Influence of Surface Modifications on Friction, Using High-Feed Milling and Wear Resistant PVD-Coating for Sheet-Metal Forming Tools

Abstract:

Increasing technological requirements, as well as the demand for an efficient production demands high performance materials and enhanced manufacturing processes. The development of a new manufacturing process, sheet-bulk metal forming (SBMF), is one approach to produce lightweight forming parts with an increased number of functional properties while, at the same time, combining the advantages of sheet and bulk metal forming. For SBMF processes, the specific adjustment of the friction between tool and workpiece for a specifically designed material flow, which is called tailored friction, is of great importance. The reduction of friction is essential in order to ensure a homogeneous forming zone. However, a higher friction can be used to control the material flow to increase the local thickness of the work piece for additional functional integration. This paper shows the development of surface structures for SBMF tools by means of high-feed milling. Process parameters like the tilt angle or the feed are varied to influence the surface parameters of the structures, which results in different tribological properties of the forming tool. The structured surfaces are subsequently coated with a wear resistant CrAlN coating, processed by a magnetron-sputtering process (PVD) to enhance the lifetime and performance of the forming tool. Finally, a ring compressing test is used to investigate the tribological behavior of the coated structures.

• Periodical: Key Engineering Materials (Volume 639)
• Pages: 275-282
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.639.275
• Online since: March 2015
• Authors: Dirk Biermann, Dennis Freiburg*, Rouven Hense, Wolfgang Tillmann, Dominic Stangier
• Keywords: Friction, Milling, PVD-Coating

References

[1] H.U. Vierzigmann, M. Merklein, U. Engel, Friction Conditions in Sheet-Bulk Metal Forming, Procedia Engineering 19 (2011) 377–382.

DOI: 10.1016/j.proeng.2011.11.128

[2] M. Merklein, J.M. Allwood, B.A. Behrens, A. Brosius, H. Hagenah, K. Kuzman, K. Mori, A.E. Tekkaya, A. Weckenmann, Bulk forming of sheet metal, CIRP Annals –Manufacturing Technology 61 (2012) 725–745.

DOI: 10.1016/j.cirp.2012.05.007

[3] H.U. Vierzigmann, M. Merklein, U. Engel, Tailored surfaces in sheet-bulk metal forming, Proc. 4th International Conference on Tribology in Manufacturing Processes (ICTMP), Nice, France, (2010) 541–550.

[4] H.U. Vierzigmann, J. Koch, M. Merklein, U. Engel, Material flow in sheet-bulk metal forming, Key Engineering Materials 504-506 (2012) 1035–1040.

DOI: 10.4028/www.scientific.net/kem.504-506.1035

[5] A. Schubert, S. Gross, J. Edelmann, B. Schulz, Laser micro structuring of high-stressed embossing dies, Physics Procedia 5, Part A, (2010) 261–268.

DOI: 10.1016/j.phpro.2010.08.145

[6] P. Sieczkarek, L. Kwiatkowski, A.E. Tekkaya, E. Krebs, P. Kersting, W. Tillmann, J. Herper, Innovative tools to improve incremental bulk forming processes, Key Engineering Materials 554-557 (2013) 1490–1497.

DOI: 10.4028/www.scientific.net/kem.554-557.1490

[7] W. Tillmann, J. Herper, I.A. Laemmerhirt, Development and Tribological Investigation of the Coating System Chromium carbonnitride (CrCN) to different Surface Designs, Journal of Materials Science and Engineering B 2 4 (2012) 223-229.

[8] W. Tillmann, J. Herper, I.A. Laemmerhirt, Tribological comparison of different surface topographies coated with chromium aluminium nitride, Materialwissenschaft und Werkstofftechnik 44 (2013) 730-735.

DOI: 10.1002/mawe.201300183

[9] P. Sieczkarek, L. Kwiatkowski, A.E. Tekkaya, E. Krebs, D. Biermann, W. Tillmann, J. Herper,: Improved tool surfaces for incremental bulk forming processes of sheet metals, Key Engineering Materials 504-506 (2012) 975-980.

DOI: 10.4028/www.scientific.net/kem.504-506.975

[10] H.U. Vierzigmann, T. Schneider, J. Koch, D. Gröbel, M. Merklein, U. Engel, R. Hense, D. Biermann, E. Krebs, P. Kersting, L. Henning, B. Denkena, J. Herper, W. Tillmann, Untersuchungen von Tailored Surfaces für die Blechmassivumformung mittels angepasstem Ringstauchversuch, Workshop Blechmassivumformung, Meisenbach, Erlangen (2013).

[11] A. Wuhrer, W.Y. Yeung, A comparative study of magnetron cosputtered nanocrystalline titanium aluminium and chromium aluminium nitride coatings, Scripta Materialia 12 (2004) 1461-1466.

DOI: 10.1016/j.scriptamat.2004.03.007

[12] W. Tillmann, E. Vogli, I. Baumann, F. Hoffmann, Functional wear resistance tool surfaces for hot metal forming processes, Journal of Steel and Related Materials 3 (2009) 217-221.

[13] S. Weidel, U. Engel, Surface characterization in forming processes by functional 3D parameters, The International Journal of Advanced Manufacturing Technology 33 (2007) 130-136.

DOI: 10.1007/s00170-006-0644-x

[14] M. Pfestorf, J. Staeves, K. Wagner, Definition von 3D-Oberflächenkenngrößen, Stahl und Eisen 117 (1997) 98-103.

[15] Kuwer, Christian-Jürgen, Verschleissreduktion beim Tiefziehen von X5 CrNi 18-10, Shaker (Berichte aus der Produktionstechnik, Bd. 2007, 22).