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在发动机零部件测量工作中,经常会遇到测量工件的定直径小倒角处的位置尺寸,如缸盖进、排气阀座密封带定直径位置等。因为倒角小,相对定位加工基准又成一定的角度,普通测量方法简直无法下手;三坐标测量也存在一定的困难,原因是测量区域太小,采点截面或采样点数量有限,很难将这种小倒角定直径处的位置测量准确。
In the measurement of engine parts, often encounter the diameter of the workpiece to determine the diameter of a small chamfer position size, such as the cylinder head into the exhaust valve seat seal with a fixed diameter position. Because the chamfer is small, the relative positioning processing standard is at a certain angle, and the ordinary measurement method can not be started; the CM measurement has some difficulties because the measurement area is too small, the number of sampling points or sampling points is too small, This small chamfer diameter measurements at the correct location.