| 摘要 |
PURPOSE:To manufacture a molded product having a punched hole superior in view of an external appearance and function, by a method wherein the inside of a cavity is filled with molten resin through injection, the resin in a punching part is made into a specific thickness or less by performing primary punching action prior to cure of the molten resin and a thin part is blanked after cure. CONSTITUTION:After the inside of a cavity 10 is filled with resin, a solenoid valve S1 is excited prior to cure of the resin, a supply route of hydraulic oil is changed over, pressure is applied to a piston in the direction of an arrow so that the piston to a punching cylinder 3 is moved in a rightwise direction, a punch 5 is moved to the right and primary punching action is performed. Punching force and timing of the punching action is controlled so that a thickness delta of a thin part 16 based on the primary punching action becomes 0.2mm or less. Upon confirmation of cure of injected resin in the cavity, a solenoid valve S2 on a stationary mold 2 side is excited and a hole part of the inside of a cavity 10 which has been left behind as the thin part 16 is formed by means of a punch 5. |
