According to the technical requirements of the part processing and the requirements of the process drawings, the correct processing program of the part is written, and then the processing program is input to the numerical control device, and the spindle movement, feed movement, tool change, and clamping and loosening of the workpiece are controlled by the numerical control device. The opening and closing of the cooling, cooling and lubricating pumps enable the cutting tools, workpieces and other auxiliary devices to work strictly in accordance with the sequence, trajectory and parameters specified by the processing procedures, and to process parts that meet the requirements of the drawings.