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根据国标GB231—84中的5.7和5.8条,可算出不同直径的压头所对应试样最小直径(见附表)。由附表可知,压头直径越大,对应的试样尺寸越大。在实践中,为了磨制方便,在满足国标GB231—84要求的前提下,取样时尽量将试样截小。因此,实际上许多布氏硬度试样直径小于30mm。 通常压痕测量显微镜的长镜筒内径为30mm,长镜筒外圆与镜筒底座内圆之间用螺纹连接。因此在测量小于30mm的试样时,显微镜不能平放在试
According to the national standard GB231-84 in 5.7 and 5.8, can calculate the diameter of the sample diameter corresponding to the smallest diameter of the sample (see table). As can be seen from the schedule, the greater the diameter of the indenter, the larger the corresponding sample size. In practice, in order to facilitate grinding, to meet the national standard GB231-84 requirements under the premise of sampling as much as possible when the sample cut small. Therefore, in fact, many Brinell hardness specimens have a diameter of less than 30 mm. Usually indentation measurement microscope long tube diameter of 30mm, the long tube and cylindrical barrel base within the circle between the threaded connection. Therefore, the measurement of less than 30mm sample, the microscope can not be flat on the test