| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold constituted so as to certainly fix a core piece or a core pin without caring the position of a medium passage or the like. SOLUTION: A columnar attaching groove 70 and an inverted truncated cone-shaped slip-off preventing groove largely expanded as compared with the opening cross section of the groove 70 at the leading end of the groove 70 are formed to the molding part 30 of a core 6. In the same way, a square pillar-shaped groove 80, and an inverted truncated pyramid-shaped slip-off preventing groove 81 largely expanded as compared with the opening cross section of the groove at the leading end (base end part) of the groove 80, are formed. A fixing part 73 is formed to the insertion side end of an almost square pillar-shaped core pin 72 and a fixing part 83 is formed to the insertion side end of an almost square pillar-shaped core piece 82. The core pin 72 and the core piece 82 are inserted in the attaching grooves 70 and 80 of the molding part 30 from a molding surface side and subsequently pressed to expand the fixing parts 73, 83 to enter the slip-off preventing grooves 71, 81, and the core pin 72 and the core piece 82 are fixed to the core 6.
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