JP2015024472A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool that can have a different kind of tool mounted on the same tool mounting body to decrease the number of components, and is good in convenience since a user need not change the tool mounting body as processing steps and processing conditions change and only replaces a tool on the processing spot.SOLUTION: A tool mounting body 4 includes an annular part 41, an arbor 42, a pull stud 43, a plate fitting part, and a sleeve fitted inside the plate fitting part. A rotation stop plate 5 includes a fitting hole where the plate fitting part is fitted, a hand reeling hole part formed on the reverse side of the fitting hole, a screw insertion hole 52 into which a screw is inserted, and a pin insertion hole 55. A tool retainer 6 includes a shaft fitting hole in which a shaft part is fitted, a female screw, and a holding hole for holding a tool 7. After the rotation stop plate 5 is threadably engaged with the tool mounting body 4 with the plate fitting part fitted in the fitting hole, the screw 81 is inserted into the screw insertion hole 52 and screwed in the female screw so as to fit the tool retainer 6 to the tool mounting body 4.

Description

  The present invention relates to a machine tool in which tools are sequentially mounted on end portions of a main shaft supported by a main shaft head via a tool mounting body, and machining by each tool is executed.

  The machine tool includes a spindle on which a tool is mounted, a spindle head that rotatably holds the spindle by a spindle motor, a machining table that supports a workpiece and is rotatable about a vertical axis, and a plurality of tool gripping portions that grip a tool. A tool magazine. The machine tool performs various processes by sequentially exchanging tools mounted on the spindle. The tool is mounted on the spindle via a tool mounting body. The main shaft has a tool mounting hole opened at the end. The tool mounting body has a fitting insertion portion, and the fitting insertion portion is fitted into the tool mounting hole to be mounted on the main shaft.

  Tools are roughly classified into rotating tools that rotate with the spindle and non-rotating tools (turning tools) that are fixed to the spindle head. When the rotary tool is mounted on the spindle, the workpiece is fixed to the processing table without rotating around the vertical axis, and cutting is performed by the rotary tool rotating together with the spindle. When the turning tool is mounted on the spindle, the spindle does not rotate, the workpiece rotates with the machining table around the vertical axis, and is turned by the turning tool.

  The turning tool is prevented from rotating by locking the spindle motor. Forces in various directions are applied to the turning tool being processed as it is pressed against the workpiece. It is not sufficient to lock the turning tool only by locking the spindle motor. In order to cope with this problem, various configurations for preventing the turning tool from rotating have been proposed.

For example, in the machine tool of Patent Document 1, a rotation stopper plate is fitted to the outside of the end of the tool mounting body, and two engagement holes are formed on the rotation stopper plate that are coaxial with the tool mounting body. Each of the engagement holes is engaged with an engagement protrusion provided on the lower surface of the spindle head so as to prevent the tool mounting body from rotating.
This machine tool has an end fitting hole that fits the end of the tool mounting body at a substantially central portion of the rotation stopper plate, and has a plurality of screw insertion holes through which screws are inserted outside the end fitting hole. Have. The tool mounting body has a female screw corresponding to the screw insertion hole on the contact surface with the rotation stopper plate. With the end fitted in the end fitting hole, insert a screw into the screw insertion hole from the lower side of the rotation stopper plate, and lock the head of the screw to the lower surface of the rotation prevention plate. The screw is attached to the tool mounting body by screwing.

JP2012-213826A

The tool mounting body has a tool fitting hole for fitting the end of the tool in the lower part. The tool fitting hole is a hole having a circular cross section that opens to the end face of the tool mounting body. The tool has a round bar-like end, and the end is fitted into a tool fitting hole and fixed.
If necessary, the tool is fitted in the tool fitting hole after a sleeve is fitted inside the tool fitting hole.

A turning tool is generally a square bit with an end having a square cross section. Square tools are mainly used for outer diameter machining of workpieces. The tool mounting body to which the square tool is attached has a square cross section of the tool fitting hole.
Therefore, it is necessary to use different tool mounting bodies between the square tool and the other tools.

When attaching a square tool to a tool mounting body having a tool fitting hole having a circular cross section, the square tool is fixed to the tool mounting body via an attachment. The attachment has a fitting section having a circular cross section that can be fitted into the tool fitting hole. The turning tool is fixed to the attachment, and is fixed to the tool mounting body by fitting the fitting portion into the tool fitting hole.
However, when a square tool is mounted on a tool mounting body provided with a detent plate as in Patent Document 1, the head of the screw protrudes from the lower surface of the detent plate as described above. Since there is a gap between the part and the surface of the attachment on the tool mounting body side, there is a problem that the attachment of the attachment to the tool mounting body is unstable. When the end of the tool mounting body is lengthened by this gap, the tool mounting body is different from other tools.

  The present invention has been made in view of such circumstances, and different types of tools can be mounted on the same tool mounting body, the number of parts and the management cost of the parts are reduced, and the user can perform the processing steps and processing conditions. It is not necessary to change the tool mounting body according to the change of the tool, it is only necessary to replace the tool at the processing site, it is convenient, and the purpose is to provide a machine tool that is well fixed when using an attachment And

  In the machine tool according to the present invention, a tool is mounted on the end portion of the spindle supported by the spindle head via a tool mounting body, and a detent plate for suppressing rotation of the tool is provided at the lower end of the tool mounting body. In a machine tool for processing a workpiece with the tool in a state of being fitted to the outside of the part and locked to the spindle head, a tool holder for holding the tool is attached to and detached from the rotation stop plate. It is characterized by.

In the present invention, the tool holder that holds the tool is configured to be mounted not on the tool mounting body but on the rotation stop plate, so that the tool mounting body is the same by changing the tool held on the tool holding body. Various processing can be performed using the above. That is, since a common tool mounting body can be used, the number of parts and the management cost of parts are reduced.
The user does not need to change the tool mounting body according to changes in the machining process and machining conditions, and only the tool needs to be replaced at the machining site, which is convenient.
Further, since the tool holder is fixed to the tool mounting body via the rotation stopper plate, the fixing is good.

  In the machine tool according to the present invention, the anti-rotation plate has a countersink hole that opens on one side and accommodates a plurality of screw heads, and a screw insertion hole that allows the leg of the screw to pass to the other side. The screw is inserted into each screw insertion hole, and the detent plate is screwed to the tool mounting body.

  In the present invention, since the head portion of the screw is housed in the countersink hole, it is attached to the rotation stopper plate in a state where the tool holder is in close contact with one surface of the rotation prevention plate without protruding from one surface of the rotation prevention plate. be able to. Therefore, it is not necessary to lengthen the head portion of the screw, the end portion of the tool mounting body, or the sleeve as in a conventional machine tool.

  In the machine tool according to the present invention, the tool holder has an abutting surface that abuts against the rotation stopper plate, and a plurality of female screws are provided on the corresponding contact surface. A plurality of second screw insertion holes are provided, and each screw is inserted into each second screw insertion hole so that the rotation stopper plate is screwed to the contact surface. It is characterized by.

  In the present invention, the tool holder can be easily attached to the rotation stopper plate. And the fixation to the rotation stop plate of a tool holder becomes better.

  The machine tool according to the present invention is characterized in that the tool holder has an annular groove at a portion where the lower end of the contact surface comes into contact, and an O-ring is fitted into the groove. And

  In this invention, it can seal with respect to coolant liquid.

  The machine tool according to the present invention is characterized in that the anti-rotation plate and the tool holder are each provided with a pin insertion hole through which a pin is inserted.

  In this invention, it can position reliably and can attach a tool holder to a rotation stop plate.

  The machine tool according to the present invention is characterized in that the female screw of the tool holder and the pin insertion hole are provided equally in the circumferential direction with respect to the axis of the main shaft.

  In the present invention, the tool holder can be rotated and attached to the rotation stopper plate.

  According to the present invention, since the tool holding body for holding the tool is attached to and detached from the rotation stop plate, different types of tools can be mounted on the same tool mounting body, and the number of parts and the number of parts can be reduced. Management costs are reduced. The user does not need to change the tool mounting body according to changes in the machining process and machining conditions, and only the tool needs to be replaced at the machining site, which is convenient. Further, since the tool holder is fixed to the tool mounting body via the rotation stopper plate, the fixing is good.

It is a side view of a machine tool. It is a perspective view which shows the state which fitted the rotation prevention board to the outer side of the lower end part of a tool mounting body, and attached the tool holding body to the rotation prevention board. It is a side view which shows the state of FIG. It is a side view which shows the state of FIG. It is the VV sectional view taken on the line of FIG. It is a top view which shows the state of FIG. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is the perspective view which looked at the rotation stopper plate from the upper side. It is the perspective view which looked at the rotation stopper plate from the lower side. It is a top view which shows a rotation stop plate. It is a reverse view which shows a rotation stop plate. It is a perspective view which shows a tool holder. It is a top view which shows a tool holder. It is a perspective view which shows the state which fitted the edge part of the pin to the pin fitting hole.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing a machine tool according to an embodiment. FIG. 1 is a side view of the machine tool 100. In the following description, up and down, left and right, and front and rear indicated by arrows in the figure are used.

  The machine tool 100 arranges a Y-direction moving device (not shown) on the upper surface of the base 10 and supports the Y-direction moving table 11 so that the Y-direction moving device can move in the Y direction. The Y-direction moving device is connected to an output shaft of a Y-axis motor (not shown), and includes a feed screw shaft that extends in the front-rear direction, a nut that engages with the feed screw shaft, and a guide rail that extends in the front-rear direction.

  An X-direction moving device (not shown) is provided on the nut. The X-direction moving device is connected to an output shaft of an X-axis motor (not shown), and includes a feed screw shaft extending in the left-right direction, a nut screwed into the feed screw shaft, and a guide rail extending in the left-right direction. The X direction is a direction orthogonal to the Y direction and the Z direction.

  The X-direction moving device supports the column 12 so as to be movable in the X direction. The column 12 has a columnar shape, and a Z-direction moving device (not shown) is provided on the front surface. The Z-direction moving device supports the spindle head 3 on the front side thereof so as to be movable in the Z direction. The Z-direction moving device is connected to an output shaft of a Z-axis motor (not shown) and extends in the vertical direction, a nut screwed into the feed screw shaft, and a guide extending in the vertical direction on the front surface of the column 12. A rail and a block fitted to the guide rail. The spindle head 3 is fixed to the nut and the block.

  The spindle head 3 moves up and down according to the rotation of the feed screw shaft driven by the Z-axis motor. Further, by driving the X-axis motor, the X-direction moving device moves to the left and right, and the spindle head 3 moves to the left and right. The Y-direction moving device moves back and forth by driving the Y-axis motor, and the spindle head 3 moves back and forth.

  The machine tool 100 supports the workpiece (workpiece) by the workpiece support device 15 and processes the workpiece with the tool 7 attached to the spindle head 3. The work support device 15 has a work table 16 for clamping the work. The work support device 15 can rotate the work around two axes. In general, when a workpiece is rotated about axes parallel to the X, Y, and Z axes that are axes for moving the spindle head 3, the rotation axes of the workpiece correspond to the X, Y, and Z axes as A, B , Called the C-axis. The work support device 15 according to the present embodiment is provided with a work table 16 on a rocking body (not shown) that rocks around the A axis. The work table 16 is provided with an A-axis motor (not shown), and the swinging body swings around the A-axis by the rotation of the A-axis motor 61. The workpiece can be rotated about the A axis by the oscillation of the oscillator. A work table 16 is connected to a C-axis motor 60 fixed to the rocking body, and the work clamped on the work table 16 can be rotated at high speed around the C axis.

  The spindle head 3 supports a spindle 34 inside. The main shaft 34 is connected to a main shaft motor 31 fixed to the upper portion of the main shaft head 3, and rotates around the central axis in the vertical direction by driving the main shaft motor 31. The lower end portion of the main shaft 34 protrudes below the main shaft head 3, and a tool 7 is attached and held as will be described later. The tool 7 is held by a tool holder 6, and the tool holder 6 is attached to a detent plate 5 fitted outside the end of the tool mounting body 4. The tool 7 is mounted on the main shaft 34 by inserting the tool mounting body 4 into the end of the main shaft 34. The tool 7 moves up and down with the spindle head 3.

  A plurality of tools 7 are stored in the tool magazine 2. The tool 7 includes not only rotating tools such as drills, taps, and end mills but also turning tools (non-rotating tools) such as tools. The tool magazine 2 includes a support beam 21, a rail 22, a chain 23, a plurality of gripping arms 24, a magazine drive unit 25, and the like. The support beam 21 is a plate-like structural member having a triangular shape inclined downward with the upper side as a hypotenuse, and is fixed to the left and right of the column 12 in a cantilever manner. The support beam 21 extends from a portion fixed to the left and right of the column 12 to be inclined downward from both sides of the spindle head 3. The upper end surface of the support beam 21 is inclined by approximately 30 ° from the horizontal plane from the front lower side to the rear upper side.

  The rail 22 is an oval annular member, and is fixed to the support beam 21 so as to surround the column 12 and the spindle head 3. The chain 23 is configured by connecting endlessly a plurality of moving platforms having rollers that fit on the rail 22 and roll on the rail 22. A gripping arm 24 is attached to each moving table, and the gripping arm 24 grips the tool mounting body 4 that holds the tool 7. The chain 23 circulates along the rail 22 by the drive of the magazine drive unit 25. When exchanging tools, the magazine drive unit 25 drives the chain 23 to circulate, and the gripping arm 24 that grips the desired tool 7 is transported to the lower front position of the spindle head 3 (the lower front end of the rail 22). The

  FIG. 2 is a perspective view showing a state in which the rotation stopper plate 5 is fitted to the outside of the lower end portion of the tool mounting body 4, and the tool holder 6 is attached to the rotation stopper plate 5, and FIGS. 3 and 4 are side views showing the state. 5 is a sectional view taken along line VV in FIG. 4, FIG. 6 is a plan view showing the above state, FIG. 7 is a sectional view taken along line VII-VII in FIG. 6, and FIG. is there.

  As shown in FIG. 2, the tool mounting body 4 includes an annular portion 41 having an axial center extending in the vertical direction, an arbor 42 that is tapered and continuously provided on the upper side of the annular portion 41, and an upper end portion of the arbor 42. A pull stud 43 provided continuously to the ring portion, a plate fitting portion 47 (see FIG. 5) that is provided continuously to the lower side of the annular portion 41, has a smaller diameter than the annular portion, and is fitted to the detent plate 5. And a sleeve 45 (see FIG. 5) fitted inside the fitting portion 47. The annular portion 4 has a holding groove 44 in the center in the thickness direction, and two key grooves 46 are provided at positions facing the radial direction of the annular portion 41.

  The tool 7 includes a blade portion 71 and a shank 72 that has a prismatic shape and supports the blade portion 71 at an end portion. Here, a square tool is shown as the tool 7.

9 is a perspective view of the anti-rotation plate 5 as viewed from above, FIG. 10 is a perspective view of the anti-rotation plate 5 as viewed from below, FIG. 11 is a plan view of the anti-rotation plate 5, and FIG. FIG.
The rotation stopper plate 5 includes a rectangular substrate portion 5a in plan view, a tapered portion 5b continuous with the substrate portion 5a, and a wide portion 5c that is continuous with the tapered portion 5b and wider than the substrate portion 5a.
Two engagement holes 51 are provided at both ends in the width direction of the wide portion 5c. The engagement hole 51 is a long hole extending toward the center of the rotation stopper plate 5. The engagement hole 51 is engaged with two engagement protrusions (not shown) provided so as to protrude downward from the lower end portion of the spindle head 2, so that the rotation stop plate 5 is locked to the spindle head 2. It is comprised so that.

The board portion 5a of the rotation stop plate 5 has a fitting hole 50 for fitting the plate fitting portion 47 at a substantially central portion.
As shown in FIGS. 10 and 12, the fitting hole 50 has counterbore holes 56 having an outer diameter larger than the diameter of the fitting hole 50 on both sides in the left and right direction of the lower part. The counterbore hole 56 has a stepped portion 56a.
Six screw insertion holes 53 are provided in the stepped portion 56a. As shown in FIG. 11, the six screw insertion holes 53 are divided into two groups on the left and right, and are provided point-symmetrically with the center of the fitting hole 50 as the center point.

  Six female screws 48 corresponding to the screw insertion holes 53 are provided in a portion near the outer periphery of the end surface of the annular portion 41 of the tool mounting body 4 (see FIGS. 7 and 8). With the head portion of the screw 84 locked to the step portion 56 a and the head portion stored in the counterbore hole portion 56, the leg portion of the screw 84 is inserted into the screw insertion hole 53 and screwed into the female screw 48. It is configured as follows.

  As shown in FIG. 11, the anti-rotation plate 5 is provided with four screw insertion holes 52 that are equally distributed in the circumferential direction with respect to the center of the fitting hole 50. Each screw insertion hole 52 is provided at the apex of a regular square. The screw insertion hole 52 is a counterbore hole configured so that the upper part has a two-stage structure having a larger diameter than the lower part, and a head part of a screw 81 described later is accommodated in the step part. Pin insertion holes 55 are provided diagonally adjacent to the pair of screw insertion holes 52 on the diagonal line.

FIG. 13 is a perspective view showing the tool holder 6, and FIG. 14 is a plan view showing the tool holder 6.
The tool holder 6 has a block shape. As shown in FIG. 14, both ends of the front side are equally cut out, one end of the back side is large, and the other end is cut out small.
As for one side of the tool holder 6, the upper part protrudes from the other part, and one side is cut out in a tapered shape. On the side surface adjacent to the one side surface, a holding hole 61 extending from a portion slightly below the upper side to the bottom surface is provided at the center in the width direction. The shank 72 of the tool 7 is fitted into the holding hole 61, and the tool 7 is held by the tool holder 6. On the inner wall of the holding hole 61 on the side surface adjacent to the side surface, there are provided two insertion holes 66 for inserting screws up and down.

At the center of the tool holder 6, a hole 63 that extends from the top to a length of approximately two thirds and that matches the hole of the sleeve 45 is provided. On the outer peripheral side of the hole 63, a groove portion 64 that is concentric with the hole 63 is provided at a predetermined interval from the hole 63.
As shown in FIG. 14, four female screws 62 are provided on the upper surface of the tool holder 6 at equal intervals in the circumferential direction with respect to the center of the hole 63. Each female screw 62 is provided at the apex of a regular square. Adjacent to each female screw 62, pin fitting holes 65 for fitting end portions of four pins 68 described later are provided at equal intervals in the circumferential direction with respect to the center of the hole 63. Each pin fitting hole 65 is provided at the apex of a regular square. There are two sets of a pair of pin fitting holes 65 on the same diagonal.
FIG. 15 is a perspective view showing a state where the end of the pin 68 is fitted into the pin fitting hole 65. The pin 68 includes a cylindrical portion and a small cylindrical portion having a smaller diameter than the cylindrical portion, and the small cylindrical portion is fitted into the pin fitting hole 65.

  When attaching the rotation stop plate 5 to the tool mounting body 4 configured as described above, the plate fitting portion 47 of the tool mounting body 4 is prevented from rotating with the two key grooves 46 aligned in the front-rear direction of FIG. 5 is fitted into the fitting hole 50. The six screws 84 from the opening side of the counterbore hole 56 are inserted into the screw insertion holes 53 with the heads engaged with the stepped portions 56 a of the counterbore hole 56, and the female screws 48 are screwed. (See FIGS. 7 and 8).

  An O-ring 69 is fitted into the groove 64 of the tool holder 6. By fitting the O-ring 69, it is possible to seal against the coolant liquid. As described above, the pin insertion holes 55 of the rotation stopper plate 5 are one set, and the pin fitting holes 65 of the tool holder 6 are two sets. In consideration of the direction of the tool holder 6 attached to the rotation stopper plate 5, the pins 68 and 68 are fitted into a pair of pin fitting holes 65 and 65 on the side corresponding to the pair of pin insertion holes 55 of the rotation stopper plate 5. Match. In FIG. 15, pins 68 and 68 are fitted in pin fitting holes 65 arranged in the left-right direction.

Positioning is performed by the pins 68 and 68, and the hole of the sleeve 45 of the tool mounting body 4 is aligned with the hole 63 of the tool holding body 6. As shown in FIG. 5, a hole plug 82 is fitted in the insertion hole 67.
Next, the screw 81 is inserted into each screw insertion hole 52 of the rotation stopper plate 5 and screwed into the female screw 62 of the tool holder 6 (see FIGS. 6 and 8).
Thereby, the tool mounting body 4, the rotation stopper plate 5, and the tool holding body 6 are integrated.
The tool 7 is fitted into the holding hole 61, a screw (not shown) is inserted into the insertion hole 66 and screwed into a female screw (not shown) provided in the shank 72, and the tool 7 is fixed to the tool holder 6. To do.

  The gripping arm 24 shown in FIG. 1 grips the tool 7 via the tool mounting body 4 by pushing the tip gripping portion 24 a branched into two into the holding groove 44 of the tool mounting body 4.

  In FIG. 1, the gripping arm 24 in the exchange position below the front of the spindle head 3 is in a posture in which the gripping tool 7 is mounted on the main spindle 34 and then separated from the main spindle 34 and waiting. . The grip arm 24 has an arm shaft hole (not shown) into which the arm shaft is inserted at the upper end. The axial direction of the arm axis is parallel to the X-axis direction when the gripping arm 24 is in the exchange position below the spindle head 3, and the gripping arm 24 rotates around the arm axis, so that the tip gripping part 24a is moved to the spindle 34. Approach and leave. A cam 32 extends vertically on the front side surface of the spindle head 3 so as to project forward. The grip arm 24 has a cam follower (not shown) that contacts the cam 32.

  A tapered hole whose inner diameter increases downward is formed at the lower end of the main shaft 34, and the tool mounting body 4 is mounted on the main shaft 34 by fitting an arbor 42 into the tapered hole. Two keys protrude from the peripheral edge of the lower end of the main shaft 34 in the radial direction and are fitted in the key groove 46 on the tool mounting body 4 side.

  The spindle head 3 descends from the position shown in FIG. 1 during machining, and rises from the origin position shown in FIG. 1 when changing tools. The gripping arm 24 swings following the rising and lowering of the spindle head 2. When the spindle head 3 is raised, the gripping arm 24 swings, and the tip gripping portion 24a of the gripping arm 24 grips the tool 7 mounted on the spindle 34 from the front via the tool mounting body 4.

  The spindle head 3 is further raised after the gripping of the tool mounting body 4 is completed. The tool mounting body 4 gripped by the gripping arm 24 moves relatively downward and is detached from the main shaft 34 together with the tool 7. The tool magazine 2 rotates in this state, and the gripping arm 24 holding the tool 7 to be used next is positioned below the main shaft 34.

  The tool 7 is mounted on the spindle 34 by lowering the spindle head 3 and fitting the tool mounting body 4 on the lower end of the spindle 34. The tool 7 attached to the spindle 34 is in the state shown in FIG. 1 when the spindle head 3 is lowered, and stands by in preparation for machining.

With the above operation, the tool 7 can be exchanged between the main shaft 34 and the tool magazine 2.
The tool 7 mounted on the spindle 34 moves down together with the spindle head 3 to process the workpiece on the work table 16.

  When the tool 7 is a turning tool such as a square tool, the spindle 34 is locked in a non-rotating state. The workpiece is attached to a turntable provided on the work table 16 and is rotated by the operation of the turntable. The tool 3 descends together with the spindle head 2 and turns the surface of the workpiece by pressing the tip against the rotating workpiece.

As described above, in the machine tool 100 according to the present embodiment, the tool holder 6 holding the tool 7 is configured to be mounted not on the tool mounting body 4 but on the rotation stop plate 5, so that the tool holding By changing the tool 7 held on the body 6, the tool mounting body 4 can be used for various processes using the same tool. For example, it is possible to perform processing by attaching a round bit to the tool holder 6 instead of a square bit. That is, since the common tool mounting body 4 can be used, the number of parts and the management cost of parts are reduced.
The user does not need to change the tool mounting body 4 in accordance with changes in the machining process and machining conditions, and only the tool 7 needs to be replaced at the machining site, which is convenient.

  In the present embodiment, since the head of the screw 84 is housed in the counterbore 56, the tool holder 6 is in close contact with the back surface of the rotation stop plate 5 without protruding from the back surface of the rotation stop plate 5. Thus, it can be attached to the rotation stop plate 5. Accordingly, it is not necessary to lengthen the head portion of the screw, the end portion of the tool mounting body 4 or the sleeve as in the conventional machine tool.

In the machine tool 100 according to the present embodiment, the female screw 62 of the tool holder 6, the pin fitting hole 65, the screw insertion hole 52 of the rotation stopper plate 5, and the pin insertion hole 55 are the axes of the main shaft 34. Since they are equally distributed in the circumferential direction with respect to the core, the tool holder 6 can be rotated and attached to the rotation stop plate 5.
In the present embodiment, the case where the pin 68 is fitted into the pin fitting hole 65 of the tool holder 6 is described. However, the present invention is not limited to this. 68 may be fitted to position the tool holder 6.

2 Tool magazine 3 Spindle head 34 Spindle 4 Tool mounting body 41 Ring portion 42 Arbor 43 Pull stud 45 Sleeve 47 Plate fitting portion 48 Female screw 5 Non-rotating plate 50 Fitting hole 52 Screw insertion hole 53 Screw insertion hole 55 Pin insertion Hole 56 Counter bore hole portion 56a Step portion 6 Tool holder 61 Holding hole 62 Female screw 64 Groove portion 65 Pin fitting hole 7 Tool 71 Blade portion 72 Shank 100 Machine tool

Claims (6)

A tool is mounted on the end of the main shaft supported by the main shaft head via a tool mounting body, and a detent plate for suppressing rotation of the tool is fitted to the outside of the lower end portion of the tool mounting body. In a machine tool that processes a workpiece with the tool while locked to the head,
A machine tool configured to attach and detach a tool holder for holding the tool to and from the rotation stop plate. The rotation stop plate is provided with a countersink hole that opens on one side and accommodates a plurality of screw heads, and a screw insertion hole that allows the leg portion of the screw to pass to the other side.
The machine tool according to claim 1, wherein each screw is inserted into each screw insertion hole and the rotation stop plate is screwed to the tool mounting body. The tool holder has a contact surface that contacts the rotation stopper plate, and a plurality of female screws are provided on the contact surface.
The rotation stopper plate is provided with a plurality of second screw insertion holes corresponding to the female screw,
3. The machine tool according to claim 2, wherein each screw is inserted into each second screw insertion hole, and the rotation stop plate is screwed to the contact surface. The tool holder has an annular groove in a portion where the lower end of the contact surface comes into contact,
The machine tool according to claim 3, wherein an O-ring is fitted in the groove.   The machine tool according to claim 3 or 4, wherein the rotation stopper plate and the tool holder are provided with pin insertion holes through which pins are inserted.   The machine tool according to claim 5, wherein the female screw and the pin insertion hole of the tool holder are provided at equal intervals in the circumferential direction with respect to the axis of the main shaft.

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