A kind of cold forging bearing blank production process

Abstract

The invention discloses a production process of a cold forging bearing blank, which relates to a production process of a bearing blank. Its process flow is: steel heating→hot blanking→shaping→grinding both ends→inside and outside angle chamfering→pickling→phosphating→saponification→pre-extrusion inspection→cold extrusion molding→turning process→outer end burrs →Inspection→Transfer to quenching→Transfer to grinding process. Its advantages are less steel and energy consumption, small processing allowance, low scrap rate, less conversion of processing sites, low transportation cost, and the cost before turning grinding is 1.46 yuan / piece. Under the condition of 6 million tons of bearing steel consumption, 1.8 million tons of high-quality bearing steel is saved for the country every year, because the number of heaters and heating temperature are reduced, and coal consumption can be reduced by one-third to 50%.

Description

Technical field: [0001] The invention relates to a production process of a bearing blank, in particular to a production process of a cold forging bearing blank. Background technique: [0002] The blanks of the existing inner and outer rings of tapered roller bearings are all made by hot-rolling process 40 years ago. Round→rough turning forming→turning to grinding process→soft grinding outer circle→turning back to turning process→turning raceway→inspecting→turning to quenching→turning to grinding process. Although this production process is mature and the equipment is relatively simple, it consumes steel With more energy, large processing allowance and high waste rate, there are many conversions of processing sites and high transportation costs. The cost before being transferred to grinding is 2.69 yuan / piece. For example: after processing a 355g blank into a product, only 145g is left, and the material utilization rate is lower than 46%. Hot punching, blanking, hot punching...

AI Technical Summary

Problems solved by technology

[0003] In addition, due to the rough processing of thermal reaming, the remaining machining allowance is as much as 2 to 3 mm, which causes waste of manpower and material resources in the post-processing process; taking the processing of 10 million blanks as an example, 20 lathes and 40 workers are required, which is in line with the international level. In comparison, it has fallen far behind the bearing factory's emphasis on the rough machining of bearing blanks is far less than that on the finishing of bearings, and because most of the blanks are processed by rural cooperative factories, it has become a blind spot in the bearing industry

The technology of rural factories is relatively backward, the equipment is simple, the technical personnel are few and the level is limited, and the technical requirements required to switch to the new process are high, the mold design and manufacturing are difficult, the equipment presses have high precision, large specifications, and large investment, resulting in long-term problems. exist