The parts with non circularity curve have very complex shape. The traditional machining method has bad flexibility, and it can't respond the variety of the electromechanical components updated.

具有非圆曲线外形的零件形状复杂，传统的靠模加工法柔性差，不能满足机电元件类型多样化、产品更新换代快的要求。

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The results show that, with an increasing internal pressure, non-circularity of the tube decreases, and the tendency of thickness thinning on inner and out side of the tube increases.

结果表明，随着充液压力的增大，截面不圆度逐渐减小，管材内侧壁厚增厚趋势减小，外侧减薄趋势增大。

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The results show that, with an increasing internal pressure, non-circularity of the tube decreases, and the tendency of thickness thinning on inner and out side of the tube increases.

结果表明，随着充液压力的增大，截面不圆度逐渐减小，管材内侧壁厚增厚趋势减小，外侧减薄趋势增大。

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