Method for controlling drive of screw in injection molding machine
AssigneeSumitomo Heavy Industries, Ltd.
InventorKazuo Hiraoka
Life of this patent
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Abstract
The present invention is applicable to an injection molding machine comprising an injection device having a servo motor for use in rotating a screw and a controller for controlling the servo motor. The controller has a rotation speed N previously set therein as a set value for the screw rotation in a metering process. The controller rotates the screw at an acceleration A1 until the rotation speed of the screw reaches a value NK (where NK<N). After that the controller carries out a control operation to rotate the screw at an acceleration A2 until the rotation speed of the screw reaches the value N. The acceleration A2 is higher than the acceleration A1.
Claims13
A method for controlling drive of a screw in an injection molding machine, said method comprising the steps of:
- providing an injection device having a driving source for rotating the screw and a controller for controlling the driving source, wherein the controller has a rotation speed N which is previously set therein as a set value at which the screw is rotated in a metering process;
- said method further comprising the steps of
- first rotating the screw at a first acceleration A1 until the rotation speed of the screw reaches a value NK, where NK<N;
- second rotating the screw at a second acceleration A2 until the rotation speed of the screw reaches the rotation speed N, second acceleration A2 being higher than first acceleration A1, the value NK being defined at a predetermined certain ratio K relative to said rotation speed N.
A method for controlling drive of a screw in an injection molding machine, said method comprising the steps of:
- providing an injection device having a first driving source for use in rotating the screw;
- a second driving source for use in moving the screw in the axial direction via an injection shaft;
- a position detector for detecting a position of the screw;
- and a controller for controlling said first driving source in accordance with a value indicative of the detected position supplied from the position detector;
- providing rotation speeds Ns and Ne which are previously set in the controller as set values at which said screw is rotated at the beginning and end, respectively, of a metering process;
- interpolating the rotation speed of the screw throughout the metering process from the beginning to the end based on the rotation speeds Ns and Ne and the value indicative of the detected position supplied from said position detector;
- and
- controlling the rotation speed of the screw throughout the metering process from the beginning to the end based on the rotation speeds Ns and Ne and the value indicative of the detected position supplied from said position detector.
Dependencies are inferred from the claim text.