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一、概速 随着科学技术的发展,世界各地出现了很多新兴的工业,这些新兴的工业中包括高精密的机器和仪表仪器的制造工业、高纯度材料和特种性能的材料工业、无线电电子工业、合成纎维工业等等,这些工业的工艺产品都有极高的精度要求。如超微型电子管,自动惯性导向系统的零件和半导体产品的精度要求极高。据国外资料,导向系统定向回转仪的超微型滚珠轴承,其装配公差要求达到O.025微米以下;又如高精密仪表所需的标准绕射光栅镜镜面所刻制的平行线的间
First, the rapid development With the development of science and technology, there have been many emerging industries around the world. These emerging industries include the manufacturing industry of high-precision machinery and instrumentation equipment, high-purity materials and special-performance material industries, and radio electronics. , Synthetics, etc., these industrial process products have extremely high precision requirements. Such as ultra-miniature electron tubes, automatic inertial guidance system parts and semiconductor products require high accuracy. According to foreign data, the ultra-miniature ball bearings of the directional gyro of the guide system have assembly tolerances below the O.025 micron limit, and the parallel lines between the standard diffraction grating mirrors required for high-precision meters.