Use of the internal high-pressure forming method for producing a curved metallic along hollow body and a high pressure forming press on the inside, which can be used for this purpose.

摘要

To produce a elongate hollow metal body with a cross-sectional contour varying in the longitudinal direction by the internal high-pressure forming process, a sheet-metal blank 1 composed of two blank parts 2, 3 of identical area is first produced, each part having, apart from additional joining-area parts provided in the region of the longitudinal edges, a length at least dual to the length of the longitudinal hollow body and in the transverse direction at most half the length of the respective cross-sectional contour. Subsequently the two blank parts 2, 3 are laid one on top of the other and are joined together, in particular welded, in the region of the joining-area parts. Thereafter, the sheet-metal blank is expanded by introducing a pressure medium between the two blank parts held within a tool 10 consisting of two dies 11, 12. The tool is so shaped that, when it is closed onto the blank, it produces a curved shape in the blank, with the result that the hollow body produced by expansion is curved and can have a cross-sectional contour which varies along its length. IMAGE