Method for producing a hollow composite members

US5664327A · kind A · utility

Assignee

• EMITEC Gesellschaft fuer Emissionstechnologie mbH · DE

Inventor

• Helmut Swars · Bensberg, DE

Key dates

• Filing date: May 30, 1996
• Grant date: Sep 9, 1997
• Expiry date: May 30, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/4994
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A process for producing hollow composite members, comprising the steps of: providing an outer material layer; providing a tubular supporting member within the outer layer; initially plastically expanding the supporting member to produce a connection between the outer layer and the supporting member; and subsequently plastically expanding the supporting member in a central region while simultaneously axially shortening the supporting member, so that a tensile prestress is generated in the circumferential direction and a compressive prestress is generated in the longitudinal direction of the outer layer.