Bearing outer ring raceway polishing device and polishing method

Abstract

The invention discloses a bearing outer ring raceway polishing device and method, relates to a bearing polishing device and method, and aims to solve the problems that an existing bearing outer ring polishing method is poor in polishing efficiency and poor in polishing effect. A material box motor drives a material box to rotate through a material box main shaft; the grinding material is filled in the driving material box; the clamp motor is arranged right above the material box; one end of the clamp spindle is coaxially and rigidly connected with a rotating shaft of the clamp motor; the other end of the clamp main shaft is fixed on the clamp, and the center line of the clamp main shaft and the rotating shaft of the material box are arranged at an angle beta; the clamp is used for fixing the bearing outer ring to be polished, and the clamp and the bearing outer ring to be polished are completely immersed in the grinding material. The beneficial effect is that the polishing efficiency and the polishing quality are improved.

Description

Technical Field

[0001] The present invention relates to a bearing polishing device and a polishing method. Background Art

[0002] Currently, the working conditions faced by bearings are becoming more and more complex, and the requirements for the service performance of bearings are constantly increasing. In order to improve the surface quality of the machined surface of the bearing outer ring, the bearing outer ring still needs to be further polished after rough and finish grinding. The current polishing method for the bearing outer ring is to directly place the bearing outer ring into a polishing machine filled with polishing material. As the polishing machine rotates, the bearing outer ring moves randomly. Through the friction between the polishing material and the bearing outer ring, the surface of the bearing outer ring raceway is polished. Since the bearing outer ring moves randomly in the polishing material, the polishing positions of the bearing outer ring raceway also appear randomly, resulting in low polishing efficiency of the bearing outer ring raceway and poor polishing effect. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems of poor polishing efficiency and poor polishing effect in the existing polishing method for the bearing outer ring, and a polishing device and a polishing method for the bearing outer ring raceway are proposed.

[0004] A polishing device for a bearing outer ring raceway according to the present invention includes a material box, a material box main shaft, and a material box motor;

[0005] The material box motor drives the material box to perform a rotary motion through the material box main shaft;

[0006] It further includes a fixture motor, a fixture main shaft, and a fixture;

[0007] One end of the fixture main shaft is coaxially and rigidly connected to the rotating shaft of the fixture motor; the other end of the fixture main shaft is fixed on the fixture, and the center line of the fixture main shaft is arranged at an angle β with the rotating shaft of the material box;

[0008] The fixture is used for clamping the bearing outer ring to be polished.

[0009] Further, the value range of β is: 50° ≤ β ≤ 60°.

[0010] Further, it further includes abrasive;

[0011] The abrasive is a mixture of abrasive grains and abrasive liquid.

[0012] Further, the rotary speed of the material box motor is 50 rpm to 60 rpm.

[0013] Further, the rotating speed of the fixture motor is 50 rpm to 60 rpm.

[0014] A polishing method for a bearing outer ring raceway includes the following steps:

[0015] Step 1: Install the bearing outer ring to be polished on the fixture.

[0016] Step 2: Start the hopper motor and the fixture motor respectively, and control the rotating shaft of the fixture motor to rotate for T minutes to complete the initial polishing. Then, turn off the hopper motor and the fixture motor respectively.

[0017] Step 3: Remove the bearing outer ring to be polished, flip it 180 degrees with its radial direction as the reference, and then install it on the fixture again.

[0018] Step 4: Start the hopper motor and the fixture motor respectively again, and control the rotating shaft of the fixture motor to rotate for T minutes, where the rotating direction of the rotating shaft of the fixture motor is opposite to that in Step 2. Then, turn off the hopper motor and the fixture motor respectively, and remove the bearing outer ring to be polished to complete the final polishing.

[0019] Furthermore, clean the surface of the bearing outer ring after the final polishing, dry it with compressed air, wipe the bearing outer ring with alcohol, and then apply anti-rust oil to the bearing outer ring.

[0020] Furthermore, the value range of T is: 20 ≤ T ≤ 30.

[0021] The present invention has the following beneficial effects compared with the prior art:

[0022] Using the bearing outer ring raceway polishing device and polishing method of the present invention to polish 5 precision-ground bearing outer rings, the results show that the average value of the surface roughness parameter Ra of the bearing outer ring raceway surface after polishing is reduced from 0.0396 to 0.0236, the average value of Rp is reduced from 0.1167 to 0.0760, the average value of Rv is reduced from 0.1314 to 0.0879, the average value of Rz is reduced from 0.2042 to 0.1639, the average value of Rt is reduced from 1.3897 to 0.7342, the average value of Rq is reduced from 0.0942 to 0.0415, and the surface compressive stress value is increased from 358.6 MPa to 513.4 MPa; after polishing, the edges and corner connection surfaces of the bearing outer ring are smoothly transitioned, the surface color is uniform, the geometric morphology and surface texture of the raceway surface are improved, the raceway roughness grade is enhanced, the residual stress on the raceway surface is improved, and the surface integrity of the part is enhanced. Therefore, through this polishing device and polishing method, the surface quality of the bearing outer ring raceway after polishing is significantly improved. At the same time, the polishing time of the existing bearing outer ring polishing method for the bearing outer ring is more than 1 hour, while the polishing method of the present invention can complete the polishing in as fast as 40 minutes, so the polishing efficiency is significantly improved. Description of the Drawings

[0023] Figure 1 It is a front structural schematic diagram of a bearing outer ring raceway polishing device described in the first specific embodiment.

[0024] Figure 2 For Figure 1 Cross-sectional view taken along line A-A

[0025] Wherein, 1 is a fixture motor; 2 is a fixture main shaft; 3 is a material box; 4 is an outer ring of a bearing to be polished; 5 is a fixture; 6 is a material box main shaft; 7 is a material box motor; 8 is abrasive Specific implementation manner

[0026] Specific implementation manner 1. In combination with Figures 1 to 2 Describe this implementation manner. The bearing outer ring raceway polishing device described in this implementation manner includes a material box 3, a material box main shaft 6 and a material box motor 7;

[0027] The material box motor 7 drives the material box 3 to perform a rotary motion through the material box main shaft 6;

[0028] It further includes a fixture motor 1, a fixture main shaft 2 and a fixture 5;

[0029] One end of the fixture main shaft 2 is coaxially and rigidly connected to the rotating shaft of the fixture motor 1; the other end of the fixture main shaft 2 is fixed on the fixture 5, and the center line of the fixture main shaft 2 is set at an angle β with the rotating shaft of the material box 3; the fixture motor 1 is arranged directly above the material box 3;

[0030] The fixture 5 is used to clamp the outer ring 4 of the bearing to be polished; both the fixture 5 and the outer ring 4 of the bearing to be polished are completely immersed in the abrasive 8.

[0031] In this embodiment, the material box 3 has a cylindrical structure. One end of the main shaft 6 of the material box is rigidly connected to the rotating shaft of the material box motor 7, and the other end of the main shaft 6 of the material box is fixed at the center of the outer bottom surface of the material box 3; the fixture 5 is clamped outside the outer ring 4 of the bearing, and the bearing outer ring 4 to be polished is installed on the fixture 5 and inserted into the material box 3 at a certain angle. The other end of the main shaft 2 of the fixture is fixed on the middle side wall of the fixture 5; the fixture motor 1 drives the fixture 5 and the bearing outer ring 4 to be polished to rotate clockwise or counterclockwise through the main shaft 2 of the fixture, and the material box motor 7 drives the material box 3 to perform a rotary motion through the main shaft 6 of the material box; five polished bearing outer rings are polished. The results show that the average value of the surface roughness parameter Ra of the raceway surface of the bearing outer ring after polishing is reduced from 0.0396 to 0.0236, the average value of Rp is reduced from 0.1167 to 0.0760, the average value of Rv is reduced from 0.1314 to 0.0879, the average value of Rz is reduced from 0.2042 to 0.1639, the average value of Rt is reduced from 1.3897 to 0.7342, the average value of Rq is reduced from 0.0942 to 0.0415, and the surface compressive stress value is increased from 358.6 MPa to 513.4 MPa; after polishing, the edges and corner connection surfaces of the bearing outer ring are smoothly transitioned, the surface color is uniform, the geometric shape and surface texture of the raceway surface are improved, the raceway roughness grade is increased, the residual stress on the raceway surface is improved, and the surface integrity of the part is improved.

[0032] Specific Embodiment 2: This embodiment further limits a bearing outer ring raceway polishing device described in Specific Embodiment 1. In this embodiment, the value range of β is: 50° ≤ β ≤ 60°.

[0033] In this embodiment, through experiments, it can be known that when the center line of the main shaft 2 of the fixture forms an angle of 50° to 60° with the rotation axis of the material box 3, the polishing efficiency is the highest and the quality of the raceway of the bearing outer ring after polishing is the best.

[0034] Specific Embodiment 3: This embodiment further limits a bearing outer ring raceway polishing device described in Specific Embodiment 1. In this embodiment, it further includes abrasive 8;

[0035] The abrasive 8 is a mixture of abrasive grains and abrasive liquid.

[0036] In this embodiment, the abrasive 8 is a mixture of abrasive grains and abrasive liquid, and the polishing effect is the best. The mixing ratio of the abrasive grains and the abrasive liquid is 1:1; the normal direction of the end face of the bearing outer ring 4 to be polished forms a certain angle with the flow direction of the abrasive 8 at the position where the bearing outer ring 4 to be polished is located. The abrasive 8 flows from one side of the raceway point of the bearing outer ring 4 to the other side and flows relatively to the inner surface of the bearing outer ring 4 to be polished, forming a particle flow field to realize point raceway polishing of the bearing outer ring 4 to be polished.

[0037] Specific Embodiment Four: This embodiment further defines a polishing device for the raceway of the bearing outer ring described in Specific Embodiment One. In this embodiment, the rotational speed of the material box motor 7 is 50 rpm to 60 rpm.

[0038] In this embodiment, the material box motor 7 rotates in a clockwise one - circle and counter - clockwise one - circle rotation mode, and the rotational speed is represented by ω1. ω1 is 50 rpm to 60 rpm. If the rotational speed is too high, the direction - changing speed of the abrasive 8 cannot match the speed - changing mode of the material box motor 7, and the best polishing effect cannot be achieved. If the rotational speed is too slow, the collision speed between the abrasive 8 and the bearing outer ring 4 is too small, and the best polishing effect cannot be achieved either. Therefore, the rotational speed of this material box motor 7 is matched with the abrasive 8, and the best polishing effect is achieved by matching the rotational speed of the material box motor 7 with the component ratio of the abrasive 8.

[0039] Specific Embodiment Five: This embodiment further defines a polishing device for the raceway of the bearing outer ring described in Specific Embodiment One. In this embodiment, the rotational speed of the fixture motor 1 is 50 rpm to 60 rpm.

[0040] In this embodiment, if the rotational speed of the fixture motor 1 is too high, the bearing outer ring 4 is easily damaged. If the rotational speed of the fixture motor 1 is too low, the polishing quality and efficiency of the bearing outer ring 4 will be affected. Therefore, in this embodiment, the rotational speed of the fixture motor 1 is represented by ω2, and ω2 is 50 rpm to 60 rpm. This rotational speed is the best polishing rotational speed, which can not only ensure that the bearing outer ring 4 is not damaged, but also ensure the best polishing quality and the highest polishing efficiency of the bearing outer ring 4.

[0041] Specific Embodiment Six: A polishing method for a polishing device for the raceway of the bearing outer ring described in Specific Embodiment One. In this embodiment, it includes the following steps:

[0042] Step One: Install the bearing outer ring 4 to be polished on the fixture 5.

[0043] Step Two: Start the material box motor 7 and the fixture motor 1 respectively, and control the rotation shaft of the fixture motor 1 to rotate for T minutes to complete the primary polishing. Then turn off the material box motor 7 and the fixture motor 1 respectively.

[0044] Step Three: Remove the bearing outer ring 4 to be polished, and after flipping the bearing outer ring 4 to be polished by 180 degrees with its radial direction as the reference, install it on the fixture 5 again.

[0045] Step 4: Start the bin motor 7 and the fixture motor 1 again, and control the rotating shaft of the fixture motor 1 to rotate for T minutes, where the rotating direction of the rotating shaft of the fixture motor 1 is opposite to that in Step 2; then turn off the bin motor 7 and the fixture motor 1 respectively, and remove the bearing outer ring 4 to be polished to complete the final polishing.

[0046] In this embodiment, starting the bin motor 7 and the fixture motor 1 has no sequence requirement. They can be started simultaneously or one after the other, which does not affect the polishing efficiency and quality. At the same time, after each installation of the bearing outer ring 4 to be polished on the fixture 5, it is necessary to ensure that the fixture 5 and the bearing outer ring 4 are integrally immersed in the abrasive 8.

[0047] Specific Embodiment 7: This embodiment further limits the method for polishing the raceway of the bearing outer ring described in Specific Embodiment 6. In this embodiment, the surface of the bearing outer ring 4 after final polishing is cleaned and dried with compressed air, wiped with alcohol, and then coated with rust preventive oil.

[0048] In this embodiment, cleaning the surface of the bearing outer ring 4 and drying it with compressed air, wiping the bearing outer ring 4 with alcohol, and coating the bearing outer ring 4 with rust preventive oil are for rust prevention treatment of the bearing outer ring 4. At the same time, the appearance of the bearing outer ring 4 should also be inspected to prevent damage to the bearing outer ring 4 during polishing.

[0049] Specific Embodiment 8: This embodiment further limits the method for polishing the raceway of the bearing outer ring described in Specific Embodiment 6. In this embodiment, the value range of T is: 20 ≤ T ≤ 30.

[0050] In this embodiment, if the polishing time is too short, the best polishing effect cannot be achieved; if the polishing time is too long, the polishing efficiency will be affected. And controlling the polishing time between 20 minutes and 30 minutes each time can ensure the best polishing effect and the best polishing efficiency.

[0051] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A bearing outer ring raceway polishing device, comprising a material box (3), a material box spindle (6) and a material box motor (7); The material box motor (7) drives the material box (3) to perform a rotary motion via the material box main shaft (6); It is characterized in that It also includes a fixture motor (1), a fixture spindle (2) and a fixture (5); One end of the fixture spindle (2) is coaxially and rigidly connected to the rotating shaft of the fixture motor (1); the other end of the fixture spindle (2) is fixed to the fixture (5), and the center line of the fixture spindle (2) is arranged at an angle β to the rotating shaft of the material box (3); The clamp (5) is used for clamping the bearing outer ring (4) to be polished.

2. A bearing outer ring raceway polishing device according to claim 1, characterized in that: The value range of β is: 50°≤β≤60°.

3. A bearing outer ring raceway polishing device according to claim 1, characterized in that: It also includes an abrasive (8); the abrasive (8) is a mixture of abrasive particles and abrasive liquid.

4. A bearing outer ring raceway polishing device according to claim 1, characterized in that: The rotation speed of the material box motor (7) is 50 rpm to 60 rpm.

5. The bearing outer ring raceway polishing device according to claim 1, characterized in that: The rotation speed of the clamp motor (1) is 50 rpm to 60 rpm.

6. A polishing method for a bearing outer ring raceway polishing device according to claim 1, characterized in that: The following steps are involved: Step 1: Mount the bearing outer ring (4) to be polished on a fixture (5); Step 2: start the material box motor (7) and the clamp motor (1) respectively, and control the rotating shaft of the clamp motor (1) to rotate for T minutes; After the initial polishing is completed, the material box motor (7) and the fixture motor (1) are turned off respectively; Step 3, remove the bearing outer ring (4) to be polished, turn the bearing outer ring (4) to be polished 180 degrees based on its radial direction, and then install it on the fixture (5) again; Step 4. Start the material box motor (7) and the fixture motor (1) again, and control the rotating shaft of the fixture motor (1) to rotate for T minutes, wherein the rotation direction of the rotating shaft of the fixture motor (1) is opposite to the rotation direction of the rotating shaft of the fixture motor (1) in step 2; then turn off the material box motor (7) and the fixture motor (1), remove the outer ring of the bearing to be polished (4), and complete the final polishing.

7. A method for polishing the outer ring raceway of a bearing according to claim 6, characterized in that: The surface of the bearing outer ring (4) that has been finally polished is cleaned and blown dry with compressed air, the bearing outer ring (4) is wiped with alcohol, and then anti-rust oil is applied to the bearing outer ring (4).

8. A method for polishing the outer ring raceway of a bearing according to claim 6, characterized in that: The value range of T is: 20≤T≤30.

Images