http://hdl.handle.net/10016/7390 Sat, 18 May 2013 06:43:53 GMT 2013-05-18T06:43:53Z http://hdl.handle.net/10016/15581 Title: Development of software for easy prediction of process parameters in air bending with local heating Author(s): Canteli Fernández, José Antonio; Cantero Guisández, José Luis; Miguélez, Henar Abstract: This paper presents a new software tool for sheet metal forming, based on an analytical model of the process. The advantages of this kind of tool, compared with numerical models based on finite element codes, are described. The analysis is focused on sheet metal bending at high temperature that is a promising method for metal forming, improving sheet formability and machines range of use. Sat, 31 Dec 2005 23:00:00 GMT http://hdl.handle.net/10016/15581 2005-12-31T23:00:00Z http://hdl.handle.net/10016/15536 Title: Estudio mediante SEM/EDS del taladro en seco de la aleación Ti-6Al-4V; Tool wear in the dry drilling of TÍ-6AI-4V: a SEM/EDS study Author(s): Cantero Guisández, José Luis; Sánchez-Sola, J.M.; Tardío, M.M.; Sebastián, M.A.; Carrilero, M.S.; Marcos, M.; Miguélez, Henar Abstract: En este artículo se estudia el proceso de taladrado sin fluido de corte, de la aleación Ti6A14V, comparando dos condiciones de mecanizado, con y sin enfriamiento de herramienta y material entre taladros. El objetivo de este trabajo es analizar la influencia en el desgaste de la herramienta y en la calidad del agujero, del diferente incremento de temperatura originado por trabajar en una u otra condición. Para ello, se realizará análisis SEM/EDS y microscopía óptica de la broca e inspección visual del material.; This paper is focused on dry drilling of Ti6Al4V. In absence of cutting fluid, high temperatures are reached. Two different cutting conditions are studied in order to analyse the influence of temperature. In first condition, tests with no pause between drilled holes were carried out. In second condition, tests were performed cooling the tool with air between consecutively holes. Tool wear was studied with optical microscope and SEM-EDS techniques. The quality of machined holes was estimated in terms of optical inspection. Significantly differences in tool wear evolution were observed between both cutting conditions analysed. Fri, 31 Dec 2004 23:00:00 GMT http://hdl.handle.net/10016/15536 2004-12-31T23:00:00Z http://hdl.handle.net/10016/15534 Title: Dry drilling of alloy Ti-6Al-4V Author(s): Cantero Guisández, José Luis; Tardío, M.M.; Canteli Fernández, José Antonio; Marcos, M.; Miguélez, Henar Abstract: This work is focused on the combined study of the evolution of tool wear, quality of machined holes and surface integrity of work-piece, in the dry drilling of alloy Ti–6Al–4V. Tool wear was studied with optical microscope and SEM–EDS techniques. The quality of machined holes was estimated in terms of geometrical accuracy and burr formation. Surface integrity involves the study of surface roughness, metallurgical alterations and microhardness tests. The end of tool life was reached because of catastrophic failure of the drill, but no significant progressive wear in cutting zone was observed previously. High hole quality was observed even near tool catastrophic failure, evaluated from the point of view of dimensions, surface roughness and burr height. However, microhardness measurements and SEM–EDS analysis of work-piece showed important microstructural changes related with a loss of mechanical properties. Depending on the application of the machined component, the state of the work-piece could be more restrictive than the tool wear, and the end of tool life should be established from the point of view of controlled damage in a work-piece. Wed, 31 Aug 2005 22:00:00 GMT http://hdl.handle.net/10016/15534 2005-08-31T22:00:00Z http://hdl.handle.net/10016/15528 Title: Experimental identification of a thermo-mechanical model for air bending Author(s): Canteli Fernández, José Antonio; Cantero Guisández, José Luis; Miguélez, Henar Abstract: Experimental validation of thermo-mechanical modelling of air bending at high temperature is presented in this paper. A non-conventional experimental set up is designed and fabricated. Heating device is based on lineal heating along bend length, so temperature distribution is generated in sheet metal, it is previously instrumented to measure temperature. Bending device is based on a commercial press brake instrumented to measure bending force and punch displacement. Bending angle is measured before and after unloading. Model errors, defined by differences between calculated and measured values, were small. Developed work has proved that high temperature bending is easy to implement in industry, and developed model is able to predict accurately process parameters. Thu, 17 Jul 2008 22:00:00 GMT http://hdl.handle.net/10016/15528 2008-07-17T22:00:00Z