关键词: 微注射成型, 无网格方法, 光滑粒子流体动力学, 数值模拟

Abstract: Micro injection molding is an efficient and low cost process for the large-scale replication of thermoplastic polymer microparts.Numerical simulation in cavity filling is important to mold design and process parameters setting before mold manufacture.A meshfree-based method for solving viscosity equations was proposed to simulate the filling process of micro injection molding.The N-S governing equations were discretized by using a particle approximate method of smooth particle hydrodynamics.Some physical properties,such as velocity,pressure,and temperature were investigated in the filling process.As an example,mold cavity filling simulation for a microneedle used in biomedical application was performed,and the results were consistent with experiment.Compared with the traditional mesh method,such as three dimensional finite element method,with corresponding node or particle number and process condition,the proposed meshfree method showed advantages of higher accuracy and calculation efficiency.

Key words: micro injection molding, meshfree method, smooth particle hydrodynamics, numerical simulation