The least amount of lubrication cutting technology: MQL (4)

5. Indian scientists Varadarajan, Philip and Ramamoorthy used the MQL system with mineral oil (with additives) as an oil in the experiment of turning 46HRC hard steel with a grooved composite coating tool. The study found that when the oil flow rate is 60ml / h, the processing effect is the most ideal. Compare the dry cooling, wet lubrication and MQL lubrication cooling effects under different cutting parameters. The overall performance of MQL in reducing cutting force, extending tool life, improving surface quality and metal removal rate was found to be better than other methods.

6. Japanese scientist Yokota Yokota found that the friction coefficient of cutting is lower when using MQL technology and synthetic grease using special cutting oil as the oil agent compared with the use of water-soluble cutting fluid and dry cutting.

7. American scientists Shamim and Ketteborough studied the tribological properties of oil mist-lubricated rolling bearings. Experiments have shown that the use of oil mist lubrication can reduce bearing friction by 25% and temperature by 10 °C compared to conventional oil pool lubrication.

At present, the research on MQL is still in its infancy, especially the application research on MQL system which is difficult to add to materials. The popularity of MQL systems must solve the problem of how to determine the amount of lubricating fluid required for processing, solve the problem of chip removal and chip removal, and solve the problem of cutting dust and oil mist on the automatic tool change system.

3 Conclusion <br> <br> prevent pollution and environmental pollution, to ensure the safety and health of workers is an issue of great concern around the world currently. Some countries have established strict laws and regulations on the use of cutting fluids, such as the National Institutes of Health (N IOSH), which requires reducing the amount of liquid mist in metal processing to 0.05 mg/m3. Therefore, the implementation of green manufacturing is an inevitable trend in the future manufacturing industry.

Cost-effective green manufacturing process—MQL has been used in machining applications such as turning, milling and drilling. The lubricants used in MQL systems are generally degradable and non-toxic, and do not pose a hazard to workers' health. The amount of cutting fluid is minimized, and the maintenance of the cutting fluid system and the cleaning of the workshop, air and workpiece are reduced, which greatly reduces the production cost. From the research, it is found that by using MQL technology, TiN coated tools can be used instead of CBN tools to reduce tool cost; when cutting stainless steel, the cutting friction coefficient can be significantly reduced, and tool wear can be reduced; when machining aluminum alloy, tool life can be extended by 3~5. Double, at the same time, can reduce the burrs and make the workpiece have better surface quality.

Therefore, considering the processing cost, production efficiency, environmental protection and labor health issues, MQL is a comprehensive and optimized cutting method.

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