泡沫材料可用厚截面达到所需的刚度，可实现大的壁厚变化。
Foams can be used where thick sections are required to achieve rigidity, and can accommodate large wall thickness variations.
利用连续速度场分析了圆管空拔过程，建立了空拔壁厚变化量计算式。
Pipe sinking drawing is analysed using continuous speed field and the equations of wall thickness variations in sinking drawing established.
经验证，该式计算的空拔壁厚变化量与实际值基本一致，可用于工程计算。
By test, the variations calculated with the equations are in conformity with the actual values and can be used in engineering calculation.
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