At present in ring processing, import bearing the entire diameter workpiece  combination to improve the dimensional accurucy workpiece precision molding method basically has the following: forging forming, turning molding, cold forming and steady press-down dimension cold extrusion (temperature). In the above processing methods, forging forming most widely used, accounting for about 80% of the total amount, for some small commom products can use stick (tube) material directly turning to shape. Since the 1980 s, our country some small and medium enterprise in the small ring is adopted in the production of cold rolling expansion and cold extrusion technology (temperature).

1) forging molding

Through the forging process can eliminate metal internal defects, Qingdao Ruijing mechanical and electrical supply equipment imported bearing type improve special metal organizations, reasonable distribution of metal flow pattern, metal close for good. Forging forming technology is widely used in bearing forming, can complete inner diameter ~ 20 mm from small products to 5000 mm diameter of large product processing. Common forging the shaping method: hot forging processing, cold forging processing, temperature forging process, our country to hot forging primarily.

Hot forging process because of its forming equipment different and divided into: free forging process technology, press forging process, flat forging process and high speed machine upset forging machine forging process.

2) cold rolling forming

Cold rolling is a kind of can improve material utilization, bearing ultra precision machine tool of the oil-stone oscillation system has good resistance to vibration increased performance of metal compact structure, keep the metal flow linear advanced technology method, it is a kind of a chipless machining method. In theory, cold rolling forming products to turning can be directly by heat treatment and grinding machining. At present, the cold rolling mainly used in medium and small deep groove ball bearings, the main technological process for:

Forging blank (ring) reduce NSK bearing noise-the ball turning (except the channel)-a steady press-down dimension (ditch and chamfering) the whole size-RuanMo two end

By cold rolling and forging molding process, the precision of products except the influence by equipment precision, and the influence of accuracy by forming die.

3) turning molding

In bearing industry, rolling bearing in motion resistance to wear constantly because of bearing and failure of the traditional turning molding technology is using a special lathe, the focus on process method is used to complete forming. But because the method USES the equipment adjustment is difficult, machine tool low accuracy, low material utilization ratio, so the process methods are being phased out.

With the development of science and technology, the numerical control turning machine a rapid development and more perfect. At present, some complex shape, high precision pruducts are used more and more the numerical control turning forming technology.



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