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Contenuto archiviato il 2024-04-30

Optimisation of process parameters of the "automatic pressure gelation" process for the production of high quality electrically insulating parts of duroplastics cast resin mouds

CORDIS fornisce collegamenti ai risultati finali pubblici e alle pubblicazioni dei progetti ORIZZONTE.

I link ai risultati e alle pubblicazioni dei progetti del 7° PQ, così come i link ad alcuni tipi di risultati specifici come dataset e software, sono recuperati dinamicamente da .OpenAIRE .

Risultati finali

The simulation of the curing process in an early stage of designing components, associate tools and choosing manufacturer process data, contributes essentially to the optimisation of the casting process and avoids time otherwise needed for experiments. The required output of the simulation are the computer based prescription of the resin system, the tool geometry and heating power, the filling time, the usage time of the tool, the post hardening time and temperature, the remaining cooling shrinkage. To achieve such a complex work, several partners were necessary: the software developer, the insulating parts producers, the casting equipment manufacturer, the tool manufacturer, the material data analyst and the expert on the domain of quality appreciation of the insulating parts. It was only recently that such a co-operation was realised. The main achievement of the work is the simulation program SimDur elaborated at Darmstadt, University of Technology. In order to prove useful the software was manufactured for high performance, completely automated experimental casting equipment. The design of this equipment is the intellectual propriety of the company HEDRICH Vakuumanlagen. The companies MEWAG, EPRO and Zelisko manufactured the necessary tools for the casting experimentations. The kinetic and thermodynamic material data, necessary to perform simulations were measured with specific computer based measuring DSC (Differential Scanning Calorimeter) and the viscosity behaviour of the fluid epoxy resin system were established with specific measuring equipment (Magnetoviscosimeter). Simulations with the program SimDur for insulated parts and epoxy resin systems (which were indicated by the SME core group) were performed at Darmstadt, University of Technology. The simulations were performed with the program SimDur and verified by experimental activities to measure the temperature distribution inside the tool during the hardening process. The last step of this enumeration is the quality appreciation of the insulated mould parts under various conditions resulting from the simulation. These activities were performed by LEMKE using the Partial Discharge Technology. A supplementary item was the determination of the quality of the fluid resin system before the casting, if affected by humidity (<1%) during the storage. This determination eliminates possible wrong conclusions resulting from wrong input conditions. Specimens with given humidity content were moulded and the electrical properties of the resulting thermosets were measured depending on the source frequency and voltage and on the temperature.

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