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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2018 - 201912020 - 20222
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Autor: Domingo Navas, María Rosario × search.filters.applied.f.itemFacultad: E.T.S. de Ingenieros Industriales ×

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Mostrando 1 - 3 de 3
  • Miniatura
    Publicación
    A Multi-Response Optimization of Thrust Forces, Torques, and the Power of Tapping Operations by Cooling Air in Reinforced and Unreinforced Polyamide PA66
    (MDPI, 2018-03-20) Domingo Navas, María Rosario; Agustina Tejerizo, Beatriz De; Marín Martín, Marta María
    The use of cooling air during machining is an environmentally conscious procedure, and its applicability to different processes is a research priority. We studied tapping operations, an important operation in the assembly process, using cooling air with unreinforced polyamide (PA66) and polyamide reinforced with glass fiber (PA66-GF30). These materials are widely used in industry, but their behavior with respect to tapping has not been studied. We analyze the outcomes regarding the thrust force, torque, and power at cutting speeds between 15 and 60 m/min. The experimental tests were executed using cooling air at 22 °C, 2 °C, and −18 °C in dry conditions. The M12 × 1.75 mm taps were high-speed steel, with cobalt as the base material and coatings of TiN and AlCrN. To identify the more influential factors, an analysis of variance was performed, along with multi-response optimization to identify the desirability values. This optimization shows that the optimum for PA66can be found in environments close to 3 °C, while the optimum for PA66-GF30 is found at the minimal temperature studied (−18 °C). Thus, cooling air can be considered an adequate procedure for tapping operations, to increase the sustainability of the manufacturing processes.
  • 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
    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.