The method of CNC machining is a kind of "subtractive manufacturing", which is a technology that uses computer numerical control technology to engrave and shape block materials through the cutting tools of CNC machine tools. There is a wide range of materials for forming parts, including various engineering plastics, aluminum alloys, stainless steel, copper, titanium alloys, etc. It is widely used in R&D prototyping and mass production of accessories in automobile, communication, medical, watch, mobile phone, computer and other industries.