A method for machining a self-aligning ball bearing cage

Abstract

A method for machining a self-aligning ball bearing cage is disclosed, relating to the field of self-aligning bearing machining. Existing self-aligning bearing cages use ordinary drilling machines to machine the pockets, resulting in poor consistency and stability in the machining dimensions and accuracy of the pockets, and a low yield rate. The improved process of this invention involves using a CNC twin-spindle machine for the first machining step. The machining method involves the main spindle of the CNC twin-spindle machine clamping the outer diameter of the annular material and performing the first machining step, namely, fine turning of the first plane, drilling, fine turning of the inner diameter, fine turning of the outer diameter, and turning of the inner and outer chamfers. Then, the auxiliary spindle clamps the outer diameter of the cage and performs cutting, fine turning of the cut surface (which is the second plane), and turning of the inner and outer chamfers. The second step is machining the pockets. Only two main machining steps are needed to complete the entire machining process of the cage. This machining method shortens the machining cycle and improves machining efficiency. This invention is applied in the field of bearing machining.

Description

Technical Field

[0001] This invention relates to the field of self-aligning bearing processing, and more specifically to a method for processing a self-aligning ball bearing cage. Background Technology

[0002] Self-aligning ball bearings are bearings that can accommodate angular misalignment between the shaft and the bearing housing, automatically adjusting their center to ensure normal operation. The main functions of self-aligning ball bearings include: automatic self-alignment, bearing large radial loads, and reducing friction. They automatically adjust to compensate for angular misalignment or shaft deflection, allowing them to function normally even under installation errors or shaft bending. These bearings are typically suitable for applications where the shaft and housing may deflect, and for bearing heavy and impact loads. The machining of the cage pockets in self-aligning bearings is a critical step. The machining accuracy and quality of the pockets directly affect the bearing's performance and service life. During pocket machining, strict control of dimensional accuracy, shape accuracy, and surface roughness is required to ensure that the pockets accurately accommodate the rolling elements and provide them with a good motion trajectory. Simultaneously, attention must be paid to the rationality and stability of the machining process to ensure that the machined cage pockets meet relevant standards and requirements.

[0003] Currently, the pockets of self-aligning bearing cages are machined using ordinary drilling machines. The machining process is complex, resulting in more clamping operations and deformation of the workpiece. This leads to a low pass rate and poor consistency and stability of the hole's dimensions and precision, affecting bearing performance. The cage cannot effectively guide the rolling elements, causing unstable bearing operation, reduced precision and lifespan. Poor fit between the rolling elements and the cage can lead to excessive wear, potentially causing abnormal phenomena such as noise and vibration, increasing the likelihood of bearing failure. Summary of the Invention

[0004] The present invention aims to solve the problem that the existing self-aligning bearing cages are machined using ordinary drilling machines, resulting in poor consistency and stability of the machined dimensions and accuracy of the pockets, as well as a low machined pass rate. Therefore, the present invention provides a machining method for self-aligning ball bearing cages. This machining method improves the dimensional accuracy of the pockets and enhances the machining quality and pass rate of the products.

[0005] The technical solution of this invention is:

[0006] A method for machining a self-aligning ball bearing cage, wherein pockets are machined on both sides of the bearing cage, the method comprising the following steps:

[0007] Step 1: Machining the bar stock:

[0008] The bar stock is finely machined with a first plane on any one side. A hole is drilled at the center of the first plane. After drilling, the inner diameter and outer diameter are finely machined. The inner and outer chamfers are machined. The bar is then cut off and the cut surface is finely machined. The cut surface is a second plane. The inner and outer chamfers are machined to obtain a ring-shaped aluminum alloy material after machining.

[0009] Step 2: Grinding the outer diameter:

[0010] The aluminum alloy ring material after cutting in step one is processed by a centerless cylindrical grinding machine to process the outer diameter of the aluminum alloy ring material, thus obtaining the aluminum alloy ring material with the outer diameter processed.

[0011] Step 3: Inner diameter of the vehicle:

[0012] The inner diameter of the aluminum alloy material processed in step two is machined using a conventional lathe to obtain an aluminum alloy ring-shaped material with machined inner diameter.

[0013] Step 4: Drill a hole:

[0014] The aluminum alloy cage is obtained by drilling a hole using a drilling mold and drilling two planes of the aluminum alloy material with a carbide drill bit.

[0015] Step 5: Deburring:

[0016] Deburring involves removing burrs or flash formed at the intersection of surfaces of a part using a manual scraper. After deburring, a burr-free aluminum alloy cage is obtained.

[0017] Step Six: Polishing

[0018] The aluminum alloy cage is finished using a finishing machine for 1.2h to 2.5h to obtain a bright aluminum alloy cage.

[0019] Step 7: Fluorescent penetration;

[0020] Fluorescent penetrant testing was used to inspect surface defects in materials.

[0021] Step 8: Pickling

[0022] The aluminum alloy cage surface is pickled by immersing it in an acidic solution to clean the cage surface.

[0023] Step Nine: Final Inspection

[0024] Inspect the cage for appearance, dimensional accuracy, pocket shape and position, and cleanliness to ensure that the cage dimensions are within acceptable limits.

[0025] Preferably, in the processing method of the self-aligning ball bearing cage, after step nine is completed, the qualified aluminum alloy cage is subjected to surface anodizing treatment. The aluminum alloy cage is placed in an electrolyte solution and a dense and uniform oxide layer is generated on its surface by anodic electrolysis under the action of direct current.

[0026] Preferably, the bar cutting process in step one is performed by a CNC dual-spindle machine. The main spindle of the CNC dual-spindle machine clamps the outer diameter of the bar and performs the above-mentioned processing, namely, fine turning of the first plane, drilling, fine turning of the inner diameter, fine turning of the outer diameter, and turning of the inner and outer chamfers. The secondary spindle clamps the outer diameter of the cage and performs cutting, fine turning of the second plane, and turning of the inner and outer chamfers.

[0027] Preferably, the drilling mold in step four includes a workpiece seat, a cover plate, a cylindrical locating pin, and a hexagonal bolt. The retainer is disposed between the cover plate and the workpiece seat, and the workpiece seat and the cover plate are connected by hexagonal bolts. The cylindrical locating pin is inserted into the hole on the cover plate and the workpiece seat.

[0028] Preferably, the workpiece seat has a stepped positioning pin hole, and a stepped positioning pin is inserted into the positioning pin hole. The two are tightly fitted and used to process the pocket of the second plane. The stepped positioning pin is positioned with one of the pockets that has been processed on the first plane to ensure the positional relationship between the pockets on the first plane and the second plane.

[0029] Preferably, the method for drilling the hole in step four includes:

[0030] First, fit the inner diameter of the cage onto the workpiece seat, that is, position the inner diameter of the cage with the plane. Then press on the cover plate, and use cylindrical locating pins to connect the cover plate and the workpiece seat to fix the position of the cover plate and the workpiece seat. Finally, tighten the hexagonal bolts to fix the cage in position, and drill holes on the CNC machining center.

[0031] Preferably, the cage has a set of drilled pockets with six equally spaced pockets on each of the first and second planes.

[0032] Preferably, the pockets on the two sides of the retainer are processed in a staggered manner, with the pockets on the first plane being processed first, and the retainer being flipped over to process the pockets on the second plane.

[0033] Preferably, the electrolyte solution used for the surface anodizing treatment is a sulfuric acid anolyte or an oxalic acid anolyte;

[0034] The sulfuric acid anolyte is a sulfuric acid solution with a concentration of 180-250 g / L, a temperature of 18-22℃, and an anodizing rate of 1.0-1.5 μm / min;

[0035] The oxalic acid anolyte has the following characteristics: oxalic acid 180-250 g / L, temperature 18-22℃, and anodizing rate of 0.5-1.0 μm / min.

[0036] Preferably, the surface anodizing treatment method is as follows:

[0037] Place the cleaned aluminum alloy retainer in the anode tank, ensuring full contact between the retainer and the anolyte. Adjust the power supply to set the current density to 0.3-0.5 A / cm². 2 The aluminum alloy cage is removed after anodizing, which takes 30-60 minutes. After cleaning and sealing, the aluminum alloy cage is removed and the anodized solution is thoroughly rinsed with clean water.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1. This invention replaces the use of ordinary drilling machines to process pockets. Traditionally, the processing mainly involves forming, cutting, turning two planes, rough grinding of the outer diameter, rough turning of the inner diameter, final grinding of the outer diameter, final turning of the inner diameter, chamfering, drilling pockets, deburring, finishing, fluorescent penetrating, pickling, final inspection, and packaging. This process is complex and has drawbacks. By using a processing method for self-aligning ball bearing cages, the dimensional accuracy of the pockets is improved, the processing quality and pass rate of the product are enhanced, thereby improving the processing level of self-aligning ball bearing cages and the stability and consistency of the processing process, thus extending the service life of the bearing.

[0040] 2. Compared with the original cage machining steps, this invention saves the steps of "turning both planes, rough grinding the outer diameter, and rough turning the inner diameter." The original method required nine main machining steps to complete the cage machining, while the improved method only requires four main machining steps to complete the entire cage machining process. This saves material preparation time, workpiece loading and unloading time, workpiece clamping time, and product movement time on the machining site. The improved method only requires two clamping operations to complete multiple machining processes. It also improves the product's machining accuracy.

[0041] 3. The improved process route of this invention involves using a CNC twin-spindle machine to process the bar stock in the first stage. The machining method involves the main spindle of the CNC twin-spindle machine clamping the outer diameter of the bar stock for the first stage of machining, namely, fine turning of the first plane, drilling, fine turning of the inner diameter, fine turning of the outer diameter, and turning of the inner and outer chamfers. Then, the auxiliary spindle clamps the outer diameter of the cage for cutting, fine turning of the cut surface (second plane), and turning of the inner and outer chamfers. The next step, step four, is machining the pocket. Only steps one through four of this invention are needed to complete the entire machining process of the cage. This machining method shortens the machining cycle and improves machining efficiency.

[0042] 4. This invention adds a surface anodizing process to the process flow. Surface anodizing involves placing the metal or alloy material in an electrolyte and performing anodic electrolysis under the action of direct current to generate a dense and uniform oxide layer on its surface. This oxide layer has high hardness, wear resistance, and corrosion resistance. During the surface anodizing process, the cations in the electrolyte form an oxide film, thereby improving the surface properties of the material and extending its service life. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the process flow of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the drilling mold of the present invention;

[0045] Figure 3 This is a schematic diagram of the stepped positioning pin of the present invention;

[0046] Figure 4 This is a schematic diagram of the cage structure of the present invention;

[0047] Figure 5 yes Figure 4 AA section view;

[0048] In the diagram: 1. Workpiece seat, 2. Cover plate, 3. Cylindrical locating pin, 4. Hex bolt, 5. Locating pin hole, 6. Stepped locating pin, 7. Pocket, 8. Cage. Detailed Implementation

[0049] Specific implementation method one: Combining Figure 1 This embodiment describes a method for machining a self-aligning ball bearing cage, which includes the following steps:

[0050] Bar stock processing:

[0051] The process involves fine turning of the first plane, drilling, fine turning of the inner and outer diameters, turning the inner and outer chamfers, cutting off, and fine turning of the cut surface (which is the second plane). The CNC dual-spindle machine clamps the outer diameter of the bar stock and performs the above-mentioned machining: fine turning of the first plane, drilling, fine turning of the inner and outer diameters, and turning the inner and outer chamfers. The auxiliary spindle clamps the outer diameter of the cage and performs cutting, fine turning of the second plane, and turning the inner and outer chamfers. This yields an aluminum alloy cage with an outer diameter of 14.4mm–14.5mm, an outer diameter ellipticity of 0.02mm, and an outer diameter taper of 0.01mm; an inner diameter of 10.4mm–10.5mm, an ellipticity of 0.02mm, a taper of 0.01mm, a wall thickness difference of 0.013mm, and a perpendicularity difference of 0.01mm; and a width of 5.4mm–5.5mm, a flatness of 0.01mm, and a parallelism difference of 0.012mm.

[0052] Grinding outer diameter:

[0053] An aluminum alloy cage with an outer diameter of 14.3 mm to 14.4 mm, an outer diameter ellipticity of 0.003 mm, an outer diameter taper of 0.002 mm, and an outer diameter facetness of 0.004 mm was obtained by using a centerless cylindrical grinding machine.

[0054] Car interior diameter

[0055] The inner diameter is machined using a conventional lathe to obtain an aluminum alloy cage with an inner diameter of 10.6mm to 10.7mm, an ovality of 0.01mm, a taper of 0.007mm, a wall thickness difference of 0.01mm, and a vertical difference of 0.008mm.

[0056] Drill a hole:

[0057] The hole is drilled using a hole-drilling mold, and a carbide drill bit is used to drill the two planes of the cage to obtain an aluminum alloy cage with a hole size of 3.3mm to 3.35mm.

[0058] The drilling of the pocket holes utilizes a carbide variable-diameter drill bit to improve its rigidity, making it less prone to breakage during use and extending tool life. Machining parameters: n = 1500-200 r / min, f = 0.03-0.06 mm / min. Before drilling the pocket holes, the following precautions should be taken: adjust the plane position of workpiece seat 1 to ensure the plane is not tilted, and use a magnetic meter to measure the plane to achieve a deviation of 0.01-0.02 mm, thereby ensuring the positional accuracy of the pocket holes on both sides.

[0059] Deburring:

[0060] Deburring involves removing burrs or flash formed at the intersection of surfaces of a part using a manual scraper. After deburring, a burr-free cage is obtained.

[0061] Lighting:

[0062] The holder is polished using a polishing machine for 1.2 to 2.5 hours. The holder is correctly installed on the fixture of the polishing machine. Appropriate abrasive and liquid are added to the polishing machine, and the polishing process is started. The holder rotates, rubs, and impacts under the action of the abrasive and the machine. During the polishing process, the polishing effect of the holder is checked periodically. After the predetermined time is reached, the polishing is stopped, the holder is removed, and a bronze holder with a bright surface is obtained.

[0063] Fluorescent penetration

[0064] Inspecting material surface defects using fluorescent penetrant testing;

[0065] Pickling:

[0066] The cage surface is pickled by immersing it in an acidic solution. The acidic solution reacts chemically with the oxides and dirt on the metal surface, thereby cleaning the cage surface.

[0067] Final inspection:

[0068] The cage undergoes visual inspection, dimensional accuracy inspection, pocket shape and position inspection, and cleanliness inspection to ensure that the cage surface is clean and free of impurities. The cage dimensions are checked to ensure that they are within acceptable limits.

[0069] Surface anodizing treatment:

[0070] Metal or alloy materials are placed in an electrolyte solution and electrolyzed anolytically, and a dense, uniform oxide layer is generated on their surface under the action of direct current.

[0071] Table 1

[0072]

[0073] The data in Table 1 shows that the outer diameter variation of the cage is controlled within 0.01 mm, the outer diameter ellipticity within 0.003 mm, the inner diameter variation within 0.02 mm, the inner diameter ellipticity within 0.012 mm, the pocket size variation within 0.01 mm, the pocket mutual difference within 0.02 mm, and the pocket equal division difference within 0.05 mm. The product processing qualification rate reaches 97%-99%. This processing method significantly improves the processing accuracy and qualification rate of the cage, laying the foundation for future fine processing of the cage and providing an important technical means.

[0074] The improved process route uses a CNC twin-spindle machine to process the first bar stock. The process involves the spindle of the CNC twin-spindle machine clamping the outer diameter of the bar stock and performing the first processing step, namely, fine turning of the first plane, drilling, fine turning of the inner diameter, fine turning of the outer diameter, and turning of the inner and outer chamfers. Then, the secondary spindle clamps the outer diameter of the cage and performs cutting, fine turning of the cut surface second plane, and turning of the inner and outer chamfers. The next process is to process the pocket hole. Only two main processing steps are needed to complete the entire processing flow of the cage.

[0075] Specific Implementation Method Two: Combining Figure 2 and Figure 3 This embodiment describes a method for processing a self-aligning ball bearing cage. The drilling mold includes four parts: a workpiece seat 1, a cover plate 2, a cylindrical locating pin 3, and a hexagonal bolt 4. The cage 8 is disposed between the cover plate 2 and the workpiece seat 1. The workpiece seat 1 and the cover plate 2 are connected by the hexagonal bolt 4. The cylindrical locating pin 3 is inserted into the holes on the cover plate 2 and the workpiece seat 1.

[0076] When using the drilling mold, the inner diameter of the retainer 8 is placed on the workpiece seat 1, that is, the inner diameter of the retainer 8 is positioned with the plane. Then, the cover plate 2 is pressed on, and the cylindrical positioning pin 3 is used to connect the cover plate 2 and the workpiece seat 1 to fix the position of the cover plate 2 and the workpiece seat 1. Finally, the hexagonal bolt 4 is tightened to fix the position of the retainer 8. At this time, the drilling of the hole 7 on the CNC machining center can begin.

[0077] The cage 8 is characterized by having six equally spaced pockets 7 on both the first and second planes, with the pockets 7 on both sides being machined in a staggered manner. The pockets 7 on the first plane are machined first, and then the pockets 7 on the second plane are machined on the other side. At this time, a stepped locating pin 6 is inserted into the stepped locating pin hole 5 designed in the workpiece holder 1, and the two are tightly fitted. The stepped locating pin 6 is used to position the cage by one of the already machined pockets 7 on the first plane, thereby ensuring the positional relationship of the pockets 7 on the first and second planes.

[0078] Specific implementation method three: Combining Figure 4 and Figure 5 This embodiment describes a method for machining a self-aligning ball bearing cage. The workpiece seat 1 has a stepped positioning pin hole 5, and a stepped positioning pin 6 is inserted into the positioning pin hole 5. The two are tightly fitted and used to machine the pocket of the second plane. The stepped positioning pin 6 is positioned with one of the pockets 7 that has been machined on the first plane, ensuring the positional relationship of the pockets 7 on the first plane and the second plane.

[0079] The method for drilling holes includes:

[0080] First, fit the inner diameter of the retainer 8 onto the workpiece seat 1, that is, position the inner diameter of the retainer 8 with the plane. Then press on the cover plate 2, and use the cylindrical positioning pin 3 to connect the cover plate 2 and the workpiece seat 1 to fix the position of the cover plate 2 and the workpiece seat 1. Finally, tighten the hexagonal bolt 4 to fix the retainer 8 in position, and drill the pocket hole 7 on the CNC machining center.

[0081] The retainer 8 has a set of six equally spaced pockets 7 on each of the first and second planes. The pockets 7 on the two sides of the retainer 8 are machined in a staggered manner. The pockets 7 on the first plane are machined first, and then the retainer 8 is flipped over to machine the pockets 7 on the second plane.

[0082] Specific implementation method four: Combination Figure 4 and Figure 5 This embodiment describes a method for processing a self-aligning ball bearing cage, characterized in that the anolyte used in the surface anodizing treatment is a sulfuric acid anolyte or an oxalic acid anolyte.

[0083] The sulfuric acid anolyte is a sulfuric acid solution with a concentration of 180-250 g / L, a temperature of 18-22℃, and an anodizing rate of 1.0-1.5 μm / min;

[0084] The oxalic acid anolyte has the following characteristics: oxalic acid 180-250 g / L, temperature 18-22℃, and anodizing rate of 0.5-1.0 μm / min.

[0085] Specific Implementation Method Five: Combining Figure 4 and Figure 5 This embodiment describes a method for processing a self-aligning ball bearing cage, including a surface anodizing treatment method:

[0086] Place the cleaned aluminum alloy retainer in the anode tank, ensuring full contact between the retainer and the anolyte. Adjust the power supply to set the current density to 0.3-0.5 A / cm². 2 The aluminum alloy cage is removed after anodizing, which takes 30-60 minutes. After cleaning and sealing, the aluminum alloy cage is removed and the anodized solution is thoroughly rinsed with clean water.

[0087] The main function of the surface anodizing treatment method is:

[0088] (1) Improve the surface hardness and wear resistance of the cage material:

[0089] Surface anodizing can form a hard ceramic film on the metal surface. The hardness of this film can be several times or even tens of times that of the metal, thereby greatly improving the surface hardness and wear resistance of the cage material.

[0090] (2) Improve the corrosion resistance of the cage material surface:

[0091] Surface anodizing can form a dense oxide film on the metal surface, which can not only prevent corrosive media from entering the metal, but also form an insoluble oxide film on the surface, thereby greatly improving the surface corrosion resistance of the cage material.

[0092] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to well understand and utilize the invention. The invention is limited only to the claims and their full scope and equivalents.

Claims

1. A method for machining a self-aligning ball bearing cage, characterized in that, The bearing cage is machined with pockets on both sides. This method includes the following steps: Step 1: Machining the bar stock: The bar stock is finely machined with a first plane on any one side. A hole is drilled at the center of the first plane. After drilling, the inner diameter and outer diameter are finely machined. The inner and outer chamfers are machined. The bar is then cut off and the cut surface is finely machined. The cut surface is a second plane. The inner and outer chamfers are machined to obtain a ring-shaped aluminum alloy material after machining. Step 2: Grinding the outer diameter: The aluminum alloy ring-shaped material after cutting in step one is processed by a centerless cylindrical grinding machine to process the outer diameter of the aluminum alloy ring-shaped material bar, thus obtaining the aluminum alloy ring-shaped material with the outer diameter processed. Step 3: Inner diameter of the vehicle: The inner diameter of the aluminum alloy material processed in step two is machined using a conventional lathe to obtain an aluminum alloy ring-shaped material with machined inner diameter. Step 4: Drill a hole: The aluminum alloy cage is obtained by drilling a hole using a drilling mold and drilling two planes of the aluminum alloy material with a carbide drill bit. Step 5: Deburring: Deburring involves removing burrs formed at the intersection of surfaces of a part using a manual scraper. After deburring, a burr-free aluminum alloy cage is obtained. Step Six: Polishing The aluminum alloy cage is finished using a finishing machine for 1.2h to 2.5h to obtain a bright aluminum alloy cage. Step 7: Fluorescent Infiltration Fluorescent penetrant testing was used to inspect surface defects in materials. Step 8: Pickling The aluminum alloy cage surface is pickled by immersing it in an acidic solution to clean the cage surface. Step Nine: Final Inspection Inspect the cage for appearance, dimensional accuracy, pocket shape and position, and cleanliness to ensure that the cage dimensions are within acceptable limits. After step nine is completed, the qualified aluminum alloy cage will undergo surface anodizing treatment. The aluminum alloy cage will be placed in an electrolyte solution and anodized under the action of direct current to generate a dense and uniform oxide layer on its surface. The electrolyte solution used for the surface anodizing treatment is either sulfuric acid anodizing solution or oxalic acid anodizing solution; The sulfuric acid anolyte is a sulfuric acid solution with a concentration of 180-250 g / L, a temperature of 18-22℃, and an anodizing rate of 1.0-1.5 μm / min; The oxalic acid anolyte has the following characteristics: oxalic acid 180-250 g / L, temperature 18-22℃, and anodizing rate of 0.5-1.0 μm / min. The surface anodizing treatment method described above: Place the cleaned aluminum alloy retainer in the anode tank, ensuring full contact between the retainer and the anolyte. Adjust the power supply and set the current density to 0.3-0.5 A / cm². Perform anodizing treatment using the power supply for 30-60 minutes. Clean and seal the tank after the anodizing process is complete. Remove the aluminum alloy retainer and rinse it thoroughly with clean water to remove the anolyte. The annular material cutting process in step one is performed by a CNC dual-spindle machine. The main spindle of the CNC dual-spindle machine clamps the outer diameter of the annular material and performs the above-mentioned processing, namely, fine turning of the first plane, drilling, fine turning of the inner diameter, fine turning of the outer diameter, and turning of the inner and outer chamfers. The secondary spindle clamps the outer diameter of the cage and performs cutting, fine turning of the second plane, and turning of the inner and outer chamfers. The cage has six equally spaced pockets on its first and second planes, and the pockets on the two sides are machined in a staggered manner.

2. The method for processing a self-aligning ball bearing cage according to claim 1, characterized in that: The drilling mold in step four includes four parts: workpiece seat (1), cover plate (2), cylindrical positioning pin (3) and hexagonal bolt (4). The retainer (8) is set between the cover plate (2) and the workpiece seat (1). The workpiece seat (1) and the cover plate (2) are connected by hexagonal bolt (4). The cylindrical positioning pin (3) is inserted into the hole on the cover plate (2) and the workpiece seat (1).

3. The method for processing a self-aligning ball bearing cage according to claim 2, characterized in that: The workpiece seat (1) is provided with a stepped positioning pin hole (5), and a stepped positioning pin (6) is inserted into the positioning pin hole (5). The two are tightly fitted and used to process the pocket (7) of the second plane. The stepped positioning pin (6) is positioned with one of the pockets (7) that has been processed on the first plane to ensure the positional relationship between the pockets (7) on the first plane and the second plane.

4. The method for processing a self-aligning ball bearing cage according to claim 1, characterized in that, The method for drilling the hole in step four includes: First, fit the inner diameter of the retainer (8) onto the workpiece seat (1), that is, position the inner diameter of the retainer (8) against the plane. Then press the cover plate (2) on, and then use the cylindrical positioning pin (3) to connect the cover plate (2) and the workpiece seat (1) to fix the position of the cover plate (2) and the workpiece seat (1). Finally, tighten the hexagonal bolt (4) to fix the retainer (8) in position, and drill the pocket hole (7) on the CNC machining center.

5. A method for processing a self-aligning ball bearing cage according to claim 4, characterized in that, The two pockets (7) on the cage (8) are machined in a staggered manner. The pockets (7) on the first plane are machined first, and the cage (8) is flipped over to machine the pockets (7) on the second plane.

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