Can achieve the minimum surface roughness of the grinding method. After grinding the workpiece, the surface roughness Ra is not more than 0.01? M, light, such as mirror, can be clearly imaging, so called mirror grinding. Grinding roundness of the cylindrical surface is not greater than 0.5? M, straightness is not greater than 1? M / 300mm, grinding plane flatness of not more than 3? M / 1000mm. Mirror grinding is mainly used for processing precision rolls, precision thread ruler, etc. to be particularly smooth and precise parts of the cylindrical or flat. Mirror grinding grinder to have the following conditions: a high precision, stiffness and take vibration measures; wheel spindle rotation accuracy is higher than 1? M; wheel frame relative to the table amplitude is less than 1? M; lateral feed The body can be precise micro-movement; table in the low-speed movement without crawling phenomenon. Mirror grinding, the first use of the size of 60 or less ceramic binder grinding wheel, the fine dressing, so that the effective surface of the grinding wheel to form a lot of high semi-passive micro-edge, grinding only fine grinding debris, And the appropriate friction and polishing effect, the surface roughness of Ra0.08 ~ 0.04? M, which is ultra-fine grinding stage. And then fine grinding abrasive (W14 ~ W5), resin binder and graphite filler made of grinding wheel, after fine finishing, in the appropriate grinding pressure grinding mirror after a certain period of time the role of friction and polishing, and finally to the surface roughness Ra is not more than 0.01 μm. Mirror grinding grinding less, such as grinding the outer circle, the wheel speed of 15 ~ 20m / s, the workpiece speed is less than 10m / min, table feed rate of 50 ~ 100mm / min, horizontal feed grinding Depth of 3 ~ 5? M, and then for the non-feeding light grinding 20 to 30 times. When grinding, the cutting fluid should be sufficient and have a good filter to prevent scratching the workpiece surface. Grinding wheel need to use sharp single-grain diamond, dressing, the table speed of 6 ~ 10mm / min, horizontal feed 2 to 4 times, each cut 2 ~ 3? M, and then no feed light repair once.