Machine tool

Abstract

To provide a rotary table unit which enables improvement of processing accuracy of a workpiece, and to provide a machine tool including the rotary table unit.SOLUTION: A rotary table unit 100 includes: a rotary table 21 which may rotate around a predetermined axis 101; a tail stock 41 which is disposed facing the rotary table 21 in an axial direction of the predetermined axis 101; and a holding member 31 which has a first support part 36 supporting the rotary table 21, a second support part 32 supporting the tail stock 41, and a connection part 38 connecting the first support part 36 with the second support part 32, holds the rotary table 21 and the tail stock 41, and is fixed in a circumferential direction of the predetermined axis 101 during rotation of the rotary table 21.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotary table unit and a machine tool. [Background technology]

[0002] For example, JP 2017-13140 A (Patent Document 1) discloses a vertical lathe that includes a movable tool rest and a rotating table that can rotate around a central axis of rotation extending in the vertical direction, and that uses a turning tool held in the tool rest to turn a workpiece that is placed and fixed on the rotating table. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-13140 A Summary of the Invention [Problem to be solved by the invention]

[0004] As disclosed in the above-mentioned Patent Document 1, it is known that turning, in which a workpiece is machined with a fixed tool while rotating the workpiece, is performed by a machine tool equipped with a rotary table, such as a five-axis machining center. When turning a long workpiece with such a machine tool, the amount of runout of the workpiece with respect to the center of rotation of the rotary table increases, which may result in a decrease in the machining accuracy of the workpiece.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a rotary table unit capable of improving the machining accuracy of a workpiece, and a machine tool equipped with such a rotary table unit. [Means for solving the problem]

[0006] The rotary table unit according to the present invention comprises a rotary table rotatable around a specific axis, a tailstock arranged opposite the rotary table in the axial direction of the specific axis, a first support portion supporting the rotary table, a second support portion supporting the tailstock, and a connecting portion connecting the first support portion and the second support portion, and a holding member which holds the rotary table and the tailstock and is fixed in the circumferential direction of the specific axis when the rotary table rotates.

[0007] A machine tool according to the present invention includes the above-mentioned rotary table unit, and a transport device for transporting the rotary table unit between the inside and outside of a machining area. Effect of the Invention

[0008] According to the present invention, it is possible to provide a rotary table unit capable of improving the accuracy of workpiece machining, and a machine tool equipped with such a rotary table unit. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a rotary table unit according to an embodiment of the present invention; [Diagram 2] 2 is a top view showing an internal structure of a machine tool equipped with the rotary table unit in FIG. 1. [Diagram 3] 3 is a cross-sectional view showing the machine tool as seen in the direction of the arrows on line III-III in FIG. 2. [Figure 4] 4 is a cross-sectional view showing the machine tool in FIG. 3 (when a rotary table unit is being transported). [Diagram 5] FIG. 2 is a diagram showing a schematic diagram of the internal structure of the tailstock (when a workpiece is clamped). [Figure 6] FIG. 2 is a diagram showing a schematic internal structure of the tailstock (when the workpiece is unclamped). [Figure 7] FIG. 4 is a cross-sectional view of a machine tool for explaining a rotation prevention mechanism of a holding member. [Figure 8] FIG. 11 is another cross-sectional view of the machine tool for explaining the anti-rotation mechanism of the holding member. [Figure 9] 8 is a cross-sectional view showing a modified example of the anti-rotation mechanism in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the accompanying drawings, in which the same or corresponding components are designated by the same reference numerals.

[0011] Fig. 1 is a perspective view showing a rotary table unit in an embodiment of the present invention, Fig. 2 is a top view showing an internal structure of a machine tool provided with the rotary table unit in Fig. 1.

[0012] 1 and 2, machine tool 10 is a machining center that machines a workpiece by bringing a rotating tool into contact with a stationary workpiece. Machine tool 10 has a rotary table 21. Machine tool 10 is further provided with a turning function that machines a workpiece by bringing a tool into contact with the workpiece while rotating the workpiece with rotary table 21.

[0013] The machine tool 10 is an NC (Numerically Controlled) machine tool in which various operations for machining a workpiece are automated by computer numerical control.

[0014] In this specification, an axis that is parallel to the direction of the rotation axis of the work and extends vertically is referred to as the "Z axis," an axis that is parallel to the direction in which the tool approaches the rotating work and extends horizontally is referred to as the "X axis," and an axis that is perpendicular to the X axis and extends horizontally is referred to as the "Y axis." Note that for the convenience of explaining the structures of machine tool 10 and rotary table unit 100, the X axis, Y axis, and Z axis are set as above, but these do not necessarily coincide with the X axis, Y axis, and Z axis defined in a machining center.

[0015] First, there will be described the structure of the machine tool 10. The machine tool 10 has a cover body 18, a tool spindle 12, a rotary table unit 100, and a base member 51.

[0016] The cover body 18 defines the machining area 16 and also defines the external appearance of the machine tool 10. The machining area 16 is a space where machining of a workpiece is performed, and is sealed so that foreign matter such as cutting chips or cutting oil resulting from workpiece machining does not leak out of the machining area 16.

[0017] The tool spindle 12 is provided in the machining area 16. The tool spindle 12 is rotatable about a rotation center axis 103 parallel to the X-axis by being driven by a motor. A clamping mechanism for detachably holding a tool is built into the tool spindle 12. The tool spindle 12 selectively holds either a rotating tool such as a drill, a reamer, or a milling cutter, or a fixed tool T for turning. In FIG. 2, the tool spindle 12 holds the fixed tool T.

[0018] The rotary table unit 100 is a device for fixing the workpiece W. The rotary table unit 100 has a rotary table 21. The rotary table 21 is rotatable about a predetermined axis 101 parallel to the Z axis (vertical direction).

[0019] The rotary table 21 has a face plate portion 26. The face plate portion 26 is a metal pallet. The face plate portion 26 is made of a disk whose thickness direction is the axial direction of a predetermined axis 101 and whose center is the predetermined axis 101. A workpiece W is placed on the face plate portion 26. The workpiece W is made of an elongated body whose longitudinal direction is the axial direction of the predetermined axis 101. The workpiece W has a cylindrical shape whose center is the predetermined axis 101. The overall length of the workpiece W may be larger than the diameter of the workpiece W, may be two or more times the diameter of the workpiece W, or may be four or more times the diameter of the workpiece W. As the rotary table 21 rotates, the workpiece W rotates about the predetermined axis 101.

[0020] The base member 51 is provided within the processing area 16. The rotary table unit 100 is placed on the base member 51. The base member 51 is fixed within the processing area 16.

[0021] The above-described axial configuration of the machine tool 10 is merely an example and is not particularly limited. For example, the axial configuration may be such that the tool spindle 12 is movable in the Y-axis direction and the Z-axis direction, and the base member 51 is movable in the X-axis direction. The base member 51 may be configured to be rotatable (tiltable) about a central axis of rotation parallel to the Y-axis so that the inclination of a predetermined axis 101 corresponding to the central axis of rotation of the rotary table 21 changes within the X-axis-Z-axis plane.

[0022] The machine tool 10 further includes a transport device 61 and a swivel cover 66. The transport device 61 transports the rotary table unit 100 between the inside and the outside of the processing area 16. The external space outside the processing area 16 corresponds to a setup station 17.

[0023] The setup station 17 is a space for mounting a workpiece to be processed in the processing area 16 onto the turntable unit 100 and removing a workpiece after processing in the processing area 16 from the turntable unit 100. In the setup station 17, a setup side mounting table 56 for mounting the turntable unit 100 thereon is provided.

[0024] 2 shows a boundary surface 110 that is parallel to the Y-Z plane and forms a boundary between the processing area 16 and the setup station 17. The swivel cover 66 is provided so as to overlap the boundary surface 110. The processing area 16 and the setup station 17 are separated from each other by the swivel cover 66.

[0025] The transport device 61 has a first arm member 62A, a second arm member 62B, and a connecting portion 63.

[0026] The first arm member 62A is provided with a gap between them in the Y-axis direction and consists of a pair of arms extending in one direction along the X-axis direction from the connecting portion 63. The second arm member 62B is provided with a gap between them in the Y-axis direction and consists of a pair of arms extending in the opposite direction along the X-axis direction from the connecting portion 63.

[0027] The connecting portion 63 connects the first arm member 62A and the second arm member 62B to each other. An end of the first arm member 62A in the X-axis direction is connected to the connecting portion 63. An end of the second arm member 62B in the X-axis direction is connected to the connecting portion 63. The connecting portion 63 is provided directly below the swivel cover 66. The swivel cover 66 is connected to the connecting portion 63.

[0028] The first arm member 62A and the second arm member 62B are provided so as to be slidable in the Z-axis direction (up and down direction) and rotatable 180° about a pivot axis 102 by an arm drive mechanism (not shown) connected to the connecting portion 63. The pivot axis 102 overlaps with the boundary surface 110 and extends in the Z-axis direction.

[0029] The first arm member 62A and the second arm member 62B rotate 180° about the central axis 102 to move in an inverted manner between the processing area 16 and the setup station 17. The rotating cover 66 rotates 180° about the central axis 102 together with the first arm member 62A and the second arm member 62B.

[0030] 2, a first arm member 62A and a second arm member 62B are disposed in the processing area 16 and the setup station 17, respectively. The first arm member 62A slides upward to lift the first turntable unit 100A from the base member 51. The second arm member 62B slides upward to lift the second turntable unit 100B from the setup-side mounting table 56.

[0031] The first arm member 62A rotates 180° about the pivot central axis 102 to transport the first turntable unit 100A from the processing area 16 to the setup station 17. The second arm member 62B rotates 180° about the pivot central axis 102 to transport the second turntable unit 100B from the setup station 17 to the processing area 16. The first arm member 62A slides downward to place the first turntable unit 100A on the setup-side placement table 56. The second arm member 62B slides downward to place the second turntable unit 100B on the base member 51.

[0032] Next, a detailed description will be given of the structure of the rotary table unit 100. Fig. 3 is a cross-sectional view showing the machine tool as seen in the direction of the arrows on the line III-III in Fig. 2. Fig. 4 is a cross-sectional view showing the machine tool in Fig. 3 (when the rotary table unit is being transported).

[0033] 1 to 4, the rotary table 21 further includes a bearing housing 24, a shaft 22, and a bearing 29. The shaft 22 extends on a predetermined axis 101. The face plate portion 26 is connected to one end of the shaft 22 in the axial direction of the predetermined axis 101. The face plate portion 26 extends from the end of the shaft 22 radially outward of the predetermined axis 101.

[0034] The bearing housing 24 is provided on the outer periphery of the shaft 22. The bearing 29 is interposed between the bearing housing 24 and the shaft 22 in the radial direction of the predetermined axis 101. The bearing 29 allows the shaft 22 to rotate relative to the bearing housing 24 on the fixed side.

[0035] The shaft 22 has a clutch shaft 25. The clutch shaft 25 extends on the axis of the specified axis 101. The clutch shaft 25 protrudes from the other end of the shaft 22 in the axial direction of the specified axis 101.

[0036] The machine tool 10 further has a motor 52. The motor 52 is provided inside the base member 51. As shown in Fig. 3, when the rotary table unit 100 is placed on the base member 51, the clutch shaft 25 is connected to an output shaft 53 of the motor 52. The rotational motion from the motor 52 is transmitted to the shaft 22, causing the face plate portion 26 to rotate about the predetermined axis 101.

[0037] The rotary table unit 100 further has a tailstock 41. The tailstock 41 is disposed opposite the rotary table 21 (face plate portion 26) in the axial direction of the specified axis 101. The workpiece W is disposed between the tailstock 41 and the face plate portion 26 in the axial direction of the specified axis 101.

[0038] The tailstock 41 has an exterior body 42 and a center 46. The exterior body 42 has a cylindrical shape centered on a predetermined axis 101 as a whole, and forms the appearance of the tailstock 41. The diameter of the exterior body 42 centered on the predetermined axis 101 is smaller than the diameter of the face plate portion 26 centered on the predetermined axis 101.

[0039] The center 46 extends on the axis of the specified shaft 101. The center 46 has a pin shape that protrudes toward the rotary table 21. The center 46 is provided so as to be movable forward and backward relative to the workpiece W placed on the rotary table 21 by sliding in the axial direction of the specified shaft 101. The tailstock 41 is of a quill type in which the center 46 is attached to a quill (not shown). However, the tailstock 41 is not limited to this, and may be of a rotating center type in which the center 46 is supported by a bearing.

[0040] Fig. 5 is a diagram showing a typical internal structure of the tailstock (when a workpiece is clamped), and Fig. 6 is a diagram showing a typical internal structure of the tailstock (when a workpiece is unclamped).

[0041] 5 and 6, the tailstock 41 further includes a slide mechanism 70 and a lock mechanism 71. The slide mechanism 70 and the lock mechanism 71 are arranged in a locking manner.

[0042] The slide mechanism 70 slides the center 46 in the axial direction of the specified axis 101 when hydraulic pressure is supplied to it. The slide mechanism 70 is made of a hydraulic cylinder, and is arranged alongside a quill (not shown) to which the center 46 is attached in the axial direction of the specified axis 101. The slide mechanism 70 moves the center 46 to a position where it abuts against the workpiece W placed on the rotary table 21 when hydraulic oil for clamping is supplied to it. The slide mechanism 70 moves the center 46 to a position away from the workpiece W placed on the rotary table 21 when hydraulic oil for unclamping is supplied to it.

[0043] The lock mechanism 71 is configured to fix the center 46 in a position where it abuts against the workpiece W placed on the rotary table 21 even when hydraulic pressure is not supplied to the slide mechanism 70.

[0044] More specifically, the lock mechanism 71 has a piston cylinder 74, a housing 72, a wedge member 73, and a spring member 75. A piston (not shown) that can be stroked in the axial direction of a specific axis 101 by hydraulic pressure is installed in the piston cylinder 74. The wedge member 73 is connected to the piston of the piston cylinder 74. The wedge member 73 is disposed inside the housing 72. The wedge member 73 has a tapered surface 73a. The housing 72 has a tapered surface 72a. The tapered surface 72a faces the tapered surface 73a. The tapered surfaces of the tapered surface 72a and the tapered surface 73a are inclined with respect to the specific axis 101. The spring member 75 applies an elastic force to the wedge member 73 in a direction in which the tapered surface 73a approaches the tapered surface 72a in the axial direction of the specific axis 101.

[0045] 5, hydraulic oil for clamping is supplied to the slide mechanism 70, whereby the center 46 comes into contact with the workpiece W placed on the turntable 21. This results in a clamped state of the workpiece W in which the workpiece W is sandwiched between the center 46 and the turntable 21 (face plate portion 26).

[0046] At this time, in the lock mechanism 71, the wedge member 73 is pulled into the inside of the housing 72 by the elastic force of the spring member 75. A wedge force is generated by pressing the tapered surface 73a against the tapered surface 72a. The wedge force acts on the slide mechanism 70 (or the quill to which the center 46 is attached) so as to fix the position of the center 46 in the axial direction of the predetermined axis 101. As a result, even if the supply of hydraulic pressure to the slide mechanism 70 is stopped, the center 46 is fixed at a position where it abuts against the workpiece W, and the clamped state of the workpiece W is maintained.

[0047] 6, hydraulic oil for unclamping is supplied to the slide mechanism 70, and hydraulic oil is also supplied to the piston cylinder 74 in the lock mechanism 71, so that the center 46 moves away from the workpiece W placed on the turntable 21. This results in an unclamped state of the workpiece W, in which the workpiece W is released from between the center 46 and the turntable 21 (face plate portion 26).

[0048] At this time, in the lock mechanism 71, the piston of the piston cylinder 74 strokes in the axial direction of the predetermined axis 101 so as to push the wedge member 73 outward from the housing 72. The tapered surface 73a moves away from the tapered surface 72a, whereby the generation of the wedge force stops.

[0049] 1 to 4, the turntable unit 100 further has a holding member 31. The holding member 31 holds the turntable 21 and the tailstock 41. The holding member 31 holds the turntable 21 and the tailstock 41 as a unit. The holding member 31 is fixed (stationary) in the circumferential direction of the predetermined axis 101 when the turntable 21 rotates. The holding member 31 holds the turntable 21 and the tailstock 41 without rotating together with the turntable 21 around the predetermined axis 101. When the turntable 21 rotates, the entire turntable unit 100 does not rotate around the predetermined axis 101.

[0050] The holding member 31 has a first support portion 36, a second support portion 32, and a connection portion 38. The first support portion 36 supports the rotary table 21. The second support portion 32 supports a tailstock 41. The connection portion 38 connects the first support portion 36 and the second support portion 32.

[0051] The holding member 31 is made of metal. The first support portion 36, the second support portion 32 and the connection portion 38 are integrally formed by casting or the like.

[0052] The first support portion 36 is provided at the bottom of the holding member 31. The first support portion 36 is arranged parallel to the X-Y plane and has a floor shape with the thickness direction being in the Z-axis direction. The first support portion 36 is provided so as to cover the bearing housing 24 from the radial outside of the predetermined axis 101.

[0053] The second support portion 32 is provided at a position spaced above the first support portion 36. The second support portion 32 is provided so as to support the exterior body 42 from one side in the X-axis direction. The second support portion 32 is molded integrally with the exterior body 42 by casting or the like.

[0054] The center 46 is disposed between the first support portion 36 and the second support portion 32 in the axial direction of the specified axis 101. The face plate portion 26 is disposed between the first support portion 36 and the second support portion 32 in the axial direction of the specified axis 101.

[0055] The connection part 38 extends in a columnar shape in the Z-axis direction (up and down direction). The lower end of the connection part 38 is connected to the first support part 36. The upper end of the connection part 38 is connected to the second support part 32. In top view, the connection part 38 is provided so as to surround the turntable 21 (face plate part 26) from one side in the X-axis direction. In top view, the connection part 38 extends while curving along the outer periphery of the turntable 21.

[0056] The connection portion 38 is provided with a plurality of openings 33. The openings 33 are through holes that penetrate the connection portion 38 in the radial direction of the specified axis 101. The openings 33 are provided at positions facing the rotary table 21 (face plate portion 26) in the radial direction of the specified axis 101. The plurality of openings 33 are provided at intervals from one another in the circumferential direction of the specified axis 101. When the workpiece W is machined, chips and coolant present on the face plate portion 26 are guided through the openings 33 to a predetermined discharge path provided in the bed (not shown).

[0057] In this embodiment, the workpiece W is turned by rotating the workpiece W around the predetermined axis 101 using the rotary table 21 while the fixed tool T held by the tool spindle 12 is brought into contact with the workpiece W. In this case, the amount of runout of the workpiece W around the predetermined axis 101 can be kept small by supporting the workpiece W placed on the rotary table 21 in the axial direction of the predetermined axis 101 using the tailstock 41 (center 46). This allows the machining accuracy of the workpiece W to be improved.

[0058] In addition, the tailstock 41 is transported integrally with the rotary table 21 between the inside and outside of the processing area 16. This allows the tailstock 41 to be used as a clamper for fixing the workpiece W to the rotary table 21.

[0059] 3 and 4, machine tool 10 further has a coupler 91. When rotary table unit 100 is placed on base member 51, coupler 91 connects fluid passages 120 (120p, 120q) between base member 51 and rotary table unit 100. In FIGS. 3 and 4, it is assumed that hydraulic oil for clamping supplied to tailstock 41 flows through fluid passage 120.

[0060] The base member 51 has a seating surface 51j. The turntable unit 100 is seated on the seating surface 51j. The base member 51 is provided with a fluid passage 120p. The turntable unit 100 (holding member 31) has an opposing surface 31j. The opposing surface 31j faces the seating surface 51j in the Z-axis direction. The turntable unit 100 (holding member 31) is provided with a fluid passage 120q.

[0061] The coupler 91 has a first coupler piece 92 and a second coupler piece 93. The first coupler piece 92 is provided on the base member 51. The first coupler piece 92 is provided on the seating surface 51j. The fluid passage 120p is connected to the first coupler piece 92. The second coupler piece 93 is provided on the rotating table unit 100 (holding member 31). The second coupler piece 93 is provided on the opposing surface 31j. The second coupler piece 93 is provided opposite the first coupler piece 92 in the Z-axis direction. The fluid passage 120q is connected to the second coupler piece 93.

[0062] The first coupler piece 92 and the second coupler piece 93 are connected to each other when the turntable unit 100 is placed on the base member 51. The fluid passages 120p and 120q communicate with each other through the coupler 91, thereby connecting the fluid passage 120 between the base member 51 and the turntable unit 100.

[0063] The base member 51 and the rotary table unit 100 are provided with a plurality of couplers for supplying various fluids such as hydraulic oil and lubricating oil for unclamping. Also, in order to enable clamping and unclamping of the workpiece W in the setup station 17, the setup side mounting table 56 is provided with a coupler for supplying hydraulic oil to the tailstock 41.

[0064] According to this configuration, various fluids used in the rotary table unit 100 can be supplied to the rotary table unit 100 from the main body side of the machine tool 10 through the coupler 91.

[0065] On the other hand, when the transport device 61 transports the turntable unit 100, the coupler is disconnected, and the supply of hydraulic pressure to the tailstock 41 (slide mechanism 70) is stopped. Even in this case, the lock mechanism 71 fixes the center 46 to a position where it abuts against the workpiece W, so the tailstock 41 can maintain the state in which it presses and supports the workpiece W in the axial direction of the predetermined axis 101.

[0066] 7 and 8 are cross-sectional views of the machine tool for explaining the anti-rotation mechanism of the holding member. With reference to Figs. 7 and 8, the machine tool 10 further has an anti-rotation mechanism 80.

[0067] When the turntable unit 100 is placed on the base member 51 , the anti-rotation mechanism 80 engages between the base member 51 and the turntable unit 100 to regulate the rotation of the holding member 31 relative to the base member 51 .

[0068] The anti-rotation mechanism 80 is composed of a pin member 81 and a pin insertion hole 82. The pin member 81 is provided on the base member 51. The pin member 81 protrudes from the seating surface 51j. The pin insertion hole 82 is provided in the holding member 31 (first support portion 36). The pin insertion hole 82 is a bottomed hole that opens to the opposing surface 31j. The pin insertion hole 82 is provided opposite the pin member 81 in the Z-axis direction (up-down direction).

[0069] When the turntable unit 100 is placed on the base member 51, the pin member 81 is inserted into the pin insertion hole 82, whereby the anti-rotation mechanism 80 engages between the base member 51 and the turntable unit 100. This makes it possible to prevent the holding member 31 from rotating together with the turntable 21 when the turntable 21 (face plate portion 26) rotates.

[0070] Machine tool 10 may have a plurality of anti-rotation mechanisms 80 arranged apart from each other in the planar direction of the XY plane.

[0071] Fig. 9 is a cross-sectional view showing a modified example of the anti-rotation mechanism in Fig. 7. Referring to Fig. 9, in this modified example, a connecting passage 86 is provided in a pin member 81. The connecting passage 86 is formed of a through hole that penetrates the pin member 81 in the Z-axis direction (up and down direction) and opens into the space within the pin insertion hole 82. A fluid passage 120p communicates with the connecting passage 86. A fluid passage 120q communicates with the space within the pin insertion hole 82.

[0072] According to this configuration, when the anti-rotation mechanism 80 is engaged between the base member 51 and the turntable unit 100, the hydraulic oil from the fluid passage 120p is guided to the fluid passage 120q through the connection passage 86. As a result, the anti-rotation mechanism 80 functions as a coupler for allowing the fluid to flow in addition to the function of preventing the rotation of the holding member 31, so that the number of parts can be reduced.

[0073] To summarize the structure of the rotary table unit 100 in the embodiment of the present invention described above, the rotary table unit 100 in this embodiment comprises a rotary table 21 rotatable around a specific axis 101, a tailstock 41 arranged opposite the rotary table 21 in the axial direction of the specific axis 101, a first support portion 36 supporting the rotary table 21, a second support portion 32 supporting the tailstock 41, and a connection portion 38 connecting the first support portion 36 and the second support portion 32, and a holding member 31 which holds the rotary table 21 and the tailstock 41 and is fixed in the circumferential direction of the specific axis 101 when the rotary table 21 rotates.

[0074] The rotary table unit 100 also includes a rotary table 21 rotatable around a specific axis 101, a tailstock 41 arranged opposite the rotary table 21 in the axial direction of the specific axis 101, a first support portion 36 supporting the rotary table 21, a second support portion 32 supporting the tailstock 41, and a connection portion 38 connecting the first support portion 36 and the second support portion 32, and a holding member 31 holding the rotary table 21 and the tailstock 41.

[0075] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0076] 10 machine tool, 12 tool spindle, 16 machining area, 17 setup station, 18 cover body, 21 rotary table, 22 shaft, 24 bearing housing, 25 clutch shaft, 26 face plate portion, 29 bearing, 31 holding member, 31j opposing surface, 32 second support portion, 33 opening, 36 first support portion, 38 connection portion, 41 tailstock, 42 ​​exterior body, 46 center, 51 base member, 51j seating surface, 52 motor, 53 output shaft, 56 setup side mounting table, 61 conveying device, 62A first arm member, 62B second arm member, 63 connection portion, 66 swivel cover, 70 slide mechanism, 71 lock mechanism, 72 housing, 72a, 73a tapered surface, 73 wedge member, 74 piston cylinder, 75 spring member, 80 Anti-rotation mechanism, 81 pin member, 82 pin insertion hole, 86 connection passage, 91 coupler, 92 first coupler piece, 93 second coupler piece, 100 rotating table unit, 100A first rotating table unit, 100B second rotating table unit, 101 specified axis, 102 swivel center axis, 103 rotation center axis, 110 boundary surface, 120, 120p, 120q fluid passage.

Claims

1. A rotary table on which a workpiece is placed and which can rotate around a predetermined axis; a tailstock disposed opposite the rotary table in the axial direction of the predetermined axis; A rotary table unit comprising: a first support portion supporting the rotary table, a second support portion supporting the tailstock, and a connection portion connecting the first support portion and the second support portion, and a holding member holding the rotary table and the tailstock and fixed in the circumferential direction of the specified axis when the rotary table rotates.

2. The tailstock is a center extending on the predetermined axis; a slide mechanism that slides the center in the axial direction of the predetermined shaft by supplying hydraulic pressure; 2. The rotary table unit according to claim 1, further comprising a locking mechanism that fixes the center at a position where it abuts against a workpiece placed on the rotary table when hydraulic pressure is not supplied to the slide mechanism.

3. A rotary table unit according to claim 1 or 2, A machine tool comprising: a transport device that transports the rotary table unit between the inside and outside of a processing area.

4. A base member provided within the processing area; a coupler that connects a fluid passage between the base member and the rotary table unit when the rotary table unit is placed on the base member; 4. The machine tool according to claim 3, further comprising a rotation prevention mechanism that engages between the base member and the rotary table unit when the rotary table unit is placed on the base member, and restricts rotation of the holding member relative to the base member.

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