Controller of injection molding machine
AssigneeFanuc Corporation
InventorsHiroshi Watanabe, Tatsuhiro Uchiyama, Wataru Shiraishi, Satoshi Takatsugi
Life of this patent
Estimating the term…
Abstract
A screw is rotated at a set speed and retreated by performing back pressure control for keeping a resin pressure at a set pressure. When the retreat position of the screw reaches a change point set nearby a set metering completion position, the back pressure control for keeping the resin pressure at a set resin pressure is stopped. A command for positioning the screw at a metering completion position is output to position the screw at the metering completion position. At the same time, when a screw position reaches the change point, the screw is reversed by a set value at a set speed.
Claims17
A controller of an injection molding machine for controlling a back pressure and retreating a screw or a plunger up to a set metering completion position while rotating the screw at a set rotational speed, comprising:
- means for advancing or retreating the screw or plunger;
- means for rotating the screw;
- means for detecting the position of the screw or plunger;
- means for detecting a resin pressure;
- back pressure feedback control means for controlling the means for advancing or retreating the screw or plunger so that a detected resin pressure coincides with a set resin pressure;
- means for stopping the back pressure feedback control by the back pressure feedback control means when the screw or plunger reaches a set change point before the screw or plunger reaches a metering completion position and moving the screw or plunger up to the metering completion position;
- and
- means for reversing the screw when the screw or plunger reaches the set change point.
A controller of an injection molding machine for controlling a back pressure and retreating a screw or a plunger up to a set metering completion position while rotating the screw at a set rotational speed, comprising:
- means for advancing or retreating the screw or plunger;
- means for rotating the screw;
- means for detecting the position of the screw or plunger;
- means for detecting a resin pressure;
- back pressure feedback control means for controlling the means for advancing or retreating the screw or plunger so that a detected resin pressure coincides with a set resin pressure;
- means for stopping the back pressure feedback control by the back pressure feedback control means when the screw or plunger reaches a set change point before the screw or plunger reaches a metering completion position and moving the screw or plunger up to the metering completion position;
- and
- means for reversing the screw when a preset screw or plunger retreat speed is detected by the means for detecting the retreat speed of the screw or plunger.
A controller of an injection molding machine for controlling a back pressure and retreating a screw or a plunger up to a set metering completion position while rotating the screw at a set rotational speed, comprising:
- means for advancing or retreating the screw or plunger;
- means for rotating the screw;
- means for detecting the position of the screw or plunger;
- means for detecting a resin pressure;
- back pressure feedback control means for controlling the means for advancing or retreating the screw or plunger so that a detected resin pressure coincides with a set resin pressure;
- means for stopping the back pressure feedback control by the back pressure feedback control means when the screw or plunger reaches a set change point before the screw or plunger reaches a metering completion position and moving the screw or plunger up to the metering completion position;
- and
- means for reversing the screw when a resin pressure exceeding a preset resin pressure is detected by resin pressure detecting means.
Dependencies are inferred from the claim text.