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1. Requirements for maintenance technicians of CNC machine tools

First, a strong sense of responsibility and good pursuit of professional ethics; Secondly, we must ensure that we have a wide range of knowledge, know computer technology, internet technology, analog and digital circuit technology, automatic control motor dragging technology, modern CNC machine tool detection technology and processing technology, and have a solid level of foreign language application; Thirdly, professional technical training should be carried out before employment, and the relevant CNC driving technology, PLC technology principle, CNC programming technology and programming language should be fully mastered; Finally, we should master all kinds of testing instruments and tools.

2. Be prepared for maintenance.

On-site maintenance is to diagnose the faults (mainly CNC parts) of CNC machine tools, find out the faulty parts, replace them with corresponding normal spare parts, and restore the normal operation of the machine tools. The key of this process is diagnosis, that is, detecting the system or peripheral lines, determining whether there is a fault, locating the fault and pointing out the exact location of the fault. From the positioning of the whole machine to the distribution frame, and even to the components in some cases. This is the main part of the whole maintenance work.

3. Field fault diagnosis

First, a preliminary diagnosis. When the field data of the fault is relatively comprehensive, the location of the fault can be judged by data analysis, or the fault can be preliminarily diagnosed by combining the interface signal method and the fault phenomenon, and then each part can be checked one by one according to the specific characteristics of the fault, and the fault can be preliminarily diagnosed. In the actual fault diagnosis process, sometimes only one method can be used to diagnose the fault, and sometimes it is necessary to comprehensively apply multiple detection methods to diagnose the fault. The diagnosis and identification of various fault points mainly depend on the operation characteristics and structural fault depth of the fault equipment; Secondly, alarm processing. Mainly divided into two types, one is the system fault alarm processing. When the CNC machine tool system fails, the corresponding alarm signal will appear on the display screen or operation panel, and then the maintenance personnel will deal with and eliminate the fault in combination with the fault operation manual. This alarm form is simple, strict and accurate, and maintenance personnel can combine different signals for targeted operation and processing. The second is the alarm and operation information processing of CNC machine tools. The application of PLC control in the manufacturing process of CNC machine tools displays some fault or operation information that can reflect the electrical control of machine tool interface with specific signs, and obtains more detailed fault judgment instructions through specific buttons. On the one hand, this alarm processing method can be processed by using the alarm manual, on the other hand, it can be combined with PLC program to check the corresponding signals and finally diagnose the fault. Finally, the fault handling of false alarm. When the PLC of the system can't run, the system has stopped or the system doesn't give an alarm, but it can't work normally, it is necessary to make an analysis and make a correct judgment based on the system state information before and after the fault.