The Research And Application Of Preplasticizing Theory Of Injection Molding Machine

The paper, as a part of the collaborative project between the Production Engineering Research Center of Zhejiang University and Haitian Machinery Co. Ltd, mainly research the preplasticizing process of the injection molding machine and the optimization design of injection screw.In this paper, the developing status of the injection molding machine, the preplasticizing theory and the developing status of the numerical simulation of preplasticizing process are introduced. On the base of transient melting theory in the solid conveying theory, a novel physical model of injection screw is put forward,in which solid and liquid are relatively separated, the energy loss during the thermal transmission is decreased and the melting speed rate of the plastic is improved. The parametric module of injection screw is built, based on the FLOTRAN CFD (Computational Fluid Dynamics) of ANSYS. The parametric mathematic model based on the melt conveying theory, which can be used to the numerical simulation and optimization of preplasticizing process, is established, thus the result that optimized screw's performance is better than standard screw's, have been approved by the contrasted experiments. At last all the research are summarized and open questions are discussed in this paper.