| 摘要 |
PURPOSE:To prepare a radiator tank with complicated undercut portions in the form of a solid molded piece by injecting resin with a low-melting alloy core into a mold and then heating the molded piece to make the core to be melted and flow out. CONSTITUTION:In a radiator tank 3 with the L type liquid injecting hole 1 and the L type inlet pipe 2, undercut portions cannot be taken out by a mold of simple slide core structure. A low-melting alloy core with a specified shape, that has been provided in advance, is fixed in the mold to inject thermplastic resin. The core is taken out together with the molded piece, molded then heated in an oven. The core only is melted and allowed to flow away. Glass fiber charged with polyamide or thermoplastic resin such as noryl etc. is used for the material of the radiator tank. Lead-tin alloy, lead-tin-antimon alloy, etc. are used for the core. |
