1, in order to ensure the processing accuracy, rough and finish processing is best separated:
Because roughing, the amount of cutting, workpiece by cutting force, clamping force, heat, and processing surface has a more significant work hardening phenomenon, there is a larger internal stress in the workpiece, if roughing continuous, the precision of parts after finishing will soon be lost because of the redistribution of stress. For some parts with high processing accuracy requirements. After roughing and before finishing, low temperature annealing or aging process should also be arranged to eliminate internal stress.
2, In the machining process route, heat treatment process is often arranged:
The position of heat treatment process is arranged as follows: in order to improve the cutting performance of metal, such as annealing, normalizing, quenching and tempering, it is generally arranged before mechanical processing. In order to eliminate internal stress, such as aging treatment, quenching and tempering treatment, generally arranged after rough machining, finishing before. In order to improve the mechanical properties of parts, such as carburizing, quenching, tempering, etc., generally arranged after mechanical processing. If there is a large deformation after heat treatment, the final processing procedure must be arranged.
3, reasonable selection of equipment:
Roughing is mainly to cut off most of the processing allowance, and does not require a higher processing accuracy, so roughing should be carried out in a large power, precision is not too high on the machine tool, finishing process is required to use a higher precision machine tool processing. Coarse and finish machining are processed on different machine tools, which can not only give full play to the equipment capacity, but also prolong the service life of precision machine tools.
