| 摘要 |
PURPOSE:To mold a hollow article and another part integrally by a method wherein another part is buried simultaneously into a core material, which is manufacture by coagulating melted salt and foundry sand, and molded, the core is set to an injection molding die and injection molding is conducted and the core is eluted after molding. CONSTITUTION:A check valve 8 as another part, which is the mixture of the water-soluble melted salt and the foundry sand and is mounted to the hollow body, is completely buried into the core. The core 11 manufactured in this manner is set to the injection molding die, plastic is injected into a sprue 34, and a space section 31 is filled with plastic through a gate 32. The hollow body and another part are integrally molded, shape is extracted, and the mixture of the water-soluble melted salt and foundry sand is removed through water treatment, thus obtaining a casing 10, into the hollow section thereof the check valve 8 is integrally molded. |
