JPS57202933A - Blanking die - Google Patents

Abstract

PURPOSE:To obtain a blanking die with a low production cost, by providing a cutting blade having a sharp edge on only one of top and bottom dies, which are provided with shearing blades for cutting a work, crosswise to the shearing blade of the other die and cutting the scrap into pieces only by this cutting blade. CONSTITUTION:When a work 17 is put on a bottom die 26 and a top die 14 is allowed to fall together with a slide S to be brought near the bottom die 26, a pad 10 presses and fixes a goods part of the work 17 to a die 16. By the fall of the slide S, the lower- most part of an edge 33 of a cutting blade 32 attached to a punch 3 cuts one end part of the center of the part to be blanked of the work 17. This part to be blanked is blanked by a shearing blade 4 of the punch 3 and a shearing blade 18 of the die 16, and scraps 21 cut into pieces are discharged to the outside of the die through a part 25. Meanwhile, simultaneously with cutting of said blade 32, the die inside end part of an edge 35 of a shearing blade 34 attached to a sectional die 8 cuts the outside circumferential part of the work 17. After the outside circumferential part of the work is cut radially by the blade 34, a shearing blade 9 of the die 8 and a shearing blade 19 of the die 16 cooperate with each other to cut the outside circumferential part of the work from the goods part.