Method for suppressing machining deformation of thin-wall bearing outer ring

Abstract

This invention discloses a method for suppressing deformation during the machining of the outer ring of a thin-walled bearing, comprising the following steps: setting experimental values ​​for three machining parameters: workpiece rotation speed, grinding wheel rotation speed, and feed rate; grinding the bearing outer ring; detecting deformation, surface quality, and machining efficiency of the bearing outer ring; determining the machining experimental parameters for suppressing deformation; establishing a machining experimental parameter database; and retrieving the machining experimental parameters from the database according to machining requirements. This invention suppresses deformation caused by grinding the outer ring of a thin-walled bearing from the perspective of grinding experimental parameters. The method is simple and efficient. While suppressing deformation, this invention considers the influence of grinding on the surface roughness of the bearing outer ring, ensuring that the ground thin-walled bearing outer ring meets production standard requirements. This invention establishes a machining experimental parameter database for the outer ring of an NCF1856V.01 type thin-walled bearing, and the machining experimental parameters can be extracted according to requirements, which is convenient and quick.

Description

Technical Field

[0001] This invention belongs to the field of bearing manufacturing, specifically a method for suppressing deformation during the machining of the outer ring of a thin-walled bearing. Background Technology

[0002] Thin-walled bearings are widely used in harmonic reducers due to their high precision, lightweight, low noise, and strong load-bearing capacity. The bearing outer ring, as a key component, significantly impacts the overall performance and service life of the bearing. Grinding is the most crucial machining step in the outer ring manufacturing process; its quality greatly affects subsequent processing and the overall bearing performance. Because of their small outer ring thickness, thin-walled bearings are prone to deformation during grinding, affecting subsequent production processes. Furthermore, severely deformed outer rings are directly classified as scrap, impacting production efficiency. Therefore, controlling the deformation of thin-walled bearing outer rings is a pressing issue that needs to be addressed during manufacturing.

[0003] Existing methods for addressing deformation of thin-walled bearing outer rings primarily involve intervention during the heat treatment process. Patent CN109593948A discloses a heat treatment method to reduce grinding deformation of GCr15 steel bearing outer rings. This method involves hot and cold cleaning of the quenched martensite to further transform the retained austenite in the quenched structure, increasing dimensional stability. Low-temperature tempering after cold cleaning reduces the structural stress generated during quenching, thereby reducing bearing outer ring deformation. However, this method suppresses deformation during the heat treatment stage and cannot address deformation generated during subsequent grinding. Patent CN101328531A discloses a method to address grinding deformation of bearing outer rings. This method controls the carbon potential of the protective or controlled atmosphere to 0.6%-1.1% through heating and holding processes, followed by quenching and tempering. This prevents the formation of a decarburized layer on the bearing outer ring surface, achieving uniform surface compressive stress and thus suppressing deformation. This method also suppresses deformation during the heat treatment stage but cannot address deformation generated during subsequent grinding.

[0004] Furthermore, patent CN 112192322 A discloses a deformation-resistant grinding process for bearing outer rings. This process includes preheating treatment, rough grinding, primary heat treatment, fine grinding, secondary heat treatment, cleaning, and polishing. Multiple heat treatments fully release processing stress, reducing bearing outer ring deformation. This process can reduce deformation during bearing outer ring grinding to a certain extent, but it is relatively cumbersome and has low processing efficiency. In addition, a research paper by Zhu Xinbo et al. proposed an improved method for machining the inner and outer diameter surfaces of thin-walled bearing outer rings. This method reduces machining deformation by adding rough machining of the blank before profile machining, adding a stress-relieving process after profile machining, and changing the clamping method. However, this method involves more steps, resulting in high production costs and low efficiency.

[0005] Existing methods for suppressing outer ring deformation mostly focus on the heat treatment process, and these methods are relatively cumbersome and costly. Currently, there is no effective method to suppress deformation during the outer ring grinding process. Summary of the Invention

[0006] To address the existing technical problems, this invention focuses on the machining process in bearing manufacturing, aiming to propose a method for suppressing deformation during the machining of the outer ring of a thin-walled bearing.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A method for suppressing machining deformation of the outer ring of a thin-walled bearing includes the following steps:

[0009] A. Setting processing experiment parameters

[0010] Experimental values ​​were set for three machining parameters: workpiece speed, grinding wheel speed, and feed rate.

[0011] During the grinding experiments, while ensuring the service life of the grinding wheel and operational safety, the maximum and minimum values ​​of the machining experimental parameters were selected, with intermediate values ​​set at even intervals. The workpiece rotation speed was designed to be 45, 55, and 65 r / min; the grinding wheel rotation speed was designed to be 1500, 2000, and 3000 r / min; and the grinding wheel feed rate was designed to be 0.07, 0.10, and 0.14 mm / min. Experiments were conducted on different data for these three machining experimental parameters, resulting in a total of 9 machining experiments. The designed removal amount was 0.19 mm. The experimental parameters for each group are as follows:

[0012] Focus on the workpiece rotation speed group 1: workpiece rotation speed 45 r / min, grinding wheel rotation speed 2000 r / min, feed rate 0.07 mm;

[0013] Two sets of workpiece rotation speeds are monitored: workpiece rotation speed 55 r / min, grinding wheel rotation speed 2000 r / min, and feed rate 0.07 mm.

[0014] Three sets of workpiece rotation speeds were monitored: workpiece rotation speed 65 r / min, grinding wheel rotation speed 2000 r / min, and feed rate 0.07 mm.

[0015] Focus on the following grinding wheel speed settings: workpiece speed 55 r / min, grinding wheel speed 1500 r / min, feed rate 0.07 mm;

[0016] Two sets of grinding wheel speeds are monitored: workpiece speed 55 r / min, grinding wheel speed 2000 r / min, and feed rate 0.07 mm.

[0017] Monitor three sets of grinding wheel speeds: workpiece speed 55 r / min, grinding wheel speed 3000 r / min, and feed rate 0.07 mm.

[0018] Focus on feed rate group 1: workpiece rotation speed 55 r / min, grinding wheel rotation speed 2000 r / min, feed rate 0.07 mm;

[0019] Focus on two sets of feed rates: workpiece speed 55 r / min, grinding wheel speed 2000 r / min, feed rate 0.10 mm;

[0020] Pay attention to the three sets of feed rates: workpiece speed 55 r / min, grinding wheel speed 2000 r / min, and feed rate 0.14 mm;

[0021] B. Grinding the outer ring of the bearing.

[0022] Before grinding, the initial ellipticity of the bearing outer ring of each test piece was detected and recorded; the bearing outer ring was ground according to the 9 sets of experimental parameters determined in step A.

[0023] C. Inspect the outer ring of the bearing.

[0024] The outer rings of bearings after grinding were tested according to different group processing experimental parameters. The testing included the following steps:

[0025] C1. Deformation detection: Detect and record the ellipticity of the outer ring of each bearing in the test piece;

[0026] C2. Surface quality inspection: The roughness of the machined parts on the inner surface of the outer ring of each bearing is measured.

[0027] C3. Processing efficiency test: Record the time taken from the start of grinding to the entire grinding process.

[0028] D. Determine the experimental parameters for suppressing deformation processing.

[0029] The machining experimental parameter set for the test piece with an outer ring ellipticity of less than 0.026 mm was used as the machining experimental parameter set to meet the requirement of suppressing machining deformation. Through experiments, a total of 5 sets of machining experimental parameters met the requirement of suppressing machining deformation: 2 sets focusing on workpiece speed, 3 sets focusing on workpiece speed, 2 sets focusing on grinding wheel speed, 1 set focusing on feed rate, and 2 sets focusing on feed rate.

[0030] E. Establish a database of processing experimental parameters

[0031] Based on the five sets of machining experimental parameters determined in step D that meet the requirements for suppressing machining deformation, a machining experimental parameter database is established. The grinding machining experimental parameters are correlated with machining deformation, machining quality, and machining efficiency. Subsequently, the database machining experimental parameters are retrieved according to machining requirements, which are: minimum deformation; highest machining efficiency; and best surface quality.

[0032] Furthermore, the optimal machining experimental parameters determined in step D to meet the requirements of machining deformation suppression are: workpiece rotation speed: 55 r / min; grinding wheel rotation speed: 2000 r / min; feed rate: 0.10 mm / min.

[0033] Compared with existing technologies and equipment, the beneficial effects of the present invention are:

[0034] 1. This invention suppresses deformation caused by grinding of thin-walled bearing outer rings from the perspective of grinding process experimental parameters. The method is simple and highly efficient.

[0035] 2. While suppressing deformation, this invention also considers the impact of grinding on the surface roughness of the bearing outer ring, ensuring that the thin-walled bearing outer ring after grinding meets the production standard requirements.

[0036] 3. A database of experimental parameters for machining the outer ring of NCF1856V.01 thin-walled bearings was established, allowing for convenient and quick extraction of machining experimental parameters according to requirements.

[0037] 4. Although this invention is a deformation suppression method proposed for the outer ring of NCF1856V.01 type thin-walled bearing, it can serve as a reference for the deformation suppression of the outer ring of other types of thin-walled bearings. Attached Figure Description

[0038] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0039] To further understand the method for suppressing deformation during machining of the outer ring of the NCF1856V.01 thin-walled bearing, the present invention will be described in detail below.

[0040] To ensure the outer ring of the NCF1856V.01 thin-walled bearing requires minimal deformation during machining, first follow... Figure 1 The process shown establishes a database of processing experimental parameters, and then retrieves data from the database of processing experimental parameters according to processing requirements.

[0041] The data in the established processing experiment parameter database are shown in Table 1:

[0042] Table 1. Database of Experimental Parameters for Machining Outer Ring of NCF1856V.01 Type Thin-Walled Bearing

[0043]

[0044] This invention is not limited to this embodiment. Any equivalent concept or modification within the technical scope disclosed in this invention shall be included within the protection scope of this invention.

Claims

1. A method for suppressing deformation during the machining of the outer ring of a thin-walled bearing, characterized in that: Includes the following steps: A. Setting processing experiment parameters Experimental values ​​were set for the three machining parameters: workpiece speed, grinding wheel speed, and feed rate. During the grinding experiment, while ensuring the service life of the grinding wheel and operational safety, the maximum and minimum values ​​of the machining experimental parameters were selected, and intermediate values ​​were set at even intervals. The workpiece rotation speed was designed to be 45, 55, and 65 r / min; the grinding wheel rotation speed was designed to be 1500, 2000, and 3000 r / min; and the grinding wheel feed rate was designed to be 0.07, 0.10, and 0.14 mm / min. Experiments were conducted on different data for these three machining experimental parameters, resulting in a total of 9 machining experiments. The designed removal amount was 0.19 mm. The experimental parameters for each group are as follows: Focus on the workpiece rotation speed group 1: workpiece rotation speed 45 r / min, grinding wheel rotation speed 2000 r / min, feed rate 0.07 mm; Two sets of workpiece rotation speeds are monitored: workpiece rotation speed 55 r / min, grinding wheel rotation speed 2000 r / min, and feed rate 0.07 mm. Three sets of workpiece rotation speeds were monitored: workpiece rotation speed 65 r / min, grinding wheel rotation speed 2000 r / min, and feed rate 0.07 mm. Focus on the following grinding wheel speed settings: workpiece speed 55 r / min, grinding wheel speed 1500 r / min, feed rate 0.07 mm; Two sets of grinding wheel speeds are monitored: workpiece speed 55 r / min, grinding wheel speed 2000 r / min, and feed rate 0.07 mm. Three sets of grinding wheel speeds were monitored: workpiece speed 55 r / min, grinding wheel speed 3000 r / min, and feed rate 0.07 mm. Focus on feed rate group 1: workpiece rotation speed 55 r / min, grinding wheel rotation speed 2000 r / min, feed rate 0.07 mm; Focus on two sets of feed rates: workpiece speed 55 r / min, grinding wheel speed 2000 r / min, feed rate 0.10 mm; Focus on three sets of feed rates: workpiece speed 55 r / min, grinding wheel speed 2000 r / min, and feed rate 0.14 mm; B. Grinding the outer ring of the bearing. Before grinding, the initial ellipticity of the bearing outer ring of each test piece was detected and recorded; the bearing outer ring was ground according to the 9 sets of experimental parameters determined in step A. C. Inspect the outer ring of the bearing. The outer rings of bearings after grinding were tested according to different group processing experimental parameters. The testing included the following steps: C1. Deformation detection: Detect and record the ellipticity of the outer ring of each bearing in the test piece; C2. Surface quality inspection: The roughness of the machined parts on the inner surface of the outer ring of each bearing is measured. C3. Processing efficiency test: Record the time taken from the start of grinding to the entire grinding process; D. Determine the experimental parameters for suppressing deformation processing. The machining test parameter set for the test piece with an outer ring ellipticity of less than 0.026 mm was used as the machining test parameter set to meet the requirements for suppressing machining deformation. Through the experiment, a total of 5 sets of machining test parameters met the requirements for suppressing machining deformation, namely, 2 sets focusing on workpiece speed, 3 sets focusing on workpiece speed, 2 sets focusing on grinding wheel speed, 1 set focusing on feed rate, and 2 sets focusing on feed rate. E. Establish a database of processing experimental parameters Based on the five sets of processing experimental parameters determined in step D that meet the requirements for suppressing deformation during processing, a processing experimental parameter database is established; the grinding processing experimental parameters are correlated with the amount of processing deformation, processing quality, and processing efficiency; subsequently, the processing experimental parameters in the database are called according to the processing requirements, which are: minimum deformation; highest processing efficiency; and best surface quality.

2. The method for suppressing deformation during machining of the outer ring of a thin-walled bearing according to claim 1, characterized in that: The optimal machining experimental parameters determined in step D to meet the requirements of machining deformation suppression are: workpiece rotation speed: 55 r / min; grinding wheel rotation speed: 2000 r / min; feed rate: 0.10 mm / min.

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