Turning hardened steel using coated carbide at high cutting speeds

Abstract

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

Experimental investigation of surface roughness, flank wear, chip morphology and cost estimation during machining of hardened AISI 4340 steel with coated carbide insert

“…In another study, acknowledged by Dureja et al (2010) showed surface roughness significantly revamps using machining parameters such as feed, workpiece hardness and cutting speed while flank wear is realized under the effect of cutting speed and feed which are found the most significant during finish turning of hardened AISI H11 steel with CBN tools. Aneiro et al (2008) investigated the influence of cutting parameters on tool wear, cutting forces, and surface roughness during turning of hardened steel using coated carbide and PCBN tools, respectively. The results concluded that machining of medium hardened steels was productive with coated carbide tools.…”

Análise Da Força De Usinagem E Da Rugosidade No Torneamento Do Aço Aisi 4340 Endurecido Com Ferramentas De PCBN E De Metal-Duro

“…Nas operações de torneamento de materiais endurecidos são empregadas ferramentas de PCBN, cerâmicas, e metal-duro [6,31]. Tais ferramentas necessitam de extrema dureza, elevada resistência à compressão, alta resistência a quente e elevada resistência interna de ligação para suportar as severas condições de usinagem [32].…”

“…Já na operação de torneamento desse aço com a ferramenta de PCBN não ocorreram mudanças consideráveis, tanto nas componentes da força de usinagem quanto na qualidade da superfície. Esta situação evidencia e consolida a aplicação dessa ferramenta no torneamento do aço AISI D2 e dos aços endurecidos [31,32]. Além disso, mostra que os aços AISI 52100 e AISI D2 com 55 HRC de dureza estão nitidamente em uma área de aplicação da ferramenta de PCBN, em função dos resultados apresentados.…”

On the application of response surface methodology for predicting and optimizing surface roughness and cutting forces in hard turning by PVD coated insert

“…In addition, machining cost analysis was also performed in economic conditions to compare CBN-TiN-coated and PCBN inserts. Aneiro et al (2008) have studied the turning of hardened steel using TiCN/Al2O3/TiN coated carbide tool and PCBN tools during turning of hardened steel. They observed that high tool life could be achieved using PCBN tool, but their cost is twice the coated carbide one.…”