Benteler Steel/tube Gmbh

Michael Markert

Dirk Tegethoff

Marcel Wellpott

Daniel Lücke

This invention concerns a tubular element for a gas pressure vessel of an airbag module, in particular of a vehicle, wherein the tubular element () consists of high-strength steel, has a first and a second end () and from the first end () to the second end () the tubular element () has an undeformed section (), a transition section () and a tapering section () and on the tapering section () at least one radially outwardly extending collar () is formed, characterized in that the collar () is separated from the transition section () by a first length section () having an outer diameter (A) smaller than the outer diameter (A) of the collar () and the wall thickness of the collar () is greater than the wall thickness of the first length section (). Furthermore, the invention concerns a gas pressure vessel and a process for manufacturing a tubular element according to the invention ().

Tubular element for gas pressure vessel, gas pressure vessel and method of manufacturing a tubular element

An inner diameter of a first end of a tubular component, positioned in relation to a first die, is reduced through relative movement between the tubular component and the first die such as to produce a first conical area between first and second ends of the tubular component. The first conical area is then formed through relative movement of a second die to create in a longitudinal section of the first conical area an outer circumferential embossment and an inner bead having an inner diameter smaller than the inner diameter of the first end. The first end is widened through insertion of an inner tool, while the tubular component is supported on an outside in a mold cavity of an outer tool. An inner contour with an internal stop is formed as an outer surface of the first end of the tubular component rests flatly in the mold cavity.

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Lichtenau, Germany

Michael Markert