| 摘要 |
An exemplary punch die ( 200 ) for making a high quality cut surface ( 301 ) on a metal workpiece ( 31 ) includes an upper die ( 21 ) and a lower die ( 22 ). A burnish occupies 90% of the whole cut surface. A cutting clearance between the upper die and the lower die is 0.5% T or less, T is thickness of the metal workpiece. A method for making a high quality cut surface on a metal workpiece includes: providing a lower die, and mounting a metal workpiece on the lower die; providing an upper die, and a cutting clearance between the upper die and lower die is 0.5% T or less, T is thickness of the metal workpiece; and forming a cut surface on the metal workpiece by the upper die and the lower die, and the burnish occupies 90% of the entire cut surface.
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