Method and device for pressure control of electric injection molding machine
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United States of America Patent
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Issued Date -
Jul 6, 2006
app pub date -
Sep 13, 2004
filing date -
Sep 17, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A rotational angle of a motor operative to propel forward a screw in an injection molding machine is detected at an encoder. An output from the encoder is employed to obtain an angular velocity .omega. of the motor. From the obtained angular velocity .omega., an estimated melt pressure value .delta. that contains no differential term is derived using a certain observer theory. The estimated melt pressure value .delta. is employed to calculate a torque command value T.sup.CMD for the motor, which is fed back to the motor. Thus, precise propelling power control unaffected by noises can be executed without the use of a pressure sensor such as a load cell.
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