Evaluación de los parámetros de mecanizado en el proceso de taladrado en el centro de mecanizado CNC Bajo diferentes condiciones de lubricación : mecanizado sin lubricación.

Abstract

For the present titration work, 18 specimens were machined by drilling (2 repetitions of 9 specimens each), combining cutting parameters such as spindle speed and feed rate, to evaluate these parameters by measuring the roughness of the internal surface, measuring the machining time and measuring diameters, as well as estimating the relative error between the final diameter measurement and the expected one. In this work, AISI 4140 steel shafts with previously machined geometry and an IZAR HSSCo 5% cobalt high speed steel drill bit were used as specimens, as well as a BT30-ER40-70 collet to hold the drill bit during the machining process; In addition, a Mitutoyo roughness meter and an Insizer calibrator were used to take the roughness data, which were taken at 4 different points, and the diameter measurements at 3 different points in order to analyze the existing measurements and errors in the measurements. After obtaining the data, tables were drawn up to generalize the parameters with which the best conditions were obtained in the specimens, whether in terms of dimensional tolerances or surface finishes. From which we have that the cutting speed of 534.76 [RPM] and advance of 64.17 [mm/min] corresponding to the VAAA1 specimen are the parameters with the best surface finish, while the cutting speed of 458.37 [RPM ] and feed speed of 55 [mm/min] corresponding to the VMAA2 specimen are the parameters that obtained the worst surface finishes.