论文部分内容阅读
将金属粉末注射成形充模过程视为粉末、粘结剂和空气的三相流动过程,给出了金属粉末注射成形充模多相流动的控制方程。根据钳口复杂模腔的铁粉注射成形实际参数确定了充模多相流动控制方程的初边界条件,基于CFX计算流体力学软件对钳口铁粉注射成形充模多相流动过程实现了三维数值模拟。给出了钳口铁粉注射成形充模多相流动中固相粉末的速度流线图,分析了模腔中温度场和压力场分布的瞬态情况,以及模腔中不同位置的温度和压力随时间变化的曲线;分析了钳口铁粉注射成形充模多相流动过程中不同时刻粉末体积分数的分布情况。数值模拟结果可用于分析注射成形过程中产生粉末粘结剂两相分离和成形坯密度分布不均的原因,数值模拟为研究注射成形产品缺陷产生的原因提供了直观分析方法。
The filling process of metal powder injection molding is regarded as the three-phase flow process of powder, binder and air, and the governing equation of multiphase flow in metal powder injection molding is given. The initial boundary conditions of the multiphase flow control equations for filling were determined according to the actual parameters of the iron powder injection molding in the complicated cavity of the nip. The three-dimensional numerical simulation of multiphase flow in the filling process of the nodular iron powder injection molding based on the CFX computational fluid dynamics software was carried out. simulation. The velocity profile of solid powder in multi-phase flow in mold filling with nip iron powder was given. The transient distribution of temperature field and pressure field in the cavity was analyzed, and the temperature and pressure at different positions in the cavity With the passage of time. The distribution of powder volume fraction at different times during the filling multi-phase flow in the process of injection molding was analyzed. The numerical simulation results can be used to analyze the causes of the two-phase separation of the powder binder and the uneven distribution of the green density during the injection molding process. The numerical simulation provides an intuitive method for studying the causes of the defects of the injection molded products.