基于热-机耦合方法的列车侧墙火焰矫形工艺分析

Analysis of Flame Rectification Technology of Train Sidewall Based on Thermo-mechanical Coupling Method

为了研究工艺参数对火焰矫形效果的影响,通过试验对2.5 mm厚的列车侧墙典型模块点状加热矫形进行了方案设计,设计了不同加热温度、加热位置布局和加热顺序下的热矫形方案。基于热-机耦合的弹塑性有限元方法对各方案进行了仿真分析。通过对各方案下模块结构边缘的残余应力分布状态的对比与分析,确定了各试验参数对矫形效果的影响规律。结果表明:对于所研究的侧墙典型模块,加热温度越高、加热布局越密集,矫形后侧墙边界残余应力越大,矫形效果越好;采用750℃加热密集布局旋转的加热顺序可以得到较高的边界残余应力,最高为36.31 MPa。

In order to study the effect of process parameters on flame rectification,a scheme design for point heating rectification of the typical module on the 2.5 mm thick train side wall was carried out by test.The thermal straightening scheme under different heating temperature,heating position layout and heating sequence was designed.Based on the thermo-mechanical coupling elasto-plastic finite element method,the simulation analysis of each test scheme was carried out.By comparing and analyzing the residual stress distribution status of the edge of the module structure under each scheme,the influence rule of each test parameter on rectification effect was determined.The results show that for the studied typical side wall module,the higher the heating temperature,and the more dense the heating layout,the greater the residual stress at the boundary of the side wall after rectification is,the better the rectification effect is.The high boundary residual stress with a maximum of 36.31 MPa can be obtained by heating at 750℃with dense layout and rotating heating sequence.