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我厂加工的300mm游标卡尺主尺,材料为65Mn,平面度0.08mm,光洁度8,厚度4_(-0.025)mm。原加工工艺如下:工件淬硬后,厚度先半精磨到4.2mm;再放在M7130平面磨床上,一次吸住10件,用46ZR1氧化铝砂轮精磨。以上工艺易使工件产生平面翘曲,即使两面交替磨削,每次磨去0.01～0.02mm,仍不能达到平面度要求,约有50％左右的工件平面度误差超差。为此,我们经多次试验,用以下三种方法对工件进行磨削加工,其效果较好: (1)将工件的凸面向上先磨削,两面交替,至尚留0.05mm余量时再平面校直,然后用磁力吸盘的剩磁将工件轻轻吸住,最后精磨两平面到尺寸要求。这
I plant processing 300mm vernier caliper main ruler, the material is 65Mn, flatness 0.08mm, finish 8, the thickness of 4 _ (- 0.025) mm. The original processing technology is as follows: After the workpiece is hardened, the thickness of the first semi-fine grinding to 4.2mm; then M7130 surface grinder, suck 10, 46ZR1 alumina grinding wheel. The above process is easy to make the workpiece plane warping, even if both sides of the grinding, each grinding to 0.01 ~ 0.02mm, still can not meet the requirements of flatness, about 50% of the workpiece flatness error tolerance. To this end, we have tried many times, with the following three methods of grinding the workpiece, the effect is better: (1) the convex surface of the workpiece first grinding, alternating on both sides, to leave 0.05mm margin and then Planar straightening, and then use the magnetic sucker magnetism gently suck the workpiece, and finally fine grinding two planes to the size requirements. This