MOLD ASSEMBLY OF INJECTION MOLDING MACHINE

摘要

PURPOSE:To efficiently vacuumize a cavity space and consequently reduce the time and energy necessary for vacuumizing operation by a method wherein a top force and a bottom force are temporarily stopped their relative movement movement just before the mold closing and the air in the cavity space is evacuated through the resultant gap. CONSTITUTION:When a movable top force 1 is lowered so as to move in close to a fixed bottom force 2 as near as the set distance S, a temporary stop position detector 16 detects said distance S and causes to stop the lowering of the movable top force 1 by means of a movable force stopping means 18. At this time, the movable top force 1 abuts against the sealing member 11 provided on the opening surface of the fixed bottom force 2 so as to form a vacuumizing gap 20 between both the forces and a cavity space 3 is brought into communication to the suction passage 12 of the bottom force 2 and simultaneously communicated to a vacuum source 15 by the changing-over of a change-over valve 14. When the cavity space 3 is vacuumized, the actuation of the movable force stopping means 18 is released by being timed with a timer 19, resulting in closing the solenoid change-over valve 14 so as to clamp the forces.