中厚板矫直残余应力仿真

根据某热轧厂横切机组中2#矫直机(11辊辊式矫直机)的工艺参数,建立钢板在矫直过程中的三维动态有限元模型。通过仿真得到矫直过程中各辊对钢板矫直力的数据,并结合实测数据验证模型的合理性;在此模型的基础上,分析钢板在矫直过程中横截面上的应力变化规律及不同压下规程对钢板残余应力的影响,结果表明,矫直过程中,钢板应力类似于应力波的形式由轧件头部向尾部传递,其中沿矫直方向的纵向应力占主导地位,应力主要是由纵向纤维上的反复弯曲变形所产生;适当抬高1#辊的位置,即可改善矫后钢板残余应力的分布,进而提高钢板的矫直质量。

Finite element analysis for the residual stress of plate during straightening process

According to the process parameters of 2# straightening machine(11 rolls straightening machine),the 3-D dynamic finite element model of the steel in straightening process was established by using the FEA software.The straightening force of each roll on the plate were derived first and compared with the simulation data to verify the reasonableness of the model.The regulation of the stress distribution on the cross section of the steel during straightening and the effect of different rolling schedules to the residual stress of steel were analyzed.The simulation results indicate that in the straightening process,the stress of the plate spread from the head to the rear of the rolled steel,in form of stress-wave,while the stress along the longitudinal direction caused by the repeated bending of the longitudinal fiber plays a leading role.Appropriate elevating the position of the 1# roll could improve the distribution of the residual stress of the steel plate,and the quality of the plate.