PURPOSE: To avoid causing impacts even when mold opening is started immediately after cooling at high speed by conducting an auxiliary mold opening operation right before the stationary mold and movable mold are spaced apart at the time of detecting resin infected into the mold, and performing mold opening after the completion of cooling, in a mold of the type that is opened and closed by a serve motor.
CONSTITUTION: When dwelling is complete to resin within a mold 40, a CPU 18 for a PMC causes a mold opening liner and a cooling liner to operate each for timing a lapse of time from the completion of dwelling and a cooling time, and arrival of the mold opening timer to a given lapse of time required to cure resin in within the mold 40 causes the CPU 18 to output a predetermined low speed mold opening command to a servo CPU 20 in order to drive-control a mold opening servo motor M1 for retracting the cross-head and conduct an auxiliary mold opening operation while absorbing mold clamping reaction forces so as not to produce impacts. Subsequently, as a set time of the cooling liner lapses and mold opening is started, impacts never occur even when mold opening is carried out at high speed because mold clamping forces of the mold 40 are released.
KAMIGUCHI MASAO
NEKO TETSUAKI
