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Although many types of rolling bearing, the structure type and tolerance grade differences, material selection, processing method, but the basic manufacturing process are include the following contents:
Bearing parts manufacturing - bearing parts inspection - bearing parts demagnetization, cleaning, rust, bearing assembly - bearing product inspection, bearing the finished demagnetization, cleaning - bearing product packaging oil pipe finishing warehousing.
Ring is one of the important parts, rolling bearing due to the wide variety of rolling bearing, made of different types of bearing ring size, structure, manufacturing equipment, process method, etc. Each are not identical. And because ring machining processes, process more complex, high machining accuracy, therefore, the precision of the processing quality of bearing ring, have great effect on the service life and performance.
Ring made of raw materials for cylindrical bar stock or tube material, depending on the molding process, the rolling bearing ring generally has the following several kinds of manufacturing process.
1) and (bar) material - forging, annealing (or normalizing - turning (cold roll forming) - heat treatment quenching and tempering, grinding - check - demagnetization, cleaning - submit assembly parts
2), (bar, pipe material) blanking - molding - quenching and tempering heat treatment of cold rolling grinding - check - demagnetization, cleaning - submit assembly parts
3) and (tube) blanking - cutting molding - heat treatment quenching and tempering - grinding - check - demagnetization, cleaning - submit assembly parts
4) and (bar) material - cold (warm) extrusion - turning - heat treatment quenching and tempering - grinding - check - demagnetization, cleaning - submit assembly parts
Ring forming method
Currently in ring processing, molding method basically has the following kinds: forging forming, cutting forming, cold rolling forming and cold extrusion (temperature). In the above molding method, forging forming most widely used, accounting for about 80% of the total output, for some small gm products can use bar (tube), directly cutting shape. Since the 1980 s, some small and medium-sized enterprises in China is adopted in the production of small and medium sized ring, the cold rolling and cold extrusion molding process (temperature).
1), forging forming
By forging processing, metal internal defects may be eliminated to improve metal organization, make the metal flow distribution is reasonable, good metal tightness. Forging forming process is widely used in bearing processing, can be done from ~ 20 mm inner diameter small products to outside diameter of 5000 mm oversize product processing. Common forging forming method are: hot forging, cold forging, machining, warm forging processing, mainly on hot forging in our country.
Hot forging processing because of its different forming equipment is divided into: free forging process, the press forging process and forging machine forging process and high-speed upset forging process.
2), cold rolling forming
Cold ring rolling technology is a kind of can improve material utilization, improve the metal tissue compactness, maintain the advanced technology of metal flow linear method, it is a kind of chipless machining method. Theoretically, the cold roll forming products without turning can be directly on heat treatment and grinding. At present, the cold rolling technology is mainly used in medium and small deep groove ball bearing, the main process for:
Forging blank (ring) - turning (except channel) - rolling (ditch and chamfering) the whole diameter - soft grinding both ends
Is made of cold rolling technology and forging forming process, the precision of the products in addition to the affected by the precision equipment, but also influenced by forming mold accuracy.
3), turning to shape
In bearing industry, the traditional cutting molding technology is to use a special lathe, the concentration process method is adopted to complete the processing. But as a result of this method used equipment adjustment is difficult, low accuracy of machine tool, the material utilization rate is low, so the process is to be eliminated.
With the development of science and technology, the numerical control turning machine tool developed rapidly and is becoming more and more perfect. At present, some of the complex shape, high precision products are increasingly using the numerical control turning molding technology.
To sum up, the ring forming direction should be toward the metal high material utilization, high production efficiency, forming the direction of high precision. Therefore, high-speed upsetting technology, technology, the numerical control turning cold rolling forming technology will get more and more applications.