Patent ID: 7017649
Filing Date: 2006-03-28
Classification: B22D

Abstract:
1. A die casting machine for exhausting a cavity defined between a pair of dies to reduce the pressure in the cavity and for injecting and filling a molten metal into said reduced pressure cavity to form a cast product, comprising: a valve for opening and closing an exhaust path for exhausting the inside of said cavity; a value operation detecting means for detecting an opened state or closed state of said exhaust path by operation of said valve; an injection apparatus including an injection sleeve in communication with said valve, an injection plunger for injecting the molten metal supplied to said injection sleeve, and a drive means for driving said injection plunger; a plunger position detecting means for detecting a position of said injection plunger; and a control means including said injection controlling means outputting control instructions to the valve control means for closing the valve so as to close said exhaust path when the position of said injection plunger detected by the plunger position detecting means reaches a valve closing position defined by the cast condition before reaching said speed switching position, and to the drive means in the injection apparatus for stopping the drive of said injection plunger when the valve closed position determining means does not detect completion of closure of said exhaust path when said injection plunger reaches said speed switching position.