An electroresistive bearing for a specific wire drawing process of a rolling face and a method of manufacturing the same

Abstract

The application relates to an anti-electric corrosion bearing of a specific wire drawing process of a rolling working surface and a manufacturing method thereof, and belongs to the technical field of bearing machining. Through a customized wire drawing process and a single-side circulation machining path, wire drawing lines in the circumferential direction are formed on the rolling working surface of a bearing ring, the grease adhesion capacity and the electric insulation effect are effectively improved, the anti-electric corrosion performance of the bearing is greatly improved compared with conventional bearings, and the optimized wire drawing process and the super-precision process are integrated. The rolling working surface is improved in wear resistance through the cold deformation strengthening effect of wire drawing, and the structure damage caused by excessive machining is avoided through precise parameter control, so that the bearing simultaneously has excellent anti-electric corrosion performance and mechanical strength, can effectively resist the electric corrosion damage caused by shaft current, significantly prolongs the service life of the bearing, and meets the use requirements under high-frequency and high-pressure working conditions.

Description

Technical Field

[0001] This invention relates to the field of bearing processing technology, specifically to an anti-electro-erosion bearing with a specific wire drawing process on the rolling working surface and its manufacturing method. Background Technology

[0002] Rolling bearings are core components of high-end equipment such as variable frequency motors and new energy electric drive assemblies. The service performance of their rolling surfaces directly determines the operational stability and service life of the entire equipment. Under variable frequency pulse conditions, high-frequency common-mode voltage will induce shaft voltage on the motor shaft. When the amplitude of this voltage exceeds the insulation threshold of the lubricating grease film inside the bearing, it will break down the oil film and form a pulse shaft current. This will cause irreversible electrical erosion damage such as electro-erosion pits and longitudinal electro-erosion grooves on the raceway surface, ultimately leading to abnormal bearing noise, excessive vibration, or even premature seizure failure. This has long been a common and critical problem in the industry that restricts the long-term continuous operation of variable frequency equipment.

[0003] The current mainstream bearing anti-electro-optical corrosion technologies all have significant shortcomings: adding grounding brushes, conductive rings and other current-guiding devices at the system level can only divert the shaft current from the outside and cannot fundamentally improve the bearing's own anti-electro-optical corrosion resistance. Moreover, after long-term operation, new faults such as carbon brush wear and contact failure are prone to occur. On the other hand, at the bearing structure level, adopting modification solutions such as outer / inner ring insulating coatings and all-ceramic rolling elements not only involves complex processing technology and significantly increases manufacturing costs, but also easily changes the original fit accuracy and contact characteristics of the rolling pair. This leads to derivative problems such as poor compatibility with the rolling working surface and abnormal temperature rise under high-speed conditions, making it difficult to promote on a large scale in high-precision bearing scenarios. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an anti-electro-erosion bearing with a specific wire drawing process on the rolling working surface and its manufacturing method. By customizing the wire drawing process and using a single-sided cyclic processing path, a preset wire drawing pattern is formed on the rolling working surface of the bearing ring, which effectively improves the adhesion of grease and the insulation effect of the oil film. The anti-electro-erosion performance of the bearing is significantly improved compared with conventional bearings.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for manufacturing an anti-electro-erosion bearing with a specific wire drawing process on the rolling working surface includes the following steps: S1. Machin the bearing rings to a state ready for ultra-precision pretreatment; S2. Set the wire drawing process parameters: wire drawing depth: 1.0±0.5μm, wire drawing spacing: 0.6~1.6mm, wire drawing width: 0.2~0.4mm, and rotation speed ratio: the reciprocating stroke of the oilstone changes by 0.6~1.6mm for every 1 revolution of the workpiece. S3. Processing preparation: Oilstone selection: 1000~2000 mesh, cubic boron nitride superfine oilstone or sulfur-infiltrated white corundum oilstone; Processing equipment: Servo-driven programmable ultraprecision machine; Machining path: Single-sided loop path, that is, after the honing stone moves from the starting point A to the ending point B in one direction, it directly returns to point A in a fast idle stroke. The tool path is a one-way repeating loop of A→B and A→B. S4. Wire drawing ultra-precision machining: The bearing ring is clamped on the ultra-precision machine and the machining is started according to the set parameters and single-sided circulation path. The texture status is monitored in real time throughout the process. After the machining is completed, a preliminary cleaning is performed to remove debris and oil stains, and a bearing ring with a preset wire drawing texture on the rolling working surface is obtained. The preset wire drawing texture refers to the surface texture that is evenly distributed along the circumference of the bearing ring. S5. Assemble the bearing rings with matching parts to form the finished bearing.

[0006] Furthermore, in step S1, the bearing rings are rough-machined and semi-finished in sequence to remove machining allowances and ensure that the dimensional accuracy, roundness, and cylindricity of the rings meet the preset standards, thus reaching the state for ultra-precision pretreatment.

[0007] Furthermore, in step S2, the rotation speed ratio is set such that the reciprocating stroke of the oilstone changes by 0.9 mm for every one revolution of the workpiece.

[0008] Furthermore, the oilstone selected in step S3 requires isostatic pressing pressure ≥200MPa, microwave sintering temperature controlled at 1350±5℃, and overall density difference of the finished oilstone ≤0.05g / cm³ during the preparation process. 3 Meanwhile, the requirements are: the hardness difference between different parts of the oilstone ≤3HRC, the particle size 3σ deviation of the abrasive used in the oilstone ≤0.2μm, and the overall impurity content of the finished oilstone <50ppm.

[0009] Furthermore, the ultra-precision machine used for processing has servo drive programmable function, which can accurately set the workpiece speed, oilstone reciprocating oscillation frequency, reciprocating stroke and processing path through programming, ensuring that various process parameters can be executed stably.

[0010] Furthermore, the bearing rings refer to either the inner ring or the outer ring of the bearing.

[0011] Furthermore, the wire drawing ultra-precision machining described in step S4 refers to the integration of wire drawing technology into the ultra-precision machining of the bearing rolling working surface to form a synergistic machining process.

[0012] Further, step S5 specifically involves selecting parts that match the brushed bearing rings, cleaning, assembling, and lubricating them according to the bearing assembly process to ensure that each part fits tightly and rotates flexibly. During the assembly process, damage to the brushed texture of the rolling working surface is avoided, and finally, a complete anti-electro-erosion bearing product is assembled.

[0013] An anti-electro-erosion bearing with a specific wire drawing process on the rolling working surface is disclosed. The bearing is a rolling bearing and includes bearing rings, rolling elements, and a cage. The bearing is manufactured according to the anti-electro-erosion bearing manufacturing method described above. The rolling working surface of the bearing ring has uniformly distributed, non-overlapping wire drawing patterns along the circumference of the bearing ring.

[0014] Furthermore, the drawing depth of the brushed texture is 1.0±0.5μm, the drawing width is 0.2~0.4mm, and the drawing spacing is 0.6~1.6mm.

[0015] The present invention has at least the following beneficial effects.

[0016] 1. Significantly improve bearing electro-erosion performance and extend service life at a lower cost: This invention forms a preset circumferential pattern on the rolling working surface of the bearing ring through a customized wire drawing process and a single-sided cyclic processing path, which effectively improves the adhesion of grease and the insulation effect of the oil film. The anti-electro-erosion performance is more than 30 times better than that of conventional bearings. It can effectively resist electro-erosion damage caused by shaft current, greatly reduce the probability of premature bearing failure, and extend the equipment operation and maintenance cycle.

[0017] 2. Balancing anti-electro-erosion performance and mechanical properties, adapting to complex working conditions: The optimized wire drawing process and ultra-precision process of this invention are integrated into one, which not only improves the wear resistance of the rolling working surface through the strengthening effect of wire drawing cold deformation, but also avoids structural damage caused by over-processing through precise parameter control, so that the bearing has both excellent anti-electro-erosion performance and mechanical strength, and is suitable for high-frequency, high-voltage complex working conditions such as variable frequency motors.

[0018] 3. High process stability and controllable processing quality: By selecting suitable oilstones (1000~2000 mesh cubic boron nitride oilstone or sulfur-infiltrated white corundum oilstone), the consistency and uniformity of the wire drawing pattern are ensured, reducing processing defects such as burrs and pattern deviation, improving the quality stability during mass production, and reducing the defect rate.

[0019] 4. Strong process adaptability and controllable cost: This invention does not require the addition of complex processing equipment, but only the programming optimization of existing ultra-precision equipment. In addition, the selection of oilstones is compatible with the existing processing system, the process flow is simple, and it is easy to carry out industrial mass production.

[0020] 5. Wide range of applications and strong practicality: The manufacturing method of this invention can be widely applied to the processing of various rolling bearings, especially suitable for frequency conversion drive equipment with high requirements for the anti-electro-erosion performance of bearings. It does not require significant process adjustments for different bearing models, has strong versatility, and has extremely high industrial application value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a conventional wire drawing process.

[0022] Figure 2 This is a schematic diagram of the wire drawing process path of the present invention.

[0023] Figure 3 This is a diagram showing the brushed finish on the surface of the part after processing according to the present invention.

[0024] Figure 4 This is a disassembly diagram of the finished bearing group A after the electro-erosion performance test.

[0025] Figure 5 This is a disassembly diagram of the finished bearing group B after the electro-erosion performance test.

[0026] Attached reference numerals: 1 bearing ring, 2 rolling working surface, 3 oilstone position A, 4 oilstone position B. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] This invention discloses an anti-electro-erosion bearing with a specific wire drawing process on its rolling working surface and its manufacturing method. Through a customized wire drawing process and a single-sided cyclic processing path, a pre-set wire drawing pattern is formed on the rolling working surface 2 of the bearing raceway 1. This pre-set wire drawing pattern is a circumferential line pattern, that is, a surface texture pattern along the circumferential direction of the rolling working surface. This technical solution is based on the principle of specific electro-erosion technology discovered through research: research has found that the circumferential line of the bearing rolling working surface has a significant inhibitory effect on electro-erosion initiation. The surface texture pattern along the circumferential direction can guide the distribution of micro-electro-erosion along the circumferential direction, ultimately suppressing the generation of "washboard" patterns distributed along the longitudinal direction. Furthermore, this pattern is highly matched with the rolling element's movement direction, achieving comprehensive effects such as oil storage, oil gathering, and friction reduction without compromising the overall rigidity and contact of the raceway. During bearing operation, this pattern exhibits only minimal resistance fluctuations and has almost no impact on bearing operation. It should be noted that the spatial structure of the "washboard" pattern is characterized by its distribution along the longitudinal (axial) direction of the bearing parts (rings or rollers), forming an undulating spatial structure on the cross-section of the bearing parts. This pattern can significantly affect the vibration of the bearing during operation and inhibit its normal operation.

[0029] In addition, the surface texture along the circumferential direction has the following application advantages: (1) It is conducive to the formation of hydrodynamic lubrication. The rolling element rolls along the raceway circumferentially, and the circumferential texture can form a continuous micro-converging oil wedge, establishing a hydrodynamic oil film that is more stable than that of a smooth raceway, thus avoiding direct contact between the rolling element and the raceway. (2) It is conducive to the realization of oil storage and oil replenishment functions. The circumferential texture is a miniature oil reservoir. When the bearing rotates at high speed, the centrifugal force causes the lubricating oil to accumulate on the raceway working surface, and the texture continuously replenishes the contact area with oil; under low speed and start-stop conditions, the lubricating medium stored in the groove can maintain boundary lubrication, greatly reducing the phenomenon of oil exhaust wear.

[0030] Specifically, the implementation steps of a method for manufacturing an anti-electro-erosion bearing with a specific wire drawing process for the rolling working surface are as follows.

[0031] S1, process the bearing ring 1 to the state to be ultra-precision processed. First, rough and semi-finish the bearing ring 1 to remove the machining allowance and ensure that the ring size accuracy, roundness and cylindricity meet the preset standards; lay the foundation for the subsequent wire drawing process.

[0032] S2, which specifically parameterizes the effect of the wire drawing process on the rolling working surface 2 of the bearing.

[0033] The specific wire drawing process employed in this invention integrates the wire drawing process of the bearing rolling working surface 2 with the ultra-precision process, forming a collaborative processing procedure. This integrated process differs fundamentally from the wire drawing operation in conventional ultra-precision processes. Specifically, although conventional ultra-precision processes also employ wire drawing operations, the resulting textures are particularly dense and shallow. Testing shows that the depth of conventional wire drawing textures is approximately 0.2 μm, and the width is approximately 0.4 μm. Such textures are mainly used to improve surface quality and provide a certain oil retention function, but cannot reliably improve anti-electro-erosion performance.

[0034] The parameter design of the circumferential groove pattern in the specific wire drawing process of this invention requires comprehensive evaluation of experimental parameters, lubrication, and machining feasibility. Firstly, the circumferential groove depth needs to be set. Groove depth is a crucial indicator of the circumferential groove structure. For bearing raceways, excessive groove depth can affect the dynamic accuracy of the bearing during operation, while insufficient groove depth can lead to poor oil film adhesion and inadequate anti-electro-erosion performance. Based on the core requirement of anti-electro-erosion performance, this invention, through experimental verification, has developed suitable wire drawing process parameters, with a recommended wire drawing depth between 1.0 ± 0.5 μm. Secondly, the circumferential groove wire drawing width needs to be set. Excessive groove width can affect the dynamic accuracy of the bearing during operation, while insufficient groove width can lead to poor oil film adhesion and inadequate anti-electro-erosion performance. Based on the core requirement of anti-electro-erosion performance, this invention, through experimental verification, has developed suitable wire drawing process parameters, with a recommended wire drawing width between 0.2 and 0.4 mm. Finally, the circumferential groove spacing is set, taking into account the structural compatibility requirements of bearing friction performance and load-bearing performance. Referring to the spacing parameters of conventional wire drawing processes, the wire drawing spacing is set to 0.6~1.6mm. Through simulation analysis, simulation experiments, and combined with industry application experience, the above parameters can ensure the structural strength of the rolling working surface and form a stable anti-electro-erosion surface layer.

[0035] To achieve stable fabrication of the circumferential textured surface of the bearing rolling surface proposed in this invention, a specific processing technology needs to be developed. While precision laser microtexturing offers high accuracy and controllable parameters, it is very costly. For example, processing a complete set of outer and inner raceways for a 32210 tapered roller bearing according to set parameters takes approximately 24 hours and costs over 20,000 yuan, making it uneconomical. Furthermore, laser processing generates microscopic damage and deposits on the working surface, which are extremely difficult to remove later. Electrical discharge machining (EDM) has similar characteristics to precision laser microtexturing and is not recommended. Ultimately, this invention selects a specific wire-drawing ultra-precision process that can be integrated with ultra-precision machining and achieves precision cutting of microscopic circumferential textures. This integrates the wire-drawing process and ultra-precision process of the bearing rolling surface 2 into a collaborative processing procedure.

[0036] S3, preparations before the ultra-precision wire drawing process.

[0037] S301, Development and Preparation of Precision and Stable Cutting Oilstones. The ultra-precision oilstone selected in this invention focuses on the stable realization of the wire drawing process. Through repeated experiments and verification, it is necessary to use a type of oilstone with good sharpness retention, relatively coarse particle size, and moderate hardness. The oilstones selected in this invention are recommended to be 1000~2000 mesh, with medium hardness, and the preferred material is cubic boron nitride (CBN) oilstone or white corundum (WA) oilstone produced by sulfurizing process.

[0038] The core of the development of the precision and stable cutting oilstone adapted to the ultra-precision wire drawing process of this invention lies in the optimization of abrasive and formulation selection, binder and structural design, forming and sintering process, and control of hardness uniformity. This ensures dimensional consistency and surface quality during ultra-precision machining of high-hardness bearing steel from the consumables perspective. Regarding abrasive and formulation selection, CBN oilstones or white corundum (WA) oilstones with sulfurizing processes are preferred for iron-based bearing steel to achieve sharp ultra-precision machining performance. For binder selection, ceramic binders with excellent shape retention are recommended. Regarding abrasive grit selection, breaking away from the conventional thinking of selecting 3000-9000 mesh grit for ultra-precision oilstones, repeated experiments have confirmed that using oilstones in the 1000-2000 mesh grit range is necessary to achieve stable and precise circumferential texture cutting.

[0039] The key preparation process for this type of ceramic-based CBN / WA asphalt is as follows: mixing → cold pressing → heat treatment and sintering → low-temperature wax filling → precision dimensional machining. Sulfurization treatment is applied after cold pressing and sintering to achieve an anti-sticking effect. The high-precision control requirements for the entire process are: isostatic pressing pressure ≥ 200 MPa, microwave sintering temperature controlled at 1350 ± 5℃, and overall density difference of the finished asphalt ≤ 0.05 g / cm³. 3 Regarding the core stability key indicator, the hardness of the oilstone must be uniform: the hardness difference between different parts of the oilstone must be ≤3HRC, otherwise it will cause defects such as uneven roughness and scratches on the workpiece; the supporting full-chain quality control requirements are: the particle size 3σ deviation of the abrasive used in the oilstone is ≤0.2μm, and the overall impurity content of the finished oilstone is <50ppm, so as to avoid processing defects caused by abnormal abrasive particles and impurities from the source.

[0040] S302, the precision shaft texture uses specific wire drawing process parameters.

[0041] The stable achievement of precision circumferential texture in bearing ultra-precision machining relies on the synergy of specialized process technologies, including high-frequency oscillating oilstone precision composite motion, pressure adaptive control, and a low-heat micro-cutting precision circumferential wire drawing mechanism. Regarding the high-frequency oscillating oilstone precision composite motion, the process parameters employed emphasize the stable achievement of the wire drawing process on the rolling working surface of the bearing rings. Strict control of the ratio between the workpiece rotation speed and the reciprocating oscillation frequency of the oilstone is required. Specifically, the ratio of workpiece rotation speed to oilstone reciprocating oscillation should match the desired wire spacing. The wire drawing effect is as follows: the recommended wire drawing depth is between 1.0 ± 0.5 μm, the optimal wire spacing is 0.6~1.6 mm, and the width is 0.2~0.4 mm. Converted to rotation speed ratio, this means that for every one revolution of the workpiece rotation speed, the oilstone reciprocating stroke changes by 0.6~1.6 mm.

[0042] S303, Developing a specific wire drawing path. The wire drawing process path used in this invention differs significantly from that of conventional ultra-precision wire drawing processes, which is one of the key improvements in achieving enhanced resistance to electrolytic corrosion. For example... Figure 1-2 As shown, during bearing wire drawing, the bearing ring 1 is mounted on the equipment and rotates as a workpiece. Simultaneously, the honing stone moves between positions A3 and B4 to draw the rolling working surface 2. Conventional ultra-precision wire drawing processes often employ a cyclic covering path, i.e., an ABAB reciprocating cyclic path, such as... Figure 1 After the oilstone moves from point A to point B, without lifting the tool, it moves back to point A along the original path, repeating the A→B→A cycle. This continuous reciprocating motion between points A and B easily leads to intersecting and overlapping brushed lines, disrupting the consistency of the surface texture and affecting oil film adhesion and anti-electrolytic corrosion effects. This invention explicitly requires a single-sided loop path, i.e., a repeated AB path, such as... Figure 2 As shown, after the oilstone moves unidirectionally from the starting point A to the ending point B, it directly and quickly returns to point A. The tool path is a unidirectional repeating cycle of A→B and A→B. This path can ensure that the wire drawing pattern is consistent in direction and evenly distributed, forming a regular unidirectional texture structure. This can not only improve the grease retention capacity, but also enhance the density of the surface layer, thereby improving the anti-electrolytic corrosion performance.

[0043] S304. The implementation of specific wire drawing process parameters and paths requires specific programmable ultra-precision equipment. Since this invention requires precise control of wire drawing parameters and customized processing of single-sided cyclic paths, the selected ultra-precision equipment must have servo-driven programmable functionality. This allows for precise setting of workpiece rotation speed, honing stone reciprocating oscillation frequency, reciprocating stroke, and processing path through programming, ensuring stable execution of various process parameters and avoiding human error. Simultaneously, the ultra-precision equipment must possess high motion accuracy and stability to effectively control vibration during processing, preventing defects such as texture misalignment and burrs, and guaranteeing the processing quality of the ultra-precision wire drawing process.

[0044] The S305 employs specific precision rotation and control technology. The selected ultra-precision equipment utilizes a vertical servo spindle or electric spindle structure for its precision rotation module, avoiding belt drives and ensuring smooth rotation and concentricity. The pressurization control system employs pneumatic stepless pressure regulation technology, achieving flexible pressure application of the honing stone to the workpiece, avoiding texture defects caused by rigid pressure. The lubrication and cooling system uses high-precision filtered coolant, continuously flushing the working surface during processing, rapidly cooling it, and forming a uniform lubricating film to prevent residual abrasive debris from scratching the texture. At the CNC system level, a microsecond-level synchronous control bus is used, with built-in vibration suppression algorithms and high-frequency notch filtering functions to eliminate abnormal vibrations in real time, preventing workpiece roundness and waviness from exceeding tolerances. It also features real-time monitoring and dynamic compensation for honing stone wear, along with dual-station roughing / ultra-precision / ultra-precision processing or independent control technology for roughing / ultra-precision / ultra-precision processes, achieving a stable closed-loop control system for machining accuracy across all processes.

[0045] S4. Complete the pre-set wire drawing process on the designated ultra-precision equipment. Install the prepared bearing ring 1 on the qualified ultra-precision equipment. Start the equipment for ultra-precision wire drawing according to the pre-set process parameters (wire drawing depth, wire drawing spacing, speed ratio) and a single-sided circulating processing path. During processing, monitor the processing status in real time and adjust the equipment operating parameters promptly to ensure the wire drawing pattern meets the pre-set standards. After processing, perform preliminary cleaning of the bearing ring 1 to remove surface processing debris and oil stains, resulting in a bearing ring 1 with a pre-set wire drawing pattern on the rolling working surface 2. This pre-set wire drawing pattern is a unidirectional wire drawing texture structure that is evenly distributed along the circumference of the bearing ring 1, without intersections or overlaps.

[0046] The precision circumferential texture obtained from ultra-precision machining of bearings is inspected using a method that primarily employs stylus profilometry supplemented by scanning electron microscopy (SEM). The focus is on quantifying core indicators such as texture uniformity and surface roughness. Key operational and standard implementation points include: sampling length covering the entire raceway surface; taking measurements at multiple locations along the raceway and averaging the results to avoid localized errors interfering with the test results; strict temperature control within ±1℃ in the testing environment to prevent false textures caused by workpiece thermal deformation leading to misjudgments; and strict adherence to surface structure standards such as GB / T 3505 and ISO 4287 throughout the entire process to ensure compliant and traceable test results.

[0047] S5. Assemble the bearing parts into a finished bearing. Select rolling elements, cages, seals, and other parts that match the brushed bearing ring 1. Perform cleaning, assembly, and lubrication operations according to conventional bearing assembly processes to ensure that all parts fit tightly and rotate flexibly. Avoid damaging the brushed texture of the rolling working surface 2 during assembly. Finally, assemble a complete anti-electro-erosion bearing.

[0048] Finally, the bearings treated with the specific wire drawing process were subjected to electro-erosion performance testing. Using specialized electro-erosion performance testing equipment, the bearings were simulated under variable frequency operating conditions during actual operation. The electro-erosion performance of the finished bearings was tested, and bearings of the same model processed using conventional methods were selected as a control group for comparative testing to verify the anti-electro-erosion performance and effectiveness of the specific wire drawing process of this invention.

[0049] The present invention will now be described in detail through exemplary embodiments. It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains.

[0050] Example 1

[0051] 1. Pretreatment of bearing rings.

[0052] Tapered roller bearing rings are selected and subjected to roughing and semi-finishing processes in sequence to thoroughly remove surface oxide scale, burrs, and machining allowances. The dimensional accuracy, roundness, and cylindricity are controlled within the GB / T307.1 standard P5 level to reach the state of being ready for ultra-precision pretreatment.

[0053] 2. Setting of wire drawing process parameters.

[0054] Drawing depth: 1.0±0.5μm.

[0055] Wire drawing width: 0.2~0.4mm.

[0056] Wire drawing spacing: 0.6~1.6mm.

[0057] Rotation speed ratio: For every revolution of the workpiece, the reciprocating stroke of the oilstone changes by approximately 0.9 mm.

[0058] 3. Processing preparation.

[0059] Oilstone selection: 1000~2000 mesh, CBN superfine oilstone or sulfur-infiltrated white corundum oilstone, medium hardness, with a balance between sharpness retention and self-sharpening properties.

[0060] Processing equipment: servo-driven programmable ultra-precision machine, which can precisely control the speed, oscillation frequency and processing path.

[0061] Processing path: Single-sided loop path (A→B, A→B repeats) to avoid overlapping and intersecting textures.

[0062] 4. Ultra-precision wire drawing.

[0063] The pre-treated bearing rings are clamped on an ultra-precision machine, and machining is started according to the set parameters and path. The texture is monitored in real time throughout the process. After machining, the rings are cleaned with industrial cleaning agent to remove debris and oil, resulting in bearing rings with regular unidirectional brushed texture. The brushed effect is as follows: Figure 3 As shown.

[0064] 5. Assemble the bearing parts into a finished bearing.

[0065] Match rolling elements of the same specifications, demagnetize, clean, and assemble according to standard processes, and avoid scratching the wire drawing surface during assembly.

[0066] 6. Perform electro-erosion performance tests on the treated bearings.

[0067] Using professional electro-erosion performance testing equipment, the electro-erosion performance of the finished bearing manufactured in Embodiment 1 of this invention (defined as Group B, as the test group) was tested to simulate the variable frequency working conditions of the bearing in actual operation. At the same time, the same type of bearing processed by conventional process was selected as the control group (defined as Group A, as the comparison group) for comparative testing.

[0068] The bearings of groups A and B, which had undergone the same electro-erosion simulation test time, were disassembled, such as... Figure 4-5 As shown, where, Figure 4 The disassembly diagrams of the inner ring, rollers, and outer ring of the finished bearing group A are shown from top to bottom. Figure 5 The disassembly diagrams of the finished bearing group B, from top to bottom, show the inner ring, rollers, and outer ring. As can be seen from the diagrams, after the electro-erosion test... Figure 4 The roller surfaces of the finished bearings in group A exhibit distinct longitudinal striations, a typical "washboard" characteristic after bearing electro-erosion. Figure 5 The roller surface of the B group of finished bearings exhibits circumferential texture, which is consistent with... Figure 4 The texture of the roller surface is completely different from that of the other two in terms of spatial structure.

[0069] Measurement using a white light interferometer Figure 4 The cross-section of the rollers can be verified to be a undulating spatial structure. When the bearing is running, this undulating structure will inevitably cause the bearing to vibrate, which is the core source of electrolytic corrosion. Figure 5 In the case of the rollers, the cross-sectional shape of the rollers is smooth and without undulations. For the operation of the bearing, this smooth circumferential pattern will not cause vibration damage.

[0070] From the results, longitudinal electro-erosion marks are undulating grooves extending along the axial (longitudinal) direction, with the groove orientation nearly perpendicular to the circumferential movement direction of the rolling element. Circumferential patterns, on the other hand, are textures extending along the circumferential direction. Since they have opposite spatial structures, in principle, the spatial structure of the circumferential pattern should suppress the longitudinal pattern. In this application, the circumferential texture generated by a specific wire drawing process induces the generation of circumferential patterns and suppresses longitudinal electro-erosion marks. In other words, when bearing electro-erosion occurs, the pre-formed circumferential wire drawing texture on the rolling surface induces the electro-erosion marks to develop in a harmless circumferential direction, disrupting the conditions that would otherwise easily generate circumferential undulating patterns. This suppresses the spatial structure of the longitudinal pattern from the forming path, preventing bearing electro-erosion. Figure 4 The image shows harmful longitudinal electrical erosion patterns that can induce vibrations.

[0071] Table 1. Electro-erosion simulation experimental data of finished bearings, Group A and Group B

[0072] Table 1 above summarizes the experimental data of the comparative test of electro-erosion performance. Group A showed abnormal signals after 50-90 hours of operation, and the disassembly results showed that there were many severe electro-erosions. Group B, on the other hand, showed abnormal signals after 1650-2700 hours of operation, and the disassembly results showed that there were only a few minor electro-erosions.

[0073] The test results of the comparative experiment show that the bearing manufactured by this invention has more than 30 times the resistance to electro-erosion compared with conventional bearings. It can effectively resist electro-erosion damage caused by shaft current, significantly extend the service life of the bearing, and meet the needs of use under high frequency and high voltage conditions.

[0074] It should be noted that although the present invention has been described through the above embodiments, the present invention may have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A method for manufacturing an anti-electro-erosion bearing using a specific wire drawing process on the rolling working surface, characterized in that, Includes the following steps: S1. Machin the bearing rings to a state ready for ultra-precision pretreatment; S2. Set the wire drawing process parameters: wire drawing depth: 1.0±0.5μm, wire drawing spacing: 0.6~1.6mm, wire drawing width: 0.2~0.4mm, and rotation speed ratio: the reciprocating stroke of the oilstone changes by 0.6~1.6mm for every 1 revolution of the workpiece. S3. Processing preparation: Oilstone selection: 1000~2000 mesh, cubic boron nitride superfine oilstone or sulfur-infiltrated white corundum oilstone; Processing equipment: Servo-driven programmable ultraprecision machine; Machining path: Single-sided loop path, that is, after the honing stone moves from the starting point A to the ending point B in one direction, it directly returns to point A in a fast idle stroke. The tool path is a one-way repeating loop of A→B and A→B. S4. Wire drawing ultra-precision machining: The bearing ring is clamped on the ultra-precision machine and the machining is started according to the set parameters and single-sided circulation path. The texture status is monitored in real time throughout the process. After the machining is completed, a preliminary cleaning is performed to remove debris and oil stains, and a bearing ring with a preset wire drawing texture on the rolling working surface is obtained. The preset wire drawing texture refers to the surface texture that is evenly distributed along the circumference of the bearing ring. S5. Assemble the bearing rings with matching parts to form the finished bearing.

2. The method for manufacturing an anti-electro-erosion bearing according to claim 1, characterized in that, In step S1, the bearing rings are rough-machined and semi-finished in sequence to remove machining allowances and ensure that the dimensional accuracy, roundness, and cylindricity of the rings meet the preset standards, thus reaching the state for ultra-precision pretreatment.

3. The method for manufacturing an anti-electro-erosion bearing according to claim 1, characterized in that, In step S2, the rotation speed ratio is set such that the reciprocating stroke of the oilstone changes by 0.9 mm for every one revolution of the workpiece.

4. The method for manufacturing an anti-electro-erosion bearing according to claim 1, characterized in that, The oilstone selected in step S3 requires isostatic pressing pressure ≥200MPa, microwave sintering temperature controlled at 1350±5℃, and overall density difference of the finished oilstone ≤0.05g / cm³ during preparation. 3 Meanwhile, the requirements are: the hardness difference between different parts of the oilstone ≤3HRC, the particle size 3σ deviation of the abrasive used in the oilstone ≤0.2μm, and the overall impurity content of the finished oilstone <50ppm.

5. The method for manufacturing an anti-electro-erosion bearing according to claim 1, characterized in that, The ultra-precision machine used for processing has servo drive programmable function, which can accurately set the workpiece speed, oilstone reciprocating oscillation frequency, reciprocating stroke and processing path through programming, ensuring that various process parameters can be executed stably.

6. The method for manufacturing an anti-electro-erosion bearing according to claim 1, characterized in that, The bearing rings refer to either the inner or outer ring of the bearing.

7. The method for manufacturing an anti-electro-erosion bearing according to claim 1, characterized in that, The wire drawing ultra-precision machining mentioned in step S4 refers to the integration of wire drawing technology into the ultra-precision machining of the bearing rolling working surface to form a synergistic machining process.

8. The method for manufacturing an anti-electro-erosion bearing according to claim 1, characterized in that, Step S5 specifically involves selecting parts that match the brushed bearing rings, cleaning, assembling, and lubricating them according to the bearing assembly process to ensure that all parts fit tightly and rotate flexibly. During the assembly process, damage to the brushed texture of the rolling working surface should be avoided, and finally, a complete anti-electro-erosion bearing product is assembled.

9. A bearing resistant to electro-erosion with a specific wire drawing process on the rolling working surface, characterized in that, The bearing is a rolling bearing, comprising bearing rings, rolling elements and a cage, and is manufactured by the anti-electro-erosion bearing manufacturing method according to any one of claims 1-8. The rolling working surface of the bearing ring has uniformly distributed, non-overlapping brushed lines along the circumferential direction of the bearing ring.

10. The anti-electro-erosion bearing according to claim 9, characterized in that, The drawing depth of the brushed texture is 1.0±0.5μm, the drawing width is 0.2~0.4mm, and the drawing spacing is 0.6~1.6mm.

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