On the formability of hole-flanging by incremental sheet forming

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Silva, MB (Author) Other; Pedro Teixeira (Author) FEUP; Ana Reis (Author) FEUP; Martins, PAF (Author) Other

Journal

Title: Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications

Vol. 227

Pages: 91-99

ISSN: 1464-4207

Publisher: SAGE

Indexing

ISI Web of Knowledge - 12 Citations

Scopus - 22 Citations

Other information

Authenticus ID: P-005-1S1

DOI: 10.1177/1464420712474210

Abstract (EN): Hole-flanging by incremental sheet forming is developing as an innovative metal forming technology for flexible small batch-production of cylindrical or conical flanges in blanks with pre-cut holes. The process is seen as an alternative to hole-flanging by conventional press-working due to significant cost savings through the replacement of complex press-tools by simple dieless forming apparatuses and to widespread belief that the limiting forming ratio of hole-flanging by incremental sheet forming is always higher than that of hole-flanging by conventional press-working. This article focuses on the aforementioned assumption and investigates the influence of material failure by necking and fracture on the limiting forming ratio. The experimental work is performed in a CNC machining center and a hydraulic press equipped with apparatuses for multi-stage single point incremental forming and conventional press-tooling, and the strain loading paths resulting from each forming process are determined by circle grid analysis. Results in Aluminium AA1050-H111 and Titanium (grade 2) blanks demonstrate that contrary to what has often been said in the literature there are process operating conditions leading to higher limiting forming ratio of hole-flanging by conventional press-working than by incremental sheet forming due to closeness of the forming limit curve and fracture forming limit line in the principal strain space.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9