Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Measuring Device for the Investigation of the Friction Mechanism in Metal Forming

Datum: 22.07.1997



  • Prof. Dr.-Ing. Dr. h.c. M. Geiger
  • Prof. Dr.-Ing. habil. H. Gläser, TU Bergakademie

In metal forming the friction phenomena influence the material flow, the surface quality of the workpiece and the wear of the forming dies. Whereas the most FEM Codes already have the capability to describe the friction as a local function, there are neither proper methods nor measuring devices which allow the experimental determination of the required data. The aim of this thesis was the development and testing of a new measuring device for the investigation of the friction mechanism in metal forming. The main part of this device is a newly developed compression test. It allows the investigation of all main parameters that influence the friction behaviour in more complex processes: the real contact area, the normal stress, the relative sliding between die and workpiece and the surface enlargement of the workpiece. Additionally, the normal stress and the relative sliding can be adjusted independently from each other. To measure the real contact area between specimen and forming die an ultrasonic method was developed. It facilitates the investigation of all the material combinations used in metal forming and due to the sharp focused sound beam it allows a good lateral resolution. However the use of the method is limited to the liquid lubricants.