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Studying Formability Limits By Combining Conventional and Incremental Sheet Forming Process

Authors
  • Lora, Fabio Andre1
  • Fritzen, Daniel2
  • Alves de Sousa, Ricardo3
  • Schaffer, Lirio4
  • 1 Federal University of Recôncavo da Bahia, Campus CETENS, Feira de Santana, Bahia, 44085-132, Brazil , Feira de Santana (Brazil)
  • 2 SATC University, Criciuma, Brazil , Criciuma (Brazil)
  • 3 University of Aveiro, Aveiro, 3810-193, Portugal , Aveiro (Portugal)
  • 4 Federal University of Rio Grande do Sul, Porto Alegre, Brazil , Porto Alegre (Brazil)
Type
Published Article
Journal
Chinese Journal of Mechanical Engineering
Publisher
Springer Singapore
Publication Date
May 11, 2021
Volume
34
Issue
1
Identifiers
DOI: 10.1186/s10033-021-00562-7
Source
Springer Nature
Keywords
License
Green

Abstract

In this work it is assessed the potential of combining conventional and incremental sheet forming processes in a same sheet of metal. This so-called hybrid forming approach is performed through the manufacture of a pre-forming by conventional forming, followed by incremental sheet forming. The main objective is analyzing strain evolution. The pre-forming induced in the conventional forming stage will determine the strain paths, directly influencing the strains produced by the incremental process. To conduct the study, in the conventional processes, strains were imposed in three different ways with distinct true strains. At the incremental stage, the pyramid strategy was adopted with different wall slopes. From the experiments, the true strains and the final geometries were analyzed. Numerical simulation was also employed for the sake of comparison and correlation with the measured data. It could be observed that single-stretch pre-strain was directly proportional to the maximum incremental strains achieved, whereas samples subjected to biaxial pre-strain influenced the formability according to the degree of pre-strain applied. Pre-strain driven by the prior deep-drawing operation did not result, in this particular geometry, in increased formability.

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