MIM支持块的充模流动计算机模拟  

Computer simulation of die Filling process for a MIM part

作　　者：郭剑锋[1] 向华[1] 郑洲顺[1] 金贝[1] 曲选辉[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《粉末冶金技术》2005年第1期26-31,共6页Powder Metallurgy Technology

基　　金：国家杰出青年科学基金资助项目 (5 0 0 2 5 4 12 ) ;国家"973"计划资助项目 (G2 0 0 0 0 6 72 0 3);教育部博士点基金资助项目

摘　　要：以流体力学和热力学理论为基础 ,建立了充模流动过程的控制方程、初始条件和边界条件 ,并以支持块的充模流动为例 ,采用大型通用有限元软件ANSYS进行了计算机模拟 ,着重研究了浇口位置和浇口尺寸大小对压力场 ,温度场的影响 ,同时结合实验分析了转角处缺陷产生的机理。模拟结果表明 :当采用尺寸大小为 4mm的中间浇口进行注射时 ,可以得到良好的支持块预成形坯 ,与实验结果一致。The control equations, initial and boundary conditions for the die filling process of metal injection molding (MIM) were proposed on the basis of hydromechanics and thermodynamics. With ANSYS software, the die filling process of a complicated part was simulated. And the influence of position and dimension of the gate on pressure and temperature fields were studied. The cause for some defects appearing on the corners were analyzed based on the simulation results. The simulation results show that good green compacts of backup block could be made when the injecting gate is set at the middle position with dimension of 4 mm, which was proved by the experiments.

关 键 词：充模流动 浇口位置 压力场 大型 机理 计算机模拟 中间 MIM 温度场 实验分析 

分 类 号：TF124[冶金工程—粉末冶金] TQ320[冶金工程—冶金物理化学]