Numerical Analysis of Packing Stage in Plastics Injection Molding
Liu Chuntai, Chen Jingbo. Dong Binbin. Shen Changyu
(NERC of Mold & Die, Zhengzhou University , Zhengzhou ,450002)

Abstract: Packing is an important stage in plastics injection molding. It may influence quality, internal structure and dimension precision of the final parts. Based on rational assumptions, appropriate material model and engineering analysis , the equations for governing the packing process are obtained using the basic equations of Non-Newton, compressible, viscous fluid. A hybrid finite-element/finite-difference method was used to model this processing, and a practical example are used to illustrate how to resolve some engineering problems, such as packing pressure, gate frozen time and clamp force.
Keywords: Injection-molding, packing stage, numerical simulation.