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Untersuchungen UEber Das V-Biegen Von Blechen (9783663065197)



Bei der Bearbeitung von Blechen kommt dem V-Biegen unter den Umform- verfahren eine besondere Bedeutung zu, worunter das Biegen von V -formigem Profil mittels eines zwischen den Gesenkauflagen mit seiner Spitze auftreffenden Stempels verstanden wird im Gegensatz zum U-Biegen, Z-Biegen und anderen Biegeprofilformen. Daher ist die Kenntnis des Biegevorganges und der dabei auf- tretenden Gefugeveranderungen im Werkstuck fur die zulassige Beanspruchung wichtig, zumal hierbei sowohl das Blech mitunter Formanderungen und somit Verfestigungen bis zur Kaltbruchigkeit erleidet, als auch GroBe und Richtung der auftretenden Kriifte den Bau der Biegemaschine bestimmen. In den folgenden Abschnitten werden einzelne Teilgebiete aus dem Arbeitsbereich des V-Biegens naher untersucht. 7 1. Ermittlung der Biegekraft, des Riickfederungsverhaltens und des geringstzuHissigen n/so-Verhaltnisses beim Kaltbiegen Von verschiedenen technischen Oberwachungsbehorden und Klassifikations- gesellschaften ist flir das Kaltbiegen eine hochstzulassige Blechdicke, unabhangig von der Krummung vorgeschrieben. Urn die Haltlosigkeit einer solchen Vorschrift nachzuweisen, ist es erforderlich, an verschiedenen Blechen unterschiedlicher Dicke und Biegekrummung, also unterschiedlichen ri/so-Verhiiltnissen die Grenze zu finden, bis zu welcher eine Anderung des Ursprungsgefuges uberhaupt nicht eintritt, d. h., daB im engsten Bereich der Krummung an der Innenfaser weder ein gestauchtes noch an der AuBenfaser ein gestrecktes Gefuge wahrzunehmen ist. 1.1 Versuchsgruppe 1 Zunachst wurde ein 15 mm dickes Festigkeits-Stahlblech St 37 untersucht, das in einem V-Biege-Gesenk einer Auflagenweite w = 90 mm mittels einer Frei- biegestempelschiene einer unteren Rundung von r = 10 mm gebogen wurde.


Product details

  • Paperback | 62 pages
  • 170 x 244 x 3mm | 118g
  • United Kingdom
  • German
  • 1966 ed.
  • Bibliography; Illustrations, black and white
  • 3663065197
  • 9783663065197


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