JP2023086148A - Workpiece deformation correcting device and machine tool - Google Patents

Abstract

To provide a workpiece deformation correcting device that can correct workpiece deformation, and to provide a machine tool.SOLUTION: A workpiece deformation correcting device is included in a machine tool. The machine tool includes: a first spindle for holding a workpiece W; a B axis turning tool holding part 45B for holding an end mill 46d1 for machining a workpiece W held on the first spindle; and a first tool movement mechanism for moving the B axis turning tool holding part 45B relative to a workpiece W. The workpiece deformation correcting device includes a pusher 48 for correcting deformation of a workpiece W by pushing the workpiece W held on the first spindle.SELECTED DRAWING: Figure 5

Description

The present invention relates to a workpiece deformation correcting device and a machine tool.

For example, the machine tool described in Patent Literature 1 processes a workpiece held by a spindle with various tools.
Further, for example, Patent Document 2 discloses that a slit is formed in a cylindrical collet chuck main body.

Japanese Patent Application Laid-Open No. 2020-062705 Japanese Patent No. 2887657

In the configuration described in Patent Document 1, the workpiece held by the spindle undergoes plastic deformation due to various causes. The various causes include internal strain of the work material itself, processing strain generated in the work during processing, processing heat generated in the work due to friction with a tool during processing, and the like. As an example, as described in Patent Document 2, when a cylindrical work is slit, the work is plastically deformed so as to warp radially outward. Due to such plastic deformation of the work, there have been problems such as, for example, a decrease in shape accuracy of the work after processing and difficulty in transferring the work between the two spindles.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a work deformation correcting device and a machine tool capable of correcting the deformation of a work.

In order to achieve the above object, a work deformation correcting device according to a first aspect of the present invention comprises a main shaft for holding a work, a tool holding section for holding a tool for processing the work held by the main shaft, and a tool for machining the work held by the main shaft. A work deformation correcting device provided in a machine tool having a moving mechanism for moving a holding part relative to the work, the work deformation correcting device comprising a pusher for correcting deformation of the work by pushing the work held by the main shaft.

In order to achieve the above object, a machine tool according to a second aspect of the present invention includes the workpiece deformation straightening device, the spindle, the tool holder, and the moving mechanism.

According to the present invention, deformation of the work can be corrected.

1 is a front view of a machine tool according to one embodiment of the present invention; FIG. 1 is a plan view of a machine tool according to one embodiment of the present invention; FIG. It is a side view of a machine tool concerning one embodiment of the present invention. 1 is a partially enlarged plan view of a machine tool according to an embodiment of the present invention; FIG. (a) to (f) are schematic diagrams showing operations during machining of a workpiece according to one embodiment of the present invention. (a) to (f) are schematic diagrams showing operations during machining of a workpiece according to one embodiment of the present invention. It is the side view which expanded partially the machine tool based on the modification of this invention.

A workpiece deformation correcting device and a machine tool according to an embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, a machine tool 1 which is a lathe includes a bed S which is a base of the machine tool 1, a first spindle unit 10 having a first spindle 11, and a second spindle unit 10 having a second spindle 21. Spindle unit 20, first spindle moving mechanism 13Z, second spindle moving mechanisms 25X, 25Z, first tool moving mechanisms 42X, 42Y, second tool moving mechanism 27Y, first tool unit 45, second A tool unit 26, a guide bush 18, and a control section 300 are provided.
Hereinafter, the axial direction along the rotation axes of the first main shaft 11 and the second main shaft 21 is defined as the Z-axis direction, the height direction orthogonal to the Z-axis direction is defined as the Y-axis direction, and the Y-axis direction and the Z-axis direction are defined as the Y-axis direction. The depth direction orthogonal to the direction is defined as the X-axis direction.

As shown in FIG. 1, the first spindle unit 10 rotates the work W while holding it. Specifically, the first spindle unit 10 includes a first spindle 11 and a first headstock 12 that rotatably supports the first spindle 11 . The first spindle 11 grips one end of the workpiece W. As shown in FIG. The first headstock 12 incorporates a work rotation motor (not shown) for rotating the first spindle 11 .
The guide bush 18 is provided at a position facing the first main shaft 11 in the Z-axis direction, and rotatably supports the work W held by the first main shaft 11 from the surroundings. The guide bush 18 is fixedly provided on the bed S. A portion of the workpiece W held by the first spindle 11 that protrudes from the guide bush 18 toward the second spindle 21 is machined by the first tool unit 45 .

As shown in FIG. 2, the second spindle unit 20 is provided at a position capable of facing the first spindle unit 10 via the guide bush 18 in the Z-axis direction, and holds the workpiece W received from the first spindle unit 10. while rotating. The second spindle unit 20 includes a second spindle 21 that grips the other end of the workpiece W, a second headstock 22 that rotatably supports the second spindle 21 , and a drill holder 28 . The second headstock 22 incorporates a work rotation motor (not shown) that rotates the second spindle 21 .

As shown in FIG. 4 , the drill holder 28 holds a plurality of tools 29 a and 29 b and is attached to the second headstock 22 so as to be movable together with the second headstock 22 . The drill holding portion 28 holds a plurality of tools 29a and 29b on the side of the second spindle 21 in the X-axis direction (the side far from the second tool unit 26). The drill holding portion 28 holds a plurality of tools 29a and 29b so as to extend along the Z-axis direction and line up in the X-axis direction. The tool 29 a is a drill for forming deep holes, and is used to form deep holes in the work W held by the first spindle 11 . Tool 29b is a finishing reamer for trimming the hole formed by tool 29a.

As shown in FIG. 1, the first spindle moving mechanism 13Z moves the first spindle unit 10 in the Z-axis direction. The second spindle moving mechanism 25Z moves the second spindle unit 20 in the Z-axis direction. The first tool moving mechanism 42Y moves the first tool unit 45 in the Y-axis direction.
As shown in FIG. 2, the second spindle moving mechanism 25X moves the second spindle unit 20 in the X-axis direction so that it can face the guide bush 18 and the second tool unit 26, respectively. The first tool moving mechanism 42X moves the first tool unit 45 in the X-axis direction. The second tool moving mechanism 27Y moves the second tool unit 26 in the Y-axis direction.
The first spindle moving mechanism 13Z, the second spindle moving mechanisms 25X, 25Z, the first tool moving mechanisms 42X, 42Y, and the second tool moving mechanism 27Y each have a motor, a ball screw, a nut, and the like.

As shown in FIG. 3, the first tool unit 45 includes a gate member 45g, tool holding portions 45L and 45R, a B-axis turning tool holding portion 45B, a cross drill holding portion 45C, a plurality of tools 46a, 46b, 46c, 46d, 46e and a pusher 48 are provided.
The gate member 45g is formed in a frame shape surrounding the outer periphery of the work W held by the first spindle 11. As shown in FIG. The gate member 45g is configured to be movable in the X-axis direction and the Y-axis direction by the first tool moving mechanisms 42X and 42Y. Tool holding portions 45L and 45R, a B-axis turning tool holding portion 45B, and a cross drill holding portion 45C are fixed to the gate member 45g.

The tool holding portions 45L and 45R are arranged so as to sandwich the workpiece W held by the guide bush 18 from the X-axis direction. The tool holding portion 45L is positioned closer to the second tool unit 26 than the tool holding portion 45R in the X-axis direction.

The tool holding portion 45L holds a plurality of tools 46a and pushers 48. As shown in FIG. Each tool 46a is a stationary tool such as a cutting tool. The pusher 48 is used to correct deformation of the work W. As shown in FIG. The tool holding part 45L is a gang tool post, and holds a plurality of tools 46a and pushers 48 so as to extend along the X-axis direction and line up in the Y-axis direction. The pusher 48 is made of resin such as nylon, especially MC (monomer cast) nylon. The pusher 48 is, for example, formed in a prismatic shape like the tool 46a. As shown in FIG. 4, the pusher 48 has a pressing surface 48a that presses the workpiece W. As shown in FIG. Both corners in the Z-axis direction of the pressing surface 48a are curved. This prevents the pusher 48 from damaging the workpiece W. As shown in FIG.

The tool holding portion 45R holds a plurality of tools 46b. Each tool 46b is a stationary tool such as a cutting tool. The tool holding part 45R is a gang tool rest, and holds a plurality of tools 46a extending along the X-axis direction and arranged in the Y-axis direction.

The cross drill holding portion 45C is positioned above the tool holding portion 45L and is positioned to face the B-axis turning tool holding portion 45B in the X-axis direction. The cross drill holder 45C holds a plurality of tools 46c. The plurality of tools 46c are tools such as drills or end mills. The cross drill holding portion 45C holds a plurality of tools 46c so as to extend along the X-axis direction and line up in the Y-axis direction. 45 C of cross drill holding|maintenance parts are provided with drive part 45C1, such as a motor, and rotate the attached tool 46c with the driving force of drive part 45C1.

The B-axis turning tool holding portion 45B is positioned above the tool holding portion 45R. The B-axis rotating tool holder 45B includes a rotating tool post 45B1 that holds a plurality of tools 46d and 46e, and a drive unit 45B2 such as a motor that rotates the rotating tool post 45B1 around the rotation axis B. Tools 46d and 46e are tools such as drills or end mills. The rotation axis B extends along the Y-axis direction. The swivel tool post 45B1 extends in a direction perpendicular to the rotation axis B and holds a plurality of tools 46d and 46e so as to line up in the Y-axis direction. The plurality of tools 46d and the plurality of tools 46e are held by the turning tool post 45B1 so that the blade edges face opposite sides.
As shown in FIG. 3, when the swivel angle of the swivel tool post 45B1 is 90°, the cutting edges of the tools 46d face the X-axis direction. At this time, the tool 46d can be brought into contact with the work W from the X-axis direction for processing.
Further, as shown in FIG. 1, when the swivel angle of the swivel tool post 45B1 is 0°, the cutting edges of the tools 46d and 46e face the Z-axis direction. At this time, the tool 46d can be brought into contact with the workpiece W held by the first main spindle 11 from the Z-axis direction for machining. At this time, the tool 46e can be brought into contact with the workpiece W held by the second main spindle 21 from the Z-axis direction for machining.
As shown in FIG. 4, one of the plurality of tools 46d is an end mill 46d1 for slitting, which will be described later.

As shown in FIGS. 2 and 3, the second tool unit 26 processes the workpiece W gripped by the second spindle 21 and is configured to be movable in the Y-axis direction by the second tool moving mechanism 27Y.
The second tool unit 26 includes a plurality of tools 26a and a tool holder 26b that holds the plurality of tools 26a. A plurality of tools 26a extend along the Z-axis direction and are arranged in the X-axis direction and the Y-axis direction. The cutting edge of the tool 26a faces away from the first spindle 11 in the Z-axis direction. By moving the second tool unit 26 in the Y-axis direction, any one of the plurality of tools 26a arranged in the Y-axis direction can be selectively used for machining. Further, by moving the second spindle 21 in the X-axis direction, any one of the plurality of tools 26a arranged in the X-axis direction can be selectively used for machining.

As shown in FIGS. 1 and 2, the control unit 300 includes a first spindle unit 10, a second spindle unit 20, a first spindle moving mechanism 13Z, second spindle moving mechanisms 25X and 25Z, a first tool moving mechanism 42X, 42Y and the second tool moving mechanism 27Y are controlled. The control unit 300 includes, for example, a processing unit such as a CPU (Central Processing Unit) (not shown) and a memory such as a ROM (Read Only Memory) that stores a program defining the procedure of processing by the processing unit. The control unit 300 includes a correction processing unit 301 that performs correction processing for correcting deformation of the work W held by the first spindle 11 . The pusher 48 and the correction processing unit 301 constitute a workpiece deformation correction device.

Next, processing performed by the control unit 300 will be described. The control unit 300 executes this processing according to an NC (Numerical Control) program created in advance. Correction processing by the correction processing unit 301 is executed as part of the NC program. In this NC program, the workpiece W is machined into a thin cylindrical shape and further machined so as to form a plurality of slits in the circumferential direction. The workpiece W is made of, for example, a titanium-based material and used for medical products.

The control unit 300 holds a cylindrical work W supplied from the outside by the first main shaft 11 and axially rotates the work W together with the first main shaft 11 while being supported by the guide bush 18 . Then, the end face of the work W held by the first spindle 11 is machined by the cutting bit, which is the tool 46b held by the tool holding portion 45R, so that the end face of the work W is faced.
Next, the control unit 300 moves the turning tool post 45B1 via the first tool moving mechanisms 42X and 42Y in a state where the turning angle of the turning tool post 45B1 is set to 0° (see FIG. 1) so that a plurality of After forming a center hole in the end face of the work W with any of the center hole forming tools of the tools 46d, a pilot hole is formed in the end face of the work W with any of the plurality of tools 46d. .

Then, the control unit 300 moves the drill holder 28 together with the second spindle unit 20 via the second spindle moving mechanisms 25X and 25Z as indicated by the arrow J1 in FIG. The cutting edge of the tool 29a is made to face the end face of the work W. As shown in FIG. After that, the control unit 300 moves the tool 29a toward the work W in the Z-axis direction via the second spindle movement mechanism 25Z to form a deep hole in the work W. As shown in FIG. Thereby, the workpiece W is processed into a cylindrical shape. Next, similarly to this, the control unit 300 moves the drill holding part 28 via the second spindle moving mechanisms 25X and 25Z, and finishes the deep hole with the tool 29b held by the drill holding part 28. .

Then, the control unit 300 stops the rotation of the first spindle 11 and sets the rotation angle of the first spindle 11 holding the work W to 0°. Further, the turning angle of the turning tool post 45B1 is set to 90° (see FIG. 3), and the turning tool post 45B1 is moved via the first tool moving mechanisms 42X and 42Y, and the end mill 46d1 is moved as shown in FIG. 5(a). toward the workpiece W in the X-axis direction.
Then, in this example, the control unit 300 controls a plurality of (this example Then, the processing areas H1, H2, H3, and H4 are sequentially slotted, and the correction processing section 301 performs the slotting on each of the processing areas H1, H2, H3, and H4. Correction processing is performed in which the pushers 48 push the most recently machined ranges H1, H2, H3, and H4.
First, processing and correction to the processing range H1 will be described.
As shown in FIG. 5(b), the work W is fed in the Z-axis direction toward the end mill 46d1 while rotating the end mill 46d1, so that the working range H1 of the work W is slotted. A slit is formed at one place in the circumferential direction of the workpiece W by this slitting process. The machining range H1 is an area set in the axial direction of the work W, and is set on the end surface side of the work W (right side in FIG. 5(b)).

Next, the control unit 300 rotates the first main spindle 11 by 180°, and performs slotting on the machining range H1 of the work W, as shown in FIG. 5C, in the same manner as described above. When this slitting is completed, the first spindle 11 is rotated by 90° as shown in FIG. 5(d). By this slitting process, two slits are formed in the workpiece W at positions 180° apart in the circumferential direction, and the workpiece W is divided into two parts P1 and P2 in the circumferential direction in the machining range H1. At this time, warpage, which is plastic deformation, occurs in the working range H1 of the workpiece W. As shown in FIG. That is, the two portions P1 and P2 of the work W are warped away from the central axis of the work W toward the end face of the work W. As shown in FIG.

Next, the correction processing unit 301 performs correction processing for correcting the warpage of the work W by pushing the processing range H1 of the work W with the pusher 48 .
Specifically, the correction processing section 301 moves the tool holding section 45L via the first tool moving mechanisms 42X and 42Y, and as shown in FIG. Push the push amount toward the central axis of the . This pushing amount is set based on the position of the outer peripheral surface of the work W that is free of warp. Before the pusher 48 pushes the work W, the position of the pusher 48 with respect to the work W is adjusted by feeding the work W with respect to the pusher 48 in the Z-axis direction. In this example, the pressing surface 48a of the pusher 48 presses the end of the machining range H1 on the guide bush 18 side (left side in FIG. 5(e)). As a result, the pushing amount of the pusher 48 can be reduced. Thus, the correction of the portion P2 of the work W is completed. Next, in correcting the portion P1 of the work W, the correction processing section 301 first rotates the first main shaft 11 by 180° so that the pusher 48 faces the portion P1 of the work W. As shown in FIG. Then, similarly to the correction of the portion P2 of the work W described above, the portion P1 of the work W is corrected by the pusher 48 as shown in FIG. 5(f). With the above, the correction processing for the processing range H1 is completed.

After the processing range H1 is processed and corrected, processing ranges H2, H3, and H4 are processed and corrected in order in the same manner as the processing range H1. Specifically, in order to machine the machining range H2, the workpiece W is first fed in the Z-axis direction so that the machining range H2 protrudes from the guide bush 18, as shown in FIG. 6(a). Then, slotting is performed on the machining range H2 of the workpiece W so as to deepen one slit in the machining range H1 of the workpiece W in the Z-axis direction. Rotate 180°. The machining range H2 is set in a range adjacent to the machining range H1. Then, as shown in FIG. 6B, slotting is similarly performed on the machining range H2 of the workpiece W so as to deepen the other slit in the machining range H1 of the workpiece W. As shown in FIG. As a result, the workpiece W is warped due to the slitting of the machining range H2. Therefore, as shown in FIG. 6C, the portion P2 of the work W is pushed by the pusher 48 to correct the warpage of the portion P2, and as shown in FIG. The warping of the portion P1 is corrected by pressing at 48. - 特許庁
Next, slotting is performed on the machining range H3 in the same manner as the machining ranges H1 and H2. Specifically, in order to machine the machining range H3, the workpiece W is fed in the Z-axis direction so that the machining range H3 protrudes from the guide bush 18, as shown in FIG. 6(e). Then, after slotting is performed in order on both sides of the working range H3 of the work W, the warpage of the work W is corrected by pushing both the parts P2 and P1 of the work W in order with the pusher 48. .
Then, slotting is performed on the machining range H4 in the same manner as the machining ranges H1, H2, and H3. Specifically, in order to machine the machining range H4, the workpiece W is fed in the Z-axis direction so that the machining range H4 protrudes from the guide bush 18, as shown in FIG. 6(f). Then, after slitting is performed on both sides of the working range H4 of the work W in order, the warp of the work W is corrected by pushing both the parts P2 and P1 of the work W in order with the pusher 48. .
Processing and correction of the processing ranges H1, H2, H3, and H4 are thus completed.

When the machining and correction of the machining ranges H1, H2, H3, and H4 are completed, the control unit 300 moves the second spindle 21 through the second spindle moving mechanisms 25X and 25Z so that the second spindle 21 faces the first spindle 11. The spindle unit 20 is moved in the X-axis direction and the Z-axis direction. The control unit 300 transfers the workpiece W from the first spindle 11 to the second spindle 21 . At this time, since the work W has been corrected, the work W can be reliably transferred. Specifically, the control unit 300 cuts the work W with the parting bit, which is the tool 46a of the tool holding unit 45L, while the work W is being rotated while being held by the first main spindle 11 and the second main spindle 21. do. As a result, it becomes possible to hold a cylindrical workpiece W having two slits cut off from the second main shaft 21 .

Next, the control unit 300 processes the work W held by the second spindle 21 using the tool 46e held by the second tool unit 26 or the swivel tool post 45B1. When this machining is completed, the control unit 300 discharges the work W from the second spindle 21 to a work separator (not shown).
With the above, the processing process ends. This machining process is performed each time the workpiece W is machined.

(effect)
According to the embodiment described above, the following effects are obtained.
(1) The machine tool 1 is equipped with a workpiece deformation correcting device. The machine tool 1 is an example of a tool holder that holds a first spindle 11 that is an example of a spindle that holds a work W, and an end mill 46d1 that is an example of a tool for processing the work W held by the first spindle 11. A B-axis turning tool holding portion 45B and first tool moving mechanisms 42X and 42Y, which are examples of moving mechanisms for moving the B-axis turning tool holding portion 45B with respect to the workpiece W, are provided. The work deformation correcting device includes a pusher 48 that corrects deformation of the work W by pushing the work W held by the first spindle 11 after the work W has been machined by the end mill 46d1.
According to this configuration, the pusher 48 can correct the deformation of the workpiece W caused by the various causes described above. Thereby, the shape accuracy of the workpiece W can be enhanced. In addition, transfer of the workpiece W between the first spindle 11 and the second spindle 21 becomes smooth. In particular, the parting off process can be reliably performed while the workpiece W is held between the first main spindle 11 and the second main spindle 21 .

(2) The machine tool 1 includes a gate member 45g which is an example of a support base that supports the B-axis turning tool holding section 45B and is moved together with the B-axis turning tool holding section 45B by the first tool moving mechanisms 42X and 42Y. . The pusher 48 is movably provided together with the gate member 45g.
According to this configuration, since the first tool moving mechanisms 42X and 42Y are used to move the pusher 48, a moving mechanism unique to the pusher 48 is not required, and a simple configuration can be realized. Also, the cost can be reduced.

(3) The pusher 48 is held by the tool holding portion 45L. After machining the workpiece W by the end mill 46d1, the workpiece deformation correcting device moves the pusher 48 via the first tool moving mechanisms 42X and 42Y, and presses the workpiece W by a preset amount of push. A correction processing unit 301 is provided for performing correction processing for correcting deformation of the work W caused by the deformation.
According to this configuration, as a mechanical configuration, it is only necessary to attach the pusher 48 to the tool holding portion 45L. Therefore, the installation work is simple, and it is easy to retrofit the work deformation correcting device to an existing machine tool. .
Further, as in the above case, the pusher 48 does not require a movement mechanism unique to it, so that a simple configuration and cost reduction can be achieved.
Furthermore, the amount of push of the pusher 48 can be easily and freely set by setting the amount of movement of the first tool moving mechanisms 42X and 42Y.

(4) The first tool moving mechanisms 42X and 42Y perform machining (for example, slotting) on each of a plurality of machining ranges H1, H2, H3, and H4 set along the axial direction of the workpiece W in order. The correction processing unit 301 performs correction processing in which the pushers 48 push the ranges H1, H2, H3, and H4 that have been processed most recently after each processing.
According to this configuration, even when the work W is processed over a long range, the work W can be processed and corrected with higher accuracy.

(5) The first tool moving mechanisms 42X and 42Y perform slotting on the work W held by the first main spindle 11 with the end mill 46d1. After the slitting process, the straightening processing unit 301 performs a straightening process for straightening the workpiece W warped by the slitting process.
According to this configuration, since the work W is corrected, it is possible to include the slitting of the work W, which is likely to be greatly deformed, in the processing process.

(6) The machine tool 1 includes a workpiece deformation correcting device, a first spindle 11, a B-axis rotating tool holder 45B, and first tool moving mechanisms 42X and 42Y.
According to this configuration, it is possible to include the correction processing of the work W by the work deformation correcting device in the machining process of the machine tool 1 . Therefore, the entire machining process of the workpiece W can be performed by the machine tool 1 alone.

The present disclosure is not limited by the above embodiments and drawings. Changes (including deletion of components) can be made as appropriate without changing the gist of the present disclosure. An example of modification will be described below.

(Modification)
In the above embodiment, the four machining ranges H1, H2, H3, and H4 of the workpiece W are machined and corrected in order, but the number of machining ranges is not limited to four, and may be three or less or five. or more. For example, it is preferable that the longer the workpiece W, the greater the number of machining ranges. In addition, when the workpiece W has a material or shape that is easily deformed by machining, the length of the machining range is preferably set short.
In the above embodiment, the lengths of the machining ranges H1, H2, H3, and H4 are set to be the same, but the lengths are not limited to this, and they may be set to be different.

Although the pusher 48 is made of resin in the above embodiment, it may be made of metal, rubber, or the like other than resin. Alternatively, the main body of the pusher 48 may be made of metal, and only the portion including the pressing surface 48a may be made of resin, rubber, or the like.
In the above-described embodiment, two slits are provided at positions separated by 180° in the circumferential direction of the workpiece W, but the number and positions of the slits can be changed as appropriate.

In the above-described embodiment, the B-axis turning tool holder 45B is configured so that the turning tool post 45B1 can turn around the rotation axis B. However, the present invention is not limited to this, and is fixed to the gate member 45g so as not to turn. may

In the above embodiment, the pusher 48 is held by the tool holding portion 45L, but as long as it can move together with the gate member 45g, the pusher 48 is not limited to this, and can It may be held by the tool holding portion 45R. Also, the pusher 48 may be attached to the gate member 45g.
Further, in the above-described embodiment, the pusher 48 and the end mill 46d1 are arranged on opposite sides of the first main shaft 11 in the X-axis direction, but the arrangement position is not limited to this. For example, both the pusher 48 and the end mill 46d1 may be arranged on one side of the first main shaft 11 in the X-axis direction.

The shape of the pusher 48 in the above embodiment can be changed as appropriate. For example, the pusher 48 may be cylindrical, conical, pyramidal, or the like. Further, the pressing surface 48a of the pusher 48 may be formed in a curved concave shape along the outer peripheral surface of the work W. As shown in FIG.

In the correction process of the above embodiment, the position at which the pusher 48 pushes the workpiece W can be changed as appropriate. For example, the pusher 48 may push the side far from the guide bush 18 in the machining range H1 of the workpiece W, or the pusher 48 may push the central portion of the machining range H1 in the Z-axis direction.

In the above-described embodiment, the work W is deformed to be warped by slitting the cylindrical work W, but the deformation of the work W is not limited to this, and is caused by other factors. can be anything. For example, the workpiece W may be deformed by working pressure, working heat, or internal strain applied to the rod-shaped work held by the first spindle 11, and this deformation may be corrected.

In the above embodiment, the tool holding portions 45L and 45R, the B-axis turning tool holding portion 45B and the cross drill holding portion 45C are configured to be integrally movable by the first tool moving mechanisms 42X and 42Y. A tool holding portion 45L and a cross drill holding portion 45C located on one side in the axial direction (left side in FIG. 3) and a tool holding portion 45R and a B-axis rotating tool holding portion located on the other side in the X-axis direction (right side in FIG. 3). The portion 45B may be configured to be movable in the X-axis direction and the Y-axis direction independently of each other. In this modification, the end mill 46d1 and the pusher 48 may be oriented perpendicular to each other, for example, as shown in FIG. 7, the pusher 48 may be directed in the X-axis direction and the end mill 46d1 may be directed in the Y-axis direction. As a result, after slitting the work W, the work W can be pushed by the pusher 48 without rotating the first spindle 11 . In addition, it becomes possible to perform slotting and straightening of the work W at the same time. In summary, the three steps of slitting, rotation of the first spindle 11, and pressing of the work W by the pusher 48 in the above embodiment can be executed as one step in this modified example.
Furthermore, the tool holding portions 45L, 45R, the B-axis turning tool holding portion 45B, and the cross drill holding portion 45C may be configured to be movable in the Z-axis direction. In this case, the first spindle unit 10 may be configured to be immovable in the Z-axis direction.

In the above embodiment, the pusher 48 is held by the tool holding portion 45L and is movable together with the tools 46a, 46b, 46c, 46d and 46e by the first tool moving mechanisms 42X and 42Y. It may be configured to be movable by a mechanism. As a result, the slitting process and the straightening of the work W can be performed simultaneously.

The timing of pushing the workpiece W with the pusher 48 in the above embodiment can be changed as appropriate. For example, the work W may be pushed by the pusher 48 after the first main shaft 11 is rotated by 90° after slitting the work W at one place in the circumferential direction by slitting. Moreover, the work W may be pushed by the pusher 48 before the work W is processed.
Alternatively, the work W may be pushed by the pusher 48 after the work W is moved in the Z-axis direction so that the pusher 48 contacts the warped portion of the work W.
Furthermore, the guide bush 18 in the above embodiment can be omitted.
In addition, of the tool holding portions 45L and 45R, the B-axis turning tool holding portion 45B, and the cross drill holding portion 45C, the configuration in which the pusher 48 or the end mill 46d1 is not attached may be omitted. That is, in the above embodiment, the tool holding portion 45R and the cross drill holding portion 45C can be omitted.
Also, the second spindle unit 20, the second tool moving mechanism 27Y, and the second tool unit 26 in the above embodiment may be omitted.

DESCRIPTION OF SYMBOLS 1... Machine tool, 10... 1st spindle unit, 11... 1st spindle, 12... 1st headstock, 13Z... 1st spindle movement mechanism, 18... Guide bush, 20... 2nd spindle unit, 21... 2nd spindle , 22... Second headstock, 25X, 25Z... Second spindle movement mechanism, 26... Second tool unit, 26a, 29a, 29b, 46a, 46b, 46c, 46d, 46e... Tools, 26b, 45L, 45R... Tools Holding part 27Y... Second tool moving mechanism 28... Drill holding part 42X, 42Y... First tool moving mechanism 45... First tool unit 45B... B-axis rotating tool holding part 45C... Cross drill holding part 45B1... swivel tool post, 45C1, 45B2... drive part, 45g... gate member, 46d1... end mill, 48... pusher, 48a... pressing surface, 300... control part, 301... correction processing part, B... rotary shaft, H1, H2 , H3, H4... Machining range, P1, P2... Site, S... Bed, W... Work

Claims (6)

Correction of workpiece deformation provided in a machine tool comprising a spindle that holds a workpiece, a tool holding section that holds a tool for processing the workpiece held by the spindle, and a moving mechanism that moves the tool holding section relative to the workpiece a device,
A pusher for correcting deformation of the work by pushing the work held by the spindle;
Work deformation correction device. The machine tool includes a support base that supports the tool holding portion and is moved together with the tool holding portion by the moving mechanism,
The pusher is movably provided together with the support base,
The workpiece deformation correcting device according to claim 1. The pusher is held by the tool holder,
The workpiece deformation correcting device is
After machining the workpiece with the tool, the pusher is moved via the moving mechanism, and the pusher pushes the workpiece by a preset pushing amount, thereby correcting deformation of the workpiece due to machining. A correction processing unit that performs
The workpiece deformation correcting device according to claim 1 or 2. The moving mechanism sequentially processes each of a plurality of ranges set along the axial direction of the workpiece,
After each processing is performed, the correction processing unit performs the correction processing by pushing the most recently processed range with the pusher.
The workpiece deformation correcting device according to claim 3. The moving mechanism performs slotting with the tool on the workpiece held by the spindle,
After the slitting process, the straightening processing unit performs the straightening process of straightening the workpiece warped by the slitting process.
The workpiece deformation correcting device according to claim 3 or 4. a workpiece deformation correcting device according to any one of claims 1 to 5;
the main shaft;
the tool holder;
and the moving mechanism,
Machine Tools.

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