MODEL TESTING OF CASTING PROCESS IN COLD-CHAMBER DIE CASTING MACHINE

摘要

Investigations of filling the model mould cavity (with perpendicular walls) of the casting die by model liquids of various density and viscosity are presented in the paper. Influence of localisation of the inlet system and inlet velocity on the flow character of model liquids of different viscosity in the system of a cold-chamber casting die was tested. Two Newtonian liquids were used as model liquids. They were obtained by adding the proper amount of water to glycerine, one liquid had a viscosity equal 1.39 cSt, corresponding to the viscosity of the liquid aluminium alloy, while the other 9.46 cSt. Observations of the filling process and the piston movement in the chamber recorded by filming constituted the bases for the estimation of the influence of the inlet velocity on the process of casting die filling - with taking into account the pressure, both in the pressing chamber and in the mould. A comparison of the experimental results with the calculated from the Reynolds Number for various viscosities and dimensions of inlet gaps was performed.