动车组底板铸造弹簧销裂纹分析及优化

Crack Analysis and Optimization of Casting Spring Pin on Bottom Plate of EMU

针对动车组底板铸造弹簧销裂纹故障,从结构、工艺、仿真、断口等方面进行了分析,故障原因是由于弹簧销壳体底部尺寸过小,且质量过程控制不严,导致铸件本身存在冷隔、缺肉等缺陷,在装车使用过程中扩展而产生裂纹。优化措施为加大壳体底部高度及厚度尺寸,以增大此处金属熔液通行截面积,改善其充型能力,降低铸造缺陷;细化产品检验要求,对产品外观状态进行全检筛选,杜绝缺陷产品装车。

The crack fault of cast spring pin on the bottom plate of EMU was analyzed from the aspects of structure,technology, simulation and fracture. The reason for the failure is that the bottom size of the spring pin shell is too small,and the quality process is not strictly controlled, which leads to the defects of the casting itself, such as cold insulation,misrun, etc., and cracks occur during the process of loading and using. The optimization measures are to increase the height and thickness of the bottom of the shell to increase the cross section area of molten metal, improve its mold filling capacity and reduce casting defects. Refine product inspection requirements, conduct full inspection and screening of the appearance of products, and eliminate the loading of defective products.