CIRP Encyclopedia of Production Engineering

2019 Edition
| Editors: Sami Chatti, Luc Laperrière, Gunther Reinhart, Tullio Tolio


  • Andreas SterzingEmail author
Reference work entry



Stretching means tensile forming of a workpiece (sheet metal part, bulk metal part) by a tensile force which is externally applied and acting in the longitudinal axis of the workpiece.

Theory and Application

Generally, three different technological processes with various objectives can be differentiated in stretching (DIN 8585-2 2003).
  1. 1.

    Elongating (stretching) to increase the dimensions of the workpiece in the direction of force, e.g., in order to adapt to specified dimensions

  2. 2.

    Elongating (stretch leveling) in order to remove distortions from bars, profiles, and pipes and to remove dents from sheets

  3. 3.

    Elongating (straightening by stretch bending) in order to extend the rolling stock during (after) rolling, expressed by the degree of stretching


According to DIN 8585 and DIN 8582, elongating is part of the subgroup tensile forming within the main group 2 – forming (DIN 8585-1 2003)....

This is a preview of subscription content, log in to check access.


  1. Bräutigam H, Becker S (2009) Richten mit Walzenrichtmaschinen [Straightening using roller straighteners]. Vogel Business Media, Würzburg. (in German)Google Scholar
  2. DIN 8585-1 (2003) Fertigungsverfahren Zugumformen, Teil 1: Allgemeines; Einordnung, Unterteilung, Begriffe [Manufacturing processes forming under tensile conditions, part 1: general; Classification, subdivision, terms and definitions]. Deutsches Institut für Normung e.V, Berlin. (in German)Google Scholar
  3. DIN 8585-2 (2003) Fertigungsverfahren Zugumformen, Teil 2: Längen; Einordnung, Unterteilung, Begriffe [Manufacturing processes under tensile conditions, part 2: stretch reducing; classification, subdivision, terms and definitions]. Deutsches Institut für Normung e.V, Berlin. (in German)Google Scholar
  4. Fritz H, Schulze G (2006) Fertigungstechnik [Production engineering]. Springer, Berlin/Heidelberg. (in German)CrossRefGoogle Scholar
  5. Henrich Publikationen (2004) Mit “SCS” zur rostfreien Stahloberfläche? Streckrichten von Coils mit Beize- und Ölfreiem Fertigungsverfahren [Using SCS (Stretch Cold Roll Surface) for stainless surfaces? Pickle- and oil-free straightening of coils]. bbr Bänder Bleche Rohre 45 (2004) 1/2:32–34. (in German)Google Scholar
  6. Lange K (1990) Umformtechnik: Handbuch für Industrie und Wissenschaft, Band 3: Blechbearbeitung [Metal forming: handbook for research and industry, vol 3: sheet metal forming]. Springer, Berlin/Heidelberg. (in German)Google Scholar
  7. Spur G, Stöferle T (1985) Handbuch der Fertigungstechnik, Band 2/1–3: Umformen und Zerteilen [Production engineering handbook, vol 2/1–3: forming and separating]. Carl Hanser, München/Wien. (in German)Google Scholar

Copyright information

© CIRP 2019

Authors and Affiliations

  1. 1.Fraunhofer Institute for Machine Tools and Forming Technology (IWU)ChemnitzGermany

Section editors and affiliations

  • Bernd-Arno Behrens
    • 1
  1. 1.Institute of Forming Technology and Machines (IFUM)Leibniz Universität Hannover (LUH)GarbsenGermany