Multi-objective optimization of automotive handles gas-assisted injection molding process based on Moldflow
Automotive interior handles are typical rod-shaped parts,which are often produced using gas-assisted injection molding(GAIM)technology to meet the strength and lightweight requirements.Due to the multiple molding parameters of GAIM,it is difficult to control the quality of plastic parts.By using Moldflow simulation analysis and combining with Taguchi test method,the molding process parameters were optimized such as gas penetration length and minimum wall thickness of the cross-section of the plastic parts.Five main factors,including melt temperature,mold temperature,gas pressure,gas holding time,and pre injection volume,were selected for orthogonal experiments,The influence of the five process parameters on gas penetration length and minimum wall thickness of the cross-section was studied using range analysis.The multi-objective comprehensive equilibrium method was applied to obtain the optimized process parameter combination,which includes a melt temperature of 250℃,a mold temperature of 50℃,a gas pressure of 10 MPa,a gas holding time of 10 s,and a pre injection volume of 75%.Through actual GAIM verification,the gas penetration effect of plastic parts is good,meeting the requirements of penetration length and minimum wall thickness of cross-section.The weight of plastic parts is reduced by more than 25%,and it has good surface quality and dimen-sional accuracy.It can significantly shorten the molding cycle,save plastic materials,improve production quality and efficiency,and meet the requirements of automotive light weighting..
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