Multi-Objective Optimization of Low-Pressure Casting Process of Aluminum Alloy Cylinder Block Based on Entropy Method
Based on the finite element software ProCAST to construct the finite element model of a certain type of aluminum alloy cylinder block,the L16(44)orthogonal test scheme was designed,and the influences of four process parameters of pouring temperature,mold preheating temperature,filling time and holding pressure on solidification time and shrinkage volume were explored.The entropy method was used to calculate the weights of the two evaluation indexes,and the solidification time and shrinkage volume were converted into comprehensive scoring values for single-objective optimization.Through range analysis and ANOVA,the influence of each parameter on the comprehensive score was obtained:pouring temperature(A)＞mold preheating temperature(B)＞holding pressure(D)＞filling time(C),and the optimal process parameters were determined as A4B4C4D1.Compared with the original process parameter scheme and the preferred process parameter scheme,it was found that the solidification time shortened by 20.35％,and the shrinkage volume decreased by 2.96％.After the production test,the appearance quality of the cylinder casting was good,and there were no obvious casting defects,which verified the rationality of the optimal process parameters.
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