S19  Usinagem dos Materiais    Titulo: ANÁLISE DA VIDA DAS FERRAMENTAS NO TORNEAMENTO DE AÇOS ENDURECIDOS   Resumo : ABSTRACT. IT WAS VERIFIED THE POSSIBILITY OF OBTAINING THE TURNING QUALITY COMPATIBLE WITH THE GRINDING AND IT WAS ALSO ANALYSED CUTTING TOOL LIVES OF PCBN AND MIXED CERAMIC (AL2O3) IN THE TURNING OF HARDENED STEELS. IT WAS EMPLOYED A CNC CONVENTIONAL LATHE OF 22 KW OF POWER AND WITH SOME WEAR, DUE TO PREVIOUS UTILISATION. THE MACHINED MATERIALS WAS THE QUENCHED AND TEMPERED ABNT 52100 (AISI E 52100) STEEL, WITH AN AVERAGE HARDNESS OF 60 HRC. AS A TOOL LIFE CRITERION WAS EMPLOYED AN AVERAGE SURFACE ROUGHNESS EQUAL AND BELOW TO RA = 0,6 M (RA  0,6 M). DIMENSIONS AND THE AVERAGE SURFACE ROUGHNESS OF WORKPIECES WERE MEASURED AND WEAR FORMS AND CUTTING TOOLS LIFE WERE ANALYSED. THE OBTAINED RESULTS LED TO CONCLUDE THAT, IN SEVERAL CASES, ITS IS POSSIBLE TO REPLACE THE GRINDING PROCESS TO THE TURNING AND TO OBTAIN A LIFE QUITE LONG OF PCBN TOOLS AND MIXED CERAMICS, FOR AN INDUSTRIAL APPLICATION. KEYWORDS. HARD TURNING, MACHINING, CERAMIC TOOLS, CBN TOOLS.     Autores : DINIZ, ANSELMO EDUARDO MATSUMOTO, HIDEKASU 0     Trabalho Completo :   COBEM99 | Comissão  Organizadora | Palestras | Sessões Técnicas | Autor | Simpósios e Sessões Especiais | Revisores |  Título  dos  Trabalhos | Local