Effect of generatrix profile on single-point incremental forming parameters

  • Mariem Dakhli
  • Atef Boulila
  • Zoubeir Tourki


The single-point incremental forming is one of two modes of the incremental sheet forming process. It is the most used in the manufacture of parts for small series and prototypes in various sectors such as aeronautics, biomedical field, and art pieces. In this work, two geometries of parts are investigated at the same process parameters (rotation speed, feed rate, step increment, sheet thickness, and tool diameter). The experimental tests are made with a CNC spinner milling machine. The blank sheet of mild steel is formed by means of a hemispherical tool with a 10-mm diameter. The forming tool follows the desired spiral path that is determined by a CAD model. The main objective of this paper is to study the effects of the generatrix profile for two shapes of a truncated cone (straight and circular generatrix) on forming forces, thickness distribution, shape accuracy, and surface roughness of the formed shape. Besides, a coefficient of shape is introduced from experimental and analytical vertical forces. The experimental results show that a better roughness surface quality is obtained in forming a straight generatrix and that a more uniform thickness distribution of the blank is obtained after thinning and shaping a circular generatrix. In order to examine the geometric accuracy of the parts, a Next Engine 3D scanner is used to rebuild the developed surfaces again and to make a comparison between the programmed and scanned profiles.


Single-point incremental forming Generatrix 3D scanning Thickness Shape accuracy Roughness 


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Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag London 2017

Authors and Affiliations

  1. 1.Mechanical Laboratory of Sousse, National Engineering School of SousseUniversity of SousseSousse ErriadhTunisia
  2. 2.National Institute of Applied Science and Technology, Centre Urbain NordUniversity of CarthageTunis CedexTunisia

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