1. NC system failure
1. Hardware failure Sometimes the machine stops operating due to hardware damage in the NC system. For this type of failure, we must first understand the working principle of the NC system and the functions of each circuit board, and then analyze it according to the failure phenomenon, which can be used The exchange method accurately locates the fault point.
2. Soft faults Some faults of CNC cutting machine are caused by NC system parameters. The parameters may be changed or confused due to improper settings or some accidents.
3. If this kind of failure occurs, it can be solved by simply adjusting the parameters. When the NC system is accidentally in an endless loop state, the method of forced start is adopted to restore the use of the system.
2. Servo system failure
Since the control core of the CNC system is to digitally control the feed part of the cutting machine, the feed is realized by the servo unit controlling the servo motor and driving the ball screw; the rotary encoder is used as the position feedback element to form a semi-closed loop. position control system. Therefore, the role of the servo system on the CNC machine tool cannot be underestimated. When the servo system fails, we have to eliminate the faults of the servo control unit, servo motor, speed measuring motor, encoder, etc. one by one.
3. External failure
Nowadays, the reliability of CNC systems is getting higher and higher, and the probability of failures is getting lower and lower. Most of the failures are non-system failures and are caused by external factors. When an external failure occurs, we should first be familiar with the working principle and action sequence of the CNC cutting machine, and secondly use the PLC ladder diagram provided by the manufacturer skillfully, use the status display function of the NC system or use an external programmer to monitor the operating status of the PLC , according to the chain-lock relationship of the ladder diagram, to locate the fault point.