Although many types of rolling bearing, the structural type and tolerance grade, material selection, and processing method has difference, but the basic manufacturing process all include the following content:
Bearing parts manufacturing-bearing parts inspection-bearing parts, demagnetism, their cleaning, rust-bearing assembly-bearing product inspection-bearing finished product, demagnetism, their cleaning-bearing finished with oil packing measures finishing warehousing.
Contractor is the important parts of rolling bearing, because many varieties of rolling bearing, make different type bearing rings size, structure, make use of the equipment, process methods of the same. And with the processing procedures, rings process complex, processing accuracy requirement is high, and therefore, the contractor to the precision of the bearing processing quality, service life and have an important impact on performance.
The raw materials for manufacturing rings cylindrical bar stock or pipe material, at present according to different molding process, rolling bearing collar is generally has the following kinds of manufacturing process.
1) (bar stock) the material of forging-annealing (or are fire-turning (cold rolling forming)-heat treatment quenching and tempering-grinding-parts inspection-demagnetism, their cleaning-submit assembly
2) (great materials, pipe material) cold rolling material molding-heat treatment quenching and tempering-grinding-parts inspection-demagnetism, their cleaning-submit assembly
3) (tube material) material-turning molding-heat treatment quenching and tempering-grinding-parts inspection-demagnetism, their cleaning-submit assembly
4) (bar stock) material-cold (temperature) extrusion-turning-heat treatment quenching and tempering-grinding-parts inspection-demagnetism, their cleaning-submit assembly
Rings the shaping method
At present in the front-runners processing, the shaping method basically has the following kinds: 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 gm products can use stick (tube) material directly turning to shape. Since the 1980 s, our country some small and medium enterprise in the small contractor 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, improve the 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 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, improve the metal organization of dense, and 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)-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, 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, the product with high accuracy is used more and more the numerical control turning forming technology.
To sum up, the direction of forming rings should be towards metal material utilization high, high efficiency, high precision molding the direction of development. Therefore, high speed upset forging technology, cold rolling expansion technology, the numerical control turning molding technology will get more and more applications.
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