Device and process for joining fitting parts on hollow profiles by means of fluid high internal pressure

US6499212B2 · kind B2 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Henning Bloecker · Seevetal, DE
• Martin Kruessmann · Stuttgart, DE
• Jochen Paus · Hamburg, DE

Key dates

• Filing date: Nov 30, 2000
• Grant date: Dec 31, 2002
• Expiry date: Nov 30, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/53313
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A device and method for joining fitting parts provided with a passage opening on hollow profiles through partial expansion of the hollow profiles at the location of the fitting parts is provided. The fitting parts are slid on with the passage openings and are held in position by-means of fluid high internal pressure expansion of the hollow profile. The device includes an expanding lance, which can be slid into the hollow profile and exhibits an axial borehole for the purpose of guiding the pressure fluid. The axial borehole is connected to a fluid high pressure generating system and exhibits a cross channel with an outlet for the pressure fluid in the direction of the hollow profile location to be expanded. The shell surface of the expanding lance exhibits sealing elements that are spaced apart and that define the outlet so as to seal axially on both sides against high pressure. To a reliable joining of the fitting parts on hollow profiles even when the hollow profiles exhibit small outer diameters, it is proposed that the expanding lance comprises two separate, aligned oblong components, of which at least one bears the axial borehole which empties freely on an end face near the ou…