Design and validation of a fixture for positive incremental sheet forming

Muftooh Ur Rehman Siddiqi, Jonathan R. Corney, Giribaskar Sivaswamy, Muhammad Amir, Rahul Bhattacharya

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Incremental sheet forming is an emerging manufacturing technique in which sheet metal is formed into desired shape through the application of localized force using a hemispherical tool. Potential advantages of the process are its relatively low cost and small lead times, and these have to be balanced against the disadvantages of low dimensional accuracy and a limited understanding of the process’ internal mechanics. Incremental sheet forming system can be classified as positive, or negative, depending on whether the sheet material is progressively deformed onto a protrusion or a cavity. In negative systems, the work piece is held on a static fixture; whereas, in positive incremental sheet forming, the fixture must be incrementally lowered onto a protruding die. Although the vertical movement of positive incremental sheet forming fixtures is easily illustrated schematically, its implementation is challenging; if the descent is actuated, the motion has to be carefully coordinated with those of the forming tool; if free sliding on vertical columns, the rig must move without jamming or rocking. This article reports the development and testing of a positive incremental sheet forming fixture design that uses nylon sleeve bushes. Symmetric and asymmetric components were formed using the designed fixture, modular wooden dies and a rotating tool with multiple diameters and the results are discussed.

LanguageEnglish
Pages629-643
Number of pages15
JournalProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Volume232
Issue number4
Early online date19 Apr 2017
DOIs
Publication statusPublished - 1 Mar 2018

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Jamming
Sheet metal
Mechanics
Testing
Costs

Keywords

  • fixture design
  • Incremental sheet forming
  • sheet strains
  • sheet thickness

Cite this

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Design and validation of a fixture for positive incremental sheet forming. / Siddiqi, Muftooh Ur Rehman; Corney, Jonathan R.; Sivaswamy, Giribaskar; Amir, Muhammad; Bhattacharya, Rahul.

In: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, Vol. 232, No. 4, 01.03.2018, p. 629-643.

Research output: Contribution to journalArticle

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