影响大型H型钢开坯过程残余应力的研究

摘要

利用Deform-3 D有限元模拟软件对H型钢开坯过程进行数值仿真模拟。分析得到了不同开坯温度、初始晶粒尺寸和不同轧制速度下的H型钢断面残余应力变化规律。通过模拟结果发现大型H型钢在开坯过程中产生的残余应力主要来源于变形不均。轧制过程中腹板部位变形量大，翼缘仅在轧制表面产生变形，H型钢变形的不均匀性使得其轧后存在很大残余应力。高温开坯轧制较低温开坯轧制轧后残余应力低，增大坯料晶粒尺寸会降低腹板残余应力，但整体残余应力会增加。提高箱型孔轧制速度R角部位和翼缘边部残余应力明显减小。%Based on the software of Deform-3D,the blooming process of H-beam is simulated.The influence of dif-ferent blooming temperature ,different initial grain size and different rolling speed on residual stress is analyzed .Ac-cording to the simulation result ,in the blooming process ,the residual stress of large sized H-Beam is mainly caused by uneven deformation .The big deformation exists in web .While ,the flange deformation is only generated in rolling surface.This uneven deformation leads to big residual stress in rolling piece .The residual stress of higher blooming temperature is much bigger than that of lower blooming temperature .Enlarging blank grain size has caused residual stress of web reduce ,however ,whole residual stress will increase .Increasing the rolling speed of box-pass can signif-icantly reduce the residual stress of R-joint and edges of flange .