Precision machining refers to a certain period of development, processing accuracy and surface quality to achieve a higher degree of processing technology. At present, precision machining refers to the processing technology with a processing accuracy of 1~0.1 μm and a surface roughness of Ra0.1 ~ 0.01μm.
Ultra-precision machining refers to a certain period of development, processing accuracy and surface quality to achieve the highest degree of processing technology. Obviously, in different periods of development, precision and ultra-precision machining have different standards. The current ultra-precision machining refers to the processing technology with the dimensional accuracy of the processed parts greater than 0.1 μm, the surface roughness Ra less than 0.025μm, and the resolution and repeatability of the positioning accuracy of the machine tool greater than 0.01μm, also known as sub-micron processing technology, and is developing to nano-scale processing technology.
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