Estudio del desgaste de la plaquita CNMG120408-PM4325 en función de los parámetros de mecanizado en torneado CNC

Abstract

The project aim is to determine the lifetime of a cutting tool (insert or insert) using the Taylor equation. For them the CNMG 120408-PM4325 insert was selected and the AISI 1018 steel as material, verifying its chemical composition and hardness. The machining was performed on a CNC Romi C420 lathe with use of refrigerant, assigning precise parameters of cutting speed (285, 320, 355 and 400 m/min), with a penetration of 2.5 mm and a feed of 0.25 mm/rev. After each machining pass, the wear of the main flank of the insert was measured with the aid of an optical microscope. 300 μm was set as the life criterion of the insert based on the recommendation of the ASME B94.55M standard. The graphs of the wear curves were made, taking the average value of wear registered in the area of the main flank of the insert as established by the norm, based on the life time on the one hand and on the other hand the life time and the cutting speed, the latter in double logarithmic scale. In conclusion, constants n = 0.243 and C = 701.085 m/min are determined from the Taylor equation for the lifetime of the insert, using the linear regression method established in the ASME B94.55M standard. The validation of this equation is executed for a cutting speed of 340 m/min, with satisfactory results.