Browsing by Author "Anglada, E."
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Item Analysis of the upward direct chill casting of magnesium alloys(Curran Associates, 2006) Landaberea, A.; Pedros, P.; Anglada, E.; Garmendia, I.; CIRMETALThe upward direct chill casting, where the continuous casting is operated vertically against gravity, is a novel technology which has been applied to the production of high quality magnesium alloys circumventing the main disadvantages of using conventional continuous casting processes, since the risks of burning and explosion are practically eliminated. This represents a key aspect to increase the industrial application of magnesium wrought products. In order to help on the understanding of the process, a mathematical model for the simulation of the upward continuous casting of round billets of magnesium alloys has been developed. The equations for the flow field with heat transfer are numerically solved by a finite volume method and the solidification is accounted via an enthalpy-porosity formulation where the mushy region is modeled as a pseudo porous medium. The obtained temperature distribution is then used as input for a thermo-mechanical analysis to determine the deformation and stress field developed in the billet during the casting process. Several configurations have been simulated and comparison of computed results with available experimental data is provided.Item Development of a simulation procedure for the evaluation of new refractories for aluminium furnaces(World Foundry Organization, 2014) Vicario, I.; De Landia, L.; Toledo, N.; Mendizabal, G.; Anglada, E.; Rodriguez, P.; PROMETAL; CIRMETALRefractory materials for aluminium industry are designed to be resistant to different degrees of thermal, mechanical and chemical wear. The refractory wall thickness reduction during service life increases the heat losses through walls decreasing the thermal efficiency of the furnace. Last developments are focused on obtaining refractories with better performance and improved insulation properties. On this regard, a simulation procedure has been developed to compare the thermal and chemical performance of different refractories during end use. This procedure includes measuring the internal and external wall temperatures of a testing furnace using thermography, and comparing the resistance to liquid aluminium determining the corundum and cracks appearance. Two refractories have been tested by this procedure for comparative purposes; a commercial alumina castable and an improved alumina castable with better insulation properties.Item More robust processes and more added value for foundries based on inverse modelling and tailor-made software tools(World Foundry Organization, 2014) Meléndez, A.; Anglada, E.; Maestro, L.; Domínguez, I.; Tecnalia Research & Innovation; CIRMETALWith this work the authors want to show how is possible to approach improved simulations to the results of the user's plants giving a good solution for the increasing needs of accuracy. In this sense, the authors want to present an innovative experience concerning to a recently finished R&D project, which involved the development of two solutions using and complementing a commercial simulation software. The first of them is an improvement of the conventional simulations based on the use of the inverse modelling and the second one consists of a new 'ad hoc' tool developed especially for the customer. Once the project was concluded, as planned, the 'new current' simulations resulted well correlated with the plant. The casting process involved in the project is the investment casting process or lost wax casting process.Item The vacuum tribology model (VTM) of tribolab(2003) Garmendia, I.; Landaberea, A.; Anglada, E.; Fernández-Sanz, R.; Santiago, R.; Herrada, F.; Encinas, J. M.; CIRMETALTriboLAB is a tribology instrument that is planned for installation in the EuteF Flight Segment Platform [1], along with several other European scientific instruments. Eutef will be fixed onto an Express Pallet Adapter (ExPA), which provides standard structural, mechanical, electrical and communications interfaces to the Columbus External Payload Facility of the International Space Station (ISS). As a part of the model philosophy, a vacuum tribological model (VTM) has been developed to generate "on ground" tribological data of selected lubricants. The idea is to compare the results obtained "on ground" with those that will be produced in the space, in order to investigate the different behaviors of same tribological films and to be able to compare the performance of specific lubricants in Low Earth Orbit (LEO) conditions. The VTM is composed of six double experiment cells that perform respectively ball bearing (BB) experiments (with liquid and solid lubrication) and pin-on-disk (PoD) tests of solid lubricants. Thin films of alloyed MoS 2 are being tested in the VTM under controlled vacuum conditions. In this work, the two sections of the VTM are described.