| 摘要 |
PURPOSE:To prevent wear of a cavity and occurrence of a flash by a method wherein in a guide hole holding a cylinder part on the top of a core pin forming a hollow of a molded article, a guide member with a conical hole to be filled with a top conical part of the core-pin-top guide cylinder part is slidably provided. CONSTITUTION:In a mold 1, a guide hole 3 to which a core pin is guided to be positioned is so provided as to be connected to a cavity 2. On the top of the guide hole, a member 4 with a conical recess 4a is so disposed as to be slid by being urged by a resilient member 5. In the cavity 2, a core pin 7 for forming a hollow in a molded article is slidably disposed. In the vicinity of the top of the core pin 7, a guide cylinder part 8 to be fitted into the guide hole 3 is formed. The top of the guide cylinder part 8 is formed into a conical part 9 for the easy insertion thereof into the conical recess 4a of the guide member 4. In the process of closing the mold, the conical part 9 is fitted into the conical recess 4a upon completion of positioning the core pin 7. Furthermore, the guide cylinder part 8 is fitted into the guide hole 3, whereby the core pin 7 is completely positioned. |
