金属粉末动态注射成型充模过程的理论分析  

Theoretical Analysis of Filling Process in Metal-Powder Dynamic Injection Molding

作　　者：刘斌[1] 骆接文 彭满华 瞿金平 高威 

机构地区：[1]华南理工大学聚合物成型加工工程教育部重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2009年第3期38-42,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10590351)

摘　　要：基于连续介质理论和幂率模型,研究振动场对金属粉末喂料熔体充模过程的影响,建立了适合金属粉末喂料熔体等温填充中心浇口圆盘型腔的过程的物理模型和相应的数学模型,通过对数学模型的推导求解,得到了喂料熔体动态充模过程的速度分布方程、熔体前沿位置方程以及模腔入口压力方程.实验表明,在振动场作用下的熔体充模过程中,当平均注射流率不变且振动频率固定时,模腔入口处压力随振幅的增大而波动上升.理论计算的模腔压力值与实测值吻合较好,证明了理论计算的正确性.Based on the continuum theory and the process in metal injection molding is analyzed, and power law model, the effect of vibration field on the filling a physical model and the corresponding mathematical model, which are suitable for the isothermal feedstocks filling a center-gated disk-shaped mold under vibration field, are built. Then, by solving the mathematical model, the equations describing the velocity distribution, the edge posi- tion and the mold entrance pressure in the filling process are deduced. Experimental results indicate that, in the filling process with constant average injection flowrate and vibration frequency, the mold entrance pressure wavelike increases with the vibration amplitude. Moreover, it is found that the theoretical values of mold pressure accord well with the experimental ones, meaning that the theoretical calculation is correct.

关 键 词：金属粉末 动态注射成型 充模 

分 类 号：TF124[冶金工程—粉末冶金]