Development of Piston Casting Technology for High-speed Rail Braking System
The piston in the high-speed rail braking system requires full body X-ray inspection and MT/PT inspection,with a defect level not exceeding level 2.After casting processing,all processing areas are required to have no visible defects.The initial casting process mainly results in visible shrinkage defects in the"bowl bottom"area after precision machining of the casting.In order to solve the casting defects,measures such as using 3D printed sand shells to place sand blocking cold iron at the bottom of the casting,and using the DOE analysis function of MAGMASOFT casting simulation software to lay cold bars cannot fundamentally solve the problem of"bowl bottom"shrinkage and looseness.Finally,after simulation analysis using MAGMA software,a plan of filling the"bowl bottom"was adopted,and the defects were removed through rough machining.The product was successfully developed.
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