| 摘要 |
PURPOSE:To obtain a hollow semispherical body whose quality is uniform, whose roundness is high and that has a three-layer structure, by rotating a core and/or a cavity of a mold for injection molding, and injecting a resin from a gate diverted from the central part of the mold. CONSTITUTION:A melted resin is injected into a molding space between a cavity 1 and a core 4 that is rotated via a driving shaft 12, gears 13, 14, and a main shaft 6 from a gate 3 diverted from the central part of the mold, turbulent flows are caused with the rotation of the core 4, and a hollow semispherical body is molded with a three-layer structure being formed due to the temperature difference between the cooled cavity 1 and an intermediate layer that is out of direct contact with the part directly engaged with the core 4. Then the rotation of the core 4 is stopped, and the molded item is removed by a stripper plate 15 and a stripper bush 16. Then this is sucked to perforated plate surfaces 19a, 20a by holders 19, 20 with vacuum sucking plates, shafts 21, 22 are rotated, an adhesive is added dropwise from an applicator 23 in the form of a needle, and the shafts 21, 22 are drawn together to join the open peripheries. |
