The metallographic structure of the two types of rolling wheel bodies shows significant differences, which reflect distinct material usage conditions. These variations are primarily due to different heat treatment processes. The way cracks propagate is largely influenced by the metallurgical quality of the steel and its mechanical properties during operation.
Different tooth designs affect the material's resistance to deformation during processing. For components requiring higher hardness, it is necessary to increase the rolling wheel’s hardness accordingly. This leads to variations in working stress, with flat-bottomed rolling wheels experiencing higher stress than their round-bottomed counterparts, contributing to differences in performance and durability.
Therefore, the current steel used should be either strengthened or toughened. Alternatively, a high-strength bolt rolling wheel made from a steel with better toughness than CrlZMoV could be considered to improve overall performance under operational conditions.
The method used to form the thread on the rolling wheel has a major impact on its performance. Rolling threads enhances precision and aligns the material flow lines, thereby increasing the strength of the teeth. However, if not carefully controlled, this process can leave behind defects from prior processing, such as residual surface layers or unremoved decarburized areas, which may lead to new flaws.
In contrast, grinding threads offers opposite advantages and disadvantages. While it provides better surface finish, it may compromise material strength. From a cost perspective, rolling threads is more economical and efficient.
Through detailed analysis and discussion, the following conclusions can be drawn:
1. The structural design of the two rolling wheels differs, and the dome-shaped, round-bottom structure of RDI appears to be a more suitable option.
2. Although the materials used in both types of rolling wheels are similar, the difference in metallurgical quality indicates a significant variation in their service condition, resulting from different heat treatment methods. Crack propagation behavior is mainly influenced by the steel’s metallurgical quality. RDZ should consider strengthening and toughening measures or use a steel with higher toughness to enhance its mechanical performance under operational conditions.
3. The heat treatment processes for the two rolling wheels vary. For parts that require high hardness, the rolling wheel’s hardness should be appropriately increased. In recent years, factors like vibration and noise have gained more attention in terms of performance evaluation.
Based on research into the vibration and noise mechanisms of the drive axle, a new approach to noise control in the drive axle assembly has been proposed. It is hoped that this method will assist manufacturers in producing quieter drive axle assemblies.
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