Patent ID: 7543471
Filing Date: 2009-06-09
Classification: B21D,F01N,F02M,F28D,F28F,Y02T,Y10S,Y10T

Abstract:
1. A method for producing an expansion bead in a tubular housing jacket, comprising a noncircular cross section, comprising the following method steps: provision of a housing jacket comprising a non-circular cross section comprising first and second longitudinal beads, wherein the housing jacket is cut to size; insertion of the housing jacket into an IHF mold and closing the mold; filling the mold and the housing jacket with a liquid pressure medium; deformation of the housing jacket by building up internal high pressure and producing a preliminary form of the bead (first deformation step); reduction of the internal high pressure; and production of the final form of the expansion bead by axial compression of the housing jacket in a second deformation step, wherein an inside radius of the expansion bead corresponds approximately to a wall thickness of the housing jacket and the expansion bead traverses a path in the housing jacket that comprises four substantially straight portions, at least two of the substantially straight portions being at substantially right angles to one another; and wherein the expansion bead traverses a portion of an outer contour of the first longitudinal bead and a portion of an outer contour of the second longitudinal bead.