| 摘要 |
PURPOSE:To provide an injection mold with the capability of being removed without impairing the inner surface of an item after molding an item with a thread in the inner surface thereof. CONSTITUTION:The core 11 includes a pillar or cylindrical stationary core 15 and a cylindrical rotation core 16 rotatably mounted on the outer periphery of the stationary core, and a cavity forming surface is formed on one end side in the axial direction of these stationary core and rotation core, in which a female screw forming surface 19b for forming a female screw is made on the outer peripheral surface of the rotation core. |
