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AssigneeFanuc Corporation
InventorsJunpei MARUYAMA, Satoshi TAKATSUGI
Estimating the term…
Torques and resin pressures applied to a screw are detected during the forward movement of the screw and coefficients of correlation between the detected torques and resin pressures are calculated. When the check ring is open, the flight of the screw receives resin pressure, and the screw torque increases proportionally to the resin pressure due to resin backflow, so the coefficients of correlation between the screw torques and the resin pressures are higher than a reference value. When the check ring closes, the flight of the screw no longer receive resin pressure, so the screw torque decreases and the coefficients of correlation become lower than the reference value. The check ring is determined to be closed when the coefficients of correlation become lower than the reference value.
An injection molding machine having a screw equipped with a check ring, axial driving means for driving the screw in a axial direction of the screw, rotational driving means for rotating the screw, torque detecting means for detecting a torque applied to the screw, and resin pressure detecting means for detecting resin pressure, the injection molding machine comprising:
A method for determining the time point at which a check ring closes in an injection molding machine, the injection molding machine comprising a screw equipped with a check ring, axial driving means for driving the screw in an axial direction of the screw, rotational driving means for rotating the screw, torque detecting means for detecting torques applied to the screw, and resin pressure detecting means for detecting resin pressures, the method comprising the steps of:
Dependencies are inferred from the claim text.