Contribución al estudio de la rugosidad superficial obtenida mediante el proceso de fresado en alta velocidad, en la fase de acabado, de aceros templados de moldes y matrices
- Autores: Jose Antonio Ortiz Marzo
- Directores de la Tesis: Irene Buj Corral (dir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2018
- Idioma: español
- Tribunal Calificador de la Tesis: Fernando Romero Subirón (presid.), Guillermo Reyes Pozo (secret.), José Antonio Travieso Rodríguez (voc.)
- Programa de doctorado: Programa de Doctorado en Ingeniería Mecánica, Fluidos y Aeronáutica por la Universidad Politécnica de Catalunya
- Materias:
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- Resumen
The production of components of the moulds and dies sector is increasingly demanding. On the one hand, a better manufacturing quality is required, that requires, among other aspects, the improvement of the surface finish, and on the other hand, a continuous reduction of production times and costs, in order to be more competitive. Based on these needs, taking into account the industrial experience of the doctoral student in the sector of machining of mould and dies components, the motivation and purpose of this doctoral thesis, developed in the Mechanical Engineering Department of the Universitat Politècnica de Catalunya (UPC), where the necessary facilities and equipment are available to perform the experimental tests and analyze the results, which constitute a new contribution to High Speed Machining (HSM).
In the present thesis have been studied and analyzed the different factors that influence the surface finish obtained by the high speed milling technology, on different pieces type, representing some of the geometries present in the components of molds and dies, manufactured with different hardened steels with different hardness, depending on the material and its application. The milling process has been studied, with the operations of copying and contouring. On the one hand, the effect of different aspects of the machining on the surface roughness has been determined: the machine-tool and its numerical control (CNC), the materials of manufacture of the moulds and dies, the software of design / machining (CAD / CAM ), the tools and their cutting conditions, the work clamping systems and the tool attachment to the machine and the lubrication systems. On the other hand, from the methodology of the design of experiments, mathematical models have been found that allow to relate the cutting parameters with the surface roughness obtained in different concrete cases. Based on the knowledge of the influence of the most significant parameters and the limitations of the technologies involved, the operators will be able to carry out the preparation and programming of the machine tool in a more appropriate way, more adapted to their own machining process. If the numerical control program, or the CAM simulation software, allows the introduction of the predictive mathematical model, one can adapt the cutting conditions proper for each specific case (cutting speed, feed per tooth, axial or radial cut depth) and obtain a preliminary estimate of the surface roughness that is going to be obtained in the process.
Finally, it should be noted that the experimental studies of the present doctoral thesis have been possible because they have been part of the competitive project DPI-2003-04727: Predictive model of the surface finish of moulds and dies made with steel by high-speed milling. Project co-financed by the Ministry of Education and Science, with aid for the realization of research projects within the framework of the National Plan R+D+I 2000-2003.
Keywords: Surface Finish, Hardened Steels, High Speed Milling, Moulds, Dies, Roughness.
