Method and device for the production of a stamping with almost smooth cutting and enlarged functional surface
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United States of America Patent
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Jan 27, 2015
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app pub date -
Sep 26, 2008
filing date -
Sep 26, 2007
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Abstract
A method and device for production of stampings with an almost smooth cutting and enlarged functional surface, especially fine blanking and/or forming a workpiece out of a flat strip, wherein flat strip is clamped between an upper part consisting of a shearing punch, a pressure pad, a V-shaped projection and an ejector arranged on the pressure pad, and a lower part consisting of cutting die, ejector and an inner form stamp. By adjusting the state of stress in the cutting zone to a position oriented compressive stress by movement slightly retarded with regard to movement of the shearing punch additionally pressing in material in a direction almost perpendicular to the cutting direction by a tool element acting with controlled force depending on the part geometry and thickness of the workpiece parallel to the cutting line between shearing punch and cutting die, tears at cutting and reduced rollover are achieved.
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