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Production and processing of ferrules in rolling bearings
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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:
Bearing parts production-bearing parts view-bearing parts demagnetization, cleaning, anti-rust bearing installation-bearing products view bearing products demagnetization, cleaning-bearing products oil-coated packaging products into the warehouse.
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. Because of the many processing steps of the ferrule, the process is messy, and the processing The precision requirement is high; therefore; the processing quality of the ferrule has an important influence on the accuracy, service life and function of the bearing.
The original material 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, removal - submit installation
4) (bar material) blanking-cold (warm) kneading-turning-heat treatment quenching, tempering-grinding-parts view-demagnetization, removal-submitting installation ring forming method currently in ferrule processing; forming method First and foremost: casting, turning, cold heading and cold (warming) kneading. In the above molding method; casting molding processing is the most widely used; accounting for about 80% of the total output; General-purpose products can be directly cast from rods (tubes). Since the 1980s, some small and medium-sized companies in China have used cold-rolling and cold (warming) kneading processes in the production of small and medium-sized ferrules.
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 chamfering) full diameter-softening mill end face adopts cold rolling process and casting forming process; the accuracy of product is affected by equipment precision; Affected by the accuracy of the forming mold.
3) Turning is formed in the bearing profession; the traditional turning forming skill is to use a special lathe; the assembly process is used to complete the forming process. However, because the equipment used in this method is difficult to adjust, the machine tool has low precision, and the data utilization rate is low; 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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