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Freiburg, Germany

Stiele H.,EFD Induction GmbH | Krause C.,Eldec Schwenk Induction GmbH
Elektrowaerme International | Year: 2013

Using surface hardening processes (flame-, induction, laser-, electron beam hardening) normally a fraction of the work piece volume is austenized. This happens usually with high heating rates compared to a heating by furnace. This is the reason why the term short time austenitization is closely connected to the methods of surface hardening. In the following article the metallurgical processes and the characteristics during fast heating and short soaking times are described. Source


Schubotz S.,EFD Induction GmbH | Stiele H.,Albstadt-Sigmaringen University of Applied Sciences
Elektrowaerme International | Year: 2015

Depending on workpiece and process parameters, induction heating of components requires a certain amount of power. By simulation, experiments and experience, this needed energy can be anticipated well and enables the dimensioning of the converter. Basically, cost of the converter increases with rising provided power. Due to increasing energy expenses, efficiency of the system plays an important role. In this article, the influences of different process parameters on the efficiency of an example are investigated and valuable potential for improvement is demonstrated, so that the heating process is implemented with minimum converter power. Source


Stiele H.,EFD Induction GmbH | Brand M.,Fraunhofer Institute for Mechanics of Materials | Asperheim J.-I.,EFD Induction AS
Elektrowaerme International | Year: 2010

Due to size and costs of big slewing rings, the common methods of experimental trial and error together with destructive test methods for verification of the inductive hardening process are limited. Thereby it is essential to simulate the hardening process in addition to the tests. With these simulations, it should be possible to get conclusions for the hardening pattern, the residual stress and distortion. With actually existing methods a fully three dimensional simulation is extremely time consuming. For that reason, a new method was developed that combines two dimensional with three dimensional simulation to shorten the time for calculation tremendously. Source


Schubotz S.,EFD Induction GmbH | Stiele H.,EFD Induction GmbH
Elektrowaerme International | Year: 2014

High voltages and currents occur in converters and adjacent components used in induction heating devices (e.g. inside the matching transformer), Due to that, extensive safety systems, which are constructed differently depending on the system components, are used for personal and machine protection. In this examination, primarily the construction of an induction heating system is briefly presented and subsequently the different types of protection are discussed. Based on that, a presentation of various safety devices (transformers and monitoring systems), their functionality and the application-specific usage will be done. Source

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