The special meshing of convex and concave teeth profile makes the relative radius of curvature of the contacting point longer.
独特的凸凹啮合齿廓，使两齿轮在接触点处的综合曲率半径较大。
A molding for a cornice, having a partly concave and partly convex curve in profile, used especially in classical architecture.
反曲线饰纵断面部分为凹线，部分为凸形的檐口的线脚，尤用在古典建筑中。
A new tool path generation algorithm was presented to eliminate interferences, when nesting convex mold and concave die were machined with tool paths calculated by offsetting the 2D profile directly.
该算法只需要三次等距即可计算出凸台和凹槽加工刀轨，并且能够处理包含自由曲线的轮廓。
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