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A technology of roller processing and carburizing bearings, which is applied in the field of bearing processing, can solve problems such as high carburizing process, coarse grains, and complicated process, and achieve the effects of optimizing comprehensive performance, high contact fatigue life, and high relative purity
Inactive Publication Date: 2017-02-22
安徽千禧精密轴承制造有限公司
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Problems solved by technology
However, in order to obtain a good surface carburizing effect, the requirements for the carburizing process are relatively high, and the process is complicated
Bearing steel needs to be kept at high temperature for a long time during the surface carburizing process, which is likely to cause defects such as coarse grains
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[0014] A kind of carburizing bearing roller processing technology, comprises the following steps:
[0015] c. Forging: The weight percentage of the chemical composition in the forging embryo is: C: 0.95-1.05, N: 0.5-1.2, Mn: 0.3, Ni0.2-0.3, Si: 0.15-0.35, S: B; = 0.020, P : B; = 0.027, Cr: 1.30-1.65, heated to 600-700°C, forged, then heated to 600-800°C, kept for 5-7 hours, cooled to 300°C at 22°C / hour, and then cooled at 20°C / hour, cooled to normal temperature; b, finishing car:
[0016] Forging the blank to the size, leaving a margin of 0.1mm on the outer circle, and using a vibrating head to process the surface of the workpiece to Ra0.4;
[0017] c. The obtained bearing steel is subjected to quenching at 900°C and secondary tempering at 170°C by carburizing heat treatment;
[0018] d. Centerless grinding:
[0019] Grind the product to the required size, the finish is below R0.1, and pack the parts.
[0020] The carburized bearing roller steel obtained by the present i...
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Abstract
The invention discloses a carburized bearing roller processing technology. The technology comprises the steps that forging is carried out, chemical components in a forged blank comprise, by weight percentage, 0.95-1.05% of C, 0.5-1.2% of N, 0.3% of Mn, 0.2-0.3% of Ni, 0.15-0.35% of Si, 0.020% of S:B, 0.027% of P:B and 1.30-1.65% of Cr, the forged blank is heated to 600 DEG C-700 DEG C, forging is carried out, then heating is carried out to 600 DEG C-800 DEG C, heat is preserved for 5-7 hours, cooling is carried out at the speed of 22 DEG C per hour to 300 DEG C, and then cooling is carried out to normal temperature at the speed of 20 DEG C per hour. According to the technology, the relative purity of carburized bearing roller steel is high, the contact fatigue life is long, and while the content of microelements has the function of optimizing comprehensive performance of the carburized bearing roller steel, the influence on the purity of the carburized bearing roller steel is avoided; and the obtained carburized bearing roller steel has good comprehensive mechanical performance, hardness, strength, extensibility, the shrinkage degree and the like of the carburized bearing roller steel are better than those of common bearing steel, and the carburized bearing roller steel is suitable for being widely applied to poor working conditions such as heavy loads, impact resistance and high pressure and important parts.
Description
technical field [0001] The invention relates to the technical field of bearing processing, in particular to a carburizing bearing roller processing technology. Background technique [0002] Bearing steel is an important supporting part of various mechanical parts. Due to its wide application and importance in the application process, bearing steel has relatively high performance requirements, especially in terms of chemical composition, dimensional accuracy, purity, and surface defects. The uniformity of carbides, etc. [0003] Nitriding and carburizing treatment of bearing steel can improve its comprehensive mechanical properties. Especially the carburized bearing roller steel obtained by carburizing has higher surface hardness, better wear resistance, higher fatigue resistance, and good dimensional stability. However, in order to obtain a good surface carburizing effect, the requirements for the carburizing process are relatively high, and the process is complicated. Be...
Claims
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