Method for machining arc contact sites of a sealed bearing inner ring

Abstract

The application belongs to the technical field of bearing machining process, and particularly relates to a machining method for arc surface contact position of inner ring of sealed bearing. Two end points on each generatrix of the inner ring arc surface are respectively inner end point and outer end point, and the contact position of each generatrix with the sealing ring is a contact point. Among the inner end point, the outer end point and the contact point corresponding to each generatrix, the size of the three points along the axial direction to the nearest inner ring end surface is b1, b2, b3, and the size of the three points along the radial direction to the other end of the inner ring radial direction is d1, d2, d3. The first segment arc surface from the inner end point to the contact point is machined through the parameters b1, d1, b3, d3, the second segment arc surface from the contact point to the outer end point is machined through the parameters b3, d3, b2, d2, and the first segment arc surface and the second segment arc surface are connected to form a complete inner ring arc surface. Through the control of the size of the contact position of the inner ring and the sealing ring, the uniqueness of the contact between the sealing ring and the arc surface is effectively ensured, and the bearing rotation flexibility and the sealing performance are indirectly ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing processing technology, and in particular relates to a method for processing the contact part of the arc surface of the inner ring of a sealed bearing. Background Art

[0002] The outer ring of the sealed spherical roller bearing is a normal sealing structure with a sealing groove, and the contact part of the inner ring is an arc surface. After the sealing ring is installed, one end of the inner diameter contacts the arc surface of the inner ring, and the sealing performance is achieved by pressing the sealing ring with a spring retaining ring. Figure 1 The size of the arc surface contact part of the inner ring of the sealed bearing is difficult to control during processing. If the interference is too large, it is easy to cause instability, and if the interference is too small, it is easy to leak grease. Summary of the Invention

[0003] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a method for processing the contact portion of the arc surface of the inner ring of a sealed bearing, so as to ensure the accurate size of the contact portion and the sealing performance.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a method for processing the contact part of the arc surface of the inner ring of a sealed bearing, wherein the two endpoints on each busbar of the arc surface of the inner ring are respectively the inner endpoint and the outer endpoint, and the contact part of each busbar with the sealing ring is the contact point. Among the inner endpoint, outer endpoint and contact point corresponding to each busbar, the dimension from the inner endpoint in the axial direction to the nearest inner ring end face is set as the first axial length b1, and the dimension from the inner endpoint in the radial direction to the inner endpoint of the other radial end of the inner ring is set as the first radial length d1; the dimension from the outer endpoint in the axial direction to the nearest inner ring end face is set as the first radial length b2. The second axial length b2 is set, and the dimension from the outer end point to the outer end point of the other radial end of the inner ring is set as the second radial length d2; the dimension from the contact point to the nearest inner ring end face along the axial direction is set as the third axial length b3, and the dimension from the contact point to the contact point at the other radial end of the inner ring is set as the third radial length d3; the first arc surface from the inner end point to the contact point is processed by parameters b1, d1, b3, and d3, and the second arc surface from the contact point to the outer end point is processed by parameters b3, d3, b2, and d2. The first arc surface and the second arc surface are connected to form a complete inner ring arc surface.

[0005] Furthermore, the contact point is the position where the contact portion of the inner ring arc surface and the midpoint of the sealing ring width are assembled correspondingly.

[0006] Furthermore, during processing, one of the two parameter values ​​of the inner endpoint, the first axial length b1 and the first radial length d1, is provided with a tolerance float; during processing, one of the two parameter values ​​of the outer endpoint, the second axial length b2 and the second radial length d2, is provided with a tolerance float; during processing, one of the two parameter values ​​of the contact point, the third axial length b3 and the third radial length d3, is provided with a tolerance float.

[0007] Furthermore, the first radial length d1 , the second axial length b2 and the third radial length d3 have tolerance fluctuations.

[0008] Furthermore, the first arc surface and the second arc surface are both processed by CNC machine tools.

[0009] Furthermore, after the inner ring arc surface is machined, a profilometer is used to detect whether the arc surface radius Ra1 of the inner ring arc surface meets product requirements.

[0010] Furthermore, the arc surface radius required by the product has a tolerance fluctuation, and the arc surface radius detected by the profilometer is a qualified product if it is within the tolerance fluctuation.

[0011] Furthermore, the outer endpoint is located on a side of the inner ring arc surface close to the inner ring end face; and the inner endpoint is located on a side of the inner ring arc surface close to the inner ring axial center.

[0012] The beneficial effects of the present invention are as follows: by controlling the size of the contact portion between the inner ring and the sealing ring, the uniqueness of the contact between the sealing ring and the arc surface is effectively guaranteed, and the rotation flexibility and sealing performance of the bearing are indirectly guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of a sealed spherical roller bearing;

[0014] Figure 2 This is a schematic diagram of the inner ring structure of a spherical roller bearing;

[0015] Figure 3 This is a schematic diagram of double-point control processing;

[0016] Figure 4 Schematic diagram of the sealing ring contact point;

[0017] Figure 5 This is a schematic diagram of three-point control processing;

[0018] Figure 6 Drawings of arc surface processing products (not inner circle);

[0019] Figure 7 For processing Figure 6 The machine tool parameters of the product are given;

[0020] Figure 8 For processing Figure 6 Machine tool path diagram of the product;

[0021] Figure 9 For the finished product drawing;

[0022] In the figure: 1. Cage, 2. Roller, 3. Outer ring, 4. Circlip, 5. Sealing ring, 6. Inner ring, 7. Arc surface, 8. Sealing ring contact point. DETAILED DESCRIPTION

[0023] In order to make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] See attached Figure 1-5 , in the early stage of technology, Figure 3 The two-point arc surface control processing method shown in the figure, during processing, the diameter size of d1 is first processed into the tolerance range, and then the arc surface Ra1 is processed based on the four sizes of b1, b2, d1 and d2. The processed arc surface Ra1 is measured using a profilometer.

[0025] According to the requirements of the product drawings, the processing technology only needs to control the radius of the Ra1 arc surface while ensuring the four dimensions b1, b2, d1, and d2 in the enlarged figure. However, due to the tolerance fluctuations of Ra1, b2, and d1, the dimensions of the processed arc surface Ra1, especially the contact part with the inner diameter of the sealing ring, will deviate.

[0026] Even after adopting this machining method and undergoing assembly and testing, the following phenomenon still persisted: visual inspection revealed that the seal ring was unstable on the inner ring's curved surface during outer ring rotation, exhibiting axial wobble. After bearing assembly, the diameter of the area directly in contact with the seal ring exhibited deviations. Some bearing structures still exhibited excessive or insufficient interference fit at the seal. Excessive interference fit easily resulted in instability, while insufficient interference fit easily led to grease leakage.

[0027] Therefore, we continue to improve on the basis of the above process, increase the contact part control dimensions b3 and d3, and the specific position of the contact part is based on the middle of the sealing ring width. Figure 5 , the specific contents are as follows:

[0028] The processing method of the contact part of the arc surface of the inner ring of the sealed bearing is as follows: the two endpoints on each busbar of the arc surface of the inner ring are the inner endpoint and the outer endpoint respectively; the contact part of each busbar with the sealing ring is the contact point; among the inner endpoint, outer endpoint and contact point corresponding to each busbar, the size of the inner endpoint along the axial direction to the nearest inner ring end face is set as the first axial length b1, the size of the inner endpoint along the radial direction to the inner endpoint of the other radial end of the inner ring is set as the first radial length d1; the size of the outer endpoint along the axial direction to the nearest inner ring end face is set as the second axial length b2, Set the dimension from the outer end point along the radial direction to the outer end point at the other radial end of the inner ring as the second radial length d2; set the dimension from the contact point along the axial direction to the nearest inner ring end face as the third axial length b3, and set the dimension from the contact point along the radial direction to the contact point at the other radial end of the inner ring as the third radial length d3; use parameters b1, d1, b3, and d3 to process the first arc surface from the inner end point to the contact point, and use parameters b3, d3, b2, and d2 to process the second arc surface from the contact point to the outer end point, and the first arc surface and the second arc surface are connected to form a complete inner ring arc surface.

[0029] Based on the above technical solution, it should be noted that the arc surface can be regarded as the trajectory of an arc moving continuously in space, and the arc that generates the arc surface is the generatrix, such as Figure 5 The arc formed by the cross section of the inner ring of the middle bearing is the generatrix of the inner ring arc surface.

[0030] Furthermore, the contact point is the position where the contact portion of the inner ring arc surface and the midpoint of the sealing ring width are assembled correspondingly.

[0031] Furthermore, during machining, one of the two parameter values ​​of the inner endpoint, the first axial length b1 and the first radial length d1, is provided with a tolerance float; during machining, one of the two parameter values ​​of the outer endpoint, the second axial length b2 and the second radial length d2, is provided with a tolerance float; during machining, one of the two parameter values ​​of the contact point, the third axial length b3 and the third radial length d3, is provided with a tolerance float. Figure 5 As shown, the first radial length d1 , the second axial length b2 and the third radial length d3 have tolerance fluctuations.

[0032] Furthermore, the first and second arc sections are both machined using a CNC machine tool. The above parameters b1, d1, b2, d2, b3, and d3 are input into a control console of the CNC machine tool to machine the corresponding arc sections.

[0033] Furthermore, after the inner ring arc surface is machined, a profilometer is used to check whether the arc radius Ra1 of the inner ring arc surface meets the product requirements. The arc radius required by the product has a tolerance fluctuation. If the arc radius detected by the profilometer is within the tolerance fluctuation, the product is qualified.

[0034] Furthermore, the outer endpoint is located on a side of the inner ring arc surface close to the inner ring end face; and the inner endpoint is located on a side of the inner ring arc surface close to the inner ring axial center.

[0035] The present invention divides the entire arc surface into two sections for processing. The newly added contact point is the end point of the first arc and the starting point of the second arc, thereby controlling the dimensional accuracy of the contact point position at the intersection. Through the two-way control of the size of the contact part between the arc surface Ra1 and the sealing ring, the unique contact between the sealing ring and the arc surface is effectively guaranteed, and the rotation flexibility and sealing performance of the bearing are indirectly guaranteed.

[0036] It should be noted that the parts not described in detail in the present invention are prior art.

[0037] The above examples are merely preferred embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many variations are possible. All variations that can be directly derived or imagined by a person skilled in the art from the disclosure of the present invention should be considered to be within the scope of protection of the present invention.

Claims

1. A method for processing the contact portion of the arc surface of the inner ring of a sealed bearing, characterized by: The two endpoints on each busbar of the inner ring arc surface are the inner endpoint and the outer endpoint respectively. The contact part of each busbar with the sealing ring is the contact point. For the inner endpoint, outer endpoint and contact point corresponding to each busbar, the dimension from the inner endpoint in the axial direction to the nearest inner ring end face is set as the first axial length b1, and the dimension from the inner endpoint in the radial direction to the inner endpoint at the other radial end of the inner ring is set as the first radial length d1 according to the product design dimensions; the dimension from the outer endpoint in the axial direction to the nearest inner ring end face is set as the second axial length b2, and the dimension from the outer endpoint in the radial direction to the outer endpoint at the other radial end of the inner ring is set as the second radial length d2; the dimension from the contact point in the axial direction to the nearest inner ring end face is set as the third axial length b3, and the dimension from the contact point in the radial direction to the contact point at the other radial end of the inner ring is set as the third radial length d3; the first segment of the arc surface from the inner endpoint to the contact point is processed using parameters b1, d1, b3, and d3, and the second segment of the arc surface from the contact point to the outer endpoint is processed using parameters b3, d3, b2, and d2. The first segment of the arc surface and the second segment of the arc surface are connected to form a complete inner ring arc surface.

2. The method for machining the arc surface contact portion of the inner ring of a sealed bearing according to claim 1, characterized in that: The contact point is the position where the contact part of the inner ring arc surface and the midpoint of the sealing ring width are assembled correspondingly.

3. The method for machining the arc surface contact portion of the inner ring of a sealed bearing according to claim 1, characterized in that: During processing, one of the two parameter values ​​of the inner endpoint, the first axial length b1 and the first radial length d1, is provided with a tolerance float; during processing, one of the two parameter values ​​of the outer endpoint, the second axial length b2 and the second radial length d2, is provided with a tolerance float; during processing, one of the two parameter values ​​of the contact point, the third axial length b3 and the third radial length d3, is provided with a tolerance float.

4. The method for machining the arc surface contact portion of the inner ring of a sealed bearing according to claim 1 or 3, characterized in that: The first radial length d1 , the second axial length b2 , and the third radial length d3 have tolerance fluctuations.

5. The method for machining the arc surface contact portion of the inner ring of a sealed bearing according to any one of claims 1 to 3, characterized in that: The first arc surface and the second arc surface are both processed by CNC machine tools.

6. The method for machining the arc surface contact portion of the inner ring of a sealed bearing according to any one of claims 1 to 3, characterized in that: After the inner ring arc surface is machined, a profilometer is used to detect whether the arc surface radius Ra1 of the inner ring arc surface meets the product requirements.

7. The method for machining the arc surface contact portion of the inner ring of a sealed bearing according to any one of claim 6, characterized in that: The arc surface radius required by the product has a tolerance fluctuation. The arc surface radius detected by the profilometer is a qualified product if it is within the tolerance fluctuation.

8. The method for machining the arc surface contact portion of the inner ring of a sealed bearing according to claim 1, characterized in that: The outer endpoint is located on the side of the inner ring arc surface close to the inner ring end surface; the inner endpoint is located on the side of the inner ring arc surface close to the inner ring axial center.

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