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Modelling The Density Profile In Cold Rolling Of PM Gears

  • : Tim Frech1, Fritz Klocke1, Christoph Löpenhaus1
  • : 1WZL der RWTH Aachen
  • : PDF Download
  • : 2017


PM gears are pressed from alloy powders and sintered into their final shape. After the sintering process, porosity remains in the component. Due to the porosity, the mechanical properties of sintered materials are inferior to conventional steel. The inferior load carrying capacity of sintered components can be improved by densifying the highly-loaded areas. Since the mechanical properties are mainly determined by the remaining porosity, the density profile of cold rolled PM gears is of great interest. This report evaluates the influence of the process parameters of the cold rolling process on the density profile and the local mechanical properties of PM gears. The process parameters infeed, equivalent contact radius and the bulk density of PM gears are investigated. The results of the analogy trials are analysed statistically to deviate a comprehensive model which allows the determination of the density profile depending on the process parameters of the cold rolling process.


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