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刀口尺用来测量、检验工件的平面度、直线度。它具有结构简单、操作方便、测量效率高等优点,是机械加工常用的测量工具。刀口尺的精度一般都比较高,直线度误差控制在1μm左右,测量面粗糙度R_a为0.025μm这样的精度,若使用不当,则会在使用中产生变形。这种变形通常不为人们注意,但往往超出了刀口尺的精度范围,从而影响测量精度。为了加深对变形问题的了解,我们做了一些实验。用精度完好的两种规格的刀口尺(225mm,300mm)作为实验对象,经过多次试验发现,当用手捏住刀口尺背部并将刀口尺测量面垂直置于检验平尺之上观察数分钟后,刀口尺
Knife mouth to measure, test the workpiece flatness, straightness. It has the advantages of simple structure, convenient operation and high measuring efficiency, and is a commonly used measuring tool in machining. Accuracy of knife-edge is generally higher, the straightness error control in about 1μm, the measuring surface roughness R_a of 0.025μm such accuracy, if used improperly, it will produce deformation in use. This deformation is usually not people pay attention, but often beyond the scope of the accuracy of knife-edge, thus affecting the measurement accuracy. In order to deepen the understanding of deformation problems, we did some experiments. Using two specifications (225mm, 300mm) with good accuracy as the test object, after many tests, it was found that when the back of the knife blade was gripped by hand and the knife edge measurement surface was placed vertically on the inspection scale for a few minutes After the knife blade