在生产制造与维修中,经常遇到球阀、球柄、半球体等各种缺顶的球形零件,如图1所示。这些球形零件的外径,有的在制造中被加工掉了,有的因磨损而不具备原形。因此,测量它们的曲率半径都比较困难,下面介绍几种简便准确的测算方法,供参考。一、图1中球形零件(a)的曲率半径的测算:方法1:如图2,将被测球形零件放在平板(或工作台)上,以三个垫块按互成120°支撑,用高度尺沿φM平面圆周按互成120°的三个方向将φM平 In manufacturing and maintenance, often encounter the ball valve, handle, hemisphere and other missing spherical parts, as shown in Figure 1. The outer diameter of these spherical parts, some in the manufacturing process has been lost, and some due to wear and tear without the prototype. Therefore, the measurement of their radius of curvature are more difficult, the following describes several simple and accurate method of calculation for reference. A. Calculation of the radius of curvature of the spherical part (a) in Fig. 1: Method 1: As shown in Fig. 2, the spherical part under test is placed on a flat plate (or a worktable) With a height scale along the circumference of φM plane by mutual 120 ° three directions φM flat