(1) Precision Cnc Machining In order to ensure machining accuracy, rough and fine machining are best performed separately. Because of the large amount of cutting during rough machining, the workpiece is subjected to large cutting force, clamping force, heat generation, and the machined surface has a significant work hardening phenomenon, and there is a large internal stress inside the workpiece. If rough and rough machining Continuously, 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) Precision CNC machining is often arranged with a heat treatment process in the machining process. 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.
(3) Reasonable selection of equipment for precision CNC machining. Rough machining is mainly to cut off most of the machining allowance and does not require high machining accuracy. Therefore, rough machining should be carried out on a machine with greater power and less precision. 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.