| 摘要 |
<p>The process comprises mounting a vessel 1 on a rotationally symmetrical mandrel 2 whose front end 5 is in contact with the bottom of the vessel 4, causing the bottom of the vessel to bear against the mandrel by means of a counteracting member 7, with the side wall of the counteracting member 7 being so dimensioned as to support and profile the inside wall of the flange. A part of the metal forming the side wall of the vessel in the annular region adjacent to the bottom is displaced by being rolled in the direction of the counteracting member 7 so as to form the annular flange 18, by means of rollers 8, 9. The operation may be carried out in one or more successive rolling passes. The vessel produced has excellent mechanical characteristics in its connecting region, and can be used for producing propulsion unit casings. <IMAGE></p> |
