Forging process method for 8Cr4Mo4V steel bearing ring
A process method and technology of bearing rings, applied in the direction of manufacturing tools, bearing components, shafts and bearings, etc., can solve the major quality problems of bearing engine parking, oxidation and corrosion of main shaft bearing raceway working surfaces, cracking and spalling, etc. Technical difficulties in early corrosion and oxidation cracking failure, improving carbide distribution and morphology, and improving the effect of metal streamline distribution
Inactive Publication Date: 2021-04-30
辽宁银捷装备科技股份有限公司
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Problems solved by technology
[0006] One of the engine failure problems is mainly manifested in the oxidation corrosion, cracking and peeling of the raceway working surface of the main shaft bearing, and the early failure of the bearing leads to major quality problems of engine shutdown
Through the study of the faulty engine, it was found that, in addition to other faults, it was mainly caused by the premature failure of the main shaft bearing. An anatomical analysis of the faulty bearing found that early oxidation and corrosion appeared on the raceway working surface of the bearing, and on the cracked raceway surface There are irregular and different carbides in the lower part, and the uniform distribution along the direction of the raceway is not realized according to the design requ
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[0028]The present invention will be further described below with reference to the accompanying drawings:
[0029]Material selection domestic high-purity 8CR4MO4V high temperature bearing steel according to the expected plan for process test and inspection.
[0030]First, the preheating temperature of the blanket is 300 ° C, rolling wheel, mandrel, hammer, wheel, and other ancillary tool preheating temperatures 150-300 ° C, and the whole process is 150-300 ° C in the production process.
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Abstract
The invention discloses a forging process method for an 8Cr4Mo4V steel bearing ring. The forging process method comprises the steps of preheating, heating, blank making, ring rolling, annealing and detecting. By inspecting forge pieces and machined products, the grain size of the quenched products reaches 8.5 level (larger than or equal to 7 level), the mixed crystal phenomenon is avoided, metal streamlines are straight lines, strengthening phase carbides are evenly distributed and consistent with the direction of a roller path, the products are all qualified through water immersion ultrasonic flaw detection 0.4+16.5db-0.4+18db, and the hardness of the annealed forge pieces is 212-228HB. The expected requirements of the products in the technical aspect and the use aspect can be met, the service life of the bearing is greatly prolonged, and the cruising ability of the engine is greatly improved and can reach more than 1000 hours at most.
Description
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