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Describe the specific processing principles of precision mechanical parts

(1) To ensure the machining accuracy of precision mechanical parts, it is best to carry out rough and finish machining of mechanical parts separately. During the rough machining of mechanical parts, the cutting volume is large, the cutting force and clamping force on the workpiece are significant, the heat generation is considerable, and there is a relatively obvious work hardening phenomenon on the machined surface of the mechanical parts. There is also a large internal stress inside the workpiece. If the rough and rough machining of mechanical parts is carried out continuously, the accuracy of the parts after finishing will be lost quickly due to the redistribution of stress. For some mechanical parts with high processing accuracy requirements. After rough machining and before fine machining, low-temperature annealing or aging treatment processes should also be arranged to eliminate internal stress.

(2) Select equipment reasonably. Rough machining of mechanical parts mainly involves removing most of the machining allowance and does not require high machining accuracy of mechanical parts. Therefore, rough machining should be carried out on machine tools with greater power but not very high precision, while the finishing process requires the use of machine tools with higher precision. Rough and finish machining are carried out on different machine tools respectively, which not only gives full play to the equipment capacity but also extends the service life of precision machine tools.

(3) In the processing technology route of precision mechanical parts, heat treatment processes are often arranged. The arrangement of heat treatment process positions is as follows: To improve the machinability of metals, such as annealing, normalizing, quenching and tempering, etc., they are generally carried out before the processing of mechanical parts. To eliminate internal stress, such as aging treatment and quenching and tempering treatment, they are generally carried out after rough machining and before fine machining. To enhance the mechanical properties of parts, such as carburizing, quenching and tempering, they are generally carried out after the processing of mechanical parts. If there is significant deformation after heat treatment, the final processing procedures must also be arranged.