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Analysis of the fine cold heading skills of bearing rings

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The fine cold heading skill is a cold forming method in which the ring-reversing parts are kneaded and plastically deformed at room temperature to obtain the product parts. Fine cold heading can make the scale and shape of the workpiece reach the theoretical limit of the product. The strengths are:
1. Can significantly improve the data utilization rate and processing power. Compared with the traditional turning processing method; fine cold heading processing can improve the data saving rate by 10% to 15%; then complete the machining of the bearing ring; reduce the processing cost.
2. It is possible to improve the quality of the product. Because of the selection of the rolling method; the metal flow lines inside the parts are connected and intact; the crystal grains of the metal are relatively uniform and the 橹 埽 埽 慵 慵 慵 慵 慵 ; 一起 一起 因为 因为 因为 因为 因为; The existence of stress; also makes the deformation of the part after heat treatment is small.
3. It can save energy; improve the working environment. Compared with forging die; the tonnage of the equipment required for fine rolling is better than that of the disaster-stricken file. Compared with turning blanks; its noise and dust are more small.
When the workpiece is pressed; the wheel rotates the workpiece; the core roller kneads the workpiece under the advancement of the support wheel fixed to the feeding device; then the rolling of the workpiece is completed. From the force of the workpiece; the condition of satisfactory forming There is: the horizontal force of the workpiece needs to be balanced with the force applied by the feed direction; this is a necessary condition for the stable deformation. The force in the straight direction of the workpiece needs to be greater than or equal to the deformation force of the workpiece; this is the rolling force. The conditions that are sustained. The above two forces are the component forces of the support wheel or the core roller and the workpiece touching the circular arc normal force in the horizontal and straight directions. When the feed amount of the support wheel is sufficient to ensure plastic deformation of the entire wall thickness of the workpiece; The deformation is useful. And the feed rate depends on the driving power of the boring wheel, the thrust of the support wheel, the radius of curvature of the boring wheel and the core roller. The size of the feed determines the length of the touch wheel or the core roller and the touch arc of the workpiece. Corresponding to the normal deformation force of the workpiece deformation; the longer the touch curvature, the greater the deformation force.
Because the radius of curvature of the inner circle of the boring wheel, the core roller and the workpiece is different; the deformation occurring in the workpiece table is not equal for each feed. The deformation of the outer circle of the workpiece is greater than the deformation of the inner circle; The rolling process is carried out; the difference in the amount of deformation in the table will be reduced. The roundness stick is used to manipulate 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; The diameter is added to retreat; and a stable full circle bending moment is supplied. The selection of the roundness stick can also ensure the smoothness of the workpiece rolling process; usefully reduce the sensation in the expansion; then extend the die and machine spindle bearing life .
At present, the foreign fine equipment mainly includes the URAW series of German BAD DUBEN and the CRF and TCR series of Japan KYOEI. They represent two skill roads: BAD DUBEN uses vertical placement and electro-hydraulic azimuth servo control system to improve rolling pressure. Accuracy; KYOEI company selects the combination of horizontal placement, roughing and workpiece diameter to improve the dimensional accuracy of the workpiece.

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