The stress boundary constitutes an important factor in drawing curved surface parts.
曲面零件拉深成形中，应力分界圆是非常重要的因素。
Drawing a straight line on a piece of stone and make the surface curved naturally on one side, the curved surface sprawl across the other three edges.
在一块石板上刻画一条直线，在线的一侧做成起伏不定的自然曲面，曲面向另外三边自由蔓延。
A curved surface shell hot drawing was simulateel by finite element method and forming trial was condncted.
采用有限元法模拟曲面壳体热拉深成形，并进行成形工艺试验，其模拟结果与试验结果一致。
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