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轨道客车用不锈钢冷硬板表面振纹分析及控制
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Abstract:
轨道客车用不锈钢冷硬板在冷轧过程中表面出现了严重的振纹缺陷，通过特征分析发现振纹缺陷明暗相间条纹是带钢表面微观孔洞多少差异的结果。大量现场试验分析表明振纹的振动属于第三倍频颤振，振纹缺陷明暗条纹间距与轧制变形区接触弧长轧制延伸后长度基本相同。此外，通过研究带钢表面振纹缺陷形成过程，确定了轧制打滑是振纹缺陷产生的直接原因，而道次绝对变形率、轧制前后张力差、轧制速度工艺、工作辊换辊工艺对打滑控制起决定性作用。本文通过优化轧制工艺、完善换辊制度可以有效抑制打滑，从而控制轧制振纹缺陷的产生。
Serious vibration marks were found on the surface of chill plate of stainless steel for railway vehicle in cold rolling process. It is found that the alternately bright and dark stripes of vibration marks were the result of the quantitative difference of micro-porosities on the surface of strip through characteristic analysis. The results of a mass of field experiments show that the vibration belongs to the third-octave mode, and the transferred length of contact arc in the deformation area is equal to the length of vibration marks on the strip. In addition, it is identified that rolling skid caused vibration based on the study of the formation process of vibration marks. Single pass information rate, front and backward tension difference, rolling speed process, roll-changing process have a decisive effect on controlling skid. Furthermore, optimizing rolling process parameters and improving roll-changing institution can effectively inhibit skidding; finally control the defect of vibration marks.
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