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在大批生产中,一般都用极限量规测量。操作者所加工的工件实际孔或轴均靠近量规“过端”一侧形成一个峰值。若无“中间公差”工序控制,往往出现“孔偏小,轴偏大”的现象。“孔偏小,轴偏大”的严重的弊端:它不仅有废品,尤其会出现大量的返修件,降低了工件的一次合格率,且使零件随机组装一般都偏紧,难于确保设计要求的配合性质。
In a large number of production, the limit gauge is generally used to measure. The actual hole or the axis of the workpiece being machined by the operator forms a peak close to the “over” side of the gauge. If there is no “intermediate tolerance” process control, often appear “hole is small, big axis” phenomenon. “Hole is small, the shaft is too large,” a serious drawback: it is not only scrap, in particular, there will be a large number of rework parts, reducing the pass rate of a workpiece, and the random assembly of parts are generally tight, it is difficult to ensure that the design requirements With the nature.