Investigations about the Single Point Incremental Forming of Anisotropic Titanium Alloy Sheets

Abstract:

The present work focuses the attention on the Single Point Incremental Forming (SPIF) of the Titanium (Ti) alloy Ti-6Al-4V. Tensile tests were carried out using the optical strain measurement system Aramis3D, in order to determine the mechanical behaviour of the alloy and to investigate the anisotropy of such alloy. Finite Element (FE) simulations of the SPIF process (using ABAQUS/explicit) were performed using a simple but non-axialsymmetric shape (truncated pyramid) with the aim of investigating the effect of both the tool/pitch ratio (D/p) and the draw angle (α), taking into account the anisotropic behaviour. The analysis of plastic strains and thinning maps, together with the evaluation of shape errors originated by the forming process, highlighted that the parameter D/p plays a key role in the SPIF. Results from the preliminary FE analysis were used for investigating the production by SPIF of an automotive component (car door shell). A specific subroutine was created by the authors for automatically generating the tool path to be used in both the FE simulations and the manufacturing of parts by SPIF on a CNC milling machine.

• Periodical: Advanced Materials Research (Volumes 264-265)
• Pages: 188-193
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.264-265.188
• Online since: June 2011
• Authors: G. Palumbo, Marco Brandizzi, G. Cervelli, M. Fracchiolla
• Keywords: Anisotropy, Finite Element, Single Point Incremental Forming (SPIF), Ti Alloys

References

[1] Jeswiet J, Geiger M, Engel U, Kleiner M, Schikorra M, Duflou J, Neugebauer R, Bariani P, Bruschi S: Metal forming progress since 2000, (2008) CIRP J. of Manuf. Sci. & Tech. 1, 2–17.

DOI: 10.1016/j.cirpj.2008.06.005

[2] Lai CP, Chan LC, Chow CL: Effects of tooling temperatures on formability of Titanium TWBs at elevated temperatures, (2007) J. of Mater. Proc. Tech. 191, 157–160.

DOI: 10.1016/j.jmatprotec.2007.03.094

[3] Maidagan E, Zettler J, Bambach M, Rodríguez PP, Hirt G: New incremental sheet forming process based on a flexible supporting die system, (2007) Key Eng. Mater. 344, 607-614.

DOI: 10.4028/www.scientific.net/kem.344.607

[4] Franzen V, Kwiatkowski L, Martins PAF, Tekkaya AE: Single point incremental forming of PVC, (2009) J. of Mater. Proc. Tech. 209, 462–469.

DOI: 10.1016/j.jmatprotec.2008.02.013

[5] Jeswiet J, Micari F, Hirt G, Bramley A, Duflou J, Allwood J: Asymmetric single point incremental forming of sheet metal, (2005) Annals of CIRP 54, 623–650.

DOI: 10.1016/s0007-8506(07)60021-3

[6] Filice L, Fratini L, Micari F: Analysis of material formability in Incremental Forming, (2002) Annals of CIRP 51/1, 199-202.

DOI: 10.1016/s0007-8506(07)61499-1

[7] Emmens WC, van den Boogaard AH: An overview of stabilizing deformation mechanisms in incremental sheet forming, (2009) J. of Mater. Proc. Tech. 209, 3688–3695.

DOI: 10.1016/j.jmatprotec.2008.10.003

[8] Kim Y, Park JJ: Effect of process parameters on formability in incremental forming of sheet metal, (2002). J. of Mater. Proc. Tech. 130-131, 42-46.

DOI: 10.1016/s0924-0136(02)00788-4

[9] Ambrogio G, Filice L, Fratini L, Micari F: Some relevant correlations between process parameters and process performance in Incremental Forming of metal sheets, (2003) Proc. of the 6th Esaform, 28-30 April, Salerno-Italy, 175 – 178.

[10] Hirt G, Junk S, Witulski N: Incremental sheet forming: quality evaluation and process, simulation, (2002) Proc. of 7th ICTP, 925-930.