| 摘要 |
PURPOSE:To prevent the burr projecting from the plate thickness an to improve the assembling accuracy by forming a male blade higher than the upper face of a male die on the peripheral end face of the male die and making the male blade at the acute angle inclining to the inner side. CONSTITUTION:A male blade (a) is formed higher than the upper face of a male die on the peripheral end face of the male die A2 and composed so as to make the acute angle inclining to the inner side from the male die peripheral end face. In case of performing a blanking with this die,a plate stock is pinched by a plate presser 3 and elastic body 5 and bitten into the male blade (a) at the beginning of the blanking. The cutting blades of the male die A2 and female die 1 are then engaged to shear the plate stock. Since this shearing is caused from the apex of the groove by the blade a burr C is caused on a beveling part D and not projecting on the surface from a plate thickness T. Consequently the assembly accuracy is improved without the generation of the flaw by the burr C.
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