Study on the influence of the springback on the hole expansion ratio characterization

  1. Mendiguren, Joseba 1
  2. Zubia, Biotza 1
  3. Agirre, Julen 1
  4. Galdos, Lander 1
  5. Saenz de Argandona, Eneko 1
  1. 1 Universidad de Mondragón/Mondragon Unibertsitatea
    info

    Universidad de Mondragón/Mondragon Unibertsitatea

    Mondragón, España

    ROR https://ror.org/00wvqgd19

Revista:
Materials Science: Materials Review

ISSN: 2529-7791

Año de publicación: 2018

Volumen: 2

Número: 1

Tipo: Artículo

DOI: 10.18063/MSMR.V2I1.408 GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Materials Science: Materials Review

Resumen

Material formability has become one of the main problems, together with the springback, when stamping high added-value components for the automotive industry. The pursuit of weight reduction has led to higher strength alloys which show a lower formability. Among the different formability criteria (e.g. necking, edge strain, fracture and radius cracks) the edge strain is starting to be a critical aspect on the process planning stage. In order to characterise this criteria, the hole expansion ratio (HER) is conducted under the ISO 16630 standard. In the last years, multiple authors have analysed the HER of different alloys and its dependency on different process variables i.e. cutting method, test speed, material strength. However, the influence of the springback phenomenon on the test result has not been previously analysed. In this work, the influence of the springback on the HER values has been analysed for a mild steel DX54D and a third generation steel Fortiform1050 with a novel measuring technique. From the obtained results, it can be stated that the springback has a critical influence on the characterised HER value, mainly for the third generation steel, leading to differences of about 40% on the HER limits.

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Información de financiación

The authors acknowledge the support of their industrial partner, the automotive toolmaker, BATZ S. Coop.

Financiadores

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