Analysis and Optimization of Special Sand Casting Process for a Titanium Alloy Pump Body
Pump body is a common part in the field of petrochemical industry.In the casting process,there are large shrinkages in the bottom flange of the pump body at one side of the spiral double runner and the flange with a convex position,and large pressure pits appear after hot pressing,which seriously affects the quality of the casting.Based on Procast software,this paper established a simulation model for the casting of the pump body,analyzed the location and size of the defects of the pump body under different casting schemes,and optimized the pouring system.The simulation study showed that the problem of large shrinkages in the pump body was effectively solved by setting graphite cold iron on the lower flange for freezing,and the shrinkages reduced from 55 cm3 to 1.44 cm3.The overall decrease was 97.4%.Combined with the established finite element model,orthogonal test and response surface were used to optimize the process parameters.The optimal process conditions predicted by the model were that the initial pouring temperature was 1 770℃,the initial pouring radius was 39.9 mm,the pouring time was 5.1 s,and the total shrinkage size of the pump body was 1.421 cm3.Compared with the predicted value of the response surface model,the error is 0.63%,which verifies the reliability of the response surface model and can provide guidance for the subsequent practical production.
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