Under the conditions of high temperature and high pressure in the cutting zone, it is impossible to form a fluid lubrication state. In most cases, only a local lubrication state can be formed. At this time, the amount of
minimum lubricant required is very small, so
minimum lubricant The quality of lubrication performance depends on the formation speed of the lubricating film and the ability to protect the lubricating film. The lubricating film is usually required to form quickly, have a high surface adhesion coefficient, be able to inhibit the adhesion between the tool and the chip and the contact surface between the tool and the workpiece, and be able to withstand pressure and heat, while its own shear strength should be far low. Due to the shear strength of the workpiece or chip material, friction occurs between the lubricating layers, thereby reducing the friction generated by cutting and reducing the cutting temperature. Of course,
The environmental protection and safety of minimum quantity lubricants are important conditions for selection.
The amount of minimal lubricant used is one of the important factors affecting cutting performance. Different processing methods require different amounts of minimal lubricant. For example, milling is a surface machining operation that requires less lubricant, while deep hole drilling requires more lubricant. The size of the oil mist particles generated by the generating device and the spray direction, that is, the mist liquid distribution, also have a certain impact on the processing performance. The size of the mist particles formed is related to the lubricant composition, pressure, wind speed and nozzle hole diameter. Therefore, when designing the system, it is relevant The control of parameters (uniformity of mist particles, diameter of mist particles, injection direction, amount of lubricant, etc.) is a very important aspect.
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