A double half-ring raceway grinding method of a high-precision four-point contact ball bearing

Abstract

The application relates to the technical field of bearing machining, in particular to a double-half-ring raceway grinding method for high-precision four-point contact ball bearings, which is characterized in that the method comprises the following steps: step one, step two, step three, step four, step five and step six, and a first grinding wheel and a diamond roller are specifically used; the method has the advantages that the first grinding wheel is first processed by using a specially-made diamond roller which is consistent with the shape and the curvature of the half inner ring and a small-end reference surface, then the raceways of the first half ring and the second half ring and the small-end reference surface are sequentially processed by using the first grinding wheel, and finally the first half ring and the second half ring are tightly combined, so that the traditional grinding method is optimized, the precision influencing factors in the product machining process are few, the service life of the diamond roller is long after one-time production, the diamond roller can continuously process hundreds of thousands of products, the groove center distance of the products is easy to control, the consistency is good, and the like.

Description

Technical Field

[0001] This invention relates to the field of bearing processing technology, specifically to a method for grinding the raceways of double half-rings of a high-precision four-point contact ball bearing. Background Technology

[0002] High-precision four-point contact ball bearings (such as...) Figure 9 This is an angular contact ball bearing with a separable inner or outer ring, capable of withstanding bidirectional axial loads. Its inner and outer ring raceways have a peach-shaped cross-section. When there is no load or a pure radial load, the steel ball 7 and the raceway are in four-point contact. The bearing contact angle is the contact angle formed by the steel ball 7 and the raceway, and is an important indicator of four-point contact ball bearings. The precision of this indicator's machining directly affects many performance indicators such as the bearing's smooth operation under working conditions, service life, and axial load capacity.

[0003] Because the inner ring of the bearing is in a split state (the inner ring consists of the first half ring 4 and the second half ring 5), the contact angle cannot be directly measured and controlled during grinding. It can only be indirectly controlled through the groove curvature and groove center distance.

[0004] Currently, the following methods are commonly used for raceway grinding when using double-half inner or outer rings: such as... Figure 8 As shown, place the shim 8 between the first half-circle 4 and the second half-circle 5 and tighten them together. The thickness of the shim is the same as the groove center distance. Use a diamond pen 10 to dress the second grinding wheel 9 so that the shape of the second grinding wheel 9 is consistent with the shape of the raceway. Then use the second grinding wheel 9 to process the product. After processing, remove the shim 8 and tighten the half-circle 4 and the second half-circle 5 together before use.

[0005] This grinding method has the following drawbacks:

[0006] (1) In the process of grinding the "heart groove" with shims 8 on the first half ring 4 and the second half ring 5, the thickness of different shims 8 has processing errors, which will directly affect the groove center distance after removing the shims 8, and thus affect the finished contact angle of the bearing.

[0007] (2) The first half-circle 4, the second half-circle 5 and the shim 8 need to be tightened together before processing. The final accuracy of the product (after removing the shim 8) is easily affected by the magnitude of the tightening force.

[0008] (3) The surface quality of the reference surface of the first half-circle 4 and the second half-circle 5 and the contact surface of the gasket 8 are subject to high requirements. If there are burrs, foreign objects or large defects, the quality of the processed product will be greatly affected.

[0009] (4) Each group of the first half circle 4 and the second half circle 5 needs to be fitted with a gasket 8 and tightened. After processing, the gasket 8 needs to be removed. The efficiency is too low and it is not suitable for mass production.

[0010] Therefore, it is necessary to invent a high-precision grinding method for the raceways of double half-rings of a four-point contact ball bearing. Summary of the Invention

[0011] To achieve the above objectives, the present invention provides the following technical solution: a method for grinding the raceways of a double-half-ring of a high-precision four-point contact ball bearing, comprising steps one, two, three, four, five, and six, specifically using a first grinding wheel and a diamond roller.

[0012] Step 1: After the first grinding wheel is installed and fixed, drive the diamond roller to one side and grind the first grinding wheel. After the first grinding wheel is finished, the diamond roller retracts and resets.

[0013] Step 2: Secure the double semicircles to the specially designed fixing device, and use the separation structure in the fixing device to separate the double semicircles;

[0014] Step 3: Place one half-circle directly below the first grinding wheel, drive the first grinding wheel downward to grind one half-circle, and at the same time drive the half-circle to rotate using a special fixing device to process the raceway and small end reference surface of one half-circle. After processing, the first grinding wheel is reset upward.

[0015] Step 4: Activate the specially designed fixing device to flip the unprocessed half-circle to directly under the first grinding wheel, while the processed half-circle flips out from under the first grinding wheel;

[0016] Step 5: Drive the first grinding wheel downwards again to grind the other half of the circle. At the same time, the special fixing device drives the other half of the circle to rotate, and machine the raceway and small end reference surface of the half of the circle. After the machining is completed, the first grinding wheel returns to the starting position.

[0017] Step 6: Remove the finished double half-circles from the fixing device and tighten them together before use.

[0018] Preferably, in step one, the first grinding wheel is rotatably connected to a grinding wheel bracket, and a first hydraulic rod is fixedly installed on the top surface of the grinding wheel bracket. The upper end of the first hydraulic rod is fixedly connected to a grinding support, which has a C-shaped structure, and the first hydraulic rod is located on the top of the grinding support.

[0019] Preferably, a second hydraulic rod is fixedly installed on the side of the grinding support perpendicular to the ground, and a roller bracket is fixedly installed at the output end of the second hydraulic rod near the inner side of the grinding support, and the diamond roller is fixedly installed on the roller bracket.

[0020] Preferably, the fixing device includes a positioning support, which is fixedly installed on one side of the bottom surface of the grinding support. The side of the positioning support near the first grinding wheel is set as an inclined surface. A swing arm is rotatably installed on the inclined surface of the positioning support. The swing arm has an L-shaped structure, and a swing arm motor is fixedly connected to the pivot of the swing arm.

[0021] Preferably, an end plate is rotatably mounted on the end of the swing arm away from the grinding support, and one side of the top surface of the end plate is inclinedly positioned directly below the first grinding wheel. An end plate motor is fixedly connected to the rotating shaft of the end plate, and an annular protrusion is provided on the outer wall of the end plate.

[0022] Preferably, a middle column is fixedly installed on the side of the end plate away from the end plate motor, and a connecting plate is fixedly installed on the side of the middle column away from the end plate. A plurality of positioning posts are provided on the surface of the connecting plate away from the middle column, and threaded holes are also provided on the surface of the connecting plate with the positioning posts.

[0023] Preferably, the fixing device includes a cover plate, the outer wall of the cover plate is provided with an annular protrusion, a plurality of insertion holes are provided on one side of the cover plate, the positioning pin can be inserted into the insertion holes of the cover plate, and a bolt is inserted and installed on the surface of the cover plate, the bolt passing through the cover plate and inserted into the threaded hole on the surface of the connecting plate.

[0024] Preferably, the separation structure includes a side push plate, and slots are provided on both sides of the middle column. The side push plate is slidably installed in the slots on both sides of the middle column. The outer end of the side push plate away from the end plate is inclined inward. A spring is embedded in the middle of the middle column, and the two ends of the spring are fixedly connected to the side push plate in the slots on both sides of the middle column.

[0025] Preferably, the separation structure includes a shaped rotating plate, which is rotatably installed at the middle of both ends of the central column. The shaped rotating plate is located between the side push plates on both sides. A steel shaft motor is embedded in the middle of one side of the connecting plate where the positioning column is located. The output end of the steel shaft motor is fixedly connected to a steel shaft. The steel shaft passes through the connecting plate and is inserted into the middle of the central column. The steel shaft is fixedly connected to the shaped rotating plate.

[0026] Preferably, the separation structure includes a shaped rotating plate, which is rotatably installed at the middle of both ends of the central column. The shaped rotating plate is located between the side push plates on both sides. A steel shaft motor is embedded in the middle of one side of the connecting plate where the positioning column is located. The output end of the steel shaft motor is fixedly connected to a steel shaft. The steel shaft passes through the connecting plate and is inserted into the middle of the central column. The steel shaft is fixedly connected to the shaped rotating plate.

[0027] The beneficial effects of this invention are as follows: First, a first grinding wheel is processed using a specially made diamond roller with a shape consistent with the curvature of the semi-inner circle and the small end reference surface. Then, the first grinding wheel is used to process the raceways and small end reference surfaces of the first and second semi-circles in sequence. Finally, the first and second semi-circles are used together to optimize the effect of traditional grinding methods. It also has the advantages of fewer factors affecting the precision of the product during processing, with the main indicators of groove center distance and groove curvature being directly affected by the diamond roller. The diamond roller has a long service life after being manufactured once, and one diamond roller can continuously process hundreds of thousands of products, so the product consistency is good. The small end reference surface and groove are ground in one go, making it easy to control the groove center distance of the product and ensuring good consistency. Attached Figure Description

[0028] Figure 1 A grinding schematic diagram of a high-precision four-point contact ball bearing double half-ring raceway grinding method provided by the present invention.

[0029] Figure 2 A front view of the grinding apparatus used in the high-precision four-point contact ball bearing double half-ring raceway grinding method provided by the present invention;

[0030] Figure 3 A front view of the grinding apparatus used in the high-precision four-point contact ball bearing double half-ring raceway grinding method provided by the present invention.

[0031] Figure 4 A schematic diagram of the installation of the cover plate of the grinding device used in the high-precision four-point contact ball bearing double half-ring raceway grinding method provided by the present invention.

[0032] Figure 5 Exploded view of the fixing device in the grinding apparatus used in the high-precision four-point contact ball bearing double half-ring raceway grinding method provided by the present invention.

[0033] Figure 6 A schematic diagram of the separation structure in the grinding device used in the high-precision four-point contact ball bearing double half-ring raceway grinding method provided by the present invention.

[0034] Figure 7 The internal structure diagram of the separation structure in the grinding device used in the high-precision four-point contact ball bearing double half-ring raceway grinding method provided by the present invention.

[0035] Figure 8 A schematic diagram of the old grinding method before the improvement of the double half-ring raceway grinding method for a high-precision four-point contact ball bearing provided by the present invention.

[0036] Figure 9 This invention provides a schematic diagram of the assembly of a double-half-ring bearing, produced by a method for grinding the raceways of a high-precision four-point contact ball bearing.

[0037] In the diagram: 4. First half-circle; 5. Second half-circle; 6. Integral outer ring; 7. Steel ball; 8. Shim; 9. Second grinding wheel; 10. Diamond pen; 11. Grinding support; 12. First hydraulic rod; 13. Grinding wheel bracket; 14. First grinding wheel; 15. Second hydraulic rod; 16. Roller bracket; 17. Diamond roller; 21. Positioning support; 22. Swing arm motor; 23. Swing arm; 24. End plate motor; 25. End plate; 26. Connecting plate; 27. Positioning column; 28. Cover plate; 29. ​​Bolt; 30. Middle column; 31. Side push plate; 32. Spring; 33. Irregular rotating plate; 34. Steel shaft; 35. Steel shaft motor. Detailed Implementation

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0039] Example 1

[0040] like Figure 1 and Figure 2 As shown, a method for grinding the raceways of a high-precision four-point contact ball bearing with double half rings according to the first aspect of the present invention includes steps one, two, three, four, five, and six, specifically using a first grinding wheel 14 and a diamond roller 17.

[0041] Step 1: After the first grinding wheel 14 is installed and fixed, drive the diamond roller 17 to one side to grind the first grinding wheel 14. After the first grinding wheel 14 is ground, the diamond roller 17 retracts and resets.

[0042] Step 2: Secure the double semicircles to the specially designed fixing device, and use the separation structure in the fixing device to separate the double semicircles;

[0043] Step 3: Place one half-circle directly below the first grinding wheel 14, drive the first grinding wheel 14 downward to grind one half-circle, and at the same time drive the half-circle to rotate using a special fixing device to process the raceway and small end reference surface of one half-circle. After processing, the first grinding wheel 14 is reset upward.

[0044] Step 4: Activate the special fixing device to flip the unprocessed half-circle to directly below the first grinding wheel 14, while the processed half-circle flips out from under the first grinding wheel 14.

[0045] Step 5: Drive the first grinding wheel 14 downward to grind the other half of the circle. At the same time, the special fixing device drives the other half of the circle to rotate, and process the raceway and small end reference surface of the half circle. After the processing is completed, the first grinding wheel 14 returns to the upward position.

[0046] Step 6: Remove the finished double half-circles from the fixing device and tighten them together before use.

[0047] In the above embodiments, it should be noted that the specially made diamond roller 17 is specially customized using a high-precision lathe. Its shape is consistent with the curvature of the semi-inner ring and the small end reference surface. The double semi-ring is divided into the first semi-ring 4 and the second semi-ring 5. First, the first grinding wheel 14 is processed by the specially made diamond roller 17 with the same shape as the curvature of the semi-inner ring and the small end reference surface. Then, the raceway and small end reference surface of the first semi-ring 4 and the second semi-ring 5 are processed by the first grinding wheel 14 in sequence. Finally, the first semi-ring 4 and the second semi-ring 5 are used together to optimize the effect of traditional grinding methods. It has the advantages of fewer factors affecting the accuracy of the product processing, and the main indicators of groove center distance and groove curvature are directly affected by the diamond roller 17. The diamond roller 17 has a long service life after one-time production. One diamond roller 17 can continuously process hundreds of thousands of products, so the product consistency is good. The small end reference surface and groove are ground in one go, and the groove center distance of the product is easy to control and has good consistency.

[0048] Example 2

[0049] like Figure 2 - Figure 4 As shown, a method for grinding the raceways of a high-precision four-point contact ball bearing with double half-rings includes all the contents of Example 1. In addition, in step one, the first grinding wheel 14 is rotatably connected to the grinding wheel bracket 13. The top surface of the grinding wheel bracket 13 is fixedly mounted with a first hydraulic rod 12. The upper end of the first hydraulic rod 12 is fixedly connected to a grinding support 11. The grinding support 11 has a C-shaped structure. The first hydraulic rod 12 is located on the top of the grinding support 11. A second hydraulic rod 15 is fixedly mounted on the side of the grinding support 11 perpendicular to the ground. A roller bracket 16 is fixedly mounted on the output end of the second hydraulic rod 15 near the inner side of the grinding support 11. The diamond roller 17 is fixedly mounted on the roller bracket 16.

[0050] In the above embodiments, it should be noted that the grinding support 11 is an alloy support, which is heavy and has good stability. A motor is installed on the grinding wheel support 13, and the first grinding wheel 14 is fixedly installed on the output end of the motor on the grinding wheel support 13. A motor is also installed on the roller support 16, and the diamond roller 17 is fixedly installed on the output end of the motor on the roller support 16. In the initial state, the first grinding wheel 14 is located on one side of the diamond roller 17. By activating the second hydraulic rod 15, the roller support 16 is pushed to drive the rotating diamond roller 17 to approach the first grinding wheel 14. At the same time, the first grinding wheel 14 itself is also driven to rotate by the motor to achieve the effect of grinding the first grinding wheel 14. Then, the first hydraulic rod 12 pushes the grinding wheel support 13 to drive the rotating first grinding wheel 14 to move downward to achieve the effect of grinding the first half-turn 4 or the second half-turn 5.

[0051] Example 3

[0052] like Figure 2 - Figure 5 As shown, a method for grinding the raceways of a high-precision four-point contact ball bearing with double half-rings includes all the contents of Example 2. Furthermore, the fixing device includes a positioning support 21, which is fixedly installed on one side of the bottom surface of the grinding support 11. The side of the positioning support 21 near the first grinding wheel 14 is set as an inclined surface. A swing arm 23 is rotatably mounted on the inclined surface of the positioning support 21. The swing arm 23 has an L-shaped structure. A swing arm motor 22 is fixedly connected to the pivot of the swing arm 23. An end plate 25 is rotatably mounted on the end of the swing arm 23 away from the grinding support 11. The top surface of the end plate 25 is inclinedly positioned directly below the first grinding wheel 14. An end plate motor 24 is fixedly connected to the pivot of the end plate 25. The outer wall of end plate 25 is provided with an annular protrusion. A middle column 30 is fixedly installed on the side of end plate 25 away from end plate motor 24. A connecting plate 26 is fixedly installed on the side of middle column 30 away from end plate 25. A plurality of positioning posts 27 are provided on the surface of the connecting plate 26 away from middle column 30. A threaded hole is also provided on the surface of the connecting plate 26 with positioning posts 27. The fixing device includes a cover plate 28. An annular protrusion is provided on the outer wall of cover plate 28. A plurality of insertion holes are provided on one side of cover plate 28. The positioning posts 27 can be inserted into the insertion holes of cover plate 28. A bolt 29 is inserted and installed on the surface of cover plate 28. The bolt 29 passes through cover plate 28 and is inserted into the threaded hole on the surface of connecting plate 26.

[0053] In the above embodiments, it should be noted that the first half-ring 4 and the second half-ring 5 are metal rings with the same structure before processing. The inner diameter of the first half-ring 4 and the second half-ring 5 is equal to the outer wall diameter of the end plate 25. The inner diameter of the first half-ring 4 and the second half-ring 5 is equal to the outer wall diameter of the middle column 30. The inner diameter of the first half-ring 4 and the second half-ring 5 is equal to the outer wall diameter of the connecting plate 26. The inner diameter of the first half-ring 4 and the second half-ring 5 is equal to the outer wall diameter of the cover plate 28. The diameter of the annular protrusion on the outer wall of the cover plate 28 is greater than the inner diameter of the first half-ring 4 and the second half-ring 5. The diameter of the annular protrusion on the outer wall of the end plate 25 is greater than the inner diameter of the first half-ring 4 and the second half-ring 5.

[0054] By sequentially passing the first half-circle 4 and the second half-circle 5 through the connecting plate 26 and fitting them onto the middle column 30, the first half-circle 4 will gradually slide to the outer wall of the end plate 25 under the action of gravity and be blocked by the annular protrusion of the end plate 25. The second half-circle 5 is located on the outer wall of the middle column 30 on one side of the first half-circle 4. Then, the cover plate 28 is fixed to the connecting plate 26 using bolts 29. Next, the separation structure is activated to push the second half-circle 5 to slide against gravity to the outer wall of the cover plate 28 and the connecting plate 26. Then, the end plate motor 24 is activated to drive the end plate 25, the middle column 30, the connecting plate 26, and the first half-circle 5 on the outer wall. The first half-circle 4 and the second half-circle 5 rotate, and finally the first grinding wheel 14 is started downward to achieve the effect of grinding the first half-circle 4. Then, the swing arm motor 22 is started to drive the swing arm 23 on the positioning support 21 to rotate 180°, so that the end plate 25, the middle column 30, the connecting plate 26 and the cover plate 28 are rotated 180°. At this time, the unprocessed second half-circle 5 is located below the first grinding wheel 14. The first grinding wheel 14 is started downward again to achieve the effect of grinding the second half-circle 5. Finally, the cover plate 28 is removed, and the processed first half-circle 4 and the second half-circle 5 are taken out and put together for use.

[0055] Example 4

[0056] like Figure 4 - Figure 7 As shown, a method for grinding the raceways of a high-precision four-point contact ball bearing with double half-rings includes all the contents of Example 3. Furthermore, the separation structure includes a side push plate 31, and slots are provided on both sides of the middle column 30. The side push plate 31 is slidably installed in the slots on both sides of the middle column 30. The outer end of the side push plate 31, away from the end plate 25, is inclined inward. A spring 32 is embedded in the middle of the middle column 30, and the two ends of the spring 32 respectively engage with the side push plates in the slots on both sides of the middle column 30. The plate 31 is fixedly connected. The separation structure includes a special-shaped rotating plate 33, which is rotatably installed at the middle of both ends of the middle column 30. The special-shaped rotating plate 33 is set between the side push plates 31 on both sides. A steel shaft motor 35 is embedded in the middle of one side of the connecting plate 26 where the positioning column 27 is provided. The output end of the steel shaft motor 35 is fixedly connected to a steel shaft 34. The steel shaft 34 passes through the connecting plate 26 and is inserted into the middle of the middle column 30. The steel shaft 34 is fixedly connected to the special-shaped rotating plate 33.

[0057] In the above embodiment, it should be noted that the spring 32 always applies a force to the two side push plates 31 to bring them closer together. By starting the steel shaft motor 35, the steel shaft 34 is driven to rotate the irregular rotating plate 33 by 90°. The irregular rotating plate 33 pushes open the two side push plates 31, so as to push the second half ring 5 to the outer wall of the cover plate 28 and the connecting plate 26, so that the second half ring 5 is separated from the first half ring 4. After the steel shaft motor 35 drives the steel shaft 34 to rotate and reset the irregular rotating plate 33, the spring 32 will drive the two side push plates 31 to automatically retract and reset.

[0058] Example 5

[0059] like Figure 1 , Figure 2 and Figure 9 As shown, a method for grinding the raceway of a double half-ring of a high-precision four-point contact ball bearing includes all the contents of Example 4. In addition, the double half-ring includes a first half-ring 4 and a second half-ring 5. The first half-ring 4 and the second half-ring 5 can be fitted onto the middle column 30 between the annular protrusion of the end plate 25 and the annular protrusion of the cover plate 28. The processed first half-ring 4 and the second half-ring 5 are symmetrical to each other and can be used together.

[0060] In the above embodiments, it should be noted that the first half-circle 4 and the second half-circle 5 are interference-fitted with the outer walls of the end plate 25, the middle column 30 and the connecting plate 26. However, the end plate 25, the middle column 30 and the connecting plate 26 are made of smooth metal material. At the same time, the end plate 25, the middle column 30 and the connecting plate 26 can form an inclined column. Therefore, without any external force, the first half-circle 4 and the second half-circle 5 can slowly slide on the outer walls of the end plate 25, the middle column 30 and the connecting plate 26.

[0061] The usage process of this invention is as follows: Those skilled in the art install and fix the first grinding wheel 14 on the grinding wheel bracket 13. The second hydraulic rod 15 is activated to push the roller bracket 16, causing the rotating diamond roller 17 to approach the first grinding wheel 14. Simultaneously, the first grinding wheel 14 itself is also driven to rotate by a motor to grind the first grinding wheel 14. Next, the first half-circle 4 and the second half-circle 5 are sequentially passed through the connecting plate 26 and fitted onto the middle column 30. The first half-circle 4 will gradually slide to the outer wall of the end plate 25 under the action of gravity and be blocked by the annular protrusion of the end plate 25. The second half-circle 5 is located on the outer wall of the middle column 30 on one side of the first half-circle 4. Then, bolts 29 are used to fix the cover plate 28 to the connecting plate 26, and the steel shaft motor 35 is activated to drive the grinding wheel. The steel shaft 34 drives the irregular rotating plate 33 to rotate 90°. The irregular rotating plate 33 pushes open the side push plates 31 on both sides, pushing the second half ring 5 to the outer wall of the cover plate 28 and the connecting plate 26, so that the second half ring 5 is separated from the first half ring 4. The first grinding wheel 14 is started downward to grind the first half ring 4. Then the swing arm motor 22 is started to drive the swing arm 23 on the positioning support 21 to rotate 180°, so that the end plate 25, the middle column 30, the connecting plate 26 and the cover plate 28 are rotated 180°. At this time, the unprocessed second half ring 5 is located below the first grinding wheel 14. The first grinding wheel 14 is started downward again to grind the second half ring 5. Finally, the cover plate 28 is removed, and the processed first half ring 4 and second half ring 5 are taken out and put together for use.

[0062] The above description is merely a preferred embodiment of the present invention. Any person skilled in the art can modify the present invention or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for grinding the raceways of a high-precision four-point contact ball bearing with two half rings, specifically using a first grinding wheel (14) and a diamond roller (17), characterized in that: Step 1: After the first grinding wheel (14) is installed and fixed, drive the diamond roller (17) to move to one side and grind the first grinding wheel (14). After the first grinding wheel (14) is ground, the diamond roller (17) retracts and resets. Step 2: Secure the double semicircles to the specially designed fixing device, and use the separation structure in the fixing device to separate the double semicircles; Step 3: Place one half-circle directly below the first grinding wheel (14), drive the first grinding wheel (14) to grind one half-circle downwards, and at the same time drive the half-circle to rotate using a special fixing device to process the raceway and small end reference surface of one half-circle. After processing, the first grinding wheel (14) is reset upwards. Step 4: Activate the special fixing device to flip the unprocessed half-circle directly under the first grinding wheel (14), while the processed half-circle flips out under the first grinding wheel (14); Step 5: Drive the first grinding wheel (14) downward to grind the other half of the circle. At the same time, the special fixing device drives the other half of the circle to rotate, and process the raceway and small end reference surface of the half of the circle. After the processing is completed, the first grinding wheel (14) returns to the starting position. Step 6: Remove the finished double half-circle from the fixing device, then tighten it together for use; In step one, the first grinding wheel (14) is rotatably connected to the grinding wheel bracket (13). A first hydraulic rod (12) is fixedly installed on the top surface of the grinding wheel bracket (13). The upper end of the first hydraulic rod (12) is fixedly connected to the grinding support (11). The grinding support (11) has a C-shaped structure. The first hydraulic rod (12) is located on the top of the grinding support (11). The fixing device includes a positioning support (21). The positioning support (21) is fixedly installed on one side of the bottom surface of the grinding support (11). The side of the positioning support (21) near the first grinding wheel (14) is set as an inclined surface. A swing arm (23) is rotatably mounted on the inclined surface of the positioning support (21). The swing arm (23) has an L-shaped structure. A swing arm motor (22) is fixedly connected to the pivot of the swing arm (23). An end plate (25) is rotatably mounted on the end of the swing arm (23) away from the grinding support (11). The top surface of the end plate (25) is inclined and located directly below the first grinding wheel (14). An end plate motor (24) is fixedly connected to the pivot of the end plate (25). An annular protrusion is provided on the outer wall of the end plate (25). The side of the end plate (25) away from the end plate motor (24) is fixedly mounted with... The device includes a central column (30), on which a connecting plate (26) is fixedly installed. A plurality of positioning posts (27) are provided on the surface of the connecting plate (26) away from the central column (30). A threaded hole is also provided on the surface of the connecting plate (26) on the side with the positioning posts (27). The fixing device includes a cover plate (28), with an annular protrusion on its outer wall. A plurality of insertion holes are provided on one side of the cover plate (28), allowing the positioning posts (27) to be inserted into the insertion holes of the cover plate (28). The surface of the cover plate (28)... A bolt (29) is inserted into the surface of the cover plate (28) and inserted into the threaded hole on the surface of the connecting plate (26). The separation structure includes a side push plate (31). The middle column (30) has slots on both sides. The side push plate (31) is slidably installed in the slots on both sides of the middle column (30). The side push plate (31) is inclined inward at the outer end away from the end plate (25). A spring (32) is embedded in the middle of the middle column (30). The two ends of the spring (32) are fixedly connected to the side push plate (31) in the slots on both sides of the middle column (30).

2. The method for grinding the raceways of double half-rings of a high-precision four-point contact ball bearing according to claim 1, characterized in that: The grinding support (11) is fixedly installed with a second hydraulic rod (15) on one side perpendicular to the ground. A roller bracket (16) is fixedly installed at the output end of the second hydraulic rod (15) near the inner side of the grinding support (11). The diamond roller (17) is fixedly installed on the roller bracket (16).

3. The method for grinding the raceways of double half-rings of a high-precision four-point contact ball bearing according to claim 1, characterized in that: The separation structure includes a shaped rotating plate (33), which is rotatably installed at the middle of both ends of the central column (30). The shaped rotating plate (33) is set between the side push plates (31) on both sides. A steel shaft motor (35) is embedded in the middle of one side of the connecting plate (26) with a positioning column (27). The output end of the steel shaft motor (35) is fixedly connected to a steel shaft (34). The steel shaft (34) passes through the connecting plate (26) and is inserted into the middle of the central column (30). The steel shaft (34) is fixedly connected to the shaped rotating plate (33).

4. The method for grinding the raceways of double half-rings of a high-precision four-point contact ball bearing according to claim 1, characterized in that: The double semicircle includes a first semicircle (4) and a second semicircle (5). The first semicircle (4) and the second semicircle (5) can be fitted onto the middle column (30) between the annular protrusion of the end plate (25) and the annular protrusion of the cover plate (28). The processed first semicircle (4) and the second semicircle (5) are symmetrical to each other and can be used together.

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