| 摘要 |
PROBLEM TO BE SOLVED: To suitably, efficiently injection mold a cylindrical article having a deep innermost side by forming a mold of an insert and a movable support means for supporting the insert through a thick air gap of a periphery of the insert, charging a molding material in the gap, and then charging a resin material in the gap formed by retracting the support means. SOLUTION: Fixed side and movable side cavities 1, 3 of a mold are connected to one another through a stripper plate 2, and a product cavity 1b to be charged with a resin material is formed between a columnar cavity 1d and a movable side insert 3a. In this case, a slide core pin 1c of a movable support means is projected into the cavity 1b by a controller 5 through an air cylinder 4, and a front end of a movable side insert 3a is supported before or after casting the resin material. The pin 1c is retracted before or after solidifying the resin material. Thereafter, the resin material is charged in a part in the cavity 1b in which the pin 1c is retracted, subsequently solidified to complete a cylindrical article.
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