【摘要】 本文介绍了等厚形三面型面的廊形曲线方程和加工特点，指出等厚形三面柱面是两个要素的配合，必须控制两个几何要素的尺寸和精度，并推荐了平均直径Ｄ和偏心量ｅ的尺寸系列，公差等级和检测方法。更多还原

【Abstract】 This paper illustrates the contour curvic equation and machining characteristics of isopochous trihedron, clarifies that isopochous trihedral cylinder is the surface with double el-ements, and elementntal dimension and precision have to be controlled.The dimensional series, grade of fit and checking method of average diameter D and eccentricity e are recom-mended.更多还原