Do you know the definition of precision machining?

I haven't come up with a copy for half an hour, so I wish you all a fortune in August. Today I want to share with you the definition of precision machining.
Precision machining is a machining method with machining accuracy of 1 micron.
Precision machining is realized by using precision machine tools, precision measuring tools and meters under strictly controlled environmental conditions. Machining accuracy of 0.1 micron or more is called ultra precision machining. In the aerospace industry, precision machining is mainly used to process precision mechanical parts of aircraft control equipment, such as precision parts in hydraulic and pneumatic servo mechanism, frame and shell of gyroscope, air bearing, liquid bearing components and float, etc. Aircraft precision parts have complex structure, small stiffness, high precision requirements, and difficult to process materials account for a large proportion. The technological effects of precision machining are as follows: 1) the geometric shape and mutual position accuracy of the parts reach micron or angular second level; 2) the boundary or feature dimension tolerance of the parts is below micron; 3) the micro roughness (average height difference of surface roughness) of the parts is less than 0.1 micron; 4) the surface roughness of the parts is less than 0.1 micron; ④ Some parts can also meet the requirements of precise mechanical or other physical properties, such as the torsional stiffness of the torsion bar of the floater gyroscope and the stiffness coefficient of the flexible element.

Precision machining mainly includes finish turning, finish boring, finish milling, finish grinding and grinding. ① Finish turning and finish boring: most of the precision light alloy (aluminum or magnesium alloy) parts of aircraft are processed by this method. Generally, natural single crystal diamond tools are used, and the arc radius of the cutting edge is less than 0.1 μ M. The accuracy of 1 μ m and the surface roughness with average height difference less than 0.2 μ M can be obtained by machining on high precision lathe, and the coordinate accuracy can reach ± 2 μ M. ② Finish milling: it is used to process aluminum or beryllium alloy structural parts with complex shape. Depending on the accuracy of the guide rail and the spindle of the machine tool, a higher mutual position accuracy can be obtained. Precise mirror surface can be obtained by high speed milling with carefully ground diamond cutter head. ③ Fine grinding: used for machining shaft or hole parts. Most of these parts are made of hardened steel with high hardness. Most high precision grinding machine spindles use hydrostatic or hydrodynamic bearings to ensure high stability. The limit precision of grinding is not only affected by the rigidity of machine tool spindle and bed, but also related to the selection and balance of grinding wheel and the machining precision of workpiece center hole. The precision of 1 micron and out of roundness of 0.5 micron can be obtained by fine grinding. ④ Grinding: select and process the irregular convex parts on the machined surface by using the principle of mutual grinding of mating parts. Abrasive diameter, cutting force and cutting heat can be precisely controlled, so it is the most accurate machining method in precision machining technology. In order to achieve the precision of 0.1 or even 0.01 micron and the micro roughness of 0.005 micron, the hydraulic or pneumatic fitting parts of precision servo parts of aircraft and the bearing parts of dynamic gyro motor are processed by this method.
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