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1 to 12 of 12 results
  • Ball-burnishing vibration-assisted process

     Gómez Gras, Giovanni; Travieso Rodríguez, José Antonio; González Rojas, Hernán Alberto; Napoles Alberro, Amelia Emelina; Carrillo, Francisco Javier; Dessein, Gilles
    International Research/Expert Conference ¿Trends in the Development of Machinery and Associated Technology¿
    p. 25-28
    Presentation's date: 2014-09-11
    Presentation of work at congresses

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    First of all, this work refers to the study of the ball-burnishing process assisted by a vibration. It starts by considering that this vibration helps to make the development of this finishing process easier, because it helps to deform the workpiece material more easily. Since there is no similar tool on the market, in order to conduct the study, it has been necessary to design, characterize and manufacture a tool that can perform the process, taking into account the critical components that are involved in the design, and the physical model characterizing the operation. Under these criteria, the characterization of the tool operation is also done by evaluating the surface roughness that remains after the process occurs. For experimental validation have been used work pieces of aluminium and steel. These results are compared to those obtained by the same tool without using vibration. Roughness results obtained using the ball-burnishing vibration-assisted process improves with respect to those obtained using the process without assistance, in both materials tested.

  • Cutting parameters in the minimum quantity lubricant (MQL) machining process of a gearbox

     Travieso Rodríguez, José Antonio; Gómez Gras, Giovanni; García Vilana, Silvia; Mainau Noguer, Ferran
    International Research/Expert Conference ¿Trends in the Development of Machinery and Associated Technology¿
    p. 1-4
    Presentation's date: 2014-09-11
    Presentation of work at congresses

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    Today one of the top priorities in the machining industry is to increase or retain the profit margin through cost reduction. In addition, consumers are becoming increasingly aware of the impact that the life cycle of products has on the environment, at the time of their choice. So companies are required to research and develop sustainable processes or adapt existing ones. This research has been commissioned by a company that had conducted a feasibility study showing the need to replace the machining process based on cutting fluids in their production lines with the MQL lubrication system. This paper aims to find the key process parameters for machining different parts of an automobile gearbox. It particularly focuses on the definition of appropriate cutting parameters for machining under the new condition (MQL); through a statistical method of Design of Experiments (DOE). With recommended parameters significant improvements in the surface roughness of different machined parts are shown. Production costs are also reduced by decreasing spending on lubricants and by optimizing the cycle time that is reached under the new cutting conditions.

  • Study of a ball-burnishing vibration-assisted tool

     Gómez Gras, Giovanni; Travieso Rodríguez, José Antonio; González Rojas, Hernán Alberto; Napoles Alberro, Amelia Emelina; Carrillo, Francisco; Dessein, Gilles
    International Reseach/Expert Conference "Trends in the Development of Machinery and Associated Technology"
    p. 101-104
    Presentation's date: 2013-09-11
    Presentation of work at congresses

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    This work first of all, talks about the characterization of vibrating plates of a ball-burnishing tool assisted by a vibration. This vibration helps to make easier the development of this finishing process, because it helps more easily deform the workpiece material. Optimum dimensions for the plates of the tool are obtained, as well as the mathematical model that characterizes operation.

  • Ball-burnishing process influence on hardness and residual stresses of aluminium A92017

     Travieso Rodríguez, José Antonio; González Rojas, Hernán Alberto; Gómez Gras, Giovanni; Dessein, Gilles; Alexis, Joël
    International Research/Expert Conference ¿Trends in the Development of Machinery and Associated Technology¿
    p. 97-100
    Presentation's date: 2013-09-11
    Presentation of work at congresses

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    The ball-burnishing process is done firstly, to improve the surface finish of workpieces that have been previously machined and secondly, to obtain a harder surface with a compressive residual stress map. In this way we will obtain a surface that is more resistant to wear and fatigue. In this paper we present results of tests performed with this process that was applied to workpieces with a convex surface of aluminium A92017. An experiment to do tests was designed. Measurement results of surface hardness and residual stress are presented in this paper as well. These results are compared to those measured in the workpieces before being burnished. Finally conclusions are drawn about the improvement of these properties applied to workpieces through the ball burnishing process. The main innovation of this paper is that we work on convex geometries. We also obtain a table of recommended parameter values for the process.

  • Grup de desenvolupament en fabricació i materials (DEFAM): Integración de procesos en fabricación

     Travieso Rodríguez, José Antonio; Llumà Fuentes, Jordi; González Rojas, Hernán Alberto; Sanchez Egea, Antonio Jose; Gómez Gras, Giovanni; Napoles Alberro, Amelia Emelina; Jorba Peiró, Jordi; Solà Saracibar, Joan; Hameed, S.; Romanillos Delgado, Daniel; Calles, S.
    Jornades de Recerca EUETIB
    Presentation's date: 2012-12-04
    Presentation of work at congresses

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    Comparativa del proceso de bruñido con bola en máquinas de 3 y 5 ejes en piezas de aluminio A92017 y A 96351  Open access

     Travieso Rodríguez, José Antonio; Napoles Alberro, Amelia Emelina; Sanchez Egea, Antonio Jose; Huertas Talón, José Luis; Gómez Gras, Giovanni; González Rojas, Hernán Alberto
    Congreso Nacional de Ingeniería Mecánica
    p. 84-
    Presentation's date: 2012-11-16
    Presentation of work at congresses

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    Caracterización de la placa de una herramienta de bruñido con bola asistida por una vibración ultrasónica  Open access

     Gómez Gras, Giovanni; González Rojas, Hernán Alberto; Travieso Rodríguez, José Antonio; Napoles Alberro, Amelia Emelina; Sanchez Egea, Antonio Jose
    Congreso Nacional de Ingeniería Mecánica
    p. 158-
    Presentation's date: 2012-11-14
    Presentation of work at congresses

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    En la industrial actual existen una gran cantidad de componentes mecánicos de máquinas-herramienta, automóviles, aviones, trenes, barcos, moldes, matrices de conformación, y muchas otras piezas; que deben tener una buena rugosidad superficial, una tolerancia geométrica concreta, un grado de dureza superficial elevado y unos valores de resistencia mecánica considerables para poder hacer frente a sus prestaciones. En los últimos años ha crecido notoriamente la cantidad de investigación asociada a los diferentes procesos que sean capaces de dejar en estas piezas, las características adecuadas para que puedan cumplir dichas prestaciones. A día de hoy se cuenta con un proceso capaz de solventar con éxito todas estas necesidades: el bruñido con bola, aunque éste también presenta sus limitaciones en cuanto a qué materiales se pueden bruñir, y cómo varía las propiedades de éstos. El presente trabajo aborda la caracterización de la placa vibrante de una herramienta de bruñido asistida por una vibración de alta frecuencia. Se espera que dicha vibración contribuya a hacer más fácil el desarrollo de este proceso de acabado, puesto que la misma debería ayudar a deformar con mayor facilidad el material de la pieza que se trabaja. Al final se obtienen las dimensiones óptimas para la placa de la herramienta, así como el modelo matemático que caracteriza su funcionamiento.

  • Influencia de la altura de cresta del mecanizado previo sobre la rugosidad obtenida con el bruñido

     González Rojas, Hernán Alberto; Travieso Rodríguez, José Antonio; Napoles Alberro, Amelia Emelina; Gómez Gras, Giovanni; Sanchez Egea, Antonio Jose
    Congreso Nacional de Ingeniería Mecánica
    p. 85-
    Presentation's date: 2012-11-14
    Presentation of work at congresses

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    Influencia del proceso de bruñido con bola sobre la dureza y las tensiones residuales en el aluminio A92017  Open access

     Travieso Rodríguez, José Antonio; González Rojas, Hernán Alberto; Gómez Gras, Giovanni; Napoles Alberro, Amelia Emelina; Sanchez Egea, Antonio Jose
    International Conference on Advanced Mechatronics, Design, and Manufacturing Technology
    p. 1-2
    Presentation's date: 2012-09-05
    Presentation of work at congresses

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    El bruñido con bola se realiza, para mejorar el acabado de las piezas que han sido mecanizadas y para obtener una superficie más dura con tensiones residuales a compresión. De este modo se obtendrá una mayor resistencia al desgaste y a la fatiga. En este trabajo se presentan los resultados de las pruebas realizadas con dicho proceso aplicado a piezas convexas de aluminio A92017. Se presentan como resultados, las mediciones de dureza y de tensiones residuales obtenidas antes y después del bruñido y se extraen conclusiones sobre la mejora de estas propiedades en las superficies bruñidas.

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    Influence of peak height prior to milling the resulting surface roughness of the ball burnishing process on convex and concave pieces of aluminum  Open access

     Gómez Gras, Giovanni; Travieso Rodríguez, José Antonio; González Rojas, Hernán Alberto; Napoles Alberro, Amelia Emelina
    International Conference on Surface Metrology
    p. 26-34
    Presentation's date: 2012-03-22
    Presentation of work at congresses

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    The ball burnishing process in question is performed after a machining operation, and the results have influence on it. An important parameter to control is the height of the ridge that remains after the machining, because burnishing process will be able to reduce it in a certain percentage. This study is aimed to conduct an analysis of the influence of peak height prior to milling the resulting surface roughness of the ball burnishing process with concave and convex parts of two different types of aluminum (A92017 & A96351). The milling is done with a ball mill of ¿8mm, rotating at a cutting speed of 3000min-1, with a cutting depth of 1 mm and three values of progress for three different conditions that leave a ridge height: 0.02 mm, 0.06 mm and 0.10 mm. The main contribution of this study is the recommendations on strategies for burnish these pieces, and measuring the roughness.

    Molds, counterfoils of conformation, and many other industrial pieces with important presentations, face constant the engineers with the problem of obtaining superficial qualities that minimize the friction, optimize the adjustments, or improve the superficial hardness. Among the many procedures to improve surface finish, highlights the ball burnishing, which have been obtained roughness values recommended in diverse applications. The ball burnishing process is a technological operation which is plastically deformed surface irregularities to improve the surface finish, by the action of the force exerted by a cylinder or ball. This process can be used on cylindrical surfaces, flat front, so, conical, with changes in section and radios, etc., which have been previously machined. The ball burnishing process in question is performed after a machining operation, and the results have influence on it. An important parameter to control is the height of the ridge that remains after the machining, because burnishing process will be able to reduce it in a certain percentage. This study is aimed to conduct an analysis of the influence of peak height prior to milling the resulting surface roughness of the ball burnishing process with concave and convex parts of two different types of aluminum (A92017 & A96351). The milling is done with a ball mill of ϕ8mm, rotating at a cutting speed of 3000min-1, with a cutting depth of 1 mm and three values of progress for three different conditions that leave a ridge height: 0.02 mm, 0.06 mm and 0.10 mm. The main contribution of this study is the recommendations on strategies for burnish these pieces, and measuring the roughness.The work is based on experimental data where through DOE techniques are carried out different experiments in which the surface roughness is measured in directions parallel and perpendicular to the previous milling for various conditions. We compare the results and an analysis of how this affects the height of the ridge left by the previous machining on roughness values obtained. Finally, it has been concluded that the burnish process improvement between 33 and 71% surface roughness of the pieces.