Authors:
Gerrit Hellenbrand (Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University, Germany),
Lukas Klee (Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University, Germany),
Jens Brimmers (Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University, Germany),
Christian Brecher (Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University, Germany),
Thomas Bergs (Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University, Germany)
Abstract:
Due to the remaining porosity of powder metallurgical (PM) gears, the highly stressed surface is post-densified in a cold rolling process to increase the wear resistance. In this report, an approach to determine the maximum possible surface densification of a demonstrator gear is presented. To realise a high degree of deformation and simultaneously avoid spalling damages at the tip area, an adaption of the process kinematic is used. Metallographic microsections are analysed to detect subsurface damages resulting from the cold rolling process. Additionally, the machine traces concerning the upcoming rolling forces over the feed-rate and number of over-rollings are evaluated. Finally, the realised densification profile is evaluated using an image-processing tool, based on the metallographic microsections and a core-density measurement. This profile can serve as an input for an FE-based tooth contact analysis with consideration of the local density profile.
DOI:
https://doi.org/10.59499/WP225372013