摘要 |
<p>A method of manufacturing conical tube elements, in particular from aluminium cylindrical tubes consists in that a straight-line tube element is placed onto a mandrel of a forming device, which mandrel is two metres long at the most and then a section of said tube element placed onto said mandrel is subjected to rolling and after that, without interrupting the process, the remaining part of the tube element is subjected to rolling and drawing.</p> |