Tribology in cold forging of stainless steel

  • Wibom, Ole (Project Participant)
  • Bay, Niels Oluf (Project Manager)
  • Maegaard, Viggo (Project Participant)

    Project Details


    Ph.D.: Ole Wibom
    The objectives of this project is to enhance the possibilities of cold forging stainless steel. After a comprehensive study of the state-of-the-art in tribology tests for cold forging, a system of new tribological tests have been developed to ensure an independently variation of the main tribological parameters, i.e. normal pressure, surface expansion, sliding length, sliding velocity and temperature. These simulative tests are compared with process tests carried out in production as well as in the laboratory.
    The tests are employed for classification of different lubricants. The frictional stress and the tendency to pick-up are investigated in order to set up ”Lubrication limit diagrams”. Two lubricants have been investigated: oxalate coating lubricated with molubdenumdisulfide and Zn/Ca-phosphate coating lubri-cated with Na-stearate. The latter, which is a new lubricant developed in another ph.d. project running in parallel with the present, turns out to have significantly better resistivity to lubricant breakdown.
    Effective start/end date01/11/199401/03/1998


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