Design and validation of a fixture for positive incremental sheet forming

Muftooh Ur Rehman Siddiqi (Corresponding Author), Jonathan R Corney, Giribaskar Sivaswamy, Muhammad Amir, Rahul Bhattacharya

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)629-643
Number of pages15
JournalThe Journal of Engineering Manufacture
Issue number4
Early online date19 Apr 2017
Publication statusPublished - 1 Mar 2018

Bibliographical note

The authors acknowledge AFRC, Mr Lala ZDE, Mr Dunkin, Mr Steven, Mr Barrie, Dr Dorothy Evans, Mr Umer Farooq and Miss Shahana Mujeeb for their continuous help and support.

Declaration of conflicting interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship and/or publication of this article.

Funding: The author(s) received no financial support for the research, authorship and/or publication of this article.


  • incremental sheet forming
  • fixture design
  • sheet thickness
  • sheet strains


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