Development of a model to describe the process forces in cold rolling using the example of PM gears

 

Duration: January 1st, 2017 - June 30th, 2019

Funding Body: DFG

Starting Point:

The mechanical properties of PM gears are mainly determined by the local density of the material. On the one hand, pores reduce the load carrying cross section. On the other hand, every pore can be a crack initiator. PM gears are cold rolled to increase their density and, therefore, their load-carrying capacity. The influence of the contact conditions in cold rolling on the process forces is not quantified yet. The knowledge of the process force allows for a knowledge based process design in cold rolling of gears.

Research Objective:

The aim of this research project is the development of a model to describe the process forces in cold rolling based on a penetration calculation. Due to the density dependent material properties, the process forces on cold rolling of PM gears can not be described based on the state of the art.
To allow the development of a describing model of the process forces, the influence of the contact conditions on the rolling forces and, therefore, the elastic-plastic deformation of the workpiece needs to be described. Especially, the density dependent material properties need to be taken into account. The knowledge of the local material properties allows for a calculation of the resulting process forces. The knowledge of the process force enables the adjustment of the stock to the infeed and tool design and, hence, improves the gear and densification quality.




Your contact:
Tim Frech, M.Sc.
 
Manfred-Weck-Haus 115a
Tel.: +49 241 80-25371
Fax: +49 241 80-22293
Mail: T.Frech@wzl.rwth-aachen.de