Rolling Bearing Forming process
Although the number of bearing types, its structural type, tolerance levels, material selection, processing methods are different, but the basic manufacturing process, contains the following:
Bearing Parts Manufacturing - bearing parts inspection - bearing parts demagnetization, cleaning, rust-proof - bearing assembly - Bearing finished product inspection - bearing finished demagnetization, cleaning - bearing finished product storage hopper oiled packaging.
Rolling Ring is the important part, due to wide variety of rolling bearings, making different types of bearing ring size, structure, and manufacture of equipment used, processes and methods vary. Also, because processing operations Rings and more complex process, high precision machining, therefore, the quality of the bearing ring machining accuracy, service life and performance have a significant impact.
Ring made of raw materials for the cylindrical bar or tube material, the present molding process according to different bearing rings generally have the following manufacturing process.
1) (bar), the material - Forging - annealed (or normalized - Turning (Cold Rolling Forming) - heat-quenching and tempering - grinding - Part Inspection - demagnetization, cleaning - submitted by assembly
2) (bar, pipe material), the material - Cold Rolling Forming - heat quenching and tempering - grinding - Part Inspection - demagnetization, cleaning - submitted by assembly
3) (tube material), the material - turning molding - heat quenching and tempering - grinding - Part Inspection - demagnetization, cleaning - submitted by assembly
4) (bar), the material - cold (temperature) Extrusion - Turning - heat quenching and tempering - grinding - Part Inspection - demagnetization, cleaning - submitted by assembly
Ferrule molding method
Present Rings processing, forming methods are mainly the following: Forging molding, turning forming, cold forming and cold rolling (temperature) extrusion molding. In the above molding method, forging forming the most widely used, accounting for 80% of the total production volume of about, for some generic products can be used a small stick (tube) feed directly to turning shape. Since the 20th century, 80 years, China's small and medium sized enterprises in small and medium sized rings used in the production of cold rolling and cold (warm) extrusion molding process.
1) Forging Forming
Through the forging of metal within the defect can be eliminated to improve the metal structure, so that a reasonable distribution of metal flow line, the metal tightness good. Forging forming process is widely used in bearing molding processing, it can be completed from the small diameter of ~ 20mm diameter 5000mm products to the large product processing. Forging a common molding methods are: hot forging processing, cold processing, warm forging process, mainly in China in order to forging.
Hot processing of different processing equipment because of its shape is further divided into: free forging process, forging process presses, flat and high-speed forging machine forging process Upsetting Machine forging process.
2) Cold Rolling Forming
Cold rolling process is one that enhances material utilization, improve the metal structure compactness and maintain the advanced technology of metal flow of the linear approach, which is a non-chip processing methods. In theory, cold rolling forming for turning the product can be directly carried out without heat treatment and grinding. At present, the cold rolling process is mainly used in small and medium sized deep groove ball bearings, the main process as follows:
Forging blank (ring) - Turning (except Channel) - Rolling (groove and chamfer) the whole track - Soft Grinding surface at both ends of
With cold rolling process and forging molding process, the accuracy of the product in addition affected by the accuracy of equipment, but also by the accuracy of the impact of mold.
3) Turning Molding
In the bearing industry, turning the traditional molding technology is the use of special machine tools, a centralized method to complete forming process. However, this method is difficult to adjust the equipment used, low precision machine tools, material utilization is low, so the process method is being phased out.
With the scientific and technological development, CNC turning machines and the rapid development of increasingly sophisticated. At present, some form complex, high precision products that are increasingly using CNC turning molding technology.
To sum up, the direction of forming rings should be toward the high utilization rate of metal materials, high efficiency, high precision molding direction. Therefore, high-speed upsetting technology, cold-rolling technology, CNC turning molding technology will be more and more applications.
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