CNC machining refers to the process of using CNC (Computer Numerical Control) machine tools to perform machining operations on metal components. CNC machine tools are capable of automatically controlling the machining process based on pre-programmed instructions, allowing for high precision and efficiency. CNC machining processes typically include turning, milling, drilling, grinding, and other techniques, and can be applied to various shapes and materials of metal components. Compared to traditional manual or semi-automatic machining methods, CNC machining offers advantages such as high precision, high efficiency, and good repeatability, greatly improving the production efficiency and quality of metal components.