论文部分内容阅读
一些曲体零件形状较为复杂,长度尺寸及角度尺寸有时不在同一测量平面内,尺寸的起止点是空间轴线投影交点。这样要直接测量所要求的尺寸比较困难,往往通过间接测量方法达到图纸要求。由于间接测量的误差环节多,因此在确定测量方法后应计算测量精度,它是否能满足图纸上被测尺寸的公差要求。曲体零件在三座标测量机上能较方便地测量,本文以图1所示零件介绍在万能工具显微镜上或在平台上的测量方法与精度分析。图中要求测量尺寸N是从φ16H7孔端面沿其轴线到与φ10H7孔轴线的投影交点之间距离,N=99.940_(0.050)~0;角度α是通过两孔轴线的两相互垂直的交线mm与φ10H7的轴线夹角α=40°20′±10′。
Some of the curved parts of the shape is more complex, length and angle dimensions sometimes not in the same measurement plane, the size of the starting and ending point is the spatial axis projection intersection. It is difficult to measure the required dimensions directly, often through indirect measurement to the drawing requirements. Due to the large number of error steps in indirect measurement, the measurement accuracy should be calculated after the determination of the measurement method, and whether it can meet the tolerance requirements of the measured size on the drawing. The curved part can be more conveniently measured on a three-coordinate measuring machine. In this paper, the parts shown in FIG. 1 are introduced to the measurement method and the precision analysis on the universal tool microscope or on the platform. The figure requires the measurement size N is the distance from the end face of φ16H7 hole along its axis to the intersection with the projection of the φ10H7 hole axis, N = 99.940_ (0.050) ~ 0; angle α is the intersection of two mutually perpendicular lines Angle between mm and φ10H7 axis α = 40 ° 20 ’± 10’.