Wieland-werke Ag

Eberhard Lepin

Andreas Beutler

Hans-Achim Kuhn

Isabell Buresch

Gerhard Schuez

Andreas Boegel

Karl-Hermann Stahl

Tony Robert Noll

Robert Kloeckler

Martin Straub

Hans-Juergen Stoeckl

Heinz-Ulrich Koboecken

Adolf Grohbauer

Thomas Jabs

Horst Glatz

Robert Klöckler

Johann Gschaider

Wolfgang Zeiler

The invention relates to a method for the manufacture of tubes bent in a U-shape (hairpin tubes) from a nonferrous metal, immediately following a tube production line. For that purpose, according to the invention, the method for the manufacture of tubes bent in a U-shape from a nonferrous metal, immediately following a tube production line, has the consecutive steps of:

Method for the economical production of heat exchanger tubes bent in a u-shape

A band-shaped semi-finished product is made out of a ductile material and is configured to be separated into at least two sections. At least one pair of wedge-shaped, non-cuttingly formed longitudinal notches are formed, between the tips of which there remains a thin web of material, which can be torn easily with little force. The semi-finished product is distinguished by burr-free separated edges, defined geometry of the separating surfaces, and extremely reduced breaking-surface portions. It shows improved resistance during static and dynamic stress, in particular for alternating bending loads, in comparison to conventional, for example via the rolling-cutting technique, separated semi-finished products.

Semi-finished product made out of a ductile material with breaking areas

Growing community of inventors

Illertissen, Germany

Eberhard Lepin