(1) To ensure machining accuracy, rough machining and precision machining are separated. Due to the large cutting amount during rough machining, the workpiece has a large cutting force, clamping force, and heat generation, resulting in significant surface hardening and high internal stress in the workpiece. Rough machining and rough machining can be carried out continuously, and the accuracy of the workpiece can be quickly lost due to the redistribution of stress. For some parts with high precision requirements. After rough machining and before finishing, low temperature annealing or timely processing should be used to eliminate internal stress.

(2) Reasonable selection of equipment. Rough machining mainly involves cutting most of the machining allowance, but it does not require high machining accuracy. Therefore, rough machining should be carried out on machine tools with high power and low accuracy, while the precision machining process requires higher accuracy. Separating coarse and fine machining on different machine tools can not only fully utilize the capacity of the equipment, but also extend the service life of precision machine tools.

(3) The heat treatment program is often arranged on the CNC precision machining process route. The arrangement of the heat treatment process is as follows: in order to improve the cutting performance of the metal, such as annealing, normalizing, quenching and tempering, etc., Usually arranged before CNC precision machining. In order to eliminate internal stress, such as timeliness, tempering, etc., Usually arranged before rough and finish machining. In order to improve the mechanical properties of parts, such as carburization, quenching, tempering, etc., Usually carried out after CNC precision machining. If there is significant deformation after heat treatment, the processing process should also be arranged.