Advertisement

Surface characterisation in forming processes by functional 3D parameters

  • S. WeidelEmail author
  • U. Engel
ORIGINAL ARTICLE

Abstract

Tribology in metal forming plays a significant role for process feasibility and process quality. Especially in micro forming the influence of the tribological condition is very essential due to an extensive increase in friction which is observed while scaling processes from macro to micro. As friction depends considerably on the surface topography of tool and workpiece, functional surface characterisation concerning the tribological properties becomes even more relevant. Standardised 2D roughness-measurements and -parameters are notable to fulfil this task satisfactorily. Hence the surface has to be measured three dimensionally. An appropriate method is given by confocal white light microscopy. New 3D parameters are defined with respect to the functional behaviour of the surface. These parameters are derived from a mechanical-rheological model which describes the transmission of the forming load from the tool to the workpiece. In order to calculate these parameters, the software WinSAM has been developed. Especially the maximum closed void area ratio and the volume of closed lubricant pockets have already proven their capability of characterising the tribological behaviour of the surfaces in the macro world. It is expected that these parameters are a basis for a functional characterisation of the topography in micro-forming applications as well.

Keywords

Metal forming Surface characterisation Tribology 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Popp U, Neudecker T, Engel U, Geiger M (1999) Surface characterization with regard to the tribological behaviour of sheet metal in forming processes. Proc 7th Int Conf on Sheet Metal, Erlangen, pp 303–310Google Scholar
  2. 2.
    Popp U, Weidel S, Engel U (2005) Charakterisierung von lasererzeugten Mikrostrukturen. In: Geiger M, Polster S (eds) Laser in der Elektronikproduktion & Feinwerktechnik LEF2005. Meisenbach Bamberg, pp 175–183Google Scholar
  3. 3.
    Geiger M, Engel U, Pfestorf M (1997) New developments for the qualification of technical surfaces in forming processes. Ann CIRP 46(1):171–174Google Scholar
  4. 4.
    Blunt L, Jiang X (eds) (2003) Advanced techniques for assessment surface topography. Kogan Page, LondonGoogle Scholar
  5. 5.
    Engel U (2004) Tribology in microforming. Proc 2nd Int Conf on Tribology in Manufacturing Processes ICTMP, vol. 2. Nyborg, Denmark, pp 549–560, 15–18 June 2004Google Scholar
  6. 6.
    Lonardo PM, De Chiffre L, Bruzzone AA (2004) Characterisation of functional surfaces. Proc 2nd Int Confon Tribology in Manufacturing Processes ICTMP. Nyborg, Denmark, 15–18 June 2004Google Scholar
  7. 7.
    Brinkman S, Bodschwinna H (2003) Advanced gaussian filters. In: Blunt L, Jiang X (eds) Advanced techniques for assessment surface topography. Kogan Page, London, pp 63–91CrossRefGoogle Scholar
  8. 8.
    Popp U, Engel U (2004) Micro texturing of cold forging tools - influence on tool life. Proc 2nd IntConf on Tribology in Manufacturing Processes ICTMP. Nyborg, Denmark, pp 285–291Google Scholar
  9. 9.
    Tiesler N, Engel U, GeigerM (1999) Forming of microparts - effects of miniaturization on friction. In: Geiger M (ed) Advanced Technology of Plasticity, Proceedings of the 6th Int Conf on Technology of Plasticity ICTP 1999, 19–24 Sep 1999, Nuremberg, Germany. Vol. II. Springer, Berlin Heidelberg New York, pp 889–894Google Scholar
  10. 10.
    Sobis T, Engel U, Geiger M (1992) A theoretical study of wear simulation in metal forming processes. J Mater Process Techno l34:233–240CrossRefGoogle Scholar
  11. 11.
    Pfestorf M (1997) Funktionale 3D-Oberflaechenkenngroessen in der Umformtechnik. In: Feldmann K, Geiger M (eds) Fertigungstechnik Erlangen. Meisenbach, BambergGoogle Scholar
  12. 12.
    Geiger M, Engel U, Niederkorn S, Pfestorf M (1996) Messtechnische Erfassung der Wirkflächenvorgänge in der Umformtechnik. Tribologie und Schmierungstechnik 43(3):113–119Google Scholar
  13. 13.
    Sobis T (1996) Beitrag zur Mechanik der Mischreibung in der Wirkfuge umformtechnischer Prozesse. Reihe PSU Prozesssimulation in der Umformtechnik, Bd. 10. Springer, Berlin Heidelberg NewYorkGoogle Scholar
  14. 14.
    Steffensen H, Wanheim T (1977) Asperities on asperities. Wear 43:89–98CrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Limited 2006

Authors and Affiliations

  1. 1.Manufacturing TechnologyUniversity of Erlangen-NurembergErlangenGermany

Personalised recommendations