| 摘要 |
This invention provides a punch blade formed with a burr inwardly projecting from an outer peripheral edge of a blade tip portion, wherein a film made of a coating liquid is formed inside a tip portion of the punch blade, a portion of the coating liquid forms a coating accumulation at the burr, and the film and the coating accumulation can form the inside of the outer peripheral edge and a periphery of the burr into smooth surfaces, so that a punch residue cut by the punch blade and the lower blade slides on the smooth surface of the film and a surface of the coating accumulation covering the burr, and falls downward, thereby providing the punch blade in which the punch residue does not remain in the blade tip portion with a simple structure.
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