Special steel material for high-strength bearing and machining process of high-strength bearing

Abstract

The invention discloses a special steel material for a high-strength bearing and a machining process of the high-strength bearing. A blank comprises the following chemical components in percentage by mass: 0.24-0.26% of C, 0.10-0.12% of Si, 0.95-0.97% of Mn, 0.45-0.47% of Ni, 6.3-6.5% of Cr, 0.26-0.28% of Mo, 0.32-0.34% of Sr, 0.08-0.10% of Nb, 0.03-0.05% of Cu, 0.17-0.19% of Al, 0.26-0.28% of Ti, not more than 0.01% of S, not more than 0.02% of P, and 0.15-0.17% of rare earth metals, the balance being Fe, wherein the rare earth metals consist of the following chemical components in percentage by mass: 3-5% of praseodymium, 11-13% of neodymium, 9-11% of promethium, 3-5% of gadolinium, 2-4% of lutecium, 6-8% of europium, 1-3% of terbium and 4-6% of holmium, the balance being erbium. The invention further discloses the machining process of the high-strength bearing; and the machining process comprises the steps of forging, annealing, tempering, turning, carburizing and heat treatment. The produced bearing has the characteristics of high machining size precision, stable inherent quality, excellent performance, long service and high reliability.

Description

technical field [0001] The invention belongs to the technical field of mechanical transmission, and relates to a bearing steel material, in particular to a special steel material for high-strength bearings and its processing technology. Background technique [0002] Bearing is an important component in contemporary mechanical equipment. It plays a role in fixing and reducing the friction coefficient of load during mechanical transmission. When other parts move relative to each other on the shaft, it is used to reduce the load during power transmission. Its main function is to support the mechanical rotating body to reduce the friction coefficient of the mechanical load of the equipment during the transmission process. [0003] At present, in my country, the production concentration of the bearing industry is low, and the R&D and innovation capabilities are low. Since most enterprises are still at a low level in the construction and operation of innovation systems, capital in...

AI Technical Summary

Problems solved by technology

[0003] At present, in my country, the production concentration of the bearing industry is low, and the R&D and innovation capabilities are low. Since most enterprises are still at a low level in the construction and operation of innovation systems, capital investment in R&D and innovation, and talent development, coupled with the The scientific research institutes serving the industry are becoming commercialized, and the country has no investment in the research of common technology in the industry, thus weakening the function of research and development for the industry

[0004] At the same time, the low level of manufacturing technology is also one of the main problems faced by my country's bearing industry. The development of my country's bearing industry manufacturing technology and process equipment technology is slow, the CNC rate of turning is low, and the level of grinding automation is low, especially for bearing life and reliability. Important advanced heat treatment processes and equipment, such as controlled atmosphere protection heating, double refinement, bainite quenching, etc., have low coverage, and many technical problems have not been solved.

The research and development of new steel types of bearing steel, the improvement of steel quality, the research and development of related technologies such as lubrication, cooling, cleaning and abrasive tools, cannot meet the requirements of improving the level and quality of bearing products

As a result, the process capability index is low, the consistency is poor, the processing size of the product is large, and the inherent quality of the product is unstable, which affects the accuracy, performance, life and reliability of the bearing.