Forming method of bearing retainer

Abstract

The invention discloses a forming method of a bearing retainer, which comprises the following steps: providing a pipe blank, carrying out cold drawing forming on the pipe blank, and reserving machining allowance; the pipe obtained after drawing forming is cut into an annular part, and the cutting length of the annular part is controlled to be the design width of the bearing retainer; a plurality of ball pockets are cut in the annular part through laser cutting, and the finish machining allowance is reserved; and composite finish machining is conducted on the annular part, and the finished bearing retainer is obtained. According to the forming method, excess materials are reduced through the pipe drawing process, waste stamping is avoided through the laser cutting process, and therefore the utilization rate of raw materials is greatly increased. The drawing process ensures uniform wall thickness, and can eliminate accumulative errors in cooperation with subsequent composite finish machining, so that the machining process is improved. And multiple procedures such as stamping and drilling are simplified into three steps of drawing, cutting and finish machining, so that the machining efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly to a forming method for a bearing cage. Background Art

[0002] In the field of mechanical manufacturing, the bearing cage has a significant impact on the performance of the bearing, and its quality is related to the rotational accuracy, smoothness, service life, and load-bearing capacity of the bearing. With the development of modern industry, the requirements for the accuracy and performance of the bearing cage are constantly increasing, and an efficient and accurate forming method for the bearing cage is becoming increasingly important.

[0003] The existing forming processes for bearing cages mainly have problems such as low material utilization rate, complex processes, and insufficient accuracy. For example, in the traditional sheet metal stamping process, the material utilization rate is less than 11%, and multiple stampings result in a large deviation in the position degree of the pocket holes (typical error ≥ 0.1 mm). Additionally, multiple finishing processes are required, the dimensional accuracy fluctuates greatly, and the die design is complex. In the bar turning process, the raw material removal rate is as high as 70%, the processing cycle is long, thin-walled structures are prone to deformation during turning, the roundness error is large, the process is complex, and the equipment investment cost is high. The casting forming process requires additional risers to be set, the surface quality is poor, and additional grinding processes are required later. These problems severely limit the production efficiency and quality improvement of bearing cages, making it difficult to meet the requirements of modern industry for high-end bearings and urgently needing improvement. Summary of the Invention

[0004] The main object of the present invention is to propose a forming method for a bearing cage with high material utilization rate, simplified processes, and improved machining accuracy.

[0005] To achieve the above object, the present invention proposes a forming method for a bearing cage, including:

[0006] Providing a pipe blank, subjecting the pipe blank to cold drawing forming, and reserving a machining allowance;

[0007] Cutting the drawn pipe into a ring-shaped part, and controlling the cutting length of the ring-shaped part to be the designed width of the bearing cage;

[0008] Using laser cutting to cut a plurality of ball pockets on the ring-shaped part, and reserving a finishing allowance;

[0009] Performing composite finishing on the ring-shaped part to obtain the finished bearing cage.

[0010] Optionally, the step of providing a pipe blank, subjecting the pipe blank to cold drawing forming, and reserving a machining allowance includes:

[0011] Providing a pipe blank, and subjecting the pipe blank to multi-mode continuous drawing forming.

[0012] Optionally, in the step of providing the pipe blank and subjecting the pipe blank to multi-mode continuous drawing forming, the pass deformation amount of the multi-mode continuous drawing forming of the pipe blank is controlled to be greater than or equal to 8% and less than or equal to 12%.

[0013] Optionally, the step of subjecting the annular part to compound finishing to obtain the finished bearing cage includes:

[0014] Taking one end face of the annular part as a reference, turning the other end face to the designed thickness, and precisely turning the inner hole to the target size;

[0015] Taking the processed end face and inner hole as references, turning the outer circle to the target size;

[0016] Precisely trimming the pocket to the target size and ensuring that the roughness of the ball contact surface meets the design requirements.

[0017] Optionally, the step of precisely trimming the pocket to the target size and ensuring that the roughness of the ball contact surface meets the design requirements includes:

[0018] Adopting electrochemical machining to precisely trim the pocket to the target size and ensuring that the roughness of the ball contact surface meets the design requirements.

[0019] Optionally, the step of precisely trimming the pocket to the target size and ensuring that the roughness of the ball contact surface meets the design requirements includes:

[0020] Using a CNC milling machine for machining, precisely trimming the pocket to the target size and ensuring that the roughness of the ball contact surface meets the design requirements. During the machining process, through the A / C axis linkage, ensure that the perpendicularity between the pocket axis and the end face is less than 3μm / mm.

[0021] Optionally, the step of precisely trimming the pocket to the target size and ensuring that the roughness of the ball contact surface meets the design requirements includes:

[0022] Using a CNC milling machine to rough mill the pocket, and controlling the cutting amount to be less than or equal to 0.25mm;

[0023] Using a CNC milling machine to finish mill the pocket, and controlling the cutting amount to be less than or equal to 0.05mm.

[0024] Optionally, in the step of providing the pipe blank, subjecting the pipe blank to cold drawing forming and reserving machining allowance, the wall thickness of the pipe after drawing forming is D1, and the designed wall thickness of the bearing cage is D2. D1 - D2 is greater than or equal to 0.8mm and less than or equal to 1.2mm.

[0025] Optionally, in the step of cutting the drawn pipe into an annular part and controlling the cutting length of the annular part to be the designed width of the bearing cage, the tolerance between the cutting length of the annular part and the designed width of the bearing cage is controlled within ±0.05 mm.

[0026] Optionally, in the step of using laser cutting to cut a plurality of ball pockets on the annular part and leaving a finishing allowance, the aperture consistency error of the plurality of ball pockets is less than or equal to 0.02 mm.

[0027] The present invention provides a forming method for a bearing cage. The forming method includes the following steps: providing a pipe blank, performing cold drawing on the pipe blank and leaving a machining allowance; cutting the drawn pipe into an annular part and controlling the cutting length of the annular part to be the designed width of the bearing cage; using laser cutting to cut a plurality of ball pockets on the annular part and leaving a finishing allowance; performing composite finishing on the annular part to obtain the finished bearing cage.

[0028] In the embodiment provided by the present invention, by adopting this forming method, the use of the pipe drawing process reduces the surplus material, and the laser cutting process avoids stamping waste, thereby greatly improving the utilization rate of raw materials. The drawing process ensures uniform wall thickness. Cooperating with the subsequent composite finishing, it can eliminate the cumulative error, thereby improving the processing technology. Simplifying multiple processes such as stamping and drilling into three steps of drawing - cutting - finishing improves the processing efficiency. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 Schematic diagram of the three - dimensional structure of the bearing cage;

[0031] Figure 2 Process flow chart of the first embodiment of the forming method for the bearing cage provided by the present invention;

[0032] Figure 3 Process flow chart of the second embodiment of the forming method for the bearing cage provided by the present invention;

[0033] Figure 4 Schematic comparison table between the forming method for the bearing cage provided by the present invention and the traditional process.

[0034] Explanation of the attached reference numerals:

[0035] Reference numeral Name Reference numeral Name 100 Bearing cage 10 Pocket 20 End face

[0036] The realization, functional features, and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0037] It should be noted that if there are directional indications involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B simultaneously.

[0039] The present invention provides a forming method for a bearing cage. Please refer to Figure 1 , in the embodiment provided by the present invention, the structure of the bearing cage 100 is as Figure 1 shown. It is generally annular and has two end faces 20 arranged oppositely in the axial direction. A plurality of pocket holes 10 are provided on the circumferential side of the bearing cage 100, and the plurality of pocket holes 10 are spaced apart in the circumferential direction. The bearing cage 100 is preferably applied to precision cages such as cylindrical roller bearings and tapered roller bearings, and the forming method provided by the present invention is particularly suitable for the mass production of these precision bearing cages.

[0040] As Figure 2 shown, the present invention provides a first embodiment of a forming method for a bearing cage. Specifically, in this embodiment, the forming method includes the following steps:

[0041] Step S1: Provide a pipe blank, perform cold drawing forming on the pipe blank, and reserve machining allowance.

[0042] In this step, cold drawing forming utilizes the plastic deformation characteristics of metal in the cold state. By applying tensile force to the pipe through a drawing die, plastic deformation occurs to the pipe in the die, thereby achieving changes in dimensions and shape. The reserved machining allowance is for more precise control of dimensional accuracy in the subsequent process. In specific applications, according to the design requirements of the bearing cage to be produced, the pipe blank can be selected within a certain range of materials and dimensions. It is preferred to select a material suitable for the cold drawing process, such as DD13 cold drawn steel pipe (chemical composition: C≤0.8%, Mn≤0.40%, P≤0.017%). It can be understood that the wall thickness dimension and outer diameter of the pipe blank should be larger than the finished bearing cage to be preformed. In the cold drawing process, the parameters of the drawing equipment, such as drawing speed, drawing force, etc., can be adjusted according to the material and specifications of the pipe to optimize the drawing effect.

[0043] The pipe after drawing forming should have a machining allowance reserved. Preferably, the wall thickness of the pipe after drawing forming is D1, and the designed wall thickness of the bearing cage is D2, and D1 - D2 is greater than or equal to 0.8 mm and less than or equal to 1.2 mm to facilitate subsequent processing. In this way, by reserving sufficient machining allowance, the wall thickness of the bearing cage can be precisely controlled in the subsequent processing. Reserving a machining allowance of 0.8 mm - 1.2 mm is considered because in subsequent processing steps such as turning and grinding, further processing of the pipe is required to meet the designed wall thickness and accuracy requirements of the bearing cage. If the machining allowance is too small, the accuracy requirements may not be met; if the machining allowance is too large, the processing cost and processing time will increase. A reasonable machining allowance can not only ensure machining accuracy but also improve production efficiency, reduce production costs, and ensure the stable and reliable quality of the bearing cage.

[0044] To ensure the uniformity of the pipe wall thickness, in an alternative embodiment, step S1 specifically includes: supplying the pipe raw material and performing multi-mode continuous drawing forming on the pipe raw material. In this embodiment, in the step of cold drawing forming, the pipe raw material is processed by means of multi-mode continuous drawing. Multi-mode continuous drawing means that the pipe sequentially passes through multiple drawing dies with different specifications and gradually reaches the target dimensions and shape during the continuous drawing process. In this way, based on the principle of continuous plastic deformation of metal, through the gradual action of multiple dies, the pipe undergoes plastic deformation with a smaller deformation amount each time during the continuous drawing process, thereby better controlling the deformation uniformity of the pipe and making the wall thickness of the drawn pipe more uniform. Compared with single-mode drawing, multi-mode continuous drawing can reduce the deformation amount of a single drawing, reduce the drawing force, thereby improving the stability of the drawing process and the quality of the pipe. At the same time, the continuous drawing method improves production efficiency, reduces processing time, and further enhances the overall production efficiency.

[0045] Preferably, the pass deformation amount in multi-mode continuous drawing forming is controlled to be greater than or equal to 8% and less than or equal to 12%. The pass deformation amount refers to the relative change in the cross-sectional area of the pipe after passing through a drawing die. In this embodiment, during the multi-mode continuous drawing forming process, strictly controlling the deformation amount of each pass within the range of 8%-12% can not only ensure that the pipe has sufficient deformation amount during the drawing process to gradually reach the target size, but also avoid excessive internal stress generated inside the pipe due to excessive deformation amount, thus causing defects such as cracking and uneven deformation of the pipe. At the same time, reasonable control of the pass deformation amount can make the drawing process more stable, which is beneficial to improving the service life of the drawing die and reducing production costs. In this embodiment, by precisely controlling the pass deformation amount, the dimensional accuracy and wall thickness uniformity of the drawn pipe can be ensured, providing a good foundation for subsequent processing and further improving the quality of the bearing cage.

[0046] Step S2: Cut the drawn pipe into annular parts, and control the cutting length of the annular parts to be the designed width of the bearing cage.

[0047] In this step, preferably, the tolerance between the cutting length of the annular part and the designed width of the bearing cage is controlled within ±0.05 mm, so as to ensure the accuracy of the bearing cage in the axial dimension. In specific applications, high-precision cutting equipment such as precision wire cutting machines and laser cutting machines can be used, and the parameters of the cutting equipment such as cutting speed and cutting current can be precisely adjusted to ensure the cutting accuracy.

[0048] It can be understood that precisely controlling the tolerance between the cutting length and the designed width of the annular part is based on the requirement for the overall accuracy of the bearing cage. When the bearing cage is installed in the bearing, its axial dimension accuracy affects the fitting accuracy of the entire bearing assembly. If the cutting length tolerance is too large, it will cause the cage to not fit tightly with other bearing components, resulting in problems such as shaking and increased friction during the operation of the bearing, reducing the service life and performance of the bearing. Controlling the tolerance within ±0.05 mm can effectively ensure the axial dimension accuracy of the cage, improve the assembly quality and overall performance of the bearing, reduce the scrap rate caused by dimensional deviation, and improve production efficiency.

[0049] Preferably, after cutting, chemical polishing can be used to remove the burrs on the cutting surface to improve the processing accuracy.

[0050] Step S3: Use laser cutting to cut a plurality of ball pockets on the annular part and leave a finishing allowance.

[0051] In this step, laser cutting of the ball pockets utilizes the high energy density of the laser beam to instantaneously melt or vaporize the material to be cut, achieving high-precision cutting. The allowance for finish machining is considered due to the possible minor errors in laser cutting and the subsequent need to further improve the accuracy of the ball pockets. In specific implementation, an indexing control method can be adopted to link the motion control of the CNC rotary table and the fiber laser cutting machine, enabling multiple ball pockets to be evenly distributed and formed on the circumferential side of the ring-shaped part.

[0052] Preferably, in this step, when using laser cutting to cut multiple ball pockets on the ring-shaped part, it is necessary to ensure that the aperture consistency error of multiple pockets is controlled within 0.02 mm. This requires precise setting and strict control of the parameters of the laser cutting equipment to ensure the same cutting conditions each time, thereby achieving a high degree of consistency in the apertures of multiple pockets. Before cutting, a comprehensive debugging and calibration of the laser cutting equipment should be carried out, including the calibration of key parameters such as laser power, pulse frequency, and cutting speed. During the processing, the apertures of the cut ball pockets can be randomly inspected regularly. If it is found that the aperture consistency error shows an increasing trend, the cause should be found in time and adjusted.

[0053] The ability to form multiple ball pockets with very good dimensional consistency is of great significance for improving the performance of the bearing. When the bearing is in operation, the pockets with consistent dimensions can evenly distribute the balls, making the force more balanced, reducing local wear and abnormal friction between the balls and the pockets, thereby improving the rotational accuracy, smoothness, and service life of the bearing, and enhancing the overall quality and performance of the bearing cage.

[0054] Step S4: Perform compound finish machining on the ring-shaped part to obtain the finished bearing cage.

[0055] In this step, compound finish machining can eliminate the errors accumulated during the previous machining process through fine machining of each part of the semi-finished product, improving the overall accuracy.

[0056] The forming method provided in this embodiment integrates the advantages of multiple processing technologies, avoids the problems of material waste, complex processes, and insufficient precision in traditional processes, and realizes the improvement of material utilization rate, the simplification of processes, and the improvement of precision. Specifically, taking the pipe as the starting raw material, the cold drawing process is used to initially form it, making the pipe close to the general contour of the bearing cage in terms of size and shape, while reserving machining allowances for subsequent more precise machining. Then, the drawn pipe is cut into annular parts according to the designed width to ensure that the width of the parts meets the requirements of the bearing cage. Next, a laser cutting technology is used to precisely cut a plurality of ball pockets on the annular parts. Due to the high precision of laser cutting, the position and size precision of the pockets can be guaranteed, and the finishing allowance is also reserved. Finally, through compound finishing, each part of the annular part is finely machined to make it meet the various precision and quality standards of the finished bearing cage. The compound finishing eliminates the errors accumulated in the previous processing through the fine machining of each part and improves the overall precision. This forming method integrates the advantages of multiple processing technologies, avoids the problems of material waste, complex processes, and insufficient precision in traditional processes, and realizes the improvement of material utilization rate, the simplification of processes, and the improvement of precision.

[0057] Please refer to Figure 4 , Figure 4 which shows the advantages of the bearing cage forming method provided by the present invention compared with the traditional process. Specifically, in terms of material utilization rate, the forming method provided by the present invention has a significant improvement compared with the traditional process. The material utilization rate of the traditional sheet metal stamping process is less than 11%, while the present invention reduces the generation of surplus materials and stamping waste by adopting the pipe drawing forming and laser cutting technologies, resulting in a 30%-40% increase in material utilization rate. For example, in actual production, taking the wind power bearing seat bracket as an example, the material utilization rate of the present invention can reach 32.5%, compared with 10.1% of the traditional process, with a significant increase of 221.7%. There is also an obvious improvement in terms of precision. The pipe drawing process can ensure uniform wall thickness, and the error can be controlled within ≤0.02 mm. The subsequent compound finishing process further eliminates the cumulative errors generated during the processing. In terms of dimensional stability, the present invention can control the dimensional deviation within ±0.03 mm, while the traditional process is ±0.15 mm, with an increase of 400%, effectively ensuring the dimensional precision of the bearing cage and improving the overall performance of the bearing. In terms of processes, the forming method provided by the present invention integrates multiple complex processes such as traditional stamping and drilling into three steps: drawing-cutting-finishing, greatly simplifying the production process. This not only reduces the equipment investment and production cycle but also improves the production efficiency, with a 30% increase in efficiency compared with the traditional process. For example, when processing a bearing cage, the processing time of the present invention is only 6 min / piece, while the traditional process requires 12 min / piece.

[0058] Based on the previous embodiment, a second embodiment of the forming method of the bearing cage is proposed. Specifically, please refer to Figure 3 , based on the first embodiment of the forming method of the bearing cage, the step S4 includes:

[0059] Step S41: Taking one end face of the ring-shaped part as a reference, turning the other end face to the designed thickness, and precisely turning the inner hole to the target size.

[0060] In this step, taking one end face of the ring-shaped part as a reference, the other end face is processed to the designed thickness through turning, and at the same time, the inner hole of the ring-shaped part is precisely turned to reach the target size. Turning is to cut the workpiece with a lathe tool. By precisely controlling the movement trajectory and cutting parameters of the tool, precise control of the end face thickness, inner hole size, and outer diameter size can be achieved. Preferably, a numerical control lathe can be used for cutting. After precise turning, the inner hole size should be basically equal to the designed size. Preferably, the inner hole size after processing can reach a difference of ±0.03 mm from the target size.

[0061] Step S42: Taking the processed end face and inner hole as references, turning the outer diameter to the target size.

[0062] In this step, first switch the processing reference, and then use a high-precision external grinding machine to turn the outer diameter. The tolerance between the target outer diameter and the designed outer diameter is preferably controlled within ±0.03 mm.

[0063] Step S43: Precision-repair the pocket holes to the target size and make the roughness of the ball contact surface meet the design requirements.

[0064] In this step, a numerical control milling machine or electrochemical machining can be used to precision-repair the pocket holes to the final size. Preferably, the tolerance from the designed value is controlled within ±0.01 mm. The roughness Ra of the ball contact surface is preferably less than or equal to 0.8 μm.

[0065] Electrochemical machining utilizes the principle of electrochemical reaction. By applying a certain voltage between the workpiece and the tool electrode, the metal on the surface of the workpiece undergoes anodic dissolution in the electrolyte, thereby realizing the processing of the workpiece. In one embodiment, electrochemical machining can be used to precisely process the pocket holes to reach the target size, and at the same time improve the roughness of the ball contact surface. This processing method has the advantages of high processing accuracy and good surface quality. It can precisely process the pocket holes without generating mechanical cutting force, avoiding deformation and surface damage caused by mechanical machining. By precisely controlling the processing parameters, the pocket hole size can reach a very high accuracy, and at the same time, the roughness of the ball contact surface meets the design requirements, improving the quality and performance of the bearing cage, reducing the friction and wear between the balls and the pocket holes, and extending the service life of the bearing.

[0066] In another alternative embodiment, the steps of precisely machining the pocket holes using a CNC milling machine may specifically include: rough milling the pocket holes using a CNC milling machine with the cutting amount controlled to be less than or equal to 0.25 mm; and finish milling the pocket holes using a CNC milling machine with the cutting amount controlled to be less than or equal to 0.05 mm. In this embodiment, a combination of rough milling and finish milling is adopted. First, rough milling is performed to remove most of the surplus, which can improve the processing efficiency. Then, finish milling is carried out to further precisely control the size and surface quality of the pocket holes. A smaller cutting amount during finish milling can precisely control the size and surface quality. Through the cooperation of rough milling and finish milling, both the processing efficiency and the processing accuracy are ensured. Reasonably controlling the cutting amount can avoid the decline in processing accuracy and the deterioration of surface quality caused by excessive cutting amount, and can also avoid the low processing efficiency caused by too small cutting amount. This processing method can effectively improve the processing quality of the pocket holes, enabling the bearing cage to better meet the usage requirements and enhancing the performance and service life of the bearing.

[0067] In this embodiment, in the compound finish machining stage, first, one end face of the annular part is used as a reference, and the other end face is machined to the designed thickness through turning, while the inner hole of the annular part is finish turned to reach the target size. Then, using the already machined end face and inner hole as new references, the outer circle of the annular part is turned to ensure that the outer circle size meets the requirements. Finally, the ball pocket holes are precisely machined. Not only should the pocket holes reach the target size, but also the roughness of the ball contact surface should meet the design standard. In the first stage of the compound finish machining, machining with one end face as a reference can ensure the relative position accuracy between the machining surfaces. Precisely machining the pocket holes is to further improve the accuracy of the pocket holes and the quality of the ball contact surface, ensure the fitting accuracy between the balls and the pocket holes during the operation of the bearing, reduce friction and wear, and improve the service life and performance of the bearing. Through this series of finish machining steps, the errors accumulated during the previous machining process can be effectively eliminated, and the overall accuracy and quality of the bearing cage can be improved.

[0068] Preferably, step S43 includes: machining using a CNC milling machine, precisely machining the pocket holes to the target size, and ensuring that the roughness of the ball contact surface meets the design requirements. During the machining process, through the A / C axis linkage, ensure that the perpendicularity between the axis of the pocket hole and the end face is less than 3 μm / mm. The CNC milling machine realizes the precise movement of the tool through digital control technology and can perform high-precision machining on the pocket holes according to the preset program. The A / C axis linkage method can precisely control the posture of the tool and ensure the perpendicularity between the axis of the pocket hole and the end face, which is crucial for the performance of the bearing cage. If the perpendicularity between the axis of the pocket hole and the end face does not meet the standard, it will cause uneven force on the balls during operation, increase friction and wear, and reduce the service life of the bearing. By using a CNC milling machine for machining and controlling the A / C axis linkage, the machining accuracy and surface quality of the pocket holes can be effectively improved, and the overall performance of the bearing cage can be enhanced.

[0069] In specific implementation, a numerically controlled milling machine is used to finely machine the pocket holes. The movement trajectory of the milling cutter of the milling machine is controlled by a pre-written numerical control program to achieve precise machining of the size and shape of the pocket holes. During the machining process, the perpendicularity between the axis of the pocket hole and the end face is ensured through the linkage of the A / C axes. The A / C axes respectively control the rotation and movement of the cutter in different directions, thereby precisely adjusting the attitude of the cutter to ensure the machining accuracy.

[0070] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A forming method of a bearing cage, characterized in that, Including: Providing a pipe blank, subjecting the pipe blank to cold drawing and forming, and reserving a machining allowance; Cutting the drawn and formed pipe into annular parts, and controlling the cutting length of the annular parts to be the designed width of the bearing cage; Cutting a plurality of ball pockets on the annular parts by laser cutting, and reserving a finishing allowance; Performing composite finishing on the annular parts to obtain the finished bearing cage.

2. The forming method of the bearing cage according to claim 1, characterized in that, The step of providing a pipe blank, subjecting the pipe blank to cold drawing and forming, and reserving a machining allowance includes: Providing a pipe blank, and subjecting the pipe blank to multi-mode continuous drawing and forming.

3. The forming method of the bearing cage according to claim 2, characterized in that, In the step of providing a pipe blank and subjecting the pipe blank to multi-mode continuous drawing and forming, the reduction per pass of subjecting the pipe blank to multi-mode continuous drawing and forming is controlled to be greater than or equal to 8% and less than or equal to 12%.

4. The forming method of the bearing cage according to claim 1, characterized in that, The step of performing composite finishing on the annular parts to obtain the finished bearing cage includes: Taking one end face of the annular part as a reference, turning the other end face to the designed thickness, and precision-turning the inner hole to the target size; Taking the processed end face and inner hole as references, turning the outer diameter to the target size; Precision-finishing the pockets to the target size, and ensuring that the surface roughness of the ball contact surface meets the design requirements.

5. The forming method of the bearing cage according to claim 4, characterized in that, The step of precision-finishing the pockets to the target size and ensuring that the surface roughness of the ball contact surface meets the design requirements includes: Adopting electrochemical machining to precision-finish the pockets to the target size, and ensuring that the surface roughness of the ball contact surface meets the design requirements.

6. The forming method of the bearing cage according to claim 4, characterized in that, The step of precision-finishing the pockets to the target size and ensuring that the surface roughness of the ball contact surface meets the design requirements includes: Adopting a CNC milling machine for machining, precision-finishing the pockets to the target size, and ensuring that the surface roughness of the ball contact surface meets the design requirements. During the machining process, through the A / C axis linkage, ensuring that the perpendicularity between the pocket axis and the end face is less than 3μm / mm.

7. The forming method of the bearing cage according to claim 4, characterized in that, The step of precision-finishing the pockets to the target size and ensuring that the surface roughness of the ball contact surface meets the design requirements includes: Rough milling the pockets using a CNC milling machine, and controlling the cutting amount to be less than or equal to 0.25mm; Finely milling the pockets using a CNC milling machine, and controlling the cutting amount to be less than or equal to 0.05mm.

8. The forming method of the bearing cage according to any one of claims 1 to 7, characterized in that In the step of providing a pipe blank, subjecting the pipe blank to cold drawing and forming, and reserving a machining allowance, the wall thickness of the drawn and formed pipe is D1, and the designed wall thickness of the bearing cage is D2. D1 - D2 is greater than or equal to 0.8mm and less than or equal to 1.2mm.

9. The forming method of the bearing cage according to any one of claims 1 to 7, characterized in that In the step of cutting the drawn and formed pipe into annular parts and controlling the cutting length of the annular parts to be the designed width of the bearing cage, the tolerance between the cutting length of the annular parts and the designed width of the bearing cage is controlled within ±0.05mm.

10. The forming method of the bearing cage according to any one of claims 1 to 7, characterized in that, In the step of cutting a plurality of ball pockets on the annular parts by laser cutting and reserving a finishing allowance, the aperture consistency error of the plurality of ball pockets is less than or equal to 0.02mm.

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