Contribution to the study of hardened steel turning / Uma contribuição ao estudo do processo de torneamento de aços endurecidos

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

The main goal of this work is to study the feasibility of turning hardened steels using a lathe with a conventional mechanical design (without hydrostatic bearings), aiming to replace grinding operations. For this purpose, two kinds of quenched and tempered 52100 steel workpieces were machined, with average hardness of 60 HRc, using PCBN (65% of CBN) and mixed ceramic ( Al IND 2 O IND. 3 + TiC) tools. Both the electrical current of the main motor and the acoustic emission were monitored, aiming to automatically establish the moment to replace the tool. After the result analyses, the following conclusions were drawn: a) it is possible to replace grinding operations by turning with a conventional mechanical design lathe, since the workpiece quality obtained was within IT5 and the surface roughness was below Ra = 0.6 mu m, with tool life long enough for this kind of applications; b) the tool life monitoring through acoustic emission and electrical current of the main motor did not show to be suitable to establish the moment to replace the tool; c) in general, mixed ceramic tool had longer average toollife than PCBN tool, but presented larger scatter

ASSUNTO(S)

machining turning ferramentas para cortar metais machinery metal-cutting tools tornearia maquinas - monitoração usinagem

ACESSO AO ARTIGO

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