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；
The mesh of copper tubes and loading ways of the balls are the key problems during three dimensional FE simulation of ball spinning of inner grooved tubes.
内螺纹管滚珠旋压三维有限元模拟中，铜管的网格划分和滚珠加载方式是模拟的关键问题。
The mesh of copper tubes and loading ways of the balls are the key problems during three dimensional FE simulation of ball spinning of inner grooved tubes.
内螺纹管滚珠旋压三维有限元模拟中，铜管的网格划分和滚珠加载方式是模拟的关键问题。
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