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一、定向误差及其误差评定准则被测实际要素相对于具有确定方向的理想要素的变动量,称做定向误差。按给定的方向不同,定向误差可分为:平行度误差(平行方向)、垂直度误差(垂直方向)和倾斜度误差(任一给定角度方向)等三项。定向误差的评定准则:按理想要素的方向,用与公差带形状相同的包容区域包容被测实际要素,使其具有最小宽度或直径的区域(称做定向最小区域),该区域的宽度或直径即为定向误差值。如图1a所示,评定零件的上表
First, the orientation error and error assessment criteria Measured with respect to the actual elements of the determination of the ideal direction of change, called the orientation error. According to the given direction, the directional errors can be divided into three items: parallelism error (vertical direction), verticality error (vertical direction) and inclination error (any given angular direction). Criteria for the evaluation of the orientation error: In the direction of the ideal element, the actual element to be measured, which has the same shape as the tolerance band, is defined as having the smallest width or diameter (referred to as the smallest oriented area) whose width or diameter It is the orientation error value. As shown in Figure 1a, assess the parts of the table