| 摘要 |
The invention concerns methods and devices for bending a cylindrical tube or the like ( 1 ) so as to obtain two consecutive sections ( 2, 3 ) of said tube forming between them a non-null angle alpha. The method is essentially characterised in that it consists in producing, in the wall ( 4 ) of the tube ( 1 ), a wave ( 20 ) defined between two flanks ( 22, 23 ) forming between them a non-null angle beta substantially centred on the separation plane ( 21 ) between the two sections, then in producing a permanent plastic deformation of the wave ( 20 ) until the value of the angle between the two sections ( 2, 3 ) is obtained. The device enables to implement said method. The invention is useful in particular but not exclusively, for producing pipes for transporting fluids in motor vehicles or the like.
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