Stabilizer and machine tool

Abstract

To provide a swinging preventive device which can suppress swinging of a workpiece in a simple structure.SOLUTION: A swinging preventive device (3) comprises: an arm part (9) fixed to a movement mechanism which moves the swinging preventive device (3); a slide mechanism (10) which is arranged at a tip part of the arm part (9) and is slidable toward the workpiece (W) or in the opposite side of the workpiece (w); two rollers arranged at a tip part of the slide mechanism (10) in contact with the workpiece (W); an energization mechanism (13) which energizes the two rollers into the workpiece (W) at a contacting attitude of the swinging preventive device (3); and a fixing mechanism (14) which fixes the positions of the two rollers.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a vibration damping device and a working device, for example, to a vibration damping device and a working device for suppressing the vibration of a workpiece when machining the workpiece supported on the work spindle of a machine tool.

Background Art

[0002] When machining a workpiece supported by a machine tool, the workpiece is pushed in by a tool for machining the workpiece, and the workpiece is bent. Therefore, in order to ensure the machining accuracy of the workpiece, it is preferable to suppress the vibration of the workpiece when machining the workpiece.

[0003] For example, the vibration damping device of Patent Document 1 supports a first rotating roller, a first support member through which a cam member passes, supports a second roller, and a second support member provided with a passive roller that contacts the cam member, supports a third roller, a third support member provided with a passive roller that contacts the cam member, and a drive mechanism that moves the first support member and the cam member in the vertical direction.

[0004] Such a vibration damping device of Patent Document 1 operates the drive mechanism by hydraulic oil pressurized from a hydraulic pump so that the first roller contacts the lower end portion of the workpiece, moves the first support member and the cam member upward, and operates the second roller and the third roller to grip the workpiece via the cam member.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The applicant has identified the following problem: The vibration damping device described in Patent Document 1 has a configuration in which the drive mechanism is operated by hydraulic fluid pressurized from a hydraulic pump, and has the problem of having a complex configuration.

[0007] This disclosure was made in view of these problems, and aims to realize a steady-state control device and a machine tool that can suppress workpiece runout with a simple configuration. [Means for solving the problem]

[0008] A steady rest device according to one aspect of the present disclosure is a steady rest device for suppressing runout of a workpiece supported on the workpiece spindle of a machine tool when machining the workpiece, An arm portion fixed to a moving mechanism that moves the stabilizer device to a contact position in which the stabilizer device contacts the workpiece from the side opposite to the side where the tool for machining the workpiece is positioned, with the workpiece in between; The anti-vibration device is positioned at the tip of the arm and includes a sliding mechanism that allows the anti-vibration device to slide toward the workpiece and toward the opposite side relative to the workpiece while in the contact position, The slide mechanism is positioned at the tip of the slide mechanism and the anti-vibration device has two rollers that contact the workpiece in the contact position, The aforementioned vibration damping device includes a biasing mechanism that biases the two rollers toward the workpiece in the contact position, A fixing mechanism for fixing the positions of the two rollers, It is equipped with.

[0009] In the above-described stabilizer, when the stabilizer is in the contact position, the two rollers are each rotatable around a rotation axis that is arranged parallel to the central axis of the workpiece. When the bracing device is in the contact position, it is preferable that, when viewed from the radial direction of the workpiece, one of the two rollers contacts one region of the workpiece with the central axis of the workpiece in between, and the other roller contacts the other region of the workpiece with the central axis of the workpiece in between.

[0010] In the above-described stabilizer, the machine tool is a composite machine tool including a turning center, The aforementioned moving mechanism is a swivel-type tool post of the machine tool, Preferably, the tool post is rotatable around a rotation axis parallel to the central axis of the workpiece while the machine tool is supporting the workpiece.

[0011] In the above-described anti-vibration device, it is preferable that the tool post is immovable in the direction in which the sliding mechanism can slide when the anti-vibration device is in the contact position.

[0012] A machine tool relating to one aspect of this disclosure is: The aforementioned vibration damping device, A machine tool having the aforementioned moving mechanism, It is equipped with. [Effects of the Invention]

[0013] According to this disclosure, a steady-resisting device and a machine tool capable of suppressing workpiece runout can be realized with a simple configuration. [Brief explanation of the drawing]

[0014] [Figure 1] This is a diagram illustrating a typical example of the configuration of the machine tool according to the embodiment. [Figure 2] This is a view of the vibration damping device of the embodiment, seen from the Y-axis side. [Figure 3] This is a partial cross-sectional view illustrating the configuration of the sliding mechanism, biasing mechanism, and fixing mechanism of the anti-vibration device according to the embodiment. [Figure 4] This diagram illustrates the process of bringing a steady rest device into contact with a workpiece to suppress workpiece runout when machining a workpiece using the machine tool of the embodiment. [Figure 5] This diagram illustrates the process of bringing a steady rest device into contact with a workpiece to suppress workpiece runout when machining a workpiece using the machine tool of the embodiment. [Figure 6]This is a diagram for explaining the process of bringing a vibration damping device into contact with a workpiece in order to suppress the vibration of the workpiece when machining the workpiece using the machining apparatus according to the embodiment.

Embodiments for Carrying out the Invention

[0015] Hereinafter, specific embodiments to which the present disclosure is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings are appropriately simplified.

[0016] First, a representative example of the configuration of the machining apparatus according to the present embodiment will be described. FIG. 1 is a diagram for explaining a representative example of the configuration of the machining apparatus according to the present embodiment. Here, in the following description, for clarity of explanation, a three-dimensional (XYZ) coordinate system may be used for the explanation.

[0017] Note that the + side of the X axis is the front side of the machining apparatus, and the - side of the X axis is the rear side of the machining apparatus. The + side of the Y axis is the left side of the machining apparatus, and the - side of the Y axis is the right side of the machining apparatus. The + side of the Z axis is the upper side of the machining apparatus, and the - side of the Z axis is the lower side of the machining apparatus.

[0018] As shown in FIG. 1, the machining apparatus 1 includes a machine tool 2 and a vibration damping device 3. The machine tool 2 can be configured by a composite machine tool including, for example, a turning center, and includes a tool spindle 4, a first workpiece spindle 5, a second workpiece spindle 6, and a tool rest 7.

[0019] The tool spindle 4, the first workpiece spindle 5, the second workpiece spindle 6, and the tool rest 7 are each configured to perform operations substantially similar to those of a general composite machine tool by the driving force of respective drive mechanisms controlled by, for example, a control device.

[0020] The tool spindle 4 is movable in the X, Y, and Z directions. The tool spindle 4 can support tools, probes, etc. In the example shown in Figure 1, the tool spindle 4 supports the tool 8. The tool 8 is, for example, a tool that contacts the workpiece W from the X-axis side to machine the workpiece W, as will be described later, and is shown in a simplified manner in Figure 1.

[0021] The first workpiece spindle 5 is rotatable around the Y-axis. The first workpiece spindle 5 can support the Y-axis+ end of a workpiece W extending in the Y-axis direction by a chuck 5a, for example, as shown in Figure 1. Here, the workpiece W has a shape that includes at least a portion of a cylindrical section where no gears or the like are formed.

[0022] As shown in Figure 1, the second workpiece spindle 6 is positioned opposite the first workpiece spindle 5 in the Y-axis direction. The second workpiece spindle 6 is rotatable around the Y-axis. The second workpiece spindle 6 can support the Y-axis end of the workpiece W, for example, by a chuck 6a.

[0023] The tool post 7 is often a typical turret, and is configured to support multiple tools and a stabilizer 3 on its circumferential surface. The tool post 7 is rotatable (swivels) around the Y-axis and is also movable, for example, in the Y-axis and Z-axis directions.

[0024] At this time, with the workpiece W supported by the first workpiece spindle 5 and the second workpiece spindle 6, the tool post 7 is positioned on the Z-axis side relative to the workpiece W, and when viewed from the Z-axis direction, the rotation axis AX1 of the tool post 7 is positioned to approximately coincide with the central axis AX2 of the workpiece W (see Figure 4). In other words, when viewed from the Z-axis direction, the rotation axis AX1 of the tool post 7 is positioned to approximately coincide with the rotation axes of the first workpiece spindle 5 and the second workpiece spindle 6.

[0025] The vibration stabilizer 3 suppresses the runout of the workpiece W when the workpiece W is machined with the tool 8. Figure 2 is a view of the vibration stabilizer of this embodiment from the Y-axis side. Figure 3 is a partial cross-sectional view illustrating the configuration of the sliding mechanism, biasing mechanism, and fixing mechanism of the vibration stabilizer of this embodiment.

[0026] Here, as will be described later, Figures 2 and 3 show the state in which the stabilizer 3 is in contact with the workpiece W, which is supported by the first workpiece spindle 5 and the second workpiece spindle 6, from the X-axis + side. The following description of the configuration of the stabilizer 3 will be based on the state shown in Figures 2 and 3.

[0027] As shown in Figures 2 and 3, the vibration damping device 3 comprises an arm portion 9, a sliding mechanism 10, a first roller 11, a second roller 12, a biasing mechanism 13, and a fixing mechanism 14. When viewed from the Y-axis direction, the arm portion 9 has a bent shape in which the portion on the X-axis+ side of the arm portion 9 is bent toward the Z-axis+ side.

[0028] As shown in Figures 2 and 3, for example, the arm portion 9 comprises a first portion 9a extending substantially in the X-axis direction when viewed from the Y-axis direction, a second portion 9b that slopes toward the Z-axis direction as it moves toward the X-axis direction from the X-axis-positive end of the first portion 9a, and a third portion 9c that extends toward the X-axis direction from the X-axis-positive end of the second portion 9b, and has a substantially rectangular XY cross-sectional shape.

[0029] As shown in Figures 2 and 3, the slide mechanism 10 comprises a slide portion 10a and a guide portion 10b. The slide portion 10a comprises a roller support portion 10c and a slide arm portion 10d. The roller support portion 10c has a substantially C-shape, for example, when viewed from the Z-axis direction, with the X-axis side open and extending in the Z-axis direction.

[0030] The slide arm portion 10d has a roughly rectangular column shape, as shown in Figure 3, for example, and extends in the X-axis direction. The X-axis-side end of the slide arm portion 10d is fixed to the X-axis-side end of the roller support portion 10c. The slide arm portion 10d has a guide hole 10e formed therein that extends from the X-axis-side end of the slide arm portion 10d toward the X-axis-side.

[0031] As shown in Figures 2 and 3, the guide portion 10b has a roughly rectangular columnar shape and extends in the X-axis direction. The guide portion 10b is fixed to the Z-axis+ side surface of the third portion 9c of the arm portion 9. A guide groove 10f is formed on the Z-axis- side surface of the guide portion 10b, extending from the X-axis- side end of the guide portion 10b toward the X-axis+ side.

[0032] As shown in Figure 3, the slide arm portion 10d of the slide portion 10a in the slide mechanism 10 is inserted into the space formed by the guide groove 10f of the guide portion 10b and the third portion 9c of the arm portion 9 so as to be slidable in the X-axis direction. This allows the slide portion 10a to slide relative to the guide portion 10b in the X-axis direction.

[0033] As shown in Figure 3, a through hole 10g is formed in the side wall portion of the guide portion 10b on the X-axis + side, penetrating the side wall portion in the X-axis direction. The through hole 10g is formed to be substantially continuous with the guide hole 10e of the slide portion 10a of the slide mechanism 10 in the X-axis direction.

[0034] As shown in Figures 2 and 3, the first roller 11 has a substantially cylindrical shape extending in the Y-axis direction and is supported by the roller support portion 10c so as to be rotatable around the Y-axis, while being positioned within the open portion of the roller support portion 10c of the slide portion 10a.

[0035] As shown in Figures 2 and 3, the second roller 12 has a substantially cylindrical shape extending in the Y-axis direction and is positioned on the Z-axis side relative to the first roller 11. The second roller 12 is supported by the roller support portion 10c of the slide portion 10a so as to be rotatable around the Y-axis, while being positioned within the open portion of the roller support portion 10c of the slide portion 10a.

[0036] The biasing mechanism 13 biases the slide portion 10a toward the X-axis. As shown in Figure 3, the biasing mechanism 13 is equipped with an elastic body such as a coil spring and is inserted through the through hole 10g of the guide portion 10b of the slide mechanism 10 and into the guide hole 10e of the slide portion 10a.

[0037] As shown in Figure 3, the through hole 10g of the guide portion 10b in the slide mechanism 10 is covered by the cover member 15 from the X-axis + side, and the biasing mechanism 13 is positioned in a contracted state between the cover member 15 and the X-axis - end of the guide hole 10e of the slide portion 10a in the slide mechanism 10.

[0038] The fixing mechanism 14 fixes the positions of the first roller 11 and the second roller 12 in the X-axis direction. As shown in Figure 3, the fixing mechanism 14 is equipped with a bolt which is screwed into a female threaded portion 10h that penetrates the Z-axis direction through the Z-axis positive side ceiling portion of the guide portion 10b in the slide mechanism 10.

[0039] At this time, the Z-axis-side end of the female thread portion 10h reaches the guide groove 10f of the guide portion 10b in the slide mechanism 10. As a result, when the fixing mechanism 14 is screwed into the female thread portion 10h of the guide portion 10b in the slide mechanism 10, the Z-axis-side end of the fixing mechanism 14 contacts the slide arm portion 10d of the slide portion 10a in the slide mechanism 10, thereby restricting the movement of the slide portion 10a in the X-axis direction.

[0040] On the other hand, when the fixing mechanism 14 is loosened at the female thread portion 10h of the guide portion 10b in the slide mechanism 10, the Z-axis side end of the fixing mechanism 14 becomes non-contact with the slide arm portion 10d of the slide portion 10a in the slide mechanism 10, allowing the slide portion 10a to move in the X-axis direction.

[0041] In this type of anti-vibration device 3, the first portion 9a of the arm portion 9 is fixed to the tool post 7, allowing it to rotate around the Y axis and move in the Y-axis and Z-axis directions.

[0042] Next, we will explain the process of bringing the steady rest 3 into contact with the workpiece W in order to suppress the runout of the workpiece W when machining the workpiece W using the machine tool 1 of this embodiment. Figures 4 to 6 are diagrams illustrating the process of bringing the steady rest 3 into contact with the workpiece in order to suppress the runout of the workpiece when machining the workpiece using the machine tool of this embodiment.

[0043] Here, the stabilizer 3 is positioned on the X-axis+ side with respect to the workpiece W supported by the first workpiece spindle 5 and the second workpiece spindle 6 of the machine tool 1. The fixing mechanism 14 of the stabilizer 3 is in a loosened state. In other words, the sliding part 10a of the sliding mechanism 10 of the stabilizer 3 is in a state where it can slide relative to the guide part 10b.

[0044] Furthermore, as will be described later, the tool post 7 of the machine tool 1 is positioned in a state where it has moved in the Y-axis direction so that it rotates around the Y-axis and the first roller 11 and second roller 12 of the steady rest 3 come into contact with the cylindrical portion of the workpiece W.

[0045] In this state, first, as shown in Figure 4, the tool post 7 is moved to the Z-axis + side, and the tool post 7 is positioned at a height in the Z-axis direction such that the first roller 11 and the second roller 12 of the steady rest 3 contact the workpiece W when the tool post 7 of the machine tool 1 rotates around the Y-axis.

[0046] Next, as shown in Figure 5, the tool post 7 of the machine tool 1 is rotated counterclockwise when viewed from the Y-axis side. Then, as shown in Figure 6, the first roller 11 and the second roller 12 are brought into contact with the workpiece W from the X-axis side. In other words, the tool post 7 of the machine tool 1 functions as a moving mechanism that moves the stabilizer 3 to a contact position where the stabilizer 3 contacts the workpiece W from the X-axis side.

[0047] In this case, as shown in Figure 6, when viewed from the X-axis+ side, the first roller 11 should contact the region on the Z-axis+ side with respect to the central axis AX2 of the workpiece W, and the second roller 12 should contact the region on the Z-axis- side with respect to the central axis AX2 of the workpiece W.

[0048] Furthermore, even if the workpiece W is deflected, the first roller 11 and the second roller 12 should be brought into contact with the workpiece W while the workpiece W is rotating, so that the deflection of the workpiece W is arranged in a convex shape toward the X-axis.

[0049] Furthermore, since the sliding portion 10a of the sliding mechanism 10 is biased toward the X-axis by the biasing mechanism 13, the first roller 11 and the second roller 12 come into contact with the workpiece W in a way that they are pressed against it.

[0050] In this state, the fixing mechanism 14 is tightened to restrain the movement of the sliding portion 10a of the sliding mechanism 10 in the X-axis direction. This fixes the first roller 11 and the second roller 12 in contact with the workpiece W.

[0051] Subsequently, while rotating the workpiece W, the tool spindle 4, the first workpiece spindle 5, and the second workpiece spindle 6 are operated so that the tool 8 comes into contact with the workpiece W from the X-axis side and the workpiece W is machined. This allows the workpiece W to be machined.

[0052] As described above, in this embodiment, when machining a workpiece W with a tool 8, the first roller 11 and the second roller 12 of the stabilizer 3 can contact the workpiece W from the X-axis+ side, which is opposite to the X-axis- side where the tool 8 is positioned with the workpiece W in between. Therefore, the runout of the workpiece W when machining the workpiece W with the tool 8 can be suppressed.

[0053] In this embodiment, when the first roller 11 and second roller 12 of the stabilizer 3 of the stabilizer 3 are brought into contact with the workpiece W, the biasing force of the biasing mechanism 13 pushes the sliding portion 10a of the sliding mechanism 10 toward the X-axis, thereby bringing the first roller 11 and second roller 12 into contact with the workpiece W. Therefore, the stabilizer 1 and stabilizer 3 of this embodiment can suppress the vibration of the workpiece W with a simpler configuration compared to the stabilizer of Patent Document 1.

[0054] Furthermore, even if the tool post 7, as in the machine tool 1 of this embodiment, is configured to be immovable in the X-axis direction, the biasing force of the biasing mechanism 13 of the stabilizer 3 allows the first roller 11 and the second roller 12 to be moved toward the X-axis direction via the sliding mechanism 10. Therefore, even if the machine tool 1 does not have a mechanism to move the tool post 7 in the X-axis direction, the first roller 11 and the second roller 12 of the stabilizer 3 can be brought into good contact with the workpiece W.

[0055] Furthermore, when the first roller 11 and the second roller 12 of the stabilizer 3 come into contact with the workpiece W, if, viewed from the X-axis direction, the first roller 11 comes into contact with the Z-axis+ side region of the workpiece W relative to the central axis AX2, and the second roller 12 comes into contact with the Z-axis- side region of the workpiece W relative to the central axis AX2, the workpiece W can be stabilized during machining.

[0056] In this embodiment, the stabilizer 3 is supported by the tool post 7 of the machine tool 1. However, it is sufficient that the stabilizer 3 can be moved from the X-axis + side to a contact position where it contacts the workpiece W, and it may be supported by other moving mechanisms, not just the machine tool 2.

[0057] Furthermore, the configuration of the sliding mechanism 10 of the anti-vibration device 3 in this embodiment is a representative example, and any configuration that allows the first roller 11 and the second roller 12 to move toward and away from the workpiece W is acceptable.

[0058] Furthermore, the configuration of the fixing mechanism 14 of the anti-vibration device 3 in this embodiment is also a representative example, and any configuration that can fix the positions of the first roller 11 and the second roller 12 is acceptable.

[0059] Furthermore, the configuration of the machine tool 1 in this embodiment is a representative example, and for example, the tool post 7 may be configured to be movable in the X-axis direction.

[0060] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from the spirit of the invention. [Explanation of Symbols]

[0061] 1 Machining equipment 2 Machine tools 3. Stabilizer 4 Tool spindle 5. First workpiece spindle, 5a chuck 6. Second workpiece spindle, 6a chuck 7. Tool rest 8 Tools 9 Arm section, 9a First part, 9b Second part, 9c Third part 10 Slide mechanism, 10a Slide section, 10b Guide section, 10c Roller support section, 10d Slide arm section, 10e Guide hole, 10f Guide groove, 10g Through hole, 10h Female thread section 11 Laura 1 12. The Second Laura 13 Biasing mechanism 14 Fixing mechanism 15 Lid member AX1 Tool post rotation axis AX2 Workpiece Central Axis Double job

Claims

1. A steady rest device for suppressing runout of a workpiece supported on the spindle of a machine tool when machining the workpiece, An arm portion fixed to a moving mechanism that moves the stabilizer device to a contact position in which the stabilizer device contacts the workpiece from the side opposite to the side where the tool for machining the workpiece is positioned, with the workpiece in between, The anti-vibration device is positioned at the tip of the arm and includes a sliding mechanism that allows the anti-vibration device to slide toward the workpiece and toward the opposite side relative to the workpiece while in the contact position, The slide mechanism is positioned at the tip of the slide mechanism and the anti-vibration device has two rollers that contact the workpiece in the contact position, The aforementioned vibration damping device includes a biasing mechanism that biases the two rollers toward the workpiece in the contact position, A fixing mechanism for fixing the positions of the two rollers, Equipped with, The aforementioned machine tool is a multi-function machine tool including a turning center, The aforementioned moving mechanism is a swivel-type tool post of the machine tool, The tool post is rotatable about a rotation axis parallel to the central axis of the workpiece while the machine tool is supporting the workpiece, and the stabilizer is immobile in the direction in which the slide mechanism can slide while the tool post is rotatable and the stabilizer is in the contact position.

2. With the aforementioned bracing device in the contact position, the two rollers are each rotatable around a rotation axis that is arranged parallel to the central axis of the workpiece. The bracing device according to claim 1, wherein, in the contact position, when viewed from the radial direction of the workpiece, one of the two rollers contacts one region of the workpiece with respect to the central axis of the workpiece, and the other roller contacts the other region of the workpiece with respect to the central axis of the workpiece.

3. A vibration damping device according to claim 1 or 2, A machine tool having the aforementioned moving mechanism, A machine tool equipped with the following features.

Images