Process for determining the switchover point in the production of a die casting
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United States of America Patent
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-
Nov 30, 1999
Grant Date -
N/A
app pub date -
Mar 31, 1998
filing date -
Apr 23, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
For exactly determining the switchover point when producing plastic injection mouldings, two pressure sensors are arranged successively at intervals in the flow direction of the inflowing material, so that the material reaches them at different points in time, and pressure curves (p.sub.1, p.sub.2) are recorded inside the mould cavity. From the measured pressures, the differential pressure is derived. When passing from volumetric filing to compression, the pressures in the mould cavity (p.sub.1, p.sub.2) undergo an abrupt rise (U1, U2). This is reflected in a steep drop of the differential pressure formed, its gradient experiencing a change of sign (V). This indicates that the switchover point has been reached, at which the filling phase must give way to the holding pressure phase.
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