Processing device and processing method for ring-shaped member, manufacturing method for bearing, manufacturing method for mechanical device, and manufacturing method for vehicle

Abstract

Provided are a rotation drive mechanism (2) that rotates a metal annular member (5) in a circumferential direction around a reference axis; a grinding mechanism (40) that has a grinding wheel (3) pressed against an outer circumferential surface of the annular member (5); and a support mechanism (4) that supports the annular member (5). The support mechanism (4) has a support portion (42) that contacts an inner circumferential surface of the annular member (5) in at least one circumferential range around the reference axis.

Description

Technical Field

[0001] This disclosure relates to a processing apparatus for machining the outer peripheral surface of a metal annular component. This application claims priority based on Japanese Patent Application No. 2023-195436, filed on November 16, 2023, the contents of which are incorporated herein by reference. Background Technology

[0002] For the outer peripheral surfaces of metal annular components that constitute the inner ring raceway of the inner ring and the outer peripheral surface of the outer ring of a radial rolling bearing, grinding is performed to improve surface accuracy and surface roughness.

[0003] Figure 13 The conventional grinding apparatus 100 described in Patent Document 1 (Japanese Patent Application Publication No. 2004-195651) is shown. The grinding apparatus 100 includes: a pad 101 that can be rotated around its own central axis; a grinding wheel 102 that has a central axis arranged parallel to the central axis of the pad 101 and can be rotated around the central axis; and two shoes 104 for radially positioning a metal annular member 103 that serves as a workpiece (workpiece).

[0004] When grinding the outer peripheral surface of the annular component 103, the axial end face of the annular component 103 is magnetically attracted to the end face of the pad 101, and the ends (seat surfaces) of the two slip shoes 104 are made to slide in contact with the outer peripheral surface of the annular component 103, thereby achieving radial positioning of the annular component 103.

[0005] In this state, by rotating the pad 101, the annular member 103 is rotated, and the grinding surface 105 of the rotating grinding wheel 102, which is the outer peripheral surface, is pressed against the portion of the outer peripheral surface of the annular member 103 that moves circumferentially away from the portion where the ends of the two slip shoes 104 slide in contact, thereby grinding the outer peripheral surface of the annular member 103.

[0006] In the conventional grinding apparatus 100 described in Patent Document 1, when grinding the outer peripheral surface of the annular member 103, the grinding surface 105 of the grinding wheel 102 is pressed against the outer peripheral surface of the annular member 103. Therefore, as Figure 14 As exaggerated in the illustration, the annular component 103 elastically deforms into an ellipse with the pressing direction of the grinding surface 105 of the grinding wheel 102 as its minor axis. In particular, recently, the raceway rings of rolling bearings designed to meet the requirements of lightweighting and miniaturization are made of thin walls and have very low stiffness. Therefore, when the raceway ring is ground as an annular component on its outer peripheral surface, such elastic deformation is easily generated.

[0007] If the annular component 103 elastically deforms into an elliptical shape as described above, that is, elastically deforms in such a way that the outer peripheral surface of the annular component 103 separates from the grinding surface 105 of the grinding wheel 102, then there is a possibility that the grinding amount of the outer peripheral surface of the annular component 103 is inconsistent with the cutting depth of the grinding wheel 102, making it difficult to process the outer peripheral surface of the annular component 103 into the desired radial dimension.

[0008] Patent document 2 (Japanese Patent Application Publication No. 2019-42864) describes a grinding device that uses two slippers to support a portion of the outer peripheral surface of an annular member that moves circumferentially away from the portion being ground by the grinding wheel. When the outer peripheral surface of the annular member is ground by the grinding wheel, a torque is applied to the annular member in the direction of pressing the outer peripheral surface of the annular member toward the first slipper, which is closer to the grinding wheel.

[0009] Specifically, the second slide shoe, located on the side furthest from the grinding wheel, is supported to allow it to oscillate around an axis further away from the first slide shoe than the circumferential center of the second slide shoe. Therefore, as the grinding wheel is pressed against the outer circumferential surface of the annular component, the reaction force exerted on the annular component from the second slide shoe is greater on the side furthest from the first slide shoe than on the side closer to the first slide shoe at the contact point between the annular component and the second slide shoe. As a result, a torque is applied to the annular component in the direction that presses its outer circumferential surface toward the first slide shoe.

[0010] According to the grinding apparatus described in Patent Document 2, even when the annular component is elastically deformed into an elliptical shape due to the grinding surface of the grinding wheel being pressed against the outer circumferential surface of the annular component, the contact pressure between the first slip shoe and the outer circumferential surface of the annular component can be effectively prevented from decreasing, thereby stabilizing the posture of the annular component during the grinding process. Existing technical documents Patent documents

[0011] Patent Document 1: Japanese Patent Application Publication No. 2004-195651 Patent Document 2: Japanese Patent Application Publication No. 2019-42864 Summary of the Invention

[0012] In the grinding apparatus described in Patent Document 2, since the outer circumferential surface of the annular component is supported by two slippers, it is difficult to prevent the annular component from elastically deforming into an elliptical shape due to the pressing pressure of the grinding wheel.

[0013] Therefore, there is a possibility that the grinding amount of the outer peripheral surface of the annular component is inconsistent with the depth of cut of the grinding wheel, making it difficult to machine the outer peripheral surface of the annular component to the desired radial dimension.

[0014] The purpose of this invention is to provide a processing apparatus and method for ring-shaped components that are beneficial to improving quality.

[0015] In one embodiment of the invention, the processing apparatus for the annular component comprises: a rotary drive mechanism that rotates the metal annular component in a circumferential direction about a reference axis; a grinding mechanism having a grinding wheel pressed against the outer circumferential surface of the annular component; and a support mechanism having a support portion that contacts the inner circumferential surface of the annular component in at least one circumferential range about the reference axis, thereby supporting the annular component.

[0016] In one aspect of the invention, the method for processing a ring-shaped component includes: a step of rotating a metal ring-shaped component in a circumferential direction about a reference axis; and a step of pressing a grinding wheel against the outer circumferential surface of the ring-shaped component, the step including a step of supporting the ring-shaped component by contacting a support portion with the inner circumferential surface of the ring-shaped component in at least one circumferential range about the reference axis.

[0017] In one aspect of the present invention, the method for manufacturing a bearing including an annular component includes a step of machining the outer peripheral surface of the annular component using the annular component machining method described above.

[0018] In one aspect of the present invention, a method for manufacturing a mechanical device includes: a step of manufacturing a mechanical component using the bearing manufacturing method described above; and a step of installing the mechanical component onto the main body of the device.

[0019] In one aspect of the present invention, a vehicle manufacturing method includes: a step of manufacturing a bearing using the bearing manufacturing method described above; and a step of installing the bearing onto the vehicle body. Invention Effects

[0020] According to the present invention, a processing apparatus and processing method for annular components that are beneficial to quality improvement can be provided. Attached Figure Description

[0021] Figure 1 This is a side view schematically showing the processing apparatus for the annular component according to the first embodiment. Figure 2 It is a diagram schematically representing the support structure. Figure 3 It is a cross-sectional view of a mechanical device that includes rolling bearings. Figure 4 This is a partial sectional perspective view of a rolling bearing. Figure 5 This is a schematic cross-sectional view showing a bearing with a coating. Figure 6 This is a diagram schematically showing an example of a support portion (support member) arranged relative to the outer ring. Figure 7 This is a side view schematically showing the processing apparatus for the annular component according to the second embodiment. Figure 8 This is a side view schematically showing the processing apparatus for the annular component according to the third embodiment. Figure 9 This is a side view schematically showing the processing apparatus for the annular component according to the fourth embodiment. Figure 10 This is a side view schematically showing the processing apparatus for the annular component according to the fifth embodiment. Figure 11 This is a side view schematically showing the processing apparatus for the annular component according to the sixth embodiment. Figure 12 This is a side view schematically showing the processing apparatus for the annular component according to the seventh embodiment. Figure 13 This is a side view schematically illustrating an example of a conventional construction of a processing device for a ring-shaped component. Figure 14 It is an exaggerated representation of the state in which a ring-shaped component elastically deforms into an elliptical shape. Detailed Implementation

[0022] [First Embodiment] use Figures 1-6 The first embodiment will be described.

[0023] In this embodiment, the processing apparatus 1 for the annular component includes a rotary drive mechanism 2, a grinding mechanism 40, and a support mechanism 4. In one example, the processing apparatus 1 is a grinding apparatus for performing grinding operations. In other examples, the processing apparatus 1 can be configured as an ultra-precision machining apparatus for performing ultra-precision machining.

[0024] The rotary drive mechanism 2 can move the metal annular component 5, which serves as the workpiece, in a predetermined direction α. Figure 1 The rotational drive mechanism 2 enables the annular component 5 to rotate circumferentially about the reference axis (Oa).

[0025] In one example, the rotary drive mechanism 2 has a holding member 6 for holding the annular member 5 and a drive unit 36. For instance, the rotary drive mechanism 2 has a pad (holding member, plate member) 6, which drives the annular member 5 to rotate while the axial end face of the annular member 5 is magnetically attracted to the pad 6. The pad 6 holds the annular member 5 by magnetic attraction. The drive unit 36 ​​rotates the annular member 5 via the pad (holding member) 6. In other examples, the holding member 6 may have a different construction than the pad.

[0026] The pad 6 is capable of rotational drive centered on a central axis (reference axis, rotation axis) Oa. In one example, the central axis Oa of the pad 6 is along the horizontal direction ( Figure 1 (The orientation of the paper face to the back face). In other examples, the central axis of the pad can also be configured in an orientation different from the horizontal direction.

[0027] For example, pad 6 has an end face containing a flat surface orthogonal to the central axis Oa (facing... Figure 1 The paper surface near the front end face, the retaining surface). The pad 6 magnetically adsorbs the axial end face of the annular component 5 (towards) on the end face. Figure 1 The inner end face of the paper and the end face of the shaft can support the annular component 5 coaxially with itself.

[0028] The grinding mechanism 40 has a grinding wheel 3 and a drive unit 37. The grinding wheel 3 can be pressed against the outer peripheral surface 5a of the annular member 5 in order to perform grinding processing on the outer peripheral surface 5a of the annular member 5.

[0029] In one example, the grinding wheel 3 is rotated by the drive unit 37. The grinding wheel 3 is a rotating grinding wheel that has a grinding surface 7 on its outer peripheral surface and is capable of rotating around a central axis (rotation axis) Ob arranged parallel to the central axis Oa of the pad 6. The grinding surface 7 has a generatrix shape that matches the generatrix shape of the outer peripheral surface 5a of the annular member 5, which is the surface being ground. For example, the grinding wheel 3 can rotate in the opposite direction β ( ) of the predetermined direction α around the central axis Ob. Figure 1 The grinding wheel 3 is driven to rotate counterclockwise, and its outer circumferential surface (grinding surface 7) rotates faster than the outer circumferential surface 5a of the annular component 5. In other examples, the rotation direction and speed of the grinding wheel 3, as well as the rotation direction and speed of the annular component 5, can be arbitrarily set.

[0030] The grinding wheel 3 can move the central axis Ob relative to the central axis Oa of the pad 6, that is, in Figure 1 It can move in the left and right direction. That is, it can press the grinding surface 7 of the grinding wheel 3 against the outer peripheral surface 5a of the annular component 5 supported on the pad 6.

[0031] Alternatively, the grinding mechanism 40 can be configured such that the grinding wheel 3 does not rotate substantially. That is, when performing grinding or other machining on the outer peripheral surface 5a of the annular member 5, the annular member 5 can be rotated without rotating the grinding wheel. In the case that the machining device is an ultra-precision machining device, when performing ultra-precision machining on the outer peripheral surface 5a of the annular member 5, the annular member 5 can be rotated without rotating the grinding wheel, allowing it to oscillate.

[0032] The support mechanism 4 has a support portion 42 that contacts the inner circumferential surface 5b of the annular member 5 in at least one circumferential range (W11, W21) around the reference axis (Oa). The support portion 42 has inner diameter side support members 8a, 8b that contact the inner circumferential surface 5b of the annular member 5 and support the annular member 5 radially. Additionally, it is possible to have an outer diameter side support member that contacts the outer circumferential surface 5a of the annular member 5 and supports the annular member 5 radially. Figure 1 In the example, the support portion 42 has inner diameter side support members 8a and 8b, but no outer diameter side support member.

[0033] exist Figure 1 In one example, the support portion 42 has two inner diameter side support members 8a and 8b. In other examples, the support portion 42 may have one or more inner diameter side support members.

[0034] exist Figure 1 In the example, support members 8a and 8b are arranged separately from each other in the circumferential direction. Support members 8a and 8b have seat surfaces (end surface, support surface, contact surface) 9a and 9b that contact and support the inner circumferential surface 5b of the annular member 5. At least a portion of the seat surfaces 9a and 9b have a curved shape corresponding to the curved shape of the inner circumferential surface 5b of the annular member 5. During grinding, when the annular member 5 rotates, the support portion 42 (support members 8a and 8b) does not move substantially in the circumferential direction, and the circumferential positions (positions about the reference axis Oa) of the support members 8a and 8b are fixed. The inner circumferential surface 5b of the annular member 5 moves relative to the support portion 42 (seat surfaces 9a and 9b of the support members 8a and 8b) in the circumferential direction. The seat surfaces 9a and 9b slide in contact with the inner circumferential surface 5b of the annular member 5.

[0035] For example, the two inner diameter side support components 8a and 8b have slippers that slide in contact with the inner circumferential surface 5b of the annular component 5. The slippers can be made of hard and wear-resistant materials such as superhard alloys, ceramics, and diamond.

[0036] exist Figure 1 In the example, two inner diameter side support components 8a and 8b are supported and fixed to a support platform (frame, shell) that constitutes the support mechanism 4 (not shown).

[0037] exist Figure 2In the example, the retaining member (pad) 6 for holding the annular member 5 is mounted on the frame 50. Additionally, the support members 8a and 8b, which contact the inner circumferential surface 5b of the annular member 5, are also mounted on the frame 50. That is, the retaining member 6 and the support members 8a (8b) are mounted on a common frame 50. The retaining member 6 is supported on the frame 50 in a manner that allows it to rotate freely about the reference axis Oa. The support members 8a (8b) are supported on the frame 50 via an adjustment mechanism 51. The adjustment mechanism 51 can adjust the position (position of the seat surface 9a (9b) in the plane intersecting the reference axis Oa) and / or posture of the support members 8a (8b) relative to the reference axis Oa. For example, the adjustment mechanism 51 has a linear movement mechanism and / or an eccentric mechanism. The retaining member 6 and the support members 8a (8b) are positioned relative to the common reference axis Oa. This structure facilitates simplified adjustment operations and improves positional accuracy.

[0038] exist Figure 2 In the example, the two axial ends of the support member 8a (8b) (the first shaft end and the second shaft end opposite to the first shaft end) are supported by the frame 50. Figure 2 (a) of the frame 50). The two-sided support structure helps to ensure high rigidity. The support members 8a (8b) can be attached and detached relative to the frame 50. In other examples, one axial end of the support member 8a (8b) is supported by the frame 50. Figure 2 (b) and (c) parts). The single-sided support structure facilitates the assembly and disassembly of the ring-shaped component 5. For example, in the single-sided support structure, the support component 8a (8b) is supported on the same side as the support holding component 6. Figure 2 (b) of the structure. This configuration is conducive to saving space. Alternatively, for example, the support member 8a (8b) is supported on the side opposite to the support holding member 6. This configuration facilitates the adjustment of the support member 8a (8b).

[0039] In one example, multiple support members 8a and 8b are held on a housing 53 equipped with an adjustment mechanism 51. The housing 53 holding the multiple support members 8a and 8b is mounted on a frame 50. The multiple support members 8a and 8b are simultaneously installed or simultaneously removed from the frame 50 via the housing 53. Additionally, the housing 53 can be configured to be axially segmented. For example, the housing 53 has a first part and a second part, which can be axially combined with each other. The first part of the housing 53 supports the first axial end of the support member 8a (8b), and the second part of the housing 53 supports the second axial end of the support member 8a (8b). The segmented structure facilitates high rigidity and ease of assembly and disassembly.

[0040] return Figure 1Each inner diameter-side support member 8a, 8b has an end surface (seat surface, support surface, contact surface) 9a, 9b that slides in contact with the inner circumferential surface 5b of the annular member 5. In one example, each end surface 9a, 9b is formed by a partially cylindrical surface that curves along the inner circumferential surface 5b of the annular member 5. Furthermore, the radius of curvature of each end surface 9a, 9b is substantially the same as the radius of curvature of the inner circumferential surface 5b of the annular member 5. That is, each end surface 9a, 9b is in surface contact with the inner circumferential surface 5b of the annular member 5. In other examples, the end portion (seat surface) of the inner diameter-side support member 8a (8b) serving as a slipper can also be in line contact or point contact with the inner circumferential surface 5b of the annular member 5.

[0041] The circumferential positions of the seat surfaces 9a and 9b of the support components 8a and 8b are set according to the grinding position, etc. Figure 1 In the example, the circumferential range (W11) of the support range of the first support member 8a includes the circumferential position corresponding to the contact position (back position) between the grinding wheel 3 and the annular member 5.

[0042] The support position (P1) of the first support member 8a in the inner circumferential surface 5b and the contact position (P10) between the grinding wheel 3 and the annular member 5 in the outer circumferential surface 5a are arranged on or near a straight line (L1) extending radially along the annular member 5. Furthermore, the support position (P1) and the contact position (P10) are substantially in a face-to-back position relative to each other, separated by the wall of the annular member 5. The first support member 8a bears a radially inward force from the grinding wheel 3 acting on the outer circumferential surface 5a of the annular member 5 on its inner circumferential surface 5b, inside the annular member 5. The annular member 5 is supported by the support portion 42 at or near a circumferential position substantially the same as the circumferential position where the pressing force of the grinding wheel 3 is applied. This suppresses changes in the shape of the annular member 5 during the grinding process.

[0043] In addition, Figure 1 In the example, the circumferential range (W21) of the support range of the second support member 8b includes a circumferential position located on the vertical line passing through the reference axis (Oa) and above the reference axis (Oa). In other examples, multiple support members 8a, 8b can be configured in other ways. Furthermore, in the support portion 42, only one support member can be configured to contact the inner circumferential surface 5b of the annular member 5.

[0044] Regarding the circumferential center positions P1 and P2 of the portions of two adjacent inner diameter side support members 8a and 8b along the circumference of the annular member 5 that contact the inner circumferential surface 5b of the annular member 5, they can be arranged apart from each other by a distance δ1, denoted by a central angle with the central axis Oa of the annular member 5 as the center. In other words, the angle formed by an imaginary straight line La connecting the circumferential center position P1 of the portion of one inner diameter side support member 8a that contacts the inner circumferential surface 5b of the annular member 5 (i.e., the end surface 9a) to the central axis Oa of the annular member 5, and another imaginary straight line Lb connecting the circumferential center position P2 of the portion of the other inner diameter side support member 8b that contacts the inner circumferential surface 5b of the annular member 5 (i.e., the end surface 9b) to the central axis Oa of the annular member 5, can be set as δ1. The inner diameter side support member 8a has a first support range (first contact range) W11 and a second support range (second contact range) W21. The angle (central angle about the reference axis) δ1 between the circumferential center position of the first support range W11 and the circumferential center position of the second support range W21 is appropriately set. For example, δ1 can be set to 20° to 160°, 75° to 105°, or 75° to 90°. Figure 1 In the example, δ1 is 90°. The above value is an example and is not limited to this.

[0045] In one example, the circumferential position and shape of an inner diameter-side support member 8a are restricted such that, when viewed axially from the annular member 5, at least a portion of the end face 9a of an inner diameter-side support member 8a that contacts the inner circumferential surface 5b of the annular member 5 exists within a first circumferential direction range W1, with a first imaginary straight line L1 as a reference. The first imaginary straight line L1 is an imaginary straight line connecting the central axis Oa of the annular member 5 to the central axis Ob of the grinding wheel 3. The first circumferential direction range W1 is a range with a central angle of ±θ1 centered on the central axis Oa of the annular member 5. The support member 8a has a region (seat surface (support surface, contact surface) 9a) capable of contacting the inner circumferential surface 5b of the annular member 5, and the circumferential range (central angle) W1 corresponding to this region (circumferential length of the seat surface 9a) is appropriately set. For example, θ1 is 45°, 22.5°, or 15°. For example, θ1 can be set to approximately 60°, 55°, 50°, 45°, 40°, 35°, 30°, 25°, 20°, 15°, 10°, or 5°. The above values ​​are examples and are not limited to these.

[0046] In one example, the circumferential position of an inner diameter side support member 8a and the shape of its end face 9a are restricted such that the portion of the end face 9a of an inner diameter side support member 8a that contacts the inner circumferential surface 5b of the annular member 5 is entirely within the first circumferential direction range W1.

[0047] For example, if the rotation direction α of the annular component 5 is set to positive, the angle between the first imaginary line L1 and an imaginary line La can be set to -22.5° to +22.5° or -15° to +15°. Figure 1 In the example, the angle between the first imaginary line L1 and an imaginary line La is 0°, and the circumferential center position P1 of the end face 9a of an inner diameter side support component 8a is located on the first imaginary line L1.

[0048] In other examples, only a portion of the inner diameter-side support member 8a is allowed to contact the inner circumferential surface 5b of the annular member 5 within the first circumferential direction range W1. And / or, the circumferential central position P1 can be configured at a circumferential position different from the first imaginary straight line L1.

[0049] In one example, the circumferential position and shape of another inner diameter-side support member 8b are restricted such that, when viewed from the axial direction of the annular member 5, at least a portion of the end face 9b of the other inner diameter-side support member 8b that contacts the inner circumferential surface 5b of the annular member 5 exists within a second circumferential direction range W2, with reference to a second imaginary line L2. This second imaginary line L2 extends from the central axis Oa of the annular member 5 in a direction offset by 90° relative to the first imaginary line L1 in the opposite direction β to the rotational direction α of the annular member 5. The second circumferential direction range W2 is a range with a central angle of ±θ2 centered on the central axis Oa of the annular member 5. The support member 8b has a region (seat surface (support surface, contact surface) 9b) capable of contacting the inner circumferential surface 5b of the annular member 5, and the circumferential range (central angle) W2 corresponding to this region (circumferential length of the seat surface 9b) is appropriately set. For example, θ2 is 45° or 22.5°. For example, θ2 can be set to approximately 60°, 55°, 50°, 45°, 40°, 35°, 30°, 25°, 20°, 15°, 10°, or 5°. The above values ​​are examples and are not limited to these.

[0050] In other examples, when grinding the outer peripheral surface of the annular component 5, if the grinding wheel 3 rotates in the same direction as the rotation direction of the annular component, the second imaginary line L2 can be set as a straight line extending from the central axis of the annular component in a direction offset by 90° from the first imaginary line L1 in the rotation direction of the annular component 5.

[0051] In one example, the circumferential position and the shape of the end face 9b of another inner diameter side support member 8b are restricted such that the portion of the end face 9b of the other inner diameter side support member 8b that contacts the inner circumferential surface 5b of the annular member 5 is entirely present in the second circumferential direction range W2.

[0052] For example, if the rotation direction α of the annular component 5 is set to positive, the angle between the second imaginary line L2 and another imaginary line Lb can be set to -45° to +45°, 0° to +45°, or 0° to +15°. Figure 1 In the example, the angle between the second imaginary line L2 and another imaginary line Lb is 0°, and the circumferential center position P2 of the end face 9a of the other inner diameter side support component 8a is located on the second imaginary line L2.

[0053] In other examples, only a portion of the inner diameter-side support member 8b is in contact with the inner circumferential surface 5b of the annular member 5 within the second circumferential direction range W2. And / or, the circumferential central position P2 can be configured at a circumferential position different from the second imaginary straight line L2.

[0054] In the first embodiment, when the outer peripheral surface 5a of the annular component 5 is ground using the processing apparatus 1, the axial end face of the annular component 5 is held on the pad 6 by magnetic adsorption. The pad 6 rotates in a predetermined direction α. ​​The annular component 5 rotates in the predetermined direction α about its central axis Oa. Figure 1 As shown, the end faces 9a and 9b of the two inner diameter side support members 8a and 8b are in sliding contact with the inner circumferential surface 5b of the annular member 5. The annular member 5 is supported radially by the two inner diameter side support members 8a and 8b.

[0055] The grinding wheel 3 rotates about its central axis Ob in the opposite direction β to the specified direction α. ​​For example, the circumferential speed of the grinding surface 7 is faster than the circumferential speed of the outer circumferential surface 5a of the annular component 5. The grinding surface 7 is pressed against the outer circumferential surface 5a of the annular component 5, and grinding is performed on the outer circumferential surface 5a.

[0056] As needed, a specified fluid, such as coolant, is supplied during the grinding process. For example, the inner diameter side support members (two inner diameter side support members 8a and 8b) constituting the support mechanism 4 can be equipped with coolant supply holes with openings. Coolant sprayed from the openings of the coolant supply holes is supplied to the contact portion between the outer peripheral surface 5a of the annular member 5 and the grinding surface 7 of the grinding wheel 3.

[0057] In this embodiment, when grinding the outer peripheral surface 5a of the annular member 5, the inner peripheral surface 5b of the annular member 5 is supported by the inner diameter side support members (two inner diameter side support members 8a and 8b) of the support mechanism 4. Therefore, changes in the shape of the annular member 5 are suppressed during the grinding process. The stiffness relative to the machining force applied to the outer peripheral surface 5a of the annular member 5 from the grinding surface 7 of the grinding wheel 3 is improved compared to the conventional method.

[0058] In this embodiment, compared with the prior art where the outer peripheral surface 5a of the annular member 5 is ground while being supported by a slipper, the situation where the outer peripheral surface 5a elastically deforms into an elliptical shape by detaching from the grinding surface 7 of the grinding wheel 3 during grinding is suppressed. For example, it is easy to make the grinding amount of the outer peripheral surface 5a of the annular member 5 approximately the same as the depth of cut of the grinding wheel 3, thereby machining the outer peripheral surface 5a of the annular member 5 to the desired radial dimension. In addition, it is easy to make the radial wall thickness of the annular member 5 nearly uniform in the circumferential direction.

[0059] In one example, the circumferential center positions P1 and P2 of the portions of two adjacent inner diameter-side support members 8a and 8b along the circumference of the annular member 5 that contact the inner circumferential surface 5b of the annular member 5 are arranged apart from each other by δ1, denoted by a central angle centered on the central axis Oa of the annular member 5. This can efficiently improve the stiffness of the annular member 5 relative to the case where the annular member 5 elastically deforms in the radial direction due to the machining force applied to the outer circumferential surface 5a of the annular member 5 from the grinding surface 7 of the grinding wheel 3.

[0060] In one example, at least a portion of the inner diameter side support member (two inner diameter side support members 8a, 8b) constituting the support mechanism 4 that contacts the inner circumferential surface 5b of the annular member 5 exists within the first circumferential direction range W1. Specifically, at least a portion (in this example, the entire end face 9a of one inner diameter side support member 8a) exists within the first circumferential direction range W1. Therefore, at the contact portion between the outer circumferential surface 5a of the annular member 5 and the grinding surface 7 of the grinding wheel 3, the machining force in the normal direction applied to the outer circumferential surface 5a of the annular member 5 can be efficiently supported by the end face 9a of one inner diameter side support member 8a existing within the first circumferential direction range W1. Figure 1 The pressing force of the grinding wheel 3 acting to the left (Fn). Therefore, from this point of view, it is also possible to effectively prevent the annular component 5 from elastically deforming into an elliptical shape.

[0061] In one example, at least a portion of the inner diameter side support member (two inner diameter side support members 8a, 8b) constituting the support mechanism 4, which contacts the inner circumferential surface 5b of the annular member 5, exists within the second circumferential direction range W2. Specifically, at least a portion (in this example, the entire end face 9b of the other inner diameter side support member 8b) exists within the second circumferential direction range W2. Therefore, at the contact portion between the outer circumferential surface 5a of the annular member 5 and the grinding surface 7 of the grinding wheel 3, the machining force applied to the outer circumferential surface 5a of the annular member 5 can be efficiently supported by the end face 9b of the other inner diameter side support member 8b existing within the second circumferential direction range W2. Figure 1 The downward grinding force Ft. Therefore, it can effectively prevent the annular component 5 from grinding in the aforementioned tangential direction ( Figure 1The outer peripheral surface 5a of the annular component 5 is ground stably by displacing it in the downward direction.

[0062] In this embodiment, the inner circumferential surface 5b of the annular component 5 is supported by the inner diameter-side support members (two inner diameter-side support members 8a and 8b) constituting the support mechanism 4, and the outer circumferential surface 5a of the annular component 5 is ground. Therefore, scratches (slipper damage) on the outer circumferential surface of the annular component 5 are prevented. The appearance of the annular component 5 remains good, or damage to the coating applied to the outer circumferential surface 5a of the annular component 5 is prevented.

[0063] Figure 3 An electric motor 10 is shown, which includes a bearing comprising an annular component processed by the grinding method described above.

[0064] The electric motor 10 includes a housing 11, an output shaft 12, two bearings 13a and 13b, a motor stator 14, and a motor rotor 15.

[0065] It should be noted that, regarding electric motor 10, the axial side is... Figure 3 On the right side, the other side of the axis is Figure 3 On the left side.

[0066] The housing 11 has a bottomed cylindrical housing body 16 with an end opening only on one axial side and a hollow circular plate-shaped cover 17 mounted on the open end on one axial side of the housing body 16.

[0067] The output shaft 12 is coaxially disposed inside the housing 11. The axial end of the output shaft 12 protrudes outward from the housing 11 through the radially inner side of the cover 17.

[0068] Two bearings 13a and 13b rotatably support the output shaft 12 relative to the housing 11. Specifically, one bearing 13a rotatably supports the axially inclined end portion of the output shaft 12 relative to the cover 17. The other bearing 13b rotatably supports the axially inclined end of the output shaft 12 relative to a retaining recess 19 located at the center of the axially inclined side of the bottom 18 of the housing body 16.

[0069] The two bearings 13a and 13b are respectively made by Figure 4 The radial deep groove ball bearing is configured as shown. The radial deep groove ball bearing includes an inner ring 20, an outer ring 21, multiple balls 22 which are rolling elements, and a cage 23.

[0070] The inner ring 20 has an inner ring raceway 24 with an arc-shaped cross-section on its outer circumferential surface. The outer ring 21 has an outer ring raceway 25 with an arc-shaped cross-section on its inner circumferential surface. A plurality of balls 22 are freely arranged and rolled between the inner ring raceway 24 and the outer ring raceway 25 while being held by the cage 23.

[0071] The inner circumferential surface of the inner ring 20 constituting one bearing 13a is interference-fitted to the outer circumferential surface of the portion near the end on one axial side of the output shaft 12. The outer circumferential surface of the outer ring 21 constituting one bearing 13a is interference-fitted to the inner circumferential surface of the cover 17. The inner circumferential surface of the inner ring 20 constituting another bearing 13b is interference-fitted to the outer circumferential surface of the end on the other axial side of the output shaft 12. The outer circumferential surface of the outer ring 21 constituting another bearing 13b is interference-fitted to the inner circumferential surface of the retaining recess 19.

[0072] The motor stator 14 is cylindrical in shape and is embedded and fixed to the inner circumferential surface of the housing body 16.

[0073] The motor rotor 15 is cylindrical in shape and is fixed to the output shaft 12 on the radial inner side of the motor stator 14.

[0074] In the electric motor 10, when the motor stator 14 is energized, an electromagnetic force is generated that causes the motor rotor 15 to rotate relative to the motor stator 14, and the output shaft 12 rotates together with the motor rotor 15.

[0075] In manufacturing the inner ring 20 and the outer ring 21, a forging process is performed on a billet made of hard metal such as medium carbon steel or bearing steel to obtain an intermediate body with the general shape of each component (inner ring 20 or outer ring 21). Then, each intermediate body is subjected to cutting processing for shaping, heat treatment for imparting the required hardness and other mechanical properties, and finishing processing for completing the final shape and surface roughness.

[0076] In one example, the grinding method using the processing apparatus 1 can be used as an annular blank for grinding the outer circumferential surface of the annular blank as described above for finishing. In this application, when grinding the outer circumferential surface of the inner ring 20, at least the inner ring raceway 24 can be ground.

[0077] In other examples, the grinding method using the processing device 1 for the annular component is not limited to grinding the outer peripheral surfaces of the inner ring 20 and outer ring 21 of the bearings 13a and 13b constituting the electric motor 10, but can be used to grind the outer peripheral surfaces of various annular components, such as the raceway rings constituting bearings assembled in various mechanical devices and automobiles.

[0078] In one case, Figure 3and Figure 4 The bearings 13a and 13b shown can have a coating on the surface of the inner ring 20 or the outer ring 21. For example, the coating adds functions such as wear resistance, corrosion resistance, adhesion resistance, antimagnetism, mold release properties, and / or insulation to the bearings 13a and 13b. For example, the coating can be made of a material that is substantially the same as or different from the material of the main body of the inner ring 20 or the outer ring 21. Various materials such as resin materials, metal materials, and ceramics can be used for the coating. Bearings equipped with coatings are not limited to... Figure 3 and Figure 4 The bearing shown is of a certain shape. Furthermore, bearings with a coating are not limited to electric motors and can be used in a wide variety of devices.

[0079] In one example, such as Figure 5 As shown, at least the outer peripheral surface of the outer ring (annular component) 21 is covered by a coating 121. For example, the outer peripheral surface covered by the coating 121 (the coated surface (the coating 121 on the outer peripheral surface)) is machined using a grinding apparatus. Figure 13 In the grinding apparatus 100 shown, the outer peripheral surface of an annular component (e.g., outer ring) 103 is supported by a slipper 104. In this case, during grinding of the coated surface, scratches and damage (e.g., scratches on the slipper 104, damage caused by abrasive particles entering between the slipper 140 and the annular component 103) may occur on the coating film on the outer peripheral surface. On the other hand, in Figure 1 In the grinding apparatus 1 shown, the inner peripheral surface 5b of the annular member 5 is supported by the support portion 42, thus preventing the support portion 42 from contacting the outer peripheral surface 5a of the annular member 5 during grinding of the coated surface. As a result, the generation of scratches and damage, as well as the reduction of coating function, are suppressed.

[0080] For example, the processing method for the annular component 5 includes: a metal surface grinding step that grinds the outer peripheral surface and / or the inner peripheral surface of the annular component 5; a coating film forming step that forms a coating film on the outer peripheral surface of the annular component 5 after the metal surface grinding step; and a coating surface grinding step that grinds the outer peripheral surface (coating surface) on which the coating film has been formed. Through the metal surface grinding step, the radial thickness (wall thickness) of the annular component 5 is made uniform. Even if the coating film formed in the coating film forming step is uneven, the coating surface grinding step makes the film thickness uniform. Furthermore, during the grinding of the coating surface, the inner peripheral surface of the annular component 5 is supported, thereby preventing scratches and damage that accompany the support of the coating surface.

[0081] In one example, before the coating process on the annular component 5, both the outer and inner circumferential surfaces of the annular component 5 are machined using a grinding device. For example, the outer circumferential surface is ground first, and then the inner circumferential surface is ground. Further, a coating is formed on the outer circumferential surface of the annular component 5, and then the outer circumferential surface covered by the coating (the coating or coated surface on the outer circumferential surface) is machined using a grinding device.

[0082] For example, in the grinding of the outer peripheral surface before the coating process, the outer or inner peripheral surface of the annular component is supported by a slipper. Additionally, in the grinding of the inner peripheral surface before the coating process, the outer peripheral surface of the annular component is supported by slippers (outer slipper, outer diameter slipper, outer support portion).

[0083] In the grinding of the inner circumferential surface of the annular component 5, a grinding wheel is positioned on the inner side (inner diameter side) of the annular component 5, and a slipper (outer slipper) is positioned on the outer side. For example, the support position of the outer slipper and the contact position between the grinding wheel on the inner circumferential surface and the annular component 5 are positioned on or near a straight line extending radially along the annular component 5. That is, the support position of the outer slipper and the contact position between the grinding wheel on the inner circumferential surface and the annular component are substantially in a face-to-back position relative to each other, separated by the wall of the annular component 5. The outer slipper is positioned at the opposite position (outer side) of the grinding position where grinding is performed by the grinding wheel positioned on the inner diameter side of the annular component 5. The outer slipper bears the radially outward force from the grinding wheel acting on the inner circumferential surface of the annular component 5 on its outer circumferential surface (back side). The annular component 5 is supported by the slipper (support) at or near a circumferential position substantially the same as the circumferential position where the pressing force of the grinding wheel is applied. Therefore, changes in the shape of the annular component 5 are suppressed during the grinding process. Furthermore, the inner circumferential surface of the annular component 5 is ground using the outer circumferential surface, after its roundness has been adjusted by grinding, as a reference. This improves both the roundness of the outer and inner diameters of the annular component 5.

[0084] Furthermore, during the grinding of the inner circumferential surface of the annular component 5, the radial thickness of the annular component 5 is controlled. For example, the position of the grinding wheel is controlled based on the position corresponding to the surface (seat surface) of the outer slipper (support portion) that abuts against the outer circumferential surface of the annular component 5, thereby forming an annular component 5 with a uniform and specified radial thickness over the entire circumference.

[0085] Then, a coating film is formed on the outer peripheral surface of the annular component 5, and grinding is performed on the coated surface where the coating film is formed. For example, in Figure 1In the grinding apparatus 1 shown, the coating surface (outer peripheral surface 5a) is ground while the inner peripheral surface 5b of the annular member 5 is supported by the support portion 42. The grinding process of the coating surface includes: a process of rotating the annular member 5 in the circumferential direction about a reference axis; and a process of pressing the grinding wheel 3 onto the coating surface (outer peripheral surface 5a on which the coating film is formed) of the annular member 5, in which the support portion 42 is brought into contact with the inner peripheral surface of the annular member 5 in at least one circumferential range about the reference axis to support the annular member 5. During the grinding of the coating surface, the support portion 42 is positioned on the inner diameter side of the annular member 5. During the grinding of the coating surface, contact between the support portion 42 and the outer peripheral surface 5a of the annular member 5 is avoided. Therefore, the generation of scratches and damage, as well as the reduction of coating function, are suppressed. In addition, by grinding the coating surface, the thickness of the coating film is made uniform throughout the entire circumference. A uniform coating film is beneficial for obtaining high film function and high film effect.

[0086] In other examples, the inner circumferential surface of the annular component 5 can be ground first, followed by the outer circumferential surface, during the grinding process before the coating step. Alternatively, either the inner or outer circumferential surface of the annular component 5 can be ground during the grinding process before the coating step.

[0087] For example, before the process of coating the annular component with a film, the outer peripheral surface of the annular component is machined by a grinding device. Figure 1 In the grinding apparatus 1 shown, the inner circumferential surface 5b of the annular member 5 is supported by a support portion 42. During the machining of the outer circumferential surface 5a of the annular member 5, the radial thickness of the annular member 5 is controlled. For example, using the position corresponding to the surface (seat surface) of the support portion 42 abutting the inner circumferential surface 5b of the annular member 5 as a reference, the position of the grinding wheel 3 is controlled to form an annular member 5 with a uniform, predetermined radial thickness over the entire circumference. Then, a coating is formed on the outer circumferential surface 5a of the annular member 5. Further, grinding processing is performed on the coating to achieve uniform coating thickness over the entire circumference. A uniform coating is beneficial for high film function and high film effect.

[0088] In one example, the seat surface of the support portion 42 (seat surfaces 9a and 9b of the support components 8a and 8b) that abuts against the inner peripheral surface 5b of the annular component 5 has a uniform planar shape without substantial unevenness. In other examples, the seat surface of the support portion 42 has unevenness, curvature, corners, and / or layering. For example, the seat surface of the support portion 42 has a shape corresponding to at least a portion of the unevenness, curvature, corners, and / or layering on the inner peripheral surface 5b of the annular component 5. A seat surface of the support portion 42 having a shape that at least partially matches the shape of the inner peripheral surface 5b is beneficial for improving support stability, grinding accuracy, and / or product quality.

[0089] Figure 6An example of the seat surface 9a (9b) of the support member 8a (8b) disposed relative to the outer ring 21 is shown. Figure 6 In the example shown in part (a), the seat surface 9a (9b) of the support member 8a (8b) has a surface shape (e.g., a planar shape) that corresponds to the inner circumferential surface of the outer ring 21, which is different from the raceway surface 25. The seat surface 9a (9b) contacts the inner circumferential surface of the outer ring 21 that is located radially inward relative to the raceway surface 25, but does not contact the raceway surface 25.

[0090] exist Figure 6 In the example shown in part (b), the seat surface 9a (9b) (or the profile of the seat surface) has a curvature shape (curvature, curved surface) 45 corresponding to the curvature in the raceway surface 25 (or the profile of the raceway surface) of the outer ring 21. For example, the seat surface 9a (9b) has a curvature 45 that at least partially matches the curvature of the raceway surface 25. At least a portion of the seat surface 9a (9b) of the support member 8a (8b) is capable of contacting the raceway surface 25 of the outer ring 21.

[0091] exist Figure 6 In the example shown in part (c), the seat surface 9a (9b) (or the profile of the seat surface) has a curved shape (bend, curved surface) 45 corresponding to the bend in the raceway surface 25 (or the profile of the raceway surface) of the outer ring 21, and surface shapes (e.g., planar shapes) 46a, 46b corresponding to the inner circumferential surface different from the raceway surface 25. For example, the seat surface 9a (9b) has a bend 45 that at least partially matches the bend of the raceway surface 25. In addition, the seat surface 9a (9b) has surface shapes (e.g., planar shapes) 46a, 46b corresponding to the inner circumferential surface of the outer ring 21 that is different from the raceway surface 25. At least a portion of the seat surface 9a (9b) of the support member 8a (8b) is capable of contacting the raceway surface 25 of the outer ring 21 and / or a surface different from the raceway surface 25.

[0092] exist Figure 6In the example shown in part (d), the seat surface 9a (9b) (or the profile of the seat surface) has a curved shape (bend, curved surface) 45a, 45b corresponding to the bend in the raceway surface 25 (or the profile of the raceway surface) of the outer ring 21, and a surface shape (e.g., a planar shape) 46a, 46b corresponding to an inner circumferential surface different from the raceway surface 25. The curved surface 45a and the surface 46a form a corner (inner corner) 47a. The curved surface 45b and the surface 46b form a corner (inner corner) 47b. The corners 47a and 47b are axially separated from each other. The corner 47a has a shape corresponding to the corner (outer corner) 61a on the inner circumferential surface side of the outer ring 21. The corner 47a and the corner 61b at least partially match. The corner 47b has a shape corresponding to the corner (outer corner) 61b on the inner circumferential surface side of the outer ring 21. Corner 47b and corner 61b are at least partially matched. At least a portion of the seat surface 9a (9b) of the support member 8a (8b) is capable of contacting the raceway surface 25 of the outer ring 21 and / or a surface different from the raceway surface 25.

[0093] In one example, the support portion 42 has at least a portion of a surface that contacts the raceway surface 25 of the outer ring 21. The raceway surface 25 of the outer ring 21 is supported by the seat surface 45 of the support portion 42 (seat surfaces 9a, 9b of the support members 8a, 8b). During the machining of the outer peripheral surface of the outer ring 21 or the outer peripheral surface containing the coating, the radial thickness (groove bottom wall thickness) of the outer ring 21 can be controlled. For example, in a grinding apparatus, the position of the grinding wheel is controlled based on the position corresponding to the seat surface of the support portion 42 abutting the raceway surface 25 of the outer ring 21, forming an outer ring 21 with a uniform and predetermined radial thickness over the entire circumference. If necessary, additional heat treatment is performed on the outer ring 21, followed by turning or grinding of the inner peripheral surface of the outer ring 21.

[0094] The coating treatment and / or seat surface shape described above can be applied to a variety of methods, including the embodiments described later. In one example, the support portion 42, which contacts the inner circumferential surface of the annular member, has a rotatable roller. The outer circumferential surface (seat surface) of the roller has a shape corresponding to at least a portion of the irregularities, bends, corners, and / or layer differences on the inner circumferential surface of the annular member. The annular member has a first inner circumferential surface and a second inner circumferential surface, at least a portion of which has a depth relative to the first inner circumferential surface. The support portion 42 is configured to contact the second inner circumferential surface. For example, in a grinding apparatus, the roller of the support portion 42 abuts against the raceway surface 25 of the outer ring 21, and the roller makes rolling contact with the raceway surface 25. This helps to suppress scratches and damage in the raceway surface 25.

[0095] [Second Embodiment] use Figure 7 The second embodiment will be described.

[0096] In the second embodiment, the support portion 42 of the support mechanism 4a has a support member 8c. The support mechanism 4a has a support portion 42 that contacts the inner circumferential surface 5b of the annular member 5 within a circumferential range (W31) around the reference axis (Oa). In the second embodiment, the number of components constituting the support mechanism 4a is reduced. In one example, the inner diameter side support member 8c constituting the support mechanism 4a has a slipper.

[0097] Regarding the circumferential width of the portion (seat surface (support surface, contact surface) 9c) of an inner diameter side support member 8c that contacts the inner circumferential surface 5b of the annular member 5, it is set to δ2 when expressed as the central angle centered on the central axis Oa of the annular member 5. For example, δ2 can be set to 20° or more and 90° or less, 30° or more and 90° or less, 45° or more and 180° or less, or 75° or more and 90° or less. For example, δ2 can be approximately 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175°, or 180°. Figure 7 In the example, δ2 is 90°. The above value is an example and is not limited to this.

[0098] In one example, the inner diameter side support member 8c has a fan-shaped end face with a central angle of δ2 (90°) when viewed from the axial direction. That is, the end face (seat surface) 9c of the inner diameter side support member 8c is formed by a local cylindrical surface with a central angle of δ2 (90°), and its radius of curvature is substantially the same as the radius of curvature of the inner circumferential surface 5b of the annular member 5. In other words, the entire end face 9c of the inner diameter side support member 8c is in sliding contact with the inner circumferential surface 5b of the annular member 5.

[0099] exist Figure 7 In the example, because the circumferential width (central angle δ2) of the portion of the inner diameter-side support member 8c that contacts the inner circumferential surface 5b of the annular member 5 is set sufficiently wide, the inner circumferential surface 5b of the annular member 5 can be stably supported. In other examples, the contact width of the inner diameter-side support member 8c is set relatively narrow, as in the support member 8a of the first embodiment.

[0100] In the second embodiment, although there is only one support member 8c, the support position (Pf) and the contact position (P10) are substantially in a face-to-back position relationship, separated by the wall of the annular member 5. The support member 8c bears a radially inward force from the grinding wheel 3 acting on the outer peripheral surface 5a of the annular member 5 on its inner circumferential surface 5b inside the annular member 5. The annular member 5 is supported by the support portion 42 at or near the circumferential position where the pressing force of the grinding wheel 3 is applied. This suppresses changes in the shape of the annular member 5 during the grinding process.

[0101] exist Figure 7 In the example, the front end of the annular member 5 in the rotation direction α of the end face 9c of the inner diameter side support member 8c exists in the first circumferential direction range W1.

[0102] In one example, the front edge Pf of the annular member 5 in the rotational direction α of the end face 9c of the inner diameter side support member 8c is positioned at the same circumferential position as the first imaginary straight line L1. Alternatively, the end edge Pf is positioned on the front side of the annular member 5 in the rotational direction α compared to the first imaginary straight line L1. Figure 7 In the example, the end edge Pf is positioned at the same circumferential position as the first imaginary line L1.

[0103] exist Figure 7 In the second circumferential direction range W2, the rear end of the annular member 5 in the rotation direction α of the end face 9c of the inner diameter side support member 8c exists in the rotation direction α of the annular member 5.

[0104] In one example, the rear edge Pr of the annular member 5 in the rotation direction α of the end face 9c of the inner diameter side support member 8c is positioned at the same circumferential position as the second imaginary straight line L2.

[0105] The other structures and effects are the same as in the first embodiment.

[0106] [Third Implementation] use Figure 8 The third embodiment will be described.

[0107] In the processing apparatus 1b of the third embodiment, the support mechanism 4b has elastic members (force-applying members) 26a and 26b that elastically apply force to the inner circumferential surface 5b of the annular member 5 on each inner diameter side support member 8a and 8b.

[0108] In one example, each inner diameter-side support member 8a, 8b is supported relative to a support platform (not shown) constituting the support mechanism 4b, allowing for radial displacement of the annular member 5. Furthermore, each inner diameter-side support member 8a, 8b is elastically stressed toward the inner circumferential surface 5b of the annular member 5 via elastic members 26a, 26b assembled between itself and the support platform.

[0109] For example, each of the elastic components 26a and 26b can be made of a coil spring. Alternatively, the elastic components 26a and 26b can be made of various elastic components such as leaf springs and disc springs. Furthermore, the slippers (slipper plates) of the inner diameter side support components 8a and 8b can also be made of elastomers such as rubber and resin.

[0110] In the third embodiment, the applied force based on the elasticity generated by each elastic member 26a, 26b can be adjusted. This prevents the pressing pressure of the grinding surface 7 of the grinding wheel 3 relative to the outer peripheral surface 5a of the annular member 5 from becoming excessive. It also more effectively prevents the annular member 5 from elastically deforming into an elliptical shape. Alternatively, it prevents the contact pressure of the end faces 9a, 9b of each inner diameter side support member 8a, 8b relative to the inner peripheral surface 5b of the annular member 5 from becoming excessive. This effectively prevents circumferential scratches (slipper damage) from occurring on the inner peripheral surface 5b.

[0111] The other structures and effects are the same as in the first embodiment.

[0112] [Fourth Embodiment] use Figure 9 The fourth embodiment will be described.

[0113] In the processing apparatus 1c of the fourth embodiment, the two inner diameter side support members 8d and 8e in the support mechanism 4c have support rollers that are in rolling contact with the inner circumferential surface 5b of the annular member 5, respectively.

[0114] In one example, each inner diameter side support member 8d, 8e has a cylindrical outer peripheral surface 27a, 27b, which is arranged parallel to the central axis of the annular member 5 and is rotatably supported on a support platform (not shown) that constitutes the support mechanism 4c.

[0115] In one example, a portion of the outer circumferential surface 27a of an inner diameter side support member 8d that contacts the inner circumferential surface 5b of the annular member 5 exists within the first circumferential direction range W1.

[0116] In one example, the circumferential central position P1 of the portion of the outer circumferential surface 27a of an inner diameter side support member 8d that contacts the inner circumferential surface 5b of the annular member 5 is positioned at the same circumferential position as the first imaginary straight line L1.

[0117] In one example, the portion of the outer circumferential surface 27b of another inner diameter side support member 8e that contacts the inner circumferential surface 5b of the annular member 5 exists in the second circumferential direction range W2.

[0118] In one example, the circumferential central position P2 of the portion of the outer peripheral surface 27b of another inner diameter side support member 8e that contacts the inner peripheral surface 5b of the annular member 5 is positioned at the same circumferential position as the second imaginary straight line L2.

[0119] In the third embodiment, since the outer peripheral surfaces 27a and 27b of each inner diameter side support member 8d and 8e are in rolling contact with the inner peripheral surface 5b of the annular member 5, circumferential scratches on the inner peripheral surface 5b can be prevented.

[0120] The other structures and effects are the same as in the first embodiment.

[0121] [Fifth Embodiment] use Figure 10 The fifth embodiment will be described.

[0122] In the processing apparatus 1d of the fifth embodiment, the rotary drive mechanism 2a replaces the pad and has a drive roller 28, which has an outer peripheral surface 29 that engages with the inner peripheral surface 5b of the annular member 5.

[0123] In one example, the drive roller 28 has a cylindrical outer peripheral surface 29. For instance, the central axis of the drive roller 28 is arranged parallel to the central axis Oa of the annular component 5. The drive roller 28 is driven to rotate around its own central axis.

[0124] In one example, when grinding the outer peripheral surface 5a of the annular component 5, the drive roller 28 is positioned radially inside the annular component 5 in a circumferential position that does not interfere with the two inner diameter side support components 8a, 8b. Furthermore, the outer peripheral surface 29 of the drive roller 28 engages frictionally with the inner peripheral surface 5b of the annular component 5. In this state, the annular component 5 rotates due to the rotational drive of the drive roller 28.

[0125] In the fifth embodiment, when the outer peripheral surface 5a of the annular member 5 is ground, the drive roller 28, which is in frictional engagement with the inner peripheral surface 5b of the annular member 5, rotates, thereby causing the annular member 5 to rotate. Therefore, even if the radial wall thickness of the annular member 5 is small, making it difficult for the axial end face of the annular member 5 to be magnetically attracted to the pad, the annular member 5 will rotate stably.

[0126] The other structures and effects are the same as in the first embodiment.

[0127] [Sixth Implementation] use Figure 11 The sixth embodiment will be described.

[0128] In the processing apparatus 1e of the sixth embodiment, when grinding the outer peripheral surface 5a of the annular member 5, the drive roller 28 is positioned radially outside the annular member 5 at a circumferential position that does not interfere with the grinding wheel 3. Furthermore, the outer peripheral surface 29 of the drive roller 28 engages with the outer peripheral surface 5a of the annular member 5 through friction. In this state, the annular member 5 rotates due to the rotational drive of the drive roller 28.

[0129] Therefore, in the sixth embodiment, even if the radial wall thickness of the annular member 5 is small and it is difficult to magnetically adsorb the pad on the axial end face of the annular member 5, the annular member 5 will rotate stably.

[0130] The other structures and effects are the same as in the fifth embodiment.

[0131] [Seventh Embodiment] use Figure 12 The seventh embodiment will be described.

[0132] In the processing apparatus 1f of the seventh embodiment, the support mechanism 4d further includes an outer diameter side support member 30 that contacts the outer peripheral surface 5a of the annular member 5 and supports the annular member 5 radially. The support mechanism 4d has a support portion 42 that contacts the inner peripheral surface 5b of the annular member 5 in at least one circumferential range (W11) around the reference axis (Oa) and contacts the outer peripheral surface 5a of the annular member 5 in at least another circumferential range (W71).

[0133] In one example, the support mechanism 4d has one outer diameter-side support member 30. In other examples, the support mechanism 4d can have multiple outer diameter-side support members.

[0134] exist Figure 12 In the example, in relation to Figure 1 In comparison to the example, the support mechanism 4d, in addition to having an inner diameter side support member 8a, also has an outer diameter side support member 30, replacing the inner diameter side support member 8b.

[0135] In one example, the outer diameter-side support member 30 has a slipper. In other examples, the outer diameter-side support member 30 can have Figure 9 Like the support rollers in the example.

[0136] exist Figure 12In this example, the support member 30 has a seat surface (end surface, support surface, contact surface) 31 that contacts and supports the outer peripheral surface 5a of the annular member 5. At least a portion of the seat surface 31 has a curved shape corresponding to the curved shape of the outer peripheral surface 5a of the annular member 5. During grinding, when the annular member 5 rotates, the support portion 42 (support member 8a, support member 30) does not move substantially in the circumferential direction, and the circumferential positions of the support members 8a and 30 are fixed. The inner peripheral surface 5b or the outer peripheral surface 5a of the annular member 5 moves relative to the support portion 42 (seat surface 9a of the support member 8a, seat surface 31 of the support member 30) in the circumferential direction. The seat surface 9a slides in contact with the inner peripheral surface 5b of the annular member 5, and the seat surface 31 slides in contact with the outer peripheral surface 5a.

[0137] In one example, the outer diameter side support member 30 is supported and fixed to a support platform (not shown) constituting the support mechanism 4d. The outer diameter side support member 30 has an end surface (seat surface, support surface, contact surface) 31 that slides in contact with the outer peripheral surface 5a of the annular member 5. The end surface 31 is formed by a partially cylindrical surface that curves along the outer peripheral surface 5a of the annular member 5. In addition, the radius of curvature of the end surface 31 is substantially the same as the radius of curvature of the outer peripheral surface 5a of the annular member 5. That is, the end surface 31 is in surface contact with the outer peripheral surface 5a of the annular member 5. In other examples, the end portion (seat surface) of the outer diameter side support member 30, which serves as a slipper, can also be in line contact or point contact with the outer peripheral surface 5a of the annular member 5.

[0138] Regarding the circumferential central position P1 of the portion of the inner diameter side support member 8a that contacts the inner circumferential surface 5b of the annular member 5, and the circumferential central position Q of the portion of the outer diameter side support member 30 that contacts the outer circumferential surface 5a of the annular member 5, they can be arranged apart from each other by δ3, taking the central angle centered on the central axis Oa of the annular member 5 as the center. In other words, the angle formed by an imaginary straight line La connecting the circumferential central position P1 to the central axis Oa of the annular member 5 and another imaginary straight line Lc connecting the circumferential central position Q to the central axis Oa of the annular member 5 can be set as δ3. δ3 can be set, for example, to be 20° to 160° or less, 75° to 105° or less, or 90° to 105° or less. For example, δ3 is approximately 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175°, or 180°. Figure 12 In the example, δ3 is 90°. The above value is an example and is not limited to this.

[0139] In one example, the circumferential position and shape of the outer diameter-side support member 30 are restricted such that, when viewed from the axial direction of the annular member 5, at least a portion of the end face 31 of the outer diameter-side support member 30, which contacts the outer circumferential surface 5a of the annular member 5, exists within a third circumferential direction range W3, with a reference to a third imaginary straight line L3. The third imaginary straight line L3 extends from the central axis Oa of the annular member 5 in a direction offset by 90° relative to the first imaginary straight line L1 towards the rotational direction α of the annular member 5. The third circumferential direction range W3 is a range with a central angle of ±θ3 centered on the central axis Oa of the annular member 5. For example, θ3 can be set to 45° or 22.5°. For example, θ3 can be set to approximately 60°, 55°, 50°, 45°, 40°, 35°, 30°, 25°, 20°, 15°, 10°, or 5°. The above values ​​are examples and are not limited thereto.

[0140] In other examples, when grinding the outer peripheral surface 5a of the annular component 5, if the grinding wheel 3 rotates in the same direction as the rotation direction of the annular component 5, the third imaginary line L3 can be set as a straight line extending from the central axis of the annular component 5 in a direction offset by 90° relative to the first imaginary line L1 in the opposite direction to the rotation direction of the annular component 5.

[0141] In one example, the circumferential position of the outer diameter side support member 30 and the shape of the end face 31 are restricted such that the portion of the end face 31 of the outer diameter side support member 30 that contacts the outer peripheral surface 5a of the annular member 5 exists entirely within the third circumferential direction range W3.

[0142] For example, if the rotation direction α of the annular component 5 is set to positive, the angle between the third imaginary line L3 and another imaginary line Lc can be set to -45° to +45°, 0° to +45°, or 0° to +15°. Figure 12 In the example, the angle between the third imaginary line L3 and another imaginary line Lc is set to 0°, so that the circumferential center position Q of the end face 31 of the outer diameter side support member 30 is located on the third imaginary line L3.

[0143] During the grinding of the outer peripheral surface 5a of the annular component 5, a tangential machining force is applied to the outer peripheral surface 5a of the annular component 5 at the contact point between the outer peripheral surface 5a of the annular component 5 and the grinding surface 7 of the grinding wheel 3. Figure 12 The downward grinding force Ft. Therefore, if the outer diameter of the outer peripheral surface 5a decreases as the grinding of the outer peripheral surface 5a of the annular component 5 proceeds, the direction in which the end face of the annular component 5 relative to the pad 6 approaches the outer diameter side support component 30 follows the decrease in outer diameter. Figure 12(below) the. Thus, the end face 31 of the outer diameter side support member 30 is maintained in a proper sliding contact state with respect to the outer peripheral surface 5a of the annular member 5.

[0144] Additionally, regarding the processing apparatus, a mechanism can be provided such that, as the processing of the outer peripheral surface 5a of the annular member 5 proceeds, the outer diameter of the outer peripheral surface 5a decreases, and this mechanism moves the outer diameter-side support member 30 in a manner close to the outer peripheral surface of the annular member. For example, the support mechanism 4d can be structured with an elastic member (force-applying member) that elastically applies force to the outer diameter-side support member 30 toward the outer peripheral surface 5a of the annular member 5.

[0145] The other structures and effects are the same as in the first embodiment.

[0146] This disclosure allows for the appropriate combination and implementation of the above-described embodiments without creating contradictions.

[0147] In one embodiment, the processing apparatus for the annular component includes: a rotary drive mechanism for rotating the metal annular component in a predetermined direction; a grinding wheel pressed against the outer peripheral surface of the annular component for machining the outer peripheral surface of the annular component; and a support mechanism having an inner diameter-side support member that contacts the inner peripheral surface of the annular component and supports the annular component radially.

[0148] In the aforementioned processing apparatus, for example, the support mechanism has multiple inner diameter-side support members. In this case, for example, the support mechanism has two inner diameter-side support members.

[0149] In the aforementioned processing apparatus, for example, when the central angle centered on the central axis of the annular component is used as the reference, the circumferential central positions of the portions of two inner diameter side support components that are circumferentially adjacent to each other along the annular component and that contact the inner circumferential surface of the annular component are respectively arranged 20° to 160° apart from each other.

[0150] In the aforementioned processing apparatus, for example, the inner diameter side support member is composed of a slipper that slides in contact with the inner circumferential surface of the annular member.

[0151] In the aforementioned processing apparatus, for example, when the central angle is taken as the center angle centered on the central axis of the annular component, the circumferential width of the portion of the inner diameter side support component that contacts the inner circumferential surface of the annular component is 45° or more and 180° or less.

[0152] In the aforementioned processing apparatus, for example, the support mechanism has an elastic member that elastically applies force to the inner diameter-side support member toward the inner circumferential surface of the annular member.

[0153] In the aforementioned processing apparatus, for example, the inner diameter side support member is composed of a support roller that rolls in contact with the inner circumferential surface of the annular member.

[0154] In the aforementioned processing apparatus, for example, the rotary drive mechanism has a pad, which drives the annular component to rotate while the axial end face of the annular component is magnetically adsorbed onto the pad.

[0155] In the aforementioned processing apparatus, for example, the rotary drive mechanism includes a drive roller having an outer peripheral surface that frictionally engages with the inner or outer peripheral surface of the annular component.

[0156] In the aforementioned processing apparatus, for example, the grinding wheel is composed of a rotating grinding wheel that rotates around its own central axis while pressing its own outer peripheral surface against the outer peripheral surface of the annular component.

[0157] In the aforementioned processing apparatus, for example, when viewed from the axial direction of the annular component, at least a portion of the inner diameter side support component that contacts the inner circumferential surface of the annular component exists within a first circumferential direction range with reference to a first imaginary straight line, wherein the first imaginary straight line connects the central axis of the annular component to the central axis of the grinding wheel, and the first circumferential direction range is a range with a central angle of ±45° centered on the central axis of the annular component.

[0158] In the aforementioned processing apparatus, for example, when viewed from the axial direction of the annular component, at least a portion of the portion of the inner diameter-side support component that contacts the inner circumferential surface of the annular component exists within a second circumferential direction range with reference to a second imaginary straight line, wherein the second imaginary straight line extends from the central axis of the annular component in a direction at an angle of 90° to the first imaginary straight line, and the second circumferential direction range is a range with a central angle of ±45° centered on the central axis of the annular component.

[0159] In the aforementioned processing apparatus, for example, the grinding wheel is configured to rotate in the opposite direction of the predetermined direction around its own central axis, and rotate at a speed faster than the speed of the outer circumferential surface of the annular component, while pressing its own outer circumferential surface against the outer circumferential surface of the annular component. The second imaginary straight line extends from the central axis of the annular component in a direction offset by 90° relative to the first imaginary straight line in the opposite direction of the rotation direction of the annular component.

[0160] In the aforementioned processing apparatus, for example, at least a portion of the portion of one of the plurality of support members that contacts the inner circumferential surface of the annular member exists in the first circumferential direction range, and at least a portion of the portion of another of the plurality of support members that contacts the inner circumferential surface of the annular member exists in the second circumferential direction range.

[0161] In the aforementioned processing apparatus, for example, when the support mechanism has one of the support members, a portion of the support member that contacts the inner circumferential surface of the annular member exists in the first circumferential direction range, and another portion of the support member that contacts the inner circumferential surface of the annular member exists in the second circumferential direction range.

[0162] In the aforementioned processing apparatus, for example, the support mechanism further includes an outer diameter side support member that contacts the outer peripheral surface of the annular member and supports the annular member radially.

[0163] In the aforementioned processing apparatus, for example, the support mechanism has only the inner diameter side support member and the outer diameter side support member that contacts the outer peripheral surface of the annular member and supports the annular member radially.

[0164] In one embodiment, in the method for processing an annular component, the above-described processing apparatus for annular components is used. While supporting the metal annular component radially via the support mechanism, the annular component is rotated in the predetermined direction around its central axis via the rotation drive mechanism. The grinding wheel is then pressed against the outer peripheral surface of the annular component, thereby processing the outer peripheral surface of the annular component.

[0165] In one embodiment, the method for manufacturing a bearing including an annular component includes a step of machining the outer peripheral surface of the annular component using the above-described method for machining the annular component.

[0166] In the manufacturing method described above, for example, the bearing has an inner ring as the annular component.

[0167] In the manufacturing method described above, for example, the bearing has an outer ring as the annular component.

[0168] In one embodiment, the method for manufacturing a mechanical device is a method for manufacturing a mechanical device including a bearing, and includes a step of manufacturing the bearing by the bearing manufacturing method described above.

[0169] In one embodiment, the vehicle manufacturing method is a method for manufacturing a vehicle including a bearing, and includes a step of manufacturing the bearing by the bearing manufacturing method described above. Explanation of reference numerals in the attached figures

[0170] 1, 1a, 1b, 1c, 1d, 1e, 1f Processing devices 2.2a Rotary drive mechanism 3 Grinding wheel 4, 4a, 4b, 4c, 4d Support mechanisms 5. Ring-shaped components 5a Outer Peripheral Surface 5b Inner circumferential surface 6. Pads 7. Grinding surface 8a, 8b, 8c, 8d, 8e Inner diameter side support components End faces of 9a, 9b, and 9c 10 Electric motors 11. Shell 12 Output shafts 13a and 13b bearings 14 Motor stator 15 Motor rotor 16. Main body of the shell 17. Cover 18 Bottom 19 Keep the recess 20 Inner Circle 21 Outer ring 22 ball bearings 23. Cage 24 Inner raceway 25 Outer raceway 26a, 26b Elastic components 27a, 27b outer peripheral surfaces 28 drive rollers 29. Outer perimeter 30 Outer diameter side support component 31 end surface 40 Grinding Mechanism 100 Grinding Device 101 Pad 102 Grinding wheel 103 Ring-shaped component 104 Slipper 105 Grinding surface.

Claims

1. A processing apparatus for annular components, wherein, have: A rotary drive mechanism that causes a metal ring-shaped component to rotate circumferentially about a reference axis; A grinding mechanism having a grinding wheel pressed against the outer peripheral surface of the annular component; and A support mechanism having a support portion that contacts the inner circumferential surface of the annular member in at least one circumferential range around the reference axis, thereby supporting the annular member.

2. The processing apparatus for the annular component according to claim 1, wherein, The at least one circumferential range includes a circumferential position corresponding to the contact position between the grinding wheel and the annular component.

3. The processing apparatus for the annular component according to claim 1 or 2, wherein, The support portion has a plurality of inner diameter-side support components that respectively contact the inner circumferential surface of the annular component.

4. The processing apparatus for the annular component according to claim 3, wherein, The plurality of inner diameter side support components include a first component having a first support range and a second component having a second support range, wherein the angle between the circumferential center position of the first support range and the circumferential center position of the second support range is more than 20° and less than 160°.

5. The processing apparatus for the annular component according to any one of claims 1 to 4, wherein, The support portion has a slipper that slides in contact with the inner circumferential surface of the annular component.

6. The processing apparatus for the annular component according to claim 5, wherein, The support portion has a region that can contact the inner circumferential surface of the annular component, and the central angle corresponding to the region is more than 20° and less than 180°.

7. The processing apparatus for the annular component according to claim 5 or 6, wherein, The support mechanism has a force-applying component that applies force to the support portion toward the inner circumferential surface of the annular component.

8. The processing apparatus for the annular component according to any one of claims 1 to 7, wherein, The support portion rolls into contact with the inner circumferential surface of the annular component.

9. The processing apparatus for the annular component according to any one of claims 1 to 8, wherein, The rotary drive mechanism has a holding member that holds the annular component by magnetic adsorption, and performs rotary drive on the annular component.

10. The processing apparatus for the annular component according to any one of claims 1 to 9, wherein, The rotary drive mechanism includes a drive roller having an outer peripheral surface that frictionally engages with the inner or outer peripheral surface of the annular component.

11. The processing apparatus for the annular component according to any one of claims 1 to 10, wherein, The grinding wheel is pressed against the outer circumferential surface of the annular component while rotating.

12. The processing apparatus for the annular component according to any one of claims 1 to 11, wherein, When viewed from the axial direction of the annular component, at least a portion of the portion of the support that contacts the inner circumferential surface of the annular component exists within a first circumferential direction range with reference to a first imaginary straight line, wherein the first imaginary straight line connects the central axis of the annular component to the central axis of the grinding wheel, and the first circumferential direction range is a range with a central angle of ±45° centered on the central axis of the annular component.

13. The processing apparatus for the annular component according to claim 12, wherein, When viewed from the axial direction of the annular component, at least a portion of the portion of the support that contacts the inner circumferential surface of the annular component exists within a second circumferential direction range with reference to a second imaginary straight line, wherein the second imaginary straight line extends from the central axis of the annular component in a direction at an angle of 90° to the first imaginary straight line, and the second circumferential direction range is a range with a central angle of ±45° centered on the central axis of the annular component.

14. The processing apparatus for the annular component according to claim 13, wherein, The grinding wheel is a rotating grinding wheel that rotates about its own central axis in the opposite direction to the specified direction, with its outer circumferential surface moving at a speed faster than that of the outer circumferential surface of the annular component, while pressing its outer circumferential surface against the outer circumferential surface of the annular component. The second imaginary line extends from the central axis of the annular component in a direction offset by 90° relative to the first imaginary line in the opposite direction to the rotation direction of the annular component.

15. The processing apparatus for the annular component according to any one of claims 1 to 14, wherein, The support mechanism also has an outer diameter side support member that contacts the outer peripheral surface of the annular member and supports the annular member radially.

16. The processing apparatus for the annular component according to any one of claims 1 to 15, wherein, The support mechanism has only the inner diameter side support member and the outer diameter side support member that contacts the outer peripheral surface of the annular member and supports the annular member radially.

17. A method for processing a ring-shaped component, comprising: The process of rotating a metal ring-shaped component circumferentially about a reference axis; and The process of pressing a grinding wheel onto the outer circumferential surface of the annular component includes a process of supporting the annular component by bringing a support portion into contact with the inner circumferential surface of the annular component in at least one circumferential range around the reference axis.

18. A method for manufacturing a bearing comprising an annular component, comprising a step of machining the outer peripheral surface of the annular component using the machining method for the annular component as described in claim 17.

19. The method for manufacturing a bearing according to claim 18, wherein, The bearing has an inner ring as the annular component.

20. The method for manufacturing a bearing according to claim 18, wherein, The bearing has an outer ring as the annular component.

21. A method for manufacturing a mechanical device, comprising: The process of manufacturing a mechanical component using the manufacturing method of claim 18; and The process of installing the mechanical components into the main body of the device.

22. A method for manufacturing a vehicle, comprising: The process of manufacturing a bearing using the manufacturing method of claim 18; and The process of installing the bearing onto the vehicle body.

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