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Materials 2018, 11(9), 1597; https://doi.org/10.3390/ma11091597

Force Prediction for Incremental Forming of Polymer Sheets

Department of Mechanical and Mining Engineering, University of Jaén, EPS de Jaén, Campus LasLagunillas, 23071 Jaén, Spain
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Received: 29 June 2018 / Revised: 24 August 2018 / Accepted: 30 August 2018 / Published: 3 September 2018
(This article belongs to the Special Issue Special Issue of the Manufacturing Engineering Society (MES))
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Abstract

Incremental sheet forming (ISF) is gaining attention as a low cost prototyping and small batch production solution to obtain 3D components. In ISF, the forming force is key to define an adequate setup, avoiding damage and reducing wear, as well as to determine the energy consumption and the final shape of the part. Although there are several analytical, experimental and numerical approaches to estimate the axial forming force for metal sheets, further efforts must be done to extend the study to polymers. This work presents two procedures for predicting axial force in Single Point Incremental Forming (SPIF) of polymer sheets. Particularly, a numerical model based on the Finite Element Model (FEM), which considers a hyperelastic-plastic constitutive equation, and a simple semi-analytical model that extends the known specific energy concept used in machining. A set of experimental tests was used to validate the numerical model, and to determine the specific energy for two polymer sheets of polycarbonate (PC) and polyvinyl chloride (PVC). The approaches provide results in good agreement with additional real examples. Moreover, the numerical model is useful for accurately predicting temperature and thickness. View Full-Text
Keywords: incremental forming; FEM; force prediction; numerical model; semi-analytical model; specific energy incremental forming; FEM; force prediction; numerical model; semi-analytical model; specific energy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Medina-Sanchez, G.; Garcia-Collado, A.; Carou, D.; Dorado-Vicente, R. Force Prediction for Incremental Forming of Polymer Sheets. Materials 2018, 11, 1597.

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