基于H型钢残余应力主动控制的矫直工艺设计

Process design based on active residual stress control of H-beams during a straightening process

针对H型钢辊式矫直过程残余应力的主动控制,基于工程弹塑性理论建立一种矫直过程应力演变的分析模型;采用离散解析实现对模型的快速数值求解;继而基于该分析模型建立一套能够实现残余应力主动控制的工艺参数主动设计方法;运用该方法对典型规格H型钢矫直工艺参数进行工艺设计.建立的分析模型运算结果与有限元结果吻合且计算成本得到有效控制,模型能够实现有限时间内整个矫直工艺参数域内残余应力演变结果的分析;工艺设计方法能够得到一定目标参数和约束条件下的残余应力主动控制工艺参数.

Aiming at the active residual stress control of H-beams during a roller straightening process,an analysis model of stress evolution during the straightening process is constructed based on the elastic-plastic theory. A numerical solution method to quickly deal with the analysis model is investigated by discrete analysis. Then,an active design method of process parameters that can realize active residual stress control is established according to the analysis model. By using this method,process parameters are designed for typical specification H-beam straightening. Calculated results using the analysis model match those by a finite element method well and the analysis model makes the computational cost saved. The analysis model can achieve the result analysis of residual stress evolution within the feasible region in limited time. The process design method can get the process parameters of active control under specific target parameters and constraint conditions.