Design and Adaptation of EMF Equipment

Abstract

Since the electromagnetic forming (EMF) becomes more and more accepted within industrial manufacturing, the methods engineer has to deal with the choice of matching equipment as to perform the task of production in the best possible way. At the present time several manufacturers offer EMF-machines with different characteristics, whereby the machines consist of a pulse power generator and an exchangeable tool coil. The storable energy, the current capability and a high short circuit frequency enable the engineer to adapt tool coils for an optimised pressure course. In the following some aspects of how to dimension direct acting tool coil properties for the EM compression process will be considered. Basically the use of multi-turn coils is advantageous for a good matching. But in a lot of cases the use of a fieldshaper is necessary. It will be shown how the design of a tool coil system including a fieldshaper influences the pressure course. A special case is the application of EM compression in closed spaceframe structures for which a separable tool coil is required. A separable compression coil with non-welding contact elements will be presented.