INJECTION FOAM MOLDING MACHINE AND INJECTION FOAM MOLDING METHOD

摘要

PROBLEM TO BE SOLVED: To prevent the occurrence of a swirl mark or silver by suppressing the entering of a foaming gas or air into the gap between a molded product and a mold. SOLUTION: A first changeover means is connected so as to be changed over to a state that the connection of a first hydraulic chamber and a second hydraulic chamber is cut off, a state that hydraulic oil is supplied to the first hydraulic chamber of each of hydraulic mold clamping cylinders and the second hydraulic chamber is connected to a no-pressure oil discharge side and a state that hydraulic oil is supplied to the second hydraulic chamber of each of the hydraulic mold clamping cylinders and the first hydraulic chamber is connected to the no-pressure oil discharge side. A second changeover means is installed between the first hydraulic chambers of two sets of the diagonally arranged hydraulic mold clamping cylinders among four sets of the hydraulic mold clamping cylinders and the first changeover means to be connected so as to be capable of being changed over to the state that the first hydraulic chamber is connected to the no-pressure oil discharge state and a hydraulic oil supply state and two sets of mechanical means for synchronously moving the rams of two sets of the diagonally arranged hydraulic mold clamping cylinders in the direction of the first hydraulic chamber. COPYRIGHT: (C)2006,JPO&NCIPI