Patent ID: 6024158
Filing Date: 2000-02-15
Classification: B22D

Abstract:
A process for the production of die castings from a light metal alloy having a limited iron content, which in the molten state is fed under gravity into a casting chamber in a die casting machine, and whence forced by a plunger into a mould chamber which undergoes controlled evacuation in accordance with the position of said plunger, comprising the steps of:applying a parting compound selected from the group consisting of an alkali halide to which anti-corrosion additives are added up to a pH value of at least 8, or graphite powder of a particle size of between 1 and 1.5 .mu.m to at least one mould half, applying a lubricant to the plunger wherein the light metal alloy consists of a primary alloy of invariable composition, with a limit placed on the proportions of Cu, Fe and Zn; which alloy undergoes de-gassing and/or filtration before being introduced, the vacuum in the mould chamber is below 50 mbar when the molten alloy is introduced.