Metal cutting is an important part of industrial activities and has long been used in production processes. The metal cutting process uses cutting tools to remove excess material from the surface of the workpiece to form parts with dimensional accuracy, shape accuracy and surface quality. Therefore, the quality of the metal cutting directly determines whether the part is qualified. There are many things involved in the metal cutting process, such as chip formation and deformation, cutting force, heat and cutting temperature caused by cutting, wear mechanism and life of the cutting tool, vibration of the cutting process and surface quality of the workpiece, etc. All aspects affect the quality of the workpiece, processing costs, and so on. Nowadays, the development of the material industry and the cutting tools that adapt to various new materials are also emerging. Therefore, it is important to reduce the cost of metal cutting and improve the cutting environment while ensuring the cutting performance. In traditional metal cutting, a large amount of lubricating coolant such as cutting oil and cutting fluid is used. These lubricating coolants play a key role in metal cutting, which reduces the wear of cutting tools and removes a large amount of cutting on the other hand. Heat, for the purpose of protecting cutting tools and workpieces. However, the dangers caused by the extensive use of lubricating coolants have become increasingly prominent. The problems of high production costs, poor environment, high waste disposal costs, and occupational diseases caused by operators have led to a re-examination of the application of lubricating coolants.

The application of MQL to metal cutting is a new way of lubricating and cooling. It can reduce the processing cost and improve the processing efficiency. It can also be applied to the processing of many new materials, and the application environment of MQL technology is improved. The essence of MQL machining is that there is always a thin oil film between the cutting tool and the workpiece, which reduces the friction between the cutting tool and the workpiece and reduces the wear of the cutting tool. The main significance of MQL applied to metal cutting lies in the following points:
1. Reduce the cost of the machine tool and reduce the cost of purchase;
2. No need to use a large amount of cooling lubricant, which can further reduce the processing cost;
3. The power of MQL is compressed air, which is much smaller than the circulation system of cutting fluid in energy consumption;
4. The processing environment can be significantly improved;
5. Processing efficiency can become higher;
6. Occupational disease hazards can be eliminated.

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