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

A processing technology, high-strength technology, applied in the direction of metal material coating technology, coating, solid diffusion coating, etc., can solve the problems affecting bearings, low R&D and innovation ability, low production concentration, etc., to improve impact toughness. degree, the effect of reducing segregation

Active Publication Date: 2014-12-17
南京创贝高速传动机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a special steel for high-strength bearings, the mass percent of the chemical composition of the blank is: C: 0.24%, Si: 0.10%, Mn: 0.95%, Ni: 0.45%, Cr: 6.3%, Mo: 0.26%, Sr: 0.32%, Nb: 0.08%, Cu: 0.03%, Al: 0.17%, Ti: 0.26%, S: 0.01%, P: 0.02%, rare earth metal: 0.15%, and the balance is Fe;

[0051] Among them, the chemical composition mass percentage of rare earth metals is: praseodymium: 3%, neodymium: 11%, promethium: 9%, gadolinium: 3%, lutetium: 2%, europium: 6%, terbium: 1%, holmium: 4% , the balance being erbium.

[0052] This embodiment also provides a high-strength bearing processing technology, including forging, annealing, tempering, turning, carburizing and heat treatment:

[0053] Forging process: keep the workpiece blank at 870°C, and carry out free forging for 15 minutes;

[0054] Annealing process: After hot forging, keep warm at 745°C for 18 minutes, then cool to 205°C in the furnace, keep warm for 11 minutes, and finally coo...

Embodiment 2

[0060] This embodiment provides a special steel for high-strength bearings, the mass percent of the chemical composition of the blank is: C: 0.26%, Si: 0.12%, Mn: 0.97%, Ni: 0.47%, Cr: 6.5%, Mo: 0.28%, Sr: 0.34%, Nb: 0.10%, Cu: 0.05%, Al: 0.19%, Ti: 0.28%, S: 0.008%, P: 0.015%, rare earth metal: 0.17%, and the balance is Fe;

[0061] Among them, the chemical composition mass percentage of rare earth metals is: praseodymium: 5%, neodymium: 13%, promethium: 11%, gadolinium: 5%, lutetium: 4%, europium: 8%, terbium: 3%, holmium: 6% , the balance being erbium.

[0062] This embodiment also provides a high-strength bearing processing technology, including forging, annealing, tempering, turning, carburizing and heat treatment:

[0063] Forging process: keep the workpiece blank at 890°C, and perform free forging for 13 minutes;

[0064] Annealing process: After hot forging, keep warm at 755°C for 16 minutes, then cool to 215°C in the furnace, keep warm for 9 minutes, and finally coo...

Embodiment 3

[0070] This embodiment provides a special steel for high-strength bearings. The mass percent of the chemical composition of the blank is: C: 0.25%, Si: 0.11%, Mn: 0.96%, Ni: 0.46%, Cr: 6.4%, Mo: 0.27%, Sr: 0.33%, Nb: 0.09%, Cu: 0.04%, Al: 0.18%, Ti: 0.27%, S: 0.009%, P: 0.018%, rare earth metal: 0.16%, and the balance is Fe;

[0071] Among them, the chemical composition mass percentage of rare earth metals is: praseodymium: 4%, neodymium: 12%, promethium: 10%, gadolinium: 4%, lutetium: 3%, europium: 7%, terbium: 2%, holmium: 5% , the balance being erbium.

[0072] This embodiment also provides a high-strength bearing processing technology, including forging, annealing, tempering, turning, carburizing and heat treatment:

[0073] Forging process: keep the workpiece blank at 880°C for free forging for 14 minutes;

[0074] Annealing process: After hot forging, keep warm at 750°C for 17 minutes, then cool to 210°C in the furnace, keep warm for 10 minutes, and finally cool to roo...

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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...

Claims

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Application Information

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IPC IPC(8): C23F17/00C22C38/50C21D8/00C23C8/22
Inventor 陆树根杨忠喜冯强龙
Owner 南京创贝高速传动机械有限公司
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