CNC machining center is a high-efficiency automatic machine tool composed of mechanical equipment and CNC system, which is suitable for machining complex parts. CNC machining center is one of the most productive and widely used CNC machine tools in the world. Its comprehensive processing ability is strong. The workpiece can complete more processing contents after being clamped at one time, and the processing accuracy is high. For batch workpieces with medium processing difficulty, its efficiency is 5~10 times that of ordinary equipment, especially it can complete many processing that ordinary equipment cannot complete. It is more suitable for single piece processing with complex shape and high precision requirements or medium and small batch multi variety production. It integrates the functions of milling, boring, drilling, tapping and thread cutting on one equipment, so that it has a variety of processing methods.