Patent ID: 6257313
Filing Date: 2001-07-10
Classification: B22D

Abstract:
A low pressure die casting system, comprising:a low pressure die casting machine, said machine including:a crucible that is adapted to hold a volume of molten metal, said crucible defining a space relatively above into which a pressurizing gas is introduced via a pressure port;a pair of dies for receiving and supporting cores, said cores serving as molds for forming a cast part;means for communicating molten metal from the crucible to the dies under influence of pressure developed in the space above the molten metal; and,a control system for controlling pressure in the space above the molten metal, said control system comprising:means for introducing pressurized air into said space;means for removing pressurized air from said space;means for storing a desired pressure versus time recipe;means for detecting pressure in the space above the molten metal;means for comparing the desired pressure provided by the pressure recipe to the detected pressure;means for terminating said casting cycle before an end of said casting cycle should said detected pressure deviate from said pressure recipe by a first predetermined amount.