| 摘要 |
<p>The present invention relates to a method and a device for producing a cylindrical tubular element forming a barrel drum having at least one set of beads and tubular element thus produced. According to the invention, the set of beads (20a, 20b) is formed in a single operation by rolling, positioning a counter-roller against one of the faces of the wall of the tubular element (11) and bringing a roller to bear progressively on the opposite face of the said wall and facing the counter-roller, up to a working position which defines an acute angle with the axis of the said counter-roller, so that the beads have an amplitude which increases progressively from one of the ends of the cylindrical tubular element (11). <IMAGE></p> |
