Novel Experimental Set-Up to Investigate the Wear of Coatings for Sheet Metal Forming Tools

Abstract:

The use of PVD and CVD coatings has increased significantly thanks to the improved tribological performances they offer in many metalforming processes. Nevertheless the proper coating selection for a specific forming operation is not well established yet, being mainly based on trails and error approaches. The use of FEM-supported analyses may represent an effective support in the optimization of process parameters, but the need of testing procedures and reliable models to describe the mechanical and tribological phenomena at the interface between the dies and the workpiece is still significant. The paper presents a novel experimental set-up for the evaluation of the wear resistance of dies coatings in sheet metal forming operations. A progressive stamping process was taken as reference case and analyzed by numerical analyses. Contact pressures, temperatures and tangential loads at the tools-blank interface were evaluated in each deformation step. TiAlN and CrN were selected as reference coatings and deposited via magnetron sputtering technique. The first part of the research was focused on the design of the novel set-up capable to carry out controlled wear tests in laboratory environment, performed with the parameters obtained from the numerical simulation. The results of such experiments were compared to the ones from standard laboratory tests and with industrial trials, though measurements of loads, of surface roughness evolution and by surface investigations trough Scanning Electron Microscope observations.

• Periodical: Key Engineering Materials (Volumes 554-557)
• Pages: 825-832
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.554-557.825
• Online since: June 2013
• Authors: Francesco Sgarabotto, Andrea Ghiotti, Stefania Bruschi
• Keywords: PVD Coating, Sheet Metal Forming, Tribology, Wear

References

[1] N. Bay, A. Azushima, P. Groche, I. Ishibashi, M Merklein, M Morishita, T. Nakamura, S. Schmid, M. Yoshida, Enviromentally Benign Tribo-systems for Metal Forming, CIRPS Annals 2010.

DOI: 10.1016/j.cirp.2010.05.007

[2] S. Hogmark, S. Jacobson, M. Larsson, Design and evaluation of tribological coatings, Wear 246 (2000) 20–33.

DOI: 10.1016/s0043-1648(00)00505-6

[3] B. Podgornik, S. Hogmark, O. Sandberg, Proper coating selection for improved galling performance of forming tool steel, Wear 261 (2006) 15–21

DOI: 10.1016/j.wear.2005.09.005

[4] J. Eriksson, M. Olsson, Tribological testing of commercial CrN, (Ti,Al)N and CrC/C PVD coatings — Evaluation of galling and wear characteristics against different high strength steels, Surface & Coatings Technology 205 (2011) 4045–4051.

DOI: 10.1016/j.surfcoat.2011.02.053

[5] P. Carlsson, M. Olsson, PVD coatings for sheet metal forming processes—a tribological evaluation, Surface & Coatings Technology 200 (2006) 4654– 4663

DOI: 10.1016/j.surfcoat.2004.10.127

[6] A. Ghiotti, S. Bruschi, Tribological behaviour of DLC coatings for sheet metal forming tools, Wear 271 (2011) 2454 – 2458.

DOI: 10.1016/j.wear.2010.12.043

[7] F. Sgarabotto, A. Ghiotti, S. Bruschi, Wear evaluation of DLC-coatings for sheet metal forming tools, Proceeding of IDDRG (2011).

DOI: 10.1016/j.wear.2010.12.043

[8] F. Sergejev, P. Peetsalu, A. Sivitski, M. Saarna, E. Adoberg, Surface fatigue and wear of PVD coated punches during fine blanking operation, Engineering Failure Analysis 18 (2011) 1689–1697

DOI: 10.1016/j.engfailanal.2011.02.011

[9] G. Straffelini, G. Bizzotto, V. Zanon, Improving the wear resistance of tools for stamping, Wear 269 (2010) 693–697.

DOI: 10.1016/j.wear.2010.07.004

[10] F. Sgarabotto, A. Ghiotti, Tribological behaviour of PVD coatings for sheet metal forming tools: laboratory and industrial evaluation, Key Engineering Materials (2012) 504-506

DOI: 10.4028/www.scientific.net/kem.504-506.543

[11] K.-D. Bouzakis, N. Vidakis, T. Leyendecker, G. Erkens, R. Wenke, Determination of the fatigue properties of multilayer PVD coatings on various substrates, based on the impact test and its FEM simulation, Thin Solid Films 308–309 (1997) 315–322

DOI: 10.1016/s0040-6090(97)00561-0

[12] K.-D. Bouzakis, O. Friderikos, I. Tsiafis ,FEM-supported simulation of chip formation and flow in gear hobbing of spur and helical gears, CIRP Journal of Manufacturing Science and Technology 1 (2008) 18–26.

DOI: 10.1016/j.cirpj.2008.06.004

[13] G. Gantar, T. Pepelnjak, K. Kuzman, Optimization of sheet metal forming process by the use of numerical simulations, Journal of Materials Processing Technology 130 – 131 (2002) 54 – 59.

DOI: 10.1016/s0924-0136(02)00786-0

[14] M. Pereira, W. Yan, B. F. Rolfe, Contact pressure evaluation and its relation to wear in sheet metal forming, Wear 265 (2008) 1687–1699.

DOI: 10.1016/j.wear.2008.04.042

[15] P. Groche, N. Moeller, H. Hoffmann, J. Suh, Influence of gliding speed and contact pressure on the wear of forming tools, Wear 271 (2011) 2570-2578.

DOI: 10.1016/j.wear.2010.12.076