Influence of tool surface on tribological conditions in conventional and dry sheet metal forming

  • Marion Merklein
  • Kolja Andreas
  • Jennifer SteinerEmail author


The realization of lubricant free forming processes is motivated by an increasing demand for resource efficiency and higher environmental standards. Further potentials are the reduction of production steps and time. The dry conditions lead to an intensive interaction between tool and workpiece. Increasing friction and wear are the consequences. One approach to face these challenges is the implementation of tailored tool surfaces. Within this study the behavior of different tool surfaces under dry and lubricated conditions is investigated. In this regards, a flat strip drawing test was conducted to determine the friction coefficients depending on the tool surface properties resulting from various machining processes. Furthermore, a surface characterization before and after the experiments was performed to gain knowledge about the wear mechanisms. The tests series with dry strips lead to a higher friction level. Furthermore, the results show that the friction can be reduced when the grinding marks are orientated transversal to the drawing direction. A further friction reduction is achieved when applying polished tools.


Sheet metal forming Tribology Dry forming 



Amount of lubrication


Normal pressure


Relative velocity


Number of repetition


Friction force


Normal force


Upper friction force


Lower friction force


Friction coefficient


Averaged roughness height


Cut off length


Short-wave profile filter


Sampling length


Measuring length


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Copyright information

© Korean Society for Precision Engineering 2015

Authors and Affiliations

  • Marion Merklein
    • 1
  • Kolja Andreas
    • 1
  • Jennifer Steiner
    • 1
    Email author
  1. 1.Institute of Manufacturing TechnologyFriedrich-Alexander-University Erlangen-NurembergErlangenGermany

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