B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 37/00 (2006.01) B21D 28/02 (2006.01) B21D 28/16 (2006.01) B21D 37/12 (2006.01)
Patent
CA 2639773
The invention relates to a method and a device for the production of stampings with almost smooth cutting and enlarged functional surface, especially fine blanking and/or forming a workpiece out of a flat strip, wherein the flat strip at closing is clamped between an upper part consisting of a shearing punch, a pressure pad for the shearing punch, an arranged on the pressure pad V-shaped projection and an ejector and a lower part consisting of cutting die, ejector and an inner form stamp and in the cutting zone is enforced a cut by shearing at high compressive stress, wherein the V--shaped projection has been pressed into the flat strip beforehand and a compressive stress acts on the flat strip to be cut. The invention has the task to avoid tears at cutting and functional surfaces of fine blanking parts by systematically controlling the state of stress in the cutting zone and at the same time to make it possible to economically and effectively realize the fine blanking of thicker parts with higher process security and reduced edge rollover. This task is solved by adjusting the state of stress in the cutting zone to a position oriented compressive stress from the beginning of the cutting process to its end by a movement slightly retarded with regard to the movement of the shearing punch additionally pressing in material in a direction almost perpendicular to the cutting direction by means of a tool element acting with controlled force depending on the part geometry and the thickness of the workpiece parallel to the cutting line between shearing punch and cutting die. Fig. 4 is to be designated as main drawing.
Hora Pavel
Schlatter Ulrich
Feintool Intellectual Property Ag
Riches Mckenzie & Herbert Llp
LandOfFree
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