Automobile bearing ring superfinishing equipment and method

Abstract

The application provides an automobile bearing ring superfinishing device and method, and relates to the field of automobile bearing ring superfinishing. The automobile bearing ring superfinishing device comprises a machine box, a rotating mechanism, a drive assembly, a plurality of clamping mechanisms and a plurality of through grooves. The rotating mechanism is installed in the machine box and comprises an inner gear ring and a rotating support installed on the outer side of the inner gear ring. The rotating support is rotationally connected in the machine box. The inner side of the inner gear ring is provided with the plurality of clamping mechanisms. The top wall of the machine box is circumferentially distributed and provided with the plurality of through grooves for the working of the clamping mechanisms. The drive assembly is arranged on the top of the machine box. The X-axis drive mechanism, the Y-axis drive mechanism and the Z-axis drive mechanism form a three-dimensional drive mechanism for driving the superfinishing assembly to superfinish the inner edge of the automobile bearing ring. The steel ball and the oil stone are arranged on the superfinishing support in cooperation with each other, so that the machining parameters of the automobile bearing ring after machining are uniform, and the machining quality is stable.

Description

Technical Field

[0001] This invention relates to the field of ultra-precision machining technology for bicycle bearing rings, specifically to an ultra-precision machining equipment and method for automotive bearing rings. Background Technology

[0002] Automotive bearings, also known as wheel bearings, are one of the key components of a car. Their main function is to bear weight and provide precise guidance for the rotation of the wheel hub. This requires them to withstand not only axial loads but also radial loads. Automotive wheel bearings have evolved from the initial first-generation double-row angular contact ball bearings to the third-generation ABS sensor-integrated type. The third-generation wheel bearing unit uses a bearing unit in conjunction with the anti-lock braking system (ABS). The wheel unit is designed with an inner flange and an outer flange. The inner flange is bolted to the drive shaft, and the outer flange mounts the entire bearing together.

[0003] Although automotive bearing rings have undergone many developments, their function remains the same: when in use, the inner and outer rings combine to make the balls rotate, thus achieving the lateral and longitudinal load matching of the automobile.

[0004] When performing ultra-precision grinding on the raceways of existing automotive bearing rings, ultra-precision machines are typically used to grind the inner or outer raceways. These machines usually process these parts one at a time, resulting in low efficiency. Current ultra-precision machines for grinding the raceways of automotive bearing rings rely heavily on sensor-based digital monitoring to control all parameters during the ultra-precision grinding process of each bearing within acceptable limits. However, this approach inevitably presents a problem: while the processing parameters for each bearing ring may fall within acceptable limits, the parameters for each bearing ring are different. Therefore, in actual mass production, the combined tolerances of the inner and outer rings can potentially increase the rate of misfitting. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an ultra-precision machining equipment and method for automotive bearing rings, solving the problems of inconsistent grinding parameters and low machining efficiency in the existing automotive bearing ring machining process.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ultra-precision machining equipment for automotive bearing rings, comprising:

[0007] Chassis;

[0008] A rotating mechanism is installed inside a chassis. The rotating mechanism includes an internal gear ring and a rotating bracket installed on the outside of the internal gear ring. The rotating bracket is rotatably connected inside the chassis. A drive motor is fixedly connected to the bottom of the internal gear ring through a reducer. The drive motor is installed inside the chassis. Multiple clamping mechanisms are provided on the inner side of the internal gear ring. Multiple through slots for the clamping mechanisms to work are distributed circumferentially on the top wall of the chassis.

[0009] A drive assembly is located on the top of the chassis. The drive assembly includes an X-axis drive mechanism, a Y-axis drive mechanism, a Z-axis drive mechanism, and a precision grinding assembly. The X-axis drive mechanism, the Y-axis drive mechanism, and the Z-axis drive mechanism form a three-dimensional drive mechanism to drive the precision grinding assembly to precision grind the inner edge of the automotive bearing ring.

[0010] The precision grinding assembly includes a polygonal frame and multiple L-shaped precision grinding supports evenly distributed at the bottom of the polygonal frame. The multiple precision grinding supports face the same direction and are all horizontally positioned at their lower ends. Each of the multiple precision grinding supports has an oilstone bolted to its lower end. A steel ball is rotatably mounted on the lower end of one of the precision grinding supports. One side of the steel ball abuts against a contact rod, and the other end of the contact rod abuts against a pressure sensor. The contact rod slides within the precision grinding support, and the pressure sensor is located within the precision grinding support.

[0011] Each of the clamping mechanisms includes a base and gears mounted on the bottom of the base. The gears are distributed in a circumferential manner and are all meshed on the inner side of the internal gear ring. The base is rotatably mounted on the inner wall of the chassis. The top of the base is provided with multiple mounting slots in a circumferential shape, and multiple extension mechanisms are provided in the mounting slots.

[0012] The extension mechanism includes support arms evenly distributed on the side wall of the pier. Each support arm is hinged to an electric telescopic rod at its top end. Each electric telescopic rod is hinged to a rotating seat at its drive end. Each rotating seat is hinged in a mounting groove. A workstation is provided on the top of the pier, and an automotive bearing ring is provided on the workstation.

[0013] Preferably, the X-axis drive mechanism, Y-axis drive mechanism, and Z-axis drive mechanism are all identical. Each of the X-axis drive mechanism, Y-axis drive mechanism, and Z-axis drive mechanism includes a slide rail, a slide block, a ball screw, and a synchronous motor. The slide block slides within the slide rail, the ball screw is connected to the slide block via a nut pair, the ball screw rotates within the slide rail, and one end of the ball screw passes through the slide rail and is connected to the synchronous motor via a coupling.

[0014] Preferably, there are two X-axis drive mechanisms symmetrically mounted on the top of the chassis. Each X-axis drive mechanism has a set of vertical rods fixed on its slide. Each set of vertical rods has a horizontally arranged crossbar fixed at its top. Both ends of each crossbar are connected to the Y-axis drive mechanism. Each Y-axis drive mechanism has a slide connected to the slide rail of the Z-axis drive mechanism. Each Z-axis drive mechanism has a connecting rod fixed to its slide. The sides of the connecting rods that are close to each other are fixed to the polygonal frame.

[0015] Preferably, the polygonal frame is centrally symmetrically arranged, the number of the fine grinding brackets and the clamping mechanism are the same, and the fine grinding brackets are all arranged one-to-one above the clamping mechanism.

[0016] Preferably, a method for ultra-precision machining of automotive bearing rings, using the ultra-precision machining equipment for automotive bearing rings described above, includes the following steps:

[0017] Step S1, Installation: Select a car bearing ring to be processed and process it into a qualified product on the bearing ultra-precision machine. Set the qualified product as a processing sample on the bearing platform of the clamping mechanism directly below the precision grinding support with steel balls. Then, place the car bearing rings to be ultra-precision processed on the other bearing platforms. The electric telescopic rod in the extension mechanism extends with the support arm to make the rotating seat on each clamping mechanism move synchronously to clamp and fix the car bearing rings on the corresponding bearing platforms. After installation, the center lines of each car bearing ring and the bearing platform are on the same straight line.

[0018] Step S2, Machining: The X-axis drive mechanism, Y-axis drive mechanism, and Z-axis drive mechanism work together to bring the precision grinding bracket with oilstone close to the position of the automotive bearing ring that needs to be ground. When one of the precision grinding brackets with steel balls is at the same position on the automotive bearing ring, the drive motor drives the internal gear ring to rotate through the reducer. When the internal gear ring rotates in the machine box through the rotating bracket, multiple gears rotate synchronously in the same direction. The gears drive the bearing platform to rotate, and the automotive bearing ring on the bearing platform rotates synchronously.

[0019] Step S3, Movement: After the oilstone grinds and reduces the corresponding part of the car bearing ring, the steel ball contacts the corresponding position surface of the qualified car bearing ring and rotates, then squeezes the contact rod to make the pressure sensor display a value. After the pressure sensor displays the contact value, the oilstone is moved by the X-axis drive mechanism, Y-axis drive mechanism and Z-axis drive mechanism working together to grind other parts of the car bearing ring.

[0020] This invention provides an ultra-precision machining equipment and method for automotive bearing rings. It has the following beneficial effects:

[0021] This invention uses a qualified automotive bearing ring as a processing reference model. Then, through the coordinated operation of X-axis, Y-axis, and Z-axis drive mechanisms, a grinding bracket with an oilstone is brought close to the area of ​​the automotive bearing ring requiring grinding. One of the grinding brackets, containing a steel ball 30, is positioned at the same location on the bearing ring. A drive motor, via a reducer, drives an internal gear ring to rotate. As the internal gear ring rotates within the machine housing via a rotating bracket, multiple gears rotate synchronously in the same direction. These gears drive the bearing platform to rotate, causing the automotive bearing ring on the platform to rotate synchronously. After the oilstone grinds and reduces the corresponding area of ​​the automotive bearing ring, the steel ball contacts the qualified bearing ring. The corresponding position surface of the car bearing ring rotates, which then presses against the contact rod, causing the pressure sensor to display a value. After the pressure sensor displays the contact value, the X-axis drive mechanism, Y-axis drive mechanism, and Z-axis drive mechanism work together to move the oilstone and grind other parts of the car bearing ring. This setting ensures that each bearing ring being precision ground has similar processing parameters during the processing. The parameters of bearing rings processed in the same batch are all within the model parameter range, making the quality of bearing rings processed in the batch similar. This improves the yield rate during subsequent assembly, and the similar parameters of the bearing rings ensure the stability of the processed product quality.

[0022] This invention utilizes a polygonal frame and a precision grinding bracket in conjunction with multiple clamping mechanisms to enable the processing of multiple automotive bearing rings at once, thereby improving the processing efficiency of automotive bearing rings and enhancing the stability of batch quality. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention;

[0024] Figure 2 This is a perspective view of the rotating mechanism of the present invention;

[0025] Figure 3 This is a perspective view of the clamping mechanism of the present invention;

[0026] Figure 4 This is a perspective view of the extension mechanism of the present invention;

[0027] Figure 5 This is a perspective view of the grinding component of the present invention;

[0028] Figure 6 This is a perspective view of the driving component of the present invention;

[0029] Figure 7 This is a perspective view of the Z-axis drive mechanism of the present invention;

[0030] Figure 8 This is a partial view of the connection between the precision grinding support and the oilstone of the present invention;

[0031] Figure 9This is a partial view of the connection between the precision-ground support and the steel ball of the present invention;

[0032] Figure 10 This is a cross-sectional view of the connection between the precision-ground support and the steel ball of the present invention.

[0033] The components are as follows: 1. Chassis; 2. X-axis drive mechanism; 3. Vertical rod; 4. Horizontal rod; 5. Y-axis drive mechanism; 6. Z-axis drive mechanism; 7. Connecting rod; 8. Polygonal frame; 9. Precision grinding support; 10. Rotation mechanism; 11. Drive assembly; 12. Drive motor; 13. Rotating support; 14. Internal gear ring; 15. Gear; 16. Support platform; 17. Extension mechanism; 18. Support arm; 19. Electric telescopic rod; 20. Rotating seat; 21. Mounting slot; 22. Clamping mechanism; 23. Precision grinding assembly; 24. Contact rod; 25. Oilstone; 26. Synchronous motor; 27. Slide rail; 28. Slide seat; 29. ​​Ball screw; 30. Steel ball; 31. Pressure sensor. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1:

[0036] Referring to Figures 1-10, this embodiment of the invention provides an ultra-precision machining equipment for automotive bearing rings, comprising:

[0037] Chassis 1;

[0038] The rotating mechanism 10 is installed inside the housing 1. The rotating mechanism 10 includes an internal gear ring 14 and a rotating bracket 13 installed on the outside of the internal gear ring 14. The rotating bracket 13 is rotatably connected inside the housing 1. The bottom of the internal gear ring 14 is fixedly connected to a drive motor 12 through a reducer. The drive motor 12 is installed inside the housing 1. Multiple clamping mechanisms 22 are provided on the inner side of the internal gear ring 14. Multiple through slots for the operation of the clamping mechanisms 22 are distributed circumferentially on the top wall of the housing 1.

[0039] Drive assembly 11 is located on the top of chassis 1. Drive assembly 11 includes X-axis drive mechanism 2, Y-axis drive mechanism 5, Z-axis drive mechanism 6 and fine grinding assembly 23. X-axis drive mechanism 2, Y-axis drive mechanism 5 and Z-axis drive mechanism 6 form a three-dimensional drive to drive fine grinding assembly 23 to fine grind the inner edge of automotive bearing ring.

[0040] The fine grinding assembly 23 includes a polygonal frame 8 and multiple L-shaped fine grinding supports 9 evenly distributed at the bottom of the polygonal frame 8. The multiple fine grinding supports 9 face the same direction, and their lower ends are all horizontally positioned. Each fine grinding support 9 has an oilstone 25 bolted to its lower end. A steel ball 30 is rotatably mounted on the lower end of one of the fine grinding supports 9. One side of the steel ball 30 abuts against a contact rod 24, and the other end of the contact rod 24 abuts against a pressure sensor 31. The contact rod 24 slides within the fine grinding support 9. The pressure sensor 31 is located within the fine grinding support 9. Through the coordinated operation of the X-axis drive mechanism 2, Y-axis drive mechanism 5, and Z-axis drive mechanism 6, the fine grinding support 9 with the oilstone 25 is brought close to the position on the automotive bearing ring that needs grinding. When one of the fine grinding supports 9 with the steel ball 30 is at the same position on the automotive bearing ring, the drive motor 12 drives the internal gear ring 14 to rotate via a reducer. As the internal gear ring 14 rotates within the housing 1 via the rotating support 13, it... Multiple gears 15 rotate synchronously in the same direction, driving the bearing platform 16 to rotate. The automotive bearing rings on the bearing platform 16 rotate synchronously. After the honing stone 25 grinds and reduces the corresponding part of the automotive bearing ring, the steel ball 30 contacts the corresponding position surface of the qualified automotive bearing ring and rotates, then presses the contact rod 24 to make the pressure sensor 31 display a value. After the pressure sensor 31 displays the contact value, the honing stone 25 is moved by the coordinated operation of the X-axis drive mechanism 2, Y-axis drive mechanism 5, and Z-axis drive mechanism 6 to grind other parts of the automotive bearing ring. The pressure sensor 31 is connected to the microcontroller and displays the data on the display. A constant value of the pressure sensor 31 can be set. When the value of the pressure sensor 31 reaches a certain level, the position of the honing stone 25 is changed to grind other raceway parts of the automotive bearing ring. When the honing stone 25 grinds the automotive bearing ring, grinding fluid needs to be supplied to facilitate cooling and lubrication, and improve the smoothness and structural density of the raceway of the automotive bearing ring.

[0041] The X-axis drive mechanism 2, Y-axis drive mechanism 5, and Z-axis drive mechanism 6 are all identical. Each of them includes a slide rail 27, a slide block 28, a ball screw 29, and a synchronous motor 26. The slide block 28 slides within the slide rail 27, and the ball screw 29 is connected to the slide block 28 via a nut pair. The ball screw 29 rotates within the slide rail 27, and one end of the ball screw 29 passes through the slide rail 27 and is connected to the synchronous motor 26 via a coupling. The identical configuration of these components ensures synchronous operation and high machining accuracy when driving the polygonal frame 8.

[0042] Each clamping mechanism 22 includes a base 16 and gears 15 mounted on the bottom of the base 16. The gears 15 are distributed in a circumferential manner and are all meshed inside the internal gear ring 14. The base 16 is rotatably mounted on the inner wall of the housing 1. The top of the base 16 has multiple mounting slots 21 in a circumferential shape. Multiple extension mechanisms 17 are set in the mounting slots 21. The base 16 is mounted in the housing 1 by a bracket. When the base 16 is working, it rotates independently. The drive motor 12 drives the internal gear ring 14 to rotate through a reducer. The internal gear ring 14 drives the meshing gears 15 to rotate. The gears 15 rotate through the base 16, so that the base 16 drives the automotive bearing ring to rotate and grind during processing.

[0043] The extension mechanism 17 includes support arms 18 evenly distributed on the side wall of the support platform 16. Each support arm 18 is hinged to an electric telescopic rod 19 at its top end. Each electric telescopic rod 19 is hinged to a rotating seat 20 at its drive end. Each rotating seat 20 is hinged in the mounting groove 21. The top of the support platform 16 is provided with a workstation and an automotive bearing ring is provided on the workstation. Multiple electric telescopic rods 19 on each clamping mechanism 22 move synchronously and are controlled by a microcontroller to achieve synchronous clamping of the automotive bearing ring, ensuring stable clamping force and preventing tilting. Corresponding mounting positions are provided on the support platform 16, which, combined with the extension mechanism 17, makes the automotive bearing ring more stable.

[0044] Two X-axis drive mechanisms 2 are symmetrically installed on the top of the chassis 1. Each X-axis drive mechanism 2 has a set of vertical rods 3 fixed on its slide 28. Each set of vertical rods 3 has a horizontally set crossbar 4 fixed at its top. Both ends of each crossbar 4 are connected to the Y-axis drive mechanism 5. Each Y-axis drive mechanism 5 has a slide 28 connected to the slide rail 27 of the Z-axis drive mechanism 6. Each Z-axis drive mechanism 6 has a connecting rod 7 fixed on its slide 28. The side of the connecting rod 7 that is close to each other is fixed to the polygonal frame 8. By cooperating with the X-axis drive mechanism 2, Y-axis drive mechanism 5, and Z-axis drive mechanism 6, the polygonal frame 8 is driven synchronously, so that the processed products will have stable and uniform quality.

[0045] The polygonal frame 8 is centrally symmetrically arranged. The number of fine grinding supports 9 and clamping mechanisms 22 is the same. Each fine grinding support 9 is positioned directly above the clamping mechanism 22, which facilitates the fine grinding support 9 to perform fine grinding on the bearing ring through the oilstone 25. When the oilstone 25 performs fine grinding on the bearing ring, it is operated in coordination by the X-axis drive mechanism 2, Y-axis drive mechanism 5, and Z-axis drive mechanism 6 to make it swing within a small range, thereby improving grinding efficiency. The X-axis drive mechanism 2, Y-axis drive mechanism 5, and Z-axis drive mechanism 6 operate in coordination, and a microcontroller is used to make them operate synchronously to prevent motion interference.

[0046] Example 2:

[0047] Reference Figures 1-10As shown in the figure, this embodiment of the invention provides a method for ultra-precision machining of automotive bearing rings. The equipment used for ultra-precision machining of automotive bearing rings is the ultra-precision machining equipment for automotive bearing rings described above, and includes the following steps:

[0048] Step S1, Installation: Select a car bearing ring to be processed and process it into a qualified product on the bearing ultra-precision machine. Set the qualified product as a processing sample on the platform 16 of the clamping mechanism 22 directly below the precision grinding bracket 9 with steel balls 30. Then, place the car bearing rings to be ultra-precision processed on several other platforms 16. The electric telescopic rod 19 in the extension mechanism 17 extends with the support arm 18 to make the rotating seat 20 on each clamping mechanism 22 move synchronously to clamp and fix the car bearing rings on the corresponding platforms 16. After installation, the center lines of each car bearing ring and platform 16 are on the same straight line. Using one car bearing ring as a processing sample, the other stations use the blanks of car bearing rings. One template is used for multiple blanks as a blueprint, so that the bearing ring processing can be carried out with the same parameters as the template, ensuring the stability of the processing quality.

[0049] Step S2, Processing: The X-axis drive mechanism 2, Y-axis drive mechanism 5, and Z-axis drive mechanism 6 work together to bring the precision grinding bracket 9 with oilstone 25 close to the position of the automotive bearing ring that needs to be ground. When one of the precision grinding brackets 9 with steel balls 30 is at the same position on the automotive bearing ring, the drive motor 12 drives the internal gear ring 14 to rotate through the reducer. When the internal gear ring 14 rotates in the machine housing 1 through the rotating bracket 13, it causes multiple gears 15 to rotate synchronously in the same direction. The gears 15 drive the bearing platform 16 to rotate, and the automotive bearing ring on the bearing platform 16 rotates synchronously.

[0050] Step S3, Movement: After the oilstone 25 grinds and reduces the corresponding part of the car bearing ring, the steel ball 30 contacts the corresponding position surface of the qualified car bearing ring and rotates, then presses the contact rod 24 to make the pressure sensor 31 display a value. After the pressure sensor 31 displays the contact value, the oilstone 25 is moved by the coordinated operation of the X-axis drive mechanism 2, Y-axis drive mechanism 5, and Z-axis drive mechanism 6 to grind other parts of the car bearing ring.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ultra-precision machining equipment for automotive bearing rings, characterized in that: Include: Case (1); Rotary mechanism (10), the rotary mechanism (10) is installed in the case (1), the rotary mechanism (10) includes an inner ring gear (14) and a rotating support (13) installed on the outer side of the inner ring gear (14), the rotating support (13) is rotatably connected in the case (1), the bottom of the inner ring gear (14) is fixedly connected with a driving motor (12) through a speed reducer, the driving motor (12) is installed in the case (1), a plurality of clamping mechanisms (22) are arranged on the inner side of the inner ring gear (14), a plurality of through slots for the working of the clamping mechanisms (22) are arranged on the top wall of the case (1) in a circumferential manner; Drive assembly (11), the drive assembly (11) is arranged on the top of the case (1), the drive assembly (11) includes an X-axis drive mechanism (2), a Y-axis drive mechanism (5), a Z-axis drive mechanism (6) and a fine grinding assembly (23), the X-axis drive mechanism (2), the Y-axis drive mechanism (5), the Z-axis drive mechanism (6) and the fine grinding assembly (23) form a three-dimensional drive mechanism, and the fine grinding assembly (23) is arranged on the top of the case (1); The fine grinding assembly (23) includes a polygonal frame (8) and a plurality of L-shaped fine grinding supports (9) uniformly distributed on the bottom of the polygonal frame (8), the plurality of fine grinding supports (9) are arranged in the same direction, the lower ends of the plurality of fine grinding supports (9) are horizontally arranged, the lower ends of the plurality of fine grinding supports (9) are provided with oil stones (25) through bolts, one end of the steel ball (30) is rotatably arranged on the lower end of one of the fine grinding supports (9), one side of the steel ball (30) abuts against a contact rod (24), the other end of the contact rod (24) abuts against a pressure sensor (31), the contact rod (24) slides in the fine grinding support (9), and the pressure sensor (31) is arranged in the fine grinding support (9); Each clamping mechanism (22) includes a bearing platform (16) and a gear (15) mounted on the bottom of the bearing platform (16), the gears (15) are arranged in a circumferential manner and are engaged with the inner side of the inner ring gear (14), the bearing platforms (16) are rotatably mounted on the inner wall of the case (1), a plurality of mounting grooves (21) are arranged on the top of the bearing platform (16) in a circumferential manner, and a plurality of stretching mechanisms (17) are arranged in the mounting grooves (21); The stretching mechanism (17) includes support arms (18) uniformly distributed on the side wall of the bearing platform (16), the top ends of the support arms (18) are hingedly connected with electric telescopic rods (19), the driving ends of the electric telescopic rods (19) are hingedly connected with rotating seats (20), the rotating seats (20) are hingedly connected in the mounting grooves (21), and the top of the bearing platform (16) is provided with a work station and the work station is provided with an automobile bearing ring.

2. The superfinishing apparatus for an automotive bearing race as defined in claim 1 wherein: The X-axis driving mechanism (2), Y-axis driving mechanism (5) and Z-axis driving mechanism (6) are all same, the X-axis driving mechanism (2), Y-axis driving mechanism (5) and Z-axis driving mechanism (6) all include slide rail (27), sliding seat (28), ball screw (29) and synchronous motor (26), the sliding seat (28) slides in the slide rail (27), the ball screw (29) is connected through the nut pair and the sliding seat (28), the ball screw (29) rotates in the slide rail (27), one end of the ball screw (29) penetrates the slide rail (27) and is connected through the shaft coupling and the synchronous motor (26).

3. The apparatus for superfinishing of an automotive bearing race as defined in claim 2 wherein: The X-axis driving mechanism (2) has two and is symmetrically installed at the top of the cabinet (1), a group of vertical rods (3) are fixed on the sliding seat (28) of each X-axis driving mechanism (2), the top of each group of vertical rods (3) is fixed with horizontally arranged cross bars (4), the two ends of each cross bar (4) are connected with Y-axis driving mechanism (5), the sliding seat (28) of each Y-axis driving mechanism (5) is connected with the slide rail (27) of Z-axis driving mechanism (6), the sliding seat (28) of Z-axis driving mechanism (6) is fixed with connecting rods (7), and the sides close to each other of the connecting rods (7) are fixed with polygonal frames (8).

4. The apparatus for superfinishing of an automotive bearing race as defined in claim 1 wherein: The polygonal frames (8) are centrally symmetric, the number of fine grinding supports (9) and clamping mechanisms (22) is same, and the fine grinding supports (9) are one-to-one correspondingly arranged above the clamping mechanisms (22).

5. A method for superfinishing an automotive bearing raceway, wherein the superfinishing apparatus is the superfinishing apparatus of any one of claims 1-4, and wherein the method comprises: rotating the workpiece at a rotational speed of 100-1000 rpm; and moving the workpiece along the longitudinal axis of the workpiece at a linear speed of 0.1-10 m / s. The method comprises the following steps: Step S1, installation: select an automobile bearing ring to be processed on the bearing superfinishing machine to process into a qualified product, and set the qualified product as a processing sample below the fine grinding support (9) with a steel ball (30) on the bearing superfinishing machine, then place the automobile bearing rings to be superfinished on the other several bearing platforms (16), and the motorized telescopic rods (19) in the stretching mechanism (17) are stretched to make the rotating seats (20) on each clamping mechanism (22) move synchronously to clamp and fix the automobile bearing rings on the corresponding bearing platforms (16), so that the center lines of each automobile bearing ring and the bearing platform (16) are on the same straight line after installation; Step S2, processing: through the cooperation of the X-axis driving mechanism (2), Y-axis driving mechanism (5) and Z-axis driving mechanism (6), the fine grinding support (9) with an oil stone (25) is close to the position of the automobile bearing ring to be polished, one of the fine grinding supports (9) with a steel ball (30) is at the same position of the automobile bearing ring, the driving motor (12) drives the inner gear ring (14) to rotate through the speed reducer, the inner gear ring (14) drives the plurality of gears (15) to rotate synchronously and in the same direction through the rotating support (13) when rotating in the cabinet (1), the gears (15) drive the bearing platform (16) to rotate, and the automobile bearing rings on the bearing platform (16) rotate synchronously. Step S3, moving: after the oil stone (25) grinds and reduces the corresponding automobile bearing ring part, the steel ball (30) contacts the corresponding position of the qualified automobile bearing ring and rotates, then extrudes the contact rod (24) to make the pressure sensor (31) display the value, after the pressure sensor (31) displays the contact value, the X-axis driving mechanism (2), the Y-axis driving mechanism (5) and the Z-axis driving mechanism (6) cooperate to move the oil stone (25) and then grind other parts of the automobile bearing ring.

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