Patent ID: 8097192

Claim:
An operating method for a foamed resin molding machine, comprising: providing a foamed resin molding machine including: a fixed die plate having a fixed die, a movable die plate having a movable die, and a die opening and closing device for opening and closing the movable die plate on the fixed die plate, wherein the die opening and closing device is composed of a toggle link disposed reversely between the movable die plate and a die tightening housing die thickness adjusting means for moving the die tightening housing and adjusting for a thickness of the tightened die, a cross head for bending and expanding the toggle link, and a motor-driven ball screw penetrating through the die tightening housing to be screwed into the cross head ball screw rotation control means for controlling a cracking gap and stopping the movable die at a cracking gap position when tightening and opening the die, wherein the cracking gap position is defined by a constant width parallel clearance between the fixed and movable die, and wherein the cracking gap position forms an exit route for air to escape at a constant air pressure, a cavity formed internal to the fixed and movable dies after the die is tightened to a die tightening limit, means for filling said cavity with material and applying steam through piping to the fixed and movable dies for a predetermined time period to expand and fuse the material in said cavity, and means for supplying cooling water through the piping to cool and solidify the material in said cavity, predetermining the die thickness by moving the die tightening housing by the die thickness adjusting means corresponding to the thickness of the tightened die, measuring the die tightening force at a-the die tightening limit, finely adjusting the die thickness by the die thickness adjusting means on the basis of the measured result, and once opening the die and then tightening the die again, by controlling the expansion of the toggle link by the ball screw rotation control means, thereby controlling the cracking gap position at the-a time of filling said cavity with materials and at a time of releasing the solidified material from said cavity, and wherein the die tightening limit is between 30 to 70% of the die tightening force realized during actual molding.