Abstract
Considering its working stability, semi-closed loop control is usually used in middle - grade CNC machine tool. But in the control，processing quality and machining precision are seriously affected by wear, hot variant, screw error and backlash of machine driven system. In order to improve them, reformation processing on closed-loop of Y axis in THWMZT-1B CNC milling machine is introduced, such as connecting and installing hardware, setting parameters and backlash compensating. After commissioning it is satisfying that repeated positioning accuracy can reach 0.001mm.
Highlights
X, Y, Z axis of THWMZT-1B type CNC milling machine were all controlled by means of semi-closed loop
In order to meet the needs of high-grade CNC equipment to maintenance personnel, to be familiar with the installation, the adjustment and the conversion between semi-closed loop and closed loop control, and to improve the machining accuracy, the semi-closed loop control of Y axis of THWMZT-1B CNC milling machine is transformed into closed loop control
Current control being used for stabilizing current of the motor is inner loop of servo control
Summary
X, Y, Z axis of THWMZT-1B type CNC milling machine were all controlled by means of semi-closed loop. FANUC servo system is a full digital servo system, and the axis card system in it is a sub-CPU system, which completes PID servo operation control of position, velocity, and current, and transmits PWM control signal to the servo amplifier to control the servo motor frequency conversion. It mainly consists of the following parts
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