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At present, most users do not have a clear understanding of the oil properties used under the conditions of micro-lubrication. It is considered that as long as the oil can be used in the micro-lubrication process, this is a misunderstanding, and it is very important to correctly select the micro-lubricant.
First of all, mineral oil cannot be used in the micro-lubrication process, mainly because the oil mist particles produced by the mineral oil are harmful to the human body, and the particle size generated by the atomization of the mineral oil is large, the lubrication effect is not good, and the mineral oil is not suitable for high-speed processing. Lubrication in the state.
The micro-lubrication system is applied to the cutting process, and the oil is essential. First of all, the oil should be environmentally friendly and cannot cause harm to the health of the operator. At present, foreign countries have clearly defined the oil used in the field of metal cutting, and the use of MQL technology in the domestic machining field is still in its infancy. Since the micro-lubrication processing oil is atomized into oil-suspended particles of 0.5-10 micrometers, When choosing a small amount of lubricant, you should first consider the health and environmental characteristics of the oil.
Under the premise of ensuring that the oil is harmless to human health, it is necessary to consider the lubrication and atomization characteristics of the oil in the cutting process. First, the oil should be considered to have low viscosity, and only the low-viscosity lubricating oil can be heated. It is atomized into ultra-fine suspended particles in the micron range, and can be transported over long distances without being affected by the high speed of the machine. The use of mineral oil has many drawbacks. Firstly, it is difficult to atomize under the condition of no heating. Even if it is heated, the atomization effect of ultrafine particles cannot be achieved. After atomization of mineral oil, it is not easy to transport in a small channel for long distance, and it is easy to form oil. Drops, especially affecting the transport in the spindle, tend to cause oil accumulation in the pipeline, while the terminal lubrication effect is poor. The reason is that the oil mist that forms large particles is affected by the centrifugal force of the machine tool spindle. The machining under micro-lubrication conditions greatly reduces the consumption of lubricating oil relative to the cutting fluid, and the consumption per hour is less than 50 ml/h, which is significantly lower than that of the conventional heated oil mist lubrication system.
The use of a micro-lubrication system, the generation of oil mist is very critical. There are many factors that affect the effectiveness of MQL micro-lubrication.