Uses the booster ram scheme tightening device and the booster ram scheme tightening device the ejection compressed formation manner

摘要

PROBLEM TO BE SOLVED: To provide a booster ram type mold clamping apparatus wherein the amt. of a hydraulic oil fed in a main cylinder room is sufficiently ensured when mold clamping is actuated in injection compression molding. ;SOLUTION: In the midst of high speed mold closing operation based on hydraulic pressure of a booster cylinder room 31, a hydraulic oil is fed in a main cylinder room 27 by a line switching means to switch it to low speed mold closing operation and after a movable mold 22 is guided to an injection starting position and a resin material is filled in a molding cavity, a hydraulic oil from a hydraulic pump 46 and a hydraulic oil from a hydraulic regeneration means 74 are both fed in the main cylinder room 27 by the first communication/ shuttering means 76 to make mold clamping work and a flow rate control means 90 and a pressure control means 92 are provided to a feeding line of the hydraulic oil from the hydraulic regeneration means 74.;COPYRIGHT: (C)1997,JPO