Influence of the CO 2 laser cutting process parameters on the Quadratic Mean Roughness Rq of the low carbon steel

摘要

High power CO2laser cutting of 6 mm thick of the low carbon steel sheets (S235) is investigated with the aim of evaluating the effect of the various laser cutting parameters such as laser power and cutting speed, on the laser cutting quality. In this study, cutting quality was evaluated by measuring the Quadratic mean roughnessRqof the machined surface.A simple and practical model was proposed to predict the Quadratic mean roughnessRqas a function of namely parameters; laser powerP, cutting speedVand fixed assistance oxygen flow rateQ. The adequacy of the proposed model was tested by Analysis Of Variance (ANOVA). The Experimental data were compared with modeling data to verify the capability of the proposed model. The results indicate that laser power and cutting speed are determinant cutting-parameters on the quadratic mean roughness of the cutting surface. The surface roughness parameter is determined from ANOVA statistical analysis by providing simple analytical model.