Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Basic Investigation of Laser Texturing of Cold Forming Tools

Datum: 31.10.2006



  • Prof. Dr.-Ing. Dr.-Ing. E.h. mult. Dr.h.c. M. Geiger
  • Prof. Dr.-Ing. habil. K. Steinhoff

Cold forming is indispensable for the economic mass production of parts in high quality. The tools used in cold forming encounter a high tribological load due to the sliding work piece and the very high contact stress in the contact area. This results in wear and limits the tool life. To increase tool life it is therefore necessary to reduce wear ? especially the surfaces of tool and work piece are important in this context. With respect to the tools it is common to have surfaces with a high quality finish, to use high quality materials or to utilize hard coatings. Within this work a different approach was chosen to improve the tool life. Small valleys in the tool?s surface with dimensions in the range of microns are produced by laser ablation. They act as so called lubricant pockets. That means they store lubricant at the beginning of the forming process and release it during the production. This improves friction and wear significantly leading to increased tool life. A suitable texturing strategy and appropriate texturing parameters for real forming tools were found by means of different basic experiments. The micro texture was applied to real forming tools and investigated in the press shops of industrial partners. The results, as measured by the tool life, clearly indicate the improvement by laser texturing. With several types of tools it was possible to achieve nearly a doubled tool life.