Mim Filling Flow 3d Computer Simulation

In this paper, the control equations, initial and boundary conditions for the mold filling process are proposed, by assuming that feedstock melt is non-Newtonian and incompressible continuum-flow on the basis of analyzing the mold filling process of metal injection molding, and of the theories of hydromechanics and thermodynamics. According to the above, the paper uses the finite element analysis software -ANSYS to solve the equations and realize the 3D computer simulation of the mold filling process.The simplified Power-Law viscosity model in FLOTRAN was rectified and re-compiled by taking advantage of the second development function of ANSYS and temperature parameter was added. The new model, which is proved to be correct by the experiments, was used to perform all the 3D computer simulation.Take cemented carbide I part for example. By employing the Z-Buffer section of ANSYS, the paper illustrates the 3D simulation of cemented carbide feedstock filling simple cavity, discusses the effects of the inlets position, inlets size, wall temperature and predicts the conditions for some defects which often appear in the process of the metal powder injection molding .The results show that good green compacts of cemented carbide could be made if the volume flow velocity is selected 60cm3/s when the wall temperature and the injection temperature are set at 300K and 400K respectively with lateral injecting inlet in size of 4 x1 mm2, which was proved by the experiments.What is more, the paper also illustrates the 3D simulation of the process of filling a complicate cavity, the positions of defects are predicted and mechanism is discussed. Prior to the practical production, the die filling behavior of new inlets were simulated. Finally, the paper recommends the INLET4 as the optimal injection position. Good products that have passed through the acceptance check of relative department are made according to the simulation results. At the same time, the paper brings forth the applied prospect of the 3D simulation of the die filling process.