高速轨端部平直度控制方法的研究与运用

Researches and Applications of Control Method for Flatness of High Speed Rail Ends

为解决钢轨端部平直度不达标的问题,分析了高速轨端部平直度不合格的原因,指出钢轨每道次进轧机时的冲击力和出钢时走势不正是导致端部原始曲率大小和方向各不相同,经矫直后造成端部平直度不稳定的原因。针对端部平直度不稳定的问题,采用大变形+小变形矫直方案,设计正交试验,得到最优矫直压力参数;分析矫前矫后平直度数据,得出矫前原始曲率控制范围。通过上述措施,优化矫直工艺后的钢轨端部平直度完全满足标准要求,并稳定控制在较窄的波动范围内。

To solve the problems of substandard rail end flatness,the reasons for the unqualified flatness were analyzed,the impact forces of the rails in each pass mill and the tendency of tapping were inconsistent that resulted in different original curvature sizes and directions thus the instable flatness was produced after straightening.In order to solve the problem of unstable end flatness,the orthogonal experiments were designed using the large deformation+small deformation straightening,and the optimal straightening pressure parameters were obtained.The original curvature control ranges were obtained by analyzing the flatness data before and after corrections.Through the above measures,the end flatness of the rails after the optimized straightening processes fully meets the standard within a small fluctuation ranges.