The application of CNC machine tool maintenance has not only brought revolutionary changes to the traditional manufacturing industry, making the manufacturing industry a symbol of industrialization, but also with the continuous progress of CNC technology and the expansion of application fields, he has a point on the livelihood of the national economy and people's livelihood. The progress of important industries (IT, transportation, light industry, medical care, etc.) plays an increasingly important role, as the digitization of equipment required by these industries has become a major development direction of modern progress.

The key to the maintenance of CNC machine tools is fault diagnosis, that is, the search for fault sources and fault location. Generally speaking, different fault diagnosis methods are used according to different fault types. These parts of the CNC machine tool will inevitably have different degrees and types of failures due to various reasons, causing the CNC machine tool to not work normally. These factors generally cover: mechanical corrosion, wear and failure, aging, destruction and failure of components, electrical components, poor connector contact, background fluctuations such as current or voltage fluctuations, temperature fluctuations, hydraulic pressure and flow Stirring and oil pollution, random interference and noise, software procedures lost or damaged, etc.