一、前言 在现有资料中,对于以圆弧为母线的回转体拉深件表面积的计算方法主要有两种:一种是给出特定母线构成的几何形状及有关参数,并列表相应给出面积计算公式;再一种是运用久里金法则——某母线的回转体表面积,等于该母线的长度与其重心的回转周长之乘积。列表给出一定圆心角(如30°、45°、60°、90°)之弧长及其重心座标值(相 I. INTRODUCTION In the existing data, there are mainly two methods for calculating the surface area of ​​revolving-body drawing parts with circular arc as the bus: one is to give the geometrical shape and related parameters of the specific bus-bar, and the corresponding list is given Area calculation formula; the other is the use of the rule of long rijin - a busbar rotating body surface area, equal to the length of the busbar and the center of gravity of the revolution circumference product. The list gives the arc length at a certain central angle (eg 30 °, 45 °, 60 °, 90 °) and its centroid coordinates