| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing an inexpensive core, and a molding die for a core for attaching heat exchanger fins used therefor.SOLUTION: An aluminum billet 10 cut into a prescribed length is obtained. The aluminum billet 10 is set into the molding groove 11 of a lower die 1 which is formed into a cylindrical shape, in which a plurality of teeth grooves formed in the longitudinal direction of the inner wall and arranged in the circumferential direction are formed, and which has a sealed surface at the bottom. The aluminum billet 10 is pressed with the press drift 21 of an upper die 2. The deformed aluminum billet 10 is taken out from the molding groove 11 of the lower die 1. In this way, a core for attaching heat exchanger fin having a plurality of protruded teeth on the outer wall is formed. |
