Rolling bearing manufacturing - ring forming processing

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 product packaging demagnetization, clean finished product oil - bearing dou finished goods inventory. 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) ( Bar) Blanking, forging, annealing ( Or is the fire - turning ( Cold roll forming) - heat treatment quenching and tempering - grinding - submit assembly parts inspection - demagnetization, cleaning - 2) ( Bar, pipe material) Blanking - molding - quenching and tempering heat treatment of cold rolling - grinding - parts inspection - demagnetization, cleaning - submit assembly (3) ( Pipe material) Blanking - cutting molding - heat treatment quenching and tempering - grinding parts inspection - demagnetization, cleaning - submit assembly (4) ( Bar) Blanking - cold ( Temperature) Extrusion - turning - heat treatment quenching and tempering - grinding - submit assembly parts inspection - demagnetization, cleaning - ring forming methods at present in the ring processing, molding method basically has the following kinds: forging forming, cutting forming, cold rolling forming and cold ( Temperature) Extrusion. In the above molding method, forging forming most widely used, accounting for about 80% of the total output, for some small general products can be used in a bar Tube) Direct cutting molding. 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 ( Temperature) Extrusion molding process. 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) Forming of cold rolling process of cold rolling is a kind of can improve material utilization, improve the metal tissue compactness, keep 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 technological process is: forging blank, The ring) - turning ( In addition to the channel) - rolling ( Ditch and chamfering) The whole diameter - soft grinding two end face is made of cold rolling technology and forging forming process, the precision of the products in addition to the affected by the precision equipment, also influenced by forming mold accuracy. 3) Cutting molding in bearing industry, the traditional turning molding technology is to use a special lathe, the concentration process method 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.