Process and device for hydraulic drive of injection molding machines
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United States of America Patent
Stats
-
Jan 30, 2001
Grant Date -
N/A
app pub date -
Dec 18, 1995
filing date -
Feb 9, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An acceleration pressure is used as set value for the movement of the mass which is to be shifted, such as the mold clamping unit in an injection molding machine. For this purpose it is proposed to use preferably an electrically modulated pressure control valve for the pressure regulating device in the pressure drive system. Even with extremely short acceleration periods resonance oscillations are avoided, which until now prohibited the reduction of the acceleration period. With computing devices the movement of the mass can now be really controlled in relation to a selected velocity profile and/or a position profile or at least a part thereof.
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