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Application of numerical simulation of weld lines in the car bumper injection mold design

Wang Wei1,2,Sheng Dan2,Cai Jiasheng3,Zhou Yingguo2(1.Branch of Yangzhou,Special Equipment Safety Supervision Inspection Institute of Jiangsu Province,Yanzhou Jiangsu 225003,China)(2.School of Material Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China)(3.Suzhou Institute of Technology,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China)  
In order to design the injection mold for the car bumper,the formation of weld lines in injection molding of polymer is analyzed and the manufacturing procees of the car bumper is numerically simulated.The filling of melt and the requirement of the clamp force for three kinds of design methods,which includ central gate,four gates and six gates,in conventional feeding system and their sequence control technology are compared.The results show that not only the requirement of the clamp force is reduced obviously by using six gates sequence control technology,but also the formation of weld lines can be controlled effectively.Furthermore,the reasonable method of design is gained by adjusting the time for openning and closing of the gates and the eligible parts are manufactured.
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