A bearing retainer roundness shaping and stress relief device

Abstract

This application discloses a bearing cage roundness shaping and stress relief device, including a limiting wheel for limiting the product, a driving wheel for driving the product to rotate, and a pressing wheel for adjusting the roundness of the product opening. The cage is placed between the pressing wheel, the driving wheel, and the limiting wheel, and the outer wall of the cage contacts the pressing wheel, the driving wheel, and the limiting wheel. Through the synergistic effect of the driving wheel's rotation, the dynamic pressure of the pressing wheel, and the positioning assistance of the limiting wheel, the roundness correction and stress release of the cage are achieved in two stages. In the first stage, elliptic pretreatment is performed, in which the cage forms a controllable elliptical deformation through the rotation of the driving wheel and the pressure of the pressing wheel, promoting the internal stress transfer and redistribution. In the second stage, rounding and shaping is performed, in which each wheel is adjusted to the standard size position. After stress release, by precisely controlling the position and rotation time of each wheel, the cage undergoes controllable permanent plastic deformation, ensuring that the roundness meets the standard and the stability is improved.

Description

Technical Field

[0001] This application belongs to the field of bearing cages, and particularly relates to a bearing cage roundness shaping and stress relief device. Background Technology

[0002] In the bearing manufacturing industry, the bearing cage is a core component, and its geometric accuracy has a decisive impact on the overall performance and operational stability of the bearing. Roundness, as a key indicator of cage quality, directly affects the bearing's rotational accuracy, vibration amplitude, and service life. Taking finished tapered cages (product diameter 1.5-3mm) as an example, their roundness requirements are extremely stringent, typically specified to be ≤1.0mm. However, in actual production, due to the inherent limitations of the processing technology, the inherent characteristics of the materials, and the stress release during processing, the roundness of currently produced tapered cages generally exceeds the standard, with actual measurements mostly concentrated in the 1.5-3.0mm range. Excessive roundness will cause uneven stress on the bearing during operation, leading to increased vibration, noise, and severe overheating, seriously affecting bearing performance and reliability, and even causing premature bearing failure, posing a hidden danger to the safe operation of equipment. To solve the problem of excessive roundness in tapered cages, improve product quality, and ensure the normal operation of bearings, it is necessary to use tooling to correct the out-of-tolerance cages to bring their roundness to the qualified standard. Because the difference between the out-of-tolerance cage and the standard roundness is small, the correction amount is very minute, resulting in a relatively small force applied to the cage. This weak force can only make minor adjustments to a local area of ​​the cage and cannot generate enough force to drive a large-scale redistribution of internal stress in the material. Although this minor shaping operation changes the local shape of the cage, temporarily restoring its roundness to the standard, it does not provide sufficient force and space for the internal stress of the material to redistribute and reach a new equilibrium. This leads to poor stability after shaping. Therefore, designing a new tooling that can effectively solve the stress problem and improve the stability after correction is urgently needed. It is evident that the existing technology needs further improvement. Utility Model Content

[0003] This invention provides a bearing cage roundness shaping and stress relief device to solve the problem that although cage roundness adjustment can make local fine adjustments, it cannot solve the problem of residual internal stress in the material, resulting in a high roundness rebound rate and poor stability after correction.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A bearing cage roundness shaping and stress relief device includes a limiting wheel for limiting the product, a driving wheel that can drive the product to rotate, and a pressing wheel that can adjust the roundness of the product opening.

[0006] The retainer is positioned between the extrusion wheel, the drive wheel, and the limit wheel, and the outer wall of the retainer is in contact with the extrusion wheel, the drive wheel, and the limit wheel.

[0007] The drive wheel rotates while the extrusion wheel moves a designed distance toward the center of the product, causing the cage to become elliptical. The elliptical product is rotated for a certain period of time to redistribute the internal stress of the cage and cause permanent plastic deformation to change the roundness of the cage. Then, the extrusion wheel, drive wheel, and limit wheel are adjusted to the standard outer circle size position, and the rotation and rolling continue for the designed time to cause permanent plastic deformation of the cage and to achieve the qualified roundness of the cage.

[0008] The aforementioned structure, through the synergistic effect of the drive wheel's rotation, the dynamic pressure of the extrusion wheel, and the assisted positioning of the limiting wheel, achieves cage roundness correction and stress release in two stages. The first stage, elliptic pretreatment, involves moving the extrusion wheel a designed distance towards the center, causing the cage to undergo controllable elliptical deformation, simulating the material creep process and promoting internal stress migration and redistribution. The second stage, rounding and shaping, involves adjusting each wheel to its standard dimensional position. After stress release, precise control of the wheel positions and rotation time causes controllable permanent plastic deformation of the cage, ensuring roundness meets standards and improving stability.

[0009] In a preferred embodiment, at least one extrusion wheel is provided, and at least two drive wheels and two limit wheels are provided. The drive wheels are arranged symmetrically with respect to the direction of movement of the extrusion wheel, and the limit wheels are also arranged symmetrically with respect to the direction of movement of the extrusion wheel. Furthermore, the distance between the drive wheels arranged in opposite directions and the distance between the limit wheels arranged in opposite directions are both less than the diameter of the cage.

[0010] The two drive wheels are symmetrically distributed in the direction of extrusion wheel movement, ensuring uniform force on the cage during rotational drive and avoiding torque deviation or localized stress concentration caused by unilateral drive. The symmetrically distributed limit wheels provide stable radial support, preventing asymmetrical deformation of the cage due to insufficient unilateral constraint during the elliptic pretreatment stage. The symmetrically arranged drive wheels and limit wheels work together to ensure uniform compression of the cage along the extrusion direction when the extrusion wheel applies pressure, forming a regular elliptic deformation.

[0011] In a preferred embodiment, an active height limiting wheel is also included, which abuts against the upper surface of the cage; during the process of the compression wheel compressing the cage to adjust its roundness deformation, the active height limiting wheel can limit the cage in the height direction to prevent the cage from displacing in the height direction.

[0012] The active height limiting wheel directly restricts axial displacement through rigid contact, ensuring that deformation is strictly controlled within the radial plane and avoiding three-dimensional deformation during the "ellipticization" or "rounding" process.

[0013] In a preferred embodiment, the active height limiting wheel is rotatably mounted on a base, and the active height limiting wheel has a first position and a second position. When the active height limiting wheel is in the first position, its axial direction is parallel to the axial direction of the retainer, so as to facilitate placing the retainer in the corresponding position in the device. When the active height limiting wheel is in the second position, its axial direction is perpendicular to the axial direction of the retainer, so as to press the upper edge of the retainer and realize the limiting of the retainer in the height direction.

[0014] In a preferred embodiment, a bottom flat reference wheel is also included, which abuts against the lower surface of the cage to ensure smooth rotation of the cage.

[0015] In a preferred embodiment, the outer contour shapes of the extrusion wheel, the drive wheel, and the limit wheel are adapted to the outer wall shape of the cage.

[0016] A matching outer profile ensures that the direction of force transmission is consistent with the deformation requirements of the cage, avoiding deformation deviations caused by mismatched profiles.

[0017] In a preferred embodiment, the extrusion wheel, the drive wheel, and the limiting wheel are all movably disposed on the adjustment base; the adjustment base is provided with a moving groove, which includes an extrusion wheel moving groove, a drive wheel moving groove, and a limiting wheel moving groove, respectively movably displacing the extrusion wheel, the drive wheel, and the limiting wheel; wherein, the extending direction of the extrusion wheel moving groove is perpendicular to the extending direction of the drive wheel moving groove and the extending direction of the limiting wheel moving groove.

[0018] In a preferred embodiment, a ball screw transmission mechanism is provided in the moving groove, and the ball screw transmission mechanism cooperates with a servo motor; the bases of the extrusion wheel, the limit wheel and the drive wheel are all connected to the moving part of the ball screw in the ball screw transmission mechanism, and the bases can move along the moving groove under the rotation of the screw.

[0019] By combining a ball screw transmission mechanism with a servo motor, the servo motor is electrically connected to the controller to achieve intelligent control of the movement distance. Combined with the vertical layout of the moving slot design, high-precision, high-dynamic, and high-stability movement control of the extrusion wheel, drive wheel, and limit wheel is achieved.

[0020] In a preferred embodiment, the drive wheel includes a shaft, a wheel body sleeved outside the shaft, the shaft being rotatably mounted on a base, the shaft having a first tooth, a rotating motor being provided in the moving part, the output rod of the rotating motor having a second tooth, and the first tooth and the second tooth meshing with each other.

[0021] In a preferred implementation, the extrusion wheel, the drive wheel, and the limit wheel are on the same height plane. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain this application and do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1 The illustration shows a schematic embodiment of the first stage of this application where the extrusion wheel extrudes and rolls the retainer into an ellipse.

[0024] Figure 2 This illustration shows a schematic implementation of the second stage of this application, in which the extrusion wheel and the limiting wheel are rolled to make the cage a standard circle.

[0025] Figure 3 A schematic diagram illustrating one embodiment of the bearing cage roundness shaping and stress relief device of this application is shown.

[0026] Figure 4 A schematic diagram illustrating one embodiment of the ball screw transmission mechanism and its cooperation with the drive wheel of this application is shown.

[0027] Figure 5 A schematic three-dimensional structural diagram of one embodiment of the active height limiting wheel of this application is shown;

[0028] Label Explanation:

[0029] 1. Extrusion roller; 2. Drive roller; 20. Shaft; 21. Wheel body; 22. First tooth; 23. Rotating motor; 230. Second tooth; 24. Base; 3. Limiting roller; 4. Drive height limiting roller; 40. Base; 41. Fixed rod; 42. Rotating rod; 43. Fixed part; 5. Bottom flat reference roller; 6. Adjusting base; 60. Extrusion roller moving groove; 61. Drive roller moving groove; 62. Limiting roller moving groove; 7. Ball screw transmission mechanism; 70. Servo motor; 71. Screw; 72. Moving part. Detailed Implementation

[0030] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0031] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In this utility model, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] In this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0034] The present invention will now be described with reference to the accompanying drawings.

[0035] The specific solution adopted is as follows:

[0036] like Figure 1-5 As shown, this utility model provides a bearing cage roundness shaping and stress relief device, including a limiting wheel for limiting the product, a driving wheel 2 that can drive the product to rotate, and a pressing wheel 1 that can adjust the roundness of the product opening.

[0037] The retainer is positioned between the extrusion wheel 1, the drive wheel 2, and the limiting wheel 3, and the outer wall of the retainer is in contact with the extrusion wheel 1, the drive wheel 2, and the limiting wheel 3;

[0038] The drive wheel 2 rotates while the extrusion wheel 1 moves a designed distance toward the center of the product, causing the cage to become elliptical. The elliptical product is rotated for a certain period of time to redistribute the internal stress of the cage and cause permanent plastic deformation to change the roundness of the cage. Then, the extrusion wheel 1, drive wheel 2, and limit wheel 3 are adjusted to the standard outer circle size position and the rotation and rolling continue for the designed time to cause permanent plastic deformation of the cage and to achieve the qualified roundness of the cage.

[0039] By employing the bearing cage roundness shaping and stress relief device of this application, the roundness correction and stress release of the cage are achieved in two stages through the synergistic effect of the driving wheel 2 driving rotation, the dynamic pressure of the extrusion wheel 1, and the auxiliary positioning of the limiting wheel 3. In the first stage, elliptic pretreatment, the extrusion wheel 1 moves a designed distance towards the center of the circle, causing the cage to form a controllable elliptical deformation. Rotation for a certain period of time promotes the redistribution of internal stress. In the second stage, rounding and shaping, each wheel is adjusted to the standard size position, and rotation continues to cause permanent plastic deformation of the cage, ultimately achieving qualified roundness.

[0040] In the ellipticization pretreatment stage, the cage undergoes controllable elliptical deformation through the rotation of the driving wheel 2 and the pressure applied by the extrusion wheel 1, simulating the material creep process and promoting internal stress migration and redistribution. Compared to traditional local fine-tuning, this method triggers stress release through overall deformation, fundamentally solving the problem of false conformity. In the rounding and shaping stage, after stress release, the cage undergoes controllable permanent plastic deformation by precisely controlling the position and rotation time of each wheel, ensuring that roundness meets the standard and stability is improved.

[0041] By combining ellipticization pretreatment with rounding and shaping in stages, an integrated solution for cage roundness correction and stress release is achieved, significantly improving correction accuracy, stability, and production efficiency. Compared to traditional technologies, its core advantages lie in thorough stress release, high roundness retention, and efficient single-station processing, making it highly valuable for industrial applications.

[0042] See Figure 1 and Figure 2 At least one extrusion wheel 1 is provided, and at least two drive wheels 2 and two limit wheels 3 are provided. The drive wheels 2 are arranged symmetrically with respect to the movement direction of the extrusion wheel 1, and the limit wheels 3 are also arranged symmetrically with respect to the movement direction of the extrusion wheel 1. Furthermore, the distance between the drive wheels 2 arranged in opposite directions and the distance between the limit wheels 3 arranged in opposite directions, including the distance between the drive wheels 2 and the limit wheels 3, are all less than the diameter of the cage.

[0043] The two drive wheels 2 are symmetrically distributed in the direction of movement of the extrusion wheel 1, ensuring that the cage is subjected to uniform force during rotational drive and avoiding torque deviation or local stress concentration caused by unilateral drive. The symmetrically distributed limit wheels 3 provide stable radial support, preventing the cage from undergoing asymmetrical deformation due to insufficient unilateral constraint during the elliptic pretreatment stage. The symmetrically arranged drive wheels 2 and limit wheels 3 work together to ensure that the cage is uniformly compressed along the extrusion direction when the extrusion wheel 1 applies pressure, forming a regular elliptic deformation.

[0044] During the ellipticization pretreatment stage, the cage needs to undergo controllable elliptical deformation (increased distance between two points along the major axis) under the action of the extrusion wheel 1. If the distance between the driving wheel 2 or the limiting wheel 3 is greater than or equal to the cage diameter, when deformation occurs, the wheel body 21 may directly contact the vertex of the ellipse's major axis, forming a rigid support that hinders deformation expansion and leads to insufficient stress release. When the distance is less than the diameter, the wheel body 21 only contacts the outer wall of the cage on the initial circumference. During deformation, the wheel body can dynamically adjust its contact position with the outer wall of the cage to maintain contact and guide stress distribution. The distance design ensures that elliptic deformation occurs only in the extrusion direction, rather than random deformation in the radial or axial direction, providing a stable basis for subsequent stress release. The symmetrical structure allows the internal stress of the cage to migrate uniformly during ellipticization rotation, avoiding deformation rebound or material damage caused by local stress concentration.

[0045] See Figure 4 and Figure 5 It also includes an active height limiting wheel 4, which abuts against the upper surface of the cage; during the process of the compression wheel 1 compressing the cage to adjust its roundness deformation, the active height limiting wheel 4 can limit the cage in the height direction, preventing the cage from displacing in the height direction.

[0046] When the extrusion roller 1 applies radial pressure, the cage may warp or shift in the height direction (axial direction) due to material elasticity or uneven stress distribution. The active height limiting roller 4 directly restricts axial displacement through rigid contact, ensuring that deformation is strictly controlled within the radial plane and avoiding three-dimensional deformation during the "ellipticization" or "rounding" process. By contacting the upper surface of the cage, the active height limiting roller 4 restricts the deformation displacement in the height direction when the extrusion roller 1 corrects the roundness of the cage, ensuring that deformation only occurs within the expected radial (circumferential) plane.

[0047] For details, see Figure 5The active height limiting wheel 4 is rotatably sleeved on the fixed rod 41. The fixed rod 41 is vertically connected to a rotating rod 42, which is rotatably mounted on the base 40. The active height limiting wheel 4 has a first position and a second position. When the active height limiting wheel 4 is in the first position, its axis is parallel to the axis of the retainer, so as to place the retainer in the corresponding position in the device. When the active height limiting wheel 4 is in the second position, its axis is perpendicular to the axis of the retainer, so as to press the upper edge of the retainer and limit the height of the retainer. In order to achieve the stability of the active height limiting wheel 4 in the first and second positions, the rotating rod 42 is provided with a fixing hole. A fixing part 43 parallel to the rotating rod 42 is provided on the lower side of the base 40. The fixing part is provided with a positioning hole. When the rotating rod 42 rotates to the designed position, that is, when the active height limiting wheel 4 is in the first or second position, the fixing hole and the positioning hole are vertically aligned, and a pin is inserted for limiting.

[0048] As a preferred embodiment of this application, see [link to application]. Figure 3 It also includes a bottom flat reference wheel 5, which abuts against the lower surface of the cage to ensure that the cage rotates smoothly.

[0049] As a preferred embodiment of this application, the outer contour shapes of the compression wheel 1, the drive wheel 2, and the limiting wheel 3 are adapted to the outer wall shape of the cage. For example, for a cylindrical cage, each contact wheel is cylindrical, and for a conical cage, each contact wheel is frustum-shaped. The adapted outer contours can ensure that the direction of force transmission is consistent with the deformation requirements of the cage, and avoid deformation deviation caused by mismatch of contours.

[0050] See Figure 3 The extrusion wheel 1, the drive wheel 2, and the limiting wheel 3 are all movably mounted on the adjustment base 6. The adjustment base 6 is provided with a moving groove, which includes an extrusion wheel moving groove 60, a drive wheel moving groove 61, and a limiting wheel moving groove 62, which respectively movably mount the extrusion wheel 1, the drive wheel 2, and the limiting wheel 3. The extending direction of the extrusion wheel moving groove 60 is perpendicular to the extending direction of the drive wheel moving groove 61 and the extending direction of the limiting wheel moving groove 62.

[0051] A ball screw transmission mechanism 7 is provided in the moving groove, and the ball screw transmission mechanism 7 cooperates with the servo motor 70; the base 24 of the extrusion wheel 1, the limit wheel 3 and the drive wheel 2 are all connected to the moving part 72 provided in the ball screw 71 of the ball screw transmission mechanism 7, and the base 24 can move along the moving groove under the rotation of the screw 71.

[0052] The combination of ball screw transmission mechanism 7 and servo motor 70, with servo motor 70 electrically connected to the controller, enables intelligent control of the movement distance. Combined with the vertically arranged moving slot design, this achieves high-precision, high-dynamic, and high-stability movement control of the extrusion wheel 1, drive wheel 2, and limit wheel 3. This meets the micron-level precision requirements for cage roundness correction, ensures process consistency, supports real-time adjustment and multi-condition coordination, and improves production efficiency and flexibility.

[0053] See Figure 4 The drive wheel 2 includes a shaft 20, a wheel body 21 sleeved on the shaft 20, the shaft 20 is rotatably mounted on the base 24, the shaft 20 is provided with a first tooth 22, a rotating motor 23 is provided in the moving part 72, the output rod of the rotating motor 23 is provided with a second tooth 230, and the first tooth 22 and the second tooth 230 mesh with each other.

[0054] In a preferred embodiment of this application, the extrusion wheel 1, the drive wheel 2, and the limit wheel 3 are located on the same height plane.

[0055] If the wheel bodies 21 are not on the same height plane, the cage may experience uneven local stress during rotation due to the difference in contact height between the wheel bodies 21 (e.g., one side is under excessive stress while the other side is suspended), leading to unexpected deformation or vibration. A single height plane ensures that all contact points between the wheel bodies 21 and the cage are on the same horizontal plane, achieving equal-height contact and ensuring uniform load distribution.

[0056] Select product model TSSF-8224 for verification (product parameters: material: S355MC, product diameter: 2163, product angle: 18°54′, product thickness: 13, product sub-height: 174).

[0057] The processing steps (taking 8224 as an example) are as follows: by adjusting the extrusion roller 1 to move 20-30mm toward the center, the product becomes elliptical (D1 < D3 < D2). Rotating for 10 minutes redistributes the stress and causes permanent plastic deformation to change the roundness of the product.

[0058] Finally, adjust all the contacting wheels to the "standard outer circle D3 dimension position of product 8224", rotate for 10 minutes to allow the product to undergo permanent plastic deformation and achieve the required roundness.

[0059] In summary, the stress is redistributed evenly, and the ratio of the moving distance (20-30mm) to the cage diameter (1.5m-2.8m, i.e., 1500-3000mm) reflects a relatively low degree of deformation. Due to the small relative deformation, although the product becomes elliptical (D1 < D3 < D2) after the extrusion roller is moved towards the center, this deformation does not cause the product to lose its basic rotational ability. The small relative deformation does not destroy the overall structural stability of the product; only the local shape is changed.

[0060] As the extrusion rollers move towards the center, the product is compressed, altering its internal stress state. Due to the relatively small movement distance, the stress redistribution process is relatively gentle. During the 10-minute rotation, the stress gradually becomes more evenly distributed, while the product undergoes permanent plastic deformation to change its roundness. The small movement distance prevents excessive stress concentration, avoiding cracking or excessive deformation of the product due to excessive localized stress.

[0061] Under the influence of stress redistribution and permanent plastic deformation, the roundness of the product is improved to a certain extent. Although the initial deformation worsens the roundness, through subsequent adjustments and rotation, the product gradually approaches the standard roundness. The ratio of the movement distance to the cage diameter determines the stress distribution and the degree of deformation. A smaller movement distance makes the deformation process controllable, which is beneficial for ultimately achieving qualified roundness.

[0062] This design is suitable for cages with a certain strength and toughness, capable of withstanding small relative deformations without damage.

[0063] For example, for products with a material strength of 520MPa, a diameter of 1.5m-3m, and a thickness of 8-20mm and 100-250mm, the cage can maintain stable dimensions, and the roundness of the cage will remain qualified during transportation, storage, assembly, and service.

[0064] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0065] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A bearing cage roundness shaping and stress relief device, characterized in that, It includes a limiting wheel for limiting the product, a drive wheel that can drive the product to rotate, and an extrusion wheel that can adjust the roundness of the product opening; The retainer is positioned between the extrusion wheel, the drive wheel, and the limit wheel, and the outer wall of the retainer is in contact with the extrusion wheel, the drive wheel, and the limit wheel. The drive wheel rotates while the extrusion wheel moves a designed distance toward the center of the product, causing the cage to become elliptical. The elliptical product is rotated for a certain period of time to redistribute the internal stress of the cage and cause permanent plastic deformation to change the roundness of the cage. Then, the extrusion wheel, drive wheel, and limit wheel are adjusted to the standard outer circle size position, and the rotation and rolling continue for the designed time to cause permanent plastic deformation of the cage and to achieve the qualified roundness of the cage.

2. The bearing cage roundness shaping and stress relief device according to claim 1, characterized in that, At least one extrusion wheel is provided, and at least two drive wheels and two limit wheels are provided. The drive wheels are arranged symmetrically with respect to the direction of movement of the extrusion wheel, and the limit wheels are also arranged symmetrically with respect to the direction of movement of the extrusion wheel. Furthermore, the distance between the drive wheels arranged opposite each other and the distance between the limit wheels arranged opposite each other are both less than the diameter of the cage.

3. The bearing cage roundness shaping and stress relief device according to claim 1, characterized in that, It also includes an active height limiting wheel, which abuts against the upper surface of the cage; during the process of the compression wheel compressing the cage to adjust its roundness deformation, the active height limiting wheel can limit the cage in the height direction to prevent the cage from displacing in the height direction.

4. The bearing cage roundness shaping and stress relief device according to claim 3, characterized in that, The active height limiting wheel is rotatably mounted on a base and has a first position and a second position. When the active height limiting wheel is in the first position, its axis is parallel to the axis of the retainer, so as to place the retainer in the corresponding position in the device. When the active height limiting wheel is in the second position, its axis is perpendicular to the axis of the retainer, so as to press the upper edge of the retainer and limit the height of the retainer.

5. The bearing cage roundness shaping and stress relief device according to claim 1, characterized in that, It also includes a bottom flat reference wheel, which abuts against the lower surface of the cage to ensure smooth rotation of the cage.

6. The bearing cage roundness shaping and stress relief device according to claim 1, characterized in that, The outer contours of the extrusion wheel, drive wheel, and limit wheel are adapted to the outer wall shape of the cage.

7. The bearing cage roundness shaping and stress relief device according to claim 2, characterized in that, The extrusion wheel, drive wheel, and limit wheel are all movably mounted on the adjustment base. The adjustment base has a moving groove, which includes an extrusion wheel moving groove, a drive wheel moving groove, and a limit wheel moving groove, respectively movably mounting the extrusion wheel, drive wheel, and limit wheel. The extending direction of the extrusion wheel moving groove is perpendicular to the extending direction of the drive wheel moving groove and the extending direction of the limit wheel moving groove.

8. The bearing cage roundness shaping and stress relief device according to claim 7, characterized in that, A ball screw transmission mechanism is provided in the moving groove, and the ball screw transmission mechanism cooperates with the servo motor; the bases of the extrusion wheel, the limit wheel and the drive wheel are all connected to the moving part of the ball screw in the ball screw transmission mechanism, and the base can move along the moving groove under the rotation of the screw.

9. The bearing cage roundness shaping and stress relief device according to claim 8, characterized in that, The drive wheel includes a shaft, a wheel body sleeved outside the shaft, the shaft is rotatably mounted on the base, the shaft has a first tooth, a rotating motor is provided in the moving part, the output rod of the rotating motor has a second tooth, and the first tooth and the second tooth mesh with each other.

10. The bearing cage roundness shaping and stress relief device according to claim 1, characterized in that, The extrusion wheel, drive wheel, and limit wheel are on the same height plane.

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