How to shape and process rolling bearing rings

Source: Bearing network time: 2017-10-01

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Although there are many types of rolling bearings; there are differences in layout type, public service level, data selection, and processing methods; however, the basic production process includes the following contents:
1, bearing parts production - bearing parts view - bearing parts demagnetization, removal, rust-proof bearing installation - bearing products view bearing products demagnetization, removal - bearing products oil packaging drum products into the warehouse.
2, the ferrule is an important part of the rolling bearing; because of the wide variety of rolling bearings; the ferrule scale, layout, equipment and process methods of different types of bearings are different, and because the ferrule processing process is numerous, the process is messy. The processing precision is high; therefore; the processing quality of the ferrule has an important influence on the accuracy, service life and function of the bearing.
3. The original data produced by the ferrule is a cylindrical bar or tube; currently the molding process is different; the rolling bearing ferrule usually has the following production processes.
1) (bar material) blanking - casting - annealing (or normalizing - turning (cold forming) - heat treatment quenching, tempering - grinding - parts view - demagnetization, removal - submit installation.
2) (bar, tube) cutting - cold head forming - heat treatment quenching, tempering - grinding - parts view - demagnetization, removal - submit installation.
3) (pipe material) blanking - turning forming - heat treatment quenching, tempering - grinding - parts view - demagnetization, cleaning - submit installation 4) (bar material) blanking - cold (warm) kneading - turning - heat treatment Quenching, tempering-grinding-Parts View-Demagnetization, Clearing-Submitting Installation Ring Forming Method:
Currently in the ferrule processing; molding methods are mainly the following: casting molding, turning molding, cold expansion molding and cold (warming) kneading. In the above molding method; casting molding processing is the most widely used; About 80% of the output; for some small general-purpose products, it is possible to use rod (tube) material for direct turning. Since the 1980s; some small and medium-sized companies in China have used cold-rolling expansion and cooling in the production of small and medium-sized ferrules. Warm) kneading process.
1) Casting and molding can eliminate the defects of metal connotation; improve metal arrangement; make metal flow line disperse reasonably; metal tightness. Casting processing technology is widely used in bearing forming process; can complete small products from inner diameter ~20mm Processing of extra large products with an outer diameter of 5000mm. Common casting methods include: hot forging, cold forging, and warm forging;
Hot forging processing is divided into: free casting process, press casting process, flat forging machine casting process and high speed upsetting machine casting process.
2) Cold heading forming cold rolling process is a kind of leading process method that can improve data utilization rate; improve metal arrangement fineness; adhere to metal flow linearity; it is a chipless processing method. Theoretically; cold heading molding The product can be directly subjected to heat treatment and grinding without turning. At present, the cold rolling process is mainly applied to medium and small deep groove ball bearings; its primary process is:
Casting blank (ring) - turning (except channel) - è¾— expansion (ditch and chamfer) full diameter - soft grinding both ends.
When the cold rolling process and the casting forming process are selected, the accuracy of the product is affected by the precision of the equipment; it is also affected by the precision of the forming die.
3) Turning molding:
In the bearing profession; the traditional turning forming skills are the use of special lathes; the assembly process is used to complete the forming process. However, because the equipment used in this method is difficult to adjust, the machine precision is low, and the data utilization rate is low; therefore, the process is being screened.
With the development of scientific skills; CNC turning machine tools are rapidly developing and increasingly perfect. Currently; some products with cluttered shapes and high precision requirements are increasingly using CNC turning forming skills.
In summary, the direction of the ferrule forming process should be directed toward the high utilization rate of metal materials, high production efficiency, and high molding precision. Therefore, high-speed upsetting skills, cold rolling skills, and numerical control turning forming skills will be obtained. More and more applications.

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