The present work studies some aspects of the turning process applied on hardened steel using multilayer coated carbide tools at high cutting speeds. The influence of cutting parameters (vc, f, and depth of cut - d.o.c.) on tool temperature, tool wear, cutting forces, and surface roughness were analyzed. The current literature reports many studies using PcBN on hardened steel, but it is also important to know the results when using coated carbide tools, mainly for economical reasons. Temperature was measured by a thermocouple positioned at the lowest insert face, underneath it. Temperature near the rake face was calculated using the measured gradient within the insert thickness. To measure the gradient a special technique was used with one embedded thermocouple near the rake face and one underneath. Tool wear measurements demonstrated the capability of such tools in turning hardened steel with reasonable tool life. Forces measured resulted in relatively low values, being the radial component the largest of all. For the different cutting conditions studied, the doc has the greatest influence on force and temperature. Additionally, the best surface roughness values were smaller than 0,4 µm Ra
The demand for mechanical components of high quality and great accuracy for high precision systems is increasing considerably
Dado que la evaluación física de los recubrimientos no brinda suficiente información sobre el comportamiento durante el maquinado de insertos recubiertos, en el presente trabajo se han estudiado insertos de carburo de tungsteno (WC) recubiertos con multinanocapas de [TiN/TiAlN]n (200 y 300 capas) con un espesor de 4 µm utilizando la técnica Deposición Física reactiva en fase Vapor (PVD) y comparándolas con insertos recubiertos tipo monocapa de TiCN-Al2O3-TiN (TINAL) producidas de forma industrial. Mediante esta técnica las capas depositadas están en el orden de los nanómetros.Se realizaron ensayos de temperatura mediciones de rugosidad superficial en la pieza, huella de contacto y se mostraron resultados de desgaste. Los ensayos se realizaron sobre probetas de acero AISI 4340 endurecido 50HRc aplicando altas velocidades de corte (HSC).Los valores de temperatura fueron inferiores, así para los insertos de 300 capas la disminución fue de 520 °C y para las de 200 capas de 770°C.Los resultados de los ensayos de desgaste demostraron, que los insertos recubiertos con 200 y 300 capas alcanzaron valores de vida útil mayores en un 44% y 57 % respectivamente, comparados con el valor obtenido (7600m) por el inserto de TINAL.
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