摘要
为了精确描述气体辅助充填成型中气体穿透推进过程,研究各工艺参数对成型结果的影响,本文基于气体穿透机理的研究分析,将三明治成型理论应用于气辅成型。以矩形平板型腔为例,结合Hele-Shaw流动模型,建立了气辅充填成型首次气体充填过程的压力控制方程和气/液交界面运动方程,对其应用有限元进行数值模拟。对气辅成型气体穿透过程及其基本规律和各工艺参数对成型结果的影响进行了分析和讨论。算例结果表明:三明治成型理论应用于气辅成型所建数学模型能较好地揭示气体穿透推进过程的基本特征,并可作为气辅成型过程与实验手段相辅相成的研究工具。
In order to describe accurately the gas penetration behavior and analyze the influence of processing parameters on gas-assisted injection molding, a mathematical model is presented which describes transient pressure and gasmelt interface development. The model is given on the basis of Hele-Shaw approximation and interface kinematics. Numerical simulations are implemented to calculate the pressure and the length of gas penetration by using Finite Element Method on a fixed mesh. Extensive molding experiments are performed at different processing parameters including the amount of melt injected into the mold, gas pressure and melt temperature. Finally, the influence of these parameters on the length of gas penetration is analyzed and discussed.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2008年第2期277-280,共4页
Journal of Materials Science and Engineering
基金
国家自然科学基金重大资助项目(10590353)
陕西省自然科学基金资助项目(2005A16)
关键词
气体辅助充填成型
工艺参数
有限元法
气体穿透
gas-assisted injection molding,processing parameter,finite element method,gas penetration
