Guide bushing device

Abstract

To provide a guide bush device which can be easily applied to a machine tool, and which can properly support a workpiece processed while being held by a main spindle.SOLUTION: A guide bush device 70 is provided in a first turret tool rest 20 so as to be at least movable in a Z-axis direction along an axis line of a main spindle and an X-axis direction crossing the axis line, relative to the main spindle. The guide bush device 70 is a rotary guide bush that comprises a guide bush sleeve 72 and a guide bush 73. The rotary guide bush (the guide bush sleeve 72 and the guide bush 73) guides is rotatably controlled in synchronization with the rotation of the main spindle so as to guide a workpiece W, which is delivered by the main spindle, while rotating.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This disclosure relates to a guide bush device.

Background Art

[0002] In a machine tool including a spindle and a tool turret, a guide bush device is known that includes a plurality of guide bushes having different hole diameters that are attached to a tool attachment station of the tool turret and rotatably hold the outer diameter of a workpiece to be machined (see, for example, Patent Document 1). Such a machine tool can perform machining that holds a round bar portion of a workpiece and machining that holds a needle portion with a single guide bush device.

[0003] Further, Patent Document 2 discloses a tool rest cutting device having a tool rest disposed around the spindle center line of a lathe, a plurality of guide bush holders disposed around the spindle center line, and a moving mechanism that independently moves the tool rest and each guide bush holder forward and backward with respect to the spindle center line.

[0004] By the way, some machine tools do not mount a guide bush device. Even with such a device, when machining while holding a workpiece by a spindle, especially when machining while holding a workpiece having a small outer diameter or a workpiece having a long length with respect to the outer diameter (short side), the development of a technology that can appropriately support the workpiece has been desired.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] This disclosure has been made in view of the above circumstances, and aims to provide a guide bushing device that is easy to apply to machine tools and can properly support a workpiece being machined while being held on the spindle. [Means for solving the problem]

[0007] The guide bush device of this disclosure is a guide bush device mounted on the tool post of a machine tool comprising a spindle for holding a workpiece and a tool post for machining the workpiece. The guide bush device is provided so as to be at least movable relative to the spindle in a direction along the axis of the spindle and in a direction intersecting the axis, and the guide bush device is a rotary guide bush comprising a rotatably supported guide bush sleeve and a guide bush inserted into the guide bush sleeve. The rotary guide bush is controlled to rotate in synchronization with the rotation of the spindle, thereby guiding the workpiece held by the spindle while it rotates. [Effects of the Invention]

[0008] The guide bush device according to this disclosure is easily applicable to machine tools that do not have a guide bush device installed, and can properly support a workpiece that is being machined while being held on the spindle. [Brief explanation of the drawing]

[0009] [Figure 1] This is a plan view showing the schematic configuration of the main parts of an automatic lathe equipped with a guide bushing device, which is one embodiment of the present invention. [Figure 2] This is a front view of the first turret tool post, seen from the front in the Z-axis direction. [Figure 3] This is a cross-sectional view of the first turret tool post along the Z-axis. [Figure 4] This is a cross-sectional view of the guide bushing device along the Z-axis. [Figure 5]This is a front view of the first turret tool post, seen from the front in the Z-axis direction, after the first turret tool post has been rotated to index the guide bushing device. [Modes for carrying out the invention]

[0010] An example of a machine tool equipped with the guide bush device 70 according to this disclosure, an automatic lathe 100, is described below with reference to the drawings. Figure 1 is a diagram showing the schematic configuration of the main parts of an automatic lathe 100 equipped with a guide bush device 70, which is one embodiment of this disclosure.

[0011] As shown in Figure 1, the automatic lathe 100 has a front spindle 10, a first turret tool post 20, a rear spindle 50, and a second turret tool post 60 mounted on a bed (not shown). In this embodiment, the direction along the axes of the front spindle 10 and the rear spindle 50 is the Z-axis direction, the horizontal direction perpendicular to the Z-axis direction is the X-axis direction, and the vertical direction perpendicular to the Z-axis direction and the X-axis direction is the Y-axis direction. Furthermore, the direction in which the front spindle 10 feeds the workpiece W toward the first turret tool post 20 is forward, and the opposite direction is backward.

[0012] The automatic lathe 100 is equipped with a control device 1 that controls the operation of the entire automatic lathe 100. The control device 1 is connected to the front spindle 10, the first turret tool post 20, the rear spindle 50, the second turret tool post 60, etc. by cables, and controls the operation of each part.

[0013] The front spindle 10 is equipped with a collet chuck (not shown) at its tip, which holds a rod-shaped workpiece W. The front spindle 10 is rotatable around the Z-axis along its axis, thereby allowing the held workpiece W to be rotated around its axis (Z-axis).

[0014] The rear spindle 50 is arranged opposite to the front spindle 10 in front of the front spindle 10 in the Z-axis direction (on the front side in the Z-axis direction from the front end of the front spindle 10). The rear spindle 50 also has a collet chuck (not shown) at its tip, and by means of this collet chuck, the rear spindle 50 can receive and hold the workpiece W held by the front spindle 10.

[0015] The rear spindle 50 is also rotatable about the Z-axis along its axis, and thereby, the held workpiece W can be rotated about the axis (Z-axis). The rear spindle 50 can be freely moved in the Z-axis direction and the X-axis direction, for example, by a known moving mechanism.

[0016] The first turret tool post 20 is arranged in parallel with the front spindle 10 in front of the front spindle 10 in the Z-axis direction (on the front side in the Z-axis direction from the front end of the front spindle 10). The first turret tool post 20 performs machining on the workpiece W held by the front spindle 10 or the workpiece W held by the rear spindle 50 with a predetermined tool. Also, the first turret tool post 20 is configured such that the guide bush device 70 can be detachably attached.

[0017] The second turret tool post 60 is arranged in parallel with the rear spindle 50 in front of the rear spindle 50 in the Z-axis direction (on the front side in the Z-axis direction from the front end of the rear spindle 50). The second turret tool post 60 performs machining on the workpiece W held by the rear spindle 50 or the workpiece W held by the front spindle 10 with a tool. Also, the second turret tool post 60 is configured such that the guide bush device 70 can be detachably attached.

[0018] The first turret tool post 20 and the second turret tool post 60 can be freely moved in the X-axis direction and the Z-axis direction by a known moving mechanism. That is, the first turret tool post 20 and the second turret tool post 60 can be freely moved in the X-axis direction and the Z-axis direction with respect to the front spindle 10 and / or the rear spindle 50.

[0019] In addition, the first turret tool rest 20 and the second turret tool rest 60 may be movable relative to the front spindle 10 and / or the rear spindle 50 at least in the X-axis direction and the Z-axis direction. For example, when the front spindle 10 does not move in the X-axis direction or the Z-axis direction, the first turret tool rest 20 moves in the X-axis direction and / or the Z-axis direction. Either the second turret tool rest 60 or the rear spindle 50 may be movable in the X-axis direction and / or the Z-axis direction, or both may be movable in the X-axis direction and / or the Z-axis direction. The first turret tool rest 20 and the second turret tool rest 60 may be freely movable in the Y-axis direction relative to the front spindle 10 and / or the rear spindle 50 by a known moving mechanism.

[0020] FIG. 2 is a front view of the first turret tool rest 20 as seen from the front in the Z-axis direction of the first turret tool rest 20. FIG. 3 is a cross-sectional view of the first turret tool rest 20 along the Z-axis. FIG. 4 is a cross-sectional view of the guide bush device 70 along the Z-axis.

[0021] As shown in FIG. 2, the first turret tool rest 20 mainly includes a main body 21, a turret 22 having a turret surface (mounting surface) 22a, and a drive mechanism such as a tool rotation motor 28. The main body 21 and the turret 22 are arranged side by side along the Z-axis direction. As shown in FIG. 1, the second turret tool rest 60 mainly includes a main body 61, a turret 62 having a turret surface (mounting surface) 62a, and a drive mechanism (not shown). The main body 61 and the turret 62 are arranged side by side along the Z-axis direction.

[0022] The detailed configuration of the first turret tool rest 20 will be described as follows. Since the second turret tool rest 60 can be configured in the same manner as the first turret tool rest 20, detailed description thereof will be omitted.

[0023] As shown in FIG. 2, when viewed from the front in the Z-axis direction, the turret 22 has a prismatic outer shape. The turret 22 is attached to the main body 21 so as to be rotatable by rotating a turret rotation axis 25 around the Z-axis with the axis of the prism along the Z-axis.

[0024] The turret 22 has multiple (12 in Figure 2) flat turret surfaces 22a on the circumferential surface around the axis of the rectangular prism. A tool holder 90 is attached to each turret surface 22a, to which a cutting tool 91, such as a cutting tool, is mounted, as shown by the dashed dotted line. In addition, rotary tools or tool units other than cutting tools, such as drills and end mills, may also be attached to the turret surfaces 22a. In this embodiment, a guide bush device 70 is attached to one of the turret surfaces 22a. The guide bush device 70 may be attached to any of the multiple turret surfaces 22a.

[0025] The first turret tool post 20 moves in the X-axis and Z-axis directions, and the turret 22 rotates around the turret pivot axis (see Figure 3) 25, bringing the tool holder 90 and tool attached to the turret surface 22a into contact with the workpiece W, which is held and rotated on the front spindle 10, at the selected pivot position. This allows the tool to machine the workpiece W.

[0026] The first turret tool post 20 positions a guide bush device 70, attached to the turret surface 22a, at a selected rotational position as the turret 22 rotates around the turret pivot axis 25 (see Figure 3). The guide bush device 70 guides the workpiece W, which is held and rotated by the front spindle 10, as it rotates in sync with the rotation of the front spindle 10. The workpiece W, held by the front spindle 10 and the guide bush device 70, is machined by the tool on the second turret tool post 60.

[0027] As shown in Figure 3, a hollow fixed shaft 23 is fixed inside the hollow main body 21 along the Z-axis direction. This fixed shaft 23 rotatably supports a hollow tool rotation drive shaft 24 inserted inside via bearings. A turret swivel shaft 25 is rotatably arranged on the outer circumference of the fixed shaft 23. A pipe 26 is arranged inside the tool rotation drive shaft 24. The pipe 26 is fixed to the main body 21.

[0028] The tool rotation drive shaft 24 and the turret rotation shaft 25 are both rotatable around the Z-axis. The tool rotation drive shaft 24 and the turret rotation shaft 25 rotate independently of each other.

[0029] The tool rotation drive shaft 24 rotates around the Z-axis, thereby rotating a rotary tool such as a drill attached to the turret 22 around the axis of the rotary tool. In this embodiment, the tool rotation drive shaft 24 also rotates the guide bush sleeve 72 and guide bush 73 of the guide bush device 70 attached to the turret 22 around the Z-axis.

[0030] The turret pivot axis 25 rotates around the Z-axis, thereby rotating the turret 22 around the Z-axis relative to the main body 21.

[0031] A first pulley 27a is attached to one end (rear side) of the tool rotation drive shaft 24. The main body 21 is equipped with a tool rotation motor 28, and a second pulley 27b is attached to the motor shaft 28a of this tool rotation motor 28. The first pulley 27a and the second pulley 27b are linked via a belt 29, and the rotational driving force of the tool rotation motor 28 is transmitted to the tool rotation drive shaft 24 via the first pulley 27a, the belt 29, and the second pulley 27b. A first bevel gear 30 is attached to the other end (front side) of the tool rotation drive shaft 24.

[0032] A turret slewing gear 31 is integrally attached to one end of the turret slewing shaft 25. Driving force is transmitted to the turret slewing gear 31 from a turret slewing motor (not shown). A turret 22 is integrally fixed to the other end of the turret slewing shaft 25.

[0033] A sliding shaft 32 is provided on the outside of the turret pivot axis 25 via a bearing so as to be slidable in the Z-axis direction. One end of the sliding shaft 32 constitutes a piston 34 that is inserted into a cylinder chamber 33 formed in the main body 21. A first coupling element 35a, which constitutes a three-part coupling mechanism 35, is integrally fixed to one end of the sliding shaft 32. Second and third coupling elements 35b and 35c, which face the first coupling element 35a, are integrally fixed to the main body 21 side and the turret pivot axis 25 side, respectively. The three-part coupling mechanism 35 is composed of the first, second, and third coupling elements 35a, 35b, and 35c.

[0034] By operating the piston 34 and moving the sliding shaft 32 toward the turret 22 (forward), the first coupling element 35a engages with the second and third coupling elements 35b and 35c. The third coupling element 35c on the turret pivot axis 25 side engages with the second coupling element 35b on the main body 21 side via the first coupling element 35a, thereby restricting the rotation of the turret pivot axis 25. Furthermore, by sliding the sliding shaft 32 to release the engagement between the first coupling element 35a and the second and third coupling elements 35b and 35c, the second coupling element 35b and the third coupling element 35c separate, allowing the turret pivot axis 25 to rotate.

[0035] The turret pivot axis 25 is allowed to rotate, and when the turret pivot axis 25 is driven to rotate, the turret 22 rotates. When the rotation of the turret pivot axis 25 is restricted at a predetermined rotation angle position, index rotation of the turret 22 is performed. The index rotation of the turret 22 selects a predetermined turret surface 22a of the turret 22, thereby selecting a predetermined tool holder 90 or guide bush device 70.

[0036] A support portion 36, located inside the hollow turret 22, is integrally fixed to the tip of the fixed shaft 23. The support portion 36 is integrally fixed to the main body 21 via the fixed shaft 23. The tool rotation transmission shaft 37 is rotatably supported on the support portion 36. A second bevel gear 38 is attached to one end of the tool rotation transmission shaft 37. The second bevel gear 38 meshes with the first bevel gear 30, and driving force is transmitted from the tool rotation drive shaft 24 to the tool rotation transmission shaft 37.

[0037] A tool swivel motor unit 40 is fixed to the support section 36 via a bracket 39. The tool swivel motor unit 40 includes a tool swivel motor 41, a second motor shaft 41a that transmits the driving force of the tool swivel motor 41, and the like. When a tool unit capable of machining by swiveling a rotary tool is installed on the turret surface 22a, for example, the swivel driving force from the tool swivel motor unit 40 is transmitted via the second motor shaft 41a to swivel the rotary tool to a predetermined angle with an axis perpendicular to the turret surface 22a, enabling machining at a desired angle. Electrical wiring connected to the tool swivel motor 41 is routed outside through a hollow pipe 26 and connected to the control device 1.

[0038] Each turret surface 22a has a hollow, cylindrical fixing portion 22b. A tool holder 90 or guide bush device 70, to which a tool 91 is mounted, is detachably fixed to the fixing portion 22b.

[0039] On the other end of the tool rotation transmission shaft 37 (opposite the second bevel gear 38), there is a groove 42 that engages with a tenon-shaped projection 82, which will be described later, when the guide bush device 70 or the tool holder 90 is selected by the indexing rotation of the turret 22. This groove 42 and the tenon-shaped projection 82 constitute a drive force transmission section that transmits the rotational driving force of the tool rotation motor 28 to the rotational driving force transmission mechanism 76 of the guide bush device 70 or the rotational driving force transmission mechanism of the tool holder 90 (not shown), which will be described later.

[0040] As shown in Figures 3 and 4, the guide bush device 70 is a rotary guide bush mainly comprising a guide bush holder 71, a guide bush sleeve 72, a guide bush 73, a first bearing (angular contact ball bearing) 74, a first spur gear 75, and a rotational drive force transmission mechanism 76.

[0041] The rod-shaped workpiece W, which is machined by the front spindle 10, is inserted into and supported by the guide bush 73, and is guided toward the second turret tool post 60 by the guide bush device 70.

[0042] The guide bush holder 71 is detachably fixed to the fixed portion 22b of the turret 22. A guide bush sleeve 72 is inserted inside the guide bush holder 71. A first bearing 74 is positioned between the guide bush holder 71 and the guide bush sleeve 72.

[0043] The guide bush sleeve 72 is rotatable around the Z-axis relative to the guide bush holder 71 via the first bearing 74. The first spur gear 75 is mounted on the rear outer circumference of the guide bush sleeve 72. The first spur gear 75 and the guide bush sleeve 72 are rotatable integrally around the Z-axis via keys (not shown) that are provided on each and engage with each other. The position of the first spur gear 75 in the Z-axis direction is fixed by a fixture (not shown).

[0044] A guide bush 73 is inserted inside the guide bush sleeve 72. The front side of the guide bush 73 is provided with a notch (not shown) that extends in the Z-axis direction. The front outer surface of the guide bush 73 is provided with a first taper 73a, the outer diameter of which decreases towards the rear.

[0045] The guide bush 73 is rotatable integrally with the guide bush sleeve 72 around the Z-axis, while the guide bush 73 is displaceable in the Z-axis direction relative to the guide bush sleeve 72.

[0046] The inner circumferential surface on the front side of the guide bush sleeve 72 is provided with a second taper 72a corresponding to the first taper 73a, where the inner diameter decreases as it approaches the rear. When the guide bush 73 is displaced rearward along the Z-axis relative to the guide bush sleeve 72, the first taper 73a is pressed against the second taper 72a, and the slit is adjusted in a direction that reduces the diameter of the front end. As a result, the inner diameter (opening) of the front side of the guide bush 73 changes using a guide bush opening adjustment mechanism (not shown).

[0047] When the first spur gear 75 is driven to rotate around axis Z, the guide bush sleeve 72 and the guide bush 73 rotate together with the first spur gear 75.

[0048] The rotational drive force transmission mechanism 76 mainly comprises a second bearing 77, a first rotational drive force transmission shaft 78, a third bearing 79, and a second rotational drive force transmission shaft 80. The first rotational drive force transmission shaft 78 is rotatably inserted and supported within a guide bush holder 71 via the second bearing 77. A third bevel gear 81 is provided at one end of the first rotational drive force transmission shaft 78.

[0049] A tenon-shaped projection 82 is provided at the other end of the first rotational drive force transmission shaft 78. The tenon-shaped projection 82 is configured to engage (fit) with the groove 42 of the tool rotation transmission shaft 37 in a detachable manner when the turret 22 is rotated and the guide bush device 70 is selected. When the tenon-shaped projection 82 is engaged with the groove 42, the rotational drive force transmitted to the tool rotation transmission shaft 37 can be transmitted to the first rotational drive force transmission shaft 78.

[0050] The second rotational drive force transmission shaft 80 is rotatably inserted and supported within a guide bush holder 71 via a third bearing 79 along the Z-axis direction. A fourth bevel gear 83 is provided on one end (rear side) of the second rotational drive force transmission shaft 80. The first rotational drive force transmission shaft 78 and the second rotational drive force transmission shaft 80 are linked by the meshing of the fourth bevel gear 83 and the third bevel gear 81. A second spur gear 84 is provided on the side of the second rotational drive force transmission shaft 80 where the fourth bevel gear 83 is located (rear side). The second spur gear 84 meshes with the first spur gear 75.

[0051] In the rotational drive force transmission mechanism 76, when the tenon-shaped projection 82 of the first rotational drive force transmission shaft 78 engages with the groove 42 and rotational drive force is transmitted from the tool rotation transmission shaft 37 to the first rotational drive force transmission shaft 78, the rotational drive force is transmitted from the first rotational drive force transmission shaft 78 to the first spur gear 75 via the third bevel gear 81, the fourth bevel gear 83, the second rotational drive force transmission shaft 80, and the second spur gear 84. As a result, the guide bush sleeve 72 and the guide bush 73 rotate integrally with the first spur gear 75.

[0052] The tool holder 90 is provided with a swivel drive force transmission mechanism (not shown) and a rotational drive force transmission mechanism inside the turret 22. The swivel drive force transmission mechanism is connected to the second motor shaft 41a when the turret 22 is indexed. The rotational drive force of the tool swivel motor 41 is transmitted to the swivel drive force transmission mechanism via the second motor shaft 41a, causing the tool holder 90 to swivel around the axis of the second motor shaft 41a. The rotational drive force transmission mechanism is connected to the tool rotation transmission shaft 37 by engagement between a tenon-shaped projection (not shown) and a groove 42, similar to the guide bush device 70. The rotational drive force transmission mechanism rotates the tool 91 by receiving the rotational drive force from the tool rotation transmission shaft 37.

[0053] The automatic lathe 100 configured as described above can have a guide bushing device 70 attached to one turret surface 22a of the first turret tool post 20, and a tool holder 90 attached to the other turret surface 22a. When machining a workpiece W held on the front spindle 10 by a tool using the first turret tool post 20, the turret 22 is rotated, and the desired tool holder 90 is positioned at the selected rotation position. The tool 91 attached to the selected tool holder 90 can be used to machine the workpiece W that is held and rotating on the front spindle 10.

[0054] On the other hand, when machining a workpiece W with a relatively small outer diameter or a workpiece W that is susceptible to load during machining, it is preferable to use the guide bush device 70. In this case, as shown in Figure 5, the turret 22 is rotated, and the guide bush device 70 is positioned at the selected rotation position. Under the control of the control device 1, the first turret tool post 20 is moved in the X-axis and Z-axis directions to align with the front spindle 10. This alignment ensures that the axis of the guide bush 73 coincides with the axis of the front spindle 10, and the guide bush 73 is positioned to hold the workpiece W held by the front spindle 10. In the second turret tool post 60, the desired tool holder 90 is indexed and moved in the X-axis and Z-axis directions to position it in a location where the workpiece W guided by the guide bush device 70 can be machined.

[0055] The tool rotation motor 28 is rotated in synchronization with the rotation of the front spindle 10 under the control of the control device 1. The rotational driving force of the tool rotation motor 28 is transmitted to the rotational driving force transmission mechanism 76 via the tool rotation drive shaft 24 and the tool rotation transmission shaft 37, causing the guide bush sleeve 72 and the guide bush 73 to rotate together. The guide bush 73 guides the workpiece W, which is held while being rotated by the front spindle 10, while rotating in synchronization with the front spindle 10. The workpiece W is machined by the tool on the second turret tool post 60.

[0056] Since the workpiece W is supported by the guide bushing device 70, deformation such as distortion and warping of the workpiece W due to loads such as cutting is appropriately suppressed. In particular, deformation is appropriately suppressed for workpieces W with small outer diameters or workpieces W with a long length relative to their outer diameter (short length), allowing for more precise machining. Moreover, since the guide bushing device 70 of this embodiment guides the workpiece W while rotating in synchronization with the rotation of the front spindle 10 and the rear spindle 50, deformation and damage to the workpiece W are more appropriately suppressed. Therefore, the automatic lathe 100 can improve the machining accuracy of the workpiece W.

[0057] The tool post of this embodiment comprises a main body 21, 61, turrets 22, 63 rotatably supported by the main body 21, 61, and a turret tool post (first turret tool post 20, second turret tool post 60) equipped with a drive mechanism. The guide bush device 70 of this embodiment can be attached to the turret surfaces 22a, 62a of such a turret tool post. The drive mechanism for rotating the tool can be used as the driving force to rotate the guide bush sleeve 72 and guide bush 73 of the guide bush device 70, eliminating the need to provide a separate drive mechanism. As a result, the control device 1 can easily control the guide bush device 70 and reduce manufacturing costs.

[0058] The guide bush device 70 of this embodiment can also be applied to machine tools that do not have a guide bush device. Therefore, the machine tool can properly support the workpiece W with the front spindle 10 and the guide bush device 70, appropriately suppressing deformation and enabling more precise machining of the workpiece W. The machine tool can perform machining without using the guide bush device 70 and machining with the guide bush device 70, and it is also possible to perform high-precision machining of workpieces W with different outer diameters.

[0059] The guide bush device 70 of this embodiment is provided with a swivel drive force transmission mechanism (not shown) and a rotational drive force transmission mechanism inside the turret 22. The swivel drive force transmission mechanism is connected to the second motor shaft 41a when the turret 22 is indexed. The rotational drive force of the tool swivel motor 41 is transmitted to the swivel drive force transmission mechanism via the second motor shaft 41a, making it possible to swivel the rotary guide bush device 70 around the axis of the second motor shaft 41a, similar to how the tool holder 90 is swiveled. Since the first turret tool post 20 is movable in the Z-axis direction, the first turret tool post 20 moves closer to the rear spindle 50, and the rotary guide bush device 70 swivels, guiding the workpiece W held by the rear spindle 50 while rotating in sync with the rear spindle 50. The workpiece W is machined by the tool on the second turret tool post 60.

[0060] The machine tools to which the guide bush device 70 according to this disclosure is applied are not limited to automatic lathes. Furthermore, although the guide bush device 70 according to this disclosure is mounted on a turret tool post, the tool post is not limited to a turret tool post. The tool post may be a so-called comb-type tool post in which tools such as cutting tools are fixed in parallel to the feed table. The guide bush device 70 according to this disclosure can also be mounted on such a tool post.

[0061] Although embodiments of this disclosure have been described in detail with reference to the drawings above, these embodiments are merely illustrative examples, and this disclosure is not limited to the embodiments described above. [Explanation of Symbols]

[0062] 10: Front spindle (main spindle) 20: First turret weapon rest (weapon rest) 21: Main body 22: Turret 22a: Turret surface (mounting part) 28: Tool Rotation Motor (Drive Mechanism) 61: Main body 62: Turret 50: Back spindle (main spindle) 62: Second Turret Blade Rest (Blade Rest) 62a: Turret surface (mounting part) 63: Turret 70: Guide bushing device 72: Guide bush sleeve 73: Guide bush 91 :Tools W: Work

Claims

[Claim 1] A guide bushing device mounted on the tool post of a machine tool comprising a spindle for holding a workpiece and a tool post for machining the workpiece, The aforementioned tool post is a turret tool post comprising a main body, a turret rotatably supported by the main body, and a drive mechanism for rotating a tool attached to the turret. The turret has a circumferential surface around a pivot axis and an end surface perpendicular to the pivot axis, the circumferential surface is divided into multiple sections, and each of the tools is positioned relative to the spindle at a pivot position selected by rotating around the pivot axis. The guide bush device is detachably attached to one of the mounting surfaces and is rotationally driven by the drive mechanism, and is provided to be movable relative to the main spindle in at least in a direction along the axis of the main spindle and in a direction intersecting the axis. The aforementioned guide bush device is A rotatably supported guide bush sleeve, A rotary guide bush comprising a guide bush inserted into the guide bush sleeve, The guide bush device is characterized in that the rotary guide bush is controlled to rotate in synchronization with the rotation of the spindle, thereby guiding the workpiece held by the spindle while it rotates.

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