Rotation control device for oscillatory unit, and machine tool using the same

Abstract

To provide a rotation control device for an oscillatory unit that makes the oscillatory unit hard to vibrate in cutting work with the oscillator unit indexed to a predetermined angle.SOLUTION: The present invention relates to a rotation control device 100 for an oscillatory unit C that controls the angle of rotation of the oscillatory unit C, supporting a table T fitted with a workpiece on a first axis of rotation, and the rotation control device for the oscillatory unit comprises: a rotary shaft 1 which extends along the first axis A of rotation, and comprises a fitting end part 11 fitted with the oscillatory unit C; a rotary motor 2 which comprises a rotor 21 fixed to a side face part of the rotary shaft 1 and a stator 22 arranged outside the rotor 21 coaxially with the rotor; and a first brake mechanism 3 which is provided on the side of the fitting end part 11 about the rotary shaft 1 and acts on the side of the fitting end part 11 of the rotary shaft 1.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a rotational control device for a rocker that controls the rotational angle of the rocker around the first rotation axis that supports a table to which a workpiece is attached.

Background Art

[0002] For example, in order to reduce the number of setup changes or perform more flexible machining, a 5-axis machining center has been proposed that includes not only three linear axes but also two additional rotational axes in the drive mechanism. As shown in Patent Document 1, for example, a 5-axis machining center includes a spindle head configured to be movable in three linear axes in the X, Y, and Z directions, a rotary table to which a workpiece is attached and that is rotatable around the C axis, a rocker that supports the rotary table, and a rotational control device for the rocker that rotates the rocker around the A axis and controls the rotational angle thereof to a predetermined angle.

[0003] The rocker includes a flat support portion on which the rotary table is provided, and a pair of flat connecting portions that stand upright in parallel from each of both ends of the support portion. At least one of the connecting portions is fixed to an end portion of a rotary shaft of the rotational control device of the rocker.

[0004] The rotational control device for the rocker is configured such that the rotary shaft is driven by a direct drive motor, and performs indexing to maintain the rotational angle of the rocker fixed at a predetermined angle and synchronous control to change the rotational angle of the rocker in synchronization with the movement of the spindle head.

[0005] When performing indexing of the rotational angle of the rocker, for example, the rotation of the rotary shaft is fixed by a brake mechanism provided at an end portion of the rotary shaft on the side opposite to the side where it is connected to the rocker. The brake mechanism includes, for example, a brake disk provided at the end portion of the rotary shaft so as to spread radially outward, and a hydraulically driven piston that presses the brake disk against a predetermined pressing surface to exert a braking force.

[0006] By the way, when the rotating shaft is fixed by such a braking mechanism and machining is performed under severe machining conditions such as heavy cutting with the rocking angle of the rocker being determined, the rocker vibrates, and it may be difficult to achieve the required machining accuracy.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention has been made in view of the above-described problems, and an object thereof is to provide a rotation control device for a rocker that can make it difficult for the rocker to vibrate during cutting when the rocker is set at a predetermined angle.

Means for Solving the Problems

[0009] That is, a rotation control device for a rocker according to the present invention is a rotation control device for a rocker that controls the rotation angle of the rocker around a first rotation axis that supports a table to which a workpiece is attached, and includes a rotating shaft that extends along the first rotation axis and has an attachment end to which the rocker is attached, a rotor fixed to a side surface portion of the rotating shaft, and a stator disposed outside the rotor so as to be coaxial with the rotor, and a first braking mechanism provided on the attachment end side with reference to the rotating shaft and acting on the attachment end side of the rotating shaft.

[0010] If it is such a thing, since the first brake mechanism is configured to act on the mounting end portion side of the rotating shaft where the oscillator is mounted, the distance from the workpiece where the cutting load is generated to the first brake can be shortened, and the torsional rigidity of the entire rotation control device of the oscillator can be increased compared to the case where the brake is applied at a location far from the workpiece as in the conventional case. Therefore, the first brake mechanism can suppress the vibration of the oscillator or the workpiece even when, for example, heavy cutting is performed, and it becomes possible to improve the machining accuracy and machining efficiency.

[0011] As an arrangement of the first brake mechanism suitable for increasing the torsional rigidity as a whole, an example is that at least a part of the first brake mechanism is provided on the mounting end portion side rather than the stator.

[0012] In order to maintain the state where the rotation angle of the oscillator is divided into a desired angle and enable cutting to be performed in a state where high torsional rigidity is realized, the first brake mechanism may be configured to act in a state where the oscillator is divided into a predetermined angle.

[0013] In order to make the first brake mechanism compact while exerting a large braking force and facilitating an increase in torsional rigidity, the first brake mechanism is formed outside a brake shoe that comes into contact with and separates from the side surface portion of the rotating shaft and the brake shoe, and a first hydraulic chamber to which a hydraulic pressure for deforming the brake shoe toward the side surface portion of the rotating shaft is supplied. It may be any one having these components.

[0014] In order to make the area where the brake shoe acts on the rotating shaft as large as possible within a limited space and facilitate the exertion of braking force, at least a part of the brake shoe may be provided between the side surface portion of the rotating shaft and the stator.

[0015] In order to increase the braking torque by increasing the distance from the first rotating shaft to the point where the braking force of the first braking mechanism acts, on the side surface portion of the rotating shaft, the outer dimension of the portion facing the first braking mechanism may be formed larger than the portion where the rotor is fixed.

[0016] In order to increase the bending rigidity of the oscillator and the entire rotation control device, a first bearing is further provided on the mounting end portion side with reference to the rotating shaft, and the rotating shaft is rotatably supported. The first braking mechanism may be provided inside the first bearing when viewed along the first rotating shaft. Also, if it is such a structure, since the first bearing is provided closer to the oscillator side than the first braking mechanism, even if a failure occurs in the first bearing, replacement work and the like can be easily performed, and the maintainability can be improved.

[0017] In order to make the rotation control device of the oscillator itself compact while increasing the braking force by increasing the locations where the brake acts, it may be provided with a second braking mechanism acting on the opposite end portion on the opposite side of the mounting end portion with reference to the rotating shaft, and the second braking mechanism acting on the opposite end portion of the rotating shaft.

[0018] Furthermore, in order to prevent vibration even in cutting with a high machining load, the second braking mechanism may be configured to further act in a state where the first brake is acting.

[0019] To increase the braking torque by making the distance from the first rotating shaft to the point where the braking force of the second braking mechanism acts as large as possible, the second braking mechanism is attached to the opposite end of the rotating shaft, and includes a brake disk having a substantially annular or disk shape that expands outward from the rotating shaft, a piston that comes into contact with and separates from the plate surface of the brake disk, an operating state in which the piston sandwiches the brake disk between a predetermined pressing surface, an open state in which the piston is separated from the brake disk, and a second hydraulic chamber to which hydraulic pressure for switching by moving the piston is supplied. Any structure having these components is acceptable.

[0020] To support the rotating shaft at two points together with the first bearing, increase the bending rigidity of the entire oscillating device, and enable the overall outer dimensions along the first axial direction to be small even when the second braking mechanism is provided, a second bearing that is provided at the opposite end with reference to the rotating shaft and rotatably supports the rotating shaft is further provided, and at least a part of the second braking mechanism may be arranged side by side outward along the radial direction of the second bearing.

[0021] To facilitate power supply to the coil in the rotation control device of the oscillating device and quickly exhaust the heat generated by the coil, it is sufficient that the rotor is a permanent magnet, the stator is a coil, and a refrigerant supply space where refrigerant is supplied is formed on the outer side in the radial direction of the stator.

[0022] The machine tool according to the present invention is a machine tool including the oscillator, a rotation control device for a pair of the oscillators, and a spindle provided movably, wherein the oscillator includes a support portion that supports a table, and a pair of connection portions that connect between the support portion and the rotation control device of the oscillator, and one rotation control device of the oscillator is attached to each of the connection portions. With such a configuration, since the first brake mechanism can be disposed in the vicinity of each of the pair of connection portions of the oscillator, the torsional rigidity of the oscillator can be further increased. Therefore, with such a machine tool, machining with a high machining load such as heavy cutting can be suitably performed, for example.

[0023] If the table is configured to be rotatable about a second axis extending in a direction different from the first rotation axis, the workpiece fixed to the table can further take various postures, enhancing the flexibility of machining and reducing the number of setup changes. Further, if a fitting structure is formed between the rotating shaft and the attachment end portion and the connection portion of the oscillator, and the oscillator is fixed to the attachment end portion by the fitting structure, it is easy to firmly fix the oscillator to the rotating shaft and easy to increase the torsional rigidity.

Advantages of the Invention

[0024] Thus, in the rotation control device of the oscillator according to the present invention, since the first brake mechanism is configured to act on the attachment end portion side of the oscillator attached to the rotating shaft, the distance from the workpiece where the cutting load is generated to the first brake can be shortened, and the overall torsional rigidity can be made higher than before. Therefore, even if heavy cutting is performed on the workpiece, it is possible to less likely cause an event such as vibration leading to deterioration of machining accuracy.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0026] Hereinafter, a rotation control device 100 for an oscillator C according to a first embodiment of the present invention, and a machine tool 200 using the same will be described with reference to FIGS. 1 to 5.

[0027] As shown in FIG. 1, the machine tool 200 according to the first embodiment is configured such that a workpiece and a tool can move relative to three orthogonal axes in the X-axis direction, Y-axis direction, and Z-axis direction, and the posture of the workpiece can be changed by rotating around the A-axis, which is the first rotation axis A, and around the B-axis, which is the second rotation axis B. It is a five-axis machining center.

[0028] This machine tool 200 is configured as a horizontal machining center such that the tool faces the horizontal direction. Also, with the direction in which the tool faces being defined as the Z-axis, the moving direction of the tool orthogonal to the Z-axis in the horizontal direction is defined as the X-axis, and the moving direction of the tool orthogonal to the Z-axis in the vertical direction is defined as the Y-axis. Also, in the initial state, the first rotation axis A having an axis parallel to the X-axis is defined as the A-axis, and the second rotation axis B having an axis parallel to the Y-axis is defined as the B-axis.

[0029] Regarding the outline of each mechanism, the machine tool 200 of the first embodiment includes a bed BS extending in the Z-axis direction and a column CL standing upright in the Y-axis direction with respect to the bed BS.

[0030] On the bed BS, a pair of guide surfaces extending in the Z-axis direction are formed, and a first saddle SD1 for moving the workpiece in the Z-axis direction is provided on the guide surfaces. The first saddle SD1 is controlled by a Z-axis drive mechanism including a ball screw, a servo motor, etc. (not shown) to be in a predetermined position with respect to the Z-axis direction of the workpiece. On this first saddle SD1, an AB-axis unit 101 for rotating the workpiece around the A-axis and the B-axis is mounted. This AB-axis unit 101 includes a table T on which the workpiece is fixed and which is configured to be rotatable around the B-axis, a rocker C that supports the table T, and a pair of rotation control devices 100 that rotate the rocker C around the A-axis and control its rotation angle.

[0031] On the side surface of the column CL, a pair of guide surfaces extending in the X-axis direction are formed, and a second saddle SD2 is provided on the guide surfaces. The second saddle SD2 is controlled by an X-axis drive function including a ball screw, a servo motor, etc. (not shown) to be in a predetermined position with respect to the X-axis direction. The second saddle SD2 includes a Y-axis drive mechanism for driving the spindle head MS to which the tool is attached in the Z-axis direction and controlling it to a predetermined position.

[0032] Next, the details of the AB-axis unit 101 will be described with reference to FIGS. 1 and 2. The table T includes a B-axis rotation mechanism T1 provided on the rocker C side and a table plate T2 having a substantially square plate shape provided above the B-axis rotation mechanism T1. A workpiece is fixed on the table plate T2 using a predetermined jig or the like.

[0033] The oscillator C that supports the table T is a cradle-shaped member that is generally U-shaped in side view, and includes a flat support portion C1 that supports the table T and a pair of connection portions C2 that stand upright from both ends of the support portion C1. As shown in FIG. 2, the connection portion C2 is fixed to the rotation shaft 1 of the rotation control device 100 described later, for example, by bolts BL. When the rotation shaft 1 rotates, the posture of the oscillator C changes around the A axis. Note that FIG. 2 shows that the AB axis unit 101 has a substantially symmetric structure, and only the left half side is shown in a simplified manner for ease of viewing. Further, as shown in FIG. 3, a fitting structure M is formed between the mounting end portion 11 of the rotation shaft 1 and the connection portion C2 of the oscillator C. An engaging concave portion M1 formed in the connection portion C2 and an engaging convex portion M2 formed in the central portion of the mounting end portion 11 are fitted to each other, and the fixing of each member is realized by being supported. Along with the change in the posture of the oscillator C, the posture of the table T supported by the oscillator C and the workpiece fixed to the table T can also be changed around the A axis. That is, for the workpiece, the posture around the A axis can be changed by the oscillator C, and the posture around the B axis can be changed by the rotation of the table plate T2.

[0034] Next, the details of the rotation control device 100 will be described with reference to FIGS. 4 to 6. The rotation control device 100 determines the rotation angle of the rotation shaft 1 to which the connection portion C2 of the oscillator C is fixed by a so-called direct drive motor to a desired angle, or performs synchronous control to control the rotation angle of the rotation shaft 1 in synchronization with the movement of the spindle head MS. In the first embodiment, the rotation control device 100 is provided with one of the same devices at both ends of the oscillator C. In the following description, one rotation control device 100 will be focused on and described in detail.

[0035] As shown in FIG. 4, the rotation control device 100 includes a rotary shaft 1 that extends along the A-axis, which is the first rotation axis A, and has a mounting end portion 11 to which the oscillator C is attached, a rotor 21 fixed to the side surface portion of the rotary shaft 1, and a stator 22 disposed outside the rotor 21, and a rotation motor 2. Further, in the rotation control device 100, on the mounting end portion 11 side with respect to the rotary shaft 1, a first bearing BE1 and a first brake mechanism 3 are provided, and on the opposite end portion 12 side, which is opposite to the mounting end portion 11 side with respect to the rotary shaft 1, a second bearing BE2 and a second brake mechanism 4 are provided. Furthermore, outside the stator 22, the rotation control device 100 includes a body 5 that houses each member and a cooling mechanism 6 for dissipating heat generated in the rotation motor 2.

[0036] Details of each part of the rotation control device 100 will be described. As shown in FIG. 2, the rotation control device 100 has a substantially axisymmetric structure with respect to the A-axis. As shown in FIG. 4, the rotary shaft 1 has a substantially multi-stage cylindrical shape in which the outer dimensions increase as it advances along the A-axis from the opposite end portion 12 side to the mounting end portion 11 side. Both end portions are rotatably supported around the A-axis by the first bearing BE1 provided on the mounting end portion 11 side and the second bearing BE2 provided on the opposite end portion 12 side. Here, the first bearing BE1 and the second bearing BE2 are configured to be able to receive loads in both the thrust direction and the radial direction. Further, the rotary shaft 1 is hollow, and this hollow portion communicates with the internal cavity of the oscillator C and is used to pass power cables, hydraulic pipes, etc. from the support portion C1 of the oscillator C to the table T.

[0037] The rotation motor 2 is disposed at the central portion on the side surface portion of the rotary shaft 1. In the first embodiment, the rotor 21 is a permanent magnet annularly fixed to the side surface portion of the rotary shaft 1, and the stator 22 is a core and a coil provided outside the rotor 21 so as to face the permanent magnet. The rotation motor 2 is controlled so that the rotation angle of the rotary shaft 1 becomes a command angle set by the user based on the output of a rotor 21 encoder (not shown).

[0038] The first brake mechanism 3 acts to brake the rotation of the rotary shaft 1 around the A-axis and maintain the state in which, for example, the rotary shaft 1 is controlled and the rotation angle of the oscillator C is set to a predetermined angle. Here, the term "brake" includes not only completely stopping the rotation of the rotary shaft 1 but also generating a predetermined rotational resistance while rotating the rotary shaft 1 by the rotary motor 2. As shown in FIG. 2, the first brake mechanism 3 is disposed on the mounting end portion 11 side of the rotary shaft 1 and is disposed between the rotary motor 2 and the first bearing BE1. As shown in the enlarged view of FIG. 5, the first brake mechanism 3 includes a brake shoe 31 that comes into contact with and separates from the side surface portion of the rotary shaft 1, and a first hydraulic chamber 34 that is formed outside the brake shoe 31 and to which hydraulic pressure for deforming the brake shoe 31 toward the side surface portion of the rotary shaft 1 is supplied.

[0039] The brake shoe 31 is generally thin-walled cylindrical, and includes an ear portion 32 that extends radially outward of the rotary shaft 1, and an elastic deformation portion 33 that is a thin-walled portion extending along the axial direction of the rotary shaft 1 from the inner diameter side of the ear portion 32. An annular flange body 35 is provided with a gap from the outer peripheral portion of the elastic deformation portion 33, and the first hydraulic chamber 34 is formed in the gap. Specifically, O-rings 36 are disposed on the mounting end portion 11 side and the opposite side thereof between the flange 35 and the brake shoe 31 so that the aforementioned gaps are closed, and the first hydraulic chamber 34 is formed by the O-rings 36 being crushed. Here, the first hydraulic chamber 34 may be formed by various welding methods instead of the O-rings 36.

[0040] The flange body 35 has a larger thickness dimension than the elastic deformation part 33. When hydraulic pressure is supplied into the first hydraulic chamber 34, the elastic deformation part 33 of the brake shoe 31 deforms toward the rotary shaft 1 side and is pressed against the side surface part of the rotary shaft 1. That is, the first brake mechanism 3 is a hydraulically driven brake, and by directly pressing a part with a larger outer dimension in the rotary shaft 1 in the radial direction, braking force and braking torque due to frictional force are generated. Also, a part of the brake shoe 31 and the flange body 35 is configured to enter between the rotary shaft 1 and the stator 22. In this way, without increasing the size in the A-axis direction of the rotation control device 100, the area of the brake shoe 31 facing the rotary shaft 1 is made as large as possible to facilitate the exertion of braking force.

[0041] The second brake mechanism 4 is configured to further act when the first brake is acting. The second brake mechanism 4 is provided together with a second bearing BE2 at the opposite end part 12 of the rotary shaft 1, and the second brake mechanism 4 is arranged on the radially outer side of the second bearing BE2. More specifically, as shown in FIGS. 4 and 6, the second brake mechanism 4 is attached to the opposite end part 12 of the rotary shaft 1, and includes a brake disk 41 having a substantially annular or disk shape that spreads toward the outside of the rotary shaft 1, a piston 42 that comes into contact with and separates from the plate surface part of the brake disk 41, an operating state in which the piston 42 sandwiches the brake disk 41 between a predetermined pressing surface, an open state in which the piston 42 is separated from the brake disk 41, and a second hydraulic chamber 43 to which hydraulic pressure for switching by moving the piston 42 is supplied.

[0042] The piston 42 is configured to always press the brake disk 41 against the pressing surface 44 by a spring 45. When hydraulic pressure is supplied to the second hydraulic chamber 43, the spring 45 is compressed and the piston 42 is in a state of being separated from the brake disk 41.

[0043] With each rotation control device 100 of the oscillator C of the first embodiment configured as described above, since the first brake mechanism 3 is provided on the mounting end portion 11 side of the rotary shaft 1 to which the connection portion C2 of the oscillator C is fixed, the distance between the two braking points acting in the rotational direction around the A-axis as the entire AB-axis unit 101 can be made shorter than before. Therefore, the torsional rigidity of the AB-axis unit 101 around the A-axis in a state where the braking force is applied by each first brake mechanism 3 can be made higher than before. Therefore, even if machining with a high machining load such as heavy cutting is performed in a state where the rotational angle of the workpiece around the A-axis is divided into a predetermined angle, it is possible to prevent torsional vibration from occurring in the AB-axis unit 101.

[0044] Furthermore, since the first brake mechanism 3 directly presses a portion with a large outer dimension on the rotary shaft 1 by hydraulic pressure with the brake shoe 31 and directly generates frictional force on the rotary shaft 1 to perform braking, it is easy to generate a large braking force or braking torque. Also, since the braking force is generated by the second brake mechanism 4 in addition to the state where the braking force is generated by the first brake mechanism 3, the rotary shaft 1 can be made even more difficult to rotate. These also contribute to the improvement of the torsional rigidity of the AB-axis unit 101 during the braking action.

[0045] The first bearing BE1 is provided on the side of the mounting end portion 11 rather than the first brake mechanism 3, and the weights of the oscillator C, the table T, and the workpiece are supported by the respective first bearings BE1. Therefore, the bending rigidity of the AB-axis unit 101 can also be increased, and the amount of deformation in the vertical direction can be made as small as possible.

[0046] Also, the rotation control device 100 of the oscillator C of the first embodiment can increase the torsional rigidity and bending rigidity of the AB-axis unit 101 while making the axial dimension compact.

[0047] Other embodiments will be described. As shown in FIG. 7, in the AB-axis unit 101 according to the second embodiment of the present invention, regarding the fitting structure M, at the mounting end portion 11 of the rotating shaft 1, a fitting shaft protruding toward the oscillator C side is defined as an engaging convex portion M1, and a fitting hole formed in the connecting portion C2 of the oscillator C is defined as an engaging concave portion M2, and the rotating shaft 1 and the connecting portion C2 may be fixed to each other. For example, the fitting shaft may be fixed by a bolt BL or the like in the radial direction while being inserted into the fitting hole.

[0048] In the first embodiment, it was a horizontal machining center, but the oscillator rotation control device according to the present invention may be used in a vertical machining center. The oscillator is not limited to being supported at both ends by a pair of rotation control devices, and the oscillator may be supported only at one end by a rotation control device. Further, even when the oscillator is supported at both ends, the rotation angle of one side may be controlled by a rotation control device, and the other side may be in a state of being rotatably supported only by a bearing or the like without providing a rotation control device.

[0049] The first brake mechanism is not limited to the configuration described in the first embodiment. For example, a brake disk may be used in the same manner as the second brake mechanism, or an electromagnetic brake or the like may be used. The same applies to the second brake mechanism. In addition, the second brake mechanism may be omitted and only the first brake may be provided on the mounting end portion side of the rotating shaft.

[0050] In the first embodiment, the first bearing was arranged closer to the mounting end portion side than the first brake mechanism, but the first brake mechanism may be arranged closer to the mounting end portion side than the first bearing.

[0051] The first rotating shaft and the second rotating shaft are not limited to the A-axis and the B-axis respectively, and may be other rotating shafts defined in a machine tool. That is, the names such as the A-axis, the B-axis, and the C-axis can be appropriately changed according to the orientation of the tool of the machine tool.

[0052] The table may not have a rotation function. That is, even if it is for performing four-axis machining, the rotation control device for the oscillator according to the present invention can also be used. In addition, the rotation control device for the oscillator according to the present invention may be applied not only to a machine tool that performs only removal machining, but also to a machine tool that can perform additional machining.

[0053] In addition, as long as it does not conflict with the gist of the present invention, various modifications of the embodiments and combinations of parts of each embodiment may be made.

Explanation of Signs

[0054] 200 ··· Machine tool 100 ··· Rotation control device 101 ··· AB-axis unit 1 ··· Rotation shaft 11 ··· Mounting end 12 ··· Opposite end 2 ··· Rotation motor 21 ··· Rotor 22 ··· Stator 3 ··· First brake mechanism 31 ··· Brake shoe 34 ··· First hydraulic chamber 4 ··· Second brake mechanism 41 ··· Brake disk 42 ··· Piston 43 ··· Second hydraulic chamber 44 ··· Pressing surface C ··· Oscillator T ··· Table A ··· A-axis (first rotation axis) B ··· B-axis (second rotation axis)

Claims

1. A rotational control device for a swing device that controls the rotational angle around a first rotation axis of the swing device that supports a table to which a workpiece is attached, comprising: a rotary shaft that extends along the first rotation axis and has a mounting end to which the swing device is attached; a rotary motor including a rotor fixed to a side surface portion of the rotary shaft and a stator disposed outside the rotor so as to be coaxial with the rotor; a first braking mechanism provided on the mounting end side with reference to the rotary shaft and acting on the mounting end side of the rotary shaft, wherein the rotational control device for the swing device is characterized by comprising the first braking mechanism.

2. The rotational control device for a swing device according to claim 1, wherein at least a part of the first braking mechanism is provided on the mounting end side with respect to the stator.

3. The rotational control device for a swing device according to claim 1, wherein the first braking mechanism is configured to act when the swing device is set at a predetermined angle.

4. The first braking mechanism includes: a brake shoe that comes into contact with and separates from a side surface portion of the rotary shaft; and a first hydraulic chamber formed outside the brake shoe and supplied with hydraulic pressure for deforming the brake shoe toward the side surface portion of the rotary shaft, wherein the rotational control device for the swing device according to claim 1 is characterized by comprising the first hydraulic chamber.

5. The rotational control device for a swing device according to claim 4, wherein at least a part of the brake shoe is provided between the side surface portion of the rotary shaft and the stator.

6. The rotational control device for a swing device according to claim 1, wherein, on the side surface portion of the rotary shaft, an outer dimension of a portion facing the first braking mechanism is formed to be larger than that of a portion where the rotor is fixed.

7. The rotational control device for a swing device according to claim 1, further comprising a first bearing provided on the mounting end side with reference to the rotary shaft and rotatably supporting the rotary shaft, wherein the first braking mechanism is provided inside the first bearing when viewed along the first rotation axis.

8. The rotational control device for a swing device according to claim 1, further comprising a second braking mechanism provided at an opposite end portion on the side opposite to the mounting end portion with reference to the rotary shaft and acting on the opposite end portion of the rotary shaft.

9. The rotation control device for an oscillator according to claim 8, wherein the second brake mechanism is configured to further act in a state where the first brake mechanism is acting.

10. The second brake mechanism is attached to the opposite end portion of the rotary shaft, and includes a brake disk having a substantially annular or disk shape that extends outward toward the outside of the rotary shaft, a piston that contacts and separates from the plate surface portion of the brake disk, and a second hydraulic chamber to which hydraulic pressure for switching between an operating state in which the piston sandwiches the brake disk between a predetermined pressing surface and an open state in which the piston is separated from the brake disk is supplied. The rotation control device for an oscillator according to claim 8.

11. is provided at the opposite end portion with reference to the rotary shaft, and further includes a second bearing that rotatably supports the rotary shaft, and at least a part of the second brake mechanism is arranged side by side outward along the radial direction of the second bearing. The rotation control device for an oscillator according to claim 8.

12. The rotor is a permanent magnet, the stator is a coil, and a refrigerant supply space for supplying refrigerant is formed outside the stator in the radial direction. The rotation control device for an oscillator according to claim 1.

13. An industrial machine comprising the oscillator, a pair of rotation control devices for the oscillator, and a main shaft provided movably, wherein the oscillator includes a support portion that supports a table, and a pair of connection portions that connect between the support portion and the rotation control device of the oscillator, and the rotation control device of the oscillator is attached to each of the connection portions one by one. The industrial machine according to any one of claims 1 to 12.

14. The industrial machine according to claim 13, wherein the table is configured to be rotatable about a second axis extending in a direction different from the first rotation axis.

15. A fitting structure is formed between the rotary shaft and the attachment end portion and the connection portion of the oscillator, and the oscillator is fixed to the attachment end portion by the fitting structure. The industrial machine according to claim 13.

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