With the continuous progress of science and technology, CNC machine tool has become an essential equipment in modern production, which involves the requirements of high precision, high speed and automation. In these aspects, the key is to ensure its stable operation. Therefore, this paper mainly analyzes the failure of CNC machine tools and researches the maintenance technology, and puts forward corresponding measures to reduce or avoid the economic and property losses and personal safety hazards caused by the accident; Improve the service life of CNC machine tools, extend work efficiency, extend tool life and reduce failure rate;<br>
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