A method of inhibiting bearing current erosion and a bearing

Abstract

This application provides a method and a bearing for suppressing bearing electro-erosion, relating to the field of bearing electro-erosion suppression technology. The method includes the following steps: obtaining a bearing component and disassembling it to obtain a bearing ring, a cage, and rollers. The bearing ring has a raceway surface that mates with the rollers. At least one annular linear groove is pre-fabricated on the raceway surface using a scribing device. The annular linear groove is coaxially arranged with the bearing ring. The cage, rollers, and scribed bearing ring are then assembled to obtain an anti-electro-erosion bearing. This application uses the annular linear groove to change the electric field distribution on the rolling surface of the bearing ring, blocking the continuous conduction of electro-erosion current and reducing the accumulation of electro-erosion energy, thereby suppressing the generation of electro-erosion damage.

Description

Technical Field

[0001] This invention relates to the field of bearing electro-erosion suppression technology, and in particular to a method for suppressing bearing electro-erosion and a bearing. Background Technology

[0002] Bearings are core components of modern high-end equipment, widely used in aerospace, automotive manufacturing, and other fields. Their operational stability and reliability directly determine the performance of the equipment. In variable frequency drive scenarios, high-frequency common-mode voltage easily generates shaft voltage, which, after breaking down the oil film, forms shaft current, inducing electrolytic corrosion. This leads to defects such as pitting and grooves on the raceway, significantly shortening its lifespan. Statistics show that over 40% of motor failures originate from rolling bearings, with electrolytic corrosion being one of the main failure modes.

[0003] Under these operating conditions, the raceway needs to meet two core requirements: first, to optimize the contact state between the rolling elements and the raceway to reduce stress concentration; and second, to suppress electro-erosion damage. Currently, electro-erosion suppression is mostly an independent process, which suffers from low processing efficiency, cumbersome process connections, and high costs. Moreover, independent processing can easily affect the surface integrity of the raceway, making it difficult to balance processing accuracy and electro-erosion suppression effect. This fails to meet the high-efficiency and high-precision manufacturing requirements of high-end bearings. Therefore, an integrated method is urgently needed to solve the above pain points. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method and bearing for suppressing bearing electro-erosion, overcoming the technical defects of existing bearings that are susceptible to electro-erosion damage, have short service life, or have complex and costly anti-electro-erosion technologies.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a method for suppressing bearing electro-erosion, comprising the following steps: S1. Obtain the bearing components and disassemble them to obtain the bearing rings, cage and rollers. The bearing rings have raceway surfaces that mate with the rollers. S2. At least one annular linear groove is pre-made on the raceway surface using a scribing device, and the annular linear groove is coaxially arranged with the bearing ring. S3. Assemble the cage, rollers, and scribed bearing rings to obtain a bearing resistant to electrolytic corrosion.

[0006] As a preferred embodiment, in step S2, the number of annular linear grooves is two, and the two annular linear grooves are evenly distributed on the raceway surface.

[0007] As a preferred embodiment, the width of the annular linear groove is 0.1 mm and the depth is 0.05-0.1 mm.

[0008] As a preferred embodiment, the two annular linear grooves are an upper annular linear groove and a lower annular linear groove, respectively. The distance between the upper annular linear groove and the upper edge line of the raceway surface is the first distance, and the distance between the lower annular linear groove and the lower edge line of the raceway surface is the second distance. The first distance accounts for 1 / 3 of the width of the raceway surface, and the second distance accounts for 1 / 3 of the width of the raceway surface.

[0009] As a preferred embodiment, the cross-section of the annular linear groove is U-shaped, and the annular linear groove has two groove sidewalls, which are connected to the raceway surface by an arc.

[0010] As a preferred option, in step S2, after the scribing is completed, an ultrasonic cleaner is used to clean the bearing rings to remove iron filings and impurities generated during the scribing process.

[0011] As a preferred embodiment, the scribing device is a CNC precision scribing instrument. During the scribing process, the bearing ring is fixed by a three-jaw chuck, and the scribing area is cooled by coolant.

[0012] As a preferred embodiment, the bearing component is a tapered roller bearing.

[0013] As a preferred embodiment, the bearing ring includes an inner bearing ring and an outer bearing ring, and an annular linear groove is provided on the inner bearing ring and / or the outer bearing ring.

[0014] This application also provides a bearing, including bearing rings, a cage and rollers, wherein the bearing rings have raceway surfaces that mate with the rollers, and at least one annular linear groove is provided on the raceway surfaces.

[0015] The beneficial effects of this application are as follows: 1. This application does not require the use of existing anti-electro-erosion methods such as complex insulation treatment, bypass devices, material modification or coating technology. Electro-erosion suppression can be achieved simply by pre-fabricating annular linear grooves on the rolling surface of the bearing ring using a CNC precision scribing instrument. The process is simple and convenient to operate, and there is no need to invest a lot of equipment and manpower costs.

[0016] 2. In this application, an annular linear groove is prefabricated at a specific position on the rolling surface of the bearing ring. Due to stress concentration on both sides of the annular linear groove, it is in a mixed lubrication state, which preferentially causes electro-erosion and conductivity. Various positions on the surface of the bearing ring are in a parallel state. The conductivity on both sides of the annular linear groove can realize short-circuit protection for other positions on the surface of the bearing ring, thereby effectively suppressing electro-erosion damage.

[0017] 3. The annular linear groove of this application has two groove sidewalls, which are connected to the raceway surface by a circular arc. This avoids sharp edges from causing wear on the rolling elements and also avoids stress concentration. At the same time, it further optimizes the electric field distribution effect and enhances the ability to suppress electro-erosion.

[0018] 4. This application uses a three-jaw chuck to fix the bearing rings, preventing them from shifting. At the same time, coolant is used to cool the scribing area to prevent the heat generated during scribing from damaging the bearing ring material, ensuring that the original performance of the bearing rings is not affected.

[0019] 5. This application features two annular linear grooves. The symmetrical arrangement of the double annular linear grooves can orderly guide stray currents and shaft currents, avoid electric field accumulation in the core bearing area of ​​the raceway, and reduce micro-arc discharge. At the same time, the annular linear grooves can stably store and guide oil, maintain a uniform and complete lubrication and insulation film, and improve the oil film breakdown threshold.

[0020] 6. In this application, the distance between the upper annular linear groove and the edge line of the raceway surface is the first distance, and the distance between the lower annular linear groove and the lower edge line of the raceway surface is the second distance. The first distance accounts for 1 / 3 of the width of the raceway surface, and the second distance accounts for 1 / 3 of the width of the raceway surface. The 1 / 3 width layout precisely avoids the main contact area of ​​the rolling elements, so as to achieve the anti-electrolytic corrosion function while maintaining the integrity of the core bearing structure of the raceway, and taking into account the bearing rigidity and operating accuracy of the bearing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the collar of the present invention.

[0022] Figure 2 This is a cross-sectional view of the collar of the present invention.

[0023] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0024] Figure 4 This is a schematic diagram of the bearing inner ring in the comparative electro-erosion simulation test of this invention.

[0025] Figure 5 This is a schematic diagram of the roller and cage in the comparative electro-erosion simulation test of this invention.

[0026] Figure 6 This is a schematic diagram of the bearing outer ring in the comparative electro-erosion simulation test of this invention.

[0027] Figure 7 This is a schematic diagram of the bearing inner ring in the electro-erosion simulation test of the experimental group of this invention.

[0028] Figure 8 This is a schematic diagram of the roller and cage in the electro-erosion simulation test of the experimental group of this invention.

[0029] Figure 9 This is a schematic diagram of the bearing outer ring in the electro-erosion simulation test of the experimental group of this invention.

[0030] The diagram shows the following markings: 1. Bearing ring, 2. Raceway surface, 3. Annular linear groove, 31. Groove sidewall, 4. Arc. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Please see Figure 1-3 This invention provides a method for suppressing bearing electrolytic corrosion, comprising the following steps: S1. Obtain the bearing components and disassemble them to obtain the bearing ring 1, cage and rollers. The bearing ring 1 has a raceway surface 2 that mates with the rollers.

[0033] S2. At least one annular linear groove 3 is pre-fabricated on the raceway surface 2 using a scribing device. The annular linear groove 3 is coaxially arranged with the bearing ring 1. In step S2, there are two annular linear grooves 3, which are evenly distributed on the raceway surface 2 at intervals. The width of the annular linear groove 3 is 0.1 mm, and the depth is 0.05-0.1 mm. The two annular linear grooves 3 are an upper annular linear groove and a lower annular linear groove. The distance between the upper annular linear groove and the upper edge line of the raceway surface 2 is the first distance, and the distance between the lower annular linear groove and the lower edge line of the raceway surface 2 is the second distance. The first distance accounts for 1 / 3 of the width of the raceway surface 2, and the second distance accounts for 1 / 3 of the width of the raceway surface 2. The cross-section of the annular linear groove 3 is U-shaped, and the annular linear groove 3 has two groove sidewalls 31, which are connected to the raceway surface 2 by an arc 4.

[0034] The scribing device is a CNC precision scribing instrument. During the scribing process, the bearing ring 1 is fixed by a three-jaw chuck, and the scribing area is cooled by coolant. In step S2, after the scribing is completed, the bearing ring 1 is cleaned with an ultrasonic cleaner to remove iron filings and impurities generated during the scribing process.

[0035] S3. Assemble the cage, rollers, and scribed bearing rings 1 to obtain a bearing resistant to electrolytic corrosion.

[0036] The bearing ring 1 includes an inner bearing ring and an outer bearing ring, and an annular linear groove 3 is provided on the inner bearing ring and / or the outer bearing ring. The bearing component is a 32210 type tapered roller bearing.

[0037] This application also provides a bearing, including a bearing ring 1, a cage, and rollers. The bearing ring 1 has a raceway surface 2 that mates with the rollers, and at least one annular linear groove 3 is provided on the raceway surface 2. This application alters the electric field distribution on the rolling surface of the bearing ring 1 through the annular linear groove 3, blocking the continuous conduction of electro-erosion current, reducing the accumulation of electro-erosion energy, and thus suppressing the generation of electro-erosion damage. It should be noted that the annular linear groove 3 is preferably provided on the bearing ring 1 rotating during bearing operation.

[0038] This application sets up a control group and an experimental group, and conducts comparative tests on electrical erosion simulation under the same test conditions to verify the effectiveness of this application in suppressing bearing electrical erosion.

[0039] Bearing sample preparation: Two sets of 32210 type tapered roller bearings with smooth surfaces, no scratches, no wear, and no cracks were selected, with 10 sets of tapered roller bearings in each set. The two sets of tapered roller bearings were divided into a control group and a test group. All bearing samples were inspected using a precision diameter gauge and a roughness tester to ensure that the dimensional accuracy, surface roughness, and material composition of the bearings in the control group and the test group were completely consistent, and the dimensional tolerances conformed to GB / T307.1-2017 standard. The tapered roller bearings in the control group were not processed in any way to maintain the original smooth state of the rolling surface. The tapered roller bearings in the test group were used as test pieces for prefabricating the annular linear groove 3.

[0040] Prefabrication of Annular Linear Grooves 3 and Bearing Assembly: The 10 sets of tapered roller bearings in the test group were disassembled one by one, and the inner and outer rings of the bearings were removed. A CNC precision scribing instrument was used as the scribing device. During the scribing process, the bearing ring 1 was fixed by a three-jaw chuck to prevent the bearing inner ring from shifting. At the same time, coolant was used to cool the scribing area. The coolant was an emulsion to prevent the heat generated by scribing from damaging the bearing inner ring material. Two annular linear grooves 3 were prefabricated evenly on the rolling surface of the bearing inner ring. The annular linear grooves 3 were 0.1 mm wide and 0.05 mm deep, with a U-shaped cross-section. The two annular linear grooves 3 were the upper annular linear groove and the lower annular linear groove. The distance between the upper annular linear groove and the upper edge line of the raceway surface 2 was the first distance, and the distance between the lower annular linear groove and the lower edge line of the raceway surface 2 was the second distance. The first distance accounted for 1 / 3 of the width of the raceway surface 2, and the second distance accounted for 1 / 3 of the width of the raceway surface 2. After the annular linear groove 3 is prefabricated, the bearing inner ring is cleaned with an ultrasonic cleaner to remove iron filings and impurities. Then, in accordance with the assembly process of GB / T307.3-2017 standard, the bearing inner ring with the prefabricated annular linear groove 3 is assembled with the bearing outer ring, rollers, and cage to form a complete tapered roller bearing.

[0041] Experimental setup and execution: The tapered roller bearings of the control group and the experimental group were sequentially installed on the electro-erosion simulation testing machine, ensuring that the installation method and position were completely identical. The electro-erosion simulation testing machine consisted of a loading mechanism, a temperature sensor, an external carbon brush, a drive motor, and a control system. The loading mechanism was set to a load pressure of 500N, and the drive motor was set to a rotational speed of 1000r / min. External experimental instruments were set up, including a power amplifier, an oscilloscope, a signal generator, a data acquisition unit, and a data processing system. The signal generator produced simulated electro-erosion signals, the power amplifier amplified the signals, the oscilloscope observed the current and voltage waveforms in real time, and the data acquisition unit collected temperature, current, and voltage data in real time. Experimental parameters were set as follows: electro-erosion voltage 50V, electro-erosion current 0.1A, experimental time 100 hours, and ambient temperature controlled at 25±5℃. During the experiment, the parameters of the two tapered roller bearings were completely identical, and three parallel experiments were set up for each group to ensure experimental reliability.

[0042] Testing and Analysis: After the experiment, all tapered roller bearings in the comparison and test groups were disassembled, and a comprehensive inspection of the bearing inner ring, outer ring, rollers, and cage was conducted using a metallographic microscope, Rockwell hardness tester, and roughness tester. Combined with... Figure 4-9 As shown, the rolling surfaces of the outer and inner rings of the bearings in the control group showed obvious electrolytic pitting with a diameter of 0.1-0.3 mm and a decrease in surface hardness of 5-8 HRC. Slight electrolytic traces were also observed on the roller surface. In contrast, the rolling surfaces of the outer and inner rings of the bearings in the test group showed no obvious electrolytic pitting, only slight wear, and the surface hardness remained essentially unchanged. No electrolytic traces were observed on the rollers or cage.

[0043] Table 1 below shows the results of one set of comparative experiments.

[0044] Table 1

[0045] As shown in Table 1, the running time of the test group was 25 to 28 times that of the control group, and the test group showed significantly better inhibition of electro-erosion than the control group. This indicates that the annular linear groove 3 on the bearing rolling surface has an inhibitory effect on electro-erosion, which can greatly improve the bearing's resistance to electro-erosion and significantly reduce the degree of electro-erosion damage. Under the same experimental conditions, the service life of the bearing in the test group was about 25 to 28 times that of the control group, which fully verifies the effectiveness and superiority of the present invention.

[0046] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for suppressing bearing electrolytic corrosion, characterized in that, Includes the following steps: S1. Obtain the bearing components and disassemble the bearing components to obtain the bearing ring (1), cage and roller. The bearing ring (1) has a raceway surface (2) that is in contact with the roller. S2. At least one annular linear groove (3) is pre-made on the raceway surface (2) by a scribing device. The annular linear groove (3) is coaxially arranged with the bearing ring (1). S3. Assemble the cage, rollers and scribed bearing rings (1) to obtain an anti-electro-erosion bearing.

2. The method for suppressing bearing electrolytic corrosion according to claim 1, characterized in that, In step S2, there are two annular linear grooves (3), and the two annular linear grooves (3) are evenly distributed on the raceway surface (2).

3. The method for suppressing bearing electrolytic corrosion according to claim 1, characterized in that, The width of the annular linear groove (3) is 0.1 mm and the depth is 0.05-0.1 mm.

4. The method for suppressing bearing electrolytic corrosion according to claim 3, characterized in that, The two annular linear grooves (3) are the upper annular linear groove and the lower annular linear groove, respectively. The distance between the upper annular linear groove and the upper edge line of the raceway surface (2) is the first distance, and the distance between the lower annular linear groove and the lower edge line of the raceway surface (2) is the second distance. The first distance accounts for 1 / 3 of the width of the raceway surface (2), and the second distance accounts for 1 / 3 of the width of the raceway surface (2).

5. A method for suppressing bearing electrolytic corrosion according to claim 4, characterized in that, The cross-section of the annular linear groove (3) is U-shaped. The annular linear groove (3) has two groove sidewalls (31), which are connected to the raceway surface (2) by a circular arc (4).

6. A method for suppressing bearing electrolytic corrosion according to claim 5, characterized in that, In step S2, after the scribing is completed, the bearing ring (1) is cleaned with an ultrasonic cleaner to remove iron filings and impurities generated during the scribing process.

7. A method for suppressing bearing electrolytic corrosion according to claim 6, characterized in that, The scribing device is a CNC precision scribing instrument. During the scribing process, the bearing ring (1) is fixed by a three-jaw chuck, and the scribing part is cooled by coolant.

8. A method for suppressing bearing electrolytic corrosion according to claim 1, characterized in that, The bearing component is a tapered roller bearing.

9. A method for suppressing bearing electrolytic corrosion according to claim 7, characterized in that, The bearing ring (1) includes an inner bearing ring and an outer bearing ring, and an annular linear groove (3) is provided on the inner bearing ring and / or the outer bearing ring.

10. A bearing comprising bearing rings (1), a cage, and rollers, characterized in that, The bearing ring (1) has a raceway surface (2) that mates with the roller, and at least one annular linear groove (3) is provided on the raceway surface (2).

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