文档介绍：西南交通大学硕士研究生学位论文第1页摘要随着计算机技术和计算方法的快速发展,数值模拟技术已经成为现代工程学形成和发展的一个重要推动力。焊接是一个牵涉到电物理、传热、冶金和力学的复杂过程。焊接现象主要包括焊接时的电磁、传热、金属熔化凝固。冷却时的相变、焊接应力及变形等。在当今我国铁路高速大发展的环境下,铁路机车的安全问题尤为重要。转向架作为铁路机车的一个重要组成部分,其质量的好坏直接影响到铁路机车的运行安全。本文选取某厂货车用K7型转向架副构架作为研究对象,K7转向架副构架是K7 转向架中重要的组件,其结构是由三段B+级铸钢焊接而成的。若焊后残余应力及变形未达到设计要求会直接影响到机车车辆运行的安全。为了更好的验证现有焊接工艺可靠性,本文结合有限元方法及采用ESI公司焊接专用软件SYSWELD对K7转向架副构架进行了数值计算分析。根据K7转向架副构架建立其三维几何模型,划分网格模型,并设置热源参数。考虑到实际焊接生产过程中可能遇到的非常规焊接工艺,特设置多种焊接速度、焊接约束及焊接顺序,通过与实验数据及设计焊接工艺模拟结果比对,所得模拟结果与设计焊接工艺模拟结果较为吻合。由此验证了采用SYSWELD焊接模拟的可靠性,其结果可用于指导焊接生产。关键词:SYSWELD;转向架;副构架;有限元法:数值模拟西南交通大学硕士研究生学位论文第1I页 Abstract Withdevelopment puter technology andcalculation,in modern engineering numerical simulationtechnology e amajor driving forcefor formation and is aprocess with electrophysical,heat transfer,met·allurgical and including ic welding,heat transfer,metal melting solidification,Phasetransition,welding stressand deformation when thelarge-scaledevelopment ofrailwayhigh-speed isimportant forthesafety ofrailway as arailway otive is animportant part,ItsQual埘 directly affectsthesafeoperation ofrailway otives. This paper selects atype ofvicebogie frameas bogie蕾眨une is animpo她t forfreighte car bogie,It posed by three sectionsofB+grade thewdding residualstressand deformation does notfitfor thedesign requirements willdirectly affectthesafety order toshow thatthesimulating results are thispaper,using thefinitedement method and thespecial software SYSWELD on the K7welded toK7vicebogie frameestablish the three-dimensional geometric model,mesh divisionand setthe heat source pared鲥也experimental simulating resultsofthewelding processes are tocoincide witlltheexperimental results. Itshows thatthesimulating results arereasonable and callbeapplied intheproduction. Keywords:SYSWELD;bogie;viceframe;numerical simulation 西南交