Ceramic spherical roller machining method

Abstract

According to the ceramic spherical roller machining method, through step-by-step pretreatment of circumferential surface rough grinding, double-end-face rough grinding / accurate grinding, circumferential surface accurate grinding and rough grinding chamfering of the roller blank, a high-precision reference blank is provided for subsequent spherical grinding, the shape correction amount during spherical grinding is greatly reduced, and the grinding tool loss and the machining time are reduced. Meanwhile, in cooperation with six-face limiting during spherical surface grinding, the clamping driving device is matched with the grinding wheel device to stably clamp the roller blank and drive the roller blank to rotate, it is guaranteed that the grinding track of the grinding wheel device on the spherical surface is uniform and consistent, then the size consistency and surface quality of the ceramic spherical roller are improved, and the yield of finished products and production efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of bearing rolling element processing technology, and in particular to a method for processing ceramic spherical rollers. Background Technology

[0002] In modern industry, self-aligning roller bearings, with their excellent load-carrying capacity and self-aligning ability, have become key basic components of high-end equipment such as wind turbine generators, aerospace engines, and marine propulsion systems. However, the service environments of these devices are often extremely harsh, requiring bearings to withstand challenges such as high temperature differences, high humidity, media contamination, corrosion, and insufficient lubrication over long periods. Traditional steel rolling elements are prone to accelerated wear, surface fatigue, and even failure under these conditions, severely limiting the reliability and service life of the entire bearing system.

[0003] Ceramic materials, especially silicon nitride (Si3N4), are considered ideal for manufacturing rolling elements of high-performance bearings due to their excellent properties such as high temperature resistance, wear resistance, corrosion resistance, oil-free self-lubrication, lightweight, and electrical insulation. However, applying ceramic materials to the manufacture of complex-shaped spherical rollers faces significant technological challenges. A common approach is to initially form the drum-shaped spherical outer diameter during the ceramic powder pressing and molding (green) stage. However, silicon nitride ceramics require high-temperature sintering above 1700℃ to achieve densification, during which significant (approximately 20%) and anisotropic volume shrinkage occurs. This nonlinear shrinkage is extremely difficult to predict and control precisely, leading to severe distortion and dimensional deviations in the spherical profile during the green stage. The sintered blank's spherical profile, dimensional consistency, and surface quality fail to meet the precision requirements of high-performance bearings, necessitating extensive subsequent grinding to correct the shape, ultimately resulting in low production efficiency.

[0004] Therefore, there is an urgent need for a high-efficiency method for machining ceramic spherical rollers. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for processing ceramic spherical rollers, which solves the technical problem of low processing efficiency of ceramic spherical rollers.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] This invention provides a method for processing ceramic spherical rollers, comprising the following steps;

[0010] S1. After vacuum dewaxing, the pressed silicon nitride cylindrical blank is sintered by hot isostatic pressing to obtain the roller blank.

[0011] S2. Roughly grind the circumferential surface of the roller blank;

[0012] S3. Rough grinding and fine grinding are performed on both ends of the roller blank after rough grinding of the circumferential surface.

[0013] S4. Fine grind the circumferential surface of the roller blank after both ends are finely ground;

[0014] S5. Roughly grind and chamfer both ends of the roller blank;

[0015] S6. The roller blank after rough grinding and chamfering of both ends is limited on six sides by the clamping drive device and the grinding wheel device. The clamping drive device drives the roller blank to rotate along its axis, and the grinding wheel device performs spherical grinding on the rotating roller blank.

[0016] S7. Fine grinding and chamfering of the roller blank after spherical grinding;

[0017] S8. The roller blank after fine grinding and chamfering is ultra-fine ground to form a ceramic spherical roller.

[0018] Preferably, in step S2, the circumference of the roller blank after rough grinding is 0.004 to 0.006 mm, the cylindricity is 0.004 to 0.006 mm, and the surface roughness is Ra0.5 to 0.8.

[0019] Preferably, in step S3, the parallelism of the two ends of the roller blank after rough grinding is 0.002 to 0.004 mm, and the surface roughness is Ra0.4 to 0.6; the parallelism of the two ends of the roller blank after fine grinding is 0.001 to 0.002 mm, and the surface roughness is Ra0.2 to 0.4.

[0020] Preferably, in step S4, the circumference of the roller blank after circumferential surface grinding is 0.002-0.004 mm, the cylindricity is 0.002-0.004 mm, and the surface roughness is Ra0.32-0.5.

[0021] Preferably, in step S5, the working surface of the grinding wheel of the external cylindrical grinding machine is inclined at 45° relative to the axis of the roller blank.

[0022] Preferably, in step S6, the clamping drive device includes a lateral clamping mechanism, two limiting mechanisms, and two end-face drive mechanisms; the two end-face drive mechanisms are arranged opposite each other in the horizontal direction and respectively abut against the two end faces of the roller blank and drive the roller blank to rotate along its axis; the two limiting mechanisms are arranged opposite each other in the vertical direction and respectively abut against the outer peripheral surface of the roller blank; the lateral clamping mechanism and the grinding wheel device are arranged opposite each other in the horizontal direction and respectively abut against the outer peripheral surface of the roller blank, and the lateral clamping mechanism and the grinding wheel device can move towards each other to adjust the grinding allowance; the lateral clamping mechanism, the grinding wheel device, the two limiting mechanisms, and the two end-face drive mechanisms form six-sided limiting for clamping the roller blank.

[0023] Preferably, the lateral clamping mechanism includes a clamping telescopic component and a clamping unit; the clamping unit includes a mounting frame and two clamping rollers, the telescopic end of the clamping telescopic component is connected to the mounting frame, the two clamping rollers are arranged vertically and rotatably connected to the mounting frame, and the clamping rollers are in rolling connection with the outer circumferential surface of the roller blank.

[0024] Preferably, the limiting mechanism includes a limiting telescopic member and an abutting member; the telescopic end of the limiting telescopic member is connected to the abutting member; the abutting members of the two limiting mechanisms are arranged opposite each other and abut against the outer peripheral surface of the roller blank; the abutting position of the abutting member is located on the side of the roller blank away from the lateral pressing mechanism.

[0025] Preferably, the end face drive mechanism includes a drive member and an abutment shaft; the abutment shaft is connected to the output end of the drive member, and the output end of the drive member drives the abutment shaft to rotate along its own axis; the abutment shafts of the two end face drive mechanisms respectively abut against the end face of the roller blank, and the drive member drives the roller blank to rotate along its own axis through the abutment shaft.

[0026] Preferably, the clamping drive device further includes a first guide rail and a second guide rail that are perpendicular to each other on a horizontal plane; a lateral clamping mechanism and a grinding wheel device are slidably connected to the first guide rail; and two end face drive mechanisms are slidably connected to the second guide rail respectively.

[0027] (III) Beneficial Effects

[0028] The beneficial effects of this invention are:

[0029] The ceramic spherical roller processing method of the present invention provides a high-precision reference blank for subsequent spherical grinding through step-by-step pre-processing of the roller blank, including rough grinding of the circumferential surface, rough / fine grinding of both end faces, fine grinding of the circumferential surface, and rough grinding and chamfering. This significantly reduces the shape correction required during spherical grinding, thereby reducing grinding tool wear and processing time. Simultaneously, in conjunction with the six-sided limiting during spherical grinding, the clamping drive device, in conjunction with the grinding wheel device, can stably clamp the roller blank and drive its rotation, ensuring that the grinding trajectory of the grinding wheel device on the spherical surface is uniform and consistent. This improves the dimensional consistency and surface quality of the ceramic spherical roller, thereby increasing the finished product qualification rate and production efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram showing the cooperation between the clamping drive device and the grinding wheel device;

[0031] Figure 2 This is a partial schematic diagram of the clamping drive device and the grinding wheel device;

[0032] Figure 3 for Figure 2 A top view (the upper limiting mechanism is not shown);

[0033] Figure 4 for Figure 2 Front view (the end face drive mechanism on one side is not shown);

[0034] Figure 5 To determine the surface roughness and arc profile accuracy (Ra 0.06 and Pt 0.0005 mm) of the circumferential surface of the machined ceramic spherical roller;

[0035] Figure 6 The roundness of the processed ceramic spherical roller (RONt 0.0006mm).

[0036] [Explanation of Labels in the Attached Image]

[0037] 1: Clamping drive device; 11: Lateral clamping mechanism; 111: Clamping telescopic component; 112: Clamping unit; 1121: Mounting bracket; 1122: Clamping roller; 12: Limiting mechanism; 121: Limiting telescopic component; 122: Abutting component; 13: End face driving mechanism; 131: Driving component; 132: Abutting shaft; 14: First guide rail; 15: Second guide rail;

[0038] 2: Grinding wheel assembly; 21: Grinding wheel drive; 22: Grinding wheel; 23: Grinding wheel dresser;

[0039] a: Roller blank. Detailed Implementation

[0040] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] This invention provides a method for processing ceramic spherical rollers, comprising the following steps;

[0042] S1. After vacuum dewaxing, the pressed silicon nitride cylindrical blank is sintered by hot isostatic pressing to obtain cylindrical roller blank a.

[0043] S2. The circumferential surface of the roller blank a is rough ground by a centerless cylindrical grinding machine.

[0044] In step S2, the guide wheel speed in the centerless cylindrical grinder is 45–55 r / min, the grinding wheel speed is 1000–1200 r / min, and the feed rate is 0.05–0.10 mm / cycle. The grinding wheel in the centerless cylindrical grinder is made of 300# resin-bonded diamond abrasive. The rough grinding of the circumferential surface ensures that the roundness of the roller blank a is 0.004–0.006 mm, the cylindricity is 0.004–0.006 mm, and the surface roughness is Ra0.5–0.8, thereby ensuring that the cylindrical outer circumferential surface of the roller blank a has a stable coaxiality reference. During the double-end face grinding in step S3, the axis of the positioning blank can be determined based on this reference, avoiding end face machining deviations caused by irregularities in the cylindrical surface.

[0045] In this embodiment, the guide wheel speed in the centerless cylindrical grinding machine is 50 r / min, the grinding wheel speed is 1000 r / min, the feed rate is 0.05 mm / time, and the circumferential surface rough grinding makes the roundness of the circumferential surface of the roller blank a reach 0.004 mm, the cylindricity reach 0.004 mm, and the surface roughness reach Ra0.5.

[0046] S3. The two ends of the roller blank a after rough grinding of the circumferential surface are then rough ground and fine ground in sequence using a double-end surface grinder.

[0047] In step S3, a 270# CBN grinding wheel is used in the double-end grinding machine, and a grinding paste prepared with W20 grit diamond micro powder is used. The number of particles processed per batch is 15, and the processing time per batch is 90 seconds.

[0048] During double-end face rough grinding, the grinding wheel speed of the double-end face grinder is 1200 r / min, and the feed rate is 0.8 mm / min. After double-end face rough grinding, the parallelism of the two end faces of the roller blank a is 0.002~0.004 mm, and the surface roughness is Ra0.4~0.6. Preferably, double-end face rough grinding achieves a parallelism of 0.002 mm and a surface roughness of Ra0.4 for the two end faces of the roller blank a.

[0049] During double-end face finishing, the grinding wheel speed of the double-end face grinder is 1200 r / min, and the feed rate is 0.4 mm / min. The parallelism of the two end faces of the roller blank a after double-end face finishing is 0.001–0.002 mm, and the surface roughness is Ra0.2–0.4. Preferably, double-end face finishing achieves a parallelism of 0.002 mm and a surface roughness of Ra0.2 on both end faces of the roller.

[0050] In step S3, the two ends of the roller blank a are made into high-precision parallel reference surfaces. This allows the end face drive mechanism 13 in the clamping drive device 1 to stably abut against and drive the roller blank a to rotate based on these reference surfaces in the subsequent step S6. This ensures that the blank axis does not deviate during spherical grinding, thereby guaranteeing the spherical profile accuracy. At the same time, the high-precision end face also provides support for the angle accuracy of the fine grinding chamfer in the subsequent step S7.

[0051] S4. The circumferential surface of the roller blank a after the two end faces are finely ground is finely ground using a centerless cylindrical grinding machine.

[0052] In step S4, the grinding wheel in the centerless cylindrical grinder is made of 300# resin-bonded diamond abrasive, resulting in a guide wheel speed of 45–55 r / min, a grinding wheel speed of 1000–1200 r / min, and a feed rate of 0.02–0.05 mm / cycle. After circumferential grinding, the roundness of the circumferential surface of the roller blank a is 0.002–0.004 mm, the cylindricity is 0.002–0.004 mm, and the surface roughness is Ra 0.32–0.5. The lower surface roughness of the cylindrical surface after fine grinding reduces the rough friction between the grinding wheel and the surface of the roller blank a during spherical grinding, allowing the grinding wheel device 2 in step S6 to cut the material more uniformly and improving the smoothness of the spherical surface.

[0053] In this embodiment, the guide wheel speed in the centerless cylindrical grinder is 50 r / min, the grinding wheel speed is 1000 r / min, and the feed rate is 0.02 mm / cycle. The circumferential surface of the roller blank a after circumferential surface finishing has a roundness of 0.002 mm, a cylindricity of 0.002 mm, and a surface roughness of Ra0.32.

[0054] S5. Roughly grind and chamfer both ends of the roller blank a using an external cylindrical grinding machine.

[0055] In step S5, the roller is positioned using a three-jaw chuck, and the working surface of the grinding wheel of the cylindrical grinding machine is inclined at 45° relative to the axis of the roller blank a. The grinding wheel of the cylindrical grinding machine is made of 270# electroplated diamond material, the grinding wheel speed is 8000-10000 r / min, the workpiece speed is 400-450 r / min, and the feed rate is 0.2-0.3 mm / min.

[0056] In this embodiment, the grinding wheel speed is 8000 r / min, the workpiece speed is 400 r / min, the feed rate is 0.2 mm / min, the chamfer rough grinding is performed by plunge grinding, and the chamfer removal amount is 0.3 mm.

[0057] By rough grinding and chamfering the two ends of the roller blank a before spherical grinding, the amount of material removed from the two ends of the circumferential surface during subsequent spherical grinding is reduced, the wear of the grinding wheel working surface is reduced, and the efficiency of subsequent spherical grinding is improved.

[0058] S6. The roller blank a, after rough grinding and chamfering of both ends, is limited on six sides by the clamping drive device 1 in conjunction with the grinding wheel device 2. The clamping drive device 1 drives the roller blank a to rotate along its axis, and at the same time, the grinding wheel device 2 performs spherical grinding on the rotating roller blank a. The clamping drive device 1 is described in detail below.

[0059] S7. The roller blank a after spherical grinding is finely ground and chamfered using an external cylindrical grinding machine.

[0060] In step S7, the external cylindrical grinding machine uses a 270# electroplated diamond grinding wheel with a concave arc-shaped working surface. The grinding wheel speed is 10000 r / min, the workpiece speed is 400 r / min, and the feed rate is 0.1 mm / min.

[0061] S8. The roller blank a, after being finely ground and chamfered, is subjected to ultra-precision grinding using an ultra-precision machine to form a ceramic spherical roller.

[0062] In step S8, the ultra-precision machine uses a 4000# CBN oilstone for oscillating ultra-precision machining. The ultra-precision head vibration frequency is 1000 times / min, the ultra-precision pressure is 0.7MPa, the ultra-precision machining time is 20s, and the workpiece rotation speed is 150r / min. Figure 5 and Figure 6 As shown, the roundness of the outer circumference of the ceramic spherical roller formed after ultra-precision machining is 0.0006 mm, the surface roughness reaches Ra0.06, and the arc contour accuracy reaches 0.0005 mm.

[0063] In this embodiment, the finished ceramic spherical roller has a diameter of 5mm, a height of 5.4mm, and a spherical radius of 14.5mm. Of course, ceramic spherical rollers of different specifications can be produced according to actual needs.

[0064] The ceramic spherical roller processing method of this embodiment provides a high-precision reference blank for subsequent spherical grinding by performing step-by-step pre-processing of the roller blank a, including rough grinding of the circumferential surface, rough / fine grinding of both end faces, fine grinding of the circumferential surface, and rough grinding and chamfering. This significantly reduces the amount of shape correction required during spherical grinding, thereby reducing grinding tool wear and processing time. Simultaneously, in conjunction with the six-sided limiting during spherical grinding, the clamping drive device 1, together with the grinding wheel device 2, can stably clamp the roller blank a and drive its rotation, ensuring that the grinding trajectory of the grinding wheel device 2 on the spherical surface is uniform and consistent. This improves the dimensional consistency and surface quality of the ceramic spherical roller, thereby increasing the finished product qualification rate and production efficiency.

[0065] like Figure 1As shown, the clamping drive device 1 in step S6 includes a lateral clamping mechanism 11, two limiting mechanisms 12, two end face drive mechanisms 13, and a first guide rail 14 and a second guide rail 15 arranged perpendicularly to each other on a horizontal plane. The lateral clamping mechanism 11 and the grinding wheel device 2 are slidably connected to the first guide rail 14, and the two end face drive mechanisms 13 are slidably connected to the second guide rail 15 respectively.

[0066] Two end-face drive mechanisms 13 are arranged opposite each other in the horizontal direction and abut against the two end faces of the roller blank a, respectively, driving the roller blank a to rotate along its axis. Two limiting mechanisms 12 are arranged opposite each other in the vertical direction and abut against the outer peripheral surface of the roller blank a. The lateral clamping mechanism 11 and the grinding wheel device 2 are arranged opposite each other in the horizontal direction and abut against the outer peripheral surface of the roller blank a. The lateral clamping mechanism 11 and the grinding wheel device 2 can move towards each other to adjust the grinding allowance. The lateral clamping mechanism 11, the two limiting mechanisms 12 and the two end-face drive mechanisms 13, together with the grinding wheel device 2, form a six-sided limiting for the roller blank a to clamp the roller blank a. The six-sided limiting specifically refers to the comprehensive limiting of the roller blank a in the six directions of up and down, left and right, and front and back in the three-dimensional space.

[0067] like Figure 1 , Figure 3 and Figure 4 As shown, the lateral clamping mechanism 11, two limiting mechanisms 12, and two end face driving mechanisms 13 of the clamping drive device 1, together with the grinding wheel device 2, form a "six-sided limiting" that fixes the roller blank a in all three dimensions, avoiding the problems of movement and shaking that are prone to occur in the traditional clamping method. This ensures that the axis remains stable when the end face driving mechanism 13 drives the roller blank a to rotate, thereby ensuring that the grinding trajectory of the grinding wheel device 2 can strictly conform to the designed spherical curve.

[0068] The lateral clamping mechanism 11 and the grinding wheel device 2 can move towards each other, and can flexibly adjust the grinding allowance according to the actual size deviation of the roller blank a of different specifications (such as slight diameter difference after sintering). There is no need to change the clamping fixture, which can adapt to the processing needs of various types of ceramic spherical rollers and reduce the time and cost of tooling change.

[0069] The two end face drive mechanisms 13 can directly drive the roller blank a to rotate along the axis while achieving axial limit. No additional drive device is required, which simplifies the overall structure of the equipment. Moreover, the drive torque is uniformly transmitted through the end face, avoiding slippage or surface damage of the roller blank a caused by the outer peripheral surface drive, ensuring stable rotation speed, and improving the uniformity and processing efficiency of spherical grinding.

[0070] The lateral clamping mechanism 11 and the grinding wheel device 2 slide along the first guide rail 14, and the horizontal distance between them can be adjusted according to the diameter of the roller blank a. The two end face driving mechanisms 13 slide with the two spaced second guide rails 15 respectively, and the axial distance between them can be adjusted according to the length of the roller blank a. The clamping driving device 1 can be adapted to the processing of ceramic spherical rollers of different lengths and diameters, thus improving the versatility of the equipment.

[0071] like Figure 2 As shown, the lateral clamping mechanism 11 includes a clamping telescopic member 111 and a clamping unit 112. The clamping unit 112 includes a mounting frame 1121 and two clamping rollers 1122. The telescopic end of the clamping telescopic member 111 is connected to the mounting frame 1121. The two clamping rollers 1122 are arranged vertically and are rotatably connected to the mounting frame 1121. The clamping rollers 1122 are in rolling connection with the outer peripheral surface of the roller blank a.

[0072] The lateral clamping mechanism 11 employs two vertically arranged clamping rollers 1122 to apply a balanced clamping force to the roller blank a in the vertical direction. The center line connecting the contact points of the two vertically arranged clamping rollers 1122 and the roller blank a passes through the axis of the roller blank a, preventing blank tilting or uneven force distribution caused by single-roller clamping, and further improving the stability of the clamping drive device 1. Simultaneously, the clamping rollers 1122 of the lateral clamping mechanism 11 are in rolling contact with the outer circumferential surface of the roller blank a, preventing scratches, indentations, and other damage to the surface of the roller blank a caused by sliding friction, ensuring the initial surface quality for subsequent spherical grinding.

[0073] like Figure 2 As shown, the limiting mechanism 12 includes a limiting telescopic member 121 and an abutting member 122. The telescopic end of the limiting telescopic member 121 is connected to the abutting member 122. The abutting members 122 in the two limiting mechanisms 12 are arranged opposite each other and abut against the outer peripheral surface of the roller blank a. The abutting position of the abutting member 122 is located on the side of the roller blank a away from the lateral pressing mechanism 11.

[0074] The limiting mechanism 12 adjusts the position of the abutment 122 in the vertical height through the limiting telescopic component 121, which can flexibly adjust the abutment position for roller blanks a of different diameters without replacing the limiting component, adapting to the processing needs of various types of roller blanks a and reducing tooling adjustment time.

[0075] During the spherical grinding process in step S6, the lateral clamping mechanism 11 needs to apply a certain clamping force to the roller blank a to improve clamping stability. However, this clamping force can easily cause the roller blank a to shift away from the lateral clamping mechanism 11. By setting the abutting position of the abutting member 122 on the side of the roller blank a's axis away from the lateral clamping mechanism 11 and abutting against the roller blank a, the axial movement of the roller blank a is effectively prevented. This ensures that the central axis of the roller blank a remains stable during its rotation, providing a precise positional reference for spherical grinding, ensuring consistency between the grinding trajectory and the designed spherical surface, and improving the product qualification rate. Specifically, the angle between the abutting position of the abutting member 122 and the vertical plane passing through the midpoint of the roller blank a is 30°-45° to improve the clamping effect of the lateral clamping mechanism 11, thereby ensuring the clamping stability of the clamping device 1.

[0076] To reduce the impact of the abutment 122 on the surface of the roller blank a, the side of the abutment 122 closest to the roller blank a has an inclined structure. This inclined surface can minimize the contact area between the abutment 122 and the outer peripheral surface of the roller blank a, thereby reducing the frictional resistance between the two while ensuring the limiting function, and avoiding scratches or wear on the outer peripheral surface of the roller blank a due to friction.

[0077] It should be noted that in the initial stage of step S6, the roller blank a still maintains a cylindrical shape. At this time, the abutment 122 undertakes the main limiting function, ensuring the stability of the blank's rotation through accurate positioning. As the grinding process progresses, the outer circumference of the roller blank a gradually forms a spherical profile. When the spherical shape is initially formed, the blank will be more compatible with the grinding wheel of the grinding wheel device 2. At this time, the contact support of the grinding wheel can help maintain the stability of the blank's position, and the limiting effect of the abutment 122 will gradually weaken, thus avoiding excessive limiting that would affect the spherical formation.

[0078] like Figure 2 As shown, the end face drive mechanism 13 includes a drive member 131 and an abutment shaft 132. The abutment shaft 132 is connected to the output end of the drive member 131. The output end of the drive member 131 drives the abutment shaft 132 to rotate along its own axis. The abutment shafts 132 of the two end face drive mechanisms 13 respectively abut against the end face of the roller blank a. The axes of the abutment shaft 132 and the roller blank a are collinear. The drive member 131 drives the roller blank a to rotate along its own axis through the abutment shaft 132.

[0079] The end face drive mechanism 13 directly abuts against the end face of the roller blank a through the abutment shaft 132. The drive torque is transmitted through the central area of ​​the end face. The contact area is large and the force is concentrated, which can effectively avoid the problem of roller blank a slipping due to insufficient friction in the traditional peripheral surface drive method, ensure that the rotation speed is consistent with the set value, and ensure the uniformity of the grinding wheel trajectory.

[0080] Meanwhile, the driving point is located on the end face rather than the outer peripheral face, which avoids frictional contact between the driving device and the outer peripheral face of the roller blank a when driving on the outer peripheral face.

[0081] In the spherical grinding process of step S6, the grinding wheel device 2 includes a grinding wheel drive 21, a grinding wheel 22, and a grinding wheel dresser 23. The grinding wheel drive 21 is used to drive the grinding wheel 22 to rotate at high speed around its own axis to achieve spherical cutting of the roller blank a. The grinding wheel dresser 23 is set on one side of the grinding wheel and can dress the working surface of the grinding wheel 22 in real time or periodically to remove wear debris from the surface of the grinding wheel and restore the sharpness of the cutting edge of the grinding wheel 22 and the flatness of the working surface.

[0082] By setting the grinding wheel dresser 23, the problem of dulling caused by long-term grinding of the grinding wheel can be effectively avoided, ensuring that the grinding wheel maintains stable cutting performance during each grinding, and further improving the machining accuracy and overall production efficiency of ceramic spherical rollers.

[0083] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0084] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0086] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for processing ceramic spherical rollers, characterized in that, The following steps are adopted; S1. After vacuum dewaxing, the pressed silicon nitride cylindrical blank is sintered by hot isostatic pressing to obtain the roller blank. S2. Roughly grind the circumferential surface of the roller blank; S3. The two ends of the roller blank after rough grinding of the circumferential surface are then rough ground and fine ground in sequence; S4. Fine grind the circumferential surface of the roller blank after both ends are finely ground; S5. Roughly grind and chamfer both ends of the roller blank; S6. The roller blank after rough grinding and chamfering of both ends is constrained on six sides by the clamping drive device and the grinding wheel device, and the clamping drive device drives the roller blank to rotate along its axis, while the grinding wheel device performs spherical grinding on the rotating roller blank. S7. Fine grinding and chamfering are performed on the roller blank after spherical grinding; S8. The roller blank after fine grinding and chamfering is ultra-fine ground to form a ceramic spherical roller.

2. The method for processing ceramic spherical rollers as described in claim 1, characterized in that: In step S2; The circumferential surface of the roller blank after rough grinding has a roundness of 0.004 to 0.006 mm, a cylindricity of 0.004 to 0.006 mm, and a surface roughness of Ra0.5 to 0.

8.

3. The method for processing ceramic spherical rollers as described in claim 1, characterized in that: In step S3; The parallelism of the two end faces of the roller blank after rough grinding is 0.002~ 0.004mm, surface roughness Ra0.4~0.6; The parallelism of the two end faces of the roller blank after double-end precision grinding is 0.001~ 0.002mm, surface roughness is Ra0.2~0.

4.

4. The method for processing ceramic spherical rollers as described in claim 1, characterized in that: In step S4; The circumferential surface of the roller blank after precision grinding has a roundness of 0.002 to 0.004 mm, a cylindricity of 0.002 to 0.004 mm, and a surface roughness of Ra 0.32 to 0.

5.

5. The method for processing ceramic spherical rollers as described in claim 1, characterized in that: In step S5, The rough-ground chamfered working surface is inclined at 45° relative to the axis of the roller blank.

6. The method for processing ceramic spherical rollers as described in claim 1, characterized in that: In step S6; The clamping drive device includes a lateral pressing mechanism, two limiting mechanisms, and two end face driving mechanisms; The two end-face driving mechanisms are arranged opposite each other in the horizontal direction and respectively abut against the two end faces of the roller blank, driving the roller blank to rotate along its axis; The two limiting mechanisms are arranged opposite each other in the vertical direction and respectively abut against the outer peripheral surface of the roller blank; The lateral clamping mechanism and the grinding wheel device are arranged opposite each other in the horizontal direction and respectively abut against the outer peripheral surface of the roller blank. The lateral clamping mechanism and the grinding wheel device can move towards each other to adjust the grinding allowance. The lateral clamping mechanism, the grinding wheel device, the two limiting mechanisms, and the two end face driving mechanisms form six-sided limiting positions for clamping the roller blank.

7. The method for processing ceramic spherical rollers as described in claim 6, characterized in that: The lateral clamping mechanism includes a clamping telescopic component and a clamping unit; The clamping unit includes a mounting frame and two clamping rollers. The telescopic end of the clamping telescopic member is connected to the mounting frame. The two clamping rollers are arranged vertically and rotatably connected to the mounting frame. The clamping rollers are in rolling contact with the outer circumferential surface of the roller blank.

8. The method for processing ceramic spherical rollers as described in claim 7, characterized in that: The limiting mechanism includes a limiting telescopic component and an abutment component; The telescopic end of the limiting telescopic member is connected to the abutting member; The abutting parts in the two limiting mechanisms are arranged vertically opposite each other and abut against the outer peripheral surface of the roller blank; The contact position of the abutting member is located on the side of the roller blank away from the lateral pressing mechanism along its axis.

9. The method for processing ceramic spherical rollers as described in claim 6, characterized in that: The end face driving mechanism includes a driving component and an abutment shaft; The abutment shaft is connected to the output end of the drive member, and the output end of the drive member drives the abutment shaft to rotate along its own axis; The abutment shafts of the two end face driving mechanisms abut against the end face of the roller blank, and the driving member drives the roller blank to rotate along its own axis through the abutment shafts.

10. The method for processing ceramic spherical rollers as described in claim 6, characterized in that: The clamping drive device also includes a first guide rail and a second guide rail that are perpendicular to each other on a horizontal plane. The lateral clamping mechanism and the grinding wheel device are slidably connected to the first guide rail; The two end-face drive mechanisms are slidably connected to the second guide rail.

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