Processing method of rolling bearing ring forming

Although there are many types of rolling bearings, there are differences in their structural types, tolerance levels, material selection, and processing methods, but their basic manufacturing process includes the following:

Bearing parts manufacturing-bearing parts inspection-bearing parts demagnetization, cleaning, rust prevention-bearing assembly-bearing finished product inspection-bearing finished product demagnetization, cleaning-bearing finished product oiled packaging bucket finished product storage.

Rings are important parts of rolling bearings. Due to the wide variety of rolling bearings, the size, structure, manufacturing equipment, and process methods of different types of bearings are different. In addition, because of the many processing procedures of the ferrule, the complexity of the process, and the high machining accuracy requirements, the processing quality of the ferrule has an important impact on the accuracy, service life and performance of the bearing.

The raw materials for ferrule manufacturing are cylindrical rod or tube materials. At present, according to different molding processes, rolling bearing ferrules generally have the following manufacturing processes.

(1) (Bar stock) blanking-forging-annealing (or normalizing-turning (cold rolling)-heat treatment quenching, tempering-grinding-part inspection-demagnetization, cleaning-submission for assembly

(2) (Bar material, tube material) blanking-cold rolling forming-heat treatment quenching, tempering-grinding-part inspection-demagnetization, cleaning-submission for assembly

(3) (Pipe material) blanking-turning forming-heat treatment quenching, tempering-grinding-part inspection-demagnetization, cleaning-submission for assembly

(4) (Bar stock) blanking-cold (warm) extrusion molding-turning-heat treatment quenching, tempering-grinding-part inspection-demagnetization, cleaning-submission for assembly

Forming method of ferrule

Currently, in the processing of ferrules, the main forming methods are as follows: forging forming, turning forming, cold rolling and expanding forming and cold (warm) extrusion forming. Among the above forming methods, forging forming is the most widely used, accounting for about 80% of the total production. For some small general-purpose products, rods (tubes) can be directly turned into forming. Since the 1980s, some small and medium-sized enterprises in my country have adopted cold rolling and expansion and cold (warm) extrusion molding processes in the production of small and medium-sized ferrules. (Guide: Introduction to the use of thread processing machine tools)

(1) Forging molding

The forging process can eliminate the inherent defects of the metal, improve the metal structure, make the metal streamline distribution reasonable, and the metal tightness is good. Forging forming processing technology is widely used in bearing forming processing, and can complete the processing of small products with an inner diameter of ~20mm to large products with an outer diameter of 5000mm. Common forging forming methods are: hot forging, cold forging, and warm forging. Hot forging is the main form in my country.

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

(2) Cold rolling forming

The cold rolling process is an advanced process method that can increase the utilization rate of materials, improve the compactness of the metal structure, and maintain the linearity of the metal flow. It is a chip-free processing method. In theory, cold-rolled products can be directly processed for heat treatment and grinding without turning. At present, the cold rolling process is mainly used in medium and small deep groove ball bearings. The main process is:

Forging blank (annular)-turning (except for grooves)-rolling (groove and chamfering) diameter adjustment-soft grinding of both ends

When using the cold rolling process and forging forming process, the accuracy of the product is not only affected by the accuracy of the equipment, but also by the accuracy of the forming die.

(3) Turning forming

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

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

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