| 摘要 |
PROBLEM TO BE SOLVED: To shorten a process time of one cycle of a core casting apparatus without increasing the number of processes and to enable the arrangement of a resin injection molding apparatus and the core casting apparatus in a ratio of 1:1. SOLUTION: When a metal core having a thick-walled portion and a thin- walled portion is molded by casting, a core material core 13 comprising a metal having the same component as a metal of the metal core, for example, a core 11 for an intake pipe part or core 12 for a surge tank part in a drawing 1 is preformed to be prepared and this core is cast in the thick-walled part, for example, the core 12 for the surge tank part in the drawing 1.
|
