MATHEMATICAL MODELLING OF SURFACE ROUGHNESS FOR EVALUATING THE EFFECTS OF CUTTING PARAMETERS IN DRILLING PROCESS

摘要

The optimization of surface integrity in drilling process using response surface method (RSM) is presented. This paper investigates the machining parameters affecting the roughness of surfaces produced in dry drilling process. Three parameters were selected for study: cutting speed, feed rate and drill diameter. In this study developed a model of surface roughness based on the response surface method, logarithmic linearized approach for determining the processing parameters in drilling process of steel EN 1.0038, using HSS coated TiN drill tools. The experiment has been designed and carried out on the basis of a three level factorial design. Obtained results are in good accordance with the experimentally obtained data, confirming the effectiveness of regression analysis in modeling of surface roughness in the dry drilling process. The established predictive model shows that the surface roughness increases with the increase of feed rate and depth of cut but decreases with cutting speed increase.