CIRP Encyclopedia of Production Engineering

2014 Edition
| Editors: The International Academy for Production Engineering, Luc Laperrière, Gunther Reinhart

Bending (Sheets)

  • Joost DuflouEmail author
Reference work entry



Bending is a forming process in which a blank is locally formed along a bending line as result of applying a bending moment. Starting from a flat blank, complex 3D parts can thus be formed, composed of flat flanges and semi-cylindrical bend connections. Below 15 mm thickness the process is known as sheet metal bending, while for blanks above 15 mm plate bending is the more common terminology.

Theory and Application

Bending Methods

Different methods can be applied to impose a bending moment on a sheet metal blank (Lange 1985). The most common techniques consist of positioning the sheet to be formed with the bend line coinciding with the centre line of a V-die and pressing a punch tool in the orthogonal direction (Fig. 1 right). The force exerted during this operation is typically delivered by a press brake (Fig. 1left). Two main variants of this method can be distinguished. When the sheet is formed by imposing forces...
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  1. Aerens R (2000) Le pliage en l’air; WTCM, section construction Mécanique, MC110, HeverleeGoogle Scholar
  2. Benson SD (1997) Press brake technology, a guide to precision sheet metal bending, Society of Manufacturing EngineersGoogle Scholar
  3. DIN 6935 (1975) Kaltbiegen von Flacherzeugnissen aus Stahl, DK 621.981.01: 669.14-4Google Scholar
  4. Duflou JR, Aerens R (2006) Force reduction in bending of thick steel plates by localized preheating. CIRP Ann Manuf Technol 55(1):237CrossRefGoogle Scholar
  5. Duflou JR, Váncza J, Aerens R (2005) Computer aided process planning for sheet metal bending: a state of the art. Comput Ind 56(7):747CrossRefGoogle Scholar
  6. Lange K (1985) Handbook of metal forming. McGraw-Hill, New YorkGoogle Scholar
  7. Lutters D, Streppel AH, Huétink J, Kals HJJ (1995) A process simulation for air bending. In: Proceedings of 3rd international conference on sheet metal, p 145Google Scholar
  8. Marciniak Z, Duncan JL, Hu SJ (1992) Mechanics of sheet metal forming. Edward Arnold, LondonGoogle Scholar
  9. Roters F, Eisenlohr P, Hantcherli L, Tjanjanto DD, Bieler TR, Raabe D (2010) Acta Mater 58:1152CrossRefGoogle Scholar
  10. Serruys W (2006) Sheet metalworking, state of the art, LVD Company NVGoogle Scholar
  11. Serruys W (2011) Adaptive control in CNC sheet metal processing. Key Eng Mater 473:13CrossRefGoogle Scholar
  12. Streppel AH, Lutters D, Kals HJJ (1997) Material and geometry parameters in air bending. In: Proceedings of the 5th international conference on sheet metal, p 507Google Scholar
  13. Sun L, Wagoner RH (2011) Complex unloading behavior: nature of the deformation and its consistent constitutive representation. Int J Plast 27:1126zbMATHCrossRefGoogle Scholar
  14. Wagoner RH, Li M (2007) Simulation of springback: through-thickness integration. Int J Plast 23:345zbMATHCrossRefGoogle Scholar
  15. Wagoner RH, Lim H, Lee M-G (2013) Advanced issues in springback. Int J Plast 45:3CrossRefGoogle Scholar

Copyright information

© CIRP 2014

Authors and Affiliations

  1. 1.Centre for Industrial Management, Department of Mechanical EngineeringKU LeuvenHeverlee - LeuvenBelgium