Winding the silk solution on a rotating mandrel provides control of tube properties like winding pattern, tube porosity and composite features.

将丝蛋白溶液涂在旋转卷筒上，可以对图案、管开孔率以及复合特性进行控制。

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This rotating pressure creates a hole in the middle of the billet, which is then formed into a pipe by a mandrel.

这种旋转压力在实心坯中间出现了一个孔，再通过心轴成型成管。

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And therefrom three formulas for calculating the coordinates of the eye movement track and the rotating angle of mandrel are given.

从而得出了丝嘴运动轨迹坐标和芯模转角的计算公式。

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