Point forming processes
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United States of America Patent
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May 28, 2019
Grant Date -
Nov 27, 2014
app pub date -
Aug 12, 2014
filing date -
Sep 17, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A progressive forming machine with die and tool units, one of said units sliding a limited distance along its axis and biased by a spring force towards the other unit, the units each having an end face with a smooth surface finish adapted to press against the smooth surface finish of the end face of the other unit, the end face area of one of the units being relatively small compared to its major cross-sectional area whereby a high contact pressure between the end faces is obtained for a given spring bias force such that extrusion/cooling oil coating a workpiece received in cavity portions is restrained from leakage from the cavity portions across said end faces during a hydrostatic trapped extrusion shaping the workpiece to a degree beyond limits of conventional cold-forming processes.
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