Bearing roller running method ultra-precision polishing device and method

Abstract

The invention discloses a bearing roller running method ultra-precision polishing device and method.The device comprises a rack, a multi-axis movement module, a main shaft module, a polishing head module, a polishing sample module, a clamping module and a control module, the multi-axis movement module is used for adjusting the position of the polishing head module, and centering of the polishing head module and the polishing sample module is achieved; the sample polishing module is used for loading a bearing roller and a polishing solution, the clamping module is used for installing the sample polishing module, the control module is used for controlling motors of the multi-axis movement module and the main shaft module to operate, and during polishing, the polishing head module and the sample polishing module form a similar bearing structure to simulate the running-in process of a rolling bearing so as to realize polishing. According to the invention, key components of the module are manufactured by 3D printing, so that the device can be quickly suitable for bearing rollers with different diameters, ultra-precise polishing of the bearing rollers can be realized by utilizing the synergistic effect of machinery and chemistry, all rollers in one bearing can be polished at the same time, and the consistency of the polishing effect of the rollers is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of precision machining, and in particular relates to an ultra-precision polishing device and method for a bearing roller running method. Background Art

[0002] High-performance rolling bearings are a typical core basic component, widely used in high-end equipment in the fields of rail transportation, aerospace, defense and military. The accuracy and surface integrity of their working surfaces directly determine the performance, quality and reliability of the equipment (Wang Yu, Yan Ke, Zhang Jinhua, Progress in Basic Research on High-Performance Rolling Bearings in my country, China Basic Science, 2015, 17(06): 10-19+12+65-66). At present, the industry usually uses grinding and lapping technology to process core components of bearings such as rolling elements, inner and outer rings.However, the above processing technology is limited by the principle of pure mechanical removal. The contact pressure during removal needs to reach the plastic yield limit of the material, the minimum removal thickness is limited, the surface roughness is limited, and various forms of damage are inevitably generated under the action of thermal-mechanical coupling. It is very likely to cause improper bearing lubrication and failure under harsh service conditions such as start-stop, high temperature, vibration and shock, and oil supply difficulties, affecting equipment performance (T. Ueda, N. Mitamura, Mechanism of dent initiated flaking and bearing life enhancement technology under contaminated lubrication condition. Part II: Effect of rolling element surface roughness on flaking resulting from dents, and life enhancement technology of rolling bearings under contaminated lubrication condition, Tribology International, 2009, 42(11): 1832-1837; Hiroki Komata, Yasuhiro Iwanaga, Tohru Ueda, Koji Ueda, Nobuaki Mitamura, Enhanced performance of rolling bearings by improving the stability of rolling elements to surface degradation, in: JMBeswick (Ed.) Bearing Steel Technologies: 10th Volume, Advances in Steel Technologies for Rolling Bearings, ASTM International, West Conshohocken, PA, 2015, pp. 272-290).

[0003] Ultra-precision surface manufacturing is expected to solve the above problems from a manufacturing perspective. According to references (JC Skurka, Elastohydrodynamic Lubrication of Roller Bearings, Journal of Lubrication Technology, 1970, 92 (2): 281-288.; MR Balan, A. Tufescu, SS Cretu, A case study on relationship between roughness, lubrication and fatigue life of rolling bearings, IOP Conference Series: Materials Science and Engineering, 2016, 147 (1): 01-2013), reducing surface roughness can increase the film thickness ratio (ratio of oil film thickness to surface roughness) and improve bearing fatigue life. According to the reference (T. Ueda, N. Mitamura, Mechanism of dent initiated flaking and bearing life enhancement technology under contaminated lubrication condition. Part II: Effect of rolling element surface roughness on flaking resulting from dents, and life enhancement technology of rolling bearings under contaminated lubrication condition, Tribology International, 2009, 42 (11): 1832-1837), a 6206 deep groove ball bearing was used for the experiment. The raceway surface roughness Ra was kept at 39 nm. When the rolling element surface roughness was reduced from 24 nm to 7 nm, the dent initiated flaking life (dent initiated flaking life, L 10 ) is improved by about one order of magnitude. The analysis suggests that the surface roughness of the rolling element is reduced, the tangential force applied to the raceway surface is reduced, and the spalling is improved.

[0004] In order to achieve ultra-precision machining of bearing roller surfaces, researchers have developed a variety of polishing methods, such as shear thickening polishing (M. Li, B. Lyu, J. Yuan, C. Dong, W. Dai, Shear-thickening polishing method, International Journal of Machine Tools and Manufacture, 94 (2015) 88-99) and magnetorheological polishing (M. Singh, AK Singh, Magnetorheological finishing of variable diametric external surface of the tapered cylindrical workpieces for functionality improvement, Journal of Manufacturing Processes, 61 (2021) 153-172). However, these polishing methods mainly use mechanical shearing to remove surface materials, which will still produce a certain damage layer. In addition, the material of the bearing roller is mostly steel, which has certain magnetism, which may affect the magnetorheological polishing effect.

[0005] In summary, the existing polishing methods have certain limitations. First, it is necessary to continue to improve the ability of ultra-precision and low-damage processing of bearing roller surfaces. Second, it is necessary to continue to improve the consistency of bearing roller polishing effects. Therefore, it is urgent to explore new polishing methods to overcome the limitations of existing technologies. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned technology, the present invention provides an ultra-precision polishing device and method for a bearing roller running method.

[0007] The specific plan is as follows:

[0008] A bearing roller running method ultra-precision polishing device, the polishing device comprises a frame, a multi-axis motion module, a spindle module, a polishing head module, a polishing sample module, a clamping module and a control module. The frame carries the multi-axis motion module, the spindle module, the polishing head module, the polishing sample module, the clamping module and the control module. The spindle module clamps the polishing head module and is installed on the multi-axis motion module together. The polishing sample module is installed on the clamping module and is used to load bearing rollers and polishing liquid. The multi-axis motion module is used to adjust the position of the spindle module and the clamped polishing head module to achieve centering of the polishing head module and the polishing sample module. The control module is used to control the motors in the multi-axis motion module and the spindle module to run according to the set program.

[0009] Furthermore, the frame includes a profile support frame and an aluminum plate, the profile support frame is used to install the multi-axis motion module and the aluminum plate is used to install the clamping module.

[0010] Furthermore, the multi-axis motion module includes X-axis, Y-axis, and Z-axis linear modules, a vertical connecting plate, and a horizontal connecting plate. The X-axis, Y-axis, and Z-axis linear modules include an X-axis linear module, a Y-axis linear module, and a Z-axis linear module. The three modules are driven by their module motors. The X-axis, Y-axis, and Z-axis linear modules are connected by a vertical connecting plate, and the Y-axis linear module is installed on the profile support frame through a horizontal connecting plate. The accuracy of the X-axis, Y-axis, and Z-axis linear modules is 0.01mm.

[0011] Furthermore, the spindle module includes a spindle bracket, a spindle motor, a flexible coupling and a pneumatic chuck. The spindle bracket is installed on the multi-axis motion module, the spindle motor is installed on the spindle bracket, the flexible coupling connects the spindle motor and the pneumatic chuck, the pneumatic chuck is used to install the polishing head module, and the spindle motor drives the flexible coupling, the pneumatic chuck and the polishing head module to rotate in turn.

[0012] Furthermore, the polishing head module includes an inner substrate, an inner polishing pad and a connecting shaft. The size of the inner substrate is designed and manufactured with reference to the size of the inner ring of the bearing. The inner polishing pad is evenly pasted on the outer surface of the inner substrate. The upper end of the connecting shaft is connected to the pneumatic chuck, and the lower end of the connecting shaft is connected to the inner substrate by a set screw, so that the spindle motor drives the polishing head module to rotate. The inner substrate is manufactured by 3D printing, and the materials selected are polylactic acid, acrylonitrile (A)-butadiene (B)-styrene (S), thermoplastic polyurethane rubber, and carbon fiber composite materials. The materials of the inner polishing pad are polyurethane, synthetic leather, and wool felt.

[0013] Furthermore, the polishing sample module includes an outer substrate, an outer polishing pad and a retaining frame. The size of the outer substrate is designed and manufactured with reference to the size of the bearing outer ring. The outer polishing pad is evenly pasted on the inner surface of the outer substrate. The retaining frame is designed and manufactured according to the size and number of the bearing rollers. It is mainly used to isolate the bearing rollers to prevent them from colliding with each other and to ensure the relative position of the bearing rollers. The outer substrate and the retaining frame are manufactured by 3D printing. The materials selected are polylactic acid, acrylonitrile (A)-butadiene (B)-styrene (S), thermoplastic polyurethane rubber, and carbon fiber composite materials. The materials of the outer polishing pad are polyurethane, synthetic leather, and wool felt.

[0014] Furthermore, the clamping module includes a connecting plate, a polishing liquid recovery tank and a three-claw cylinder. The connecting plate is installed on the aluminum plate, the polishing liquid recovery tank is installed on the connecting plate to collect the polishing liquid splashed out of the polishing sample module, and the three-claw cylinder is installed on the polishing liquid recovery tank to install the polishing sample module.

[0015] Furthermore, the control module controls the module motors in the multi-axis motion module to run according to the program, completes the centering of the polishing head module and the polishing sample module, and enables the polishing head module and the polishing sample module to jointly press the bearing roller during polishing, so that the polishing surface of the bearing roller can contact the inner polishing pad and the outer polishing pad at all locations. At the same time, the control module controls the spindle motor to run according to the program, and then controls the spindle module to drive the polishing head module to rotate, generates friction between the inner polishing pad and the bearing roller, drives the bearing roller to rotate and revolve, and realizes polishing.

[0016] The present invention also provides a bearing roller running-in ultra-precision polishing method, which uses the above-mentioned polishing device to polish the bearing roller, comprising the following steps:

[0017] S1. First, according to the characteristic size of the bearing where the bearing roller to be polished is located, a polishing head module and a polishing sample module are designed and manufactured, including an inner substrate, an outer substrate and a retaining frame, wherein the size of the inner substrate is designed and manufactured with reference to the size of the inner ring of the bearing, the size of the outer substrate is designed and manufactured with reference to the size of the outer ring of the bearing, and the retaining frame is designed and manufactured according to the size and quantity of the bearing rollers;

[0018] S2, evenly stick the inner polishing pad on the inner substrate, then use the fixing bolts to install the connecting shaft on the center hole of the inner substrate to form a polishing head module, and then install the polishing head module on the pneumatic chuck through the connecting shaft so that the spindle motor can control the rotation of the polishing head module;

[0019] S3, evenly stick the outer polishing pad on the outer substrate, then put the bearing roller into the retainer, and then put the whole into the outer substrate, so that the bearing roller is close to the outer polishing pad to form a polishing sample module, and then install the polishing sample module on the clamping module through a three-claw cylinder;

[0020] S4, determining the X and Y coordinate values ​​of the center of the polishing sample module according to the size of the polishing device, controlling the movement of the multi-axis motion module through the control module, thereby adjusting the position of the spindle module, so that the X and Y coordinates of the centers of the polishing head module and the polishing sample module coincide, completing the centering, and then controlling the Z coordinate value of the polishing head module to complete the vertical coordination of the polishing head module and the polishing sample module, so that the polishing head module and the polishing sample module jointly press the bearing roller to generate polishing pressure;

[0021] S5. Prepare the polishing liquid, stir it evenly, and pour it into the polishing sample module;

[0022] S6. Control the spindle motor through the control module to drive the polishing head module to rotate, generate friction between the inner polishing pad and the bearing roller, drive the bearing roller to rotate and revolve, and realize polishing;

[0023] S7. After polishing, remove the bearing roller and check the surface quality after polishing. If it does not meet the requirements, repeat the process until it meets the requirements.

[0024] Furthermore, the polishing liquid comprises: an oxidant, a complexing agent, water, and a pH value of 2-11, wherein the oxidant is selected from one or more of hydrogen peroxide, persulfate, iodate, periodate, and perchlorate, and the complexing agent is selected from one or more of organic acids and amino acids.

[0025] Beneficial effects of the present invention:

[0026] 1. Using 3D printing to produce key module components can quickly adapt to bearing rollers of different diameters.

[0027] 2. Ultra-precision polishing of bearing rollers can be achieved by utilizing the synergistic effect of mechanics and chemistry.

[0028] 3. All rollers in a bearing can be polished at the same time to ensure the consistency of roller polishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings to be used in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0030] Figure 1 It is a schematic diagram of the overall structure of the ultra-precision polishing device of the bearing roller running method of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the frame of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the multi-axis motion module of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the spindle module of the present invention;

[0034] Figure 5 It is a schematic structural diagram of a polishing head module and a polishing sample module of the present invention;

[0035] Figure 6 A schematic diagram of the polishing pressure and relative speed of the bearing roller of the present invention;

[0036] Figure 7 It is a structural schematic diagram of the clamping module of the present invention;

[0037] Figure 8 The photograph of the cylindrical surface of the bearing roller of the present invention before polishing, and the three-dimensional morphology and surface roughness measurement result diagram;

[0038] Fig. 9 The following are photos of the cylindrical surface of the bearing roller after polishing, and diagrams of the three-dimensional morphology and surface roughness measurement results.

[0039] Explanation of the reference numerals: 1-frame; 2-multi-axis motion module; 3-spindle module; 4-polishing head module; 5-polishing sample module; 6-clamping module; 7-control module; 101-profile support frame; 102-aluminum plate; 201-X, Y, Z axis linear module; 202-vertical connecting plate; 203-horizontal connecting plate; 301-spindle bracket; 302-spindle motor; 303-flexible coupling; 304-pneumatic chuck; 401-inner substrate; 402-inner polishing pad; 403-connecting shaft; 501-outer substrate; 502-outer polishing pad; 503-retaining frame; 601-connecting plate; 602-polishing liquid recovery tank; 603-three-claw cylinder. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Reference Figures 1 to 7 The present embodiment provides an ultra-precision polishing device for a bearing roller running method, comprising a frame 1, a multi-axis motion module 2, a spindle module 3, a polishing head module 4, a polishing sample module 5, a clamping module 6 and a control module 7. The frame 1 carries the multi-axis motion module 2, the spindle module 3, the polishing head module 4, the polishing sample module 5, the clamping module 6 and the control module 7. The spindle module 3 clamps the polishing head module 4 and is installed on the multi-axis motion module 2 together. The polishing sample module 5 is installed on the clamping module 6 for loading bearing rollers and polishing liquid. The multi-axis motion module 2 is used to adjust the position of the spindle module 3 and the clamped polishing head module 4 to achieve the centering of the polishing head module 4 and the polishing sample module 5. The control module 7 is used to control the motors in the multi-axis motion module 2 and the spindle module 3 to run according to the set program.

[0043] Reference Figure 1 and Figure 2The rack 1 includes a profile support frame 101 and an aluminum plate 102. The main function of the rack 1 is to carry other functional modules and serve as an installation reference. The profile support frame 101 includes two types, namely 8040 aluminum profile and 8080 aluminum profile. The aluminum profiles are connected by screws. Among them, the 8040 aluminum profile is connected to the multi-axis motion module 2, and the 8080 aluminum profile is connected to the aluminum plate 102. After installation, the horizontality of the aluminum plate 102 is guaranteed.

[0044] Reference Figure 1 and Figure 3 The multi-axis motion module 2 includes an X-axis, Y-axis, and Z-axis linear module 201, a vertical connecting plate 202, and a horizontal connecting plate 203. The main function of the multi-axis motion module 2 is to adjust the position of the spindle module 3 and the clamped polishing head module 4 to achieve the centering of the polishing head module 4 and the polishing sample module 5. The X-axis, Y-axis, and Z-axis linear module 201 includes an X-axis linear module, a Y-axis linear module, and a Z-axis linear module. The three modules are driven by their module motors. The X-axis, Y-axis, and Z-axis linear modules 201 are connected by a vertical connecting plate 202. After installation, the verticality of the X-axis, Y-axis, and Z-axis linear modules 201 is guaranteed. The Y-axis linear module in the module 201 is connected to the horizontal connecting plate 203 by screws, and the horizontal connecting plate 203 is connected to the 8040 aluminum profile in the profile support frame 101 by screws to ensure that the X-, Y-, and Z-axis linear modules 201 are fixed on the frame 1. The X and Y coordinate values ​​of the center of the polishing sample module 5 are determined by the size of the polishing device. The X and Y coordinate values ​​of the center of the polishing head module 4 are adjusted by the multi-axis motion module 2 to coincide with the X and Y coordinates of the center of the polishing sample module 5 to achieve centering. The Z-axis linear module is controlled to adjust the Z coordinate value of the polishing head module 4 to achieve vertical coordination between the polishing head module 4 and the polishing sample module 5.

[0045] Reference Figure 1 and Figure 4 The spindle module 3 includes a spindle bracket 301, a spindle motor 302, a flexible coupling 303 and a pneumatic chuck 304. The main function of the spindle module 3 is to drive the polishing head module 4 to rotate. The main function of the spindle bracket 301 is to carry other components of the spindle module 3 and to be connected to the multi-axis motion module 2 by bolts. The spindle motor 302 is installed on the spindle bracket 301 by bolts. The pneumatic chuck 304 is connected to the spindle bracket 301 through a bearing seat and to the spindle motor 302 through a flexible coupling 303. The pneumatic chuck 304 realizes the installation and loosening of the polishing head module 4 by controlling the air pressure. After installation, the output shaft of the spindle motor 302, the flexible coupling 303 and the pneumatic chuck 304 are ensured to be aligned.

[0046] Reference Figure 1 and Figure 5The polishing head module 4 includes an inner substrate 401, an inner polishing pad 402 and a connecting shaft 403. The size of the inner substrate 401 is designed and manufactured with reference to the size of the inner ring of the bearing. The inner polishing pad 402 is evenly pasted on the outer surface of the inner substrate 401. The upper end of the connecting shaft 403 is connected to the pneumatic chuck 304, and the lower end of the connecting shaft 403 is connected to the inner substrate 401 through a set screw, so that the spindle motor 302 drives the polishing head module 4 to rotate. The inner substrate 401 is manufactured by 3D printing, and the materials selected are polylactic acid, acrylonitrile (A)-butadiene (B)-styrene (S), thermoplastic polyurethane rubber, and carbon fiber composite materials. The materials of the inner polishing pad 402 are polyurethane, synthetic leather, and wool felt. In this embodiment, the material of the inner substrate 401 is polylactic acid, and the material of the inner polishing pad 402 is polyurethane.

[0047] Reference Figure 1 and Figure 5 The polishing sample module 5 includes an outer substrate 501, an outer polishing pad 502 and a retaining frame 503. The size of the outer substrate 501 is designed and manufactured with reference to the size of the bearing outer ring. The outer polishing pad 502 is evenly pasted on the inner surface of the outer substrate 501. The retaining frame 503 is designed and manufactured according to the size and number of the bearing rollers. It is mainly used to isolate the bearing rollers to prevent them from colliding with each other and to ensure the relative position of the bearing rollers. The outer substrate 501 and the retaining frame 503 are manufactured by 3D printing. The materials selected are polylactic acid, acrylonitrile (A)-butadiene (B)-styrene (S), thermoplastic polyurethane rubber, and carbon fiber composite materials. The materials of the outer polishing pad 502 are polyurethane, synthetic leather, and wool felt. In this embodiment, the materials of the outer substrate 501 and the retaining frame 503 are polylactic acid, and the material of the outer polishing pad 502 is polyurethane.

[0048] Reference Figure 5 and Figure 6 The main function of the polishing head module 4 and the polishing sample module 5 is to form a bearing-like structure, relying on the friction between the inner polishing pad and the bearing roller to drive the bearing roller to rotate and revolve, thereby realizing the running-in polishing of the bearing roller.

[0049] Reference Figure 6 The polishing pressure on the bearing roller comes from the deformation of the inner polishing pad 402 and the outer polishing pad 502. By controlling the sizes of the inner substrate 401 and the outer substrate 501, the inner polishing pad 402 and the outer polishing pad 502 are compressed during polishing, thereby generating polishing pressure. The relative speed between the bearing roller and the polishing pad comes from the friction between the inner polishing pad and the bearing roller. The friction drives the bearing roller to rotate and revolve to achieve polishing. During the polishing process, the contact point between the bearing roller and the inner polishing pad 402 changes all the time, which ensures that the material on the polishing surface of a single bearing roller is evenly removed. At the same time, the polishing pressure and relative speed between all bearing rollers and the inner polishing pad are consistent during the polishing process, which ensures the consistency of the roller polishing effect.

[0050] Reference Figure 1 and Figure 7 The clamping module 6 includes a connecting plate 601, a polishing liquid recovery tank 602 and a three-claw cylinder 603. The main function of the clamping module 6 is to install the polishing sample module 5. The connecting plate 601 is installed on the aluminum plate 102 by bolts. The polishing liquid recovery tank 602 is installed on the connecting plate 601 by three evenly distributed positioning pins, which is used to collect the polishing liquid splashed out of the polishing sample module 5. The three-claw cylinder 603 is positioned through the hole of the polishing liquid recovery tank 602 and is installed on the polishing liquid recovery tank 602 by screws. The three-claw cylinder 603 realizes the installation and loosening of the polishing sample module 5 by controlling the air pressure. After installation, ensure that the connecting plate 601, the polishing liquid recovery tank 602, the three-claw cylinder 603 and the polishing sample module 5 are aligned.

[0051] Reference Figure 1 The main function of the control module 7 is to control the module motor in the multi-axis motion module 2 to run according to the program, complete the centering of the polishing head module 4 and the polishing sample module 5, so that the polishing head module 4 and the polishing sample module 5 can jointly press the bearing roller during polishing, so that the polishing surface of the bearing roller can contact the inner polishing pad 402 and the outer polishing pad 502 at all places. At the same time, the control module 7 controls the spindle motor 302 to run according to the program, and then controls the spindle module 3 to drive the polishing head module 4 to rotate, and friction is generated between the polishing head module 4 and the bearing roller, which drives the bearing roller to rotate and revolve to achieve polishing.

[0052] The present invention also discloses a bearing roller running method ultra-precision polishing method, referring to Figures 1 to 7 , the bearing roller is polished by an ultra-precision polishing device using a bearing roller running method, including the following steps:

[0053] S1. First, according to the characteristic size of the bearing where the bearing roller to be polished is located, the polishing head module 4 and the polishing sample module 5 are designed and manufactured, including the inner substrate 401, the outer substrate 501 and the retaining frame 503. In this example, the diameter of the bearing roller to be polished is 11 mm, the width is 12 mm, and the number is 9. The material of the inner polishing pad 402 and the outer polishing pad 502 is polyurethane. According to the size of the bearing and the original thickness of the inner polishing pad 402 and the outer polishing pad 502 of 1.5 mm, the outer diameter of the inner substrate 401 and the inner diameter of the outer substrate 501 are preset to be 51.6 mm and 88 mm respectively. The shape and size of the retaining frame 503 are determined according to the diameter, width and number of the bearing rollers. After design, the inner substrate 401, the outer substrate 501 and the retaining frame 503 are manufactured by 3D printing, and the material is polylactic acid;

[0054] S2, attach the inner substrate 401 to the inner polishing pad 402, and use the fixing bolts to install the connecting shaft 403 on the center hole of the inner substrate 401 to form a polishing head module 4, and install the polishing head module 4 on the pneumatic chuck 304, so that the spindle motor 302 can control the rotation of the polishing head module 4;

[0055] S3, attach the outer substrate 501 to the outer polishing pad 502, put the bearing roller into the retainer 503, and then put the whole into the outer substrate 501, so that the bearing roller is close to the outer polishing pad 502, to form a polishing sample module 5, and install the polishing sample module 5 on the clamping module 6 through the three-claw cylinder 603;

[0056] S4, controlling the movement of the multi-axis motion module 2 through the control module 7, thereby adjusting the position of the spindle module 3 and the clamped polishing head module 4, so that the polishing head module 4 and the polishing sample module 5 are aligned, and the coordinates of the polishing sample module 5 can be accurately calculated according to the size of the clamping module 6 and other parts, and the X and Y coordinates of the center of the polishing head module 4 are adjusted to coincide with the X and Y coordinates of the center of the polishing sample module 5 to complete the alignment, and then adjust the Z coordinate of the polishing head module 4 to complete the vertical cooperation between the polishing head module 4 and the polishing sample module 5, so that the polishing head module 4 and the polishing sample module 5 jointly press the bearing roller to generate polishing pressure;

[0057] S5, prepare polishing liquid. Considering that the material of the bearing roller is high-carbon chromium bearing steel, the polishing liquid components are selected to be 2wt% of silicon dioxide abrasive, 1wt% of hydrogen peroxide, 1.4wt% of citric acid, and the rest is water. The pH value is 3, stir evenly, and pour into the polishing sample module 5;

[0058] S6. Input a control program into the control module 7, set the speed of the spindle motor 302 to 400 r / min, control the spindle motor 302 to drive the polishing head module 4 to rotate, generate friction between the inner polishing pad 402 and the bearing roller, drive the bearing roller to rotate and revolve, and realize polishing;

[0059] S7. After polishing, remove the bearing roller and check the surface quality after polishing. If it does not meet the requirements, repeat the process until it meets the requirements.

[0060] Reference Figure 8 , which are the photos, three-dimensional morphology and surface roughness measurement results of the cylindrical surface of the bearing roller before polishing. The surface of the bearing roller is rough before polishing. The "CMP" pattern mapped on the surface of the bearing roller in the photo is blurred. The surface roughness S a It is 50~70nm.

[0061] Reference Fig. 9, which are the photos, three-dimensional morphology and surface roughness measurement results of the cylindrical surface of the bearing roller after polishing. The surface of the bearing roller is smooth after polishing. The "CMP" pattern mapped on the surface of the bearing roller in the photo is clear. The surface roughness S a Reduced to 2-8nm, compared with the surface roughness S before polishing a The average reduction was 93%.

[0062] In summary, the present invention utilizes 3D printing to manufacture key components of the module, can quickly adapt to bearing rollers of different diameters, utilizes the synergistic effect of mechanics and chemistry, can achieve ultra-precision polishing of bearing rollers, can polish all rollers in a bearing at the same time, and ensures the consistency of the roller polishing effect.

[0063] This specification describes examples of embodiments of the present invention, and does not mean that these embodiments illustrate and describe all possible forms of the present invention. Those of ordinary skill in the art will appreciate that the embodiments here are to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such special statements and embodiments. Those of ordinary skill in the art can make various other various specific deformations and combinations that do not deviate from the essence of the present invention based on these technical revelations disclosed by the present invention, and these deformations and combinations are still within the protection scope of the present invention.

Claims

1. A bearing roller running method ultra-precision polishing device, characterized in that: The polishing device comprises a frame (1), a multi-axis motion module (2), a spindle module (3), a polishing head module (4), a polishing sample module (5), a clamping module (6) and a control module (7); the frame (1) carries the multi-axis motion module (2), the spindle module (3), the polishing head module (4), the polishing sample module (5), the clamping module (6) and the control module (7); the spindle module (3) clamps the polishing head module (4) and is installed on the multi-axis motion module (2); the polishing sample module (5) is installed on the clamping module (6) and is used to load bearing rollers and polishing liquid; the multi-axis motion module (2) is used to adjust the positions of the spindle module (3) and the clamped polishing head module (4) to achieve centering of the polishing head module (4) and the polishing sample module (5); and the control module (7) is used to control the motors in the multi-axis motion module (2) and the spindle module (3) to operate according to a set program.

2. The ultra-precision polishing device of a bearing roller running method according to claim 1 is characterized in that: The frame (1) comprises a profile support frame (101) and an aluminum plate (102), wherein the profile support frame (101) is used to install a multi-axis motion module (2) and the aluminum plate (102), and the aluminum plate (102) is used to install a clamping module (6).

3. The ultra-precision polishing device of a bearing roller running method according to claim 1, characterized in that: The multi-axis motion module (2) comprises an X-axis, Y-axis, and Z-axis linear module (201), a vertical connecting plate (202), and a horizontal connecting plate (203); the X-axis, Y-axis, and Z-axis linear module (201) comprises an X-axis linear module, a Y-axis linear module, and a Z-axis linear module; the three modules are driven to operate by their module motors; the X-axis, Y-axis, and Z-axis linear modules (201) are connected by a vertical connecting plate (202); and the Y-axis linear module is mounted on a profile support frame (101) by a horizontal connecting plate (203).

4. The ultra-precision polishing device of a bearing roller running method according to claim 1, characterized in that: The spindle module (3) comprises a spindle support (301), a spindle motor (302), a flexible coupling (303) and a pneumatic chuck (304); the spindle support (301) is mounted on the multi-axis motion module (2); the spindle motor (302) is mounted on the spindle support (301); the flexible coupling (303) connects the spindle motor (302) and the pneumatic chuck (304); the pneumatic chuck (304) is used to install a polishing head module (4); the spindle motor (302) drives the flexible coupling (303), the pneumatic chuck (304) and the polishing head module (4) to rotate in sequence.

5. The ultra-precision polishing device of a bearing roller running method according to claim 1, characterized in that: The polishing head module (4) comprises an inner substrate (401), an inner polishing pad (402) and a connecting shaft (403). The size of the inner substrate (401) is designed and manufactured with reference to the size of the inner ring of the bearing. The inner polishing pad (402) is evenly pasted on the outer surface of the inner substrate (401). The upper end of the connecting shaft (403) is connected to the pneumatic chuck (304). The lower end of the connecting shaft (403) is connected to the inner substrate (401) via a set screw, so that the spindle motor (302) drives the polishing head module (4) to rotate. The inner substrate (401) is manufactured by 3D printing, and the materials selected are polylactic acid, acrylonitrile (A)-butadiene (B)-styrene (S), thermoplastic polyurethane rubber, and carbon fiber composite materials. The materials of the inner polishing pad (402) are polyurethane, synthetic leather, and wool felt.

6. The ultra-precision polishing device of a bearing roller running method according to claim 1, characterized in that: The polishing sample module (5) comprises an outer substrate (501), an outer polishing pad (502) and a retaining frame (503). The size of the outer substrate (501) is designed and manufactured with reference to the size of the outer ring of the bearing. The outer polishing pad (502) is evenly pasted on the inner surface of the outer substrate (501). The retaining frame (503) is designed and manufactured according to the size and number of the bearing rollers, and is mainly used to isolate the bearing rollers to prevent them from colliding with each other and to ensure the relative positions of the bearing rollers. The outer substrate (501) and the retaining frame (503) are manufactured by 3D printing, and the materials selected are polylactic acid, acrylonitrile (A)-butadiene (B)-styrene (S), thermoplastic polyurethane rubber, and carbon fiber composite materials. The material of the outer polishing pad (502) is polyurethane, synthetic leather, and wool felt.

7. The ultra-precision polishing device of a bearing roller running method according to claim 1, characterized in that: The clamping module (6) comprises a connecting plate (601), a polishing liquid recovery tank (602) and a three-claw air cylinder (603); the connecting plate (601) is mounted on the aluminum plate (102); the polishing liquid recovery tank (602) is mounted on the connecting plate (601) to collect the polishing liquid splashed out by the polishing sample module (5); and the three-claw air cylinder (603) is mounted on the polishing liquid recovery tank to install the polishing sample module (5).

8. The ultra-precision polishing device of a bearing roller running method according to claim 1, characterized in that: The control module (7) controls the module motor in the multi-axis motion module (2) to run according to the program, completes the centering of the polishing head module (4) and the polishing sample module (5), so that the polishing head module (4) and the polishing sample module (5) jointly press the bearing roller during polishing, so that the polishing surface of the bearing roller can contact the inner polishing pad (402) and the outer polishing pad (502) at all places. At the same time, the control module (7) controls the spindle motor (302) to run according to the program, and then controls the spindle module (3) to drive the polishing head module (4) to rotate, so that friction is generated between the inner polishing pad (402) and the bearing roller, driving the bearing roller to rotate and revolve, thereby achieving polishing.

9. A bearing roller running method ultra-precision polishing method, characterized in that: Based on the ultra-precision polishing device of the bearing roller running method according to any one of claims 1 to 8, polishing the bearing roller comprises the following steps: S1. First, according to the characteristic size of the bearing where the bearing roller to be polished is located, a polishing head module (4) and a polishing sample module (5) are designed and manufactured, including an inner substrate (401), an outer substrate (501) and a retaining frame (503); S2, the inner polishing pad (402) is evenly pasted on the inner substrate (401), and then the connecting shaft (403) is installed on the center hole of the inner substrate (401) by means of a fixing bolt to form a polishing head module (4), and then the polishing head module (4) is installed on the pneumatic chuck (304) through the connecting shaft (403), so that the spindle motor (302) can control the rotation of the polishing head module (4); S3, the outer polishing pad (502) is evenly pasted on the outer substrate (501), and then the bearing roller is placed in the retaining frame (503), and then the whole is placed in the outer substrate (501), so that the bearing roller is close to the outer polishing pad (502), forming a polishing sample module (5), and then the polishing sample module (5) is installed on the clamping module (6) through the three-claw cylinder (603); S4, controlling the movement of the multi-axis motion module (2) through the control module (7), thereby adjusting the positions of the spindle module (3) and the clamped polishing head module (4), aligning the polishing head module (4) with the polishing sample module (5), and then making the polishing head module (4) and the polishing sample module (5) jointly press the bearing roller to generate polishing pressure; S5, prepare a polishing liquid, stir it evenly, and pour it into the polishing sample module (5); S6, controlling the spindle motor (302) through the control module (7), thereby driving the polishing head module (4) to rotate, generating friction between the inner polishing pad (402) and the bearing roller, driving the bearing roller to rotate and revolve, thereby achieving polishing; S7. After polishing, remove the bearing roller and check the surface quality after polishing. If it does not meet the requirements, repeat the process until it meets the requirements.

10. The bearing roller running method ultra-precision polishing method according to claim 9, characterized in that: The polishing liquid comprises: an oxidant, a complexing agent, water, and a pH value of 2-11, wherein the oxidant is selected from one or more of hydrogen peroxide, persulfate, iodate, periodate, and perchlorate, and the complexing agent is selected from one or more of organic acids and amino acids.

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