What are the specific principles for processing precision mechanical parts?

Describe the specific processing principles for precision mechanical parts processing

(1) In order to ensure the machining accuracy of precision mechanical parts, it is best to separate the machining of coarse and fine mechanical parts. Due to the large amount of cutting required during the processing of rough mechanical parts, the workpiece is subjected to high cutting and clamping forces, generates a lot of heat, and exhibits significant work hardening on the machined surface, resulting in high internal stresses within the workpiece. If the processing of rough and rough mechanical parts is carried out continuously, the precision of the precision machined parts will be quickly lost due to the redistribution of stress. For some mechanical parts that require high machining accuracy. After rough machining and before precision machining, low-temperature annealing or aging treatment should also be arranged to eliminate internal stress.

(2) Reasonably select equipment. Rough machining of mechanical parts mainly involves cutting off most of the machining allowance and does not require high machining accuracy. Therefore, rough machining should be carried out on machine tools with high power and low precision, while precision machining requires the use of high-precision machine tools. Rough and precision machining are carried out on different machine tools, which can fully utilize the equipment's capabilities and extend the service life of precision machine tools.

(3) In the process route of precision mechanical parts processing, heat treatment procedures are often arranged. The arrangement of heat treatment process locations is as follows: In order to improve the cutting performance of metals, such as annealing, normalizing, quenching and tempering, it is generally arranged before the machining of mechanical parts. To eliminate internal stress, such as aging treatment, quenching and tempering treatment, it is generally arranged after rough machining and before precision machining. In order to improve the mechanical properties of parts, such as carburizing, quenching, tempering, etc., they are generally arranged after the machining of mechanical parts. If there is significant deformation after heat treatment, the final processing steps must also be arranged.