| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection mold generating no weld line. SOLUTION: The injection mold comprises at least a fixed mold 11 and a movable mold 12 and a membrane circular cavity 16 is formed between the fixed mold 11 and the movable mold 12 by clamping both molds 11 and 12. A gate port 14 is provided to the fixed mold 11 at the almost center of the surface facing to the cavity 16 thereof and a projection 15 is provided to the movable mold 12 at the almost center of the surface facing to the cavity 16 thereof to protrude up to the gate port 14 when the fixed mold 11 and the movable mold 12 are clamped. In the method for manufacturing the membrane circular body using the injection mold, the fixed mold 11 and the movable mold 12 are clamped and a molten metal is injected in the cavity 16 through the gate port 14 and, after the molten metal is cooled, the movable mold 12 and the fixed mold 11 are opened to take out a molded object.
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