Simulation of mold filling and prediction of gas entrapment on practical high pressure die castings

来源期刊：中国有色金属学报(英文版)2010年第11期

论文作者：赵海东 白砚飞 欧阳晓贤 董普云

文章页码：2064 - 2070

Key words：high pressure die casting; mold filling; gas entrapment

Abstract: Element parameters including volume filled ratio, surface dimensionless distance, and surface filled ratio for DFDM (direct finite difference method) were proposed to describe shape and location of free surfaces in casting mold filling processes. A mathematical model of the filling process was proposed specially considering the mass, momentum and heat transfer in the vicinity of free surfaces. Furthermore, a method for gas entrapment was established by tracking flow of entrapped gas. The model and method were applied to practical ADC1 high pressure die castings. The gas entrapment prediction was compared with the fraction and maximum size of porosities in the different casting parts. The comparison shows validity of the proposed model and method. The study indicates that final porosities in high pressure die castings are dependent on both gas entrapment during mold filling process and pressure transfer within solidification period.