焊接热源局部坐标移动曲线路径建模方法

Modeling heat source of dynamic welding with local coordinate curve path

为解决轨道客车转向架构架的制造及应力变形分析中,遇到的曲线动态焊接热源建模难度大、难以实现的问题,根据焊接结构特征,研究了空间复杂焊接路径热源建模理论,定义了焊接热源坐标移动模式。据此,只需通过简单的参数输入和Ansys软件操作即可完成曲线路径动态焊接的热源建模。设计了平面曲线路径、空间曲线路径和转向架复杂模型焊接热源加载方法。本文提出的移动热源模型和焊接曲线路径实现方法,是利用数值模拟研究焊接路径,在加深对焊接过程的理解的同时,可设计选择合理工艺,控制残余应力和变形,从而实现高效、优质的焊接过程仿真。

There exist several problems in the production and stress analysis of bogie frame of railway passenger cars.It is very difficult to establish the dynamic welding heat source model and implement the processing.To solve the problems,the theory of space welding path is investigated and the shifting mode of the welding heat source coordinate is defined.Then,the welding heat source coordinate model is established by parameter inputting and operating in software ANSYS.A loading method of the plane curve path,space curve path and bogie frame of passenger car model is proposed.Numerical simulation is used to perform the moving heat source model and welding curve path method,thus to understand the welding process and control the residual stress deformation by choosing reasonable production process.The welding process simulation can be realized efficiently and exactly.Therefore,the theory proposed is of significance in theoretical research and engineering application.