The speed of 350 km standard EMU (Fuxing), as the general product of China's high-speed railway, is of great significance to our company. It is self-evident that the front end of the chassis belongs to the key process in the manufacture of aluminum alloy body, Traction, is the top priority of the manufacturing process, so the chassis front end of the main structure of the geometric diimensions and geometric tolerances are extremely stringent requirements. The innovation mainly solves the main problems that occur in the processing, assembly and welding of all the sub-com- ponents that affect the deformation of the main body at the front end of the chassis. 350 mobile front end of the chassis has changed 380B models have been used in the box-type structure into an open welded structure, due to changes in the force and the complexity of the structure and other reasons, the assembly error of various components accumulated to the composition process The main structure of the vertical and flatness of the shape of the tolerance tolerance, this issue has become the impact of assembly and post-Leica detection processes such as the key issue.%时速为350km的标准动车组(复兴号)作为中国高铁的统型产品,对我公司的重要意义不言而喻,底架前端属于铝合金车体制造中的关键工序,起到车体的承重和牵作用,是制造工序的重中之重,因此对底架前端主体结构的几何尺寸和形位公差的要求也极其严格.本创新主要解决的是影响底架前端主体变形的所有次部件加工、装配、焊接中出现的主要问题.350标动的底架前端改变了过去380B车型一直沿用的箱体式结构变为开放式的焊接结构,由于受力方式的改变及结构复杂等原因,各次部件的装配误差累积到组成工序后表现为其主体结构的垂直度和平面度等形位公差的超差,这个问题成为影响后道组装和莱卡检测等工序的关键问题.
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