VDI conference "Shafts and Shaft-Hub Connections"
Efficient shafts and shaft-hub connections thanks to strength-enhancing deep rolling
How should shafts and shaft-hub connections be designed, and what are the latest scientific trends and findings? These were the topics of the VDI conference "Shafts and Shaft-Hub Connections" on November 6 and 7, 2024 in Munich/Garching. Approximately 65 participants spent two days exploring intensively many different facets of this topic.
The expert presentations included the joining of sheet metal stacks on shafts for electric motor production, the design of torsionally loaded shafts made of fiber composite materials and the evaluation of surface characteristics in quality assurance during production. In other words, it was a colorful mix across the world of shafts and shaft-hub connections.
As a glance at the lecture program shows, deep rolling of shafts was an important topic. Two presentations were dedicated to this process in the section "processes for surface treatment".
Process-reliable and targeted increase in the strength of notched shafts by deep rolling was presented
Stefanie Günther from the Technical University of Dresden presented results of the FVA project 840-II of the Research Association for Drive Technology (FVA) on behalf of a larger group of researchers, which deals with the evaluation of deep rolled notched shafts in structural design. During this project, a large number of strength tests were carried out on shafts made of different materials, notch geometries and diameters. In addition, the loads tensile-compression, torsion and bending circulation were tested, thus creating a very large database.
In her presentation, she first introduced deep rolling as a process, in this case processing with a mechanical single-roller deep rolling tool EG5 with a 40M roller. The strength-enhancing effect was very impressive. In one case, an outstanding result of +93% was achieved.
In the following lecture, Dr.-Ing. Oliver Maiß, Head of Research and Development at ECOROLL, presented the possibilities of how compressive residual stresses can be introduced in a process-safe manner and what potential is offered by the previously shown increase in strength for lightweight construction, and how this can reduce the CO2 footprint of a component.
Inspired by these two presentations, many interesting discussions unfolded at the ECOROLL booth during the accompanying trade exhibition, which Dr. Maiß and our sales representative for Bavaria, Peter Schmidt, were more than happy to hold during the coffee breaks.
