| 摘要 |
PURPOSE:To prevent the generation of the burr and shear drop of a product and rising of punched residue by forming the notch with the contout aligned with the shape to be punched in advance on the blank stock prior to being punched by the die set for punch. CONSTITUTION:A notch m2 is formed along the contour aligned with a punching shape on the front and back faces by a die 1 and blade 3 after positioning the blank stock m which is fed between the die 1 for engraving and the blade 3 for engraving The blank stock m is then transferred to the succeeding punching stage by a liftr, etc. together with the ascent of the blade 3. With the contour of the notch m2 being located at the lower part of the punch 4 for punching, then, the punch 4 descends to puch the blank stock m and to push the punching residue into the inner hole 5 of the die 2 for punching as well. In this case the blank stock(m) is sheared along the notch m2, so no burr and drop are caused on both faces. The punched residue is pressed and deformed by the contact part 6 of the taper part after passing it and no cutting residue is caused by the friction pressure of the contact part 6 and peripheral edge part thereof.
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