter, the machining diameter does not change by that, so according to this aspect, the machining diameter is adjusted. Adjustment and back taper adjustment can be performed independently of each other.
(7) The second adjusting device is
A female screw hole formed through the sheet in a direction parallel to the bottom surface of the sheet and a side surface received by the radial receiving surface of the sheet;
A second adjusting screw that is screwed into the female screw hole and that abuts the wedge member at the tip or directly against the axial receiving surface to push the sheet away from the axial receiving surface; The throw-away reamer according to any one of (5) (Claim 5).
Even in this embodiment in which the second adjusting screw abuts against the axial receiving surface via the wedge member, even if the machining diameter is adjusted by adjusting the amount of insertion of the wedge member into the wedge-shaped gap, the back taper is thereby reduced. Since there is no change, the adjustment of the processing diameter and the adjustment of the back taper can be performed completely independently.
(8) The second adjusting device is
The side of the sheet on the side of the wedge member on the portion of the sheet that is separated from the main cutting edge of the throw-away tip in the axial direction of the reamer toward the proximal end of the reamer and that faces the wedge member And a second inclined surface formed to be inclined toward the second seat surface as it approaches the side surface on the wedge member side,
A female screw hole formed at a right angle to the second seat surface in an overhang portion provided in a state of covering the second seat surface on the reamer body,
A second adjustment screw screwed into the female screw hole;
The reamer body is held so as to be movable in a direction perpendicular to the second seating surface, has an inclined surface corresponding to the second inclined surface of the seat, and is pressed against the second inclined surface by the second adjusting screw. An adjustment member that pushes the seat in a direction away from the axial receiving surface;
The throw-away reamer according to any one of (1) to (5).
In this reamer, the machining diameter does not change even if the back taper is adjusted after the machining diameter is adjusted. However, if the machining diameter is adjusted after the back taper is adjusted, the back taper changes. Therefore, it is desirable that the processing diameter is adjusted before the back taper. In this aspect, the wedge member may be shortened so as not to interfere with the second adjustment screw, but instead of being shortened, the portion facing the second inclined surface has a shape that does not interfere with the second adjustment screw. It is desirable that
(9) The first adjustment device further includes:
A third inclined surface formed with an inclination opposite to the first inclined surface at an end of the wedge member opposite to the side on which the first inclined surface is formed;
A female screw hole formed in the overhang portion of the reamer body at a substantially right angle to the second seat surface;
A third adjusting screw that is screwed into the female screw hole and engages with the third inclined surface at a tapered outer peripheral surface formed at the tip, and pushes the wedge member outward of the wedge-shaped gap (5) Or the throwaway reamer according to any one of the items (8).
(10) On the outer peripheral surface of the columnar portion of the reamer body, A groove extending in parallel to the central axis of the reamer body, the groove having a first side wall surface and a second side wall surface parallel to each other and having a rectangular cross-sectional shape is formed, A portion of the first side wall forming the first side wall surface on the outer peripheral side of the columnar portion is cut by a cutting plane parallel to the axial direction of the columnar portion and perpendicular to the first side wall surface. The remaining part is the overhang part. (5) Item (9) Any one of A throwaway reamer according to claim 7 (claim 7).
According to this aspect, the overhang portion can be easily formed in the reamer body. The rectangular groove can be formed by, for example, electric discharge machining.
(11) The throw-away reamer according to any one of (1) to (10), wherein the two side surfaces of the sheet are substantially orthogonal to each other.
(12) The throw according to any one of (1) to (11), wherein one of the two first receiving surfaces of the sheet extends substantially in the axial direction of the reamer and the other extends substantially in the radial direction. Away reamer.
In this throw-away reamer, a nearly square or rectangular chip is used as the throw-away tip. The nearly square throw-away tip can selectively use the vicinity of the four apexes as the cutting edge portion. The nearly rectangular throw-away tip can have two apex vicinity parts as a blade edge part.
(13) Provided on the outer peripheral surface of the columnar portion of the reamer main body in a state of projecting radially outward from the outer peripheral surface, contacting the inner peripheral surface of the hole to be processed processed by the throw-away reamer. The throw-away reamer according to any one of (1) to (12), wherein a guide pad is provided to keep the throw-away reamer and the hole to be processed concentrically (claim 8).
The throw-away reamer provided with the guide pad is known as a reamer with high machining accuracy, but if the present invention is applied to the throw-away reamer provided with the guide pad, the machining accuracy can be further improved. It is effective.
(14) The throw-away reamer according to (13), wherein a plurality of the guide pads are provided apart from each other in the circumferential direction.
(15) The throwaway reamer according to (13) or (14), wherein the guide pad extends parallel to the axial direction of the throwaway reamer.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a throw-away reamer (hereinafter simply referred to as a reamer) according to a first embodiment of the present invention. As shown in the figure, the reamer includes a reamer body 10 having a generally stepped shaft shape. The reamer main body 10 has a main body portion 12 extending in a columnar shape, and a flange portion 14 is formed coaxially at a base end portion (a rear end portion and a right end in the drawing) of the main body portion 12. Yes. The flange portion 14 extends outward in the radial direction from the outer peripheral surface of the main body portion 12 and has a large diameter. A fitting protrusion 20 extends from a rear end surface 18 opposite to the front end surface 16 on the main body 12 side of the flange portion 14. The fitting projection 20 is fitted into a fitting hole of an adapter (not shown), and the rear end surface 18 of the flange portion 14 is brought into contact with the tip end surface of the adapter, whereby the reamer body 10 is radially oriented with respect to the adapter. And an axial position is defined. A plurality of bolt holes 30 penetrating the flange portion 14 in the axial direction are formed at equiangular intervals, while a female screw hole is formed in a portion corresponding to the bolt hole 30 on the tip surface of the adapter. The bolt which omits is screwed into the female screw hole through the bolt hole 30, whereby the reamer body 10 is fixed to the adapter. The adapter is fixed to a tool spindle (not shown), and eventually the reamer body 10 is attached to the tool spindle via the adapter.
[0007]
The main body 12 has a relatively large diameter shank 40 and a relatively small diameter body 42. A shank 40 is formed to extend from the front end face 16 of the flange portion 14 in the axial direction, and a body 42 extends coaxially from the front end of the shank 40. As shown in FIG. 2, a part of the outer periphery of the shank 40 is cut out along a plane parallel to the axial direction, and the portion is formed by the formation of a rotation balance (to be described later, a chip discharge groove 84 or the like. The flattening portion 46 (for eliminating the rotational imbalance of the reamer body 10) is formed. A coolant hole 48 is formed continuously from the rear end surface 47 of the fitting protrusion 20 to the middle of the body 42. A plurality of communication holes 50 that allow the coolant hole 48 to communicate with the outer periphery of the body 42 are formed from the vicinity of the tip of the coolant hole 48. The communication hole 50 is formed so as to be inclined so as to be located on the outer peripheral side toward the tip side.
[0008]
A tip holding portion 60 that holds a throw-away tip (hereinafter simply referred to as a tip) having a cutting edge is formed near the tip of the body 42. The chip will be described in detail later. As shown in FIG. 3, the chip holding part 60 is formed in a size that occupies about a quarter of the outer periphery of the guide part. This reamer is a single-blade reamer in which one chip holding portion 60 is formed. A plurality of guide pads 62 are arranged on the outer periphery near the tip of the body 42 and excluding the chip holding portion 60. Specifically, a plurality of axially extending grooves 64 are formed on the outer periphery of the body 42, and guide pads 62 are respectively fitted and fixed to the grooves 64. The depth of the groove 64 is smaller than the thickness of the guide pad 62, and the guide pad 62 is provided so as to slightly protrude from the body 42 in the radial direction. The coolant jet 66 that is the outer peripheral side opening of each communication passage 50 is formed at a phase position different from those of the guide pads 62.
[0009]
The chip holding unit 60 includes a sheet holding unit 72 that holds a sheet 102 described later. The sheet holding portion 72 is formed in a rectangular groove shape extending in the axial direction, and the first side wall surface 74 of the rectangular groove is located on a plane substantially including the central axis of the reamer body, and is parallel to the first side wall surface 74. A second side wall surface 76 is formed. The second side wall surface 76 functions as a seating surface on which a bottom surface of a later-described seat 102 is seated, and the first side wall surface 74 functions as an overhanging surface that covers the seating surface. Therefore, the second side wall surface 76 is referred to as a seat surface 76, and the first side wall surface 74 is referred to as an overhang surface 74. As shown in FIG. 4, the sheet holding portion 72 is further defined by a bottom surface 78 and an end surface 80 of the rectangular groove. The bottom surface 78 extends substantially parallel to the axial direction of the body 42, and the end surface 80 extends in the radial direction of the body 42. Since the bottom surface 78 and the end surface 80 function as receiving surfaces that receive the side surfaces of the sheet 102, the bottom surface 78 is referred to as an axial receiving surface 78, and the end surface 80 is referred to as a radial receiving surface 80.
[0010]
The rectangular groove is formed so as to be deeper toward the front end side of the body 42, and the axial receiving surface 78 which is the bottom surface of the rectangular groove is inclined by a small angle with respect to the axial direction of the body 42 ( (See FIG. 4). Moreover, the end surface of the rectangular groove is a stepped surface, and the outer peripheral side portion of the body 42 is located closer to the distal end side of the body 42 than the central side portion. Therefore, what functions as the radial receiving surface 80 is the portion of the end surface of the body that is the stepped surface, and the portion of the end surface that is on the inner periphery side of the body functions as the escape portion 82. Further, the axial direction receiving surface 78 and the radial direction receiving surface 80 form an obtuse angle with each other, and are orthogonal to the seat surface 76 and the overhang surface 74 located on both sides. The sheet holding portion 72 configured as described above can be formed by, for example, electric discharge machining, and the seating surface 76, the axial direction receiving surface 78, and the radial direction receiving surface 80 are reduced in surface roughness by lapping finishing or the like. It is desirable to do.
[0011]
A groove 84 is formed in the front of the sheet holding portion 72 in the circumferential direction. The bottom surface 86 of the groove 84 is formed at right angles to the seat surface 76 and the overhang surface 74. The groove 84 is shallower than the rectangular groove forming the sheet holding portion 72, and is approximately half the depth in the illustrated example. Further, the groove 84 is formed longer in the axial direction than the rectangular groove, and communicates with the sheet holding portion 72 at a portion overlapping the sheet holding portion 72. The overhanging surface 74 of the sheet holding portion 72 is formed at a height that reaches the bottom surface 86 of the groove 84, and the bottom surface 86 of the groove 84 is formed at the upper end of the overhanging surface 74 so as to be orthogonal to the overhanging surface 74. The groove 84 is formed in a V-groove shape by a bottom surface 86 thereof and a side surface 88 parallel to the overhang surface 74, and the side surface 88 is formed slightly on the seat surface 76 side from the overhang surface 74. A portion defined by the overhang surface 74 of the sheet holding portion 72 and the bottom surface 86 of the groove 84 is an overhang portion 90 that covers the seat surface 76 when viewed from a direction perpendicular to the seat surface 76. The overhanging surface 74 and the side surface 88 may be slightly inclined with respect to each other.
[0012]
The chip 100 is attached to the reamer body configured as described above. The chip 100 is fixed to the sheet holding portion 72 of the reamer body via the sheet 102, and the wedge member 104 is inserted between the sheet 102 and the sheet holding portion 72.
[0013]
As shown in FIGS. 5 and 6, the wedge member 104 generally has a rectangular bar shape in cross section, and extends along the axial direction of the reamer body 10. The side surface 106 of the wedge member 104 is inclined by a relatively small angle from a state parallel to the side surface 108, and the inclination angle is an inclination of the axial receiving surface 78 of the sheet holding portion 72 with respect to the axial direction of the body 42. It is the same as the angle. A wedge-shaped gap is formed between the axial receiving surface 78 and a side surface (an axial side surface 128 described later) facing the axial receiving surface 78 of the sheet 102, and the wedge member 104 is formed in the wedge-shaped gap. However, the wedge angle of the wedge member 104 is the same as the wedge angle of the wedge-shaped gap. The side surface 106 of the wedge member 104 is in close contact with the axial receiving surface 78, and the axial side surface 128 of the sheet 102 is in close contact with the side surface 108 of the wedge member 104, and faces the radial receiving surface 80 of the sheet 102. The side surface (radial side surface 130 described later) is in close contact with the radial receiving surface 80. The thickness of the wedge member 104 is slightly smaller than the thickness of the sheet holding portion 72 (the width of the rectangular groove) so that the wedge member 104 can slide in the sheet holding portion 72 stably.
[0014]
Two inclined surfaces 112 and 114 are formed at both ends in the longitudinal direction of the wedge member 104 on the upper surface 110 of the wedge member 104 opposite to the bottom surface 109 that is in close contact with the seating surface 76. The first inclined surface 112, which is one of the two inclined surfaces 112, 114, is formed on the top end portion of the upper surface 110, which is the end portion on the front end side of the body 42, and the sheet holding portion toward the front end side in the axial direction. It is inclined to approach the seat surface 76 of 72. The second inclined surface 114, which is the other of the two inclined surfaces, is formed at the axial rear end portion of the wedge member 104, and is inclined so as to approach the seat surface 76 toward the axial rear end side. Each surface of the wedge member 104 is lapped and formed with high accuracy.
[0015]
As shown in FIG. 7, the overhanging portion 90 of the reamer main body is overhanged in the direction perpendicular to the seating surface 76 (direction perpendicular to the upper surface 110 of the wedge member 104) at the distal end portion of the body near the distal end of the body 42. A first female screw hole 116 is formed through the portion 90. The first female screw hole 116 is formed at a position facing the first inclined surface 112 of the wedge member 104 when the wedge member 104 is disposed in the sheet holding portion 72. A first adjustment screw 120 is screwed into the first female screw hole 116. The first adjustment screw 120 has a tapered portion 122 having a tapered outer peripheral surface at a tip portion that is an end portion on the side facing the wedge member 104 (see FIG. 11), and the inclination angle of the first adjusting screw 120 is the first inclination of the wedge member 104. It is formed the same as the surface 112. Although not shown, a hexagonal hole for engaging with a hexagonal bar spanner, which is a rotary tool, is formed on the rear end surface of the first adjustment screw 120. The overhang portion 90 is further formed with a second female screw hole 124 parallel to the first female screw hole 116 at the rear end. The second female screw hole 124 is formed at a position facing the second inclined surface 114, and a second adjustment screw 126 similar to the first adjustment screw 120 is screwed into the second female screw hole 124. The axial position of the wedge member 104 relative to the sheet holding portion 72 can be adjusted by the first and second inclined surfaces 112 and 114 and the two adjusting screws 120 and 126 (see FIG. 12). The adjustment work will be described in detail later.
[0016]
In the sheet holding portion 72, the sheet 102 is disposed on the outer side in the radial direction of the wedge member 104. As shown in FIGS. 8 and 9, the sheet has a generally rectangular plate shape, and the axial side surface 128 of the sheet 102 is in close contact with the side surface 108 of the wedge member 104 as described above. In that state, the radial side surface 130 of the sheet 102 perpendicular to the axial side surface 128 is designed to be in close contact with the radial receiving surface 80 of the sheet holding portion 72.
[0017]
A chip seat 134 that holds the chip 100 is formed on the upper surface 132 of the sheet 102. The tip seat 134 is formed in a rectangular shape and is defined by an axial receiving surface 136 extending substantially parallel to the axial direction, a radial receiving surface 138 extending substantially parallel to the radial direction, and a seating surface 142 parallel to the upper surface 132. Yes. The axial receiving surface 136 and the radial receiving surface 138 are formed so that the back taper of the chip 100 is about 1 degree when the chip 100 is held. Specifically, when the sheet 102 is disposed on the sheet holding portion 72, the axial receiving surface 136 is inclined by about 1 degree so that the distal end side is positioned radially outward, and the radial receiving surface 138 is It is inclined by about 1 degree so that it is located forward in the axial direction toward the radially inner side. A clearance 144 is formed between the axial receiving surface 136 and the radial receiving surface 138. The axial direction receiving surface 136 and the radial direction receiving surface 138 are inclined according to the clearance angle of the chip 100. The chip seat 134 is formed to be slightly smaller than the size of the chip 100 to be described later, and the chip 100 is fixed in a state where the chip 100 protrudes from the seat 102 little by little in the circumferential direction, the axial direction, and the radial direction of the body 42. . In other words, the chip seat 134 is formed slightly shallower than the thickness of the chip 100, and the axial receiving surface 136 and the radial receiving surface 138 are slightly smaller than the longitudinal and lateral lengths of the chip 100, respectively. is there. A through hole 146 that penetrates the sheet 102 is formed in the center of the seat surface 142 in a direction orthogonal to the seat surface 142.
[0018]
Further, the sheet 102 is parallel to the bottom surface 147 of the sheet 102 at the rear end portion (the end portion on the base end side of the body 42) on the axial side surface 128. Almost A female screw hole 148 penetrating in a direction perpendicular to the right angle is formed. The female screw hole 148 is formed at a position where it does not interfere with the tip seat 134. The adjustment screw 150 is screwed into the female screw hole 148 from the outer peripheral side surface of the sheet 102, and the end surface 152 of the adjustment screw 150 protrudes from the inner opening of the female screw hole 148 and comes into contact with the wedge member 104. The size of the gap 129 between 102 and the wedge member 104 can be adjusted. The end surface 152 of the adjusting screw 150 on the side that comes into contact with the wedge member 104 is formed in a convex spherical shape, and is brought into contact with the wedge member 104 substantially on the axis. The adjusting screw 150 is shorter than the female screw hole 148 so that it does not protrude from the outer peripheral side surface of the seat 102.
[0019]
The chip 100 is accommodated in the chip seat 134 of the sheet 102. The chip 100 has a generally square plate shape, and a cutting edge 160 is formed on each of the four sides of the square. A through hole 161 that penetrates the chip 100 in the thickness direction is formed in the center of the chip 100. As shown in FIG. 13, a portion of the through hole 161 on the upper surface 132 side is a tapered hole having a tapered inner peripheral surface 162 whose diameter is larger toward the upper surface 132 side. A female threaded hole 164 is formed in the seating surface 76 of the seat holding portion 72 of the body 42, and the female threaded hole 164 is axially received with respect to the through hole 161 of the chip 100 and the through hole 146 of the sheet 102. It is formed in an eccentric position so as to approach both the surface 78 and the radial receiving surface 80. Therefore, a clamp screw 168 having a tapered outer peripheral surface 166 at the head is screwed into the female screw hole 164 through the through holes 161 and 146, so that the tapered outer peripheral surface 166 is eccentric to the tapered inner peripheral surface 162 of the chip 100. The chip 100 is pressed against the two receiving surfaces 136 and 138, and the sheet 102 is pressed directly against the radial receiving surface 80 and indirectly against the axial receiving surface 78 via the wedge member 104. Eventually, the chip 100 is positioned and fixed with respect to the body 42.
[0020]
In the reamer configured as described above, among the four cutting blades 160 of the chip 100, the cutting blade 160 located on the distal end side of the body 42 is the main cutting blade 160A, and the cutting blade 160 located on the outer peripheral side of the body 42. Functions as the auxiliary cutting edge 160B. The sub cutting edge 160B is inclined at a minute angle in a direction approaching the central axis of the body 42 from the distal end side to the proximal end side of the body 42. Therefore, the processing diameter of the reamer is determined by the distance of the end of the secondary cutting edge 160B on the main cutting edge 160A side from the center axis of the body 42, that is, the reamer's rotation axis. Hereinafter, the adjustment of the machining diameter and the back taper will be described with reference to FIG. However, FIG. 12 is shown with the overhang portion 90 removed for easy understanding.
[0021]
First, the wedge member 104 is disposed in the sheet holding portion 72. In this state, the first and second adjusting screws 120 and 126 that adjust the axial position of the wedge member 104 are slightly protruded from the overhanging surface 74 to prevent the wedge member 104 from slipping forward in the axial direction. The axial movement within a certain range is allowed. The sheet 102 is disposed so as to contact the wedge member 104, and the clamp screw 168 is loosely screwed into the female screw hole 164, so that the chip 100 and the sheet 102 are prevented from dropping from the reamer body 10.
[0022]
Next, in a state where the sheet 102 is pressed against the wedge member 104, the first adjustment screw 120 screwed into the first female screw hole 116 is rotated and brought into contact with the first inclined surface 112 of the wedge member 104. . When the first adjusting screw 120 is further rotated from this state, the wedge member 104 is moved rearward in the axial direction, and the sheet 102 is moved radially outward. When the radial position of the sheet 102 (that is, the sub cutting edge 160B of the chip 100) is appropriate (when the machining diameter is appropriate), the rotation of the first adjustment screw 120 is stopped. If the machining diameter becomes excessive, the first adjusting screw 120 is slightly loosened to allow the wedge member 104 to move forward in the axial direction, and the second female screw hole 124 The screwed second adjustment screw 126 is rotated, and the wedge member 104 is moved in the axial direction. As described above, when the axial position of the wedge member 104 is adjusted, if the radial position of the auxiliary cutting edge 160B of the chip 100 is appropriate, that is, if the machining diameter becomes a desired size, the adjusting screw The adjustment screw on the currently loosened side of 120 and 126 is also tightened to prevent the wedge member 104 from moving in the axial direction. This completes the adjustment of the machining diameter.
[0023]
Next, the back taper is adjusted. As described above, the side surface 106 of the wedge member 104 is in close contact with the axial receiving surface 78 and the axial side surface 128 of the sheet 102 is in close contact with the side surface 108 of the wedge member 104 before adjusting the back taper. However, the adjustment screw 150 screwed into the sheet 102 is rotated and the adjustment screw 150 is protruded radially inward from the sheet 102, whereby a gap 129 is formed between the sheet 102 and the wedge member 104. (See FIG. 12). The sheet 102 is rotated by a small angle while being in close contact with the seat surface 76, and with this rotation, the radial side surface 130 of the sheet 102 is inclined with respect to the radial receiving surface 80, and the radial receiving is performed. The surface 80 comes into contact with the end on the radially inner side.
[0024]
The secondary cutting edge 160B of the chip 100 is in an initial state, that is, before the adjustment of the back taper is performed, the state of having an excessive back taper, but by rotating the sheet 102 as described above, The back taper decreases and eventually reaches an appropriate value. In this state, as described above, the radial side surface 130 of the sheet 102 comes into contact with the inner peripheral side portion of the radial direction receiving surface 80, but the radius of the sheet 102 is formed because the escape portion 82 is formed. The direction side surface 130 contacts the radial direction receiving surface 80 at a position close to the outer periphery. If the back taper is excessive, the chip 100 together with the sheet 102 is rotated in a direction (counterclockwise in FIG. 12) in which the gap 129 between the sheet 102 and the wedge member 104 is reduced.
As described above, it has been described that the adjustment of the machining diameter is performed first and the back taper is adjusted later. However, the adjustment of the machining diameter may be performed after the adjustment of the back taper.
[0025]
As described above, when the adjustment of the processing diameter and the back taper is completed, the clamp screw 168 is tightened, and the chip 100 and the sheet 102 are fixed to the reamer body 10 together. At this time, since the taper outer peripheral surface 166 of the clamp screw 168 is engaged with the taper inner peripheral surface 162 of the chip 100 in an eccentric state, the two side surfaces of the chip 100 are respectively received in the axial direction receiving surface 136 and the radial direction receiving surface of the sheet 102. The axial side surface 128 of the sheet 102 and the adjusting screw 150 are pressed against the axial receiving surface 78 via the wedge member 104, and the radial side surface 130 of the sheet 102 is further pressed against the radial receiving surface 80. The chip 100 is fixed in a state of being positioned with respect to the reamer body 10.
[0026]
In this fixed state, as shown in FIG. 12, the axial side surface 128, which is the surface facing the wedge member 104 of the sheet 102, is brought into contact with the wedge member 104 at the front end portion thereof, and the clearance is increased toward the rear in the axial direction. 129 becomes larger. Further, the side surface 130 in the radial direction of the sheet 102 is brought into contact only with the end on the radially inner side of the radial receiving surface 80 of the reamer body 10. Therefore, the sheet 102, the wedge member 104, and the reamer main body 10 come into contact with each other in a straight line if they are rigid bodies, but the gap between the radial side surface 130 and the radial receiving surface 80, and the gap 129 The angle is very small, and the reamer main body 10, the sheet 102, and the wedge member 104 are slightly deformable, so that they actually contact on a relatively wide surface. Accordingly, the holding rigidity of the sheet 102 by the reamer body 10 is sufficiently high, and eventually the holding rigidity of the chip 100 by the reamer body 10 is also sufficiently high.
[0027]
As is clear from the above description, in this embodiment, the wedge member 104, the first inclined surface 112, the first adjustment screw 120, the second inclined surface 114, and the second adjustment screw 126 cooperate with each other as “first. The wedge member 104 and the adjusting screw 150 together form a “second adjusting device”. The tip seat 134 constitutes a “first attachment seat”, and the sheet holding portion 72 constitutes a “second attachment seat”.
[0028]
According to this reamer, the adjustment of the machining diameter and the adjustment of the back taper can be performed independently. For example, even when the back taper is adjusted after adjusting the machining diameter, the wedge member 104 and the sheet 102 are moved to the front end of the sheet 102 in the axial direction, that is, the main cutting edge 160A of the auxiliary cutting edge 160B of the chip 100 with respect to the axial direction. Since the adjacent portions are in contact with each other, the radial position of the portion adjacent to the main cutting edge 160A of the sub cutting edge 160B does not change with the rotation of the sheet 102. Further, even if the processing diameter is adjusted after the back taper is adjusted, the axial front end portion and the axial rear end portion of the sheet 102 are moved in the radial direction by the same amount as the wedge member 104 moves in the longitudinal direction. Since the sheet 102 does not rotate, the back taper does not change. Regardless of which one of the processing diameter and the back taper is adjusted first, what is adjusted earlier does not change when the latter is adjusted.
[0029]
In the present embodiment, the overhang surface 74 is formed along a plane including the central axis of the reamer body 10, and the upper surface 132 of the sheet 102 is slightly lowered from the plane including the central axis of the reamer body 10. The main cutting edge 160A and the sub-cutting edge 160B of the chip 100 are slightly raised from the upper surface thereof, so that the main cutting edge 160A and the sub-cutting edge 160B are positioned on the plane including the central axis of the reamer main body 10 exactly. Has been. However, the main cutting edge 160A and the auxiliary cutting edge 160B are positioned higher (upward) or lower (lowered) than the plane including the central axis of the reamer body 10. It is also possible to do.
[0030]
Furthermore, in the above-described embodiment, the radial receiving surface 80 is formed along the radius of the reamer 10, but may be formed slightly inclined with respect to the radial direction of the reamer 10. It is desirable that the outer peripheral side be inclined so as to be positioned closer to the front end side in the axial direction. By doing so, the radial side surface 130 of the seat 102 and the radial receiving surface 80 of the reamer body 10 can be brought into contact with each other on the outer peripheral side regardless of the adjustment state of the back taper.
[0031]
Furthermore, in the above-described embodiment, the reamer body 10 is integrally configured, and the sheet holding portion 72 is formed by electric discharge machining, but the member that forms the overhang portion is manufactured separately from the reamer body. After machining the seat mounting seat in the reamer main body, another member can be fixed to the reamer main body to form an overhang portion.
[0032]
In the above-described embodiment, the adjusting screw 150 provided on the sheet 102 is configured to contact the wedge member 104. However, as shown in FIG. 14, the wedge member 200 is formed short, and the adjusting screw 150 is axially disposed. You may make it contact | abut directly to the receiving surface 78. FIG. However, in this aspect, when the back taper is adjusted first, the back taper changes when adjusting in the radial direction, so it is desirable to adjust the radius first.
[0033]
Still another embodiment will be described. In this embodiment, the configuration of the reamer body is almost the same as that of the above embodiment, and the configuration of the adjusting device that adjusts the machining diameter and the back taper is different. Therefore, different parts will be described with reference to FIGS. .
[0034]
In the present embodiment, as shown in FIGS. 19 and 20, the third inclination that inclines toward the rear end portion of the upper surface 110 of the wedge member 300 toward the seat surface 76 of the sheet holding portion 72 toward the sheet 304 side. A surface 302 is formed. Further, instead of forming the female screw hole 148 penetrating the sheet 304 in the radial direction, a sheet-side inclined surface 306 that is inclined so as to face the third inclined surface 302 of the wedge member 300 is formed. Specifically, as shown in FIG. 20, the sheet-side inclined surface 306 is continuously formed on the upper surface 32 of the sheet 304, and is inclined in a direction away from the overhang surface 74 of the sheet holding portion 72 toward the inner side in the radial direction. ing. A female screw hole 308 is formed in the overhang portion 90 so as to pass through in a direction orthogonal to the overhang surface 74 at a position facing the third inclined surface 302 and the seat-side inclined surface 306, and an adjustment screw 310 is screwed into the female screw hole 308. The female screw hole 308 is formed slightly eccentric on the sheet-side inclined surface 306 side. When the adjusting screw 310 is rotated and protruded from the overhang portion 90 into the sheet holding portion 72, the third inclined surface 302 is contacted. The back taper of the chip 100 can be reduced by being brought into contact with the sheet-side inclined surface 306 in a non-contact state and pushing the vicinity of the rear end portion of the sheet 304 outward. The third inclined surface 302 is formed as a bevel for preventing the wedge member 300 from interfering with the adjusting screw 310, and instead of forming the third inclined surface 302, the axial length of the wedge member 300 is increased. It is good also as forming short and not interfering with the adjustment screw 310.
[0035]
In the present embodiment, a tapered surface is formed at the tip of the adjusting screw 310, and the back taper of the chip 100 is adjusted by directly contacting the sheet-side inclined surface 306 at the tapered surface. On the other hand, an adjusting piece having an inclined surface that is inclined along the seat-side inclined surface 306 is provided, an adjusting screw is disposed outside the adjusting piece, and the axial position of the adjusting piece is defined by the adjusting screw to thereby adjust the chip 100. The back taper may be adjusted. By doing so, the inclined surface of the adjusting piece comes into surface contact with the seat-side inclined surface 306, and the contact area is increased as compared with the case where contact is made with the tapered surface, so that the holding rigidity is improved.
[0036]
In the present embodiment, no moving means for moving the wedge member 300 forward in the axial direction is provided, but axial forward moving means may be formed as described below.
[0037]
Still another embodiment will be described.
The reamer 400 is substantially the same as that of the above-described embodiment. However, since the adjustment member for adjusting the back taper is different, only the configuration of different parts will be described in detail.
As shown in FIGS. 21 to 23, the second inclined surface 114 is not formed in this embodiment as well. Instead, as an adjustment mechanism for moving the wedge member 402 forward in the axial direction, a tapered hole 404 is formed at the center of the upper surface 110 of the wedge member 402, and a female screw hole 405 is formed at a position opposite to that of the overhang portion 90. Has been. The female screw hole 405 is formed eccentrically forward of the tapered hole 404 in the axial direction. As shown in FIG. 23, an adjusting screw 406 having a tapered portion at the tip is screwed into the female screw hole 405, and the tapered portion is eccentrically brought into contact with the tapered hole 404, thereby moving the wedge member 402 forward in the axial direction. be able to.
Note that a mechanism for moving the wedge member 402 axially forward is not essential.
[0038]
Further, in the present embodiment, the wedge member 402 is formed so as to come into contact with the axial side surface 128 of the sheet 304 while being in contact with the axial receiving surface 78 of the sheet holding portion 72. Has been. The wedge member 402 is brought into contact with the axial receiving surface 78 in the vicinity of the distal end portion of the axial side surface 106, and the gap between the axial side surface 106 and the axial receiving surface 78 becomes larger toward the rear in the axial direction. It is arranged in. Here, a relief portion 410 is formed at the tip of the axial receiving surface 78 so that the wedge member 402 is sandwiched between the sheet holding portion 72 and the sheet 304 by a portion located in the vicinity of the main cutting edge of the chip 100 in the axial direction. Has been. A portion of the axial receiving surface that is located at the tip of the sheet 304 is formed deeper in the radial direction than the other portion, and is formed so as not to contact the axial side surface 106 of the wedge member 402. As a result, it is possible to avoid a gap from being generated inside the tip portion of the chip 100.
[0039]
A fourth inclined surface 412 is formed on the base end side in the axial direction of the wedge member 402 so as to face the axial receiving surface 78 of the sheet holding portion 72. A fourth female screw hole 414 is formed in parallel with the first female screw hole 116 at a position of the reamer body facing the fourth inclined surface 412. The fourth female screw hole 414 is formed to have a length that passes through the overhang portion 90 and reaches the seat surface 76 of the sheet holding portion 72. A back taper adjusting screw 416 is screwed into the fourth female screw hole 414. When the taper surface of the back taper adjusting screw 416 contacts the fourth inclined surface 412, the back taper of the seat 304 and the chip 100 is adjusted. In this state, the fourth female screw hole 414 is formed sufficiently deep so that it does not interfere with the axial movement of the back taper adjustment screw 416. Actually, only the inclined surface 412 of the sheet 304 is in contact with the tapered surface of the back taper adjusting screw 416. The fourth inclined surface 412 is formed such that its extending direction is parallel to the extending direction of the axial receiving surface 78 of the sheet holding portion 72. This makes it possible to adjust the machining diameter and the back taper completely independently.
[0040]
In the present embodiment, similarly to the above-described embodiment, instead of providing the back taper adjusting screw 416, the back taper may be adjusted by combining an adjusting piece and an adjusting screw.
[0041]
Although some embodiments of the present invention have been described above, these are merely examples, and the present invention is an aspect described in the above section [Problems to be Solved by the Invention, Problem Solving Means and Effects of the Invention]. And various other modifications and improvements can be made based on the knowledge of those skilled in the art.
[0042]
[Brief description of the drawings]
FIG. 1 is a front view showing a reamer body of a throw-away reamer according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a side view of the reamer main body shown in FIG.
4 is an enlarged front view showing a main part of FIG.
FIG. 5 is a front view showing a wedge member of the throw-away reamer.
6 is a view on arrow A in FIG. 5;
FIG. 7 is another side view showing the main part of the throw-away reamer.
FIG. 8 is a front view showing a seat of the throw-away reamer.
FIG. 9 is a side view of the seat in FIG.
FIG. 10 is a side view showing a state where the throw-away reamer is assembled.
FIG. 11 is another side view showing a part extracted from FIG. 10;
12 is an enlarged front sectional view showing a main part of the reamer in FIG.
13 is a side cross-sectional view showing an essential part of FIG.
FIG. 14 is a front sectional view showing, in an enlarged manner, main portions of a throw-away reamer that is another embodiment of the present invention.
FIG. 15 is a front view showing a throw-away reamer that is still another embodiment.
FIG. 16 is a front view showing a wedge member extracted from the reamer.
FIG. 17 is a side view of the wedge member shown in FIG.
FIG. 18 is another side view of the wedge member shown in FIG.
FIG. 19 is a front view showing a main part extracted from the reamer.
20 is a cross-sectional view taken along the line XX-XX in FIG.
FIG. 21 is a front view showing a throw-away reamer that is still another embodiment.
FIG. 22 is an enlarged front sectional view showing the main part of the reamer.
23 is a cross-sectional view taken along the line XXIII-XXIII in FIG.
[Explanation of symbols]
90: Overhang portion 100: Throw away tip 102: Seat 104: Wedge member 112: First inclined surface 114: Second inclined surface 120: First adjusting screw 126: Second adjusting screw

Claims (8)

A throw-away reamer formed by detachably attaching a throw-away tip having a polygonal flat plate shape to the reamer body,
Each flat surface has a flat bottom surface and two side surfaces, and is a flat surface in close contact with the first seating surface and the two side surfaces of the throw-away tip that are in close contact with the bottom surface of the throw-away tip. A seat with a first mounting seat having two first receiving surfaces;
A second mounting seat having a second seating surface and two second receiving surfaces corresponding to the bottom surface and two side surfaces of the seat, respectively, and the two second receiving surfaces are respectively (a) radial direction of the reamer A radial receiving surface that abuts one of the two side surfaces of the sheet to define an axial position of the sheet; and (b) extends substantially in the axial direction of the reamer and the two side surfaces of the sheet. A reamer body that is an axially receiving surface that forms a wedge-shaped gap in which the gap increases with the other end of the reamer,
Inserted in the wedge-shaped gap, and sandwiched by a portion of the axial receiving surface and the other side surface of the sheet opposite to the axial receiving surface located at the same position as the main cutting edge of the throw-away tip in the axial direction of the reamer. A wedge member;
A first adjusting device for adjusting an insertion depth of the wedge member into the wedge-shaped gap;
Adjusting a gap between the axial receiving surface and the other side surface of the sheet facing the axial portion of the reamer in the axial direction of the reamer from the main cutting edge of the throwaway tip toward the proximal end side of the reamer A second adjusting device to
With the throwaway tip received in the first mounting seat and the seat received in the second mounting seat, the throwaway tip is attached to the radial receiving surface, the axial receiving surface, and the throwaway tip, respectively. A clamping device for clamping a throw-away tip and a seat to the reamer body, applying a clamping force in a direction to approach the second seating surface, and tilting the axial receiving surface of the reamer body with respect to the axial direction of the reamer A throw-away reamer characterized in that a corner is equal to or less than a wedge angle of the wedge member. As the throw-away tip, used is one in which a clamp hole having a tapered inner peripheral surface having a larger diameter is formed toward the surface side while penetrating the center portion in the thickness direction,
The clamping device is
A through hole formed in a portion of the first seat surface of the seat corresponding to a clamp hole of the throw-away tip;
A female screw hole formed in the second bearing surface of the reamer body;
A male screw part is provided at the tip part, and a taper outer peripheral surface corresponding to the taper inner peripheral surface of the throwaway tip is provided at the end part, and the male screw part passes through the clamp hole of the throwaway tip and the through hole of the seat. When the outer peripheral surface of the taper is engaged with the female screw hole and the tapered outer peripheral surface is engaged with the tapered inner peripheral surface in an eccentric state, the throwaway tip is attached to the throwaway tip in the radial direction receiving surface, the axial direction receiving surface, and the second seat. A clamp screw that applies a clamping force in a direction to approach the surface, and the position of the female screw hole of the reamer body is relative to the clamp hole of the throw-away tip in a state of being clamped by the clamp screw. The throw-away reamer according to claim 1, wherein the throw-away reamer is eccentric in a direction approaching the direction receiving surface and the axial direction receiving surface. The first adjusting device comprises:
A first inclined surface formed at an end of the wedge member on the distal end side of the reamer and inclined to approach the second seat surface as it goes toward the distal end side of the reamer;
A female screw hole formed at a right angle to the second seat surface in an overhang portion provided in a state of covering the second seat surface on the reamer body,
A first adjustment that is screwed into the female screw hole and engages with the first inclined surface of the wedge member at the tapered outer peripheral surface formed at the tip, and pushes the wedge member from the larger side of the wedge-shaped gap toward the smaller side. The throw-away reamer according to claim 1 or 2, comprising a screw. The second adjusting device comprises:
The wedge member extends in a direction parallel to the side surface of the wedge member on the axial receiving surface side of the wedge member in the axial direction of the reamer from the main cutting edge of the throw-away tip toward the proximal end side of the reamer. And a second inclined surface formed by inclining in a direction closer to the second seat surface as it approaches the side surface on the axial receiving surface side,
A female screw hole formed at a right angle to the second seat surface in an overhang portion provided in a state of covering the second seat surface on the reamer body,
A second adjustment screw screwed into the female screw hole;
The reamer body is provided with an inclined surface that is movably held in a direction perpendicular to the second seating surface and corresponds to the second inclined surface of the wedge member, and the inclined surface is the second adjustment screw of the second adjustment screw. 4. The apparatus according to claim 1, further comprising: an adjustment member that pushes the wedge member and the seat toward the outer peripheral side of the reamer body by being pressed against the second inclined surface as the seat surface moves. Throw away reamer as described in. The second adjusting device comprises:
A female screw hole formed through the sheet in a direction parallel to the bottom surface of the sheet and a side surface received by the radial receiving surface of the sheet;
4. A second adjusting screw that is screwed into the female screw hole and that abuts the wedge member at the tip or directly against the axial receiving surface to push the sheet away from the axial receiving surface. The throwaway reamer according to any one of the above. The second adjusting device comprises:
The side of the sheet on the side of the wedge member on the portion of the sheet that is separated from the main cutting edge of the throw-away tip in the axial direction of the reamer toward the proximal end of the reamer and that faces the wedge member And a second inclined surface formed to be inclined toward the second seat surface as it approaches the side surface on the wedge member side,
A female screw hole formed at a right angle to the second seat surface in an overhang portion provided in a state of covering the second seat surface on the reamer body,
A second adjustment screw screwed into the female screw hole;
The reamer body is held so as to be movable in a direction perpendicular to the second seating surface, has an inclined surface corresponding to the second inclined surface of the seat, and is pressed against the second inclined surface by the second adjusting screw. The throw-away reamer according to any one of claims 1 to 3, further comprising an adjustment member that pushes the seat in a direction away from the axial receiving surface. A groove extending in parallel to the central axis of the reamer body on the outer peripheral surface of the columnar portion of the reamer body, the first side wall surface and the second side wall surface being parallel to each other, and the cross-sectional shape is rectangular. A cutting plane in which a groove is formed and a portion of the first side wall forming the first side wall surface on the outer peripheral side of the columnar portion is parallel to the axial direction of the columnar portion and perpendicular to the first side wall surface the excised, throw-away reamer according to any one of the first claim remaining portion of the side wall is to the overhang 3, 4 and 6. Provided on the outer peripheral surface of the columnar portion of the reamer body in a state of projecting radially outward from the outer peripheral surface, and in contact with the inner peripheral surface of the hole to be machined processed by the throw-away reamer, The throw-away reamer according to any one of claims 1 to 7, further comprising a guide pad for keeping the away reamer and the hole to be processed concentrically.

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