Method for hot pressing of workpieces
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United States of America Patent
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-
Sep 11, 2001
Grant Date -
N/A
app pub date -
Oct 19, 2000
filing date -
Apr 24, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hot-forming machine for the hot-pressing of workpieces comprises a die (5), an associated extendable and retractable ejector (7) and a forwardly and backwardly movable press ram (1). The ejector (7) is connected to a control piston (8) arranged displaceably in a pressure chamber (28). Liquid can flow out of the pressure chamber (28) via a liquid outlet bore (24) and a liquid discharge line (23). By means of a throttle (25) arranged in the liquid discharge line (23) the outflow of liquid and therefore the repulsion of the extended ejector (7) by the forwardly moving press ram (1) are delayed in such a way that a workpiece (4) arranged between ejector (7) and press ram (1) is pre-upset and descaled outside the die (5).
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