Describe the specific processing principles of precision parts processing
(1) In order to ensure the machining accuracy of precision parts, the machining of rough and fine mechanical parts is best carried out separately. Because of the large amount of cutting when machining rough mechanical parts, the workpiece is subjected to large cutting force, clamping force, heat generation, and the surface of the mechanical parts has a significant work hardening phenomenon, and there is a large internal stress inside the workpiece. If the machining of rough and rough mechanical parts is carried out continuously, the precision of the parts after finishing will be quickly lost due to the redistribution of stress. For some mechanical 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 of mechanical parts is mainly to cut off most of the machining allowance, and high machining accuracy of mechanical parts is not required. Therefore, the rough machining should be carried out on a machine with higher power and less precision, and the finishing process requires the use of High-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 process route of precision parts processing, a heat treatment process is 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 the machining of the mechanical parts. 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 the parts, such as carburizing, quenching, tempering, etc., it is generally arranged after the machining of the mechanical parts. If there is a large deformation after heat treatment, the final processing procedure must be arranged.