Analise do desgaste de ferramentas no fresamento com alta velocidade de aços endurecidos / Analysis of tool wear in high speed milling of hardened steels

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Usually, the die and moulds components, which are responsible for the part forms, have complex geometries and are made of high hardness materials, what cause difficulties for their machining. High Speed Milling has become an alternative for machining these components. This work aims to broaden the performance understanding and the wear mechanisms on tools used in High Speed Milling of hardened steels for dies and moulds. In semi-finishing operation, it was analyzed the use of cemented carbide and cermet tools in different cutting conditions in milling of ABNT H13 steel with 50 HRC of hardness. In finishing operation, it was analysed the use of ball nose solid tools of cemented carbide and indexable inserts assembled on steel and cemented carbide toolholder in milling of ABNT D2 steel with 61 HRC of hardness. The main results in semi-finishing operation showed that the use of coated cemented carbide tool exhibited longer life, the machined surface inclination has a strong influence on tool life, and the tool wear involves different mechanisms: in the beginning of tool life, mainly abrasion and diffusion and/or attrition, and in end of tool life, adhesions and micro chipping. In finishing operation, the results showed that the use of cemented carbide toolholder causes longer tool life than the use of steel toolholder. However, tool life using cemented carbide toolholder is shorter than the using solid tools of cemented carbide. The tool wear in finishing operation was characterized by adhesions of part material and by microchipping

ASSUNTO(S)

desgaste mecanico ceramica tool wear usinagem cemented carbine machining aço-ferramenta tool-steel metalurgia do po cerment

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