| 摘要 |
PURPOSE:To prevent the occurrence of weld lines and cracks, while simplifying and compacting the structure by a method in which a slide core is energized by a spring in the direction into which mold part is retracted from the inside of a mold, and an operating pin moving the slide core is provided. CONSTITUTION:At the state where a stationary mold 1 and a movable mold 2 are opened, mold part 5 is not positioned in a cavity 3, which a slide core 4 is retreated by a spring 6. At this state, the cavity 3 is filled with the molding material A of thermosetting resin, and when the movable mold 2 is raised, mold clamping is gradually carried out, whereby the molding material A is fully applied in the cavity 3. When mold clamping is continued, an operating pin 7 is inserted into an inserting hole 16, and when the tip of taper part 15 reaches the slide core 4, the mold part 5 projects into the cavity 3, while the sliding core 4 slides against the spring 6 with the sliding contact of the taper part 15 and a taper hole 18. When mold clamping is finished, the taper part 15 is fitted into the taper hole 18, and then the mold part 5 projects by a specified amount, and thus a product B is molded. With this device occurrence of mold lines and cracks is prevented. |
