Control device and control method for injection molding machine
AssigneeFanuc Corporation
InventorAtsushi Horiuchi
Life of this patent
Estimating the term…
Abstract
A control device for an injection molding machine including a cylinder into which a resin is supplied, and a screw that moves forward and rearward and rotates inside the cylinder, includes a suck back control unit that sucks back the screw based on a predetermined suck back speed and a suck back distance or a suck back time period, a pressure acquisition unit that acquires a pressure of the resin, a calculation unit which calculates a compensation amount of the suck back speed, based on a difference between the pressure of the resin at a time when sucking back is completed and a predetermined target pressure, and a speed determination unit that newly determines the suck back speed based on the compensation amount.
Claims12
A control device for an injection molding machine, the injection molding machine including a cylinder into which a resin is supplied, and a screw configured to move forward and rearward and rotate inside the cylinder, the injection molding machine being configured to perform metering of the resin while the resin is being melted inside the cylinder, by causing the screw to he moved rearward to a predetermined metering position while being forwardly rotated, the control device comprising a memory storing computer executable instructions, and a processor executing the instructions, the processor configured to execute the computer-executable instructions to cause the control device to:
- suck back the screw, based on a predetermined suck back speed and a suck back distance or a suck back time period, after the screw has reached the predetermined metering position;
- acquire a pressure of the resin from a sensor;
- based on a difference between the pressure of the resin at a time when sucking back is completed and a predetermined target pressure, calculate a compensation amount of the suck back speed that causes the pressure of the resin to reach the target pressure at a time when sucking back is performed based on the suck back distance or the suck back time period;
- newly determine the suck back speed based on the compensation amount;
- and
- send a control signal to the injection molding machine to instruct the injection molding machine to suck back the screw of the injection molding machine at the newly determined suck back speed.
A method of controlling an injection molding machine, the injection molding machine including a cylinder into which a resin is supplied, and a screw configured to move forward and rearward and rotate inside the cylinder, the injection molding machine being configured to perform metering of the resin while the resin is being melted inside the cylinder, by causing the screw to be moved rearward to a predetermined metering position while being forwardly rotated, the method comprising:
- sucking back the screw, based on a predetermined suck back speed and a suck back distance or a suck back time period, after the screw has reached the predetermined metering position;
- acquiring a pressure of the resin at a time when sucking back is completed;
- calculating, based on a difference between the pressure of the resin at the time when sucking back is completed and a predetermined target pressure, a compensation amount of the suck back speed that causes the pressure of the resin to reach the target pressure at a time when sucking back is performed based on the suck back distance or the suck back time period;
- and
- newly determining the suck back speed based on the compensation amount.
Dependencies are inferred from the claim text.