Otimização do processo de usinagem de titânio com laser pulsado de neodímio / I. A. ALMEIDA. Optimization of Titanium Machining by Pulsed Nd:Yag Laser. 2007. Thesis (Doctoral) - Tecnologia Nuclear Materiais - IPEN, Universidade de São Paulo, São Paulo, 2007.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The main goal of this work was to establish the requirements for laser processed parts to satisfy uniform surface finish, low roughness and preservation of the mechanical and functional properties of the parts. Lasers became a versatile machining tool that satisfies the modern trends in material processing. In this study, the cutting quality factors of sheets of pure titanium and its alloys, by pulsed Nd:Yag laser, were investigated according to the Design and Analysis of Experiments. Laser pulse energy, laser pulse length, pressure of the protective/reactive gas, cutting speed, were considered the key laser parameter processing factors. In this Design, a factorial arrangement, regarding several combinations of these different processing factors, was performed and the influence of each one was also taken into consideration. The cutting process was performed on commercially pure titanium (grade 2) and the alloy Ti-6Al-4V (grade 5) sheets. The obtained samples were analyzed through optical microscopy in order to determine the edge roughness formations. The samples were also analyzed by scanning electron microscopy and submitted to micro hardness tests and surface roughness inspections. An increase on the surface hardness on the cut region and the formation of nitrogen precipitates under a thin layer of a melted zone were verified. In spite of the complexity of the interactions between this diversity of parameters, it is possible to optimize the titanium laser cutting.

ASSUNTO(S)

doe projeto de experimentos. titanio laser pulsado nd:yag titanio laer pulsado nd:yag doe projeto de experimentos.

ACESSO AO ARTIGO

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