Abstract:

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.

Key words: metal powder, dynamic injection molding, mold filling