| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding machine capable of almost linearly moving a punch when the punch is returned to the position in front of an opening after the opening is formed using the punch. SOLUTION: A molten resin material is injected in the molding cavity formed by a mold 15 to perform mold clamping and a gate cutting punch 21 is adapted to the resin material to form the opening. Air pressure or oil pressure is used when the gate cutting punch 21 is moved in the direction opposite to the moving direction at the time of opening after the opening is formed to allow force to act on a piston 23. |
