The purpose of this final project is to design and calculate a piston for a large two-stroke diesel engine. They are used in railroad, marine or stationary services. They are very big and heavy, all the parts have to be very well studied and calculated. Modelling process has different parts but it has to be understood what we want to achieve, the optimal shape of the piston to obtain maximum performance. The piston itself has four different main parts that should be taken into account: the crown, piston rings, hubs and the skirt. The crown takes a very important part in the whole process. It is the part that supports most of the loads and heat. As a consequence is the one that suffers the hardest deformation. The piston object of study is very large, it has to be thought a refrigeration system inside the crown to relief some of the heat stresses. As the object is to see under certain conditions how the piston works, at first it has to be understood how work the different parts mentioned before. So that we can get the optimal and correct results we are looking for. When working, the piston is subjected to a treatment of thermal stresses and force stresses. Both of them acting against the piston and causing a deformation on it. At first, the working conditions have to be very well defined. That way the results obtained will be the most accurate to reality as possible. The materials used for the construction of it also play a very important role in the whole process. Given different materials the deformations and the heat flow will be, of course, different. In the modelling process has to be chosen the one that gives better results taking into account different factors.

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