论文部分内容阅读
一、平面度误差的评定及最小区域法尺寸较大的平面,其平面度误差的评定比一般几何要素的评定要复杂得多,如严格按照平面度误差的定义进行评定,一般需采用最小区域法,使评定出的误差符合最小条件。根据最小包容区域的要求,由两个平行的包容平面来包容实际平面的最高点和最低点至少要有四个点接触,并符合下述两准则之一,这两个包容面之间才是最小包容区域,其距离即为符合最小条件的平面度误差值。 (1)三角形准则——在矩阵图上出现三个等高的最低(高)点形成一个三角形,最高(低)点投影在此三角形之内,极限情况时其投影在三角形的边上,这种表面大体上是凸(凹)面。
First, the assessment of flatness error and the largest area of the smallest size of the plane, the flatness error assessment than the general geometry of the assessment is much more complex, such as in strict accordance with the definition of flatness error assessment, the general need to use the smallest area Act, so that the assessment of the error in line with the minimum conditions. Depending on the minimum containment area, there must be at least four point contacts for the highest and lowest points of the actual plane to be contained by two parallel containment planes and one of the two criteria below is met between the two containment planes The minimum containment area, the distance is the minimum flatness error value. (1) Triangle Guidelines - The lowest (high) point of the three contours appears on the matrix to form a triangle with the highest (low) point projected inside the triangle and the extreme projection of it on the edge of the triangle, which The seed surface is generally convex (concave).