| 摘要 |
PROBLEM TO BE SOLVED: To provide a core pin that can save cost while facilitating machining of the outer surface of the thin, long core pin and machining of a thin, deep cooling tube insertion hole.SOLUTION: The core pin includes a pin tip part 11 having a forming surface 11a projected into a cavity 1b of a die 1; a pin base end 13 having an opening 14 for inserting a cooling tube 21; and a cooling tube insertion hole 15 for guiding the cooling tube into the pin tip part from the opening. The whole core pin is divided into a plurality of divided members 26, 27, 28 in the length direction of the pin, and the tip divided member 26 including the pin tip part is formed with an outer peripheral fitting surface 12 fitted to a pin fitting hole 2 of the mold to perform positioning in the radial direction of the pin. The divided members other than the tip divided member are formed with a step part 13a abutting on a seat surface 3a of the mold to perform positioning in the length direction of the pin. |
