Method of controlling injection molding machine with hydraulic loads
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United States of America Patent
Stats
-
Mar 3, 1992
Grant Date -
N/A
app pub date -
Jun 14, 1990
filing date -
Jun 14, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An injection molding machine for manufacturing plastic moldings contains a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores. A plurality of the pumps are respectively connected to the hydraulic loads. At least one alternating-current servomotor is provided for driving the pumps. In a method of controlling hydraulic drives of the foregoing machine, the measured value of a subassembly is detected and compared with a desired value; any deviation detected thereby is converted into a desired velocity value. The speed of rotation of an associated motor is then adjusted, via a servodrive module, in response to the mentioned desired velocity value.
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