In this paper, the phenomenon that flat pipes are easy to be crumpled when they are extruded into bent ones is explored, and some methods are presented to solve this problem.
本文对扁管压成弯管时容易起褶皱或折断的现象进行了理论上的探讨，并提出了解决这一问题的措施。
The results show different performance deterioration between different bent pipes, the larger distance between bent pipe outlet and impeller inlet creates more decrease.
结果表明，弯管畸变对离心压气机性能的恶化程度与弯管所在位置有关，距离叶轮进口较远的弯管影响较大。
Tubes and pipes of the foregoing cross-sections may be polished, coated, bent, threaded, drilled, waisted, expanded, cone-shaped or fitted with flanges, collars or rings.
上述截面的管子可经抛光、涂层、弯曲、攻丝、钻孔、缩腰、胀口、成锥形或装法兰、颈圈或套环。
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