Optimization of warpage deformation of thin-walled injection molded parts based on GA-BP-PSO algorithm
Taking the plastic bottle preform made of polyethylene terephthalate(PET)as an example,the gating system and cooling system were designed by Moldflow software and finite element analysis was carried out to optimize the warping deforma-tion of the workpiece.Five factors including melt temperature,mold temperature,holding pressure,holding time and injection time that influenced the warping deformation were identified,the orthogonal experiment table of L16(45)was designed,and the data were analyzed by range,so as to obtain the degree of influence of various factors on the amount of warpage and to obtain better process parameters.The process parameters were further optimized through the GA-BP-PSO algorithm,and the best process parameters are obtained:the melt temperature is 265℃,the mold temperature is 60℃,the holding pressure is 125 MPa,the holding time is 12.867 1 s,the injection time is 0.340 5 s.The warping deformation of the workpiece corresponding to the above process parameters is 0.137 3 mm.Finally,the numerical simulation was carried out by Moldflow software,and the warpage deformation is 0.139 5 mm,which is 22.33%lower than the warpage deformation before optimization of 0.179 6 mm.The difference between the software simu-lation value and the predicted value obtained by the GA-BP-PSO algorithm is only 1.60%,and the optimized process parameter combination is applied to actual production.The obtained products meet the production requirements,verify the accuracy and feasi-bility of the GA-BP-PSO algorithm.
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