Bearing steel pipe inspection quality control method for cold rolling and expanding bearing
A bearing steel pipe and bearing technology, applied in the field of bearing steel pipe manufacturing, can solve the problems of unstable bearing quality and service life, uneven structure, multi-surface cracks, etc., to improve bearing quality and service life, high structure uniformity, and reduce waste products The effect of defect rate
Pending Publication Date: 2021-07-09
JIANGXI HONGRUIMA STEEL PIPE
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Problems solved by technology
[0014]
However, in the actual production and shipment process, the inspection is carried out according to this standard. The bearing steel pipes that meet the inspection standard still sometimes produce a lot of surface cracks in the process of cold rolling and expanding the bearings, and the problem of uneven organization occurs, resulting in bearing failure. Dimensional dispersion occurs during fine grinding, resulting in unstable bearing quality and life
The cause and solution of this problem has not yet been found
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[0023] Among the various factors affecting the quality of bearing products, surface cracks and uneven structure are one of the important forms of bearing failure, which are irreparable defects and should be avoided in the production process. However, according to the current bearing steel pipe inspection standard YBT4146-2016, the bearing steel pipes that meet the standards will still have such problems when they are cold rolled and expanded to produce bearings. The applicant explored the cause of the problem and believed that it was related to the inspection standard. In this regard, the applicant further studied the quality control method of bearing steel pipe inspection on the basis of the current standards, in order to find a new quality control method of bearing steel pipe inspection to solve this problem.
[0024] The applicant conducted a failure analysis on the surface cracked bearings produced by cold rolling, and found no decarburization in the metallographic inspect...
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Abstract
The invention discloses a bearing steel pipe inspection quality control method for a cold rolling and expanding bearing. In the production process of a bearing steel pipe, pipe blank factory inspection, spheroidizing annealing state capillary pipe inspection and stress relief annealing state finished pipe inspection are sequentially carried out; stress relief annealing state finished pipe inspection includes hardness inspection, microscopic structure inspection, carbide non-uniformity inspection and decarburized layer inspection; during hardness inspection, the Brinell hardness is 179-190 HBW, and the grade is 2-3 according to the fifth grade diagram evaluation in the appendix A of GB / T 18254-2016 during microscopic structure inspection. The bearing steel pipe is subjected to quality control through the method, the surface of the bearing produced through cold rolling and expansion is free of cracks, the structure uniformity is high, thus the quality of the bearing is improved, and the service life of the bearing is prolonged.
Description
technical field [0001] The invention belongs to the technical field of bearing steel pipe manufacturing, and in particular relates to a method for quality control of bearing steel pipes used for cold rolling bearings. Background technique [0002] The current inspection standards for bearing steel pipes are inspected in accordance with the metallurgical industry standard high-carbon chromium bearing steel seamless steel pipe YBT4146-2016, and some of them are expressed as follows: [0003] 1. Hardness: The Brinell hardness of the hot-rolled steel pipe delivered in the state of spheroidizing annealing should be 179-217HBW. [0004] The cold-drawn (rolled) steel pipe delivered in the annealed state should have a Brinell hardness of 179-220HBW, the difference between the Brinell hardness values of the same batch of steel pipes should not exceed 15HBW, and the difference between the Brinell hardness values of the same section of steel pipes should not exceed 10HBW. [0005]...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C21D1/28C21D8/10C21D9/08G01N33/20
CPCC21D1/28C21D9/08C21D8/105G01N33/20
Inventor 刘佳宁徐方琴王正德胡云龙祝仕奇
Owner JIANGXI HONGRUIMA STEEL PIPE