The cutting fluid interface lubricant is usually ineffective when the temperature is extremely low. At this time, there should be a lubricant that will not affect the lubrication in the high temperature environment, which is often called extreme pressure lubricant and extreme pressure antiwear agent. A good extreme pressure and anti-wear lubricant can not damage the two surfaces at 900 ℃, producing a dense lubricating film, reducing friction and friction heat between them. Therefore, it is necessary to add a certain amount of extreme pressure and anti-wear agent to a good cutting fluid.
Many people think that cutting fluid with good extreme pressure property is high-quality cutting fluid? Is that right? In fact, this is a problem widely misunderstood by most lubricant practitioners. Some people always think that improving the quality or quality grade of cutting fluid is to continuously improve the extreme pressure and lubricity of cutting fluid, and attempt to divide the quality grade of cutting fluid by its lubricity.
The performance requirements of cutting fluid are various, and its required performance is determined according to the needs of practical application. Lubrication performance is only one of many functions of cutting fluid, not the higher the lubrication is, the better it is. Excessive lubrication often brings negative effects with opposite effects. For example, chemical wear caused by excessive extreme pressure can greatly shorten tool life, and the application of extreme pressure agent can promote rust and cause severe corrosion, The adsorption film (especially chemical film) formed by lubricating additives and workpiece surface brings troubles to the post-treatment and application of workpiece (such as some metal parts used in atomic energy industry and electronic industry). Therefore, let customers pay attention to these when choosing cutting fluid, otherwise it will be counterproductive and bring adverse consequences.
