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在蒸汽鍋爐、石油和化学器械的生產中,以及飛机製造工業、运輸机械製造和其他工業部門中都廣泛地用到弯管。弯製的管子有無縫鋼管、有縫管、和有色金屬的管子。在工業中应用的弯管,多半是在冷狀态中以通用的或專门的机器和夾具來完成。厚管可以在通用的設备上(机械的或液压的压力机和弯捲机器)採用与型軋同样的方法來弯曲。在这种机器上也可以進行弯曲半徑較大(大於管徑10倍以上)的薄管的弯製。对弯曲半径较小的薄管的弯曲,就有些特殊,而需要在專用的設备上用其他的方法來進行。弯曲時管內產生的应力和变形是極为複雜的。
Elbows are widely used in the production of steam boilers, oil and chemical equipment, as well as aircraft manufacturing, transport machinery and other industrial sectors. Curved pipe with seamless steel pipe, pipe joints, and non-ferrous metal pipe. Elbows used in industry, mostly in cold condition, are made with general purpose or specialized machines and fixtures. Thick pipes can be bent on common equipment (mechanical or hydraulic presses and bending machines) in the same way as for profile rolling. In this machine can also be bent large radius (greater than 10 times the diameter of the tube) bending. The bending of the thin tube with the smaller bending radius is somewhat special and needs to be carried out by other methods on a dedicated apparatus. Bending tube stress and deformation are extremely complex.