US 7,343,678 B2 · Method and device for production of a hollow section

Abstract

The invention concerns a method and apparatus for production of a hollow section (1) in which a coiled pre-shape of the hollow section (1) is deep drawn from a sheet part, which is pre-bent after a trimming process and coiled into the final shape of hollow section (1). The edges (45) of hollow section (1) lying in the peripheral direction are then joined together in the contact region. In order to improve the joining capability of hollow section (1) to other components in simple fashion, it is proposed that before the coiling process at least one flat site (35) for joining to another component be embossed before the coiling process in a pre-bent region of the hollow section (1).

Claims12

Dependent claims

A method for production of a hollow section, comprising

deep drawing sheet to form an unwound pre-shape of the hollow section, said pre-shape having a center piece and two half-connectors connected to each end of said center piece through a transition part, each of said two half-connectors having a cap,
trimming excess material including the caps of the half-connectors,
pre-bending said center piece of said pre-shape,
embossing at least one secondary shaped element (35) in a pre-bent region of the pre-shape, said secondary shaped element (35) adapted for joining to another component,
bending the pre-bent pre-shape into a final wound shape of the hollow section, forming contact regions where edges, lying beneath each other, of the hollow section contact,
joining the edges of the hollow section to each other in a peripheral direction in the contact region.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/010,767Filed 13 Dec 2004

Priority

DE 103 58 50213 Dec 2003

Published

US 2005/0160600 A128 Jul 2005

Granted

18 Mar 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

F01N 13/18
Exhaust or silencing apparatus characterised by constructional features: construction facilitating manufacture, assembly, or disassembly
B21C 37/296
Making branched pieces, e.g. T-pieces: making branched pieces starting from strip material; Making branched tubes by securing a secondary tube in…
F01N 13/08
Exhaust or silencing apparatus characterised by constructional features: other arrangements or adaptations of exhaust conduits
Y10T 29/49398
Method of mechanical manufacture: muffler, manifold or exhaust pipe making

Method and device for production of a hollow section

Life of this patent

Method and device for production of a hollow section

Life of this patent

Abstract

Claims12