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What is precision machining? It is a process of changing the size or performance of a workpiece with a processing machine. It can be divided into cold working and hot working.
It is usually processed at room temperature and does not cause chemical or material changes in the workpiece, which is called cold processing. Generally, processing at or below normal temperature will cause chemical or physical changes of the workpiece, which is called thermal processing. The difference between cold working and machining methods can be divided into cutting and press processing. Hot working is often heat treated, forged, cast and welded.
The effect of precision machining is as follows:
1, the accuracy of parts geometry and position accuracy reaches micron or corner second level.
2, the tolerance of parts or characteristic size is below micron.
3. The surface roughness (the average height difference of surface roughness) is less than 0.1 microns.
4, mutual accessories can meet the requirements of combining ability.
5. Some parts can also meet the requirements of accurate mechanical or other physical characteristics, such as torsional stiffness of torsion bar of float gyroscope, stiffness coefficient of flexible components, etc.
Precision machining is realized by using precise machine tools, precise measuring instruments and instruments under strictly controlled environment. Machining accuracy up to and above 0.1 microns is called ultra precision machining. In aerospace industry, precision machining is mainly used to process precision mechanical parts in aircraft control equipment, such as precision fittings in hydraulic and pneumatic servo mechanisms, gyroscope frame, shell, air float, liquid bearing components and floats. Precision parts of aircraft have complex structure, small stiffness, high precision requirement and a large proportion of difficult-to-machine materials.
