Gerhard Hirt

TL;DR: In this paper, the coining process of sheet metal to produce channel and rib structures is examined in terms of geometrical die parameters and tool design, and extensive experimental series and numerical simulations have been realized and evaluated.

TL;DR: Regarding the increasing demand on annular components with complex geometries, a flexible process has been developed at the IBF to profile sleeve shaped rings to predict the material flow in axial and tangential directions to manufacture complex geometry reproducibly.

TL;DR: In this paper, the results obtained from the experimental investigations performed on the production of steel clad strips by vertical twin-roll strip casting with a combination of the austenitic stainless steel 1.4301 and the carbon steel 2.1248 are presented.

Abstract: This paper presents both the effect of cutting on the material behavior of a typical used NGO electrical steel grade M230-30A as well as a study of the effect of annealing temperature after cold rolling on microstructure and magnetic properties beginning with an industrial hot rolled 2.4 wt.% Silicon steel of 2.0mm thickness. Modifications in the local mechanical properties due to the cutting process are investigated in detail. A quantitative analysis of the impact of material degradation for non-oriented electrical steels applied in traction drives is presented. In order to consider the large speed range of drives in automotive applications and the presence of higher harmonics, this analysis is conducted for a wide range of frequencies and magnetic polarizations. Nanoindentation is used to analyze the effect of strain from cutting on the hardness near the surface. A major conclusion is that it is indispensable to take into account influences due to material processing on magnetic materials properties during the design process of electrical machines.

TL;DR: In this article, an approach for the simulation of static recrystallization of austenitic grains is presented which is based on the coupling of a crystal plasticity method with a multiphase field approach.