Metal cutting is an important part of industrial activities and has long been used in production processes. The process of metal cutting is to use cutting tools to remove excess materials from the surface of the workpiece to form parts with certain dimensional accuracy, shape accuracy and surface quality. Therefore, the quality of metal cutting directly determines whether the part is qualified. In the metal cutting process, there are many contents involved, such as chip formation and deformation, cutting force, heat generated by cutting and cutting temperature, wear mechanism and life of cutting tools, vibration of cutting process and surface quality of machined parts, etc., which affect the quality of workpieces and processing costs from all aspects. Nowadays, with the development of the material industry, cutting tools adapted to various new materials are also constantly emerging. Therefore, under the premise of ensuring cutting performance, it is important to reduce the cost of metal cutting and improve the cutting environment. In the traditional metal cutting uses a large number of cutting oil and cutting fluid and other lubricating coolants, these lubrication coolants in metal cutting play a key role, on the one hand reduce the wear of cutting tools, on the other hand take away a large amount of cutting heat, to protect cutting tools and workpieces for the purpose. However, the hazards caused by the use of a large number of lubricating coolants are becoming increasingly prominent, and problems such as high production costs, poor environment, high waste liquid disposal costs, and occupational diseases caused by operators have made people re-examine the application of lubricating coolants.

        MQL application to metal cutting processing is a new lubrication cooling method, which can not only reduce the processing cost, improve the processing efficiency, but also can be applied to the processing of a variety of new materials, due to the application environment of MQL technology has been improved. The essence of MQL machining is that there is always a thin oil film between the cutting tool and the workpiece, so that the friction between the cutting tool and the workpiece is reduced, and the wear of the cutting tool is reduced. The main significance of MQL application to metal cutting lies in the following points:
1. Reduce the cost of machine tools, so that the acquisition cost is reduced;
2. There is 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 in energy consumption than the circulating system of cutting fluid;
4. The processing environment can be significantly improved;
5. The processing efficiency can become higher;
6. Occupational disease hazards can be eliminated.