Double-half-ferrule raceway grinding method for high-precision four-point contact ball bearing

Abstract

The invention relates to the technical field of bearing machining, in particular to a double-half-ferrule raceway grinding method for a high-precision four-point contact ball bearing, and adopts the technical scheme that the double-half-ferrule raceway grinding method for the high-precision four-point contact ball bearing comprises the first step, the second step, the third step, the fourth step, the fifth step and the sixth step; the method has the beneficial effects that the first grinding wheel is machined through the special diamond roller with the shape consistent with the curvature of the half inner ring and the small-end datum plane, then the first grinding wheel is used for sequentially machining the raceways of the first half ring and the second half ring and the small-end datum plane, and finally the first half ring and the second half ring are tightly combined for use, so that the effect of optimizing a traditional grinding method is achieved; the diamond roller is long in service life after being manufactured at a time; hundreds of thousands of products can be continuously machined; the groove center distance of the products is easy to control; the consistency is good, and the like.

Description

Technical Field

[0001] The invention relates to the technical field of bearing processing, and in particular to a double-half-ring raceway grinding method of a high-precision four-point contact ball bearing. Background Art

[0002] High precision four-point contact ball bearings (such as Fig. 9 ) is an angular contact ball bearing with a separable inner or outer ring, which can bear bidirectional axial loads. Its inner and outer ring raceways are peach-shaped in cross-section. When there is no load or a pure radial load, the steel ball 7 and the ring are in a four-point contact state; the bearing contact angle is the contact angle formed by the steel ball 7 and the ring raceway, which is an important indicator of the four-point contact ball bearing. The precision of this indicator directly affects the stability of the bearing under working conditions, service life, axial load capacity and many other performance indicators.

[0003] Since the inner ring of the bearing is divided into half (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 and can only be indirectly controlled through the groove curvature and the groove center distance.

[0004] At present, the following methods are often used for raceway grinding when using double half inner ring or outer ring: Figure 8 As shown, place the gasket 8 between the first half circle 4 and the second half circle 5 and tighten them. The thickness of the gasket is the same as the groove center distance. Use a diamond pen 10 to trim 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 the processing is completed, remove the gasket 8, tighten the half circle 4 and the second half circle 5 and then use them.

[0005] This grinding method has the following disadvantages:

[0006] (1) In the process of grinding the "heart-shaped groove" with the first half circle 4 and the second half circle 5 with the shim 8, the thickness of different shims 8 has a processing error, which will directly affect the groove center distance after removing the shim 8, and further affect the finished contact angle of the bearing;

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

[0008] (3) The surface quality of the first half circle 4 and the second half circle 5 reference surface and the contact surface of the gasket 8 is highly required. If there are burrs, foreign matter or large defects, the quality of the processed product will be greatly affected;

[0009] (4) Each set of the first half circle 4 and the second half circle 5 needs to be installed with a gasket 8 and needs to be tightened. After the processing is completed, the gasket 8 needs to be removed, which is too inefficient and not suitable for mass production.

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

[0011] In order to achieve the above object, the present invention provides the following technical solution: a method for grinding double half ring raceways of a high-precision four-point contact ball bearing, comprising steps 1, 2, 3, 4, 5 and 6, specifically using a first grinding wheel and a diamond roller,

[0012] Step 1: After the first grinding wheel is installed and fixed, the diamond roller is driven to one side to grind the first grinding wheel, and after the grinding of the first grinding wheel is completed, the diamond roller is retracted and reset;

[0013] Step 2: Fix the double half-circles on a specially made fixing device, and separate the double half-circles using the separation structure in the fixing device;

[0014] Step 3: one of the half circles is set directly under the first grinding wheel, and the first grinding wheel is driven downward to grind one of the half circles. At the same time, a special fixing device drives the half circle to rotate, and the raceway and small end reference surface of one of the half circles are processed. After the processing is completed, the first grinding wheel is reset upward;

[0015] Step 4: Start the special fixture to flip the unprocessed half circle to the bottom of the first grinding wheel, and flip the processed half circle out from under the first grinding wheel;

[0016] Step 5: Drive the first grinding wheel downward again to grind another half circle, and at the same time, the special fixing device drives the other half circle to rotate, so as to process the raceway and small end reference surface of the half circle. After the processing is completed, the first grinding wheel is reset upward again;

[0017] Step 6. Remove the double half circles processed on the fixing device and then tighten them for use.

[0018] Preferably, the first grinding wheel in step one is rotatably connected to a grinding wheel bracket, 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, the grinding support is a C-shaped structure, and the first hydraulic rod is arranged on the top of the grinding support.

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

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

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

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

[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 column can be inserted into the cover plate insertion hole, the surface of the cover plate is inserted with bolts, the bolts pass through the cover plate and are inserted into the threaded holes on the surface of the connecting plate.

[0024] Preferably, the separation structure includes a side push plate with slots on both sides of the middle-end column. The side push plate is slidably installed in the slots on both sides of the middle-end 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-end column, and both ends of the spring are fixedly connected to the side push plates in the slots on both sides of the middle-end column.

[0025] Preferably, the separation structure includes a special-shaped rotating plate, which is rotatably installed in the middle of both ends of the middle-end column, and the special-shaped rotating plate is arranged between the side thrust plates on both sides. The connecting plate is provided with a positioning column, and a steel shaft motor is embedded and installed in the middle of one side. The output end of the steel shaft motor is fixedly connected to the steel shaft, and the steel shaft passes through the connecting plate and is inserted into the middle of the middle-end column. The steel shaft is fixedly connected to the special-shaped rotating plate.

[0026] Preferably, the separation structure includes a special-shaped rotating plate, which is rotatably installed in the middle of both ends of the middle-end column, and the special-shaped rotating plate is arranged between the side thrust plates on both sides. The connecting plate is provided with a positioning column, and a steel shaft motor is embedded and installed in the middle of one side. The output end of the steel shaft motor is fixedly connected to the steel shaft, and the steel shaft passes through the connecting plate and is inserted into the middle of the middle-end column. The steel shaft is fixedly connected to the special-shaped rotating plate.

[0027] The beneficial effects of the present invention are as follows: the first grinding wheel is first processed by a special diamond roller whose shape is consistent with the curvature of the semi-inner circle and the small end reference surface, and then the raceways and small end reference surfaces of the first half circle and the second half circle are processed in turn by the first grinding wheel, and finally the first half circle and the second half circle are used closely together to achieve the effect of optimizing the traditional grinding method, and there are few factors affecting the accuracy during product processing, and its main indicators, the groove center distance and the groove curvature, are 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 consistency of the products is good; the small circle small end reference surface and the groove are ground at one time, and the groove center distance of the product is easy to control and has good consistency, etc. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

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

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

[0036] Fig. 9 A schematic diagram of the assembly of a double half-ring bearing processed by a double half-ring raceway grinding method for a high-precision four-point contact ball bearing provided by the present invention.

[0037] In the figure: the first half circle 4, the second half circle 5, the integral outer ring 6, the steel ball 7, the gasket 8, the second grinding wheel 9, the diamond pen 10, the grinding support 11, the first hydraulic rod 12, the grinding wheel bracket 13, the first grinding wheel 14, the second hydraulic rod 15, the roller bracket 16, the diamond roller 17, the positioning support 21, the swing arm motor 22, the swing arm 23, the end plate motor 24, the end plate 25, the connecting plate 26, the positioning column 27, the cover plate 28, the bolt 29, the middle end column 30, the side thrust plate 31, the spring 32, the special-shaped rotating plate 33, the steel shaft 34, and the steel shaft motor 35. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0039] Example 1

[0040] like Figure 1 and Figure 2 As shown, a method for grinding double half-ring raceways of a high-precision four-point contact ball bearing in an embodiment of the first aspect of the present invention comprises step one, step two, step three, step four, step five and step 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, the diamond roller 17 is driven to advance to one side and grind the first grinding wheel 14. After the grinding of the first grinding wheel 14 is completed, the diamond roller 17 is retracted and reset;

[0042] Step 2: Fix the double half-circles on a specially made fixing device, and separate the double half-circles using the separation structure in the fixing device;

[0043] Step 3: one of the half circles is set directly under the first grinding wheel 14, and the first grinding wheel 14 is driven to grind one of the half circles downwards. At the same time, a special fixing device drives the half circle to rotate, and the raceway and small end reference surface of one of the half circles are processed. After the processing is completed, the first grinding wheel 14 is reset upwards;

[0044] Step 4: Start the special fixing device to flip the unprocessed half circle to the bottom of the first grinding wheel 14, and flip the processed half circle out from under the first grinding wheel 14;

[0045] Step 5: Drive the first grinding wheel 14 downward again to grind another half circle, and at the same time, the special fixing device drives another half circle to rotate, so as to process the raceway and the small end reference surface of the half circle. After the processing is completed, the first grinding wheel 14 is reset upward again;

[0046] Step 6. Remove the double half circles processed on the fixing device and then tighten them for use.

[0047] In the above embodiment, it should be noted that the special diamond roller 17 is specially customized using a high-precision lathe, and its shape is consistent with the curvature of the semi-inner circle and the small end reference surface. The double half circle is divided into a first half circle 4 and a second half circle 5; the first grinding wheel 14 is first processed by the special diamond roller 17 whose shape is consistent with the curvature of the semi-inner circle and the small end reference surface, and then the raceways and small end reference surfaces of the first half circle 4 and the second half circle 5 are processed in sequence by the first grinding wheel 14, and finally the first half circle 4 and the second half circle 5 are used closely together to achieve the effect of optimizing the traditional grinding method, and has the advantages of fewer factors affecting the accuracy during product processing, and its main indicators, the groove center distance and the groove curvature, are directly affected by the diamond roller 17; the diamond roller 17 has a long service life after being manufactured once, and one diamond roller 17 can continuously process hundreds of thousands of products, so the consistency of the products is good; the small circle small end reference surface and the groove are ground at one time, 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 double half-ring raceways of a high-precision four-point contact ball bearing includes all the contents of Example 1. In addition, the first grinding wheel 14 in step one is rotatably connected to a 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 a grinding support 11, the grinding support 11 is a C-shaped structure, the first hydraulic rod 12 is arranged on the top of the grinding support 11, a second hydraulic rod 15 is fixedly installed on one side of the grinding support 11 perpendicular to the ground, a roller bracket 16 is fixedly installed on the output end of the second hydraulic rod 15 close to the inner side of the grinding support 11, and the diamond roller 17 is fixedly installed on the roller bracket 16.

[0050] In the above embodiment, it should be noted that the grinding support 11 is an alloy support with heavy weight and good stability. A motor is installed on the grinding wheel bracket 13, and the first grinding wheel 14 is fixedly installed on the output end of the motor on the grinding wheel bracket 13. A motor is also installed on the roller bracket 16, and the diamond roller 17 is fixedly installed on the output end of the motor on the roller bracket 16; in the initial state, the first grinding wheel 14 is located on one side of the diamond roller 17, and the second hydraulic rod 15 is started to push the roller bracket 16 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 bracket 13 to drive the rotating first grinding wheel 14 to move downward, so as to achieve the effect of grinding the first half circle 4 or the second half circle 5.

[0051] Example 3

[0052] like Figure 2 - Figure 5 As shown, a method for grinding double half-ring raceways of a high-precision four-point contact ball bearing includes all the contents of Example 2. In addition, the fixing device includes a positioning support 21, and 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 close to the first grinding wheel 14 is set as an inclined surface. A swing arm 23 is rotatably installed on the inclined surface of the positioning support 21. The swing arm 23 is an L-shaped structure. The swing arm 23 is fixedly connected to a swing arm motor 22 at the rotating shaft. An end plate 25 is rotatably installed at one end of the swing arm 23 away from the grinding support 11. One side of the top surface of the end plate 25 is tilted and arranged directly below the first grinding wheel 14. The end plate 25 is fixedly connected to the end plate motor 24 at the rotating shaft. An annular protrusion is provided on the outer wall of the end plate 25, a middle-end column 30 is fixedly installed on the side of the end plate 25 away from the end plate motor 24, a connecting plate 26 is fixedly installed on the side of the middle-end column 30 away from the end plate 25, a plurality of positioning columns 27 are provided on the surface of the connecting plate 26 away from the middle-end column 30, a threaded hole is also provided on the surface of the connecting plate 26 on which the positioning columns 27 are provided, the fixing device comprises a cover plate 28, an annular protrusion is provided on the outer wall of the cover plate 28, a plurality of insertion holes are provided on one side of the cover plate 28, the positioning columns 27 can be inserted into the insertion holes of the cover plate 28, bolts 29 are inserted and installed on the surface of the cover plate 28, the bolts 29 penetrate the cover plate 28 and are inserted into the threaded holes on the surface of the connecting plate 26.

[0053] In the above embodiment, it should be noted that the first half circle 4 and the second half circle 5 are metal rings with the same structure before processing, the inner diameter of the first half circle 4 and the second half circle 5 is equal to the outer wall diameter of the end plate 25, the inner diameter of the first half circle 4 and the second half circle 5 is equal to the outer wall diameter of the middle end column 30, the inner diameter of the first half circle 4 and the second half circle 5 is equal to the outer wall diameter of the connecting plate 26, the inner diameter of the first half circle 4 and the second half circle 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 larger than the inner diameter of the first half circle 4 and the second half circle 5, and the diameter of the annular protrusion on the outer wall of the end plate 25 is larger than the inner diameter of the first half circle 4 and the second half circle 5;

[0054] By passing the first half circle 4 and the second half circle 5 through the connecting plate 26 in sequence and sleeved on the middle end 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, and the second half circle 5 will be on the outer wall of the middle end column 30 on one side of the first half circle 4. Then, the cover plate 28 is fixed to the connecting plate 26 with bolts 29, and then the separation structure is started to push the second half circle 5 to overcome gravity and slide to the outer wall of the cover plate 28 and the connecting plate 26, and then the end plate motor 24 is started to drive the end plate 25, the middle end column 30, the connecting plate 26 and the first half circle 5 of the outer wall. The 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 end column 30, the connecting plate 26 and the cover plate 28 are turned 180°. At this time, the unprocessed second half circle 5 is located below the first grinding wheel 14, and 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 second half circle 5 are taken out, and they can be assembled together for use.

[0055] Example 4

[0056] like Figure 4 - Figure 7 As shown, a double half-ring raceway grinding method for a high-precision four-point contact ball bearing includes all the contents of Example 3. In addition, the separation structure includes a side push plate 31, and slots are set on both sides of the middle end column 30. The side push plate 31 is slidably installed in the slots on both sides of the middle end column 30. The outer end of the side push plate 31 away from the end plate 25 is inclined inwardly. A spring 32 is embedded in the middle of the middle end column 30. The two ends of the spring 32 are respectively connected to the side push plates in the slots on both sides of the middle end column 30. The plate 31 is fixedly connected, and the separation structure includes a special-shaped rotating plate 33, which is rotatably installed in the middle of both ends of the middle-end column 30, and the special-shaped rotating plate 33 is arranged between the side thrust plates 31 on both sides. The connecting plate 26 is provided with a positioning column 27, and a steel shaft motor 35 is embedded in the middle of one side. The output end of the steel shaft motor 35 is fixedly connected to the steel shaft 34, and the steel shaft 34 passes through the connecting plate 26 and is inserted into the middle of the middle-end 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 gives a force to the side push plates 31 on both sides to move closer to each other. By starting the steel shaft motor 35 to drive the steel shaft 34 to drive the special-shaped rotating plate 33 to rotate 90°, the special-shaped rotating plate 33 pushes open the side push plates 31 on both sides to achieve the effect of pushing the second half circle 5 to the outer wall of the cover plate 28 and the connecting plate 26, so that the second half circle 5 is separated from the first half circle 4; after the steel shaft motor 35 drives the steel shaft 34 to drive the special-shaped rotating plate 33 to rotate and reset, the spring 32 will drive the side push plates 31 on both sides to automatically shrink and reset.

[0058] Example 5

[0059] like Figure 1 , Figure 2 and Fig. 9 As shown, a method for grinding the double half-ring raceway 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 sleeved and installed on the middle end 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 tightly.

[0060] In the above embodiment, it should be noted that the first half circle 4 and the second half circle 5 are interference fit with the outer walls of the end plate 25, the middle column 30 and the connecting plate 26, but the end plate 25, the middle column 30 and the connecting plate 26 are made of metal with smooth surfaces, and at the same time, the end plate 25, the middle column 30 and the connecting plate 26 can form an inclined column, so 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 without any external force.

[0061] The use process of the present invention is as follows: a technician in this field installs and fixes the first grinding wheel 14 on the grinding wheel bracket 13, starts the second hydraulic rod 15 to push the roller bracket 16 to drive the rotating diamond roller 17 to approach the first grinding wheel 14, and at the same time the first grinding wheel 14 itself is also driven by the motor to rotate to grind the first grinding wheel 14; then the first half circle 4 and the second half circle 5 are passed through the connecting plate 26 in turn and sleeved on the middle end 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, and the second half circle 5 will be on the outer wall of the middle end column 30 on one side of the first half circle 4. Then, the cover plate 28 is fixed to the connecting plate 26 with the bolts 29, and the steel shaft motor 35 is started to drive The steel shaft 34 drives the special-shaped rotating plate 33 to rotate 90°, and the special-shaped rotating plate 33 pushes open the side push plates 31 on both sides, and pushes the second half circle 5 to the outer wall of the cover plate 28 and the connecting plate 26, so that the second half circle 5 is separated from the first half circle 4, and the first grinding wheel 14 is started downward to grind the first half circle 4, and 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 end column 30, the connecting plate 26 and the cover plate 28 are turned 180°. At this time, the unprocessed second half circle 5 is located below the first grinding wheel 14, and the first grinding wheel 14 is started downward again to grind the second half circle 5, and finally the cover plate 28 is removed, and the processed first half circle 4 and second half circle 5 are taken out, and they can be assembled together for use.

[0062] The above is only a preferred embodiment of the present invention. Any person skilled in the art may modify the present invention by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for grinding double half-ring raceways of a high-precision four-point contact ball bearing, comprising steps 1, 2, 3, 4, 5 and 6, 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, the diamond roller (17) is driven to advance to one side and grind the first grinding wheel (14); after the grinding of the first grinding wheel (14) is completed, the diamond roller (17) is retracted and reset; Step 2: Fix the double half-circles on a specially made fixing device, and separate the double half-circles using the separation structure in the fixing device; Step 3, one of the half circles is arranged directly below the first grinding wheel (14), and the first grinding wheel (14) is driven to grind one of the half circles downwards, and at the same time, a specially made fixing device drives the half circle to rotate, so as to process the raceway and the small end reference surface of one of the half circles, and after the processing is completed, the first grinding wheel (14) is reset upwards; Step 4: Start the special fixing device to flip the unprocessed half circle to the bottom of the first grinding wheel (14), and at the same time flip the processed half circle out from under the first grinding wheel (14); Step 5, the first grinding wheel (14) is driven downward again to grind another half circle, and at the same time, the special fixing device drives another half circle to rotate, so as to process the raceway and the small end reference surface of the half circle, and after the processing is completed, the first grinding wheel (14) is reset upward again; Step 6. Remove the double half circles processed on the fixing device and then tighten them for use.

2. The method for grinding the double half ring raceways of a high-precision four-point contact ball bearing according to claim 1, characterized in that: The first grinding wheel (14) in step one is rotatably connected to a grinding wheel bracket (13), a first hydraulic rod (12) is fixedly mounted on the top surface of the grinding wheel bracket (13), an upper end of the first hydraulic rod (12) is fixedly connected to a grinding support (11), the grinding support (11) is a C-shaped structure, and the first hydraulic rod (12) is arranged on the top of the grinding support (11).

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

4. The method for grinding the double half-ring raceways of a high-precision four-point contact ball bearing according to claim 2, characterized in that: The fixing device comprises a positioning support (21), wherein the positioning support (21) is fixedly mounted on one side of the bottom surface of the grinding support (11), wherein a side of the positioning support (21) close to the first grinding wheel (14) is arranged as an inclined surface, and a swing arm (23) is rotatably mounted on the inclined surface of the positioning support (21), wherein the swing arm (23) is in an L-shaped structure, and a swing arm motor (22) is fixedly connected to the rotating shaft of the swing arm (23).

5. The method for grinding the double half ring raceways of a high-precision four-point contact ball bearing according to claim 4, characterized in that: An end plate (25) is rotatably mounted on one end of the swing arm (23) away from the grinding support (11); one side of the top surface of the end plate (25) is tilted and arranged directly below the first grinding wheel (14); the end plate motor (24) is fixedly connected to the rotating shaft of the end plate (25); and an annular protrusion is arranged on the outer wall of the end plate (25).

6. The method for grinding the double half-ring raceways of a high-precision four-point contact ball bearing according to claim 5, characterized in that: A middle end column (30) is fixedly mounted on the side of the end plate (25) away from the end plate motor (24), a connecting plate (26) is fixedly mounted on the side of the middle end column (30) away from the end plate (25), a surface of the connecting plate (26) away from the middle end column (30) is provided with a plurality of positioning columns (27), and a surface of the connecting plate (26) on one side provided with the positioning columns (27) is also provided with threaded holes.

7. The method for grinding the double half-ring raceways of a high-precision four-point contact ball bearing according to claim 6, characterized in that: The fixing device comprises a cover plate (28), the outer wall of the cover plate (28) is provided with an annular protrusion, one side of the cover plate (28) is provided with a plurality of insertion holes, the positioning column (27) can be inserted into the insertion hole of the cover plate (28), the surface of the cover plate (28) is inserted with a bolt (29), and the bolt (29) passes through the cover plate (28) and is inserted into a threaded hole on the surface of the connecting plate (26).

8. The method for grinding the double half-ring raceways of a high-precision four-point contact ball bearing according to claim 6, characterized in that: The separation structure comprises a side push plate (31), and slots are arranged on both sides of the middle end column (30). The side push plate (31) is slidably installed in the slots on both sides of the middle end column (30), and one end of the outer side of the side push plate (31) away from the end plate (25) is inclined inwardly. A spring (32) is embedded and installed in the middle of the middle end column (30), and both ends of the spring (32) are respectively fixedly connected to the side push plates (31) in the slots on both sides of the middle end column (30).

9. The method for grinding the double half-ring raceways of a high-precision four-point contact ball bearing according to claim 8, characterized in that: The separation structure comprises a special-shaped rotating plate (33), the special-shaped rotating plate (33) is rotatably mounted in the middle of both ends of the middle-end column (30), the special-shaped rotating plate (33) is arranged between the side push plates (31) on both sides, the connecting plate (26) is provided with a positioning column (27) on the middle of one side of which a steel shaft motor (35) is embedded and installed, 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-end column (30), and the steel shaft (34) is fixedly connected to the special-shaped rotating plate (33).

10. The method for grinding the double half ring raceways of a high-precision four-point contact ball bearing according to claim 7, characterized in that: The double half circle comprises a first half circle (4) and a second half circle (5). The first half circle (4) and the second half circle (5) can be sleeved and installed on the middle end column (30) between the annular protrusion of the end plate (25) and the annular protrusion of the cover plate (28). The first half circle (4) and the second half circle (5) are symmetrical to each other and can be used tightly together.

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