Patent Number: 6,167,983

Title: Process for production of tube profile element with swaged closed head end and muffler suspension produced thereby

Abstract: A process for production of a tube profile element having a swaged closed head end includes the steps of chamfering an unswaged end of a tube profile element having a first diameter to provide a chamfered end on the tube profile element having a chamfer angle of less than 45.degree. relative to a longitudinal axis of the end portion of the tube profile element, supporting the tube profile element in a retaining tool such that an end portion of the tube profile element having the unswaged chamfered end thereon extends beyond the retaining tool, providing a swage tool having a negative die capable of swaging the end portion of the tube into a swaged closed head end having a maximum second diameter larger the first diameter of the unswaged end of the tube, and moving the swage tool toward the end portion of the tube and swaging the unswaged chamfered end of the tube, by the negative die of the swage tool, into the swaged closed head end of the tube profile element. A muffler suspension made by the process includes a tube profile element of a first diameter and with a hollow interior, the tube profile element having a main body portion and opposite end portions. The main body portion has at least one bend formed therein. One of the opposite end portions has a swaged closed head end with a maximum second diameter larger the first diameter of the tube profile element and a fluid-tight configuration. The other of the opposite end portions has a fluid-tight configuration.

Inventors: Wunderlich; Horst (Neuenrade, DE), Fingerhut; Frank (Werl, DE)

Assignee: W. Lottgers GmbH & Co. KG

International Classification: B21D 41/00 (20060101); B21D 41/04 (20060101); F01N 7/18 (20060101); B60K 13/00 (20060101); B60K 13/04 (20060101); F01N 007/08 (); E21F 017/02 (); B21D 022/00 ()

Expiration Date: 01/02/2018