| 摘要 |
PROBLEM TO BE SOLVED: To obtain a continuous operation using a metallic mold so as not to develop the seizing and the galling even in the case of repeatedly working an ejector pin. SOLUTION: This metallic mold arranges a cavity in the interval between the lower metallic mold having a sprue hole and a gate part at the center part and the upper metallic mold arranged so as to be faced to the lower metallic mold, and also, is constituted of a gate cut-off pin disposed so as to be freely and vertically slid in the upper metallic mold faced to the gate part, an inside metallic mold disposed so as to be adjoined with the periphery of the gate cut-off pin, an outside metallic mold disposed at the outer periphery of the inside metallic mold and an upper backup mold for holding both of the inside metallic mold and the outside metallic mold. A tapered shape notching part opening the lower end part zone of the inner periphery of the inside metallic mold adjoined with the gate cut-off pin toward the cavity side, is arranged.
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