**Analysis of the Fine Cold Heading Skills for Bearing Rings** Home > Bearing Knowledge > Analysis of the Fine Cold Heading Skills of Bearing Rings *Created on 2018/5/16* var cpro_id = "u3440131";

Analysis of the Fine Cold Heading Skills of Bearing Rings

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/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';

Fine cold heading is a cold-forming technique used to shape ring components by applying plastic deformation at room temperature. This method allows the workpiece to achieve near-theoretical limits in terms of size and shape, offering numerous advantages over traditional machining methods. 1. **Improved Material Utilization and Efficiency**: Compared to conventional turning processes, fine cold heading significantly increases material savings by 10% to 15%. It reduces processing costs and enhances overall efficiency when manufacturing bearing rings. 2. **Enhanced Product Quality**: The rolling process ensures that metal flow lines are continuous and well-aligned, resulting in uniform grain structure. This leads to better mechanical properties, reduced internal stress, and minimal deformation after heat treatment. 3. **Energy Saving and Better Working Environment**: Fine cold heading requires less tonnage compared to forging, and it generates less noise and dust than traditional turning operations, making it more environmentally friendly and cost-effective. During the pressing process, the workpiece rotates while the core roller deforms it under the support of the feeding device. For stable deformation, the horizontal force must balance the feed direction force, and the axial force must be sufficient to overcome the deformation resistance. These forces are derived from the normal contact between the support wheel or core roller and the workpiece. The feed amount must be adequate to ensure full wall thickness deformation. The feed rate depends on factors such as the driving power of the boring wheel, the thrust of the support wheel, and the curvature radius of the tools. A larger contact arc results in greater deformation force, which directly affects the quality of the final product. Due to differences in curvature radii among the boring wheel, core roller, and workpiece, deformation varies across different sections. The outer diameter typically experiences more deformation than the inner diameter. However, during the rolling process, this difference is gradually minimized. The roundness stick helps maintain the cylindrical shape by continuously adjusting the workpiece’s diameter and providing a stable bending moment. It also improves the smoothness of the rolling process, reduces expansion sensation, and extends the life of the die and spindle bearings. Currently, foreign advanced equipment includes the URAW series from Germany's BAD DUBEN and the CRF and TCR series from Japan's KYOEI. These systems represent two distinct approaches: BAD DUBEN uses vertical placement combined with electro-hydraulic servo control to enhance rolling accuracy, while KYOEI employs a horizontal setup with roughing and precise diameter control to improve dimensional precision.

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