| 摘要 |
PURPOSE:To injection mold a molding with a thin-walled section partly with good efficiency by appropriately slidably adjusting a sliding block provided partly in a mold and adjusting the shape of a cavity space. CONSTITUTION:A thick-walled section of a molding is formed by sliding a sliding block 9 provided in a mold 1. Under the start that a sliding block 9 is in the recessed position, molten synthetic resin, slightly more than the quantity necessary for molding the product is injection molded from a gate 7 opened in a space 4 into the cavity space 4. Then, the sliding block 9 is moved forward to the cavity space 4 before the resin is solidified. The resin corresponding to the thick-walled section is pushed away to the surrounding area of the sliding block 9. As the cavity space 4 is filled with resin and the volume is reduced, the surplus resin is discharged out into a recessed section formed in connection with the space 4. When the sliding block 9 reaches a most advanced position, a given thick-walled section is formed between the front end surface of the same and the cavity space 4. |
