Injection device and control method
AssigneeFanuc Corporation
InventorsTakuya OSAWA, Shoutarou SEKIGUCHI
Life of this patent
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Abstract
An injection device according to one embodiment of the present invention monitors the linear torque of a linear motor and the rotary torque of a rotary motor using a first detection unit for detecting the linear torque and a second detection unit for detecting the rotary torque while controlling the linear motor and the rotary motor so that a bush is spline-fitted to a screw.
Claims11
An injection device comprising a screw disposed along a forward and rearward direction including a forward direction in which an injection resin is injected and a rearward direction opposite to the forward direction, and a bush formed so as to be spline-fitted to the screw, the injection device causing the screw and the bush to be spline-fitted to each other, the injection device further comprising:
- a linear motion motor configured to move the bush forward and rearward in the forward and rearward direction with respect to the screw;
- a rotary motor configured to rotate the bush with respect to the screw;
- a first detection unit configured to detect a linear motion torque of the linear motion motor;
- a second detection unit configured to detect a rotational torque of the rotary motor;
- and
- a motor control unit configured to execute a control process of controlling the linear motion motor and the rotary motor while monitoring the linear motion torque and the rotational torque in a manner so that the bush is spline-fitted to the screw.
A control method executed by an injection device,
- wherein the injection device includes:
- a screw disposed along a forward and rearward direction including a forward direction in which an injection resin is injected and a rearward direction opposite to the forward direction;
- a bush formed so as to be spline-fitted to the screw;
- a linear motion motor configured to move the bush forward and rearward in the forward and rearward direction with respect to the screw;
- a rotary motor configured to rotate the bush with respect to the screw;
- a first detection unit configured to detect a linear motion torque of the linear motion motor;
- and
- a second detection unit configured to detect a rotational torque of the rotary motor, and
- in the control method, the injection device controls the linear motion motor and the rotary motor while monitoring the linear motion torque and the rotational torque in a manner so that the screw and the bush are spline-fitted to each other, the control method comprising:
- a rotation and forward movement step of moving the bush forward while rotating the bush with respect to the screw;
- a rotation stopping step of stopping rotation of the bush when the rotational torque exceeds a rotational torque threshold;
- and
- a forward movement stopping step of stopping forward movement of the bush when the linear motion torque exceeds a linear motion torque threshold.
A control method executed by an injection device,
- wherein the injection device includes:
- a screw disposed along a forward and rearward direction including a forward direction in which an injection resin is injected and a rearward direction opposite to the forward direction;
- a bush formed so as to be spline-fitted to the screw;
- a linear motion motor configured to move the bush forward and rearward in the forward and rearward direction with respect to the screw;
- a rotary motor configured to rotate the bush with respect to the screw;
- a first detection unit configured to detect a linear motion torque of the linear motion motor;
- and
- a second detection unit configured to detect a rotational torque of the rotary motor, and
- in the control method, the injection device controls the linear motion motor and the rotary motor while monitoring the linear motion torque and the rotational torque in a manner so that the screw and the bush are spline-fitted to each other, the control method comprising:
- a rotation and forward movement step of alternately repeating a forward movement operation of moving the bush forward for a first specified time and a rotation operation of rotating the bush for a second specified time;
- a forward movement step of continuing to move the bush forward when the rotational torque exceeds a rotational torque threshold during the forward movement operation or the rotation operation;
- and
- a forward movement stopping step of stopping forward movement of the bush when the linear motion torque exceeds a linear motion torque threshold.
Dependencies are inferred from the claim text.