PURPOSE: To execute the injection control in a die casting machine having simple hydraulic circuit and electric circuit and without influence to pressing force of molten metal by pressure variation, etc., of an accumulator.
CONSTITUTION: This device is a multistep device provided with a pilot servo valve 32 and main valve 31, further provided with a servo valve 30 in which a spool of the main valve 31 is four-way type guide valve, and by controlling the servo valve 30 with a control means 60, the injection control containing feedback control to the ultra low injection velocity and the low injection velocity as a matter of course, load compensation to the high injection velocity, the feedback control to the pressing force of molten metal, etc., is executed.
IWAMOTO NORIHIRO
MATSUDA YASUSHI
