The precision achieved by precision machining, processing size range, surface roughness, geometric shape, etc. are all important signs of my country's manufacturing technology level. Both precision and special processing technologies have become key technologies for success in international competition. Mechanical manufacturing technology has been rapidly developed at the same time in terms of improving accuracy and production efficiency. In terms of improving production efficiency, it has also increased the degree of automation, which is also the main direction of development in various regions. The speed of development from CNC to CIMS in recent years has also been practically used in a certain range. From precision machining to ultra-precision machining, this is also the main development direction of the world. The precision machining process refers to various machining processes whose machining accuracy and surface finish are higher than those of various corresponding machining methods. This method includes precision machining (diamond boring, precision turning, wide-edge precision planing and other processing methods), high-brightness, and high-precision grinding. The precision of precision machining is generally controlled between 10μm and 0.1μm, the tolerance level is above IT5, and the surface roughness Ra should be controlled below 0.1μm. Precision machining is a process of cutting a very thin layer of metal on the surface of the workpiece with a high, slow cutting speed, a small depth of cut, and a feed rate relying on high-precision, high-rigidity machine tools and finely sharpened tools. This process can significantly improve the machining accuracy of the parts. Because the area left in the cutting process is small, and the adverse effects of cutting force, cutting heat, vibration, etc. are largely eliminated, the surface deterioration layer left by the previous process can be effectively removed, pending precision processing. After that, the surface basically does not have residual tensile stress, and the roughness will be significantly reduced, which greatly improves the quality of the processed surface.