| 摘要 |
<p>A device for wall-ironing sleeves having a wall portion of a wall thickness enlarged with respect to the wall thickness of the sleeve body near the open end. The device comprises at least two wall-ironing rings and a wall-ironing mandrel adapted to move through the rings and having a cylindrical front part and cylindrical rear part of reduced diameter, characterized in that the front part of the wall-ironing mandrel has an annular recess of a predetermined depth near the rear part.</p> |
