1. In order to ensure the machining accuracy, roughing and finishing are best performed separately
Because of the large amount of cutting during rough machining, the workpiece receives large cutting force, clamping force, heat generation, and the machined surface has a significant work hardening phenomenon, there is a large internal stress inside the workpiece, if the rough machining is continuous The precision of the parts after finishing will be quickly lost due to the redistribution of stress. For some parts that require high machining accuracy. After rough machining and before finishing, low temperature annealing or aging treatment procedures should also be arranged to eliminate internal stress.
2. Choose equipment reasonably
Rough machining is mainly to cut off most of the machining allowance and does not require high cnc machining accuracy. Therefore, rough machining should be carried out on a machine with greater power and less precision, and the finishing process requires higher precision. Machine tool processing. Rough and fine machining are processed on different machine tools, which can not only give full play to the equipment capabilities, but also extend the service life of precision machine tools.
3. In the machining process route, heat treatment procedures are often arranged
The location of the heat treatment process is arranged as follows: In order to improve the cutting performance of the metal, such as annealing, normalizing, quenching and tempering, etc., it is generally arranged before mechanical processing. In order to eliminate internal stress, such as aging treatment, quenching and tempering treatment, etc., it is generally arranged after rough machining and before finishing. In order to improve the mechanical properties of parts, such as carburizing, quenching, tempering, etc., it is generally arranged after machining. If there is a large deformation after heat treatment, the final processing procedure must be arranged.
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