三十一面镜是我厂某产品检校仪器中角度分度基准光学零件,由于这种零件的面较多,角度的要求较高,所以给加工带来很多困难。六九年三月,在厂革命委员会和广大群众的大力支持下,我厂工具科钳工班的同志发扬敢想敢干的革命精神,采用金属材料不锈钢研磨出合乎图纸技术要求的三十一面镜。经使用单位鉴定,当时认为比较好。几年来,使用情况表明,由于金属表面易氧化,反射象的清晰度降低,影响仪器使用寿 Thirty-one mirror is a product of our factory calibration point angle optical instrument calibration instruments, due to the surface of this part more, the higher the angle, so to the processing a lot of difficulties. In March 1949, with the strong support of the Plant Revolutionary Committee and the general public, the comrades of the fitter’s class in our factory carried forward the revolutionary spirit of daring to dare to use the stainless steel of metal materials to grind out 31 pieces of technical requirements in line with the drawings mirror. Identified by the use of units, was considered better. Over the past few years, the use of the situation shows that due to the metal surface is easy to oxidize, reducing the clarity of the reflected image, affecting the service life of the instrument