1. Appropriate control of cutting force and cutting speed

　　Properly controlling the cutting force and cutting speed of the tool is also one of the effective means to reduce the temperature of the machining area and extend the service life of the cutting fluid. When processing difficult-to-machine materials, finely ground tool edges are generally used, and the cutting depth and cutting width should not be too large. When selecting cutting line speed, consider factors such as different material types, part structures, and machining equipment. In general, if the processing material is a nickel-based alloy, the linear speed should be controlled at 20 to 50 meters per minute; The processing material is titanium alloy, and the linear speed should be controlled at 30 to 110 meters per minute; The processing material is PH stainless steel, and the linear speed should be controlled in the range of 50 to 120 meters per minute.

　　2. Choose a reasonable cutting method

　　For difficult-to-machine materials, the choice of different cutting methods can make a big difference in the damage of cutting fluid. Regardless of the cutting method chosen, the principle is the same, that is, to reduce the cutting force and the temperature of the cutting area as much as possible. The cycloidal cutting method can minimize the cutting area, so that the actual cutting angle of the cutting fluid can reach a small angle, thereby extending the heat dissipation time of each tooth of the tool and reducing the cutting temperature. The use of spiral interpolation method can make the cutting amount of each tooth relatively uniform, avoid the cutting force concentrated on a few teeth and accelerate the wear, which is more obvious at the corners. The large feed cutting method is used to effectively reduce the cutting force with a small cutting depth and a large feed, so that the cutting heat is generated in the machining and the temperature of the processing area is low.

　　3. Ensure timely and effective chip breaking

　　In metal processing, there will generally be a large amount of cutting heat generated on the cutting chip, if the length of the chip can be controlled to ensure timely and effective chip breaking, this part of the cutting heat can be taken away by the chip, so chip breaking is an effective way to control the cutting temperature. When processing difficult-to-process materials, in the rough machining process, under the premise that the rigidity of the processing system allows, it should be made as much as possible to produce chips during the whole processing process. At the same time, use cutting fluid with good settling performance to settle and discharge the cutting chips, and do not let the cutting chips rub against the surface of the machined workpiece. When mixed with water, it forms a stable clear solution. This product has good settling, lubricity, rust resistance, cooling and cleaning properties. It has strong anti-microbial decomposition ability, can still maintain its stability under different water hardness conditions, and its service life is more than 5 times that of ordinary emulsified oil.