| 摘要 |
PURPOSE:To prevent casting defect caused by insufficient sticking to mating face in divided molds by holding a core into cavity in a lost foam pattern forming mold, packing foam beads into the cavity and obtaining foaming resin- made lost foam pattern containing the core. CONSTITUTION:The core 6 is set in the forming metallic mold 7 and the prefoamed polystyrene beads 18 are packed into the cavity 9 from a beads injecting hole 10 arranged in a metallic mold flask 8a. Steam is introduced into a chamber 17 and the core 6 and the beads are heated from outside of the metallic mold 7 to foam the beads and the foamed polystyrene pattern 11 is formed so as to enclose the core 6. At the time of filling the foamed polystyrene in the cavity 9 in the metallic mold 7, the cooling water is introduced in the chamber 17 and the core 6 to cool the pattern 11 through the metallic mold 7. After that, the metallic mold 7 is released to obtain the lost foam pattern 11 integrally containing the core 6 in inner part. |
