Persona:
Agustina Tejerizo, Beatriz De

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0000-0003-0149-6928
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Agustina Tejerizo
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Beatriz De
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2020 - 20223
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Autor: Agustina Tejerizo, Beatriz De × Fecha de finalización: 2022 × Fecha de inicio: 2020 × Tipo de ítem: Publication × Tiene archivos: true ×

Resultados de la búsqueda

Mostrando 1 - 3 de 3
  • Miniatura
    Publicación
    Study of Drilling Process by Cooling Compressed Air in Reinforced Polyether-Ether-Ketone
    (MDPI, 2020-04-22) Domingo Navas, María Rosario; Agustina Tejerizo, Beatriz De; Marín Martín, Marta María
    This study is focused on the application of a cooling compressed air system in drilling processes; this environmentally friendly technique allows removing material at very low temperatures, approximately up to −22 °C in the cutting area. The main goals are to find the most improve cutting conditions with less energy consumption, for the drilling of reinforced polyether-ether-ketone with glass fiber at 30% (PEEK-GF30) with cooling compressed air by a Ranque-Hilsch vortex tube, and to find a balance between environmental conditions and adequate process performance. Drilling tests were carried out on plates of PEEK-GF30 to analyze the influence of cutting parameters and environmental temperature (–22, 0 and 22 °C) on variables such as thrust forces, energy and material removed rate by the use of statistical methods; analysis of variance, analysis of means, response surface, and desirability function were employed to identify the optimum region that provides the most improved values of the aforementioned variables. Drill bit diameter was also analyzed to determine the quality of drilled holes. During the drilling processes, force signals were detected by a piezoelectric dynamometer connected to multichannel amplifier and a pyrometer was used to control the temperature. The diameters of the drilled holes were measured by a coordinate measuring machine. Cooling compressed air can be considered an adequate technique to improve the results from an environmental and efficient perspective; in particular, the maximum desirability function was found at a spindle speed of 7000 rpm, a feedrate of 1 mm/rev and a temperature close to −22 °C.
  • Miniatura
    Publicación
    Geometric Optimization of Drills Used to Repair Holes in Magnesium Aeronautical Components
    (MPDI, 2020-11-18) Berzosa Lara, Fernando; Davim, J. Paulo; Rubio Alvir, Eva María; Agustina Tejerizo, Beatriz De
    Magnesium alloys are used in the aeronautical sector due to their excellent strength/weight ratios, motivated by the reduction of weight that their use entails. In this sector, drilling is one of the most common operations, if not the most, due to the large number of holes that are used in joining processes, mainly by riveting. The appearance of cracks is a risk to the structural safety of the components, such that it is necessary to regularly check them for maintenance and/or repair tasks. The present study tries to determine the optimization of the characteristics of the twist drills, which are re-sharpened successively to restore the cutting edge after use, as well as the operating parameters in machining. For this purpose, a full factorial experimental design was established, analyzing through the analysis of the variance (ANOVA) the response variables. Surface integrity was considered to carry out a global vision of the quality obtained, covering as response variables the surface roughness, the size of the burrs and the modification of the hardness produced, in addition to a topological characterization by optical means of machined surfaces. The main conclusion is that it is possible that the geometric optimization of the tools and the operating parameters considered in this study in drilling processes allow them to be performed, while maintaining quality and environmental requirements, and at the same time, maximize the productivity of operations.
  • Miniatura
    Publicación
    Estudio de la fuerza de avance y la circularidad de los agujeros en el taladrado criogénico de materiales compuestos con aramida
    (['Universidad Nacional de Educación a Distancia (España)', 'Universidad Politécnica de Madrid. Departamento de Ingeniería Mecánica'], 2022) Rodríguez Martín, Manuel; Domingo Navas, María Rosario; Ayllón Pérez, Jorge; Agustina Tejerizo, Beatriz De
    El uso de refrigerantes criogénicos en los procesos de mecanizado en los últimos años están teniendo una especial atención, así como su incidencia cuando se usan materiales compuestos, como aquellos reforzados por fibras de aramida o kevlar. Este trabajo analiza los resultados experimentales del taladrado criogénico con nitrógeno líquido en pletinas de aramida, en las fuerzas de avance, los diámetros de los agujeros taladrados y la rugosidad de las paredes, para posteriormente realizar un análisis mediante la metodología de superficie de respuesta (RSM). Este trabajo encuentra que, en el rango de las condiciones de corte empleadas, el diámetro del agujero no depende de la velocidad de rotación de la broca, mientras que la fuerza de avance y la rugosidad son dependientes de la velocidad de rotación y de avance; además aporta resultados que muestran la viabilidad de este proceso a temperaturas inferiores a -150ºC.