B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 28/16 (2006.01) B21D 28/02 (2006.01) B21D 53/28 (2006.01)
Patent
CA 2639455
The invention relates to a method and a device for the production of a stamping with enlarged functional surface, especially fine blanking 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 a cutting die and an ejector and the V-shaped projection is pressed into the flat strip. The invention has the task to largely, systematically avoid the edge rollover by creating a rollover corresponding to the volume within the part geometry and at the same time maintaining the functional surfaces at thinner fine blanking parts and to save material, without material being shifted along the cutting line. This task is solved by carrying out at the untreated clamped flat strip before the cutting starts a negative with regard to the cutting direction preforming with a preforming element in the direction opposite to the cutting direction that corresponds to the expected edge rollover into the cutting die with regard to size and geometry at cutting including an allowance and generates a material volume at the side of the rollover in a mirror-inverted form and that in the beginning and during the cutting the preformed area of the clamped flat strip is supported by the preforming element.
Marti Andreas
Schlatter Ulrich
Feintool Intellectual Property Ag
Riches Mckenzie & Herbert Llp
LandOfFree
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