Precision cold rolling technology is a cold forming method of extruding and plastically deforming annular rotary parts at room temperature to obtain finished parts. Precision cold rolling can make the size and shape of the workpiece as close as possible to the theoretical value of the finished product. Its advantages are: 1. It can significantly improve material utilization and processing efficiency. Compared with the traditional turning method, the precision cold rolling process can increase the material saving rate by more than 10% to 15%, thereby realizing the cutting process of the bearing ring and reducing the processing cost. 2. It can improve the quality of finished products. Due to the rolling method, the metal streamline inside the part is continuous and complete, the metal grains are relatively uniform and small, and the structure is relatively dense, so the strength of the part is improved. At the same time, due to the residual surface stress of the finished parts, the deformation of the parts after heat treatment is also small. 3. It can save energy and improve the working environment. Compared with the forging die, the tonnage of equipment required for precision rolling is smaller, which can significantly reduce the noise during processing, and the energy saving effect is obvious. Compared with turning billets, the noise and dust are smaller. When rolling the workpiece, the rolling wheel drives the workpiece to rotate, and the core roller squeezes the workpiece under the push of the support wheel fixedly connected with the feeding device, thereby realizing the rolling of the workpiece. From the force condition of the workpiece, the conditions to satisfy the forming are: the force in the horizontal direction of the workpiece must be balanced with the force applied in the feed direction, which is a necessary condition for stable deformation; the force in the vertical direction of the workpiece must be greater than or equal to The push-out force generated by the deformation of the workpiece is the condition for the rolling to continue. The above two forces are the component forces in the horizontal and vertical directions of the normal force of the contact arc between the supporting wheel or the core roller and the workpiece. Deformation is effective when the feed of the support wheel is sufficient to ensure plastic deformation throughout the entire wall thickness of the workpiece. Moreover, the feed rate depends on the driving power of the roller, the thrust of the supporting wheel, the radius of curvature of the roller and the core roller. The size of the feed determines the length of the contact arc between the support wheel or core roller and the workpiece, which corresponds to the normal deformation force generated by the deformation of the workpiece. The longer the contact arc, the greater the deformation force. Due to the different curvature radii of the inner and outer circles of the rolling wheel, the core roller and the workpiece, the deformation produced by each feed is not equal inside and outside the workpiece. The deformation of the outer circle of the workpiece is greater than the deformation of the inner circle. As the rolling process progresses, the difference between the deformation of the inner and outer circles will decrease. The roundness stick is used to control the cylindricity of the workpiece. During the rolling process of the workpiece, the roundness stick is always close to the outer circle of the workpiece, retreats with the increase of the outer diameter of the workpiece, and provides a constant full-circle bending moment. The use of the roundness stick can also ensure the stability of the rolling process of the workpiece, effectively reduce the vibration during rolling, and thus prolong the life of the mold and the spindle bearing of the machine tool. At present, foreign precision rolling equipment mainly includes URAW series of BAD DUBEN in Germany and CRF and TCR series of KYOEI in Japan. They respectively represent two technical routes: BAD DUBEN adopts vertical arrangement and electro-hydraulic position servo control system to improve the rolling precision, while KYOEI adopts horizontal arrangement, rough rolling and workpiece diameter adjustment to improve the precision of the workpiece. Dimensional accuracy.  

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