Further Experimental Investigations and FEM Model Development in Sheet Incremental Forming

Abstract:

Sheet Incremental Forming (SIF) is a modern technique that deforms the sheet on a positive or negative die using a simple punch mounted on a general purpose CNC machine. Several working parameters (tool path, spiral width and tool depth) have been studied in previous papers [1, 2] analyzing their influence on a simple part when working AISI 304 or Cu DHP sheets. The main problem was to study the process feasibility, that is, the possibility of correctly deforming the pieces without breaking them. The research reported here has been focused mainly on other two important variables, studying their influence on the final part quality: the punch diameter and its velocity when deforming the sheet. Surface roughness and minimum thickness of the deformed sheet have been chosen as parameters for analyzing and evaluating the process efficiency. In FEM analysis, a simulation model was developed and implemented considering Cu DHP sheet. The comparison with experimental results was used to validate the simulation model and to identify the most suitable simulation parameter values (friction coefficient between various elements and blank holder force). The developed and validated model can be used for studying the process optimization. The results obtained in this paper can also be used as guidelines for the correct design of Sheet Incremental Forming process.

• Periodical: Advanced Materials Research (Volumes 6-8)
• Pages: 501-508
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.6-8.501
• Online since: May 2005
• Authors: Claudio Giardini, Elisabetta Ceretti, Attanasio Aldo
• Keywords: Finite Element Model (FEM), Sheet Incremental Forming SIF, Sheet Metal

References

[1] C. Giardini, E. Ceretti, A. Attanasio, M. Pasquali, Feasibility limits in sheet incremental forming: experimental and simulative analysis, The 7th Esaform conference on Material Forming, Trondheim, Norway, April 28-30, 2004, 515-518.

DOI: 10.1016/j.jmatprotec.2004.03.024

[2] C. Giardini, E. Ceretti, A. Attanasio, M. Pasquali, Analysis of the influence of working parameters on final part quality in sheet incremental forming, 3rd DIE AND MOLDS 2004, Bursa, Turkey, June 17-19, 2004, 191-198.

[3] T. Maki, Sheet Fluid Forming and Sheet Dieless NC Forming, Amino Corporation, Japan.

[4] M. Shim, J. Park, The formability of aluminium sheet in incremental forming, Journal of Materials Processing Technology 2001, 654-658.

DOI: 10.1016/s0924-0136(01)00679-3

[5] S.J. Yoon, D.Y. Yang, Development of a Highly Flexible Incremental Roll Forming Process for the Manufacture of a Doubly Curved Sheet Metal, CIRP 2003, 201-204.

DOI: 10.1016/s0007-8506(07)60565-4

[6] Y. Saotome, T. Okamoto, An in-situ incremental microforming system for three-dimensional shell structures of foil materials, Journal of Materials Processing Technology 2001, 636-640.

DOI: 10.1016/s0924-0136(01)00651-3

[7] H. Iseki, T. Naganawa, Vertical wall surface forming of rectangular shell using multistage incremental forming with spherical and cylindrical rollers, Journal of Materials Processing Technology 2002, 675-679.

DOI: 10.1016/s0924-0136(02)00735-5

[8] E. Ceretti, C. Giardini, A. Attanasio, Experimental and simulative results in sheet incremental forming on CNC machine, Journal of Materials Processing Technology 2004, 176-184.

DOI: 10.1016/j.jmatprotec.2004.03.024

[9] G. Hirt, M. Bambach, S. Junk, Modelling of the Incremental CNC Sheet Metal Forming Process, Sheet Metal 2003, 495-502.

DOI: 10.31399/asm.tb.smfpa.t53500273

[10] K. Mcloughlin, A. Cognot, E. Quigley, Dieless Manufacturing of Sheet metal Components with non Rigid Support, Sheet Metal 2003, 123-130.