Ferrule forming method for rolling bearing manufacturing

At present, in the ferrule processing, the molding methods mainly include the following types: forging type, turning forming, cold boring expansion molding, and cold (warming) extrusion molding. Among the above molding methods, forging type processing is the most widely used, accounting for about 80% of the total production volume. For some small general-purpose products, rod (tube) material can be directly turned and formed. Since the 1980s, some small and medium-sized enterprises in China have adopted cold rolling and cold (warm) extrusion molding processes in the production of small and medium ferrules.

First, cold forming

The cold rolling process is an advanced process method that can improve the material utilization rate, improve the compactness of the metal structure, and maintain the linearity of the metal flow. It is a chipless processing method. In theory, cold-formed products can be directly heat treated and ground without turning. At present, the cold rolling process is mainly applied to medium and small deep groove ball bearings. The main process is:

Forged blank (ring) - turning (except channel) -  expansion (ditch and chamfer) full diameter - soft grinding end faces

When using the cold boring process and the forging process, the accuracy of the product is affected by the accuracy of the machine, and the accuracy of the forming die.

Second, forging type

Through forging processing can eliminate metal internal defects, improve metal structure, make metal flow line distribution reasonable, and metal tightness. The forging-type processing technology is widely used in bearing forming processing, and can process from small products with an inner diameter of ~20mm to extra large products with an outer diameter of 5000mm. Common forging methods are: hot forging, cold forging, warm forging, and hot forging in China.

Hot forging processing is divided into: free forging processing technology, press forging process, flat forging machine forging process and high speed upsetting machine forging process due to different molding processing equipment.

Third, turning molding

In the bearing industry, the traditional turning technology uses a special lathe to complete the forming process using a centralized process. However, due to the difficulty in adjusting the equipment used in this method, the low precision of the machine tool and the low material utilization rate, the process is being eliminated.

With the development of science and technology, CNC turning machine tools have developed rapidly and become more and more perfect. At present, some products with complex shapes and high precision requirements are increasingly using CNC turning technology.

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