JP2002126946A - Throw away reamer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw away reamer capable of adjusting both a processing diameter and a back taper with a simple configuration. SOLUTION: A wedge member 104 is disposed between a seat 102 for retaining a tip 100 and a seat retaining section 72 of this reamer 10, and the wedge member is axially inserted in the vicinity of the main blade of the tip by the seat and the seat retaining section. By adjusting the axial position of the wedge member, the processing diameter is adjusted. An adjusting screw 150 is provided by penetrating the seat, and a front end 152 of the adjusting screw is allowed to abut to the wedge member to adjust a clearance between the wedge member and the seat, thus adjusting the back taper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throwaway reamer in which a throwaway tip is detachably attached to a reamer body.

[0002]

2. Description of the Related Art A throwaway reamer (hereinafter abbreviated as a reamer unless otherwise required) is disclosed in, for example,
No. 166419, Japanese Patent Publication No. 1-23251, and the like. In this type of reamer, a polygonal plate-like indexable insert is used in a state in which 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 axis of the reamer (referred to as the reamer axis) to the minor cutting edge. The minor cutting edge approaches the reamer axis by a small amount from the distal end to the proximal end of the reamer. Often tilted. A so-called back taper is provided. In this case, the processing diameter of the reamer is determined by the distance from the reamer axis of the end of the sub cutting edge closest to the main cutting edge.

[0003] In a throw-away reamer, the processing diameter is often adjustable, and it is desirable that the back taper is also adjustable. On the other hand, in the case of indexable reamers, how to fix the indexable insert firmly to the reamer body is an important issue.It is easy to adjust both the processing diameter and the back taper while satisfying this requirement. is not. It is desirable that the adjustment of the processing diameter and the adjustment of the back taper can be performed independently without affecting each other, but this is not easy.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a throwaway reamer capable of firmly fixing a throwaway tip to a reamer main body, having a simple structure. It is an object of the present invention to provide a tool capable of adjusting both the processing diameter and the back taper. According to the present invention, the following throw-away reamers can be obtained. As in the case of the claims, each aspect is divided into sections, each section is numbered, and if necessary, the other sections are cited in a form in which the numbers are cited. this is,
This is merely for the purpose of facilitating the understanding of the present invention, and the technical features and combinations thereof described in this specification should not be construed as being limited to those described in the following sections. Further, when a plurality of items are described in one section, the plurality of items need not always be adopted together. It is also possible to select and adopt only some of the items.

(1) A throw-away reamer in which a generally polygonal plate-shaped throw-away tip is detachably attached to a reamer main body, and has a substantially flat bottom surface and two side surfaces. And a first seat having a first seating surface, which is a plane that is in close contact with the bottom surface of the throw-away tip, and two first receiving surfaces, which are planes that are in close contact with the two side surfaces of the throw-away tip, respectively. Provided seats and second seating surfaces and 2 respectively corresponding to the bottom surface and the two side surfaces of the seat.
A second mounting seat having two second receiving surfaces, each of the two second receiving surfaces (a) extending substantially radially of the reamer;
A radial bearing surface that abuts one of the two side surfaces of the sheet to define the axial position of the sheet; and (b) extends substantially in the axial direction of the reamer and the other of the two side surfaces of the sheet. The reamer body, which is an axial receiving surface forming a wedge-shaped gap in which the gap is larger toward the distal end side of the reamer, and the reamer main body, which is inserted into the wedge-shaped gap, has the axial direction receiving surface and the sheet opposed thereto. A wedge member sandwiched by a portion of one of the two side surfaces and located near the main cutting edge of the indexable insert in the axial direction of the reamer, and an insertion depth of the wedge member into the wedge-shaped gap is adjusted. A first adjusting device and a proximal end of the reamer from the main cutting edge of the indexable insert in the axial direction of the reamer, the axial receiving surface and one of the two side surfaces of the sheet facing the first adjusting device; A second adjusting device for adjusting the gap between the off-side portions, and the throw-away tip in the first mounting seat, and the seat being received in the second mounting seat, the throw-away tip. A clamping device for applying a clamping force in a direction to bring the throw-away tip closer to the radial receiving surface, the axial receiving surface, and the second seating surface, and clamping the throw-away tip and the seat to the reamer body. A throwaway reamer characterized by the above-mentioned. In the present throwaway reamer, the throwaway tip has its bottom surface and two side surfaces connected to the first seating surface of the first mounting seat of the seat.
The sheet is received in a state of being in close contact with the two first receiving surfaces, and the sheet is received by the second mounting seat of the reamer body. The bottom of the seat is in close contact with the second seat surface of the second mounting seat,
One of the two side faces is received directly on the radial receiving surface of the second mounting seat, while the other of the two side faces is received on the axial receiving surface of the second mounting seat via a wedge member. Due to the necessity of adjusting the back taper, one of the two sides of the sheet does not completely adhere to the radial receiving surface, and the other side of the sheet also has a wedge member completely in contact with the axial receiving surface. It is not 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 that the angle between the planes in contact with each other can be small, and it is considered that they come into contact on a substantially wide surface. It will be in a safe state. Therefore, the support rigidity of the sheet by the reamer main body can be sufficiently increased. Since the throw-away chip is supported on the sheet with high support rigidity due to the close contact state of the three pairs of planes, the support rigidity of the throw-away chip by the reamer body can be sufficiently increased. In addition, the wedge member is inserted into the wedge-shaped gap, and is formed between the axial receiving surface and the side surface of the sheet opposed thereto.
In the axial direction of the reamer, it is sandwiched by the portions located near the main cutting edge of the throw-away tip, in which the seat is rotated along the second seating surface of the second mounting seat to adjust the back taper. It doesn't change. In addition, since the rotation angle for adjusting the back taper of the sheet is small, the straight line connecting the contact point of the sheet with the wedge member and the end of the main cutting edge of the sub-cutting edge is perpendicular to the axis of the reamer. The change in the processing diameter due to the inclination of the straight line can be neglected.
Therefore, even if the back taper is adjusted after the adjustment of the processing diameter, the processing diameter does not change due to the adjustment. The second adjusting device is interposed between the axial receiving surface and the side surface of the sheet facing the portion, which are separated from the main cutting edge of the throw-away tip toward the base end of the reamer in the axial direction of the reamer. Then, it is desirable to adjust the gap between the two parts, but by interposing between the other parts and adjusting the gap between the other parts, it is consequently possible to adjust the gap between the two parts. The gap may be adjusted. For example, the radial receiving surface is formed only on the outer peripheral side of the reamer main body, and between the inner peripheral side portion of the reamer main body and the reamer main body, of the side surfaces abutting on the radial receiving surface of the throw away tip. By providing a second adjusting device for adjusting the gap between the two, as a result, the main cutting edge of the indexable insert in the axial direction of the reamer between the axial receiving surface and the side surface of the sheet facing the axial receiving surface. Alternatively, the gap between the parts deviating from the reamer toward the base end may be adjusted. (2) As the throw-away tip, a tip which penetrates a central portion in a thickness direction and has a clamp hole having a tapered inner peripheral surface having a larger diameter toward a front surface side is used. A through hole formed in a portion of the first seating surface corresponding to the clamp hole of the throw away tip, and a through hole formed in the second seating surface of the reamer body at a position substantially corresponding to the through hole of the seat. Female screw hole, a male screw part at the tip, and a tapered outer peripheral surface substantially corresponding to the tapered inner peripheral surface of the throw-away tip at the distal end, and the male screw part is provided with the through-hole between the throw-away tip and the sheet. The female screw hole is screwed into the female screw hole, and the tapered outer peripheral surface is eccentrically engaged with the tapered inner peripheral surface. Toward the receiving surface, said axial receiving surface and the second is close to the seating surface and a clamping screw to apply a clamping force in a direction (1) throw-away reamer according to claim (Claim 2). (3) A throw-away tip having a generally polygonal flat plate shape, and having a clamp hole penetrating the center portion in the thickness direction and having a tapered inner peripheral surface having a larger diameter toward the front side,
A throwaway reamer detachably attached to a reamer main body, the bottom surface being a plane and the bottom being a reamer.
A first seating surface, which is a flat plate having two side surfaces and is a flat surface that is in close contact with the bottom surface of the throw-away tip, and two first receiving surfaces that are two flat surfaces that are in close contact with the two side surfaces of the throw-away tip, respectively. A seat having a first mounting seat provided with a through hole at a position corresponding to a clamp hole of the throw-away tip on the first seat surface, and a bottom surface and two side surfaces of the seat. A second mounting seat having a corresponding second seat surface and two second receiving surfaces is formed, and each of the two second receiving surfaces is (a)
A radial receiving surface extending substantially radially of the reamer and defining an axial position of the seat by contacting one of two side surfaces of the sheet; and (b) the seat extending substantially axially of the reamer. Between the other of the two side surfaces of the reamer is an axial receiving surface that forms a wedge-shaped gap in which the gap increases toward the tip end of the reamer, and substantially corresponds to the through hole of the seat in the second seating surface. A reamer main body having a female screw hole formed at a position thereof, and the thrower inserted in the wedge-shaped gap, at least the axial direction receiving surface and the other of the two side surfaces of the sheet facing the axial direction receiving surface in the axial direction of the reamer. A wedge member sandwiched between portions located near the main cutting edge of the away tip, a first adjusting device for adjusting the insertion depth of the wedge member into the wedge-shaped gap, the axial receiving surface and A second adjusting device that adjusts a gap between the other of the two side surfaces of the opposed sheet and a portion of the main insert blade of the throw-away tip deviated from the main cutting edge toward the base end of the reamer in the axial direction of the reamer; A male screw portion at the tip, a tapered outer peripheral surface corresponding to the tapered inner peripheral surface at the distal end, and the male screw portion is screwed into the female screw hole through the through hole of the throwaway tip and the sheet, The tapered outer peripheral surface is eccentrically engaged with the tapered inner peripheral surface, so that the throw away tip is brought closer to the radial receiving surface, the axial receiving surface and the second seating surface. Apply clamping force,
A throw-away tip and a clamp screw for clamping a sheet to the reamer body. (4) The indexable insert is positioned on the first mounting seat by the first seat surface and the two first receiving surfaces, and the seat is positioned on the second seat surface, the radial receiving surface, and the axial receiving surface. With the female screw hole of the second seating surface positioned relative to the second mounting seat, the female screw hole of the second seating surface is positioned closer to both the radial receiving surface and the axial receiving surface with respect to the through hole of the throw-away tip. The throw-away reamer according to the above mode (2) or (3), which is formed at an eccentric position. When the male screw portion of the clamp screw is screwed into the eccentric female screw hole and tightened as described above, the tapered outer peripheral surface of the clamp screw engages eccentrically with the tapered inner peripheral surface of the through hole of the throw-away tip, and the throw is performed. The away tip will be pushed towards 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 on the radial receiving surface of the reamer body and via the wedge member on the axial receiving surface. Thus, the throw-away tip can be received more firmly by the reamer body. (5) The first adjusting device is formed at the end of the wedge member on the tip side of the reamer so as to be inclined toward the second seating surface toward the tip side of the reamer. An inclined surface, an overhang portion provided on the reamer body so as to cover the second seating surface, a female screw hole formed substantially perpendicular to the second seating surface, and screwed into the female screw hole; A first adjusting screw that engages with the first inclined surface of the wedge member at the tapered outer peripheral surface formed therein and pushes the wedge member inward of the wedge-shaped gap. (1) to (4). The throw away reamer according to any one of claims 1 to 4. If the first adjusting screw is screwed into the female screw hole of the overhang portion, its tapered outer peripheral surface acts on the first inclined surface of the wedge member to push the wedge member inward of the wedge-shaped gap, so that the wedge member has The wider portion is sandwiched between the sheet and the axial receiving surface of the reamer body, so that the distance from the reamer axis of the sub cutting edge of the indexable insert increases, and the machining diameter increases. Conversely, if the first adjusting screw is loosened, the wedge member is allowed to move outward from the wedge-shaped gap, and the processing diameter can be reduced. An adjustment piece having an inclined surface corresponding to the first inclined surface of the wedge member is held on the overhang portion so as to be movable in a direction substantially perpendicular to the second seating surface, and the adjusting piece is approached to the second seating surface by an adjusting screw. It is possible to push the wedge member inward of the wedge-shaped gap by pressing the wedge member in the direction in which the wedge member is formed. Pressing against an inclined surface simplifies the configuration and is sufficient. Even if the cutting resistance force acting on the indexable insert is transmitted to the wedge member through 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. It does not need to be done, and line contact between the two is sufficient. (6) The second adjusting device is provided on the portion of the wedge member that is displaced from the main cutting edge of the throw-away tip toward the base end of the reamer in the axial direction of the reamer, and receives the wedge member in the axial direction. A second inclined surface that extends in parallel to the side surface on the surface side, and is formed to be inclined in a direction closer to the second seat surface as approaching the side surface on the axial direction receiving surface side, and the reamer main body, In the overhang portion provided so as to cover the second seating surface, a female screw hole formed substantially at right angles to the second seating surface, a second adjusting screw screwed into the female screw hole, and the reamer main body. The wedge member is provided so as to be movable in a direction substantially perpendicular to the second seat surface, and has an inclined surface corresponding to the second inclined surface of the wedge member, and the inclined surface is directed toward the second seat surface of the second adjusting screw. Is pushed against the second slope with the movement of Ri, the wedge member and the sheet pushing toward the outer periphery of the reamer body and a regulating member (1) through (5) throw-away reamer according to any one of claims (claim 4). The “adjusting member” may be, for example, a tapered shaft formed integrally with the tip of the second adjusting screw. In this case, the adjusting member is formed 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 "adjustment member" may be an adjustment piece formed separately from the second adjustment 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 to the reamer main body in a fitting hole formed substantially perpendicular to the second seat surface. By being pushed from behind by the second adjusting screw, the wedge member is pressed against the second inclined surface. In any case,
The wedge member and the sheet are pushed to the outer peripheral side of the reamer body by the effect of the inclined surface, and the sub cutting edge of the throw-away tip is rotated by a small angle with respect to the reamer axis, so that the back taper is reduced. Conversely, if the second adjusting screw is loosened, rotation of the seat and the wedge member in the direction opposite to the above direction is allowed, and the back taper can be increased. According to the adjusting piece, the cutting resistance force acting on the throw-away tip can be reduced by the sheet and the wedge, since the adjusting piece can be brought into contact with the second inclined surface of the wedge member on a wider surface than in the case of the tapered shaft portion at the tip of the second adjusting screw. The reamer body can be firmly received via the member and the adjustment piece, and the holding rigidity of the indexable tip by the reamer body can be increased. On the other hand, in the case of using the tapered shaft portion at the tip of the second adjusting screw, there is an advantage that the configuration is simple. Since the second inclined surface extends parallel to 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 adjustment of the processing diameter, the throw away tip can be used. The back taper of the secondary cutting edge does not change. Further, as described above with respect to the above item (1), even if the back taper is adjusted after the adjustment of the processing diameter, the processing diameter does not change due to the adjustment of the back taper. The adjustment and the adjustment of the back taper can be performed independently of each other. (7) a female screw hole formed in the seat through the seat in a direction substantially parallel to the bottom surface of the seat and substantially perpendicular to the axial receiving surface;
A second adjusting screw that is screwed into the female screw hole and that comes into contact with the axial receiving surface at the tip end or directly with the axial receiving surface to push the sheet away from the axial receiving surface.
The throwaway reamer according to any one of paragraphs (1) to (5) (claim 5). In this embodiment in which the second adjusting screw is in contact with the axial receiving surface via the wedge member, even if the processing diameter is adjusted by adjusting the insertion amount 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 may be provided on a portion of the seat that is displaced from the main cutting edge of the throw-away tip toward a base end of the reamer in the axial direction of the reamer and that faces the wedge member. A second inclined surface extending parallel to the wedge member side surface of the seat and inclined so as to approach the second seat surface as approaching the wedge member side surface; and In the body, the overhang portion provided so as to cover the second bearing surface,
A female screw hole formed substantially perpendicular to the second seat surface, a second adjusting screw screwed into the female screw hole, and the reamer body movably held in a direction substantially perpendicular to the second seat surface, An adjusting member that has an inclined surface corresponding to the second inclined surface of the sheet and that pushes the sheet in a direction away from the axial receiving surface by being pressed against the second inclined surface by the second adjusting screw. The throw-away reamer according to any one of paragraphs (1) to (5) (claim 6). In this reamer, the processing diameter does not change even if the back taper is adjusted after the processing diameter is adjusted. However, if the processing 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. Further, in this aspect, the wedge member may be shortened so as not to interfere with the second adjustment screw, but instead of being shortened, a portion facing the second inclined surface has a shape that does not interfere with the second adjustment screw. It is desirable to be done. (9) The first adjusting device further includes a third wedge member formed at an end opposite to the side where the first inclined surface is formed, with an inclination opposite to the first inclined surface. An inclined surface, a female screw hole formed at a right angle to the second seating surface in the overhang portion of the reamer main body, and a third inclined surface which is screwed into the female screw hole and formed on a tapered outer peripheral surface formed at a tip end. The throw-away reamer according to any one of the above modes (5) to (8), including a third adjusting screw that engages with the surface and pushes the wedge member out of the wedge-shaped gap. (10) A groove having a generally rectangular cross section on the outer peripheral surface of the cylindrical portion of the reamer main body, the first side wall surface is located substantially on a plane including the central axis of the reamer main body, and the second side wall surface is provided. A groove extending parallel to the first side wall surface is formed, and a portion of the first side wall forming the first side wall surface on the outer peripheral side of the cylindrical upper portion is parallel to the axial direction of the cylindrical portion. The throw-away reamer according to any one of (5) to (9), wherein the overhang portion is cut off by a cutting plane substantially perpendicular to the first side wall surface, and the remaining portion of the first side wall is the overhang portion. Item 7). According to this aspect, the overhang portion can be easily formed on the reamer main body. The rectangular groove can be formed by, for example, electric discharge machining. (11) The throwaway 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 the present throw away reamer, a nearly square or rectangular tip is used as the throw away tip. A nearly square throwaway tip is 4
The vicinity of one vertex can be selectively used as a cutting edge. A substantially rectangular indexable insert may have the edge near two vertices. (13) The reamer is provided on the outer peripheral surface of the cylindrical portion of the reamer main body so as to protrude radially outward from the outer peripheral surface,
A guide pad is provided which is in contact with the inner peripheral surface of the hole to be machined by the throw away reamer and keeps the throw away reamer and the hole to be machined concentrically (1) to (12). The throw away reamer according to any one of claims 1 to 9 (claim 8). A throw-away reamer with a guide pad is known as a high-precision reamer,
If the present invention is applied to a throw-away reamer provided with this guide pad, the processing accuracy can be further improved, which is particularly effective. (14) The throw-away reamer according to the mode (13), wherein a plurality of the guide pads are provided so as to be circumferentially separated from each other. (15) The throw-away reamer according to the mode (13) or (14), wherein the guide pad extends parallel to an axial direction of the throw-away reamer.

[0006]

FIG. 1 shows a throwaway reamer (hereinafter simply referred to as a reamer) according to a first embodiment of the present invention. As shown, the reamer includes a reamer body 10 having a generally stepped shaft shape. Reamer body 10
Has a main body portion 12 extending in a cylindrical shape, and has a base end portion (a rear end portion, which is a right end in the figure).
The flange portion 14 is formed coaxially. The flange portion 14 extends radially outward from the outer peripheral surface of the main body portion 12 and has a large diameter. Flange part 14
Rear end face 1 on the opposite side to front end face 16 on the body portion 12 side
The fitting projection 20 extends from the position 8. Fitting projection 20
Is fitted in a fitting hole of an adapter (not shown), and the rear end face 18 of the flange portion 14 is brought into contact with the tip face of the adapter, so that the position of the reamer body 10 in the radial and axial directions with respect to the adapter is adjusted. Is determined.
Bolt holes 3 penetrating the flange portion 14 in the axial direction
While a plurality of 0s are formed at equal angular intervals, a female screw hole is formed in a portion corresponding to the bolt hole 30 on the distal end surface of the adapter.
By being screwed into the female screw hole through 0, the reamer main 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.

The main body 12 has a shank 40 having a relatively large diameter and a body 42 having a relatively small diameter. A shank 40 is formed to extend in the axial direction from the front end face 16 of the flange portion 14, and a body 42 is formed from the front end of the shank 40.
Are coaxially extended. As shown in FIG. 2, a part of the outer periphery of the shank 40 is cut off along a plane parallel to the axial direction, and the part is used for rotation balance (by forming a groove 84 and the like for chip discharge described later). A flattening portion 46 (for eliminating rotational imbalance of the reamer body 10) is formed. From the rear end face 47 of the fitting projection 20 to the body 4
The coolant hole 48 is formed continuously to the middle of Step 2. A plurality of communication holes 50 are formed near the tip of the coolant hole 48 to communicate the coolant hole 48 with the outer periphery of the body 42. The communication hole 50 is formed so as to be inclined such that it is located closer to the outer periphery as it approaches the distal end.

A tip holding portion 60 for holding 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 later in detail. As shown in FIG. 3, the chip holding portion 60 is formed to have a size occupying about one-fourth of the outer circumference of the guide portion. This reamer is a single-blade reamer in which one tip holding portion 60 is formed. A plurality of guide pads 62 are provided on the outer periphery near the tip of the body 42 except for the chip holding portion 60. Specifically, a plurality of grooves 64 extending in the axial direction are formed on the outer periphery of the body 42, and the guide pads 62 are fitted and fixed in the grooves 64, respectively. The depth of the groove 64 is smaller than the thickness of the guide pad 62, and the guide pad 62 is provided to slightly protrude from the body 42 in the radial direction. The coolant outlet 66, which is the outer peripheral opening of each of the communication passages 50, is formed at a different phase position from those of the guide pads 62.

The chip holding section 60 is provided with a sheet 10 to be described later.
2 is provided. The sheet holding portion 72 is formed in a rectangular groove shape extending in the axial direction.
A first side wall surface 74 of the rectangular groove is located substantially on a plane including the central axis of the reamer main body, and a second side wall surface 76 is formed parallel to the first side wall surface 74. Then, the second side wall surface 76 functions as a seat surface on which a bottom surface of the seat 102 described later sits, and the first side wall surface 74 functions as an overhang surface that covers the seat surface. Therefore, the second side wall surface 7
6 is referred to as a seat surface 76 and the first side wall surface 74 is referred to as an overhang surface 74. The sheet holding portion 72 is further defined by a bottom surface 78 and an end surface 80 of the rectangular groove, as shown in FIG. 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 for receiving 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.

The rectangular groove is formed so as to be deeper toward the tip end of the body 42, and an axial receiving surface 78 as a 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). The end surface of the rectangular groove is a stepped surface, and the outer peripheral portion of the body 42 is located closer to the distal end of the body 42 than the center portion. Therefore, the portion that functions as the radial receiving surface 80 is the portion of the end surface that is the stepped surface on the outer peripheral side of the body, and the portion of the end surface that is on the inner peripheral side of the body functions as the relief portion 82. The axial receiving surface 78 and the radial receiving surface 80 form an obtuse angle with each other, and are orthogonal to the seating surfaces 76 and the overhanging surfaces 74 located on both sides. The seat holding portion 72 configured as described above can be formed by, for example, electric discharge machining, and includes the seat surface 76 and the axial receiving surface 78.
The surface roughness of the radial receiving surface 80 is desirably reduced by lapping or the like.

A groove 8 is formed in the front of the sheet holding portion 72 in the circumferential direction.
4 are formed. The bottom surface 86 of the groove 84 is connected to the seat surface 7.
6 and the overhang surface 74.
The groove 84 is formed shallower than the rectangular groove forming the sheet holding portion 72, and has a depth approximately half in the illustrated example. The groove 84 is formed to be 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 overhang surface 74 of the sheet holding portion 72 is formed at a height reaching 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 overhang surface 74 so as to be orthogonal to the overhang surface 74. The groove 84 is formed in a V-shaped groove by a bottom surface 86 and a side surface 88 parallel to the overhang surface 74, and the side surface 88 is formed slightly closer to the seat surface 76 than the overhang surface 74. The portion defined by the overhanging surface 74 of the seat holding portion 72 and the bottom surface 86 of the groove 84 forms the seat surface 7 when viewed from a direction perpendicular to the seat surface 76.
6 is an overhang portion 90 that covers. In addition, the overhang surface 74 and the side surface 88 may be slightly inclined to each other.

The chip 100 is mounted on the reamer body configured as described above. Chip 100 is sheet 10
2, the wedge member 104 is fixed between the sheet 102 and the sheet holding portion 72 by being fixed to the sheet holding portion 72 of the reamer main body.

As shown in FIGS. 5 and 6, the wedge member 104 has a generally rod-like 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 the inclination of the axial receiving surface 78 of the seat holding portion 72 with respect to the axial direction of the body 42. The angle is the same. A wedge-shaped gap is formed between the axial receiving surface 78 and a side surface (an axial side surface 128 described later) of the sheet 102 facing the axial direction receiving surface 78, and the wedge-shaped gap is formed in the wedge-shaped gap. Is inserted, but the wedge angle of the wedge member 104 is the same as the wedge angle of the wedge-shaped gap. Then, the side surface 106 of the wedge member 104 is in close contact with the axial receiving surface 78, and the axial side surface 1 of the sheet 102 is
The side surface (the radial side surface 130, described later) of the sheet 102 that faces the radial receiving surface 80 is in close contact with the radial receiving surface 80 in a state in which the 28 is in close contact with the side surface 108 of the wedge member 104. I have. 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.

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 has the wedge member 10 attached thereto.
4, two inclined surfaces 112 and 114 are formed at both ends in the longitudinal direction. One of the two inclined surfaces 112, 114 is formed at the axial end portion of the upper surface 110, which is the end of the body 42 on the distal end side. 72 are inclined so as to approach the seating surface 76. The second inclined surface 114, which is the other of the two inclined surfaces, is formed at the rear end in the axial direction of the wedge member 104, and is inclined so as to approach the seat surface 76 toward the rear end in the axial direction. Each surface of the wedge member 104 has a lapping finish and is formed with high precision.

As shown in FIG. 7, the tip of the overhang portion 90 of the reamer main body near the tip of the body 42 has a direction perpendicular to the seat surface 76 (a direction perpendicular to the upper surface 110 of the wedge member 104). A first female screw hole 116 is formed through the overhang 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 on the sheet holding portion 72. A first adjusting 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 the tip end which is the end opposite to the wedge member 104 (see FIG. 11), and the inclination angle of the first adjustment screw 120 is the first inclination of the wedge member 104. It is formed the same as the surface 112. 1st adjusting screw 1
Although not shown, a hexagonal hole for engaging a hexagonal bar wrench as a rotary tool is formed on the rear end surface of 20. The overhang portion 90 further has a second female screw hole 124 formed at the rear end thereof in parallel with the first female screw hole 116. The second female screw hole 124 is formed at a position facing the second inclined surface 114, and a second adjusting screw 126 similar to the first adjusting screw 120 is screwed therein. These first and second inclined surfaces 112, 114 and two adjusting screws 120,
With 126, the axial position of the wedge member 104 with respect to the sheet holding portion 72 can be adjusted (see FIG. 12). The adjustment operation will be described later in detail.

In the sheet holding section 72, the wedge member 1
The seat 102 is disposed radially outward of the sheet 04. FIG.
As shown in FIG. 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, which is 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.

The chip 10 is placed on the upper surface 132 of the sheet 102.
A chip seat 134 holding 0 is formed. 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 seat surface 142 parallel to the upper surface 132. I have. When the chip 100 is held, the axial receiving surface 136 and the radial receiving surface 138
It is formed so that the back taper of 0 is about 1 degree. Specifically, when the sheet 102 is placed on the sheet holding portion 72, the axial direction receiving surface 136 is inclined by about 1 degree so that the distal end side is located more radially outward, and the radial direction receiving surface 138 is It is inclined about 1 degree so that the inner side in the radial direction is located forward in the axial direction.
A clearance 144 is formed between the axial receiving surface 136 and the radial receiving surface 138. The axial receiving surface 136 and the radial receiving surface 138 are inclined in accordance with the clearance angle of the chip 100. The tip seat 134 is formed slightly smaller than the size of the tip 100 described later.
The chip 100 is fixed in such a manner as to slightly protrude from the sheet 102 in the circumferential direction, the axial direction, and the radial direction of the body 42. In other words, the chip seat 134 is formed to be slightly shallower than the thickness of the chip 100, and the axial receiving surface 136 and the radial receiving surface 138 are each slightly smaller than the vertical and horizontal lengths of the chip 100. is there. The seat 10 is positioned at the center of the seat surface 142 in a direction orthogonal to the seat surface 142.
2, a through hole 146 is formed.

Further, the rear end of the sheet 102 (body 4
At the base end of the sheet 102), a female screw hole 148 is formed to penetrate the sheet 102 in a direction parallel to the bottom surface 147 of the sheet 102 and perpendicular to the axial side surface 128. The female screw hole 148 is formed at a position that does not interfere with the chip seat 134. An adjusting screw 150 is screwed into the female screw hole 148 from the outer peripheral side surface of the sheet 102, and an end surface 152 of the adjusting screw 150 projects from the inner opening of the female screw hole 148 and abuts on the wedge member 104.
The size of the gap 129 between the sheet 102 and the wedge member 104 can be adjusted. An 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 configured to come into contact with the wedge member 104 substantially on the axis. The adjusting screw 150 is provided in the female screw hole 14.
8 so as not to protrude from the outer peripheral side surface of the sheet 102.

The chip 100 is accommodated in the chip seat 134 of the sheet 102. The chip 100 has a generally square plate shape, and each of the four sides of the square has a cutting edge 16.
0 is formed. A through hole 161 is formed at the center of the chip 100 so as to penetrate the chip 100 in the thickness direction. As shown in FIG. 13, a portion of the through hole 161 on the upper surface 132 side has a tapered inner peripheral surface 162 having a larger diameter toward the upper surface 132 side.
And a tapered hole having A female screw hole 164 is formed in the seating surface 76 of the seat holding portion 72 of the body 42, and the female screw hole 164 is axially received in the through hole 161 of the chip 100 and the through hole 146 of the seat 102. It is formed at an eccentric position so as to approach both the surface 78 and the radial receiving surface 80. Therefore, the clamp screw 168 having the tapered outer peripheral surface 166 on 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
00 is eccentrically engaged with the tapered inner peripheral surface 162, the chip 100 is pressed against the two receiving surfaces 136, 138, and the sheet 102 is directly wedge on the radial receiving surface 80 and wedge on the axial receiving surface 78. The chip 100 is pressed indirectly via the member 104, and as a result, the chip 100 is positioned and fixed to the body 42.

In the reamer configured as described above, of the four cutting edges 160 of the tip 100, the body 4
2 is a main cutting edge 160A, and a cutting edge 160 located on the outer peripheral side of the body 42 is a sub cutting edge 160A.
Functions as B. The minor cutting edge 160B is inclined by a small 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. Since the back taper is provided, the processing diameter of the reamer is determined by the distance of the end of the sub cutting edge 160B on the main cutting edge 160A side from the center axis of the body 42, that is, the rotation axis of the reamer. Hereinafter, the adjustment of the processing diameter and the back taper will be described with reference to FIG. However, FIG. 12 shows a state in which the overhang portion 90 is removed for easy understanding.

First, the wedge member 1 is placed in the sheet holding portion 72.
04 is provided. In this state, the wedge member 104
First and second adjustment screws 120, 1 for adjusting the axial position of
26 is slightly protruded from the overhang surface 74 to prevent the wedge member 104 from slipping forward in the axial direction, and to allow the wedge member 104 to move in the axial direction within a certain range. The sheet 102 is disposed so as to abut 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 falling off from the reamer body 10.

Next, with the sheet 102 pressed against the wedge member 104, the first adjusting screw 120 screwed into the first female screw hole 116 is rotated, and the wedge member 10 is rotated.
4 is brought into contact with the first inclined surface 112. 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 seat 102 is moved outward in the radial direction. Sheet 102
When the radial position of the sub-cutting edge 160B of the tip 100 is appropriate (when the processing diameter is appropriate), the rotation of the first adjusting screw 120 is stopped. If the processing diameter becomes excessive, the first adjusting screw 120 is slightly loosened to allow the wedge member 104 to move forward in the axial direction. The screwed second adjustment screw 126 is rotated, and the wedge member 104 is moved forward in the axial direction. By adjusting the axial position of the wedge member 104 as described above, if the radial position of the sub-cutting edge 160B of the tip 100 is appropriate, that is, if the processing diameter becomes a desired size, the adjusting screw is adjusted. 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. Thus, the adjustment of the processing diameter is completed.

Next, the back taper is adjusted. As described above, before the adjustment of the back taper, the wedge member 104 is required.
Side surface 106 of the sheet 102 closely contacts the axial receiving surface 78.
The axial side surface 128 is in close contact with the side surface 108 of the wedge member 104, but the adjusting screw 150 screwed to the seat 102 is rotated to cause the adjusting screw 150 to project radially inward from the seat 102. The gap 12 between the sheet 102 and the wedge member 104
9 is formed (see FIG. 12). Seat 102 is seat 7
6 is rotated by a small angle in a state in which the sheet 102 is kept in close contact with the sheet 102.
30 is inclined with respect to the radial receiving surface 80, and comes into contact with the radial inner end of the radial receiving surface 80.

The secondary cutting edge 160B of the tip 100 is initially provided, that is, before the above-described adjustment of the back taper is performed.
Although the sheet has an excessive back taper, the back taper is reduced by rotating the sheet 102 as described above, and eventually becomes an appropriate value. In that 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 receiving surface 80,
Since the clearance 82 is formed, the radial side surface 130 of the sheet 102 comes into contact with the radial receiving surface 80 at a position near the outer periphery. If the back taper becomes excessive, the chip 100 is rotated together with the sheet 102 in a direction in which the gap 129 between the sheet 102 and the wedge member 104 is reduced (counterclockwise in FIG. 12).
As described above, the adjustment of the processing diameter is performed first and the adjustment of the back taper is performed later. However, the adjustment of the back taper may be performed first and the adjustment of the processing diameter may be performed later.

When the adjustment of the processing diameter and the back taper is completed as described above, 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, the clamp screw 16
8 is eccentrically engaged with the tapered inner peripheral surface 162 of the chip 100.
One side is pressed against the axial receiving surface 136 and the radial receiving surface 138 of the seat 102, respectively, and the axial side 128 and the adjusting screw 150 of the sheet 102 are pressed against the axial receiving surface 78 via the wedge member 104. ,
Further, the radial side surface 130 of the sheet 102 is directly pressed against the radial receiving surface 80, and the chip 100 is fixed in a state of being positioned with respect to the reamer body 10.

In this fixed state, as shown in FIG. 12, an axial side surface 128 of the sheet 102, which is a surface facing the wedge member 104, is brought into contact with the wedge member 104 at its leading end, and Gap 12 toward the rear
9 increases. Also, the radial side surface 1 of the sheet 102
30 is abutted only on the radial inner end of the radial receiving surface 80 of the reamer body 10. Therefore, sheet 1
02, the wedge member 104 and the reamer body 10 come into straight contact if they are rigid, but the gap between the radial side surface 130 and the radial receiving surface 80 and the angle of the gap 129 are very small. In addition, since the reamer body 10, the sheet 102 and the wedge member 104 are slightly elastically deformable, they actually come into contact on a relatively wide surface. Therefore, the holding rigidity of the sheet 102 by the reamer main body 10 is sufficiently high, and after all, the reamer main body 1
Therefore, the holding rigidity of the chip 100 due to 0 becomes sufficiently high.

As is clear from the above description, in the present embodiment, the wedge member 104, the first inclined surface 112,
The first adjusting screw 120, the second inclined surface 114 and the second adjusting screw 126 cooperate with each other to form a "first adjusting device", and the wedge member 104 and the adjusting screw 150 cooperate with each other to form the "second adjusting device". Is composed. Tip seat 13
4 constitutes a “first attachment seat”, and the seat holding portion 72 constitutes a “second attachment seat”.

According to the reamer, the adjustment of the processing diameter and the adjustment of the back taper can be performed independently. For example, even if the back taper is adjusted after the processing diameter is adjusted, the wedge member 104 and the sheet 102 may be positioned at the tip of the sheet 102 in the axial direction, that is, the secondary cutting edge 1 of the chip 100 in the axial direction.
Since the portion of the sub cutting edge 160B adjacent to the main cutting edge 160A does not change with the rotation of the sheet 102, the radial position of the portion of the sub cutting edge 160B adjacent to the main cutting edge 160A does not change. Further, even if the processing diameter is adjusted after the back taper is adjusted, the wedge member 1 is not affected.
As the sheet 04 moves in the longitudinal direction, only the axial front end and the axial rear end of the sheet 102 move in the radial direction by the same amount, and the sheet 102 does not rotate, so that the back taper does not change. Even if either the processing diameter or the back taper is adjusted first, the previously adjusted one does not change when adjusting the later one.

In this embodiment, the overhang surface 74 is formed along a plane including the central axis of the reamer main body 10, and the upper surface 132 of the sheet 102 is
When the main cutting edge 160A and the sub cutting edge 160B of the chip 100 are slightly higher than the upper surface thereof, the main cutting edge 160A and the sub cutting edge 160B are just lowered. Reamer body 10
Are located on a plane including the central axis of
However, the main cutting edge 160A and the sub cutting edge 160B are set at a position higher than the plane including the central axis of the reamer main body 10 (to raise the center) or at a lower position (to lower the center). It is also possible.

Further, in the above embodiment, the radial receiving surface 80 is formed along the radius of the reamer 10, but it may be formed to be slightly inclined with respect to the radial direction of the reamer 10. In this case, it is desirable to be inclined so that the outer peripheral side is located closer to the front end side in the axial direction. By doing so, regardless of the state of adjustment of the back taper, the radial side surface 130 of the seat 102 and the reamer body 1
0 in the radially outer surface 80.

Furthermore, in the above embodiment, the reamer main body 10 is formed integrally and the sheet holding portion 72 is formed by electric discharge machining. However, the member forming the overhang portion is provided separately from the reamer main body. It is also possible to form an overhang portion by manufacturing and machining the seat mounting seat on the reamer body, and then fixing the separate member to the reamer body.

In the above-described embodiment, the adjusting screw 150 provided on the sheet 102 is configured to abut the wedge member 104. However, as shown in FIG. Is the axial receiving surface 7
8 may be directly contacted. However, in this embodiment, when the back taper is adjusted first, the back taper changes when adjusting in the radial direction. Therefore, it is desirable to adjust the radius first.

Next, another embodiment will be described. This embodiment is substantially the same as the above embodiment in the configuration of the reamer main body, and differs in the configuration of the adjusting device for adjusting the processing diameter and the back taper.
This will be described with reference to FIGS.

In this embodiment, FIGS. 19 and 2
As shown in FIG. 0, the seating surface 76 of the seat holding portion 72 is closer to the rear end of the upper surface 110 of the wedge member 300 toward the seat 304.
A third inclined surface 302 is formed which is inclined in a direction approaching. Further, instead of forming the female screw hole 148 that penetrates the sheet 304 in the radial direction, the wedge member 300 is used.
Is formed so as to face the third inclined surface 302 of FIG. Specifically, as shown in FIG. 20, the sheet-side inclined surface 306 is formed continuously with the upper surface 32 of the sheet 304, and is inclined in such a direction that the inner side in the radial direction is separated from the overhang surface 74 of the sheet holding portion 72. ing. A female screw hole 308 is formed in the overhang portion 90 at a position facing the third inclined surface 302 and the seat-side inclined surface 306 in a direction perpendicular to the overhang surface 74, and an adjusting screw 310 is screwed into the female screw hole 308. The female screw hole 308 is formed to be slightly eccentric to the seat-side inclined surface 306, and if the adjusting screw 310 is rotated to project from the overhang portion 90 into the sheet holding portion 72, the female screw hole 308 contacts the third inclined surface 302. The back taper of the chip 100 can be reduced by abutting the sheet 304 on the sheet-side inclined surface 306 in a non-contact state and pushing the vicinity of the rear end of the sheet 304 outward. The third inclined surface 302 is formed by the wedge member 300 and the adjusting screw 310.
The wedge member 300 may be formed to have a short length in the axial direction so as not to interfere with the adjusting screw 310, instead of forming the third inclined surface 302. .

In this embodiment, a tapered surface is formed at the tip of the adjusting screw 310, and the tapered surface directly contacts the sheet-side inclined surface 306 to adjust the back taper of the chip 100. On the other hand, an adjusting piece having an inclined surface inclined along the seat-side inclined surface 306 is provided, an adjusting screw is provided outside the adjusting piece, and the axial position of the adjusting piece is defined by the adjusting screw to adjust the tip 10.
The back taper of 0 may be adjusted. By doing so, the inclined surface of the adjustment piece comes into surface contact with the seat-side inclined surface 306, and the contact area is increased as compared with the case where the adjustment piece is in contact with the tapered surface, so that the holding rigidity is improved.

In this embodiment, the wedge member 300
Although there is no moving means for moving the front in the axial direction, an axial forward moving means may be formed as described in the following section.

Another embodiment will be described. The reamer 400 is substantially the same as the above-described embodiment, but differs in an adjusting member for adjusting a back taper. Therefore, only the configuration of a different portion will be described in detail. As shown in FIGS. 21 to 23, the second inclined surface 114 is not formed also in the present embodiment. 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 of the overhang portion 90 opposed to that. Have been. The female screw hole 405 is formed eccentrically forward in the axial direction from the tapered hole 404. As shown in FIG. 23, the adjusting screw 406 having a tapered portion at the tip in the female screw hole 405
Are screwed, and the tapered portion eccentrically contacts the tapered hole 404, whereby the wedge member 402 can be moved forward in the axial direction. Note that a mechanism for moving the wedge member 402 forward in the axial direction is not essential.

Further, in the present embodiment, the wedge member 402 is formed so as to be in surface contact with the axial side surface 128 of the sheet 304, and is in contact with the axial direction receiving surface 78 of the sheet holding portion 72 at a point. It is formed as follows.
The wedge member 402 is brought into contact with the axial receiving surface 78 in the vicinity of the tip 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, the axial receiving surface 7 is positioned such that the wedge member 402 is sandwiched between the sheet holding portion 72 and the sheet 304 by a portion located near the main cutting edge of the chip 100 in the axial direction.
Escape portion 410 is formed at the distal end portion 8. A portion of the axial receiving surface that is located at a position more distal than the leading end of the sheet 304 is formed deeper in the radial direction than the other portions, and is formed so as not to contact the axial side surface 106 of the wedge member 402. This can prevent a gap from being formed inside the tip of the chip 100.

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. At the position of the reamer body facing the fourth inclined surface 412, the first female screw hole 11 is formed.
A fourth female screw hole 414 is formed in parallel with the sixth female screw hole 414. The fourth female screw hole 414 is formed to have a length that penetrates the overhang portion 90 and reaches the seat surface 76 of the seat holding portion 72. The back taper adjusting screw 4 is inserted into the fourth female screw hole 414.
16 is screwed. When the tapered surface of the back taper adjusting screw 416 abuts on the fourth inclined surface 412, the back taper of the sheet 304 and the chip 100 is adjusted. In this state, the fourth female screw hole 414
Is formed sufficiently deep so as not to interfere with the axial movement of the back taper adjusting screw 416. Only the inclined surface 412 of the sheet 304 actually contacts the tapered surface of the back taper adjusting screw 416. 4th slope 4
12 is formed so 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 processing diameter and the back taper completely independently.

In this embodiment, similarly to the above-described embodiment, instead of providing the back taper adjusting screw 416, an adjustment piece and an adjusting screw may be combined to adjust the back taper.

Although some of the embodiments of the present invention have been described above, these are merely examples, and the present invention is described in the section [Problems to be Solved by the Invention, Means for Solving Problems and Effects of the Invention]. Various modifications and improvements can be made on the basis of the knowledge of those skilled in the art, including the embodiment described above.

[0042]

[Brief description of the drawings]

FIG. 1 is a front view showing a reamer main body of a throw-away reamer according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a side view of the reamer main body shown in FIG. 1;

FIG. 4 is an enlarged front view showing a main part of FIG. 1;

FIG. 5 is a front view showing a wedge member of the throw away reamer.

FIG. 6 is a view as viewed in the direction of arrow A in FIG. 5;

FIG. 7 is another side view showing a main part of the throw away reamer.

FIG. 8 is a front view showing a seat of the throwaway 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. 10;

FIG. 13 is a side sectional view showing an essential part of FIG.

FIG. 14 is an enlarged front sectional view showing a main part of a throw-away reamer according to another embodiment of the present invention.

FIG. 15 is a front view showing a throw-away reamer according to yet 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 an essential part of the reamer.

20 is a sectional view taken along line XX-XX in FIG.

FIG. 21 is a front view showing a throw-away reamer of still another embodiment.

FIG. 22 is an enlarged front sectional view showing a main part of the reamer.

FIG. 23 is a sectional view taken along the line XXIII-XXIII in FIG. 22;

[Explanation of symbols]

90: overhang portion 100: throw-away tip 102: sheet 104: wedge member
112: first inclined surface 114: second inclined surface
120: first adjusting screw 126: second adjusting screw

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Atsushi Iwahori 26, Hirako Yoshiwara-cho, Toyota-shi, Aichi Prefecture Inside Fuji Seiko Co., Ltd. 72) Inventor Masataka Iwatsubo 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Kuniyoshi Miyazaki 1 Toyota Town Toyota City, Aichi Prefecture Inside Toyota Motor Corporation F-term (reference) 3C050 EB05 EB09

Claims (8)

[Claims] 1. A throw-away reamer having a generally polygonal flat plate-shaped throw-away tip detachably attached to a reamer main body, wherein the throw-away reamer has a flat bottom surface and two side surfaces. And a first mounting seat having a first seating surface that is a plane that is in close contact with the bottom surface of the throw-away tip, and two first receiving surfaces that are planes that are in close contact with the two side surfaces of the throw-away tip. And a second mounting seat having a second seating surface and two second receiving surfaces respectively corresponding to the bottom surface and the two side surfaces of the seat, wherein the two second receiving surfaces are respectively (a) A radial receiving surface extending substantially radially of the reamer and abutting against one of the two side surfaces of the sheet to define an axial position of the sheet; and (b) extending substantially axially of the reamer. And a reamer body that is an axial receiving surface that forms a wedge-shaped gap in which the gap is larger toward the distal end of the reamer between the other of the two side surfaces of the sheet, and the reamer is inserted into the wedge-shaped gap, A wedge member sandwiched between a portion of the axial receiving surface and one of two side surfaces of the sheet opposed thereto located in the vicinity of the main cutting edge of the indexable insert in the axial direction of the reamer; A first adjusting device that adjusts an insertion depth into the wedge-shaped gap; and a main adjuster of the indexable tip in the axial direction of the reamer, the axial direction receiving surface and one of two side surfaces of the sheet facing the axial direction receiving surface. A second adjusting device for adjusting a gap between a portion of the reamer that is disengaged from the cutting blade toward a base end side, the throw-away tip being the first mounting seat, and the seat being the second mounting seat. A clamping force is applied to the throw-away tip so that the throw-away tip approaches the radial receiving surface, the axial receiving surface, and the second seating surface. And a clamping device for clamping the reamer to the reamer body. 2. A method according to claim 2, wherein the throw-away tip has a clamp hole which penetrates a central portion in a thickness direction and has a tapered inner peripheral surface having a larger diameter toward the front side. A through hole formed in a portion of the first seat surface of the seat corresponding to the clamp hole of the throw-away tip; and a position substantially corresponding to the through hole of the seat in the second seat surface of the reamer body. A female screw hole formed, a male screw portion at a tip portion, and a tapered outer peripheral surface substantially corresponding to a tapered inner peripheral surface of the throw-away tip at a distal end portion. It is screwed into the female screw hole through the hole, and the tapered outer peripheral surface is eccentrically engaged with the tapered inner peripheral surface. The throw-away reamer according to claim 1, further comprising a clamp screw for applying a clamping force in a direction to approach the radial receiving surface, the axial receiving surface, and the second seating surface. 3. The first adjusting device is formed at an end of the wedge member on the distal end side of the reamer so as to be inclined in a direction approaching the second seat surface toward the distal end side of the reamer. A first inclined surface, a female screw hole formed substantially at right angles to the second seat surface in an overhang portion provided on the reamer main body so as to cover the second seat surface, and screwed into the female screw hole. 3. A first adjusting screw according to claim 1, further comprising a first adjusting screw which engages with a first inclined surface of the wedge member at a tapered outer peripheral surface formed at a tip and pushes the wedge member into the wedge-shaped gap. Throwaway reamers. 4. The wedge member according to claim 2, wherein the wedge member has a shaft extending from a main cutting edge of the indexable insert toward a base end of the reamer in an axial direction of the reamer. A second inclined surface extending parallel to the side surface on the direction receiving surface side, and being inclined in a direction closer to the second seating surface as approaching the side surface on the axial direction receiving surface side; A female screw hole formed substantially at right angles to the second seat surface in an overhang portion provided so as to cover the second seat surface; a second adjusting screw screwed into the female screw hole; The wedge member is provided so as to be movable in a direction substantially perpendicular to the second seat surface, and has an inclined surface corresponding to the second inclined surface of the wedge member. The inclined surface is the second seat surface of the second adjusting screw. As it moves to the side, it is pressed against the second slope The throw-away reamer according to any one of claims 1 to 3, further comprising an adjusting member that pushes the wedge member and the sheet toward the outer peripheral side of the reamer main body. 5. A female threaded hole formed in said seat through said seat in a direction substantially parallel to said bottom surface of said seat and substantially perpendicular to said axial receiving surface. 4. A second adjusting screw which is screwed into the female screw hole and which comes into contact with the axial receiving surface at the distal end via the wedge member or directly contacts the axial receiving surface to push the sheet away from the axial receiving surface. The throwaway reamer according to any one of the above. 6. The wedge member, wherein the second adjusting device is a portion of the seat that is displaced from a main cutting edge of the throw-away tip toward a base end of the reamer in an axial direction of the reamer and faces the wedge member. A portion extending parallel to a side surface of the sheet on the wedge member side, and
A second inclined surface formed to incline in a direction closer to the second seat surface as approaching the side surface on the side of the wedge member; and an overhang provided on the reamer body so as to cover the second seat surface. A female screw hole formed substantially at right angles to the second seat surface, a second adjusting screw screwed into the female screw hole, and the reamer body being movable in a direction substantially perpendicular to the second seat surface. An adjusting member that is held and has an inclined surface corresponding to the second inclined surface of the sheet, and is pressed against the second inclined surface by the second adjusting screw to push the sheet in a direction away from the axial receiving surface. The throw-away reamer according to any one of claims 1 to 3, comprising: 7. An outer peripheral surface of a cylindrical portion of the reamer body,
A groove having a generally rectangular cross-sectional shape, wherein the first side wall surface is located substantially on a plane including the center axis of the reamer body, and the second side wall surface extends parallel to the first side wall surface. Also, a portion of the first side wall forming the first side wall surface on the outer peripheral side of the upper portion of the cylinder extends parallel to the axial direction of the columnar portion, and is substantially perpendicular to the first side wall surface. The throw-away reamer according to any one of claims 3 to 6, wherein the overhang portion is formed by cutting off the remaining portion of the first side wall. 8. An outer peripheral surface of a cylindrical portion of the reamer body,
A guide that is provided so as to protrude radially outward from the outer peripheral surface thereof, contacts the inner peripheral surface of the hole to be machined by the throw away reamer, and keeps the throw away reamer and the hole to be machined concentrically. The throwaway reamer according to any one of claims 1 to 7, further comprising a pad.