汽车热轧大梁钢分条后出现侧弯的原因分析

汽车轻量化发展需要不断提升汽车钢的强度，而钢材强度越高则内应力均匀性越难控制。为了研究某热轧线汽车大梁钢分条后出现侧弯的问题，通过分析分条后各窄条与基准的实测距离值，研究出一套符合该问题研究的方法，并推导出相应的一组计算公式。根据推导的公式计算了各窄条的侧弯量大小和原板残余应力分布，结果表明，窄条出现侧弯是热轧卷板形不对称以及呈现边浪趋势造成的。根据研究结果，有针对性地提出了改善措施，并取得了明显的应用效果。

Cause analysis on lateral bending of hot rolled steel strip for automobile beam after longitudinal cutting

The increase of strength of automobile steel is required for the lightweight development of automobile. The higher strength, however, leads to more difficulty in achieving the control of the uniformity of internal stress in the steel strip. In order to solve the problem of lateral bending of hot rolled steel after longitudinal cutting, through the analysis of the actual measurement distance value between each narrow strip and the criterion, a methodology of the problem was put forward, and a group of the corresponding computational formula was derived, which was used to calculate the bending value and residual stress distribution. The calculation results showed that the lateral bending of strips was due to the asymmetric wave or potential edge wave of hot- rolled coils across the width. According to these results, some improvement measures were proposed pointedly, and the remarkable results were achieved.