Working machinery

Abstract

To provide a machine tool that can be configured more compactly, while achieving a diversity of machining.SOLUTION: A machine tool 1 comprises: a first spindle unit 10 that rotates a work-piece W while holding the work-piece; a second spindle unit 20 that rotates the work-piece W while holding the work-piece; a spindle moving mechanism 25 that moves the second spindle 20 in triaxial directions; a stationary cutter holder 30, immovably arranged, which holds a tool 35 that machines the work-piece W held by the second spindle unit 20; a tool spindle unit 50 that holds tools 70 and 80 that machine the work-piece W held by the first spindle unit 10 or by the second spindle unit 20; a tool moving mechanism 42 that moves the tool spindle unit 50 in the triaxial directions; a tool turning mechanism 45 that turns the tools 70 and 80 in a B-axial direction with a rotating shaft as a center; and a tool magazine 60 that stores the plurality of tools 70 and 80 so that the tools 70 and 80 can be exchanged between the tool spindle unit 50 and the magazine.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a machine tool. [Background technology]

[0002] For example, the machine tool described in Patent Document 1 includes a first workpiece holding unit movable in the Z-axis direction, a second workpiece holding unit movable in the X-axis and Z-axis directions, a tool mechanism that enables multiple tools including a rotating tool to move in the X-axis and Y-axis directions, and a B-axis rotating tool unit that enables the rotating tool to rotate around the B-axis. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-181653 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, the machine tool becomes large in size in order to realize a variety of machining operations.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a machine tool that can be configured more compactly while realizing a variety of machining operations. [Means for solving the problem]

[0006] In order to achieve the above object, a machine tool according to the present invention includes a first spindle unit that holds and rotates a workpiece, a second spindle unit that is configured to be able to receive the workpiece from the first spindle unit and that holds and rotates the workpiece, Parallel to the rotation axis of the first spindle unit and the rotation axis of the second spindle unit first direction, Parallel to the depth direction Second direction and Parallel to the vertical directiona second spindle moving mechanism that moves the second spindle unit in a third direction, a fixed tool rest that holds a first tool for machining the workpiece held by the second spindle unit and is provided immovably, a tool spindle unit that holds a second tool for machining the workpiece held by the first spindle unit or the second spindle unit, a tool moving mechanism that moves the tool spindle unit in the first direction, the second direction, and the third direction, a tool rotating mechanism that rotates the second tool together with the tool spindle unit about a rotation axis, and a tool storage unit that stores a plurality of the second tools so that the second tools can be exchanged between the tool spindle unit and the tool spindle unit. The fixed tool rest has a plurality of the first tools in the third direction, and is set at a height that allows the second spindle unit to pass above the fixed tool rest, and the second spindle unit passes above the fixed tool rest when receiving the workpiece from the first spindle unit. do. Effect of the Invention

[0007] According to the present invention, a machine tool can be configured more compactly while still achieving a variety of machining operations. [Brief description of the drawings]

[0008] [Figure 1] 1 is a front view of a machine tool according to a first embodiment of the present invention. [Diagram 2] 1 is a plan view of a machine tool according to a first embodiment of the present invention. [Diagram 3] FIG. 1 is a side view of a machine tool according to a first embodiment of the present invention. [Figure 4] FIG. 6 is a front view of a machine tool according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (First embodiment) Hereinafter, a machine tool according to a first embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, machine tool 1, which is a turning center, comprises a bed S, which is a base for the entire machine tool 1, a first spindle unit 10 having a first spindle 11, a second spindle unit 20 having a second spindle 21, a second spindle moving mechanism 25, a fixed tool rest 30, a tool spindle unit 50, a tool moving mechanism 42, a tool rotating mechanism 45, a support member 13, a tool magazine 60, and a control unit 300. In the following, 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 perpendicular to the Z-axis direction is defined as the X-axis direction, and the depth direction perpendicular to the X-axis and Z-axis directions is defined as the Y-axis direction.

[0010] The first spindle unit 10 holds and rotates a workpiece W. Specifically, the first spindle unit 10 includes a first spindle 11 and a first spindle stock 12 that rotatably supports the first spindle 11. The first spindle 11 holds one end of the workpiece W. A workpiece rotating motor (not shown) that rotates the first spindle 11 is built into the first spindle stock 12. The first spindle unit 10 is configured to be immovable relative to the bed S. 3, the support member 13 is installed on the upper surface of the bed S and supports the first headstock 12 from the side so that the first spindle unit 10 is separated from the bed S in the X-axis direction. The support member 13 is located on the side of the first spindle unit 10 closer to the tool moving mechanism 42 in the Y-axis direction.

[0011] 1 and 2, the second spindle unit 20 is provided at a position facing the first spindle unit 10 in the Z-axis direction. The second spindle unit 20 includes a second spindle 21 that holds the other end of the workpiece W, and a second spindle stock 22 that rotatably supports the second spindle 21. A workpiece rotating motor (not shown) that rotates the second spindle 21 is built into the second spindle stock 22.

[0012] As shown in FIG. 2, the second spindle moving mechanism 25 includes a Y moving mechanism 25Y that moves the second spindle unit 20 in the Y axis direction (Y2 axis direction), and as shown in FIG. 1, an X moving mechanism 25X that moves the second spindle unit 20 in the X axis direction (X2 axis direction), and a Z moving mechanism 25Z that moves the second spindle unit 20 in the Z axis direction (Z2 axis direction).

[0013] As shown in FIG. 2, the tool moving mechanism 42 includes a Y moving mechanism 42Y that moves the tool spindle unit 50 in the Y axis direction (Y1 axis direction), as shown in FIG. 1, an X moving mechanism 42X that moves the tool spindle unit 50 in the X axis direction (X1 axis direction), and a Z moving mechanism 42Z that moves the tool spindle unit 50 in the Z axis direction (Z1 axis direction). 2, slide table 25S, which moves in the Z-axis direction of Z movement mechanism 25Z, and slide table 42S, which moves in the Z-axis direction of Z movement mechanism 42Z, move along a common pair of rails 29 extending in the Z-axis direction on bed S. The pair of rails 29 extend along the Z-axis direction so as to be parallel to first spindle unit 10, second spindle unit 20, and fixed tool rest 30.

[0014] The X-movement mechanism 25X, 42X, the Y-movement mechanism 25Y, 42Y and the Z-movement mechanism 25Z, 42Z each have a motor, a ball screw and a nut, and are configured to convert the rotational force of the motor into linear motion via the ball screw and the nut, thereby moving the corresponding second spindle unit 20 or tool spindle unit 50 linearly.

[0015] 1, the tool turning mechanism 45 turns the tools 70, 80 attached to the tool spindle unit 50 in the B-axis direction by rotating the tool spindle unit 50. The B-axis direction is a rotation direction about a rotation axis along the Y-axis direction.

[0016] The tool magazine 60 stores a plurality of tools 70, 80 of different types, and delivers the tools 70, 80 to and from the tool spindle unit 50. The tool magazine 60 is located above the first headstock 12. The tool magazine 60 is supported by a support member 13. In detail, the tool magazine 60 includes a tool support portion 61 and a drive portion 62 . The tool support part 61 has a substantially annular shape and is supported rotatably about a rotation axis C extending along the Z-axis direction. As shown in FIG. 3, the tool support part 61 has a plurality of tool gripping parts 61a. The plurality of tool gripping parts 61a are located on the outer periphery of the tool support part 61 and are arranged side by side in the rotation direction of the tool support part 61. Each tool gripping part 61a has a U-shaped groove that opens toward the radial outside of the tool support part 61, and holds the tools 70, 80 by fitting the tools 70, 80 into this groove. The tool gripping part 61a holds the tools 70, 80 in an orientation along the Z-axis direction. The driving unit 62 has, for example, a motor, and rotates the tool support unit 61 about a rotation axis C. The driving unit 62 is fixed to the support member 13.

[0017] 1, the tool spindle unit 50 is, for example, a tool spindle, and is configured to be able to mount a fixed tool 70 or a rotating tool 80. The tool spindle unit 50 fixedly supports the fixed tool 70 so that it cannot rotate about its axis, and supports the rotating tool 80 so that it can rotate about its axis. The fixed tool 70 is, for example, a turning tool, and the rotating tool 80 is, for example, a milling tool. The tool spindle unit 50 is located between the first spindle unit 10 and the second spindle unit 20 in the Z-axis direction. The tool spindle unit 50 machines the workpiece W held by the first spindle 11 or the workpiece W held by the second spindle 21 with the attached fixed tool 70 or rotating tool 80 .

[0018] The fixed tool rest 30 is configured so that a plurality of tools 35 for machining the workpiece W held by the second spindle 21 can be attached to it. The plurality of tools 35 can be attached to the fixed tool rest 30 so as to be aligned in each of the X-axis direction and the Y-axis direction. The fixed tool rest 30 is placed on the upper surface of the bed S, and is provided at a height that allows the second spindle unit 20 to pass above. 2, the fixed tool rest 30 is positioned to be aligned with the first spindle unit 10 in the Z-axis direction. The multiple tools 35 include rotating tools such as drills or end mills that rotate to machine the workpiece W, and fixed tools. The tools 35 are attached to the fixed tool rest 30 in a state extending along the Z-axis direction. The fixed tool rest 30 includes a drive unit 31 and a gear train (not shown) that transmits the drive force of the drive unit 31 to the tool 35 (rotating tool) as a rotational force. A work discharge section (not shown), such as a work conveyor, an unloader, or a chute box, is provided near the fixed tool rest 30.

[0019] 1, the control unit 300 controls the first spindle unit 10, the second spindle unit 20, the second spindle movement mechanism 25, the fixed tool rest 30, the tool spindle unit 50, the tool movement mechanism 42, the tool turning mechanism 45, and the tool magazine 60. The control unit 300 includes, for example, a CPU (Central Processing Unit) (not shown), a ROM (Read Only Memory) that stores a program that defines the procedure of processing by the CPU, and the like.

[0020] Next, there will be described the processing executed by the control unit 300. The control unit 300 executes this processing in accordance with an NC (Numerical Control) program created in advance. As shown in FIG. 1, the control unit 300 supplies a workpiece W from the rear of the first spindle unit 10 by a workpiece supply unit (not shown).

[0021] Then, the control unit 300 performs a first machining process on the workpiece W held by the first spindle 11 using the fixed tool 70 or the rotating tool 80 attached to the tool spindle unit 50. In this first machining, for example, when a fixed tool 70 is attached to the tool spindle unit 50, a turning process may be performed using the fixed tool 70 to cut the outer peripheral surface of the workpiece W. In this turning process, the control unit 300 feeds the fixed tool 70 in the Z-axis direction via the tool moving mechanism 42 while rotating the first spindle 11 together with the workpiece W, with the cutting edge of the fixed tool 70 facing the workpiece W from the X-axis direction via the tool turning mechanism 45. In addition, in this first machining, for example, when a rotating tool 80 is attached to the tool spindle unit 50, milling of the workpiece W may be performed using the rotating tool 80. In this milling, the control unit 300 moves the rotating tool 80 via the tool moving mechanism 42 while rotating the rotating tool 80 via the tool spindle unit 50 in a state where the axial rotation of the first spindle 11 and the feed operation in the Z-axis direction are stopped. In addition, milling may be performed on the outer circumferential surface and end surface of the workpiece W in a state where the orientation of the rotating tool 80 is tilted in the B-axis direction with respect to the X1-axis direction via the tool turning mechanism 45. This allows various machining operations to be performed on the workpiece W.

[0022] Next, the control unit 300 moves the second spindle 21 via the second spindle moving mechanism 25 to a position facing the first spindle 11, and transfers the workpiece W from the first spindle 11 to the second spindle 21. At this time, the second spindle 21 is moved in the Z-axis direction toward the first spindle 11 so as to pass above the fixed tool rest 30. Then, the control unit 300 performs a second machining process on the workpiece W held by the second spindle 21 using the tool 35 attached to the fixed tool rest 30 or the tools 70 and 80 attached to the tool spindle unit 50 . In this second machining, for example, similar to the first machining described above, turning or milling may be performed on the workpiece W held by the second spindle 21 using a fixed tool 70 or a rotating tool 80 attached to the tool spindle unit 50. Furthermore, in this second machining, for example, while at least one of the second spindle 21 and the tool 35 is rotating, the cutting edge of the tool 35 held by the fixed tool rest 30 may be brought into contact with the workpiece W held by the second spindle 21, and the tool 35 may be moved relative to the workpiece W via the Z movement mechanism 25Z to perform milling.

[0023] The control unit 300 may perform the first machining on the workpiece W held by the first spindle 11 using the fixed tool 70 or the rotating tool 80 of the tool spindle unit 50, simultaneously with the second machining on the workpiece W held by the second spindle 21 using the tool 35 of the fixed tool rest 30. In this way, by overlapping the time of the first machining and the time of the second machining, it is possible to shorten the cycle time, which is the time required to machine one workpiece.

[0024] Then, when the second machining is completed, the control unit 300 moves the workpiece W after the second machining to a work discharge position Po (see FIG. 2) via the second spindle moving mechanism 25 and discharges it to the outside in cooperation with a work discharge unit (not shown). The work discharge position Po is set to a position near the fixed tool rest 30 where the workpiece W held by the second spindle 21 is retracted in the Z-axis direction from the tool 35 of the fixed tool rest 30. Therefore, after the second machining using the tool 35 of the fixed tool rest 30, the workpiece W can be smoothly discharged to the outside via the work discharge unit. This completes the processing. This processing is repeatedly performed every time a workpiece W is supplied. In addition, in the first processing or the second processing, the control unit 300 may perform only one of the turning processing and the milling processing, or may perform both the turning processing and the milling processing in a predetermined order.

[0025] Next, a description will be given of a tool changing process for changing the type of the tools 70, 80 attached to the tool spindle unit 50. This tool changing process is executed during the above-mentioned machining process, for example, between the turning process and the milling process, or between the first machining process and the second machining process. In the following, an example in which the tool attached to the tool spindle unit 50 is changed from a rotating tool 80 to a fixed tool 70 will be described.

[0026] 1, the control unit 300 rotates the tool support unit 61 via the drive unit 62 to move the tool gripping unit 61a of the tool support unit 61, to which the tools 70, 80 are not attached, to the tool change position Pc. The tool change position Pc is located at the bottom of the tool support unit 61. Next, the control unit 300 rotates the rotating tool 80 attached to the tool spindle unit 50 in the B-axis direction via the tool turning mechanism 45, and faces the tip side of the tool spindle unit 50 toward the tool magazine 60. Then, the control unit 300 moves the rotating tool 80 attached to the tool spindle unit 50 to the radially outer side of the tool support unit 61 relative to the tool changing position Pc, downward in this example, via the tool moving mechanism 42. Then, the control unit 300 moves the rotating tool 80 attached to the tool spindle unit 50 to the radially inner side of the tool support unit 61 relative to the tool changing position Pc, upward in this example, via the tool moving mechanism 42, and causes the tool gripping unit 61a of the tool support unit 61 to grip the tool holder of the rotating tool 80. Then, after releasing the state in which the tool spindle unit 50 clamps the rotating tool 80, the control unit 300 moves the tool spindle unit 50 away from the tool support unit 61 in the Z-axis direction via the tool moving mechanism 42. As a result, the rotating tool 80 moves away from the tool spindle unit 50 and is accommodated in the tool gripping portion 61 a of the tool support portion 61 .

[0027] Next, the control unit 300 rotates the tool support unit 61 via the drive unit 62 to move the fixed tool 70 supported by the tool support unit 61 to the tool changing position Pc. Then, the control unit 300 moves the tool spindle unit 50, via the tool moving mechanism 42, closer to the fixed tool 70 supported by the tool magazine 60 in the Z-axis direction, and attaches the fixed tool 70 to the tool spindle unit 50. At this time, the tool spindle unit 50 clamps the fixed tool 70. Then, the control unit 300 moves the tool spindle unit 50 radially outward from the tool support part 61, downward in this example, via the tool moving mechanism 42, and removes the fixed tool 70 from the tool support part 61. Finally, the fixed tool 70 attached to the tool spindle unit 50 moves in the X-axis and Z-axis directions while rotating in the B-axis direction so as to face the workpiece W. This completes the tool replacement process.

[0028] (effect) According to the first embodiment described above, the following effects are achieved. (1) The machine tool 1 includes a first spindle unit 10 that holds and rotates a workpiece W, a second spindle unit 20 that is configured to be able to receive the workpiece W from the first spindle unit 10 and that holds and rotates the workpiece W, a second spindle movement mechanism 25 that moves the second spindle unit 20 in three axial directions that extend in different directions so as to intersect with each other, the X-axis direction being an example of a first direction, the Y-axis direction being an example of a second direction, and the Z-axis direction being an example of a third direction, and a fixed tool rest that is immovably provided and that holds a tool 35 that is an example of a first tool that machines the workpiece W held by the second spindle unit 20. 30, a tool spindle unit 50 that holds tools 70, 80 which are an example of a second tool for machining a workpiece W held by the first spindle unit 10 or the second spindle unit 20, a tool moving mechanism 42 that moves the tool spindle unit 50 in three axial directions, namely the X-axis direction, the Y-axis direction, and the Z-axis direction, a tool rotating mechanism 45 that rotates the tools 70, 80 together with the tool spindle unit 50 in the B-axis direction around a rotation axis extending along the Y-axis direction, and a tool magazine 60 which is an example of a tool storage section that stores a plurality of tools 70, 80 so that the tools 70, 80 can be exchanged between the tool spindle unit 50 and the tool spindle unit 50. According to this configuration, the tool spindle unit 50 is configured to be rotatable by the tool turning mechanism 45, so that a variety of machining operations can be performed on the workpiece W by changing the orientation of the tools 70, 80 attached to the tool spindle unit 50 relative to the workpiece W. Also, a variety of machining operations can be performed with a single machine tool 1 by exchanging the tools 70, 80 attached to the tool spindle unit 50 between the tool magazine 60. This eliminates the need to divide the process among a plurality of machine tools, and the machining line can be shortened. Furthermore, since the fixed tool rest 30 is immovably provided, there is no need for space or a mechanism for moving the fixed tool rest 30, allowing for a compact configuration of the machine tool 1. Also, since there is no need for a mechanism for moving the fixed tool rest 30, costs can be reduced. Furthermore, even if the fixed tool rest 30 is immovable, the second spindle unit 20 is movable in the X-axis direction (up and down direction). This allows a plurality of tools 35 aligned in the X-axis direction to be attached to the fixed tool rest 30. Similarly, if the second spindle unit 20 is movable in the Y-axis direction (depth direction), then a plurality of tools 35 aligned in the Y-axis direction can be attached to the fixed tool rest 30. This allows the number of tools 35 to be increased while keeping the fixed tool rest 30 compact. Furthermore, the tool spindle unit 50 can utilize the tools 70, 80 to machine the workpiece W held by the first spindle unit 10, and can also machine the workpiece W held by the second spindle unit 20. Furthermore, by changing the type of tools 70, 80 held by the tool spindle unit 50, both milling and turning are possible. Furthermore, while the workpiece W held by the second spindle unit 20 is being machined by the tool 35 of the fixed tool rest 30, another workpiece W held by the first spindle unit 10 can be machined by the tools 70, 80 of the tool spindle unit 50. This makes it possible to shorten the cycle time required to machine the workpiece W. Furthermore, the workpiece W is supplied to the first spindle unit 10, a first machining is performed on the workpiece W held by the first spindle unit 10 by the tools 70, 80, the workpiece W after the first machining is transferred from the first spindle unit 10 to the second spindle unit 20, a second machining is performed on the workpiece W held by the second spindle unit 20 by the tools 35, 70, 80, and the workpiece W is then discharged to the outside using a workpiece discharge section (not shown) such as a workpiece conveyor or an unloader. In this way, the machine tool 1 can automatically complete the machining from the supply to the discharge of the workpiece W without human intervention. Furthermore, since there is no human intervention, installation defects of the workpiece W can be suppressed. Furthermore, by positioning the workpiece discharge position Po in the vicinity of the fixed tool rest 30, the workpiece W can be quickly discharged to the outside after machining of the workpiece W by the second spindle unit 20 using the tool 35 is completed.

[0029] (2) The first spindle unit 10 is immovably installed. According to this configuration, since the first spindle unit 10 is immovably provided, there is no need for space and a mechanism for moving the first spindle unit 10, and it is possible to configure a compact machine tool 1. In addition, since there is no need for a mechanism for moving the first spindle unit 10, it is possible to reduce costs.

[0030] (3) The machine tool 1 is dedicated to machining a workpiece W formed from a bar stock. The first spindle unit 10 holds the workpiece W without a guide bush. According to this configuration, since there is no guide bush and the workpiece W is supported only by the first spindle unit 10 during machining, the machine tool 1 can be configured compactly. Moreover, the machine tool 1 is configured to be specialized for machining a small-diameter, short workpiece W. This allows the machine tool 1 to be configured compactly. Specifically, if the diameter of the workpiece W is small, the structure in which the first spindle 11 and the second spindle 21 hold the workpiece W can be made compact. Therefore, it is preferable that the workpiece W is formed, for example, of a slender bar material (the diameter is smaller than the length) and has, for example, a cylindrical shape. For example, it is preferable that the diameter of the workpiece W is about 40 mm or less. Furthermore, by shortening the length of the workpiece W, the movement distance in the Z-axis direction of the second spindle unit 20, the tool spindle unit 50, etc. can be reduced, and the workpiece W held by the first spindle 11 does not need to be supported by a guide bush, making it possible to eliminate the need for a guide bush. Therefore, it is preferable that the workpiece W is a short workpiece whose length is short enough that it can be held by the first spindle 11 without a guide bush. Furthermore, if the workpiece W has a small diameter and a short length, the weight of the workpiece W is reduced. This reduces the motor torque required to rotate the workpiece W, and the workpiece rotating motors (not shown) of the first spindle unit 10 and the second spindle unit 20 can be made smaller.

[0031] (4) The tool magazine 60 is provided above the first spindle unit 10. If the tool magazine 60 is provided in a location other than above the first spindle unit 10, a separate space is required for the tool magazine 60, but by providing the tool magazine 60 above the first spindle unit 10, this space is not required. Therefore, the machine tool 1 can be configured compactly. In addition, the machining position of the workpiece W held by the first spindle unit 10 and the tool exchange position Pc of the tool magazine 60 can be set close to each other. Therefore, the tool spindle unit 50 can quickly shift from tool exchange to machining.

[0032] (5) The machine tool 1 is equipped with the control unit 300 which moves the tool spindle unit 50 to a position opposite the tool magazine 60 via the tool moving mechanism 42 and exchanges the tools 70, 80 directly between the tool spindle unit 50 and the tool magazine 60. This configuration eliminates the need for a tool changer (ATC: Automatic Tool Changer) that exchanges tools 70, 80 between tool spindle unit 50 and tool magazine 60. This allows machine tool 1 to be configured compactly.

[0033] Second embodiment A machine tool according to a second embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the machine tool is suitable for machining a long workpiece, and differs from the first embodiment in that the first spindle unit is configured to be movable and a guide bush is provided. The following description will focus on the differences from the first embodiment.

[0034] As shown in FIG. 4, the machine tool 1A includes a first spindle moving mechanism 15 and a guide bush 18 in addition to the configuration of the first embodiment described above. The first spindle moving mechanism 15 moves the first spindle unit 10 in the Z-axis direction under the control of the control unit 300. The first spindle moving mechanism 15 has a motor, a ball screw, and a nut, similar to the Z movement mechanisms 25Z and 42Z. The first spindle moving mechanism 15 feeds the workpiece W in the Z-axis direction, for example, during the first machining process. The guide bush 18 supports the tip side of the workpiece W held by the first spindle 11. The guide bush 18 is located between the first spindle unit 10 and the machining point of the workpiece W, and is provided so as to be immovable relative to the bed S. More specifically, the guide bush 18 is fixed to a support table 19. The support table 19 is provided on the upper surface of the bed S, and supports the first spindle moving mechanism 15. The guide bush 18 supports the workpiece W, thereby suppressing bending and vibration of the workpiece W during the first machining.

[0035] (effect) According to the second embodiment described above, the following effects are achieved. The machine tool 1A includes a first spindle moving mechanism 15 that moves the first spindle unit 10 in the Z-axis direction along the rotation axis of the workpiece W, and a guide bush 18 that supports the workpiece W held by the first spindle unit 10. According to this configuration, even if the workpiece W is a long workpiece having a length longer than that of the first embodiment, the workpiece W can be stably supported by the guide bush 18 during the first machining process, and the workpiece W can be fed in the Z-axis direction by the first spindle moving mechanism 15. Therefore, even if the workpiece W is a long workpiece, various machining processes can be performed on the workpiece W, and the workpiece W can be machined into a complex shape.

[0036] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) can be made as appropriate within the scope of the present disclosure. An example of a modification will be described below.

[0037] (Modification) In each of the above-described embodiments, the tool magazine 60 is provided above the first spindle unit 10, but may be provided at another position. For example, the tool magazine 60 may be provided at a position shifted in the Z-axis direction with respect to the first spindle unit 10, or may be provided below the first spindle unit 10. In each of the above embodiments, the workpiece W is formed from a bar material, but is not limited to this and may be in another shape, such as a disk shape.

[0038] In each of the above embodiments, the tool spindle unit 50 directly exchanges the tools 70, 80 with the tool magazine 60, but this is not limited to the above, and the ATC may exchange the tools 70, 80 between the tool spindle unit 50 and the tool magazine 60. [Explanation of symbols]

[0039] 1...machine tool, 10...first spindle unit, 11...first spindle, 12...first spindle stock, 13...support member, 15...first spindle movement mechanism, 18...guide bush, 19...support base, 20...second spindle unit, 21...second spindle, 22...second spindle stock, 25...second spindle movement mechanism, 25S, 42S...slide base, 25X, 42X...X movement mechanism, 25Y, 42Y...Y movement mechanism, 25Z, 42Z...Z Movement mechanism, 29... rail, 30... fixed tool rest, 31, 62... drive unit, 35, 70, 80... tool, 42... tool movement mechanism, 45... tool rotation mechanism, 50... tool spindle unit, 60... tool magazine, 61... tool support unit, 61a... tool gripper unit, 70... fixed tool, 80... rotating tool, 300... control unit, C... rotating axis, S... bed, W... workpiece, Pc... tool change position, Po... workpiece discharge position

Claims

1. A first spindle unit that holds and rotates a workpiece; a second spindle unit configured to be able to receive the workpiece from the first spindle unit and to rotate the workpiece while holding it; a second spindle moving mechanism that moves the second spindle unit in a first direction parallel to a rotation axis of the first spindle unit and a rotation axis of the second spindle unit, a second direction parallel to a depth direction, and a third direction parallel to a vertical direction; a fixed tool rest that holds a first tool for machining the workpiece held by the second spindle unit and is immovably provided; a tool spindle unit that holds a second tool for machining the workpiece held by the first spindle unit or the second spindle unit; a tool moving mechanism that moves the tool spindle unit in the first direction, the second direction, and the third direction; a tool turning mechanism that turns the second tool together with the tool spindle unit around a rotation axis; a tool storage unit that stores a plurality of the second tools so that the second tools can be exchanged between the tool spindle unit and the tool storage unit, the fixed tool rest has a plurality of the first tools in the third direction, and is set at a height that allows the second spindle unit to pass above the fixed tool rest, the second spindle unit passes above the fixed tool rest when receiving the workpiece from the first spindle unit; Machine tools.

2. The rotation axis of the first spindle unit is located above the fixed tool rest. The machine tool according to claim 1.

3. A slide table of the second spindle moving mechanism on which the second spindle unit is provided and a slide table of the tool moving mechanism on which the tool spindle unit is provided move on a common pair of rails extending in the first direction, The pair of rails is provided rearward of the first spindle unit in the second direction.

3. A machine tool according to claim 1 or 2.

4. Further comprising a support member for supporting the first spindle unit and the tool storage section, The tool storage section is supported by the support member above the first spindle unit. A machine tool according to any one of claims 1 to 3.

5. The support member is provided on a side of the first spindle unit closer to the tool moving mechanism in the second direction. The machine tool according to claim 4.

6. a control unit that moves the tool spindle unit to a position facing the tool storage unit via the tool moving mechanism to directly exchange the second tool between the tool spindle unit and the tool storage unit, The second tool is replaced at the bottom of the tool storage section. A machine tool according to any one of claims 1 to 5.

Images