The ultimate purpose of the minimum quantity lubrication system is to spray the generated mist particles into the processing area to achieve its lubrication and cooling effect. The reasonable selection of the injection direction is related to the heat transfer coefficient of the processing surface and the permeability of the lubricant. The key to whether the lubrication system can achieve good lubrication. Mei Guohui and others from Northeastern University studied the impact of the injection direction on the heat transfer of spray cooling, and concluded that different injection directions have different effects on the heat transfer coefficient under different water flow densities. et al. studied the influence of the spray direction on the machining performance when milling aluminum materials using a minimum quantity lubrication system. The results showed that when the nozzle spray direction is at an angle to the milling cutter feed direction, the mist particles are injected along the cutting edge direction. , it is easier to reach the internal contact surface between the tool and the chip, and the lubrication and cooling effects can be achieved more effectively. Liu Junyan studied the mechanism of water vapor as a green cooling lubricant and confirmed that during the flow of chips along the rake face, the sliding friction between the rake face and the bottom surface of the chip and the plowing action caused a large amount of formation on the chip contact surface. The capillary passes through the oil mist generator, allowing the cutting fluid to penetrate into the cutting area. Further research has proven that it is easier for the cutting fluid to penetrate along both sides of the tool surface, that is, along the direction of the cutting edge.
The figure simulates the flow field of the nozzle in different directions. It can be easily concluded that the contact area between the tool and the cutting fluid in the flow field formed by the nozzle jetting along the cutting edge direction is larger and the cooling effect is better. When discussing the working principle of the minimum quantity lubrication system, it was mentioned that the entry of oil mist particles into the gap between the front and rear blade surfaces and the gap between the tool tips is a key factor in cooling and lubrication, and the injection direction can be selected along the direction of the cutting edge, which can ensure lubrication The fluid has good permeability and can reach the front end of the tool smoothly, which is consistent with the results of the above study.
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