Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Tribological properties of ceramic sheet metal forming tools - influence of a surface finish by excimer laser radiation



Datum: 19.01.2004


Author


Reporter

  • Prof. Dr.-Ing. Dr.-Ing. E.h. mult. Dr.h.c. M. Geiger
  • Prof. Dr.-Ing. Dipl.-Wirtsch.-Ing. P. Groche, TU Darmstadt

The tribological state in the contact zone between tool and workpiece has significant influence on process boundaries, process stability, product quality and tool life. The tool, whose tribological properties are primarily determined by the material and the surface, plays a major role. Ceramic materials are especially because of their high wear resistance of increasing interest for sheet metal forming tools and are already used successfully in some cases. Actually a wider use of ceramic tools is prevented by the high costs and a knowledge deficit concerning the operating properties of ceramic parts under typical sheet metal forming loads. This thesis focuses on the influence of the surface of ceramic tools (Si3N4) on their friction and wear properties. Firstly the surface finish is done by conventional methods (grinding, lapping). Finally the two methods of surface finishing by excimer laser radiation (surface modification and micro texturing) are investigated. The tribological properties are determined by means of three model tests (strip drawing test, cup drawing test, special wear test).