WO2024190634A1 - Tool unit and machine tool - Google Patents

Abstract

A tool unit (100) having a cutting tool capable of forming a cut into a rotating workpiece is provided with: a mounting part (60) configured to be mountable on a tool holding part in a machine tool; a gripping part (70) for gripping the cutting tool; a linear guide (75) for guiding the gripping part (70) so that the gripping part (70) can move relative to the mounting part (60) in a direction parallel to the direction in which the cutting tool forms the cut into the workpiece; and an elastic body provided in the tool unit (100) so as to press the gripping part (70) in the cutting direction.

Description

Tool units and machine tools

This disclosure relates to a tool unit and a machine tool.

There is a demand for technology to form grooves of uniform depth on the surface of a workpiece, which is a material to be cut. With regard to this technology, JP 2011-173191 A (Patent Document 1) discloses a method for manufacturing a roll mold used in the manufacture of optical films.

The manufacturing method includes the steps of "preparing a lathe equipped with a cutting tool, mounting the roll on the lathe, and forming a plurality of grooves arranged in the axial direction of the roll on the surface of the roll by lathe processing, based on the amount of cut that is set according to the amount of wear on the cutting tool caused by the lathe processing" (see paragraph [0009]). In this manufacturing method, the amount of cut into the roll is set according to the amount of wear on the cutting tool, so that variation in the depth of each groove formed in the roll is reduced.

JP 2011-173191 A

The depth of the groove formed on the workpiece surface varies due to a variety of factors, not just the amount of wear on the bit. Therefore, there is a demand for technology that can reduce the variation in the depth of the grooves formed on the workpiece surface in a way that differs from conventional methods.

In one example of the present disclosure, a tool unit having a cutting tool capable of cutting a rotating workpiece is provided. The tool unit includes an attachment section configured to be attached to a tool holder in a machine tool, a gripping section for gripping the cutting tool, a linear guide for guiding the gripping section so that the gripping section can move relatively to the attachment section in a direction parallel to the cutting direction of the cutting tool into the workpiece, and an elastic body provided on the tool unit to press the gripping section in the cutting direction.

In one example of the present disclosure, the tool unit further includes first and second rollers that are provided on the gripping portion so as to sandwich the tool bit. Each of the first and second rollers is provided on the gripping portion so that its rotation axis is perpendicular to the cutting direction.

In one example of the present disclosure, at least one of the first and second rollers is configured so that its position in the cutting direction can be adjusted.

In one example of the present disclosure, the first roller is configured so that its position in the cutting direction can be adjusted, and the second roller is configured so that its position in the cutting direction cannot be adjusted.

In one example of the present disclosure, the elastic body is further provided on the tool unit so as to press the mounting portion in the opposite direction to the cutting direction.

In one example of the present disclosure, the tool holder is a turret.

In one example of the present disclosure, the tool holder is a tool spindle.

In another example of the present disclosure, a machine tool is provided that is configured to be able to mount the above-mentioned tool unit.

The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings.

FIG. 1 is a perspective view showing an example of an internal structure of a machine tool. FIG. 2 is a diagram for explaining an overview of a tool unit. 13 is a diagram showing a state in which a tool unit according to a comparative example is turning a workpiece, as viewed from the X-axis direction. FIG. 11 is a diagram illustrating a state in which the tool unit according to the embodiment is turning a workpiece, as viewed from the X-axis direction. FIG. FIG. 4 is a plan view showing the tool unit from the negative side in the X-axis direction. FIG. 4 is a rear view showing the tool unit from the positive side in the X-axis direction. FIG. 4 is a bottom view showing the tool unit from the negative side in the Y axis direction. 8 is a cross-sectional view of the tool unit taken along line VIII-VIII shown in FIGS. 5 to 7. FIG. FIG. 2 is a diagram illustrating an example of a drive mechanism of a machine tool. FIG. 13 is a diagram showing an example of an internal structure of a machine tool according to a modified example.

Below, each embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts and components are given the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated. Note that each embodiment and each modified example described below may be combined selectively as appropriate.

<A. Machine tools 10>
First, a machine tool 10 according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a perspective view showing an example of the internal structure of machine tool 10.

The term "machine tool" as used in this specification is a concept that includes various devices that have the function of turning a workpiece. The machine tool may be a lathe or other turning machine. Alternatively, the machine tool may be a machining center with a turning function. Alternatively, the machine tool may be a grinding machine, a multi-tasking machine, a five-axis machine, etc. Furthermore, the machine tool is not limited to those that perform only removal processing, but may also be those that perform additional processing in addition to removal processing.

FIG. 1 shows a machine tool 10 as a lathe. The machine tool 10 turns a workpiece by bringing a tool into contact with the rotating workpiece. The machine tool 10 has, for example, a bed 11, a headstock 21, and a tool rest 31.

The bed 11 is a base member for supporting the headstock 21 and tool rest 31, and is installed on the floor of a factory or the like. The bed 11 is made of a metal such as cast iron.

The headstock 21 is attached to the bed 11. The headstock 21 has a work spindle 22 (see FIG. 3) which will be described later. The work spindle 22 is driven to rotate around an axis AX0 which is parallel to the horizontal direction. A chuck mechanism configured to be able to grip a workpiece is provided at the tip of the work spindle 22. The workpiece gripped by the chuck mechanism rotates around the axis AX0 as the work spindle 22 is driven to rotate.

The tool rest 31 is a turret type tool rest. The tool rest 31 is attached to the bed 11 via a saddle 16 and a cross slide (not shown). The saddle 16 is configured to be movable along an axis AX1 that is parallel to the horizontal direction by various feed mechanisms, guide mechanisms, servo motors, etc. The cross slide is configured to be movable along a direction perpendicular to both the axis AX0 and the axis AX1.

The tool rest 31 has a tool rest base 32 and a turret 33. The tool rest base 32 is equipped with a motor for rotating the turret 33, etc.

The turret 33 is provided so as to protrude from the tool rest base 32 in the axial direction of the axis AX1 toward the headstock 21. The turret 33 has a disk shape with its thickness direction being in the axial direction of the axis AX1.

The turret 33 is composed of a rotating part 33A and a support part 33B. The rotating part 33A is configured to be rotatable around the axis AX1. The support part 33B is fixed to the tool rest base 32 and supports the rotating part 33A so that the rotating part 33A can rotate around the axis AX1.

A number of tool holders 40 can be attached to the turret 33. Each tool holder 40 is fastened to the turret 33 using a bolt. In addition, each tool holder 40 is arranged in a line in the circumferential direction around the axis AX1, and is configured to be able to hold a tool.

<B. Overview of the tool unit 100>
Next, a tool unit 100 used in the above-described machine tool 10 will be described with reference to Fig. 2. Fig. 2 is a diagram for explaining an overview of the tool unit 100 according to an embodiment.

In FIG. 2, the above-mentioned turret 33, the tool unit 100, and the workpiece W, which is the material to be cut, are shown from the side. The tool unit 100 has a cutting tool T, an attachment part 60, a gripping part 70, a linear guide 75, and an elastic body 80.

The bit T is a type of turning tool. The bit T turns the workpiece W by being pressed against the rotating workpiece W.

For ease of explanation, the cutting direction of the bit T into the workpiece W will be referred to as the "positive Y-axis direction" below, and the opposite direction will be referred to as the "negative Y-axis direction". The cutting direction is the direction in which the bit T is pressed into the workpiece W, and is perpendicular to the surface of the workpiece W. In addition, when there is no particular distinction between the positive Y-axis direction and the negative Y-axis direction, it will simply be referred to as the "Y-axis direction". Typically, the Y-axis direction is perpendicular to both the rotation axis of the turret 33 and the axial direction of the workpiece spindle 22 described below.

The direction parallel to the rotation axis of the turret 33 is also referred to as the "Z-axis direction." The Z-axis direction is perpendicular to the Y-axis direction. The direction perpendicular to both the Z-axis direction and the Y-axis direction is also referred to as the "X-axis direction."

The mounting part 60 is a part of the tool unit 100, and is configured to be mountable to the turret 33. In this specification, one or more parts that are immovable relative to the turret 33 are referred to as the mounting part 60. The mounting part 60 may be composed of one part or multiple parts. The mounting part 60 is fixed to the turret 33 by being inserted into the turret 33.

The gripping portion 70 is a part of the tool unit 100 and is configured to be able to grip the bit T. In this specification, one or more parts configured to be able to move relative to the mounting portion 60 are referred to as the gripping portion 70. The gripping portion 70 may be configured as one part or as multiple parts. The tool unit 100 turns the workpiece W by pressing the bit T gripped by the gripping portion 70 against the rotating workpiece W.

The linear guide 75 is a mechanism for guiding the gripping part 70 so that the gripping part 70 can move relative to the mounting part 60 in a direction parallel to the cutting direction of the bit T into the workpiece W (i.e., the Y-axis direction). In other words, the linear guide 75 is a mechanism for restricting the relative movement direction of the gripping part 70 with respect to the mounting part 60 in the Y-axis direction. The linear guide 75 may be provided in the mounting part 60 or in the gripping part 70. In other words, the linear guide 75 may be provided between the mounting part 60 and the gripping part 70.

The elastic body 80 is provided in the tool unit 100 so as to press the gripping part 70 to the positive side in the Y-axis direction. As a result, the greater the reaction force that the gripping part 70 receives from the workpiece W during turning of the workpiece W, the more the elastic body 80 contracts, and the gripping part 70 moves to the negative side in the Y-axis direction relative to the mounting part 60. As a result, the force with which the cutting tool T cuts into the workpiece W is less likely to fluctuate, and variation in the depth of the groove formed on the workpiece surface is reduced.

The elastic body 80 can be disposed at any position within the tool unit 100 as long as it is capable of pressing the grip portion 70 in the positive Y-axis direction. In the example of FIG. 2, the elastic body 80 is disposed within the tool unit 100 so as to press the grip portion 70 in the positive Y-axis direction and to press the mounting portion 60 in the negative Y-axis direction. In other words, the elastic body 80 is disposed between the mounting portion 60 and the grip portion 70, and is disposed within the tool unit 100 so as to separate the mounting portion 60 from the grip portion 70.

As another example, the elastic body 80 may be provided between the turret 33 and the mounting part 60. Even in such a case, the reaction force that the tool unit 100 receives from the workpiece W is absorbed by the elastic body 80, and the force with which the cutting tool T cuts into the workpiece W is less likely to fluctuate. As a result, the variation in the depth of the groove formed in the workpiece surface is reduced.

C. Advantages
Next, advantages of the above-mentioned tool unit 100 will be described with reference to Fig. 3 and Fig. 4. Fig. 3 is a diagram showing a state in which a tool unit 100X according to a comparative example is turning a workpiece W from the X-axis direction. Fig. 4 is a diagram showing a state in which the above-mentioned tool unit 100 is turning a workpiece W from the X-axis direction.

In the example shown in Figures 3 and 4, a cylindrical and long workpiece W is held by the workpiece spindle 22 and the tailstock 25.

The work spindle 22 is supported by the above-mentioned headstock 21 (see FIG. 1) so that it can rotate around the Z-axis direction. The work spindle 22 is provided with a chuck mechanism 23. The chuck mechanism 23 is a mechanism for gripping one end of the workpiece W. When the chuck mechanism 23 grips the workpiece W, the workpiece W is fixed to the work spindle 22.

The tailstock 25 (not shown in FIG. 1) is provided in the machine tool 10 so as to face the workpiece spindle 22. As a result, the tailstock 25 supports the workpiece W from the side opposite the workpiece spindle 22. The tailstock 25 is configured to support the center of rotation of the workpiece W.

The workpiece W is composed of a base material WI and a surface layer WS. The surface layer WS is a coating layer formed on the outer peripheral surface of the base material WI. As an example, the surface layer WS is a plating applied to the base material WI. The thickness of the surface layer WS is, for example, 100 μm or less.

There is a need for turning of the above-mentioned workpiece W to form grooves only in the surface layer WS without damaging the base material WI. The depth of the groove formed in the surface layer WS can vary due to various factors. Such factors include, for example, runout of the chuck mechanism 23, wear of the cutting tool T, runout of the cylinder (not shown), and unevenness of the surface layer WS. The above-mentioned tool unit 100 is not affected by these factors and can suppress variation in the depth of the grooves formed.

An example in which the variation is suppressed will be described with reference to Figures 3 and 4. In the example of Figures 3 and 4, the gripping points of the work spindle 22 and the tailstock 25 are eccentric, so the work W is slightly tilted with respect to the Z-axis direction. Note that for ease of explanation, the tilt of the work W with respect to the Z-axis direction is exaggerated in the example of Figures 3 and 4.

The examples in Figures 3 and 4 show the tool units 100 and 100X being driven in the Z-axis direction while turning the rotating workpiece W. As a result, a spiral groove is formed on the surface of the workpiece.

When the tool unit 100X according to the conventional example moves in the Z-axis direction while maintaining its position in the Y-axis direction, the workpiece W is cut deeper as it moves in the Z-axis direction. As a result, in the example of Figure 3, the tool unit 100X cuts not only the surface layer WS but also the base material WI.

On the other hand, even when the tool unit 100 shown in FIG. 4 moves in the Z-axis direction while maintaining its position in the Y-axis direction, the above-mentioned elastic body 80 absorbs the reaction force received from the workpiece W. As a result, as the tool unit 100 moves in the Z-axis direction, the mounting part 60 moves to the negative side in the Y-axis direction. This makes it difficult for the amount of cutting into the workpiece W to vary, even if the reaction force received by the tool unit 100 from the workpiece W during turning varies. As a result, the tool unit 100 can reduce variation in the depth of the grooves formed on the workpiece surface, and can form grooves only in the surface layer WS.

Note that the turning application of the tool unit 100 is not limited to a workpiece W having a surface layer WS. As an example, the tool unit 100 can also be used in turning processes such as forming grooves on the surface of a workpiece to prevent slipping.

<D. Details of the Tool Unit 100>
Next, the above-mentioned tool unit 100 will be described in more detail with reference to Figures 5 to 8. Figure 5 is a plan view showing the tool unit 100 from one side in the X-axis direction. Figure 6 is a rear view showing the tool unit 100 from the other side in the X-axis direction. Figure 7 is a bottom view showing the tool unit 100 from the negative side in the Y-axis direction. Figure 8 is a cross-sectional view of the tool unit 100 taken along line VIII-VIII shown in Figures 5 to 7.

Below, we will explain the linear guide 75 provided inside the tool unit 100, the elastic body 80 provided inside the tool unit 100, and the rollers 90A and 90B provided inside the tool unit 100 in order.

(D1. Linear guide 75)
First, the linear guide 75 provided inside the tool unit 100 will be described.

As described above, the linear guide 75 is provided on the mounting part 60 or the gripping part 70, and guides the gripping part 70 so that it can move in the Y-axis direction relative to the mounting part 60.

As an example, the linear guide 75 is composed of a rail and a carriage that slides on the rail. The rail is a component that is attached to one of the mounting part 60 and the gripping part 70, and the carriage is a component that is attached to the other of the mounting part 60 and the gripping part 70. The rail is provided to extend in the Y-axis direction. The carriage is attached to move on the rail. This allows the gripping part 70 to move relative to the mounting part 60 in the Y-axis direction. Note that rolling bodies such as balls may be provided between the rail and the carriage.

The linear guide 75 is also provided with stoppers to limit the range of movement of the gripping part 70 in the Y-axis direction to within a certain range. Typically, two stoppers are provided on the linear guide 75. One stopper limits the movement of the gripping part 70 on the positive side of the Y-axis direction, and the other stopper limits the movement of the gripping part 70 on the negative side of the Y-axis direction.

The stopper for limiting the range of movement of the gripping part 70 in the Y-axis direction to a certain range does not necessarily have to be provided on the linear guide 75. The stopper may be provided on the mounting part 60 or the gripping part 70.

(D2. Elastic body 80)
Next, the elastic body 80 provided inside the tool unit 100 will be described.

As described above, the elastic body 80 is provided in the tool unit 100 so as to be expandable and contractible in the Y-axis direction, and is configured to press the mounting part 60 to the negative side in the Y-axis direction and press the gripping part 70 to the positive side in the Y-axis direction. In other words, the elastic body 80 functions as a buffer between the mounting part 60 and the gripping part 70, and absorbs the force that the gripping part 70 receives from the workpiece W when the workpiece W is turned.

As an example, the elastic body 80 is housed in a housing portion 82. The housing portion 82 is a component that constitutes the mounting portion 60. In other words, the housing portion 82 is configured integrally with the mounting portion 60 and is configured to work in conjunction with the mounting portion 60.

Furthermore, a pressed portion 77 is fixed to the gripping portion 70. The pressed portion 77 is a component that constitutes the gripping portion 70. In other words, the pressed portion 77 is configured integrally with the gripping portion 70 and is configured to move in conjunction with the gripping portion 70.

As shown in FIG. 8, one end of the elastic body 80 contacts the pressed portion 77, and the other end of the elastic body 80 contacts the housing portion 82. As a result, the elastic body 80 presses the gripping portion 70 in the positive direction of the Y axis via the pressed portion 77, and presses the mounting portion 60 in the negative direction of the Y axis via the housing portion 82.

The type of elastic body 80 is arbitrary. The elastic body 80 may be a spring, rubber, or other elastic member that can expand and contract when subjected to an external force during turning of the workpiece W.

(D3. Rollers 90A, 90B)
Next, the rollers 90A, 90B provided inside the tool unit 100 will be described.

As shown in Figures 5 to 8, rollers 90A, 90B (first and second rollers) are provided in the gripping portion 70 so as to sandwich the bit T. Below, at least one of the rollers 90A, 90B will also be referred to as roller 90.

The rollers 90 are provided on the underside of the gripping portion 70 on the positive side in the Y-axis direction. The rollers 90 are also provided on the gripping portion 70 so that their rotational axes are perpendicular to the Y-axis direction. In other words, the rotational axis of the rollers 90 is parallel or approximately parallel to the rotational axis of the workpiece W. As a result, the rollers 90 rotate in contact with the workpiece W while the workpiece W is being turned, preventing the bit T from getting caught on the workpiece W during turning.

Preferably, the roller 90 is configured so that its position in the Y-axis direction can be adjusted. That is, the position of the roller 90 in the Y-axis direction can be adjusted relative to the gripping portion 70. This allows the operator to adjust the position of the roller 90 in the Y-axis direction to match the manner in which the workpiece W is being turned.

Any mechanism can be used to adjust the position of the roller 90. As one example, a mechanism for sandwiching a shim between the gripper 70 and the roller 90 is provided on the gripper 70 or the roller 90. An operator can adjust the position of the roller 90 in the Y-axis direction by adjusting the thickness of the shim or the number of shims sandwiched by the mechanism.

In one aspect, roller 90A is configured so that its position in the Y-axis direction can be adjusted. On the other hand, roller 90B is configured so that its position in the Y-axis direction cannot be adjusted.

In another aspect, roller 90A is configured so that its position in the Y-axis direction cannot be adjusted. On the other hand, roller 90B is configured so that its position in the Y-axis direction can be adjusted.

In yet another aspect, both roller 90A and roller 90B are configured so that their positions in the Y-axis direction can be adjusted.

The number of rollers 90 provided in the tool unit 100 is not limited to two. The number of rollers 90 provided in the tool unit 100 may be one, or three or more.

<E. Drive Mechanism of Machine Tool 10>
Next, a drive mechanism in the machine tool 10 will be described with reference to Fig. 9. Fig. 9 is a diagram showing an example of the drive mechanism of the machine tool 10.

As shown in FIG. 9, the machine tool 10 includes a headstock 21, a tool rest 31, a control unit 50, and drive units 110 and 120.

The control unit 50 controls various devices within the machine tool 10. The device configuration of the control unit 50 is arbitrary. The control unit 50 may be configured as a single control unit, or may be configured as multiple control units. As an example, the control unit 50 is a CNC (Computer Numerical Control).

The control unit 50 controls the drive units 120 and 130 according to a pre-designed machining program to machine the workpiece.

The drive unit 120 is a drive mechanism for driving the headstock 21 and the work spindle 22. The device configuration of the drive unit 120 is arbitrary. The drive unit 120 may be configured as a single drive unit, or may be configured as multiple drive units. In the example of FIG. 9, the drive unit 120 is configured as motor drivers 121C, 121Z and motors 122C, 122Z.

The motor driver 121C receives a target value for the rotation speed of the work spindle 22 centered on the Z-axis direction, and outputs a current corresponding to the target value to the motor 122C. In this way, the motor driver 121C controls the rotation speed of the work spindle 22 centered on the Z-axis direction. The motor 122C may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

The motor driver 121Z receives a target value for the position of the headstock 21 in the Z-axis direction, and outputs a current corresponding to the target value to the motor 122Z. In this way, the motor driver 121Z controls the position of the headstock 21 in the Z-axis direction. The motor 122Z may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

The drive unit 130 is a drive mechanism for driving the tool rest 31 and the turret 33. The device configuration of the drive unit 130 is arbitrary. The drive unit 130 may be configured as a single drive unit, or may be configured as multiple drive units. In the example of FIG. 9, the drive unit 130 is configured as motor drivers 131C, 131Y, and 131Z, and motors 132C, 132Y, and 132Z.

The motor driver 131C receives a target value for the rotation angle of the turret 33 about the Z-axis direction, and outputs a current corresponding to the target value to the motor 132C. In this way, the motor driver 131C controls the rotation angle of the turret 33 about the Z-axis direction as the center of rotation. The motor 132C may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

The motor driver 131Y receives a target value for the position of the tool post 31 in the Y-axis direction, and outputs a current corresponding to the target value to the motor 132Y. In this way, the motor driver 131Y controls the position of the tool post 31 in the Y-axis direction. The motor 132Y may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

The motor driver 131Z receives a target value for the position of the tool post 31 in the Z-axis direction, and outputs a current corresponding to the target value to the motor 132Z. In this way, the motor driver 131Z controls the position of the tool post 31 in the Z-axis direction. The motor 132Z may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

F. Modifications
Next, a modified example will be described with reference to FIG.

In the above, an example in which the tool unit 100 is attached to the turret 33 has been described, but the tool unit 100 can be attached to any tool holding part in the machine tool 10. In addition to the turret 33, examples of the tool holding part include a tool spindle.

Below, a machine tool 10A equipped with a tool spindle will be described with reference to FIG. 10. FIG. 10 is a diagram showing an example of the internal structure of the machine tool 10A.

Machine tool 10A is a multi-tasking machine equipped with a turning function that processes a workpiece by bringing a tool into contact with the rotating workpiece, and a milling function that processes a workpiece by bringing a rotating tool into contact with the workpiece.

The machine tool 10A as a multi-tasking machine has, for example, a bed 11, a work spindle 22, a tailstock 25, a tool rest 31, and a tool spindle 95.

The bed 11 is a base member for supporting various devices provided within the machine tool 10A. In the example of FIG. 10, the bed 11 supports the work spindle 22, the tailstock 25, the tool spindle 95, and the tool rest 31. The bed 11 is installed on the floor of a factory or the like. The bed 11 is made of a metal such as cast iron.

The work spindle 22 is configured to be rotatable while holding the workpiece W. More specifically, the work spindle 22 is provided with a chuck mechanism 23. The chuck mechanism 23 is a mechanism for fixing the workpiece W to the work spindle 22. In addition, the work spindle 22 is configured to be rotatable about an axis AX1 that is aligned with the axial direction of the work spindle 22.

The tailstock 25 is configured to be movable in the Z-axis direction by various driving mechanisms such as a motor, and supports the workpiece W from the side opposite the workpiece spindle 22. The tailstock 25 is also configured to be rotatable about the axis AX2. Typically, the axes AX1 and AX2 are coaxial.

The tool rest 31 has a turret 152. The turret 152 is configured to be rotatable around an axis AX3 that is parallel to the Z-axis direction. The turret 152 holds multiple tools spaced apart in the circumferential direction around the axis AX3. The tool rest 31 is also configured to be movable in the X-axis and Y-axis directions by various driving mechanisms such as motors. The tool rest 31 performs turning by bringing a fixed tool held by the turret 152 into contact with the workpiece W that is rotated by the workpiece spindle 22.

The tool spindle 95 is located at a higher position than the work spindle 22 and the tailstock 25. The tool spindle 95 is configured to be rotatable while holding a tool TA. The tool spindle 95 performs milling by bringing the rotating tool TA into contact with a workpiece W fixed to the workpiece spindle 22. Alternatively, the tool spindle 95 performs turning by pressing the tool TA against the rotating workpiece W. The above-mentioned tool unit 100 can also be attached to such a tool spindle 95.

The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

10 Machine tool, 10A Machine tool, 11 Bed, 16 Saddle, 21 Headstock, 22 Work spindle, 23 Chuck mechanism, 25 Tailstock, 31 Tool rest, 32 Tool rest base, 33 Turret, 33A Swivel section, 33B Support section, 40 Tool holder, 50 Control section, 60 Mounting section, 70 Grip section, 75 Linear guide, 77 Pressurized section, 80 Elastic body, 82 Storage section, 90 Roller, 90A Roller, 90B Roller, 95 Tool spindle, 100 Tool unit t, 100X tool unit, 110 drive unit, 120 drive unit, 121C motor driver, 121Z motor driver, 122C motor, 122Z motor, 130 drive unit, 131C motor driver, 131Y motor driver, 131Z motor driver, 132C motor, 132Y motor, 132Z motor, 152 turret, AX0 axis, AX1 axis, AX2 axis, AX3 axis, T tool, TA tool, W workpiece, WI base material, WS surface layer.

Claims (8)

A tool unit having a cutting tool capable of cutting into a rotating workpiece,
A mounting portion configured to be mountable to a tool holding portion in a machine tool;
A gripping portion for gripping the tool;
a linear guide for guiding the gripping portion so that the gripping portion can move relatively to the mounting portion in a direction parallel to a cutting direction of the bit into the workpiece;
a resilient body provided on the tool unit so as to press the gripping portion in the cutting direction. The tool unit further includes first and second rollers provided on the gripping portion so as to sandwich the bit therebetween,
The tool unit according to claim 1 , wherein each of the first and second rollers is provided on the gripping portion such that a rotation axis of the first and second rollers is perpendicular to the cutting direction. The tool unit according to claim 2, wherein at least one of the first and second rollers is configured so that its position in the cutting direction can be adjusted. The first roller is configured to be adjustable in position in the cutting direction,
The tool unit according to claim 2 or 3, wherein the second roller is configured so that its position in the cutting direction cannot be adjusted. The tool unit according to any one of claims 1 to 3, wherein the elastic body is further provided on the tool unit so as to press the mounting portion in a direction opposite to the cutting direction. The tool unit according to any one of claims 1 to 3, wherein the tool holder is a turret. The tool unit according to any one of claims 1 to 3, wherein the tool holder is a tool spindle. A machine tool configured to be able to mount a tool unit according to any one of claims 1 to 3.

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