Protrusion control and pairing method after coating treatment of angular contact ball bearing

Abstract

The invention relates to the technical field of protrusion control and pairing of angular contact ball bearings, in particular to a protrusion control method and pairing method of an angular contact ball bearing after coating treatment. The control method comprises the following steps: determining a projection change value and an end face grinding value after coating by listing a projection function relation and combining differential calculation of coating thickness related parameters, so as to realize accurate control of the projection; meanwhile, the invention provides a pairing method based on the control method. The pairing method comprises the steps of part data measurement, end face coping, channel coating, assembly pairing, remeasurement adjustment and the like. The technical effect of improving the protrusion precision and the pairing efficiency of the angular contact ball bearing after coating treatment is achieved, the problem that the protrusion is affected by the coating process is effectively solved, and the assembling performance and reliability of the bearing are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of the protrusion amount control and matching of angular contact ball bearings, and in particular to a method for controlling the protrusion amount and matching of angular contact ball bearings after coating treatment. Background Art

[0002] Angular contact ball bearings are widely used in various mechanical equipment. They can bear combined radial and axial loads simultaneously and have a relatively high operating speed. To meet the requirements of different working conditions, angular contact ball bearings are usually used in pairs, such as face-to-face pairing (DF) or back-to-back pairing (DB), to improve stiffness and service life. Especially in aerospace mechanisms, in order to improve performance, the raceway grooves of angular contact ball bearings often need to be coated to form a film layer with a thickness of 1-2 microns, which provides lubrication for the bearings and prevents cold welding between the bearing rings and steel balls in a vacuum environment.

[0003] In actual production, in order to achieve the precise matching of angular contact ball bearings, the commonly used methods usually include: screening the bearing shape dimensions, rotational accuracy, contact angle, protrusion amount and other indicators according to relevant standards, and by measuring and grinding the height of the inner ring or outer ring end face, so that the sum of the protrusion amounts of the two bearings used in pair reaches the preset tolerance range. In addition, before coating, the bearings usually have completed preliminary matching, but after coating, due to the influence of the film layer thickness, the protrusion amount will change significantly, thereby affecting the final matching state.

[0004] To solve the problem of significant change in the protrusion amount after coating, the manual grinding amount is large, the efficiency is low, and the risk is high, resulting in difficulty in ensuring production quality and efficiency. Summary of the Invention

[0005] In order to improve production quality and efficiency, the present application provides a method for controlling the protrusion amount and matching of angular contact ball bearings after coating treatment.

[0006] In the first aspect, the present application provides a method for controlling the protrusion amount of angular contact ball bearings after coating treatment, adopting the following technical solution: A method for controlling the protrusion amount of angular contact ball bearings after coating treatment, comprising: listing the functional relationship of the protrusion amount according to the geometric structure and calculating the original value of the protrusion amount, differentiating the parameters related to the coating thickness in the functional relationship, calculating the change value of the protrusion amount after coating, determining the grinding value of the end face based on the original value and the change value.

[0007] By adopting the above technical solutions, the influence of coating treatment on the protrusion amount of angular contact ball bearings can be accurately calculated, so as to reserve corresponding compensation values in advance when grinding the end face. This method effectively avoids the problem of poor bearing pairing caused by significant changes in the protrusion amount after coating. Ultimately, this method significantly improves the assembly accuracy and working efficiency of the bearings, reduces the need for manual grinding, and improves the production quality and efficiency.

[0008] Preferably, the parameters related to the coating thickness include the inner ring groove curvature radius, the outer ring groove curvature radius, and the radial clearance.

[0009] By adopting the above technical solutions, the influencing factors of coating treatment on the protrusion amount of angular contact ball bearings are accurately identified. Specifically, clarifying the inner ring groove curvature radius, the outer ring groove curvature radius, and the radial clearance as parameters related to the coating thickness helps to improve the accuracy of subsequent differential calculations, thereby providing a reliable basis for determining the change value of the protrusion amount after coating. Ultimately, it ensures that the influence of coating can be effectively compensated when grinding the end face, improving the production quality and efficiency.

[0010] Preferably, the functional relationship: where, δ - protrusion amount, G r - radial clearance, R e - outer ring groove curvature radius, R i - inner ring groove curvature radius, D w - ball diameter, B - inner ring width, a e - outer ring groove position, a i - inner ring groove position.

[0011] By adopting the above technical solutions, the mathematical relationship between the protrusion amount of angular contact ball bearings and each key parameter is accurately established. This functional relationship comprehensively considers the influence of factors such as radial clearance, inner and outer ring groove curvature radii, ball diameter, inner ring width, and inner and outer ring groove positions on the protrusion amount, thus providing a theoretical basis for predicting the change of the protrusion amount after subsequent coating treatment.

[0012] It helps to accurately calculate the required grinding amount before coating, ensure that the bearing pairing state after coating meets the design requirements, avoid the preload deviation caused by the change of the protrusion amount, and further improve the operating performance and service life of the bearings.

[0013] Preferably, the calculation formula for the change value of the protrusion amount after coating:

[0014] By adopting the above technical solutions, the change value of the protrusion amount of the angular contact ball bearing after coating is accurately calculated. The specific effects include: First, the calculation accuracy is improved. By considering the influence of the changes in the inner ring groove curvature radius, outer ring groove curvature radius, and radial clearance on the protrusion amount, the stability of the bearing mating state before and after coating is ensured; Second, the grinding process is optimized. Based on the accurate change value of the protrusion amount, the end face grinding amount can be reasonably adjusted before coating, avoiding the preload deviation caused by the change in the protrusion amount after coating, thereby improving the assembly accuracy and service life of the bearing.

[0015] Preferably, when the coating thickness is t, ΔG r =-4t, ΔR e =-t, ΔR i =-t.

[0016] By adopting the above technical solutions, this quantitative relationship enables the prediction of the influence of coating on the protrusion amount before the coating treatment, thereby providing an accurate basis for end face grinding, effectively avoiding the mating accuracy problem caused by the change in the protrusion amount after coating, and improving the production efficiency and product quality.

[0017] The linear relationship between the coating thickness t and the change amounts of each parameter simplifies the calculation process and ensures the accuracy of protrusion amount control.

[0018] In the second aspect, the present application provides a mating method for an angular contact ball bearing after coating treatment, adopting the following technical solutions: A mating method for an angular contact ball bearing after coating treatment, comprising: Measuring part data, Calculating the grinding value according to the above control method, Grinding the end face, Coating the raceway, Assembling and mating.

[0019] By adopting the above technical solutions, accurate control of the protrusion amount of the angular contact ball bearing after coating treatment can be achieved, thereby improving the mating accuracy and assembly efficiency. The specific effects are as follows: 1. By measuring part data and calculating the change value of the protrusion amount in combination with the coating thickness, it is ensured that the influence brought by the coating can be accurately reserved when grinding the end face, avoiding manual trimming, and improving the production efficiency and product quality; 2. Completing the end face grinding before coating the raceway, ensuring that the protrusion amount of the bearing after coating meets the mating requirements, enabling the mated bearing to reach the designed preload when installed, reducing the friction torque and contact stress, and extending the service life of the bearing; 3. The assembly and mating steps are clear, the process is standardized, which is convenient for operation and quality control, and improves the controllability and consistency of the overall production process.

[0020] Preferably, after the steps of assembling and pairing, the steps further include: Re-measure the protrusion value of the paired bearings. If the protrusion value does not meet the standard, trim the ring.

[0021] By adopting the above technical solution, the protrusion amount of the paired bearing can be re-measured after the angular contact ball bearing is coated to ensure that it meets the standard requirements.

[0022] If the protrusion value does not meet the standard, it can be adjusted by trimming the ring to ensure the performance stability and reliability of the bearing after pairing, avoid the adverse effects of the protrusion change caused by the coating on the bearing preload, friction torque and contact stress, effectively extend the bearing service life and improve product quality.

[0023] The retest step ensures precise control of the protrusion, while trimming the ferrule provides a remedial measure so that the final mating state meets the design requirements.

[0024] Preferably, before the step of measuring the part data, the step further includes: Measuring the technical data of the assembled bearing, Disassemble the assembled bearing.

[0025] By adopting the above technical solution, the technical data of the assembled bearings is measured and the bearings are disassembled to ensure the accuracy of subsequent calculations and grinding, further improving the reliability and accuracy of the overall method.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By pre-calculating the change in the protrusion after coating and reserving the corresponding change when grinding the end face, the influence of coating treatment on the protrusion can be effectively avoided or reduced, ensuring that the final protrusion of the paired bearings meets the standard requirements; 2. The protrusion control method of angular contact ball bearings after coating can accurately quantify the effect of coating thickness on the protrusion, improve the accuracy of protrusion control, thereby avoiding preload deviation caused by protrusion changes, reducing the increase of friction torque and contact stress, and extending the service life of the bearing; 3. Through the systematic calculation and grinding process, the traditional manual grinding method is replaced, which significantly improves production efficiency and quality consistency, and solves the problems of low efficiency and unstable quality caused by manual grinding in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a pairing diagram of angular contact ball bearings.

[0028] Figure 2 It is a schematic diagram of the protrusion of an angular contact ball bearing.

[0029] Figure 3 It is a schematic diagram of the pairing of angular contact ball bearings after coating. Specific implementation mode

[0030] The following further elaborates on this application in conjunction with the attached drawings.

[0031] Generally, for the pairing of angular contact bearings, according to the indicators in GB / T32334, the outer dimension, rotation accuracy, contact angle, and protrusion amount of the bearings are screened and matched. When the corresponding indicators of the two sets of bearings meet the pairing requirements, the protrusion amount δ of the bearings will be continuously measured under the state of bearing preload, and the end face height of the inner ring or outer ring will be ground according to the measured value, so that the sum of the protrusion amounts of the two sets of bearings is 0±a (a is the tolerance required in the standard). When installing the bearings, directly press the inner ring end face (DB pairing, such as Figure 1 -a) or the outer ring end face (DF pairing, such as Figure 1 -b). After pressing, the inner and outer ring end faces fit completely, and the required preload is generated inside the bearing.

[0032] Among them, the protrusion amount δ is defined as: under the action of the axial preload of a single bearing, the distance that the inner ring end face protrudes relative to the outer ring end face within the same end face of the bearing, such as Figure 2 . It is "+" when protruding and "-" when recessed.

[0033] The embodiment of this application discloses a method for controlling the protrusion amount after coating treatment of angular contact ball bearings, including: Listing the functional relationship of the protrusion amount based on the geometric structure and calculating the original value of the protrusion amount; Taking the differential of the parameters related to the coating thickness in the functional relationship; Calculating the change value of the protrusion amount after coating; Determining the grinding value of the end face based on the original value and the change value.

[0034] Functional relationship: Among them, δ - protrusion amount, G r - radial clearance, R e - outer ring groove curvature radius, R i - inner ring groove curvature radius, D w - ball diameter, B - inner ring width, a e - outer ring groove position, a i - inner ring groove position.

[0035] Under light load conditions, the protrusion amount of angular contact ball bearings is related to the radial clearance, outer ring groove curvature radius, inner ring groove curvature radius, ball diameter, inner ring width, outer ring groove position, and inner ring groove position.

[0036] The parameters related to the coating thickness include the inner ring groove curvature radius, the outer ring groove curvature radius, and the radial clearance. Differentiate the parameters related to the coating thickness in the functional relationship:

[0037] Calculation formula for the change value of the protrusion amount after coating:

[0038] In the case where the coating thickness is t, let ΔG r =-4t, ΔR e =-t, ΔR i =-t into the calculation formula to calculate the change value of the protrusion amount after coating.

[0039] Taking the angular contact ball bearing of type 71810C paired in the DB manner as an example for calculation Radial clearance G r : 0.013 Outer ring curvature radius R e : 2.08 Inner ring curvature radius R i : 2.04 Ball diameter D w : 3.969 Inner ring width B: 6.99 Outer ring groove position a e : 3.52 Inner ring groove position a i : 3.49 Coating thickness t: 0.002 Substitute the bearing parameters into the functional relationship and calculate: δ = 0.024 Substitute the bearing parameters and the coating thickness t into the calculation formula and calculate: Δδ = -0.014.

[0040] It can be seen that: in the state before coating, the inner ring of the bearing protrudes 0.024 from the end face of the outer ring; the change value of the protrusion amount after coating is -0.014, that is, as Figure 3 , the distance between the inner ring and the end face of the outer ring decreases after coating; it is determined that 0.010 needs to be ground off from the corresponding end face of the inner ring before coating so that the protrusion amount before coating is 0.014, and the protrusion amount after coating is affected by the coating layer, making the final protrusion amount 0.

[0041] The implementation principle of the method for controlling the protrusion amount after coating treatment of an angular contact ball bearing in an embodiment of the present application is: taking the DB state as an example, grind the end face of the raceway before coating so that the sum of the protrusion amounts of the two paired bearings is 0 ± a (a is the tolerance required in the standard); as Figure 3Due to the influence of the film thickness, the protrusion of the bearing after coating will become smaller. Under the original preload, the inner ring of the bearing cannot fit. According to the installation method of the paired bearings, the inner ring end faces of the two paired bearings will be forcibly pressed by external force F. The actual preload inside the bearing will be too large, the friction torque of the bearing will increase, and the internal contact stress will also increase, which will affect the service life of the film.

[0042] This solution calculates the effect of coating treatment on the protrusion of the bearing and reserves the corresponding change value when grinding the end face, thereby avoiding or reducing the effect of the change in protrusion after coating.

[0043] The present application also discloses a method for pairing angular contact ball bearings after coating treatment, comprising: Measure the technical data of the assembled bearing: the technical data includes the inner and outer diameters, rotation accuracy, contact angle α, radial clearance G r , protrusion δ, the data correspond one to one; Disassembly of assembled bearings: Depending on the amount of ring lock, cold or hot disassembly can be selected to separate the inner and outer rings, steel balls, and cages, with the parts corresponding to each other (serial number); Measured part data: Measure the inner raceway curvature radius R i , Outer raceway curvature radius R e , steel ball diameter D w , inner ring width B, outer ring groove position a e , inner groove position a i , the data correspond one to one; The grinding value is calculated by the above control method: the measured value is substituted into the calculation formula to obtain the change value Δδ of the protrusion after coating; Grinding end face: Grind the inner or outer ring end face according to the matching type requirements (DB or DF) and the measured value of the protrusion. Combined with the influence of the film layer, the grinding amount is δ+Δδ; Channel coating: After the parts are cleaned after grinding, they are coated; Assembly and pairing: After coating, reassemble the bearing parts according to the corresponding serial numbers before disassembly; according to the pairing standards, select and pair the two sets of bearings that meet the technical requirements and record them; Re-measure the protrusion value of the paired bearings: Re-measure the protrusion value of the paired bearings, compare it with the standard requirements, and determine whether the sum of the protrusions meets 0±a (a is the tolerance required in the standard); If the protrusion value does not meet the standard, trim the ring: the corresponding ring can be slightly trimmed manually (this step can be performed according to the actual situation).

[0044] The implementation principle of the pairing method for angular contact ball bearings after coating treatment in the embodiments of this application is as follows: By measuring the part data and combining the coating thickness, the change value of the protrusion amount is calculated to ensure that the influence brought by the coating can be accurately reserved when grinding the end face, avoiding manual trimming, and improving production efficiency and product quality. The assembly and pairing steps are clear, the process is standardized, which is convenient for operation and quality control, and improves the controllability and consistency of the overall production process.

[0045] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A method for controlling the protrusion of an angular contact ball bearing after coating treatment, characterized in that: include: According to the geometric structure, the functional relationship of the protrusion is listed and the original value of the protrusion is calculated. Differentiate the parameters related to coating thickness in the functional relationship, Calculate the change in protrusion after coating. The grinding value of the end face is determined based on the original value and the change value.

2. The control method according to claim 1, characterized in that: Parameters related to coating thickness include inner ring groove curvature radius, outer ring groove curvature radius and radial clearance.

3. The control method according to claim 2, characterized in that: The functional relationship is: Among them, δ-protrusion, G r - Radial clearance, R e -Outer ring groove curvature radius, R i -Inner groove curvature radius, D w -Ball diameter, B-Inner ring width, a e - Outer groove position, a i - Inner groove position.

4. The control method according to claim 3, characterized in that: The calculation formula for the change in protrusion after coating is:

5. The control method according to claim 4, characterized in that: When the coating thickness is t, ΔG r =-4t, ΔR e =-t, ΔR i =-t.

6. A method for pairing angular contact ball bearings after coating treatment, characterized in that: include: Measure part data, Calculate the grinding value using the control method described in right 1, Grinding end face, Channel coating, Assembly and matching.

7. The pairing method according to claim 6, characterized in that: After the steps of assembly and pairing, it also includes: Re-measure the protrusion value of the paired bearings. If the protrusion value does not meet the standard, trim the ring.

8. The pairing method according to claim 6, characterized in that: Steps before measuring part data also include: Measuring the technical data of the assembled bearing, Disassemble the assembled bearing.

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