JP2003275933A - Tool holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool holder having superior flexibility and allowing machining while properly using the same or different types of tools held by the tool holder, separately. <P>SOLUTION: The tool holder 100 comprises a tool holding body 140 capable of holding a plurality of different or same types of tools T1, T2 for holding at least one tool T1 of the plurality of tools T1, T2 so as to be movable forward/backward between a storage position where no interference with a work occurs during machining the work with the other tool T2 and a protrusion position where work machining is possible, and converting means 121, 131 to be in engagement with a control shaft 11 in a disengageable manner for converting the rotation of the control shaft 11 into the forward/backward movement of the tool holding body 140 when the control shaft 11 is rotated relatively to a spindle 10. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a tool holder for holding a tool for machining a work.

[0002]

2. Description of the Related Art A tool holder is known which is mounted on a spindle or the like of a machine tool to machine a workpiece with a held tool.
When performing complex machining such as cutting and drilling on a workpiece with such a tool holder, different types of tools required in each machining process are held in the tool holder and prepared. The work is processed while the tool holder is replaced according to the process.

However, in many cases, conventional tool holders generally hold only a single tool in a single tool holder, which requires a number of tool holders corresponding to the number of machining steps. Since it is necessary to replace the tool holder every time the machining is switched, it is difficult to further reduce the machining time of the work and the cost is increased.

There is also a tool holder that holds a plurality of different types of tools, but since each of the tools is fixedly held by the tool holder, machining that can be performed using this tool holder There is a problem that the types are limited and not general-purpose. For example, there is known a composite processing tool in which a tap for tapping a screw hole is integrally attached to the rear end of a drill for drilling a tapped hole. There is a problem that it can only be used for.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to carry out machining while properly using the same kind of tool or a different kind of tool held in the tool holder. An object of the present invention is to provide a tool holder excellent in versatility that can perform a plurality of machining steps continuously without exchanging the tool holder.

[0006]

In order to solve the above problems, a tool holder according to a first aspect of the present invention is a tool holder, and a rotatable control shaft that is provided by being inserted through a through hole of the main shaft.
A tool holder that is mounted on the spindle of a machine tool having a drive control means that rotates the spindle and the control shaft to rotate synchronously and relatively to each other, and holds a tool for machining a workpiece. Of the plurality of tools, at least one of the plurality of tools, a storage position that does not interfere with the work during machining of the work by another tool, and a protruding position that allows machining of the work. Between the tool holder that holds the tool shaft that is movable back and forth between the tool and the control shaft, and when the control shaft rotates relative to the main shaft, the rotation of the control shaft is controlled by the tool. And a conversion means for converting the holding body into forward / backward movement.

According to this structure, it becomes possible to machine a work while switching a plurality of tools of a single tool holder, and it is possible to replace the tool holder for complex machining by a plurality of tools. You will be able to do without it. That is, one tool held by the tool holder is stored in a storage position where it does not interfere with the work, and the work is processed by another tool, and then the control axis is relatively moved with respect to the main axis. By rotating the one tool to a position where the work can be processed, the work can be processed by the one tool.

According to a second aspect of the present invention, there is provided a tool holder in which the conversion means is rotatably supported in the tool holder and is engaged with the control shaft in a detachable manner, and the tool holder. A screw hole that is screwed into the rotary shaft to move the tool holder forward and backward by the rotation of the rotary shaft. According to this configuration, the control shaft rotates relative to the main shaft, so that the rotation shaft rotates relative to the tool holder. Since the rotary shaft and the tool holder are screwed together, the tool holder moves forward and backward by the action of the screw due to the rotation of the rotary shaft.

In this case, it is preferable that the tool held by the tool holder is a rotary tool and the other tool held by the tool holder is a cutting tool. By doing so, for example, after machining a counterbore hole with a cutting tool, a machining tool such as a drill can be moved from the retracted position to the protruding position to machine a pilot hole or the like at the bottom of the counterbore hole. it can.

According to a fourth aspect of the present invention, there is provided a tool holder, wherein the converting means is rotatably supported in the tool holder, and the rotary shaft is engaged with the control shaft in a disengageable manner. A moving body having a screw hole that moves forward and backward in the same direction as the axis of the rotating shaft, and the forward and backward movement of the moving body is converted into forward and backward movement of the tool holder in a direction intersecting the axis of the rotating shaft. The second conversion means is provided. According to this structure, the rotation of the rotating shaft is converted into the forward / backward movement of the moving body by the converting means. Then, the advancing / retreating movement of the moving body is converted into the advancing / retreating movement of the tool holder in the direction intersecting with the rotation axis by the second converting means.

Further, according to a fifth aspect of the present invention, the second conversion means has an inclined surface formed on the movable body and an inclined surface formed on the tool holder and slidably contacting the inclined surface of the movable body. And a surface. According to this configuration, as the movable body moves forward and backward, the inclined surface of the tool holder slides along the inclined surface of the movable body, so that the tool holder intersects the axis of the spindle. Move back and forth in the direction you want to.

A tool holder according to a sixth aspect of the present invention is the tool holder according to the first aspect.
In the case described in (1), the conversion means is rotatably supported in the tool holder, and is provided on the rotation shaft that is releasably engaged with the control shaft and is provided on the rotation shaft. And an eccentric cam connected to each other. According to this configuration, when the control shaft rotates relative to the main shaft, the eccentric cam rotates to move the tool holding portion forward and backward. As described in claim 7, a plurality of the tool holders may be provided around the eccentric cam. By doing so, it becomes possible to successively perform a plurality of machining steps while sequentially switching a plurality of tools.

As a machine tool to which the tool holder of the present invention is attached, it is preferable that the machine tool has a radial cutting function (U-axis function). By doing so, when operating the tool holder of the present invention, the existing U-axis function can be used as it is. Further, in this case, as described in claim 9, the tool holder includes a tool mounting head for mounting a tool, and a holder main body to which the tool mounting head is detachably mounted and mounted on a spindle of the machine tool. , A rotary shaft that engages with the control shaft and transmits the rotation of the control shaft, and the holder body and the rotary shaft may be shared with a tool holder having a radial cutting function. . By doing so, it is possible to easily switch between the tool holder of the present invention and the U-axis tool holder.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the tool holder of the present invention will be described in detail below with reference to the drawings. [First Embodiment] FIG. 1 is a vertical sectional view of a tool holder according to a first embodiment of the present invention, and FIG.
FIG. 2B is a sectional view taken in the direction I, and FIG. 2B is a sectional view taken in the direction II-II in FIG. In the following description, the term "front" means the left side of FIG. 1, and the term "rear" means the right side of FIG. The tool holder 100 is inserted into a tool mounting head 110 that holds a plurality (three in this embodiment) of tools T1 and T2 for cutting a work on the peripheral surface, and a tool mounting hole 10b of a spindle 10 of a machine tool. It has a holder main body 150 and a pull stat 170 attached to the rear end of the holder main body 150 and held by a collet chuck or the like in the spindle through hole 10a.

As shown in FIG. 2B, on the outer peripheral surface on the front end side of the tool mounting head 110, tool mounting portions 114 for mounting a tool T2 such as a cutting tool are formed at two positions symmetrical with respect to the axis C. The tool T2 is attached to each tool attachment portion 114 with a bolt or the like. Further, each of the tool mounting head 110, the holder body 150, and the pull stat 170 is formed with through holes 110a, 150a, 170a which communicate with each other on the axis C of the tool holder 100. The rotary shaft 120 is inserted through the through holes 110a, 150a, 170a.

The rotary shaft 120 is located on the same axis as the axis C of the main shaft 10, and the through hole 15 of the holder main body 150.
It is rotatably supported by a bearing 152 within 0a. Further, the rotating shaft 120 has a collar portion 124 that engages with the rear surface of the bearing 152, and a screw portion 122 that projects from the front surface of the bearing 152. The nut 123 screwed into the screw portion 122 and the collar portion. By sandwiching the bearing 152 from the front and back with 124, movement in the front-back direction is restricted.

The rotary shaft 120 located in the through hole 110a.
Is formed as a screw shaft 121. On the other hand, in the through hole 110 a of the tool mounting head 110, a movable body 130 that is movable back and forth is inserted in front of the rotary shaft 120. The moving body 130 moves forward and backward in the same direction as the axis C while being guided by the guide sleeve 115 fitted in the through hole 110a. Then, this moving body 130
The screw shaft 121 of the rotary shaft 120 is screwed into the screw hole 131 formed in the rear end surface. The moving body 130
So as not to rotate in the through hole 110a.
Rotation is restricted by a key 135 or the like provided in 0a, and when the work is machined, the tool holder 100 and the tool holder 100 rotate together.

According to the above aspect, when the rotary shaft 120 rotates with respect to the moving body 130, the screw shaft 121 and the screw hole 13 are formed.
The moving body 130 moves forward or backward in the same direction as the axis C by the screwing action with 1. Specifically, when the rotating shaft 120 rotates in the direction in which the screw shaft 121 is screwed into the screw hole 131, the moving body 130 retracts, and the screw shaft 121 is screwed into the screw hole 13.
When it is rotated in the direction in which it is unscrewed from 1, the moving body 130 advances.

At an intermediate portion of the moving body 130 in the front-back direction,
An inclined surface-shaped cam portion 1 is formed by obliquely cutting out a part of the outer peripheral surface.
32 is formed. Further, a through hole 110b is formed at one end of the tool mounting head 110 so as to vertically cross the through hole 110a. And this through hole 1
A tool holder 14 that holds one of the plurality of tools T1 and T2 (tool T1 in the example of FIG. 1) in 10b.
0 is inserted. The tool holder 140 has a storage position (a position indicated by a solid line in FIG. 2B) that does not interfere with the work when the work is processed by another tool T2, and the tool T.
It is possible to move back and forth with respect to a projecting position (position shown by the same phantom line) by which the work can be processed by 1.

The tool holder 140 is roughly composed of a head portion 142 on the tip side to which the tool T1 is attached by bolts and the like, and a shaft portion 141 extending from the head portion 142 into the through hole 110b. The head 142 is formed with an inclined sliding contact surface 142 a that is in sliding contact with the cam portion 132 of the moving body 130. Further, a spring 145 is provided outside the shaft portion 141.
The spring 145 always biases the sliding contact surface 142a of the head portion 142 against the cam portion 132. The biasing force of this spring 145 is
Even if a centrifugal force acts on the tool holder 140 during the rotation of 00, the tool holder 140 should have a spring constant such that the tool holder 140 does not easily move to the outside in the radial direction of the tool holder 100.

According to the above aspect, the forward / backward movement of the moving body 130 in the same direction as the axis C is caused by the cam portion 132 and the sliding contact surface 142a.
Is converted into movement in a direction orthogonal to the axis C by and, and the tool holder 140 and the tool T1 are moved in the radial direction of the tool holder 100. Specifically, when the moving body 130 moves backward,
When the tool holder 140 and the tool T1 move radially outward of the tool holder 100 and the moving body 130 moves forward, the spring 1
The urging force of 45 causes the tool holder 140 and the tool T1 to move radially inward of the tool holder 100.

As described above, in this embodiment, the rotary shaft 1
The screw shaft 121 of 20 and the screw hole 131 of the moving body 130 constitute a converting unit that converts the rotation of the rotating shaft 120 into the forward / backward movement of the tool holder 140. Further, the cam portion 132 and the sliding contact surface 142a constitute second conversion means for converting the forward / backward movement of the moving body 130 into the forward / backward movement of the tool holder 140 and the tool T1 in the direction intersecting the axis C.

Next, a drive mechanism for rotating the rotary shaft 120 synchronously or relative to the moving body 130 will be described. The drive mechanism is roughly composed of a control shaft 11 rotatably provided in the main shaft through hole 10a and a drive control means for controlling the drive of the control shaft 11. At the front end of the control shaft 11 described above, the tool holder 100 is attached to the spindle 1.
It is formed as a concave engaged portion that can be engaged with the convex engaging portion 128 formed at the rear end of the rotary shaft 120 when mounted on 0.

Then, by the action of the drive control means, the control shaft 11 rotates synchronously with the main shaft 10 or rotates relative to the main shaft 10 at a predetermined speed difference, whereby the rotary shaft 120 and the moving body 130 rotate synchronously or relatively. . Hereinafter, an example of drive control means for rotating the control shaft 11 synchronously or relatively to the main shaft 10 will be described with reference to FIG.

FIG. 3 is a block diagram illustrating an example of the drive control means described above. The drive control means shown in FIG. 3 is known as a U-axis control mechanism of a machine tool having a radial cutting function (U-axis function). Although various configurations of the U-axis control mechanism are known, in this embodiment, the main shaft 10 is the built-in type motor 1.
3 is driven, and the control shaft 11 is rotated by driving the servomotor 14. Further, the rotation speed of the main shaft 10 and the rotation speed of the control shaft 11 are detected by the sensors 10b and 11b provided corresponding to each, and based on the detection results of the sensors 10b and 11b,
It is assumed that the drive of the servo motor 14 is controlled.

The drive of the spindle motor 13 is controlled by a motor drive command signal from the CPU 20. The motor drive command signal is input to the motor drive circuit 21 and output to the spindle motor 13 as a predetermined drive signal. Also,
The motor 14 for rotating the control shaft 11 is driven by the CPU 2
The speed processing circuit 22a that outputs a speed signal based on the motor drive command signal from 0, and the motor 14 that drives the control shaft 11 to rotate at a predetermined speed based on the output signal from the speed processing circuit 22a It is controlled by the servo processing circuit 22b. Further, based on a command from the CPU 20, the control shaft 11 for the spindle motor 13 is
A superposition circuit 23 for instructing the relative rotation speed is provided, and the relative rotation speed signal designated by the superposition circuit 23 is input to the speed processing circuit 22a.

The sensor 10b for detecting the rotational speed of the main shaft 10 outputs a detection signal when it detects the detected member 10a attached to the outer peripheral surface of the main shaft 10, and this detection signal is input to the speed processing circuit 22a. The rotation speed of the spindle 10 is calculated. Further, when the sensor 11b for detecting the rotation speed of the control shaft 11 detects the detected member 11a attached to the outer peripheral surface of the control shaft 11, a detection signal is output, and this detection signal is input to the speed processing circuit 22a. The rotation speed of the control shaft 11 is calculated.

The speed processing circuit 22a outputs a command to the servo processing circuit 22b so that the control shaft 11 and the main shaft 10 rotate at a predetermined rotational speed difference designated by the synchronization or superposition circuit 23, and the motor 14 is driven. Control the drive. When the rotation speed of the control shaft 11 and the rotation speed of the main shaft 10 are synchronized, the rotation shaft 120 of the tool holder 100 engaged with the control shaft 11 is stationary relative to the moving body 130. Since it is in the state, the tool holder 140 and the tool T1 do not move. When the control shaft 11 rotates at the rotation speed difference designated by the superposition circuit 23, the rotation shaft 120 moves the moving body 130.
Rotate relative to the moving body 130 to move the moving body 130 back and forth. As a result, the tool holder 140 and the tool T1 move back and forth in the radial direction of the tool holder 100.

Next, an example of combined machining using the tool holder 100 having the above structure will be described with reference to FIGS. In the following description, after the hole inner peripheral surface Wa of the workpiece W is cut by the tool T2 for hole inner peripheral surface processing held by the tool holder 100, a groove is formed in a part of the hole inner peripheral surface Wa. The description will be made assuming that the groove Wb is formed over the entire circumference of the hole inner peripheral surface Wa using the processing tool T1.

As shown in FIG. 4 (a), the control shaft 11 and the rotary shaft 120 are rotated relative to the main shaft 10 before cutting the hole inner peripheral surface Wa using the tool T2. The moving body 130 is pushed forward of the tool holder 100, and the tool T1 is stored in the tool holder 100 by the biasing force of the spring 145. This prevents the tool T1 and the work W from interfering with each other during the machining of the hole inner peripheral surface Wa by the tool T2.

After the tool T1 is stored at a predetermined position in the tool holder 100, the speed of the control shaft 11 is adjusted to rotate the control shaft 11 synchronously with the main shaft 10. This allows
The tool T1 is held in the storage position. In this state, the tool holder 100 is moved in the same direction as the axis C, and the tool T
The inner peripheral surface Wa of the hole is processed by 2. After the machining of the hole inner peripheral surface Wa is completed, the tool holder 100 is moved in the same direction as the axis C to position the hole inner peripheral surface Wa at a predetermined position.

Next, the control shaft 11 is rotated with respect to the main shaft 10 at a predetermined rotational speed difference. Thereby, the moving body 13
0 moves backward at a predetermined speed, and the tool holder 140
And the tool T1 moves toward the outer side in the radial direction of the tool holder 100 at a predetermined speed. The cutting edge of the tool T1 is the inner peripheral surface W of the hole.
When reaching a, processing of the groove Wb by the tool T1 is started. After that, the groove Wb is machined while controlling the rotation speed of the control shaft 11 based on a command from the superposition circuit 23 so that the feed speed of the tool T1 becomes appropriate.

After the machining of the groove Wb is completed, the rotational speed of the control shaft 11 is controlled to move the moving body 130 forward to move the tool T1 to the retracted position, and then the tool holder 100 is moved in the same direction as the axis C. To move away from the work W. As described above, according to the tool holder 100 of the present invention, it is possible to perform a plurality of processes without replacing the tool holder 100, and it is possible to significantly reduce the processing time.

[Second Embodiment] Next, a second embodiment of the tool holder of the present invention will be described with reference to FIG. 5A is a sectional view of a front end portion of a tool holder according to the second embodiment of the present invention, and FIG. 5B is FIG. 5A.
FIG. 3 is a sectional view of the tool holder in the direction III-III. In the tool holder 200 of this embodiment, as shown in FIG. 5B, the tool mounting head 210 is provided with four tool holding portions 241, 242, 243, 244 that are movable in the radial direction at equal intervals. ing.

In the through hole 210a of the tool mounting head 210, a rotary shaft 220 is provided on the axis C, and a bearing 252 is provided.
It is rotatably supported by. This rotating shaft 220
Similarly to the rotating shaft 120 of the previous embodiment, the movement of the shaft is restricted by a nut or the like, and the rear end (not shown) has a control shaft 11 (see FIG. 1) in the main shaft 10.
To engage with.

At the front end of the rotary shaft 220, a shaft 231 is provided on an axis C'which is eccentric from the axis C. And
An eccentric cam 230 is rotatably attached to the shaft 231. In addition, the tool holders 241, 242, 24
A spring 24 is provided between the tool mounting head 210 and the tool mounting head 210.
5 is interposed, and tool holders 241, 242, 24
Sliding contact surfaces 241a to 244 formed on one side of 3, 244
The a is constantly urged in the direction of pressing against the cam surface of the eccentric cam 230. Like the spring 145 of the first embodiment, the spring 245 must have a spring constant that prevents the tool holders 241, 242, 243, 244 from moving easily due to centrifugal force generated during processing.

In the tool holder 200 having the above structure,
When the control shaft 11 is rotated relative to the main shaft 10 (see FIG. 1) to rotate the rotary shaft 220, the eccentric cam 230
Of the tool holders 241, 242, 243, 244
Of the sliding contact surfaces 241a to 244a of the
One of the tools T21 to T24 (for example, the tool T21) is projected to a position where the work W can be processed. At this time, the other tools T22, T23, T24 are
Since it is retracted to the position where it does not interfere with the work W, this enables the work W to be machined by the single tool T21.

In this embodiment, more tools T21 to T than the tool holder 100 of the first embodiment described above are used.
24 can be movably held by the tool holder 200. Therefore, it is advantageous in that more types of machining can be performed without exchanging the tool holder 200. Further, since the eccentric cam 230 is used, the total length of the tool mounting head 210 can be made shorter than that of the tool mounting head 110 of the tool holder 100 of the first embodiment.

Furthermore, the tool holder 200 of this embodiment
In the above, it is also possible to hold five or more tools in the tool holder 200 so as to be movable back and forth. Further, a plurality of eccentric cams 230 are arranged in the same direction as the axis C, and each eccentric cam 2 is
By providing multiple tools for each 30 to move back and forth,
It is also easy to provide more tools in one tool holder so that they can move back and forth.

[Third Embodiment] Next, a third embodiment of the tool holder of the present invention will be described with reference to FIGS. 6 and 7. In the above first and second embodiments,
In the radial direction of the tool holders 100, 200, tools T1, T21
~ T24 is configured to move forward and backward. In the third embodiment, the tool T32 is configured to move back and forth in the same direction as the axis C.

FIG. 6 is a sectional view of the tool holder according to the third embodiment, showing the front end portion thereof. The tool holder 300 includes a through hole 310a of the tool mounting head 310.
A rotary shaft 320 rotatably supported by a bearing 352 and a moving body 330 having a screw hole 331 screwed into a screw shaft 321 at the front end of the rotary shaft 320 are provided therein.

Also in this embodiment, the rotating shaft 320
In the same manner as in the first and second embodiments, the movement in the front-rear direction is restricted and the rear end engages with the front end of the control shaft 11 (see FIG. 1) in the main shaft 10. It has become. The rotating shaft 32 is provided in front of the through hole 310a.
A moving body 330 having a screw hole 331 that is screwed into a 0 screw shaft 321 is inserted so as to be movable back and forth. This moving body 330, like the moving body 130 of the first embodiment,
Rotation in the through hole 310a is restricted by a key or the like,
It is adapted to rotate integrally with the tool holder 300 when the work is processed.

In the tool holder 300 having the above structure,
A tool T31 for cutting is attached to the outer peripheral surface of the tool attachment head 310, and a tool T32 such as a drill or a tap that is a rotary tool is attached to a movable body 330 that can move back and forth in the same direction as the axis C. . The tool T32 causes the tool mounting head 310 to move when the moving body 330 moves back and forth.
The storage position (the position shown by the solid line in FIG. 6) stored in the through hole 310a and the forward projection from the through hole 310a,
The workpiece W is moved forward and backward with respect to a projecting position (shown by an imaginary line) where machining is possible.

Next, an example of machining using the tool holder 300 of this embodiment will be described with reference to FIG. FIG. 7 is a diagram showing an example of work machining using the tool holder 300 described above. In the following description, the tool mounting head 3
After forming a hole Wa having a predetermined diameter in the work W with a tool T31 such as a cutting tool attached to the outer peripheral surface of the hole 10, a hole W which is a lower hole such as a screw hole is formed at the bottom of the hole Wa with a tool T32 such as a drill.
The processing of b shall be performed.

Before the hole drilling of FIG. 7A is started using the tool T31, the control shaft 11 (see FIG. 1) and the rotary shaft 32 are used.
0 is rotated relative to the main shaft 10 (see FIG. 1) to retract the moving body 330, and the tool T32 is inserted into the through hole 31.
It is stored in 0a. This prevents the tool T32 and the work W from interfering with each other during the hole drilling by the tool T31. The tool T32 is inserted into the through hole 310a of the tool holder 300.
After being stored therein, the speed of the control shaft 11 is adjusted to rotate the control shaft 11 synchronously with the main shaft 10. As a result, the tool T32 is held in the through hole 310a.

In this state, the tool holder 300 is moved in the same direction as the axis C, and a hole is drilled by the tool T32.
After the hole processing is completed, as shown in FIG. 7B, the tool holder 300 is moved in the same direction as the axis C and separated from the work W. Then, in this state, the control shaft 11 and the rotary shaft 320 are relatively rotated with respect to the main shaft 10 at a predetermined speed difference, and the tool T32 is moved together with the moving body 330 to the tool holder 3.
00 from the front end. When the tool T32 protrudes by a predetermined length, the control shaft 11 is synchronously rotated with respect to the main shaft 10 to hold the position of the tool T32. As a result, it becomes possible to machine the workpiece W with the tool T32.

As shown in FIG. 7C, the tool holder 300 is moved toward the workpiece W in the same direction as the axis C, and the tool T32 forms a hole Wb at the bottom of the hole Wa. As described above, the tool holder 300 of this embodiment can hold not only a tool such as a cutting tool but also a rotary tool such as a drilling tool, and can hold various types of cutting, drilling, screw hole drilling, and the like. There is an advantage that machining can be performed without exchanging the tool holder.

The tool holder 3 of the third embodiment is also used.
00 and the tool holder 100 of the first embodiment are combined to enable more complex machining. That is, a cam portion similar to the tool holder 100 of the first embodiment is formed on the moving body 330 of the tool holder 300, and a tool holding body similar to the tool holding body 140 is provided in a direction traversing the tool mounting head 310. By providing the body, the tool T32 such as a rotary tool and the tool T1 such as a cutting tool can be alternately projected and retracted with respect to the work W to perform processing.

Although the preferred embodiment of the present invention has been described, the present invention is not limited to the above embodiment. A machine tool equipped with the tool holder of the present invention,
As long as it has a control shaft capable of performing synchronous rotation or relative rotation with respect to the main shaft like a U-axis control mechanism, it may be a vertical type that supports the main shaft in the vertical direction,
It may be a horizontal type that horizontally supports the main shaft.

Further, the tool holders 100, 20 of the present invention
At 0,300, the tool mounting head 110 is shown in FIG.
As shown in FIGS. 5 and 6, the bolts 111, 211, 3
It is preferable that the holder 11 be detachably attached to the holder main body 150. By doing so, the holder main body 150 of the tool holder 100, 200, 300 of the present invention,
Pullstat 170 and rotating shafts 120, 220, 320
Can be shared with a U-axis tool holder used in a machine tool having a U-axis function. And bolt 11
Loosen 1, 211, 311 to attach tool mounting heads 110, 2
By removing 10, 310 from the holder body 150,
The tool holders 100, 200, 300 of the present invention can be easily U-shaped.
It can be switched to a shaft tool holder.

Further, in the above description, the sensors 10b, 1
Although the synchronization and relative rotation of the rotations of the control shaft 11 and the spindle 10 are controlled by 1b, for example, the synchronization of the control shaft 11 and the spindle 10 or The relative rotation may be controlled.

Furthermore, in the above description, different types of tools are held in the tool holder and a plurality of types of machining are performed on the workpiece while switching between these tools, but the same tool is held in the tool holder. Then, the machining may be performed while switching these tools in the same machining process. That is, when one tool reaches the end of its service life, by switching to another tool of the same type and continuing machining, continuous machining can be performed for a longer time than before.

In the above description, the axis C of the main shaft 10
And the tool holders 100, 200, and 300 are provided in the tool holders 100, 200, and 300, and the axes of the rotating shafts 120, 220, and 320 are located on the same line. It can also be applied to a tool holder that is bent like a circle. In this case, the rotation of the control shaft 11
It is preferable to use a bevel gear or the like for transmission to the rotary shaft.

Further, in the first and second embodiments, the tool holder 14 is provided by the springs 145 and 245.
Although 0 and 240 are biased to one side, the tool holders 140 and 240 may be biased to one side by a cam that interlocks with the moving body 130 and the eccentric cam 230.

[0055]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the tool holder can be replaced for single or plural machining while properly using the same type or different types of tools held by the tool holder. You can do it without doing it. Therefore, the processing time of the work can be shortened and the processing cost can be reduced.

Further, while the work is being processed by one tool, the other tools are stored at positions where they do not interfere with the work, and when the work is processed by the other tool, the other tool does not move the work. Since it projects to a position where machining is possible, one tool holder can be used for machining a wide variety of workpieces, and a tool holder excellent in versatility can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a tool holder according to a first embodiment of the present invention.

2 (a) is a sectional view taken along the line II of FIG. 1, and FIG. 2 (b) is FIG.
11 is a sectional view taken along line II-II of FIG.

FIG. 3 is a block diagram illustrating an outline of a drive mechanism for synchronizing or relatively rotating a control shaft with respect to a main shaft.

FIG. 4 is a diagram showing an example of machining using the tool holder according to the first embodiment.

5A is a vertical sectional view of a front end portion of a tool holder according to a second embodiment of the present invention, and FIG. 5B is a sectional view taken along line III-III of the tool holder in FIG.

FIG. 6 is a vertical sectional view of a front end portion of a tool holder according to a third embodiment of the present invention.

FIG. 7 is a diagram showing an example of machining using the tool holder according to the third embodiment.

[Explanation of symbols]

10 spindles 11 control axis 100 tool holder 110 Tool mounting head 120 rotation axis 130 mobile 140 Tool holder 150 holder body 170 Pullstat T tool

Continued front page    F-term (reference) 3C016 FA27                 3C046 LL04 LL07

Claims (9)

[Claims] 1. A machine tool having a main shaft, a rotatable control shaft inserted through a through hole of the main shaft, and drive control means for synchronously and relatively rotating the main shaft and the control shaft. In the tool holder mounted on the spindle of the tool for holding a tool for machining a work, the tool holder can hold a plurality of different or the same kind of tools, and at least one of the plurality of tools is A tool holding body that holds the work piece forward and backward between a retracted position that does not interfere with the work piece while the work piece is being machined by the tool and a projecting position where the work piece can be machined; And a conversion means for converting the rotation of the control shaft into a forward / backward movement of the tool holder when the control shaft is engaged and rotates relative to the main shaft. . 2. The converting means is rotatably supported in the tool holder, and is formed on the tool holder, and the rotary shaft is engaged with the control shaft in a disengageable manner. The tool holder according to claim 1, further comprising a screw hole for moving the tool holder forward and backward by the rotation of the rotary shaft. 3. The tool holder according to claim 2, wherein the tool held by the tool holder is a rotary tool, and the other tools held by the tool holder are cutting tools. 4. The conversion means has a rotary shaft rotatably supported in the tool holder and engaged with the control shaft in a disengageable manner, and a screw hole screwed with the rotary shaft. It has a moving body that moves back and forth in the same direction as the axis of the rotating shaft, and second converting means that converts the moving back and forth of this moving body into the moving back and forth of the tool holder in a direction intersecting the axis of the rotating shaft. The tool holder according to claim 1, wherein: 5. The second conversion means has an inclined surface formed on the movable body, and an inclined surface formed on the tool holder and slidably contacting the inclined surface of the movable body. The tool holder according to claim 4. 6. A rotary shaft, wherein the converting means is rotatably supported in the tool holder and engages with the control shaft in a disengageable manner, and a rotary shaft provided on the rotary shaft and constantly connected to the tool holder. And an eccentric cam that operates.
Tool holder described in. 7. The tool holder according to claim 6, wherein a plurality of the tool holders are provided around the eccentric cam. 8. The tool holder according to claim 1, wherein the machine tool has a radial cutting function. 9. The tool holder includes a tool mounting head for mounting a tool, a holder body to which the tool mounting head is detachably mounted, and which is mounted on a spindle of the machine tool, and which engages with the control shaft. 9. The tool according to claim 8, further comprising a rotary shaft that transmits rotation of the control shaft, wherein the holder main body and the rotary shaft are shared with a tool holder having a radial cutting function. holder.