Theoretical Investigation of the Bending Process of the Pre-Strained Metal Sheet

Abstract:

During the bending operation of the thin sheet materials by the punch with the near-to-zero radius the special technological operation should be carried out. It means that the metal sheet obtained a certain thinning value, which is usually done in the form of the channel-concentrator or groove by pre-drawing operation in a cold state. It follows to the pre-straining and strengthening of the material. The authors investigated the strain hardened sheet's area after roll forming process theoretically, and obtained the strain-stress distribution inside the sheet during the bending operation. It was found out that the increase of the prior deformation during pre-straining in the bend layer follows to the increase of the radial and tangential stresses and displacement of the neutral axis inside the blank during bending operation. As a result, the bending moment changes its values depends on the punch radius and strain hardening.

• Periodical: Solid State Phenomena (Volume 299)
• Pages: 351-357
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.299.351
• Online since: January 2020
• Authors: Sergey A. Tipalin*, Michael A. Petrov, Yuriy A. Morgunov
• Keywords: Galvanized Steel Band, Metal Forming, Pre-Strained Material, Roll Forming, Sheet Bending, Strain Hardening

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