JP2008036768A - Chip suction hood device for chip suction collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply a chip suction hood device for a chip suction collector to such a processing operation in which a tool and a table move in various and wide ranges in a plurality of axes of Z axis, X axis and Y axis such as metal mold processing by an end mill. <P>SOLUTION: This device includes a suction sleeve 12 having a suction nozzle 13 with a suction port 14 which can surround the tool 34 at the tip of a spindle head 31 so as to be protruded at the tip, the ring-shaped suction hood 11 having a spindle head fitting sleeve 19 at a rear potion, and a number of air blower nozzles 21 which are disposed in a row in a concentric annular portion around the suction nozzle 13 of the suction hood 11. The air blower nozzles 21 form an air curtain which is formed of a spiral air flow moving toward a circumferential portion of a cutting position of a work 36 and form a water-spout air flow for sucking chips moving toward the suction port 14 of the suction nozzle 13 while turning in the same direction as the spiral air flow of the air curtain inside the air curtain. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a machine tool that cuts a workpiece by rotating around the axis of a cutting tool such as a milling cutter located at the tip of a spindle head (headstock) that can be brought into contact with and separated from the workpiece. The present invention relates to a chip suction hood device in a chip suction collector that sucks and collects generated chips.

  As is well known, this type of chip suction hood device is concentrically assembled as a main means near the tip of the spindle head and connected to a chip collecting device with suction air flow generating means such as a blower via a duct. The conventional suction hood has a configuration in which the chip suction port is assembled to the spindle head in a state where the chip suction port is substantially in close contact with the peripheral portion of the workpiece cutting point when cutting the workpiece with a tool. (For example, see Patent Documents 1, 2, and 3).

This conventional suction hood is applicable when the movement of the spindle head and hence the tool in the axial direction (Z-axis) and the table plane movement (X-axis movement, Y-axis movement) are relatively simple and narrow. However, if the tool and table move in various and wide ranges on multiple axes, such as the Z axis, X axis, and Y axis, as in the case of die machining with an end mill, these movements will be hindered. It is virtually impossible to apply.
JP-A-8-71886 JP-A-8-71884 Japanese Utility Model Publication No. 7-33513

  In view of the above points, the present invention provides a chip suction hood device for a chip suction collector that can be applied to a die machining by an end mill and can accurately suction chips. Is a major issue.

  According to the present invention, the above-described problem is that a suction nozzle with a suction port that concentrically surrounds the tip portion of the spindle head at the tip portion in a protruding state of the tool, as defined in claim 1. A ring-shaped suction hood having a spindle head fitting cylinder at the rear and a plurality of air blowing nozzles arranged in a concentric annular portion around the suction nozzle of the suction hood. An air curtain composed of a spiral air flow toward the workpiece side while turning around the axis of the tool is formed between the peripheral portion of the suction hood of the suction hood and the peripheral portion of the workpiece cutting point at the time of cutting of the workpiece. Chip suction trap that can form a tornado air flow from the workpiece side to the suction port of the suction hood while turning in the same direction as the spiral air flow forming the air curtain inside the curtain Solved by chip suction hood apparatus of the machine.

  In the chip suction hood device according to the present invention, it is desirable that the suction nozzle of the suction hood is formed in a tapered conical shape as described in claim 2.

  In the chip suction hood device according to the present invention, as described in claim 3, each air blowing nozzle is inclined inward so as to be directed to the extended axial portion on the tip side of the tool in the turning direction of the turning air flow. It is desirable.

  Further, in this chip suction hood device, as described in claim 4, a plurality of centripetal guide blades extending in the swirling direction of the tornado air flow immediately before the periphery of the suction port on the suction nozzle of the suction hood It is desirable to line up.

  Further, as described in claim 5, the chip suction hood device is preferably assembled to the spindle head so as to be separable in the axial direction.

  The present invention further provides a chip suction hood device used in combination with a tool having an air outlet at its tip as described in claim 6.

  According to the chip suction hood device according to the first aspect of the present invention, since the suction hood occupies a position separated from the processing portion of the workpiece by the tool, the tool and the table can be moved in various ways on a plurality of axes. Is applicable, and the chips are sucked into the suction port by the tornado air flow inside the air curtain extending between the suction hood and the work or table, so that the chips can be sucked accurately.

  According to the tapered conical configuration of the suction nozzle of the suction hood according to claim 2, since a powerful tornado air flow having a reduced diameter enters the suction port, chip suction is more accurately performed. .

  According to the inwardly inclined configuration of the air blowing nozzle according to claim 3, the air curtain is formed into a substantially cylindrical shape suitable for formation of a tornado air flow and hence suction of chips by the interference between adjacent blowing airs. Become.

  According to the installation configuration of the centripetal guide wing according to claim 4, since the chips in the tornado air flow are directed toward the center portion thereof, the peripheral speed is particularly large with a large diameter generated during processing by a face mill or the like. Even high chips are accurately sucked into the suction port of the suction hood.

  According to the separation structure with respect to the spindle head of the chip suction hood device according to claim 5, in the standby state in which the spindle head, and thus the tool is separated from the workpiece, the spindle is separated from the spindle head via movement toward the workpiece. The space around the tip of the head can be made a free space, and this makes it possible to smoothly change the tool particularly in the machining center.

  According to the combined use configuration with the tool with the air outlet according to the sixth aspect, the tornado air flow toward the suction port of the suction hood is accelerated, and chip suction is accurately performed at high speed.

  A preferred embodiment of a chip suction hood apparatus for a chip suction collector according to the present invention will be described below with reference to the drawings.

  FIG. 1 schematically shows a configuration of a main part of a preferred embodiment of a chip suction hood apparatus according to the present invention. A ring-shaped suction hood 11 which is a main component of the chip suction hood apparatus 10 is a spindle head 31. A suction cylinder 12 having a height capable of enclosing from a lower end portion of the main shaft 32 occupying the tip (lower end) portion thereof to a tool holder 33 attached to the main shaft 32 and an upper portion of the tool 34 held by the tool holder 33; A spindle head fitting cylinder 19 having a stepped lower conical inner peripheral wall portion that can be fitted in the vicinity of a stepped lower thin conical tip end portion of the spindle head 31 disposed concentrically is provided. is doing.

  The former suction cylinder 12 extends from a portion facing the tip portion (lower end portion) near the tool holder 33 to an intermediate portion facing portion of the tool 34 in a state in which the diameter decreases toward the tip portion side of the tool 34 and the tip. A suction nozzle 13 having a lower fine conical shape and a barrel 15 arranged concentrically on the suction nozzle 13. A spindle head insertion center hole 17 is provided at the upper end of the barrel 15. A horizontal partition wall 16 is attached.

  On the other hand, the latter spindle head insertion cylinder 19 is concentrically disposed on the partition wall 16 attached to the barrel 15 of the suction cylinder 12 so that the lower end thereof is placed on the periphery or the vicinity of the periphery.

  Further, a suction cylinder outlet 18 is formed in the vicinity of the outer periphery of the partition wall 16 attached to the cylinder 15 and is opened to the outside of the lower end of the spindle head fitting cylinder 19 so as to communicate with a suction duct 24 described later. It is.

  The air blowing nozzle 21, which is another main component of the chip suction hood device 1, has a tool in the air swirling direction at the annular lower portion of the outer cylinder 20 surrounding the barrel 15 and the spindle head fitting cylinder 19 of the suction hood 11. 34, the air supplied through an annular air supply path 22 provided between the outer cylinder 21 and the cylinder 15 immediately above the outer cylinder 21 and the cylinder 15 34 is extended obliquely toward the extended axis portion below 34, in other words, the table 35 that supports the workpiece.

  The outer cylinder 20 is connected to the suction cylinder outlet 18 of the partition wall 16 of the suction cylinder 15 through the pocket 25 surrounded by the outer cylinder 20, the spindle head fitting cylinder 19, and the partition wall 16. The duct connection port 23 is formed.

  As shown in FIG. 1, the chip suction hood device 10 includes a spindle head fitting cylinder 19 of the suction hood 11 and a partition wall 16 of the suction cylinder 15 that are fitted and engaged with the vicinity of the tip of the spindle head 31. The tool 34 is used in the assembled state in which the spindle head protrudes from the suction port 14 of the suction nozzle 13 of the suction hood 11, and the spindle head 31 is cut from the standby position above the table 35 so that the tool 34 engages the workpiece 36. In the process of cutting the work 36 while lowering the position to the position and rotating the tool 34 around the axis, air is blown from all the air blowing nozzles 21, so that the periphery of the suction port 14 and the work 36 cutting point. A cylindrical air curtain consisting of a spiral air flow is formed between the air curtain and the corresponding part of the table 35, while the air curtain is the same as the air curtain. While swirling in the direction toward the suction port 14 of the suction hood 11 to form a tornado air flow.

  After the tornado air flow formed in the air curtain, chips generated by cutting the workpiece 36 are accurately sucked into the suction cylinder 12 of the suction hood 11 through the suction port 14, and then the pocket 25 and the The chip suction hood device 10 is left through the duct connection port 23 of the outer cylinder 20, and is then sucked into the collection portion through the suction duct 24.

  2 to 3 exemplify two configurations attached to the embodiment shown in FIG. 1, and FIG. 2 shows a plurality of centripetal guides immediately before the suction port 14 of the suction hood 11. A configuration provided with wings 26 is illustrated. In this example, each centripetal guide vane 26 extends in the swirl direction of the tornado air flow, and the suction port 14 that faces the suction nozzle 13 of the suction hood 11 and faces a tool 34 (for example, a front milling cutter) protruding from the suction port 14. It is attached so as to surround the immediately preceding part.

  FIG. 3 shows a configuration example for enabling the chip suction hood device 10 to be separated from the spindle head 31. Here, the chip suction hood device 10 is attached to the spindle head 31 by an air cylinder 27. When the tool 34 in the machining center is replaced, for example, when the spindle head 31 is in the standby state above the table 35, the chip suction hood device is projected through the downward projection of the rod 28. 10 is separated from the spindle head 31 and moved downward.

  In the chip suction hood device according to the present invention, in addition to this, the suction cylinder outlet formed on the partition wall of the suction cylinder is spaced not only at one portion corresponding to the duct connection port of the outer cylinder but around the axis of the partition wall. In particular, the outer side of the spindle head fitting cylinder is arranged so that a series of arc-shaped or annular pockets are formed around the shaft communicating with all the suction cylinder outlets. The tornado air flow is generated by high-speed air blowing through the air blowing port by deforming the contour, separating from the spindle head via a feed screw mechanism, or using a tool having an air blowing port at the tip. It can be implemented in various forms such as being accelerated.

It is a structure schematic diagram of the principal part of suitable embodiment of the chip suction hood apparatus which concerns on this invention. It is a schematic plan view of the structural example of the centripetal guide vane attached to the suction hood of the embodiment shown in FIG. It is a schematic front view which shows the example of a separation structure with respect to the spindle head of the chip suction hood apparatus attached to the embodiment shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Suction hood apparatus 11 Suction hood 12 Suction cylinder 13 Suction nozzle 14 Suction port 15 Body cylinder 16 Partition wall 17 Spindle head insertion center hole 18 Suction cylinder outlet 19 Spindle head fitting cylinder 20 Outer cylinder 21 Air blowing nozzle 22 Annular air supply path 23 Duct connection port 24 Suction duct 25 Pocket 26 Centering guide vane 27 Air cylinder 28 Rod 31 Spindle head 32 Spindle 33 Tool holder 34 Tool 35 Table 36 Workpiece

Claims (6)

  A ring-shaped suction hood having a suction nozzle with a suction port concentrically surrounding the tip of the spindle head in the protruding state of the tool at the tip and a spindle head fitting cylinder at the rear, and a suction nozzle of the suction hood It includes a number of air blowing nozzles arranged in a concentric annular part around it, and the air blowing nozzle is located between the vicinity of the suction nozzle of the suction hood and the periphery of the workpiece cutting point when cutting the work with a tool. An air curtain composed of a spiral air flow toward the workpiece side while turning around the axis of the tool is formed, and the suction hood is turned from the workpiece side while turning in the same direction as the spiral air flow forming the air curtain inside the air curtain. A chip suction hood device for a chip suction collector capable of forming a tornado air flow toward the suction port.   2. The chip suction hood device according to claim 1, wherein the suction nozzle of the suction hood is formed in a tapered conical shape.   The chip suction hood device according to claim 1 or 2, wherein each air blowing nozzle is inclined inward so as to be directed toward an extended axis portion on the tip side of the tool in a turning direction of the turning air flow.   The chip suction hood device according to any one of claims 1 to 3, wherein a plurality of centripetal guide vanes extending in the swirling direction of the tornado air flow are arranged in the suction nozzle of the suction hood immediately before the periphery of the suction port. .   The chip suction hood apparatus according to any one of claims 1 to 4, wherein the chip suction hood apparatus is assembled to the spindle head so as to be separable in the axial direction.   The chip suction hood apparatus according to any one of claims 1 to 5, wherein the chip suction hood apparatus is used in combination with a tool having an air outlet at a tip portion.

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