Crack Analysis and Optimization of Casting Spring Pin on Bottom Plate of EMU
Author of the article:LI Shuhai
Author's Workplace：R&D Center, CRRC Qingdao Sifang Co., Ltd., Qingdao 266000, China
Key Words：EMU bottom plate spring pin crack casting defects cold insulation
Abstract：
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.
