Patent ID: 6148902
Filing Date: 2000-11-21
Classification: B22D

Abstract:
A method for reducing pressure in casting cavities of more than one preselected die casting machine using a single pressure reducing source comprising the steps of:providing a plurality of die casting machines, each machine providing signals based upon a die casting operating cycle;providing a pressure reducing source;providing a valve for each of said plurality of die casting machines, said valves for communicating the casting cavities of said plurality of die casting machines with said pressure reducing source;selecting some of said plurality of die casting machines to be subject to pressure reduction;communicating said signals from one of said plurality of preselected die casting machines to a first receiving element;communicating signals from said first receiving element to a controller;communicating signals from said controller to said pressure reducing source;reducing pressure in the casting cavity of said one preselected die casting machine;communicating said signals from another of said preselected die casting machines to a second receiving element;communicating signals from said second receiving element to said controller;communicating signals from said controller to said pressure reducing source; andreducing pressure in the casting cavity of said other preselected die casting machine.