Large roller hot forging process

Abstract

The large roller hot forging process belongs to the field of roll bearing machining technology. The process includes the following technological steps: cold cutting the soft ground rod into material section and eliminating burrs, heating to 120-180 deg.c before soaking with graphite lubricant, heating in a MF induction furnace to the hot forging temperature below the metal critical point, mold forging to complete the plastic deformation forming the roller, pushing out the roller blank with one pushing mechanism, and cutting off the technological ring from the roller blank. The present invention has the features of high production efficiency, high fatigue tolerance, high impact performance, etc and is used in large roller production.

Description

technical field [0001] The invention belongs to the technical field of processing technology of rollers in roller bearings, and in particular relates to a large-size roller warm forging forming technology. Background technique [0002] In the bearing industry, small-sized rollers (including needle rollers) are generally produced by Z32 series cold heading machines for cold forming technology. Due to the limitation of equipment load, the maximum processing size is about Φ24mm. Large-sized rollers exceeding this size are generally made by lathing. craft. There are following deficiencies in the car manufacturing process: [0003] 1. Low production efficiency: Taking the lathe processing technology as an example, the shift production is 850 pieces, and the 24-hour continuous production of a lathe can only reach 2,000 pieces; [0004] 2. The mechanical properties of the roller are poor: the turning process does not change the intrinsic quality of the raw material, and many kniv...

AI Technical Summary

Problems solved by technology

[0003] 1. Low production efficiency: Taking the lathe processing technology as an example, the shift production is 850 pieces, and the 24-hour continuous production of a lathe can only reach 2,000 pieces;

[0004] 2. The mechanical properties of the roller are poor: the turning process does not change the intrinsic quality of the raw material, and many knives will be formed on the surface of the roller during turning. Therefore, the impact resistance and fatigue life of the roller cannot be fundamentally guaranteed and Improvement directly affects the service life of the bearing;

[0005] 3. Unsatisfactory process stability: Due to the long process of turning and the variety of cutting tools, if one cutting tool fails, it will produce waste or shut down for adjustment

In addition, lathe workers often use white steel knives, which have strict requirements on the linearity, size dispersion, and hardness of raw materials, and cannot feed materials if there is a slight discomfort;

[0006] 4. Low material utilization rate: the turning process requires that the raw material specification must be greater than the maximum diameter of the roller. According to the product structure and size, the excess material can be removed by turning to process a qualified roller.

Therefore, a large amount of expensive raw materials are turned into iron filings, and the material utilization rate is very low

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