1·In this paper, the design of curve of grooved drum is researched, which deduced two types of circular cone curves analytic formula of grooved drum.
探讨了槽筒沟槽曲线的设计，导出了络圆锥筒子的二种类型的曲线解析式。
2·The three dimensional design theory of the grooved drum trench curved surface includes: 1)the indirect and direct design of the bottom datum curve;
槽筒沟槽曲面三维设计理论包括：1）槽底基准曲线的间接设计与直接设计；