Multi-objective optimization of automotive B-pillar upper trim plate injection molding process based on Critic weight method
In order to address the defective problems such as volume shrinkage and warping deformation during the injection molding process of the trim plate on the B-pillar of a car,the injection molding process was simulated using Moldex3D software and using talc powder modified polypropylene material.Sixteen groups of orthogonal experiments were designed with injection time,melt temperature,mold temperature,holding pressure,holding time as variables,volumetric shrinkage and warpage deformation in Z-direction(demolding direction)as objectives.The Critic weight method was used to calculate the weights of the two,and the multi-objective optimization was converted into single-objective optimization by calculating the comprehensive score.Finally,the polar analysis of the comprehensive score was used to obtain the size of the five process parameters affecting the volumetric shrink-age and Z-direction warping deformation of the trim plate of the B-pillar of the automobile,and the size of the process parameters were in the following order are as follows:holding pressure＞mold temperature＞filling time＞melt temperature＞keeping pressure.The optimal combination of molding process parameters are as follows:filling time is 2 s,melt temperature is 240℃,mold tempera-ture is 30℃,holding pressure is 70 MPa,holding time is 8 s.The optimal combination of molding process parameters is simulated,and the volumetric shrinkage of the product is 5.901%,and Z-direction warping is 1.75 mm.Compared with the initial analysis results,the volume shrinkage is reduced by 12.2%and the Z-direction warpage is reduced by 9.04%.Through the actual test mold verification,the product is completely filled,with good quality,in line with the production requirements.
automotive B-pillar upper trim panelMoldex3Dorthogonal testCritic weighting methodoptimization of process parameter
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