| 摘要 |
PROBLEM TO BE SOLVED: To blank a good punched part in high productivity without clogging a die hole with scrap when blanking an extremely small hole or a soft/viscous material and without damaging a punch/die by arranging thermosetting resin on the inner wall of a die hole. SOLUTION: A punch 1 is advanced/retreated in a die hole 3, a small diameter through-hole is blanked to a material 4 to be blanked. A temp. of the punch 1 and the die hole 3 is raised by blanking, but since there is a thermosetting resin 5 in the die hole, a blanked scrap 6 is not seized and is successively slid down in each blanking. The position to arrange the thermosetting resin 5 is lower than the bottom dead center of the punch 1, it is preferable to arrange the thermosetting resin 5 through a sleeve by coating. The thermosetting resin 5 is preferably fluororesin, polyether chloride, cellulose, ester or polyamide.
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