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

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.