| 摘要 |
The present invention relates to a method for manufacturing a hollow body made of metal whose cross sectional shape changes in longitudinal direction, a tubular slug being sealed at its end and being placed into a mold that corresponds to the desired shape and that is placed in a tool, said slug being then put under high pressure from the inside by means of a pressure means, whereas the two ends of the tube are pressed against each other in axial direction during the process of deformation, the slug being submitted during deformation to a higher temperature in the area of these great deformations than in the area of smaller deformations in order to produce areas with great deformations in its cross sectional shape. |
