1. The tool does not return to zero after the program is run.

Generally, the control system fails. When the tool is feeding or processing, the servo motor runs at a low speed, and when the program returns to zero, it is required to return quickly. The servo motor runs at high speed and is driven by high voltage to increase the output torque. After the control high-voltage drive is damaged, the high-voltage power supply cannot be switched on when the high-speed return to zero, and the output torque of the servo motor is not enough, resulting in the tool not returning to zero. Replacing or repairing the drive, of course, does not rule out the damage or disconnection of the zero return switch.

2. The size error of the processed workpiece is very large.

One possibility is that the connection between the lead screw or nut and the lathe is loose. When idling, there is no cutting resistance, and the slide plate operates normally. During processing, due to the increase of cutting resistance, the connection between the lead screw or nut and the lathe is loose, resulting in the size drift of the processed workpiece. Fasten the connecting part, and the fault can be eliminated. Another possibility is caused by electric knife rest. If the tool holder cannot be locked automatically after changing the tool, and the tool deviates from the machining point during cutting, the above phenomenon will also be caused. At this time, check the tool holder locking device and tool holder control box. Of course, it does not rule out encoder or processing technology problems.

3. The local dimension error of the workpiece is large.

It is mainly caused by the excessive gap between the screw nut and the lead screw. Because the lead nut and lead screw operate in a certain section for a long time, the gap of this section is increased. At the beginning of the program, the measured lead screw clearance is compensated into the program, but it cannot be compensated in the wear section, so that the local dimension of the workpiece is out of tolerance. The solution is to repair or replace the lead screw, of course, it does not rule out the processing technology, cutting tools, temperature and other factors.

4. The processing program is often lost.

If the machining program is lost after the control system is powered off, and the machining program is re entered after the machine tool is powered on, and the machine tool can process normally, the backup battery voltage may be reduced or disconnected, resulting in the loss of the machining program in the data memory after the machine tool is powered off. Replace the backup battery. If the processing program is often partially or completely lost in the processing process, it is very likely that the machine tool data memory is faulty. At this time, the machine tool data memory can be replaced.

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