Sivatte, M.; Parra, X.; Buj, I.; Vivancos, J. Precision engineering - Journal of the American Society for Precision Engineering (ASPE) Vol. 43, p. 505-513 DOI: 10.1016/j.precisioneng.2015.09.004 Data de publicació: 2016-01-01 Article en revista
Buj, I.; Joan Vivancos-Calvet; Coba, M. Precision engineering - Journal of the American Society for Precision Engineering (ASPE) Vol. 38, num. 1, p. 100-108 DOI: 10.1016/j.precisioneng.2013.07.009 Data de publicació: 2014-01 Article en revista
In the present work influence of different parameters of the rough honing process on surface roughness and material removal rate were studied. Specifically, second order mathematical models are presented for mean average roughness Ra (µm), maximum peak-to-valley roughness Rt (µm) and material removal rate Qm (cm min-1), obtained by means of regression analysis. For doing this a central composite design was defined, with a full two-level five variables design of experiments, 5 centre points and 10 face-centred points. Steel cylinders were employed. Abrasive chosen was cubic boron nitride. Considered factors were grain size, density of abrasive, tangential speed of cylinders, linear speed of honing head and pressure of abrasive stones on internal surface of cylinders. From the models most influential factors on process quality as well as on productivity were determined. Within the range studied, roughness depends mainly on grain size, pressure and density of abrasive. Material removal rate depends on grain size and pressure, followed by tangential speed. Optimization by means of the desirability function technique allowed determining most appropriate conditions to minimize roughness (surface quality) and/or maximize material removal rate (productivity)
Buj, I.; Joan Vivancos-Calvet Precision engineering - Journal of the American Society for Precision Engineering (ASPE) Vol. 35, num. 2, p. 289-293 DOI: 10.1016/j.precisioneng.2010.11.004 Data de publicació: 2011-04 Article en revista
Herein are presented roughness results of honing of steel cylinders with cubic boron nitride (CBN) abrasive tools. Different honing parameters such as honing stone pressure against the workpiece, tangential speed of the honing head as well as grain size of the abrasive stone were varied in order to determine their influence on the surface roughness of cylinders. Four different strategies were implemented to measure and characterise roughness of inner surfaces of honed steel cylinders. The variability in results obtained with each strategy is compared. The first three strategies consist in measuring roughness at one, three or nine points, respectively, which are uniformly distributed over a circumference located at one of the cylinder ends. The fourth strategy is based on the third one: it entails measuring roughness at nine points, and then subsequently filtering results to eliminate any extreme roughness value lying outside the boundaries set by Chauvenet's criterion. At each point of measurement, roughness is measured in the direction of the cylinder generatrix. It was verified that the larger the number of measurement points, the lower the variability in roughness values obtained. Therefore, it is recommended to make at least nine measurements per cylinder and to filter values to avoid any non-representative, outlier value. The variability in these values was quantified firstly according to relative differences. Secondly, variability was quantified by means of the coefficient of variation which provides smaller values than the relative difference, although less intuitive and less direct.
Pérez, C.; Joan Vivancos-Calvet; Sebastián, M. Precision engineering - Journal of the American Society for Precision Engineering (ASPE) Vol. 25, num. 1, p. 1-12 Data de publicació: 2001-01 Article en revista