Metal cutting is an important link in industrial activities and has been used in the production process long ago. The process of metal cutting is to use cutting tools to remove excess material 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 parts are qualified. A lot of content is involved in the metal cutting process, such as chip formation and deformation, cutting force, heat and cutting temperature generated by cutting, wear mechanism and life of cutting tools, vibration during cutting and surface quality of processed parts, etc. These contents are from All aspects affect the quality of the workpiece and the processing cost. Nowadays, with the development of the material industry, cutting tools adapted to various new materials are also emerging. Therefore, under the premise of ensuring cutting performance, it is important to reduce the cost of metal cutting and improve the cutting environment. A large amount of lubricating coolants such as cutting oils and cutting fluids are used in traditional metal cutting. These lubricating coolants play a key role in metal cutting. On the one hand, they reduce the wear of cutting tools and take away a large amount of cutting. Heat protects the cutting tool and workpiece. However, the hazards caused by the large-scale use of lubricating coolants have become increasingly prominent. The high production costs, poor environment, high waste liquid disposal costs, and occupational diseases caused by operators have caused people to re-examine the application of lubricating coolants.
The application of MQL to metal cutting is a new way of lubrication and cooling. It can not only reduce the processing cost and increase the processing efficiency, but also apply to the processing of a variety of new materials. The application environment of MQL technology has been improved. The essence of MQL processing 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 machine tools, so that the purchase 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 than the circulating system of cutting fluid in terms of 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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