Low temperature cutting is the use of low temperature fluids such as liquid nitrogen, liquid carbon dioxide and cold air to spray into the cutting area of the processing system, resulting in local low temperature or ultra-low temperature state in the cutting area, using the low temperature brittleness of the workpiece under low temperature conditions to improve the machinability of the workpiece , tool life and workpiece surface quality. There are two main application forms of liquid nitrogen cooling cutting. One is to use bottled pressure to directly spray liquid nitrogen into the cutting area like cutting fluid; the other is to use liquid nitrogen heated and evaporated to indirectly cool the tool or workpiece. At present, low-temperature machining is mainly used in the processing of difficult-to-machine materials such as titanium alloys, high manganese steels, and hardened steels.