Workpiece support device for machine tools, machine tool and method for using a machine tool

Abstract

The present application provides a workpiece support device for a machine tool, a machine tool, and a method for using the machine tool. The workpiece support device for a machine tool includes a rotating shaft that supports a workpiece and is rotatable about a first axis; a first support device that has a through-hole portion that supports a guide sleeve adapter and can accommodate a front end portion of the rotating shaft in the through-hole portion; a second support device that supports the rotating shaft and can relatively move the rotating shaft relative to the first support device in a direction parallel to the first axis; and an accessory that is in contact with an outer surface of the front end portion of the rotating shaft or an inner surface of the through-hole portion. At least a portion of the accessory arranged on the rotating shaft can be displaced in a direction away from the first axis, or at least a portion of the accessory arranged on the through-hole portion of the first support device can be displaced in a direction approaching the first axis.

Description

Technical Field

[0001] This invention relates to a workpiece support device for machine tools, a machine tool, and a method of using the machine tool. Background Technology

[0002] There are known machine tools that use guide bushes to process long workpieces while suppressing their deflection.

[0003] As a related technology, Patent Document 1 discloses a spindle-moving lathe. The spindle-moving lathe described in Patent Document 1 includes a spindle for holding a workpiece, a spindle table, a guide bush holder located in front of the spindle and having a guide bush that can slidably guide the workpiece, and a support table for mounting the guide bush holder. The guide bush holder is detachable from the support table. Furthermore, in the spindle-moving lathe described in Patent Document 1, instead of the guide bush holder, a cover member having a protective hole for inserting into the front end of the spindle can be installed at a position corresponding to the guide bush. Existing technical documents Patent documents

[0004] Patent Document 1: Japanese Patent Publication No. JP9-225703 Summary of the Invention The technical problem to be solved by the present invention

[0005] The purpose of this invention is to provide a workpiece support device for a machine tool, a machine tool, and a method of using the machine tool, which can suppress the deflection of the rotating shaft when the rotating shaft is arranged in a through hole capable of supporting a guide bush adapter. Technical solutions for solving technical problems

[0006] Several embodiments of a workpiece support device for a machine tool include: a rotating shaft supporting a workpiece and rotatable about a first axis; a first support device having a through-hole portion capable of supporting and holding a guide sleeve adapter, and capable of receiving the front end portion of the rotating shaft in the through-hole portion; a second support device supporting the rotating shaft, allowing the rotating shaft to move relative to the first support device in a direction parallel to the first axis; and an attachment contacting an outer surface disposed on the front end portion of the rotating shaft or an inner surface of the through-hole portion. At least a portion of the attachment is displaceable in a direction away from the first axis, such that a first distance between the outermost part of the attachment disposed at the front end portion of the rotating shaft and the first axis is greater than a second distance between the outermost surface of the front end portion of the rotating shaft and the first axis; or, at least a portion of the attachment is displaceable in a direction closer to the first axis, such that a third distance between the innermost part of the attachment disposed in the through-hole portion and the first axis is less than a fourth distance between the innermost surface of the through-hole portion and the first axis.

[0007] Several embodiments of the machine tool include: a workpiece support device; a tool holding device for holding a tool; and a second drive device for moving the tool holding device. The workpiece support device includes: a rotating shaft supporting a workpiece and rotatable about a first axis; a first support device having a through-hole portion capable of supporting a guide sleeve adapter for holding a guide sleeve, and capable of receiving the front end portion of the rotating shaft in the through-hole portion; a second support device supporting the rotating shaft, allowing the rotating shaft to move relative to the first support device in a direction parallel to the first axis; and an attachment contacting an outer surface disposed on the front end portion of the rotating shaft or an inner surface of the through-hole portion. At least a portion of the attachment is displaceable in a direction away from the first axis such that a first distance between the outermost part of the attachment disposed at the front end portion of the rotating shaft and the first axis is greater than a second distance between the outermost surface of the front end portion of the rotating shaft and the first axis; or, at least a portion of the attachment is displaceable in a direction closer to the first axis such that a third distance between the innermost part of the attachment disposed in the through-hole portion and the first axis is less than a fourth distance between the innermost surface of the through-hole portion and the first axis.

[0008] In several embodiments of the machine tool, the machine tool includes: a workpiece support device; a tool holding device for holding a tool; and a second drive device for moving the tool holding device. The workpiece support device includes: a rotating shaft rotatable about a first axis; a first support device having a through-hole portion capable of supporting a guide sleeve adapter for holding a guide sleeve, and capable of receiving the front end portion of the rotating shaft in the through-hole portion; a second support device supporting the rotating shaft, allowing the rotating shaft to move relative to the first support device in a direction parallel to the first axis; and an accessory that contacts the outer surface of the front end portion of the rotating shaft or the inner surface of the through-hole portion. Furthermore, the method of using the machine tool includes: a first rotation step, in which a first workpiece held by the front end of the rotating shaft and supported by the guide sleeve is rotated about the first shaft; a first machining step, in which the first workpiece is machined by the cutting tool during the execution of the first rotation step; a removal step, in which the guide sleeve adapter is removed from the through hole; a placement step, in which the front end of the rotating shaft is placed inside the through hole by moving the rotating shaft in a direction parallel to the first shaft; a second rotation step, in which the front end of the rotating shaft and a second workpiece held by the front end rotate together about the first shaft; and a second machining step, in which the second workpiece is machined by the cutting tool during the execution of the second rotation step. The second machining step is performed when the first distance between the outermost part of the attachment disposed at the front end of the rotating shaft and the first shaft is greater than the second distance between the outermost surface of the front end of the rotating shaft and the first shaft, or when the third distance between the innermost part of the attachment disposed at the through hole and the first shaft is less than the fourth distance between the innermost surface of the through hole and the first shaft. Invention Effects

[0009] According to the present invention, a workpiece support device for a machine tool, a machine tool, and a method of using the machine tool are provided, wherein the deflection of the rotating shaft is suppressed when the rotating shaft is arranged in a through hole portion capable of supporting the guide sleeve adapter. Attached Figure Description

[0010] Figure 1 This is a schematic cross-sectional view of the machine tool according to the first embodiment. Figure 2 This is a schematic cross-sectional view of the machine tool according to the first embodiment. Figure 3 This is a schematic cross-sectional view of the machine tool according to the first embodiment. Figure 4 This is a schematic cross-sectional view showing a portion of the machine tool according to the first embodiment. Figure 5This is a schematic cross-sectional view showing a portion of the machine tool according to the first embodiment. Figure 6 Is Figure 5 An enlarged view of region A, enclosed by a square with a single-dot dash. Figure 7 Is Figure 5 An enlarged view of region A, enclosed by a square with a single-dot dash. Figure 8 This is a diagram illustrating an example of an attachment. Figure 9 yes Figure 8 BB arrow cross-section diagram. Figure 10 This is a diagram showing another example of the appendix. Figure 11 yes Figure 10 CC arrow cross-section diagram. Figure 12 This is a schematic diagram illustrating an example of a nut. Figure 13 This is a schematic cross-sectional view showing a portion of the machine tool according to the first embodiment. Figure 14 This is a schematic cross-sectional view of the machine tool according to the first embodiment. Figure 15 This is a schematic cross-sectional view of a machine tool representing a variation of the first embodiment. Figure 16 Is Figure 15 An enlarged view of region D, which is enclosed by a square with a single-dot dash. Figure 17 This is a schematic cross-sectional view of a machine tool representing a variation of the first embodiment. Figure 18 Is Figure 17 An enlarged view of region E, enclosed by a square with a single-dot dash. Figure 19 This is a schematic cross-sectional view of the machine tool according to the second embodiment. Figure 20 This is a schematic cross-sectional view showing a portion of the machine tool according to the second embodiment. Figure 21 This is a schematic cross-sectional view of the machine tool according to the second embodiment. Figure 22 This is a schematic cross-sectional view showing a portion of the machine tool according to the second embodiment. Figure 23 Is Figure 22 An enlarged view of the region H enclosed by a square with a single-dot dashed line. Figure 24 Is Figure 20 An enlarged view of the region F enclosed by a square with a single-dot dashed line. Figure 25 This is a schematic cross-sectional view of the machine tool according to the third embodiment. Figure 26 This is a schematic cross-sectional view of the machine tool according to the third embodiment. Figure 27 Is Figure 26 An enlarged view of the region N enclosed by a square with a single-dot dashed line. Figure 28 Is Figure 26 An enlarged view of the region N enclosed by a square with a single-dot dashed line. Figure 29 This is a schematic cross-sectional view of the machine tool according to the third embodiment. Figure 30 This is a schematic cross-sectional view of a portion of a machine tool in a first variation of the third embodiment. Figure 31 This is a diagram illustrating an example of the steps for installing an accessory onto the front end of a rotating shaft. Figure 32 This is a flowchart illustrating an example of how to use a machine tool according to an implementation method. Figure 33 This is a flowchart illustrating an example of how to use a machine tool according to an implementation method. Detailed Implementation

[0011] Hereinafter, the workpiece support device 1 for a machine tool, the machine tool 100, and the method of using the machine tool according to the embodiments will be described with reference to the accompanying drawings. In addition, in the following description of the embodiments, parts and components with the same function will be labeled with the same reference numerals, and repeated descriptions of parts and components labeled with the same reference numerals will be omitted.

[0012] (Definition of direction) In this specification, the direction from the rear end 21 of the rotating shaft 2 toward the front end 22 of the rotating shaft 2 is defined as "first direction DR1", and the direction from the front end 22 of the rotating shaft 2 toward the rear end 21 of the rotating shaft 2 is defined as "second direction DR2".

[0013] (First Implementation) Reference Figures 1 to 18 The workpiece support device 1A for machine tools and the machine tool 100A of the first embodiment will be described. Figures 1 to 3 This is a schematic cross-sectional view of the machine tool 100A according to the first embodiment. Figure 4 as well as Figure 5 This is a schematic cross-sectional view showing a portion of the machine tool 100A according to the first embodiment. Figure 6 Is Figure 5 An enlarged view of region A, enclosed by a square with a single-dot dash. Figure 7 Is Figure 5 An enlarged view of region A, enclosed by a square with a single-dot dashed line. Additionally, Figure 7 express Figure 6 Appendix 51 shows the state after displacement in a direction away from the first axis AX. Figure 8 This is a diagram illustrating an example from Annex 51. Figure 9 yes Figure 8 BB arrow cross-section diagram. Figure 10 This is a diagram illustrating another example from Annex 51. Figure 11 yes Figure 10 CC arrow cross-section diagram. Figure 12 This is a schematic diagram illustrating an example of nut 28. Figure 13 This is a schematic cross-sectional view showing a portion of the machine tool 100A according to the first embodiment. Figure 14 This is a schematic cross-sectional view of the machine tool 100A according to the first embodiment. Figure 15 This is a schematic cross-sectional view of a machine tool 100A, representing a modified example of the first embodiment. Figure 16 Is Figure 15 An enlarged view of region D, which is enclosed by a square with a single-dot dash. Figure 17 This is a schematic cross-sectional view of a machine tool 100A, representing a modified example of the first embodiment. Figure 18 Is Figure 17 An enlarged view of region E, enclosed by a square with a single-dot dash.

[0014] The workpiece support device 1A for a machine tool according to the first embodiment includes a rotating shaft 2, a first support device 3, a second support device 6, and an accessory 51.

[0015] Rotary shaft 2 supports the workpiece (in other words, the object being processed) and is capable of rotating about a first axis AX. Rotary shaft 2 has a rear end 21 and a front end 22. Figure 1 In the example described, a collet 25 is provided at the front end 22 of the rotating shaft 2. In this case, the rotating shaft 2 supports the workpiece via the collet 25.

[0016] The first support device 3 has a through hole 3h capable of supporting the guide bush unit 9, and more specifically, has a through hole 3h capable of supporting and holding the guide bush adapter 92 of the guide bush 91. The guide bush adapter 92 can be installed in the through hole 3h. Figure 1 The image shows the state before the guide sleeve adapter 92 is installed into the through hole portion 3h of the first support device 3. Figure 2The diagram shows the state 3 hours after the guide sleeve adapter 92 is installed into the through hole of the first support device 3.

[0017] exist Figure 1 In the described example, the guide sleeve unit 9 is composed of multiple components. More specifically, the guide sleeve unit 9 includes a guide sleeve 91 and a guide sleeve adapter 92 that holds the guide sleeve 91. The guide sleeve 91 has a hollow hole 91h for inserting a workpiece. The guide sleeve 91 is held by the guide sleeve adapter 92 by any fixing component such as fitting, snap-fit, or fixing pin. In addition, the guide sleeve adapter 92 is mounted to the first support device 3 by any fixing component such as fitting, snap-fit, or fixing pin.

[0018] exist Figure 2 In the described example, the first part Wa of the workpiece W (more specifically, the front end of the workpiece W) is supported by the guide sleeve 91 in a manner that allows it to move relative to the guide sleeve 91 in the first direction DR1. Additionally, the second part Wb of the workpiece W (more specifically, the central portion of the workpiece W along its long side or the base end of the workpiece W) is held by the rotation shaft 2.

[0019] The second support device 6 supports the rotating shaft 2. Furthermore, the second support device 6 allows the rotating shaft 2 to move relative to the first support device 3 in a direction parallel to the first axis AX. If the rotating shaft 2 moves relative to the first support device 3 in a direction parallel to the first axis AX, the workpiece W held by the rotating shaft 2 moves in the same direction (see reference). Figure 3 (Arrow AR1 in the diagram). Thus, by moving the rotation axis 2 in a direction parallel to the first axis AX, the second support device 6 can change the machining position of the workpiece W processed by the tool T.

[0020] exist Figure 3 In the described example, since the workpiece W is supported by the rotating shaft 2 and the guide sleeve 91, deflection of the workpiece W can be suppressed during its machining. In other words, in Figure 3 In the described example, the machining of a long workpiece (hereinafter referred to as "the long workpiece" as "the first workpiece W1") supported by both the rotating shaft 2 and the guide sleeve 91 can be appropriately performed. On the other hand, for Figure 3 With the illustrated configuration of the rotating shaft 2, machining the short workpiece (hereinafter referred to as "the short workpiece" as "the second workpiece W2") is difficult.

[0021] Therefore, in the first embodiment, the workpiece support device 1A for a machine tool is configured such that the through hole portion 3h of the first support device 3 can accommodate the front end portion 22 of the rotating shaft 2. More specifically, as... Figure 4 As illustrated in the example, remove the guide sleeve unit 9 from the through hole portion 3h, and then, as shown in the example. Figure 5As illustrated, by moving the rotating shaft 2 in the first direction DR1, the front end portion 22 of the rotating shaft 2 is inserted into the through hole portion 3h.

[0022] By moving the rotating shaft 2, the second support device 6 can position the front end 22 of the rotating shaft 2 at a first position closer to the second direction DR2 side than the through hole 3h of the first support device 3 (see reference). Figure 4 The second position (referring to) is located on the inner side of the through hole portion 3h or on the side closer to DR1 in the first direction than the through hole portion 3h. Figure 5 Move between ) . Additionally, in Figure 4 In the middle, the first position is any position located on the end 3e of the second direction DR2 side, which is closer to the second direction DR2 than the through hole 3h of the first support device 3. Figure 5 In the middle, the second position is any position of the end 3e located on the second direction DR2 side of the through hole 3h, close to the first direction DR1.

[0023] When the front end 22 of the rotating shaft 2 is in the second position (refer to...) Figure 5 When this is done, the second workpiece W2, held by the front end 22 of the rotating shaft 2, can be machined using the tool T. However, if... Figure 6 As illustrated, when the front end portion 22 of the rotating shaft 2 is located inside the through hole 3h, a gap G1 exists between the outermost surface 222t of the front end portion 22 and the inner surface 32n of the through hole 3h. Due to the presence of this gap G1, if a large cutting load is applied to the second workpiece W2 by the tool T, the deflection of the rotating shaft 2 will increase. For example, the rotating shaft 2 may deflect before the outermost surface 222t of the front end portion 22 contacts the inner surface 32n of the through hole 3h. Therefore, if a large cutting load is applied to the second workpiece W2 by the tool T, the machining accuracy of the second workpiece W2 will decrease.

[0024] Therefore, the workpiece support device 1A for machine tools has an accessory 51 that contacts the outer surface 22t of the front end 22 of the rotating shaft 2. Figure 6 In the example described, accessory 51 is installed on the front end 22 of the rotating shaft 2. Alternatively, in this specification, accessory 51, which contacts the outer surface 22t of the front end 22 of the rotating shaft 2, may also be referred to as the "first accessory".

[0025] like Figure 6 as well as Figure 7 As illustrated, at least a portion of attachment 51 can be displaced in a direction away from the first axis AX. By enabling at least a portion of attachment 51 to be displaced in a direction away from the first axis AX, the gap G2 between the outer surface 51t of attachment 51 and the inner surface 32n of the through hole 3h can be reduced (see reference). Figure 7Thus, attachment 51 can reduce the displacement of the front end 22 of the rotating shaft 2 in the direction perpendicular to the first axis AX.

[0026] More specifically, at least a portion of attachment 51 is displaceable in a direction away from the first axis AX, so that the outermost 511t of attachment 51, which is configured to contact the outer surface 22t of the front end portion 22, is positioned to do so. Figure 7 In the described example, the outermost 511t of attachment 51 is the portion of attachment 51 that is furthest from the first axis AX. The first distance L1 between this outer surface 51t and the first axis AX is greater than the second distance L2 between the outermost surface 222t of the front end portion 22 of the rotating shaft 2 and the first axis AX. Furthermore, the outermost 511t of attachment 51 refers to the portion of attachment 51 that is furthest from the first axis AX. Similarly, the outermost surface 222t of the front end portion 22 of the rotating shaft 2 refers to the surface of the front end portion 22 of the rotating shaft 2 that is furthest from the first axis AX.

[0027] exist Figure 7 In the described example, by making the first distance L1 greater than the second distance L2, the attachment 51 can prevent the outermost surface 222t of the front end portion 22 of the rotating shaft 2 from directly contacting the inner surface 32n of the through hole portion 3h. In other words, when the rotating shaft 2 flexes, the outermost surface 511t of the attachment 51 contacts the inner surface 32n of the through hole portion 3h before the outermost surface 222t of the front end portion 22 of the rotating shaft 2 contacts the inner surface 32n of the through hole portion 3h. In this way, the amount of displacement of the front end portion 22 in the direction perpendicular to the first axis AX can be reduced.

[0028] In the workpiece support device 1A for machine tools according to the first embodiment, the through hole portion 3h of the first support device 3 can support the guide sleeve unit 9. Therefore, a long workpiece (in other words, the first workpiece W1) can be stably supported by the front end portion 22 of the rotating shaft 2 and the guide sleeve 91. In addition, in the workpiece support device 1A for machine tools according to the first embodiment, the through hole portion 3h of the first support device 3 can accommodate the front end portion 22 of the rotating shaft 2. Therefore, a short workpiece (in other words, the second workpiece W2) can be supported by inserting the front end portion 22 of the rotating shaft 2 into the through hole portion 3h. In addition, the workpiece support device 1A for machine tools according to the first embodiment has an attachment 51 that contacts the outer surface 22t of the front end portion 22 of the rotating shaft 2. This attachment 51 can prevent the outermost surface 222t of the front end portion 22 of the rotating shaft 2 from directly contacting the inner surface 32n of the through hole portion 3h. In this way, when the cutting load is applied to the second workpiece W2 by the tool T, the deflection of the rotating shaft 2 can be suppressed. Therefore, in the first embodiment, even under a large cutting load on the second workpiece W2, the deflection of the rotating shaft 2 can be suppressed, and the machining accuracy of the second workpiece W2 can be stably maintained.

[0029] like Figure 1 As illustrated, the machine tool 100A of the first embodiment includes, in addition to the workpiece support device 1A for the machine tool, a tool holding device 110 for holding the tool T and a second drive device 120 for moving the tool holding device 110. The second drive device 120 can move the tool holding device 110 in a direction close to the first axis AX (or in a direction away from the first axis AX).

[0030] (arbitrarily added components) Next, refer to Figures 1 to 18 Any additional configurations that can be used in the workpiece support device 1A for the machine tool and the machine tool 100A according to the first embodiment will be described.

[0031] (Attachment 51) exist Figure 7 In the described example, attachment 51 is disposed between the outer surface 22t of the rotating shaft 2 and the inner surface 32n of the through hole portion 3h. Attachment 51 has an inner surface 51n that contacts the outer surface 22t of the rotating shaft 2 and an outer surface 51t that opposes the inner surface 32n of the through hole portion 3h.

[0032] From the viewpoint of enabling the rotating shaft 2 to move smoothly relative to the through hole 3h in a direction parallel to the first axis AX, it is preferable to have a small gap G2 between the outer surface 51t of the attachment 51 and the inner surface 32n of the through hole 3h. However, the gap G2 between the outer surface 51t and the inner surface 32n of the through hole 3h can also be zero if the contact between them does not impede the movement of the rotating shaft 2 in the direction parallel to the first axis AX. Furthermore, by arranging a rolling element such as a ball or roller, or an elastic body such as an O-ring, on one of the outer surface 51t of the attachment 51 or the inner surface 32n of the through hole 3h, it is also possible to achieve a state in which a preload is applied to both the outer surface 51t and the inner surface 32n.

[0033] exist Figure 6 as well as Figure 7 In the described example, the state of the attachment 51 disposed at the front end 22 of the rotating shaft 2 can be changed from a first distance L1 between the outermost surface 511t of the attachment 51 and the first shaft AX to a first state below a second distance L2 between the outermost surface 222t of the front end 22 of the rotating shaft 2 and the first shaft AX (see reference). Figure 6 The second state is changed so that the first distance L1 between the outermost surface 511t of Annex 51 and the first axis AX is greater than the second distance L2 between the outermost surface 222t of the front end 22 of the rotating shaft 2 and the first axis AX (refer to the second state). Figure 7 However, in the first embodiment, the above-described first state can be achieved (see...). Figure 6 It is not mandatory.

[0034] exist Figure 6 In the described example, at least one of the attachment 51 and the rotating shaft 2 has an inclined surface AS, which converts the relative movement of the attachment 51 relative to the rotating shaft 2 in a direction parallel to the first axis AX into a displacement of at least a portion of the attachment 51 (e.g., the outer surface 51t of the attachment 51) in a direction away from the first axis AX. In this case, by moving the attachment 51 relative to the rotating shaft 2 in a direction parallel to the first axis AX (more specifically, the second direction DR2), the gap G2 between the outer surface 51t of the attachment 51 and the inner surface 32n of the through hole 3h can be reduced. Due to the reduction of this gap G2, the amount of displacement of the front end portion 22 of the rotating shaft 2 in a direction perpendicular to the first axis AX can be reduced.

[0035] exist Figure 6 In the described example, in the cross-section including the first axis AX, attachment 51 has a wedge shape. More specifically, the end of attachment 51 on the second direction DR2 side has a wedge shape whose thickness decreases as it approaches the second direction DR2. Figure 6 In the described example, the inner surface 51n of attachment 51 has a first inclined surface AS1, and the outer surface 22t of the rotating shaft 2 has a second inclined surface AS2 that contacts the first inclined surface AS1. The first inclined surface AS1 is an inclined surface whose distance from the first shaft AX increases as it moves toward the second direction DR2. Similarly, the second inclined surface AS2 is an inclined surface whose distance from the first shaft AX increases as it moves toward the second direction DR2. In this case, by moving attachment 51 relative to the rotating shaft 2 in the second direction DR2, at least a portion of attachment 51 (e.g., the outer surface 51t of attachment 51) is displaced away from the first shaft AX. Furthermore, by arranging a rolling element such as a roller or ball bearing or an elastic body such as an O-ring on one of the inner surface 51n of attachment 51 and the outer surface 22t of the rotating shaft 2, it is also possible to achieve a state in which a preload is applied to both the inner surface 51n and the outer surface 22t.

[0036] exist Figure 6 In the described example, at least a portion of attachment 51 is capable of increasing its diameter in a direction away from the first axis AX. More specifically, at least a portion of attachment 51 disposed at the front end portion 22 of the rotating shaft 2 is capable of increasing its diameter in a direction away from the first axis AX, such that the first distance L1 between the outermost edge 511t of attachment 51 and the first axis AX is greater than the second distance L2 between the outermost surface 222t of the front end portion 22 of the rotating shaft 2 and the first axis AX. Figure 7 This indicates that at least a portion of Annex 51 has its diameter increased in a direction away from the first axis AX. Figure 7In the example described, when the state of Attachment 51 is an enlarged diameter state, Attachment 51 has a first shape after elastic deformation from the default shape.

[0037] When at least a portion of attachment 51 (in other words, a part or all of attachment 51) can be enlarged in diameter in a direction away from the first axis AX, the size of the gap G2 between the outer surface 51t of attachment 51 and the inner surface 32n of the through hole portion 3h can be easily adjusted. Furthermore, the enlargement of the diameter of at least a portion of attachment 51 can be performed either after attachment 51 is inserted into the through hole portion 3h or before attachment 51 is inserted into the through hole portion 3h.

[0038] exist Figure 7 In the described example, at least a portion of attachment 51 is capable of reducing its diameter in a direction approaching the first axis AX. For example, at least a portion of attachment 51 is capable of reducing its diameter in a direction approaching the first axis AX, such that the first distance L1 between the outermost part 511t of attachment 51 and the first axis AX becomes less than the second distance L2 between the outermost surface 222t of the front end portion 22 of the rotating shaft 2 and the first axis AX. Figure 6 This indicates that at least a portion of Annex 51 has its diameter reduced in a direction approaching the first axis AX. Figure 6 In the examples described, when Annex 51 is in a state with a reduced diameter, Annex 51 has a default shape that is substantially free from stress, or a second shape that has a smaller amount of elastic deformation from the default shape compared to the first shape described above.

[0039] Appendix 51 includes, for example, ring components. Additionally, in this specification, ring components include ring components with slits (e.g., C-shaped ring components), circular ring components, and ring components composed of multiple ring segments. Figure 8 as well as Figure 9 In the described example, Attachment 51 is a ring component 51A that has a C-shaped form when viewed along the direction of the first axis AX. This ring component 51A has a slit 51r. In this case, it is easy to increase the diameter of the entire ring component 51A in a direction away from the first axis AX.

[0040] Instead, such as Figure 10 as well as Figure 11 As illustrated, Annex 51 can also be a ring component 51B that has a circular shape when viewed along the direction of the first axis AX. Figure 11 In the described example, the circular ring component 51B has a circular ring body 515 and a plurality of feet 516 extending from the ring body 515 in a direction along the first axis AX. Figure 11In the described example, a gap G3 is formed between two adjacent feet 516. In this case, it is easy to increase the diameter of a portion of the ring member 51B (more specifically, the plurality of feet 516) in a direction away from the first axis AX.

[0041] In addition, Figures 8 to 11 In the example described, attachment 51 consists of a single ring component. Alternatively, attachment 51 may also consist of multiple ring segments. In this case, grooves or the like may be formed on the outer surface 22t of the rotating shaft 2 to hold each ring segment in order to prevent each ring segment from detaching from the outer surface 22t of the rotating shaft 2.

[0042] (Pressing component 55) exist Figure 6 In the described example, the workpiece support device 1A for a machine tool includes a pressing member 55 that presses the attachment 51 in the second direction DR2. By pressing the attachment 51 in the second direction DR2, the pressing member 55 can move the attachment 51 relative to the rotation axis 2 in a direction parallel to the first axis AX (more specifically, the second direction DR2). In addition, the attachment 51 moves in the second direction DR2 by being pressed by the pressing member 55, thereby displacing the outer surface 51t of the attachment 51 in the direction toward the inner surface 32n of the through hole portion 3h (see reference). Figure 7 This reduces the gap G2 between the outer surface 51t of the attachment 51 and the inner surface 32n of the through hole 3h. The material of the attachment 51 can be softer than the material of the inner surface 32n of the through hole 3h. By making the material of the attachment 51 relatively soft, wear on the inner surface 32n of the through hole 3h can be suppressed when the attachment 51 moves relative to the through hole 3h. Alternatively or additionally, an oil-containing porous material can be used as the material of the attachment 51. By using an oil-containing porous material, sliding properties can be improved and the maintenance frequency reduced.

[0043] exist Figure 6 In the example described, by simply moving the pressing member 55 in the second direction DR2, the outer surface 51t of the attachment 51 is displaced toward the inner surface 32n of the through hole 3h, and as a result, the gap G2 between the outer surface 51t of the attachment 51 and the inner surface 32n of the through hole 3h is reduced.

[0044] exist Figure 7 In the described example, the pressing member 55 has a first threaded portion 551 that converts the rotational force acting on the pressing member 55 into the pressing force of the pressing attachment 51. In other words, the pressing member 55 includes a threaded member 55a capable of converting the rotational force acting on the pressing member 55 into the pressing force of the pressing attachment 51.

[0045] exist Figure 7 In the described example, the threaded component 55a engages with the second threaded portion 28m of a component constituting part of the rotating shaft 2 (e.g., a nut 28 that engages with the rotating shaft body 20). Additionally, in Figure 7 In the described example, the threaded component 55a is a bolt having a recess 552 that engages with a tool K such as a wrench or screwdriver. Alternatively, as... Figure 23 As illustrated, the threaded component 55a can also be a nut 28 (more specifically, a cap nut) that engages with the rotating shaft body 20.

[0046] exist Figure 7 In the described example, the pressing member 55 is composed of multiple components, including a cylindrical collar 55b. Figure 7 In the described example, a cylindrical collar 55b is positioned between the threaded component 55a and the accessory 51. In this case, the threaded component 55a presses the accessory 51 toward the second direction DR2 via the collar 55b. The collar 55b can also be omitted. In other words, the threaded component 55a can also directly press the accessory 51 toward the second direction DR2.

[0047] (Nut 28) exist Figure 7 In the described example, the workpiece support device 1A for the machine tool has a nut 28 (more specifically, a cap nut) to prevent the attachment 51 from falling off the rotating shaft 2. After the attachment 51 is positioned on the outer surface of the rotating shaft 2, the nut 28 is installed on the front end of the rotating shaft body 20. In this way, the nut 28 prevents the attachment 51 from moving beyond the nut 28 in the first direction DR1. The nut 28 has an internal thread 28p that engages with the external thread 20p of the rotating shaft body 20.

[0048] exist Figure 7 In the described example, the nut 28 has a threaded hole 28h into which a threaded component 55a is inserted. By rotating the threaded component 55a relative to the threaded hole 28h, the threaded component 55a moves in the second direction DR2. By moving the threaded component 55a in the second direction DR2, the threaded component 55a presses the attachment 51 in the second direction DR2 via the collar 55b. The attachment 51 is pressed in the second direction DR2 and moves in the second direction DR2, thereby displacing the outer surface 51t of the attachment 51 in a direction away from the first axis AX.

[0049] exist Figure 12 In the described example, the nut 28 has six threaded holes 28h, in which six threaded components 55a can be respectively disposed. Furthermore, the number of threaded holes 28h in the nut 28 is not limited to six, but is arbitrary. Figure 12In the example described, multiple threaded holes 28h are arranged at equal angular intervals around the central axis of nut 28.

[0050] (Rotation axis 2) exist Figure 13 In the example described, the rotary shaft 2 includes a rotary shaft body 20 and a chuck 25 for holding the workpiece W. The rotary shaft 2 may also include a chuck operating shaft 26, an operating shaft drive device 27, and / or a nut 28 (more specifically, a cap nut).

[0051] exist Figure 13 In the described example, the rotating shaft body 20 is a cylindrical component. The rotating shaft body 20 can be composed of a single component or an assembly of multiple components. Figure 13 In the example described, a chuck 25 and a chuck operating shaft 26 are arranged inside the rotating shaft body 20, and an accessory 51 is arranged outside the rotating shaft body 20.

[0052] exist Figure 13 In the example described, the chuck 25 has an inner surface 25n that holds the workpiece W and an inclined surface (hereinafter referred to as "third inclined surface AS3") that is pressed by the chuck operating shaft 26.

[0053] The nut 28 has an internal thread 28p that engages with the external thread 20p of the rotating shaft body 20. Figure 13 In the described example, nut 28 prevents collet 25 from detaching from the rotating shaft body 20. Additionally, nut 28 prevents accessory 51 and / or collar 55b from detaching from the rotating shaft body 20. In other words, by installing nut 28 onto the rotating shaft body 20, both detachment of collet 25 and accessory 51 from the rotating shaft body 20 can be prevented.

[0054] The chuck operating shaft 26 has an inclined surface (hereinafter referred to as "fourth inclined surface AS4") capable of pressing the third inclined surface AS3 of the chuck 25. Figure 13 In the described example, if the chuck operating axis 26 moves relative to the chuck 25 in the first direction DR1, the fourth inclined surface AS4 of the chuck operating axis 26 presses against the third inclined surface AS3 of the chuck 25. As a result, the inner surface 25n of the chuck 25 displaces in the direction toward the first axis AX, and the workpiece W is held by the inner surface 25n of the chuck 25. Furthermore, while the chuck 25 holds the workpiece W, if the second support device 6 moves the rotation axis 2 in the first direction DR1, the workpiece W moves together with the rotation axis 2 in the first direction DR1. Thus, by moving the rotation axis 2 in a direction parallel to the first axis AX, the second support device 6 can change the machining position of the workpiece W machined by the tool T. The front end portion of the workpiece W, after the prescribed machining has been performed, can also be separated from the remaining portion of the workpiece W by cutting.

[0055] exist Figure 13 In the described example, if the chuck operating axis 26 moves relative to the chuck 25 in the second direction DR2, the inner surface 25n of the chuck 25 displaces in a direction away from the first axis AX, and the chuck 25 releases its hold on the workpiece W. With the chuck 25 releasing its hold on the workpiece W, the workpiece W is moved relative to the chuck 25 in the first direction DR1 by a workpiece feeding device such as a bar feeder (not shown). As a result, the amount of protrusion of the workpiece W from the front end 25e of the chuck 25 increases (in other words, the workpiece W is ejected from the front end 25e of the chuck 25).

[0056] The operating axis drive device 27 moves the chuck operating axis 26 in the first direction DR1. The operating axis drive device 27 may include a hydraulic cylinder, a pneumatic cylinder, or a motor. Additionally, the operating axis drive device 27 may also be able to move the chuck operating axis 26 in the second direction DR2. Alternatively, if the rotating axis 2 is equipped with a force-applying member 29 (e.g., a spring) that applies force to the chuck operating axis 26 in the second direction DR2, the force generated by the force-applying member 29 may also be used to move the chuck operating axis 26 in the second direction DR2.

[0057] (The front end 22 of the rotating shaft 2 moves towards the inside of the through hole 3h) exist Figure 4 as well as Figure 5 In the described example, when the accessory 51 is installed on the front end 22 of the rotating shaft 2, the front end 22 of the rotating shaft 2 can be extended from the outside of the through hole 3h (see reference). Figure 4 ) Towards the inner side of the through hole 3h (refer to Figure 5 )move.

[0058] More specifically, the second support device 6 moves the rotation shaft 2 in the first direction DR1, thereby changing the position of the front end portion 22 on which the accessory 51 is mounted from a first position located on the second direction DR2 side of the through hole portion 3h of the first support device 3 closer to the second direction DR2 to a second position located on the second direction DR2 side of the through hole portion 3h closer to the first direction DR1.

[0059] When the front end portion 22 of the rotating shaft 2 can be moved inward toward the through hole portion 3h with the attachment 51 installed on it, it is not necessary to install the attachment 51 on the front end portion 22 of the rotating shaft 2 after the front end portion 22 has moved inward toward the through hole portion 3h. Therefore, the workload when switching from machining long workpieces to machining short workpieces can be reduced, and the switch from machining long workpieces to machining short workpieces can be performed quickly.

[0060] In addition, Figure 3In the described example, with the attachment 51 installed at the front end 22 of the rotating shaft 2, the first workpiece W1 (in other words, the long workpiece) can be supported by both the front end 22 of the rotating shaft 2 and the guide sleeve 91. In this case, it is not necessary to remove the attachment 51 from the rotating shaft 2 during the machining of the long workpiece. Therefore, the possibility of losing the attachment 51 can be reduced. In addition, since it is not necessary to remove the attachment 51 from the rotating shaft 2, the workload when switching from machining a short workpiece to machining a long workpiece can be reduced, and the switch from machining a short workpiece to machining a long workpiece can be performed quickly.

[0061] exist Figure 4 as well as Figure 5 In the example described, the position at the front end 22 of the rotating shaft 2 is the first position (see reference). Figure 4 ) and the second position (refer to) Figure 5 At any position of the rotating shaft 2, the attachment 51 is installed at the front end 22 of the rotating shaft 2. Alternatively, the attachment 51 can be removed from the front end 22 of the rotating shaft 2 when processing long workpieces, and installed at the front end 22 of the rotating shaft 2 when processing short workpieces.

[0062] exist Figure 6 as well as Figure 7 In the described example, after the front end portion 22 of the rotating shaft 2 is inserted into the through hole 3h, the outer surface 51t of the accessory 51 is displaced in a direction away from the first axis AX. In this case, when the front end portion 22 of the rotating shaft 2 is inserted into the through hole 3h, it is possible to prevent or suppress the end portion 3e of the accessory 51 on the second direction DR2 side of the through hole 3h from being displaced (see reference). Figure 4 It's stuck. Also, as... Figure 4 As illustrated, the end portion of the through hole 3h on the second direction DR2 side may also have a tapered inner surface 321n that increases in distance from the first axis AX as it moves toward the second direction DR2. In this case, when the front end portion 22 is inserted into the through hole 3h, it is possible to more effectively prevent or suppress the attachment 51 from being stuck by the end portion 3e on the second direction DR2 side of the through hole 3h.

[0063] (Sliding movement of the front end portion 22 of the rotating shaft 2 relative to the through hole portion 3h) exist Figure 7 In the described example, with the attachment 51 installed on the front end 22 of the rotating shaft 2 (more specifically, with the first distance L1 between the outermost 511t of the attachment 51 and the first shaft AX being greater than the second distance L2 between the outermost surface 222t of the front end 22 of the rotating shaft 2 and the first shaft AX), the front end 22 of the rotating shaft 2 is allowed to slide relative to the through hole 3h of the first support device 3.

[0064] In this case, with the displacement of the front end 22 of the rotating shaft 2 in the direction perpendicular to the first axis AX reduced by Annex 51, the second support device 6 enables the rotating shaft 2 to move relative to the first support device 3 in a direction parallel to the first axis AX (see reference). Figure 14 (Arrow AR2 in the diagram). Therefore, it is possible to perform machining of the second workpiece W2 by tool T while suppressing the deflection of the second workpiece W2, and to change the machining position of the second workpiece W2 by moving it in a direction parallel to the first axis AX.

[0065] (Second support device 6) exist Figure 14 In the example described, the workpiece support device 1A for the machine tool includes: a second support device 6 supporting the rotating shaft 2; a spindle motor 7 that rotates the rotating shaft 2 about the first axis AX; and a first bearing assembly 41.

[0066] The second support device 6 includes a shaft support component 60. The shaft support component 60 supports the rotating shaft 2 via a first bearing assembly 41 so that it can rotate about a first axis AX. The shaft support component 60 is composed of multiple components.

[0067] Furthermore, the second support device 6 includes a first drive device 66. The first drive device 66 moves the shaft support member 60 in a direction parallel to the first shaft AX. By moving the shaft support member 60 in a direction parallel to the first shaft AX, the first drive device 66 moves the rotating shaft 2 supported by the shaft support member 60 in the same direction.

[0068] exist Figure 14 In the described example, the first drive device 66 enables the rotating shaft 2, the shaft support member 60, and the main shaft motor 7 to move relative to the first support device 3 in a direction parallel to the first shaft AX.

[0069] exist Figure 14 In the described example, the first drive unit 66 includes a first motor 661 (e.g., a servo motor) and a lead screw 663 driven by the first motor 661. A shaft support member 60 is screwed onto the lead screw 663 via rolling elements such as balls or rollers (more specifically, a block 60b forming part of the shaft support member 60 is screwed onto the lead screw 663 via rolling elements). In this case, if the first motor 661 rotates the lead screw 663, the shaft support member 60 screwed onto the lead screw 663 moves in a direction parallel to the first axis AX. If the shaft support member 60 moves in a direction parallel to the first axis AX, the rotating shaft 2 supported by the shaft support member 60 also moves in a direction parallel to the first axis AX.

[0070] The first drive device 66 is not limited to a drive device consisting of a first motor 661 and a lead screw 663. As the first drive device 66, any drive device can be used as long as it can move the rotation axis 2 in a direction parallel to the first axis AX. The first drive device 66 may also include a first motor 661, a rack, and a pinion. Alternatively, the first drive device 66 may also include a linear motor.

[0071] The spindle motor 7 causes the rotating shaft 2 to rotate about the first axis AX relative to the shaft support member 60. Figure 14 In the described example, the spindle motor 7 has a stator 71 disposed on the shaft support member 60 and a rotor 72 disposed on the rotating shaft 2. The spindle motor 7 is a device that rotates the rotating shaft 2 by electromagnetic action. Alternatively, the spindle motor 7 may also be a device that rotates the rotating shaft 2 by using a drive belt or the like.

[0072] The first bearing assembly 41 is positioned between the shaft support component 60 and the rotating shaft 2. Figure 14 In the described example, the first bearing assembly 41 includes: a first bearing 41a, disposed between the shaft support member 60 and the rear end portion 21 of the rotating shaft 2; and a second bearing 41b, disposed between the shaft support member 60 and the central portion 23 of the rotating shaft 2. Figure 14 In the described example, the front end portion 22 of the rotating shaft 2 protrudes towards the first direction DR1 from the shaft support member 60. Therefore, no bearing is disposed on the outer surface of the front end portion 22.

[0073] (First support device 3) exist Figure 14 In the example described, the first support device 3 includes a rotating body 31, a rotating body support component 33, and a second bearing assembly 35.

[0074] The rotating body 31 is capable of rotating about the second axis AX2. The second axis AX2, which serves as the rotation axis of the rotating body 31, is substantially coaxial with the first axis AX, which serves as the rotation axis of the rotating shaft 2. The rotating body 31 has the aforementioned through hole 3h, and the guide sleeve adapter 92 can be installed in the through hole 3h.

[0075] The rotating body support member 33 supports the rotating body 31 via the second bearing assembly 35, enabling it to rotate about the second axis AX2. The rotating body support member 33 is composed of multiple components. The second bearing assembly 35 is disposed between the rotating body support member 33 and the rotating body 31.

[0076] (Rotary drive device 38) exist Figure 14 In the described example, the workpiece support device 1A for a machine tool includes a rotary drive device 38, which causes the rotating body 31 to rotate relative to the rotating body support member 33 about a second axis AX2. Figure 14 In the described example, the rotary drive device 38 includes: a second motor 381 (e.g., a servo motor); and a drive belt 383 that transmits the rotation of the output shaft of the second motor 381 to the rotating body 31.

[0077] The rotary drive device 38 is not limited to a drive device consisting of a second motor 381 and a transmission belt 383. As the rotary drive device 38, any drive device can be used as long as it can rotate the rotating body 31 around the second axis AX2. The rotary drive device 38 can be an electromagnetic drive device having a stator and a rotor. Alternatively, the rotary drive device 38 can be a device that uses the power of the main spindle motor 7 to drive the rotating body 31. In other words, the rotary drive device 38 can include a main spindle motor 7 and a transmission mechanism (e.g., a transmission belt, gears, etc.) that connects the main spindle motor 7 and the rotating body 31 to transmit power.

[0078] exist Figure 14 In the described example, it is preferable that the angular velocity of the rotating body 31, which rotates via the rotary drive 38, is substantially equal to the angular velocity of the rotating shaft 2, which rotates via the spindle motor 7. In other words, it is preferable that the rotating body 31 and the rotating shaft 2 are driven synchronously with substantially equal angular velocities. When the angular velocity of the rotating body 31 is equal to the angular velocity of the rotating shaft 2, wear on the outer surface of the accessory 51 and wear on the inner surface of the through hole 3h can be prevented or suppressed.

[0079] (Air supply device 8) exist Figure 15 In the described example, the workpiece support device 1A for a machine tool includes an air supply device 8 that supplies air to the first support device 3. Furthermore, in Figure 16 In the described example, an injection port 325 for injecting air supplied from the air supply device 8 is formed on the inner surface 32n (more specifically, the inner circumferential surface) of the through hole 3h of the first support device 3. The injection port 325 can be formed by a groove (e.g., an annular groove formed on the inner surface 32n of the through hole 3h) or by one or more injection holes. Figure 16 In the described example, the nozzle 325 ejects air in a direction toward the first axis AX (more specifically, toward the outer surface of the front end portion 22 of the rotating shaft 2). The nozzle 325 can eject air in such a manner that the air has a motion component in the direction toward the first axis AX and a motion component in the first direction DR1.

[0080] exist Figure 16In the described example, air ejected from the injection port 325 is discharged in the first direction DR1 through the gap G4 between the inner surface 32n of the through hole 3h and the outer surface of the front end portion 22 of the rotating shaft 2. The first air curtain J1 formed by the air discharged from this gap G4 in the first direction DR1 prevents or suppresses foreign matter such as chips and coolant from entering the gap G4 between the inner surface 32n of the through hole 3h and the outer surface of the front end portion 22 of the rotating shaft 2. Furthermore, by suppressing the entry of foreign matter, accidental vibration of the rotating shaft 2 can be suppressed, and a decrease in machining accuracy can be prevented. Additionally, damage or injury to the rotating shaft 2 caused by the entry of foreign matter can be prevented or suppressed.

[0081] exist Figure 16 In the example described, the first support device 3 includes a rotating body 31, a rotating body support component 33, and an airflow channel 324.

[0082] The rotating body 31 has the aforementioned through hole 3h capable of supporting the guide sleeve adapter 92. The rotating body support member 33 supports the rotating body 31 so that it can rotate about the second axis AX2. In addition, the air flow channel 324 is fluidly connected to the air supply device 8 (see reference). Figure 15 ) and nozzle 325.

[0083] exist Figure 16 In the described example, the airflow channel 324 is configured to traverse the gap G5 between the rotating body 31 and the rotating body support member 33. In this case, a portion of the air flowing through the airflow channel 324 is discharged in the first direction DR1 through the gap G5 between the rotating body 31 and the rotating body support member 33. The second air curtain J2 formed by the air discharged from this gap G5 in the first direction DR1 prevents or inhibits foreign matter such as chips and coolant from entering the gap G5 between the rotating body 31 and the rotating body support member 33. Furthermore, by inhibiting the entry of foreign matter into this gap G5, damage or injury to the second bearing assembly 35 can be prevented or suppressed.

[0084] exist Figure 16 In the described example, with the front end portion 22 of the rotating shaft 2 positioned inside the through hole 3h, air discharged from the gap G4 between the inner surface 32n of the through hole 3h and the outer surface of the front end portion 22 of the rotating shaft 2 forms a first air curtain J1, and air discharged from the gap G5 between the rotating body 31 and the rotating body support member 33 forms a second air curtain J2. Furthermore, the second air curtain J2 is formed to surround the first air curtain J1. Figure 16In the described example, a portion 324a of the airflow channel 324 through which the air passes to form the first air curtain J1 and a portion 324a of the airflow channel 324 through which the air passes to form the second air curtain J2 are combined. In this case, the configuration of the airflow channel 324 can be simplified. However, the airflow channel through which the air passes to form the first air curtain J1 and the airflow channel through which the air passes to form the second air curtain J2 can also be completely separated. Alternatively, the formation of the second air curtain J2 itself can be omitted.

[0085] exist Figure 17 In the example described, a guide sleeve adapter 92 is installed at the through hole portion 3h. Additionally, in... Figure 18 In the described example, when the guide sleeve adapter 92 is installed in the through hole section 3h, the injection port 325 is closed by the guide sleeve adapter 92. Figure 17 In the described example, the front end portion 22 of the rotating shaft 2 is positioned further in the second direction DR2 than the guide sleeve 91, making it less likely that foreign matter such as chips or coolant will adhere to the front end portion 22 of the rotating shaft 2. Therefore, in Figure 17 In the examples described, the formation of a first air curtain J1 is not required.

[0086] exist Figure 18 In the described example, the airflow channel 324 is configured to traverse the gap G5 between the rotating body 31 and the rotating body support member 33. In this case, at least a portion of the air flowing through the airflow channel 324 is discharged in the first direction DR1 through the gap G5 between the rotating body 31 and the rotating body support member 33. Furthermore, the air discharged from the gap G5 between the rotating body 31 and the rotating body support member 33 forms a second air curtain J2.

[0087] (Second Implementation) Reference Figures 19 to 24 The workpiece support device 1B for machine tools and the machine tool 100B according to the second embodiment will be described. Figure 19 This is a schematic cross-sectional view of the machine tool 100B according to the second embodiment. Figure 20 This is a schematic cross-sectional view showing a portion of the machine tool 100B according to the second embodiment. Figure 21 This is a schematic cross-sectional view of the machine tool 100B according to the second embodiment. Figure 22 This is a schematic cross-sectional view showing a portion of the machine tool 100B according to the second embodiment. Figure 23 Is Figure 22 An enlarged view of the region H enclosed by a square with a single-dot dashed line. Figure 24 Is Figure 20 An enlarged view of the region F enclosed by a square with a single-dot dashed line.

[0088] The workpiece support device 1B and machine tool 100B of the second embodiment differ from the workpiece support device 1A and machine tool 100A of the first embodiment in that the spindle motor 7 that causes the rotating shaft 2 to rotate around the first axis AX is provided on the first support device 3.

[0089] In the second embodiment, the description focuses on the points that differ from the first embodiment. Furthermore, in the second embodiment, repetitive explanations of matters described in the first embodiment are omitted. Therefore, even though not explicitly described, matters described in the first embodiment can certainly be applied to the second embodiment.

[0090] like Figure 19 As illustrated in the example, the workpiece support device 1B for a machine tool in the second embodiment includes a rotating shaft 2, a first support device 3, a second support device 6, and an accessory 51.

[0091] Rotating shaft 2 supports workpiece W and is capable of rotating about a first axis AX. Rotating shaft 2 has a rear end 21 and a front end 22. Figure 20 In the described example, a chuck 25 is provided at the front end 22 of the rotating shaft 2. In this case, the rotating shaft 2 supports the workpiece W via the chuck 25.

[0092] The first support device 3 has a through hole 3h capable of supporting the guide sleeve unit 9, and more specifically, a through hole 3h capable of supporting and holding the guide sleeve 91 and the guide sleeve adapter 92. The guide sleeve adapter 92 can be installed in the through hole 3h. Figure 20 The diagram shows the state in which the guide sleeve adapter 92 is installed in the through hole 3h of the first support device 3. Figure 21 The image shows the state in which the guide sleeve adapter 92 has been removed from the through hole 3h of the first support device 3.

[0093] exist Figure 21 In the described example, the guide sleeve unit 9 is composed of multiple components. More specifically, the guide sleeve unit 9 includes a guide sleeve 91 and a guide sleeve adapter 92 for holding the guide sleeve 91. The guide sleeve 91 has a hollow hole 91h for inserting the workpiece W. The guide sleeve 91 is held by the guide sleeve adapter 92. In addition, the guide sleeve adapter 92 is mounted on the first support device 3.

[0094] exist Figure 19 In the described example, the first part Wa of the workpiece W (more specifically, the front end of the workpiece W) is supported by the guide sleeve 91 in a manner that allows it to move relative to the guide sleeve 91 in the first direction DR1. Furthermore, the second part Wb of the workpiece W (more specifically, the central portion of the workpiece W along its long side or the base end of the workpiece W) is held by the rotation shaft 2.

[0095] like Figure 19 As illustrated, the second support device 6 supports the rotating shaft 2 (more specifically, a portion of the rotating shaft 2). Furthermore, the second support device 6 allows the rotating shaft 2 to move relative to the first support device 3 in a direction parallel to the first axis AX. If the rotating shaft 2 moves relative to the first support device 3 in a direction parallel to the first axis AX, the workpiece W held by the rotating shaft 2 moves in the same direction (refer to arrow AR1). Thus, by moving the rotating shaft 2 in a direction parallel to the first axis AX, the second support device 6 can change the machining position of the workpiece W being machined by the tool T.

[0096] exist Figure 21 In the described example, the through hole 3h, which constitutes the first support device 3, can accommodate the front end portion 22 of the rotating shaft 2. Furthermore, in a first state where a guide sleeve 91 can be disposed in the first region RG1 inside the through hole 3h (see reference...),... Figure 20 ) and the second state (refer to) where the front end 22 of the rotating shaft 2 is arranged in the first region RG1. Figure 22 The internal state of the through hole 3h can be switched between the two states. After removing the guide sleeve adapter 92 from the through hole 3h, the rotating shaft 2 is moved in the first direction DR1, thereby enabling the switching of the internal state of the through hole 3h from the first state to the second state.

[0097] exist Figure 21 In the example described, the second support device 6 can change the position of the front end 22 of the rotating shaft 2 from a position closer to the second direction DR2 than the first region RG1 to a position within the first region RG1 occupied by the guide sleeve unit 9 by moving the rotating shaft 2 in the first direction DR1.

[0098] like Figure 22 As illustrated, when the front end 22 of the rotating shaft 2 is located in the first region RG1, the short workpiece (in other words, the second workpiece W2) held by the front end 22 of the rotating shaft 2 can be machined by the tool T.

[0099] The workpiece support device 1B for a machine tool according to the second embodiment includes an accessory 51 that contacts the outer surface 22t of the front end portion 22 of the rotating shaft 2. Figure 23 In the example described, Attachment 51 is installed at the front end 22 of the rotating shaft 2.

[0100] At least a portion of the outer surface 51t of attachment 51 is capable of displacement in a direction away from the first axis AX. This displacement of at least a portion of the outer surface 51t of attachment 51 in a direction away from the first axis AX reduces the gap G2 between the outer surface 51t of attachment 51 and the inner surface 32n of the through hole 3h. Thus, attachment 51 can reduce the amount of displacement of the front end portion 22 of the rotating shaft 2 in a direction perpendicular to the first axis AX.

[0101] More specifically, at least a portion of attachment 51 is capable of displacement in a direction away from the first axis AX, so that the outermost portion 511t of attachment 51 (in) Figure 23 In the example described, the first distance L1 between the outermost surface 511t of attachment 51 (the outer surface 51t of attachment 51) and the first axis AX is greater than the second distance L2 between the outermost surface 222t of the front end 22 of the rotating shaft 2 and the first axis AX.

[0102] exist Figure 23 In the described example, by making the first distance L1 greater than the second distance L2, the attachment 51 can prevent the outermost surface 222t of the front end portion 22 of the rotating shaft 2 from directly contacting the inner surface 32n of the through hole portion 3h. In other words, when the rotating shaft 2 flexes, the outermost surface 511t of the attachment 51 contacts the inner surface 32n of the through hole portion 3h before the outermost surface 222t of the front end portion 22 of the rotating shaft 2 contacts the inner surface 32n of the through hole portion 3h. In this way, the amount of displacement of the front end portion 22 in the direction perpendicular to the first axis AX can be reduced.

[0103] The workpiece support device 1B for machine tools according to the second embodiment can achieve the same effect as the workpiece support device 1A for machine tools according to the first embodiment.

[0104] exist Figure 20 In the described example, a guide sleeve 91 is disposed in the first region RG1 inside the through hole portion 3h, and the front end portion 22 of the rotating shaft 2 is disposed in the second region RG2 inside the through hole portion 3h. The second region RG2 is the region located on the second direction DR2 side compared to the first region RG1. Figure 20 In the described example, the first workpiece W1 can be supported by the guide sleeve 91 disposed in the first region RG1 inside the through hole 3h of the first support device 3 and the front end portion 22 of the rotating shaft 2 disposed in the second region RG2 inside the through hole 3h. By distributing both the front end portion 22 of the rotating shaft 2 and the guide sleeve 91 in a through hole 3h, the first workpiece W1 is less likely to deflect. However, in the second embodiment, it is not excluded that the front end portion 22 of the rotating shaft 2 is disposed outside the through hole 3h (more specifically, disposed on the side further in the second direction DR2 than the through hole 3h).

[0105] like Figure 19 As illustrated in the illustration, the machine tool 100B of the second embodiment, in addition to the workpiece support device 1B for the machine tool, also includes a tool holding device 110 for holding the tool T and a second drive device 120 for moving the tool holding device 110. The second drive device 120 is capable of moving the tool holding device 110 in a direction close to (or away from) the first axis AX.

[0106] (arbitrarily added components) Next, refer to Figures 19 to 24 The following describes any additional configurations that can be used in the workpiece support device 1B for the machine tool and the machine tool 100B in the second embodiment.

[0107] (Second support device 6) exist Figure 19 In the described example, the second support device 6 includes a shaft support component 60 and a first drive device 66. Additionally, the workpiece support device 1B for the machine tool includes a first bearing assembly 41.

[0108] The shaft support component 60 supports the rotating shaft 2 via the first bearing assembly 41 so that it can rotate about the first axis AX. The shaft support component 60 is composed of multiple components.

[0109] The first drive unit 66 moves the shaft support member 60 in a direction parallel to the first shaft AX. By moving the shaft support member 60 in a direction parallel to the first shaft AX, the first drive unit 66 moves the rotating shaft 2 supported by the shaft support member 60 in the same direction.

[0110] exist Figure 19 In the described example, the first drive device 66 enables the rotating shaft 2 and the shaft support member 60 to move relative to the first support device 3 and the main shaft motor 7 in a direction parallel to the first shaft AX.

[0111] exist Figure 19 In the described example, the first drive device 66 includes a first motor 661 (e.g., a servo motor) and a lead screw 663 driven by the first motor 661. Additionally, the shaft support member 60 is screwed to the lead screw 663 via rolling elements such as balls or rollers. Furthermore, the first drive device 66 is not limited to a drive device consisting of the first motor 661 and the lead screw 663. Any drive device can be used as the first drive device 66, as long as it enables the rotation axis 2 to move in a direction parallel to the first axis AX.

[0112] The first bearing assembly 41 is positioned between the shaft support component 60 and the rotating shaft 2. Figure 19In the described example, the first bearing assembly 41 includes a first bearing 41a disposed between the shaft support member 60 and the rear end portion 21 of the rotating shaft 2. Figure 19 In the example described, the central portion 23 and the front end portion 22 of the rotating shaft 2 protrude toward the first direction DR1 side from the shaft support member 60.

[0113] (First support device 3) exist Figure 19 In the described example, the first support device 3 includes a rotating body 31, a rotating body support component 33, and a second bearing assembly 35. Furthermore, in... Figure 19 In the example described, the first support device 3 includes a spindle motor 7 and a locking component 36.

[0114] The rotating body 31 is capable of rotating about a second axis AX2 that is substantially coaxial with the first axis AX. In other words, the rotation axis of the rotating body 31 is substantially coaxial with the rotation axis of the rotating axis 2. The rotating body 31 has the aforementioned through hole 3h, allowing the guide sleeve adapter 92 to be installed into the through hole 3h.

[0115] The rotating body support member 33 supports the rotating body 31 via the second bearing assembly 35, enabling it to rotate about the second axis AX2. The rotating body support member 33 is composed of multiple components. The second bearing assembly 35 is disposed between the rotating body support member 33 and the rotating body 31.

[0116] The main spindle motor 7 causes the rotating shaft 2 to rotate relative to the shaft support component 60 about the first axis AX. Figure 19 In the described example, the spindle motor 7 has a stator 71 disposed on the rotating body support member 33 and a rotor 72 disposed on the rotating body 31. In this case, the rotating body 31 is driven to rotate by the electromagnetic action of the spindle motor 7. Alternatively, the spindle motor 7 may also drive the rotating body 31 to rotate via a power transmission member such as a drive belt.

[0117] exist Figure 24 In the described example, the engaging member 36 is disposed on the rotating body 31, and the engaging member 36 transmits the rotation of the rotating body 31 to the rotating shaft 2. Figure 24 In the described example, the engagement between the engaging member 36 and the engaging portion 24 of the rotating shaft 2 is an engagement that allows the rotating shaft 2 to move relative to the rotating body 31 in a direction parallel to the first axis AX while preventing the rotating shaft 2 from rotating relative to the rotating body 31 about the first axis AX. Figure 24As illustrated, one of the engaging portion 24 and the engaging member 36 may have at least one groove M1 extending in a direction parallel to the first axis AX or at least one elongated hole extending in a direction parallel to the first axis AX, and the other of the engaging portion 24 and the engaging member 36 may have at least one protrusion M2 engaging with the at least one groove M1 or the at least one elongated hole.

[0118] (Rotary drive device 38) exist Figure 19 In the described example, the workpiece support device 1B for the machine tool includes a rotary drive device 38, which rotates the rotating body 31 relative to the rotating body support member 33 about a second axis AX2 that is substantially coaxial with the first axis AX. Figure 19 In the described example, the rotary drive device 38 that rotates the rotating body 31 relative to the rotating body support member 33 about the second axis AX2 is composed of the aforementioned spindle motor 7. In other words, the aforementioned spindle motor 7 functions as the rotary drive device 38 that rotates the rotating body 31 about the second axis AX2.

[0119] By making the spindle motor 7 and the rotary drive device 38 common, the mechanism for rotating the rotating shaft 2 and the rotating body 31 can be made more compact. In addition, when the spindle motor 7 that rotates the rotating shaft 2 and the rotary drive device 38 that rotates the rotating body 31 are common, rotational synchronization between the rotating shaft 2 and the rotating body 31 can be easily achieved.

[0120] (Attachment 51) exist Figure 23 In the described example, attachment 51 is disposed between the outer surface 22t of the rotating shaft 2 and the inner surface 32n of the through hole portion 3h. Attachment 51 has an inner surface 51n that contacts the outer surface 22t of the rotating shaft 2, and an outer surface 51t that opposes the inner surface 32n of the through hole portion 3h.

[0121] exist Figure 23 In the described example, at least one of the attachment 51 and the rotation shaft 2 has an inclined surface AS that converts the relative movement of the attachment 51 with respect to the rotation shaft 2 in a direction parallel to the first axis AX into displacement of at least a portion of the attachment 51 (e.g., the outer surface 51t of the attachment 51) in a direction away from the first axis AX. More specifically, the inner surface 51n of the attachment 51 has a first inclined surface AS1 that increases in distance from the first axis AX as it moves toward the second direction DR2, and the outer surface 22t of the rotation shaft 2 has a second inclined surface AS2 that increases in distance from the first axis AX as it moves toward the second direction DR2. In this case, by moving the attachment 51 relative to the rotation shaft 2 in the second direction DR2, the outer surface 51t of the attachment 51 is displaced in a direction away from the first axis AX.

[0122] exist Figure 23 In the described example, at least a portion of the attachment 51 is capable of increasing its diameter in a direction away from the first axis AX. More specifically, at least a portion of the attachment 51 disposed at the front end portion 22 of the rotating shaft 2 is capable of increasing its diameter in a direction away from the first axis AX, such that the first distance L1 between the outermost 511t of the attachment 51 and the first axis AX is greater than the second distance L2 between the outermost surface 222t of the front end portion 22 of the rotating shaft 2 and the first axis AX.

[0123] Annex 51 includes, for example, a ring component. Annex 51 may be a C-shaped ring component (see, if needed). Figure 8 as well as Figure 9 It can also be a circular ring component (see reference if needed). Figure 10 as well as Figure 11 It can also be a ring component composed of multiple ring segments.

[0124] (Pressing component 55) exist Figure 23 In the described example, the workpiece support device 1B for the machine tool includes a pressing member 55 that presses the attachment 51 in the second direction DR2. By pressing the attachment 51 in the second direction DR2, the pressing member 55 can move the attachment 51 relative to the rotation axis 2 in a direction parallel to the first axis AX (more specifically, the second direction DR2). Furthermore, as the attachment 51 is pressed in the second direction DR2 by the pressing member 55, its outer surface 51t is displaced toward the inner surface 32n of the through hole 3h. This reduces the gap G2 between the outer surface 51t of the attachment 51 and the inner surface 32n of the through hole 3h.

[0125] exist Figure 23 In the described example, the pressing member 55 has a first threaded portion (more specifically, an internal threaded portion 28p) that converts the rotational force acting on the pressing member 55 into the pressing force of the pressing attachment 51. In other words, the pressing member 55 includes a threaded member 55a capable of converting the rotational force acting on the pressing member 55 into the pressing force of the pressing attachment 51.

[0126] exist Figure 23 In the described example, the first threaded portion (more specifically, the internal threaded portion 28p) engages with the second threaded portion (more specifically, the external threaded portion 20p) of the rotating shaft body 20. Figure 23 In the described example, the threaded component 55a is a nut 28 (more specifically, a cap nut) that engages with the front end of the rotating shaft body 20. Alternatively, the threaded component 55a could also be... Figure 7 The example shows a bolt like that.

[0127] exist Figure 23 In the described example, by rotating the internal thread portion 28p of the pressing member 55 relative to the external thread portion 20p of the rotating shaft body 20, the pressing member 55 presses the attachment 51 (more specifically, the ring member) in the second direction DR2. As a result, the attachment 51 moves in the second direction DR2, and the outer surface 51t of the attachment 51 is displaced in the direction toward the inner surface 32n of the through hole portion 3h.

[0128] (Rotation axis 2) exist Figure 23 In the example described, the rotary shaft 2 includes a rotary shaft body 20 and a chuck 25 for holding the workpiece W. The rotary shaft 2 may also include a chuck operating shaft 26 and an operating shaft drive device 27 (see reference). Figure 19 ), Nut 28 (more specifically, cap nut).

[0129] The rotating shaft body 20, the chuck 25, the chuck operating shaft 26, the operating shaft drive device 27, and the nut 28 have already been described in the first embodiment. Therefore, repeated descriptions of these components will be omitted.

[0130] (Third Implementation) Reference Figures 25 to 30 The workpiece support device 1C for machine tools and the machine tool 100C according to the third embodiment will be described. Figure 25 as well as Figure 26 This is a schematic cross-sectional view of the machine tool 100C according to the third embodiment. Figure 27 Is Figure 26 An enlarged view of the region N enclosed by a square with a single-dot dashed line. Figure 28 Is Figure 26 An enlarged view of region N, enclosed by a square with a single-dot dashed line. Additionally, Figure 28 express Figure 27 Appendix 51 shows the state after displacement in a direction close to the first axis AX. Figure 29 This is a schematic cross-sectional view of the machine tool 100C according to the third embodiment. Figure 30 This is a schematic cross-sectional view of a portion of a machine tool 100C, representing a first variation of the third embodiment.

[0131] The third embodiment differs from the first and second embodiments in that the inner surface 32n of the through hole 3h of the first support device 3 is contacted by the attachment 51.

[0132] In the third embodiment, the description focuses on the differences from the first and second embodiments. Furthermore, in the third embodiment, repetitive descriptions of matters already described in the first or second embodiments are omitted. Therefore, in the third embodiment, even if not explicitly described, matters described in the first or second embodiments can naturally be applied.

[0133] like Figure 25 As illustrated in the example, the workpiece support device 1C for a machine tool in the third embodiment includes a rotating shaft 2, a first support device 3, a second support device 6, and an accessory 51.

[0134] Rotating shaft 2 supports workpiece W and is capable of rotating about a first axis AX. Rotating shaft 2 has a rear end 21 and a front end 22. Figure 25 In the described example, the first part Wa of the workpiece W is supported by the guide sleeve 91 in a manner that allows it to move relative to the guide sleeve 91 in the first direction DR1. Furthermore, the second part Wb of the workpiece W is held by the rotation shaft 2. Therefore, in Figure 25 In the example described, the long workpiece (in other words, the first workpiece W1) can be stably supported by the front end 22 of the rotating shaft 2 and the guide sleeve 91.

[0135] The first support device 3 has a through hole 3h capable of supporting and holding the guide sleeve 91 and the guide sleeve adapter 92. Figure 25 The diagram shows the state in which the guide sleeve adapter 92 is installed in the through hole 3h of the first support device 3. Figure 26 The text indicates that the guide sleeve adapter 92 has been removed from the through hole 3h of the first support device 3.

[0136] like Figure 26 As illustrated, with the guide sleeve adapter 92 removed from the through hole portion 3h, the front end portion 22 of the rotating shaft 2 can be accommodated in the through hole portion 3h. Therefore, in Figure 26 In the example described, the short workpiece (in other words, the second workpiece W2) can be supported by the front end 22 of the rotating shaft 2 inserted into the through hole 3h.

[0137] exist Figure 25 as well as Figure 26 In the described example, with the accessory 51 installed in the through hole 3h of the first support device 3, the front end 22 of the rotating shaft 2 can be extended from the outside of the through hole 3h (see reference). Figure 25 Move to the inner side of the through hole section 3h (refer to) Figure 2In this case, after the front end 22 moves to the inside of the through hole 3h, it is not necessary to install the accessory 51 into the through hole 3h. Therefore, the amount of work required to switch from machining long workpieces to machining short workpieces can be reduced, and the switch from machining long workpieces to machining short workpieces can be performed quickly.

[0138] The second support device 6 supports the rotating shaft 2. Furthermore, the second support device 6 allows the rotating shaft 2 to move relative to the first support device 3 in a direction parallel to the first axis AX.

[0139] exist Figure 26 In the described example, the second support device 6 includes: a shaft support member 60 that supports the rotating shaft 2 so that it can rotate about a first axis AX; and a first drive device 66 that moves the shaft support member 60 in a direction parallel to the first axis AX. Furthermore, the first drive device 66 moves the rotating shaft 2, the shaft support member 60, and the spindle motor 7 that rotates the rotating shaft 2 relative to the first support device 3 in a direction parallel to the first axis AX. Alternatively, as... Figure 30 As illustrated, the first drive device 66 can also move the rotating shaft 2 and the shaft support member 60 relative to the first support device 3 and the main spindle motor 7 that rotates the rotating shaft 2 in a direction parallel to the first shaft AX.

[0140] exist Figure 25 In the described example, attachment 51 contacts the inner surface 32n of the through hole 3h of the first support device 3. More specifically, attachment 51 is mounted on the inner surface 32n of the through hole 3h. Attachment 51 may be composed of a single component or multiple components (e.g., first component 51-1 and second component 51-2). Furthermore, in this specification, attachment 51 that contacts the inner surface 32n of the through hole 3h of the first support device 3 may also be referred to as the "second attachment".

[0141] At least a portion of the inner surface 51n of attachment 51 is displaceable in a direction approaching the first axis AX. By displacing at least a portion of the inner surface 51n of attachment 51 in a direction approaching the first axis AX, the gap G6 between the inner surface 51n of attachment 51 and the outer surface 22t of the front end portion 22 of the rotating shaft 2 can be reduced (see reference). Figure 28 Thus, attachment 51 can reduce the displacement of the front end 22 of the rotating shaft 2 in the direction perpendicular to the first axis AX.

[0142] More specifically, at least a portion of attachment 51 is displaceable in a direction approaching the first axis AX, so as to contact the innermost 511n of attachment 51 disposed on the inner surface 32n of the through hole portion 3h. Figure 28In the described example, the innermost 511n of attachment 51 (the inner surface 51n of attachment 51) and the first axis AX have a third distance L3 that is less than the fourth distance L4 between the innermost surface 322n of the through hole portion 3h and the first axis AX. Furthermore, the innermost 511n of attachment 51 refers to the portion of attachment 51 that is closest to the first axis AX. Similarly, the innermost surface 322n of the through hole portion 3h refers to the surface of the through hole portion 3h that is closest to the first axis AX.

[0143] exist Figure 28 In the described example, by making the third distance L3 smaller than the fourth distance L4, the attachment 51 can prevent the outer surface 22t of the front end portion 22 of the rotating shaft 2 from directly contacting the innermost surface 322n of the through hole portion 3h. In other words, when the rotating shaft 2 flexes, the innermost part 511n of the attachment 51 contacts the outer surface 22t of the front end portion 22 of the rotating shaft 2 before the outer surface 22t of the front end portion 22 of the rotating shaft 2 contacts the innermost surface 322n of the through hole portion 3h. In this way, the amount of displacement of the front end portion 22 in the direction perpendicular to the first axis AX can be reduced.

[0144] The workpiece support device 1C for machine tools according to the third embodiment can achieve the same effect as the workpiece support device 1A for machine tools according to the first embodiment or the workpiece support device 1B for machine tools according to the second embodiment.

[0145] like Figure 25 As illustrated in the example, the machine tool 100C of the third embodiment, in addition to the workpiece support device 1C for the machine tool, also includes a tool holding device 110 for holding the tool T and a second drive device 120 for moving the tool holding device 110. The second drive device 120 is capable of moving the tool holding device 110 in a direction close to the first axis AX (or in a direction away from the first axis AX).

[0146] (arbitrarily added components) Next, refer to Figures 25 to 30 Any additional configurations that can be used in the workpiece support device 1C and the machine tool 100C of the third embodiment will be described. In the third embodiment, the configurations other than the attachment 51 and the pressing member 55 are the same as those in the first or second embodiment. Therefore, the description here will focus on the attachment 51 and the pressing member 55, and repeated descriptions of other configurations will be omitted.

[0147] (Attachment 51) exist Figure 27In the described example, attachment 51 is disposed between the outer surface 22t of the front end portion 22 of the rotating shaft 2 and the inner surface 32n of the through hole portion 3h. Attachment 51 has an outer surface 51t that contacts the inner surface 32n of the through hole portion 3h, and an inner surface 51n that opposes the outer surface 22t of the front end portion 22 of the rotating shaft 2. Figure 27 In the example described, Attachment 51 is disposed in the recess 32d (more specifically, the annular recess) formed on the inner surface 32n of the through hole 3h.

[0148] like Figure 28 As illustrated, from the viewpoint of enabling the rotating shaft 2 to move smoothly relative to the through hole 3h in a direction parallel to the first axis AX, it is preferable to have a small gap G6 formed between the inner surface 51n of the attachment 51 and the outer surface 22t of the front end portion 22. However, the gap G6 between the inner surface 51n and the outer surface 22t of the front end portion 22 may also be zero if the contact between the inner surface 51n of the attachment 51 and the outer surface 22t of the front end portion 22 does not hinder the movement of the rotating shaft 2 in a direction parallel to the first axis AX. Furthermore, by arranging a rolling element such as a ball or roller, or an elastic body such as an O-ring, on one of the inner surface 51n of the attachment 51 and the outer surface 22t of the front end portion 22, it is possible to achieve a state in which a preload is applied to both the inner surface 51n and the outer surface 22t.

[0149] exist Figure 27 as well as Figure 28 In the described example, the state of the attachment 51 disposed in the through hole 3h can be changed from a third distance L3 between the innermost part 511n of the attachment 51 and the first axis AX to a third state greater than the fourth distance L4 between the innermost surface 322n of the through hole 3h and the first axis AX (see reference). Figure 27 The fourth state is changed so that the third distance L3 between the innermost 511n and the first axis AX of Annex 51 is less than the fourth distance L4 between the innermost surface 322n of the through hole and the first axis AX (refer to the fourth state). Figure 28 However, in the third embodiment, the aforementioned third state can be achieved (see...). Figure 27 It is not mandatory.

[0150] exist Figure 27In the described example, at least one of the attachment 51 and the through hole 3h has an inclined surface AS, which converts the relative movement of the attachment 51 (e.g., the second part 51-2 of the attachment 51) relative to the through hole 3h in a direction parallel to the first axis AX into the displacement of at least a portion of the attachment 51 (e.g., the first part 51-1 of the attachment 51) in a direction closer to the first axis AX. In this case, by moving the attachment 51 relative to the through hole 3h in a direction parallel to the first axis AX (more specifically, the second direction DR2), the gap G6 between the inner surface 51n of the attachment 51 and the outer surface 22t of the front end portion 22 of the rotating shaft 2 can be reduced. By reducing this gap G6, the amount of displacement of the front end portion 22 of the rotating shaft 2 in a direction perpendicular to the first axis AX can be reduced.

[0151] exist Figure 27 In the described example, Annex 51 has a first component 51-1 and a second component 51-2. In a cross-section including the first axis AX, the first component 51-1 has a wedge shape. More specifically, the first component 51-1 has a wedge shape whose thickness decreases towards a first direction DR1. In a cross-section including the first axis AX, the second component 51-2 has a wedge shape. More specifically, the second component 51-2 has a wedge shape whose thickness decreases towards a second direction DR2. Figure 27 In the described example, the outer surface of the first component 51-1 has a fifth inclined surface AS5, and the inner surface of the second component 51-2 has a sixth inclined surface AS6 that contacts the fifth inclined surface AS5. The fifth inclined surface AS5 is an inclined surface whose distance from the first axis AX increases as it moves toward the second direction DR2. Similarly, the sixth inclined surface AS6 is an inclined surface whose distance from the first axis AX increases as it moves toward the second direction DR2. In this case, by moving the second component 51-2 of the attachment 51 relative to the through hole 3h and the first component 51-1 of the attachment 51 relative to the second direction DR2, the first component 51-1 of the attachment 51 is displaced in a direction closer to the first axis AX. Furthermore, by placing a rolling element such as a roller or ball, or an elastic body such as an O-ring, on one of the outer surface of the first component 51-1 and the inner surface of the second component 51-2, a state in which a preload is applied to the outer surface of the first component 51-1 and the inner surface of the second component 51-2 can be achieved.

[0152] exist Figure 27 In the described example, at least a portion of attachment 51 can reduce its diameter in a direction approaching the first axis AX. More specifically, the first component 51-1 of attachment 51 disposed in the through hole portion 3h can reduce its diameter in a direction approaching the first axis AX, such that the third distance L3 between the innermost part 511n of attachment 51 and the first axis AX is smaller than the fourth distance L4 between the innermost surface 322n of the through hole portion 3h and the first axis AX. Figure 28 The diagram shows the first component 51-1 of Annex 51 with its diameter reduced towards the direction of the first axis AX. Figure 28 In the example described, when the first component 51-1 of Annex 51 is in a state with a reduced diameter, the first component 51-1 has a shape that elastically deforms from the default shape.

[0153] When at least a portion of attachment 51 (in other words, a part or all of attachment 51) can reduce its diameter in a direction close to the first axis AX, the size of the gap G6 between the inner surface 51n of attachment 51 and the outer surface 22t of the front end portion 22 of the rotating shaft 2 can be easily adjusted. Furthermore, the reduction in diameter of at least a portion of attachment 51 can be performed either after the front end portion 22 of the rotating shaft 2 is inserted into the through hole portion 3h, or before the front end portion 22 of the rotating shaft 2 is inserted into the through hole portion 3h.

[0154] The first component 51-1 of Annex 51 can be a ring component (e.g., a C-shaped ring component with a slit). When the first component 51-1 is a C-shaped ring component, the diameter of the first component 51-1 can be easily reduced in the direction close to the first axis AX. The second component 51-2 of Annex 51 can also be a ring component (e.g., a circular ring portion without a slit).

[0155] (Pressing component 55) exist Figure 27 In the described example, the workpiece support device 1C for a machine tool includes a pressing member 55 that presses the attachment 51 (more specifically, the second component 51-2) in the second direction DR2. By pressing the attachment 51 in the second direction DR2, the pressing member 55 enables the attachment 51 (more specifically, the second component 51-2) to move relative to the through hole portion 3h in a direction parallel to the first axis AX (more specifically, the second direction DR2). Furthermore, the attachment 51 (more specifically, the second component 51-2) moves in the second direction DR2 by being pressed by the pressing member 55, thereby displacing the inner surface 51n of the attachment 51 in a direction toward the outer surface 22t of the front end portion 22 of the rotating shaft 2 (see reference). Figure 28 This reduces the gap G6 between the inner surface 51n of the attachment 51 and the outer surface 22t of the front end 22.

[0156] exist Figure 28 In the example described, by simply moving the pressing member 55 in the second direction DR2, the inner surface 51n of the attachment 51 is displaced in the direction toward the outer surface 22t of the front end 22 of the rotating shaft 2. As a result, the gap G6 between the inner surface 51n of the attachment 51 and the outer surface 22t of the front end 22 of the rotating shaft 2 can be reduced.

[0157] exist Figure 27 In the described example, the pressing member 55 has a first threaded portion 551 that converts the rotational force acting on the pressing member 55 into the pressing force of the pressing attachment 51. In other words, the pressing member 55 includes a threaded member 55a capable of converting the rotational force acting on the pressing member 55 into the pressing force of the pressing attachment 51.

[0158] exist Figure 27 In the described example, the first threaded portion 551 of the threaded component 55a engages with the internal threaded portion 31m of the rotating body 31. Furthermore, in Figure 27 In the examples described, the threaded part 55a is a bolt having a recess 552 that can engage with tools such as wrenches and screwdrivers.

[0159] (How to use a machine tool) Reference Figures 1 to 33 The method of using the machine tool described in the implementation method is explained. Figure 31 This is a diagram illustrating an example of the steps for installing accessory 51 onto the front end 22 of the rotating shaft 2. Figure 32 as well as Figure 33 This is a flowchart illustrating an example of how to use a machine tool according to an implementation method.

[0160] The machine tool 100 used in the method of using the machine tool in the embodiment can be the machine tool 100A of the first embodiment, the machine tool 100B of the second embodiment, the machine tool 100C of the third embodiment, or other machine tools.

[0161] The machine tool 100 used in the machine tool usage method of the embodiment includes: a workpiece support device 1; a tool holding device 110 for holding a tool T; and a second drive device 120 for moving the tool holding device 110. Since the workpiece support device 1, the tool holding device 110, and the second drive device 120 have already been described in the first, second, or third embodiments, repeated descriptions of these components are omitted.

[0162] In the first step ST1, accessory 51 is installed onto the front end 22 of the rotating shaft 2 or the through hole 3h of the first support device 3. First step ST1 is the accessory installation process. (Refer to...) Figure 31 An example of the method for mounting the attachment 51 to the front end portion 22 of the rotating shaft 2 will be described. In sub-step ST1-1, the attachment 51 is positioned onto the outer surface 22t of the front end portion 22 of the rotating shaft 2. In sub-step ST1-2, the collar 55b is positioned onto the front end portion 22 of the rotating shaft 2 such that it contacts the end portion of the attachment 51 on the first direction DR1 side. Furthermore, as... Figure 23As illustrated, sub-step ST1-2 is omitted when collar 55b is omitted. In sub-step ST1-3, nut 28 (more specifically, cap nut) is installed onto the front end of rotating shaft body 20. By performing sub-step ST1-3, the installation of accessory 51 onto the front end 22 of rotating shaft 2 is completed.

[0163] exist Figure 31 In the described example, the threaded component 55a is pre-inserted into the threaded hole 28h of the nut 28. In this case, the threaded component 55a is configured opposite to the collar 55b or accessory 51 by mounting the nut 28 to the front end 22 of the rotating shaft 2. Alternatively, as Figure 23 As illustrated, the threaded part 55a of the pressing attachment 51 can be the nut 28 itself. In this case, the nut 28, as the threaded part 55a, is configured opposite to the collar 55b or attachment 51 by installing the nut 28 to the front end of the rotating shaft body 20.

[0164] In the second step ST2, the elongated workpiece (in other words, the first workpiece W1) is mounted onto the rotating shaft 2. More specifically, in the second step ST2, the first workpiece W1 is held in place by a chuck 25 that forms part of the rotating shaft 2. The second step ST2 is the first workpiece mounting process.

[0165] In the third step ST3, the first workpiece W1 is rotated about the first axis AX. The third step ST3 is the first rotation process. In the first rotation process, the first workpiece W1, held by the front end 22 of the rotating shaft 2 and supported by the guide sleeve unit 9 (more specifically, the guide sleeve 91 of the guide sleeve unit 9) installed in the through hole portion 3h, is rotated about the first axis AX (see reference). Figure 3 , Figure 19 or Figure 25 (Arrow AR3 in the image).

[0166] The first rotational process includes the spindle motor 7 rotating the rotating shaft 2 relative to the shaft support member 60 about a first axis AX. Alternatively, preferably, the first rotational process includes a rotation drive device 38 rotating the rotating body 31 of the retaining guide sleeve adapter 92 relative to the rotating body support member 33 about a second axis AX2. The second axis AX2 is substantially coaxial with the first axis AX. In the first rotational process, it is preferable to rotate the rotating shaft 2 synchronously with the rotating body 31 of the retaining guide sleeve adapter 92.

[0167] In step ST4, the first workpiece W1 is machined using tool T. Step ST4 is the first machining operation. The first machining operation is performed during step ST3 (the first rotary operation) (see reference). Figure 3 , Figure 19 or Figure 25 ).

[0168] The first machining operation is performed with the first workpiece W1 supported by both the front end 22 of the rotating shaft 2 and the guide sleeve 91. Therefore, deflection of the first workpiece W1 can be suppressed, and the first workpiece W1 can be machined with high precision. When the machine tool 100 is equipped with an air supply device 8, it is preferable to perform the first machining operation with a second air curtain J2 formed by air discharged from the gap G5 between the rotating body 31 and the rotating body support member 33 (see [reference]). Figure 18 ).

[0169] In step ST5, the first workpiece W1 is moved in a direction parallel to the first axis AX. Step ST5 is the first moving operation. In the first moving operation, the rotation axis 2 of the first workpiece W1 is moved relative to the guide sleeve 91 in a direction parallel to the first axis AX (see reference). Figure 3 , Figure 19 or Figure 25 (See arrow AR1 in the diagram). This relative movement changes the machining position of the tool T relative to the first workpiece W1. The first movement operation is performed during the execution of the third step ST3 (first rotary operation).

[0170] The first moving step includes the second support device 6 moving the rotating shaft 2 in a direction parallel to the first shaft AX.

[0171] In step ST6, the guide sleeve unit 9 (more specifically, the guide sleeve adapter 92) is removed from the first support device 3. Step ST6 is the removal process of the guide sleeve adapter. In the removal process, the guide sleeve adapter 92 is removed from the through hole 3h of the first support device 3 (see reference). Figure 4 , Figure 21 or Figure 26 ).

[0172] In the seventh step ST7, the outer surface 51t of the attachment 51, which contacts the outer surface 22t of the front end 22 of the rotating shaft 2, is displaced in a direction away from the first axis AX. The seventh step ST7 is a displacement process. The displacement process can be performed using an inclined surface AS provided on at least one of the attachment 51 and the rotating shaft 2. This inclined surface AS converts the movement of the attachment 51 in a direction parallel to the first axis AX into displacement of the outer surface 51t of the attachment 51 in a direction away from the first axis AX (see reference). Figure 7 or Figure 23 The attachment 51 can be moved in a direction parallel to the first axis AX by pressing it in the second direction DR2 by the pressing member 55. During the displacement process, at least a portion of the attachment 51 can expand its diameter in a direction away from the first axis AX.

[0173] Alternatively, in the seventh step ST7, the inner surface 51n of the attachment 51, which contacts the inner surface 32n of the through hole 3h, can be displaced in a direction approaching the first axis AX. The seventh step ST7 (displacement process) can be performed using an inclined surface AS provided on at least one of the attachment 51 and the through hole 3h. This inclined surface AS converts the movement of the attachment 51 in a direction parallel to the first axis AX into a displacement of the inner surface 51n of the attachment 51 in a direction approaching the first axis AX (see reference). Figure 28 The attachment 51 can be moved in a direction parallel to the first axis AX by pressing it in the second direction DR2 by the pressing member 55. During the displacement process, at least a portion of the attachment 51 can reduce its diameter in a direction closer to the first axis AX.

[0174] After the removal of the guide sleeve adapter (step 6), the displacement process (step 7, ST7) is performed. Alternatively, the displacement process (step 7, ST7) may be performed immediately after the installation of the accessory (step 1, ST1).

[0175] In the eighth step ST8, the front end portion 22 of the rotating shaft 2 (e.g., the rotating shaft 2 with accessory 51 mounted) is positioned inside the through hole portion 3h of the first support device 3. The eighth step ST8 is a configuration process. This configuration process includes positioning the front end portion 22 of the rotating shaft 2 inside the through hole portion 3h (more specifically, the first region RG1 inside the through hole portion 3h occupied by the guide sleeve unit 9) by moving the rotating shaft 2 in a direction parallel to the first axis AX. Additionally, the configuration process includes moving the rotating shaft 2 in a direction parallel to the first axis AX using the second support device 6.

[0176] The configuration process may also include positioning the front end portion 22 of the rotating shaft 2 from a first position located on the second direction DR2 side of the end portion 3e, which is closer to the second direction DR2 than the through hole portion 3h of the first support device 3 (see reference). Figure 4 The end 3e, located on the second direction DR2 side of the through hole 3h, is changed to a second position near the first direction DR1 (refer to...). Figure 5 Alternatively, the configuration process may also include positioning the front end portion 22 of the rotating shaft 2 from the second region RG2 inside the through hole 3h of the first support device 3 (see reference). Figure 20 The first region RG1 inside the 3h through hole (refer to) is changed to the first region RG1 inside the through hole (refer to) Figure 22 ).

[0177] In step ST9, the second workpiece W2 is rotated about the first axis AX. Step ST9 is the second rotation operation. In the second rotation operation, the front end 22 of the rotating shaft 2 rotates together with the second workpiece W2 held by the front end 22 about the first axis AX (see reference). Figure 14 , Figure 22 or Figure 29 (Arrow AR4 in the image). Alternatively, the second workpiece W2 can be a workpiece obtained by cutting off the front end portion of the first workpiece W1 and separating it from the remaining portion of the first workpiece W1 (in other words, a part of the first workpiece W1), or it can be a workpiece completely different from the first workpiece W1.

[0178] The second rotation process includes the spindle motor 7 rotating the rotating shaft 2 relative to the shaft support member 60 about the first axis AX. Alternatively, preferably, the second rotation process includes a rotation drive device 38 rotating the rotating body 31 (with the guide sleeve adapter 92 removed) relative to the rotating body support member 33 about the second axis AX2. The second axis AX2 is substantially coaxial with the first axis AX. Furthermore, in the second rotation process, it is preferable that the rotating shaft 2 and the rotating body 31 (with the guide sleeve adapter 92 removed) rotate synchronously.

[0179] In step 10 (ST10), the second workpiece W2 is machined using tool T. Step 10 (ST10) is the second machining operation. The second machining operation is performed during step 9 (ST9, the second rotary operation) (see reference). Figure 14 , Figure 22 or Figure 29 ).

[0180] like Figure 7 , Figure 23 As illustrated, the second machining operation is performed when the first distance L1 between the outermost surface 511t of attachment 51 and the first axis AX is greater than the second distance L2 between the outermost surface 222t of the front end portion 22 of the rotating shaft 2 and the first axis AX. Alternatively, as... Figure 28 As illustrated, the second machining step is performed when the third distance L3 between the innermost part 511n of attachment 51 and the first axis AX is less than the fourth distance L4 between the innermost surface 322n of the through hole 3h and the first axis AX. The second machining step is performed when the displacement of the front end 22 of the rotating shaft 2 in the direction perpendicular to the first axis AX is reduced by attachment 51. This suppresses the deflection of the rotating shaft 2, enabling high-precision machining of the second workpiece W2.

[0181] When the machine tool 100 is equipped with an air supply device 8, the second machining operation is performed in a state where the air discharged from the gap G4 between the inner surface 32n of the through hole 3h and the outer surface of the front end 22 of the rotating shaft 2 forms a first air curtain J1 (see reference). Figure 16 or Figure 28 Furthermore, it is preferable to perform the second processing step while the air discharged from the gap G5 between the rotating body 31 and the rotating body support member 33 forms a second air curtain J2.

[0182] In step eleven, ST11, the second workpiece W2 is moved in a direction parallel to the first axis AX. Step eleven, ST11, is the second moving step. In the second moving step, the rotation axis 2 holding the second workpiece W2 is moved relative to the through hole 3h of the first support device 3 in a direction parallel to the first axis AX (see reference). Figure 14 , Figure 22 or Figure 29 (See arrow AR2 in the diagram). This relative movement allows the tool T to change its machining position relative to the second workpiece W2. The second movement operation is performed during the execution of the ninth step ST9 (second rotary operation).

[0183] The second moving process includes the second support device 6 moving the rotating shaft 2 in a direction parallel to the first shaft AX.

[0184] As described above, in the machine tool usage method of this embodiment, the first workpiece W1 is machined while it is supported by both the front end portion 22 of the rotating shaft 2 and the guide sleeve 91. Therefore, deflection of the first workpiece W1 can be suppressed, and the first workpiece W1 can be machined with high precision. Furthermore, in the machine tool usage method of this embodiment, the second workpiece W2 is machined while the displacement of the front end portion 22 of the rotating shaft 2 in the direction perpendicular to the first axis AX is reduced. Therefore, deflection of the rotating shaft 2 can be suppressed, and the second workpiece W2 can be machined with high precision.

[0185] This invention is not limited to the above-described embodiments or modifications. Within the scope of the technical concept of this invention, the embodiments or modifications can obviously be appropriately modified or changed. Furthermore, various techniques used in the embodiments or modifications can be applied to other embodiments or modifications as long as they do not cause technical contradictions. In addition, any additional components in the embodiments or modifications can be appropriately omitted. Explanation of reference numerals in the attached figures:

[0186] 1, 1A, 1B, 1C: Workpiece support device; 2: Rotary shaft; 3: First support device; 3e: End of through hole; 3h: Through hole; 6: Second support device; 7: Spindle motor; 8: Air supply device; 9: Guide sleeve unit; 20: Rotary shaft body; 20p: External thread; 21: Rear end; 22: Front end; 22t: Outer surface; 23: Central part; 24: Engaging part; 25: Chuck; 25e: Front end; 25n: Inner surface; 26: Chuck operating shaft; 27: Operating shaft drive device; 28: Nut; 28h: Threaded hole; 28m: Second thread; 2 8p: Internal threaded portion; 29: Force-applying component; 31: Rotating body; 31m: Internal threaded portion; 32d: Recess; 32n: Inner surface; 33: Rotating body support component; 35: Second bearing assembly; 36: Engaging component; 38: Rotation drive device; 41: First bearing assembly; 41a: First bearing; 41b: Second bearing; 51: Accessory; 51-1: First component; 51-2: Second component; 51A, 51B: Ring component; 51n: Inner surface; 51r: Gap; 51t: Outer surface; 55: Pressing component; 55a: Threaded component; 55b: Shaft collar; 60: Shaft support component ; 60b: Block; 66: First drive unit; 71: Stator; 72: Rotor; 91: Guide sleeve; 91h: Hollow hole; 92: Guide sleeve adapter; 100, 100A, 100B, 100C: Machine tool; 110: Tool holding device; 120: Second drive unit; 222t: Outermost surface; 321n: Conical inner surface; 322n: Innermost surface; 324: Airflow channel; 324a: Part of the airflow channel; 325: Injection nozzle; 381: Second motor; 383: Drive belt; 511n: Innermost; 511t: Outermost; 515: Ring body; 516: Foot Part; 551: First threaded part; 552: Recess; 661: First motor; 663: Lead screw shaft; AS: Inclined surface; AS1: First inclined surface; AS2: Second inclined surface; AS3: Third inclined surface; AS4: Fourth inclined surface; AS5: Fifth inclined surface; AS6: Sixth inclined surface; G1, G2, G3, G4, G5, G6: Clearance; J1: First air curtain; J2: Second air curtain; K: Tool; M1: Groove; M2: Protrusion; T: Cutting tool; W: Workpiece; W1: First workpiece; W2: Second workpiece; Wa: First part of workpiece; Wb: Second part of workpiece.

Claims

1. A workpiece support device for a machine tool, wherein, The workpiece support device for the machine tool includes: A rotating shaft supports the workpiece and can rotate around a first axis; The first support device has a through hole portion capable of supporting and holding the guide sleeve adapter, and is capable of accommodating the front end of the rotating shaft in the through hole portion; The second support device supports the rotating shaft, allowing the rotating shaft to move relative to the first support device in a direction parallel to the first shaft. as well as The accessory is located on the outer surface of the front end of the rotating shaft or the inner surface of the through hole. At least a portion of the attachment is capable of displacement away from the first axis, such that a first distance between the outermost part of the attachment disposed at the front end of the rotating shaft and the first axis is greater than a second distance between the outermost surface of the front end of the rotating shaft and the first axis, or... At least a portion of the attachment is displaceable toward the first axis such that a third distance between the innermost part of the attachment disposed in the through hole and the first axis is less than a fourth distance between the innermost surface of the through hole and the first axis. At least one of the attachment and the rotating shaft has an inclined surface that converts relative movement of the attachment with respect to the rotating shaft in a direction parallel to the first shaft into displacement of at least a portion of the attachment in a direction away from the first shaft, or, At least one of the attachment and the through hole has an inclined surface that converts the relative movement of the attachment with respect to the through hole in a direction parallel to the first axis into a displacement of at least a portion of the attachment in a direction approaching the first axis.

2. The workpiece support device for machine tools according to claim 1, wherein, The state of the accessory configured on the rotating axis can be changed from a first state where the first distance is less than the second distance to a second state where the first distance is greater than the second distance, or... It is possible to change the state of the accessory disposed in the through hole from a third state where the third distance is greater than or equal to the fourth distance to a fourth state where the third distance is less than or equal to the fourth distance.

3. The workpiece support device for a machine tool according to claim 1 or 2, wherein, At least a portion of the accessory configured on the rotation axis is capable of expanding its diameter in a direction away from the first axis, such that the first distance is greater than the second distance, or... At least a portion of the accessory disposed in the through hole is capable of reducing its diameter in a direction closer to the first axis, so that the third distance is smaller than the fourth distance.

4. The workpiece support device for machine tools according to claim 1, wherein, The workpiece support device for the machine tool also includes a pressing member, which presses the attachment in a direction parallel to the first axis by pressing the attachment in a direction from the front end of the rotating shaft toward the rear end of the rotating shaft.

5. The workpiece support device for a machine tool according to claim 4, wherein, The pressing component includes a threaded component that converts the rotational force acting on the pressing component into a pressing force for pressing the attachment.

6. The workpiece support device for a machine tool according to claim 1 or 2, wherein, The accessory includes a ring component.

7. The workpiece support device for a machine tool according to claim 1 or 2, wherein, The rotating shaft has: Rotating shaft body; The chuck holds the workpiece; and Nuts are provided to prevent the chuck from detaching from the rotating shaft body and to prevent the accessory from detaching from the rotating shaft body.

8. The workpiece support device for a machine tool according to claim 1 or 2, wherein, With the accessory installed on the front end of the rotating shaft or the through hole of the first support device, the front end of the rotating shaft can move from the outside of the through hole to the inside of the through hole.

9. The workpiece support device for a machine tool according to claim 1 or 2, wherein, The workpiece support device for the machine tool also includes a spindle motor that rotates the rotating axis around the first axis. The second support device includes: A shaft support component supports the rotating shaft so that it can rotate about the first shaft; as well as The first driving device moves the shaft support component in a direction parallel to the first shaft. The first drive device enables the rotating shaft, the shaft support component, and the spindle motor to move relative to the first support device in a direction parallel to the first shaft.

10. The workpiece support device for a machine tool according to claim 1 or 2, wherein, The second support device includes: A shaft support component supports the rotating shaft so that it can rotate about the first shaft; as well as The first driving device moves the shaft support component in a direction parallel to the first shaft. The first support device includes a spindle motor that rotates the rotating shaft about the first shaft relative to the shaft support member. The first drive device causes the rotating shaft and the shaft support component to move relative to the first support device and the spindle motor in a direction parallel to the first shaft.

11. The workpiece support device for a machine tool according to claim 10, wherein, The workpiece can be supported by the guide sleeve disposed in the first region inside the through hole of the first support device and the front end of the rotating shaft disposed in the second region inside the through hole.

12. The workpiece support device according to claim 1 or 2, wherein, An injection port for injecting air supplied from an air supply device is formed on the inner circumferential surface of the through hole of the first support device.

13. A machine tool, wherein, The machine tool includes: Workpiece support device; Tool holding device, for holding the tool; and The second driving device moves the tool holding device. The workpiece support device includes: A rotating shaft supports the workpiece and can rotate around a first axis; The first support device has a through hole portion capable of supporting and holding the guide sleeve adapter, and is capable of accommodating the front end of the rotating shaft in the through hole portion; The second support device supports the rotating shaft, allowing the rotating shaft to move relative to the first support device in a direction parallel to the first shaft. as well as The accessory is located on the outer surface of the front end of the rotating shaft or the inner surface of the through hole. At least a portion of the attachment is capable of displacement away from the first axis, such that a first distance between the outermost part of the attachment disposed at the front end of the rotating shaft and the first axis is greater than a second distance between the outermost surface of the front end of the rotating shaft and the first axis, or... At least a portion of the attachment is displaceable toward the first axis such that a third distance between the innermost part of the attachment disposed in the through hole and the first axis is less than a fourth distance between the innermost surface of the through hole and the first axis. At least one of the attachment and the rotating shaft has an inclined surface that converts relative movement of the attachment with respect to the rotating shaft in a direction parallel to the first shaft into displacement of at least a portion of the attachment in a direction away from the first shaft, or, At least one of the attachment and the through hole has an inclined surface that converts the relative movement of the attachment with respect to the through hole in a direction parallel to the first axis into a displacement of at least a portion of the attachment in a direction approaching the first axis.

14. A method of using a machine tool, wherein, The machine tool includes: Workpiece support device; Tool holding device, for holding the tool; and The second driving device moves the tool holding device. The workpiece support device includes: A rotating axis that can rotate about a first axis; The first support device has a through hole portion capable of supporting and holding the guide sleeve adapter, and is capable of accommodating the front end of the rotating shaft in the through hole portion; The second support device supports the rotating shaft, allowing the rotating shaft to move relative to the first support device in a direction parallel to the first shaft. as well as The accessory is located on the outer surface of the front end of the rotating shaft or the inner surface of the through hole. At least one of the attachment and the rotating shaft has an inclined surface that converts relative movement of the attachment with respect to the rotating shaft in a direction parallel to the first shaft into displacement of at least a portion of the attachment in a direction away from the first shaft, or, At least one of the attachment and the through hole has an inclined surface that converts the relative movement of the attachment with respect to the through hole in a direction parallel to the first axis into a displacement of at least a portion of the attachment in a direction approaching the first axis. The method of use includes: In the first rotation process, a first workpiece held by the front end of the rotating shaft and supported by the guide sleeve is rotated about the first shaft. In the first processing step, during the execution of the first rotational process, the first workpiece is processed by the cutting tool; The disassembly process involves removing the guide sleeve adapter from the through hole. In the configuration process, the front end of the rotating shaft is positioned inside the through hole by moving the rotating shaft in a direction parallel to the first shaft. The second rotation process involves rotating the front end of the rotating shaft together with the second workpiece held by the front end about the first shaft; and In the second machining step, during the execution of the second rotation step, the second workpiece is machined using the cutting tool. The second processing step is performed when the first distance between the outermost part of the accessory disposed at the front end of the rotating shaft and the first shaft is greater than the second distance between the outermost surface of the front end of the rotating shaft and the first shaft, or when the third distance between the innermost part of the accessory disposed at the through hole and the first shaft is less than the fourth distance between the innermost surface of the through hole and the first shaft.

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