Internal turning for cylinder liners made of centrifuged gray cast iron / Torneamento interno de cilindros automotivos de ferro fundido cinzento centrifugado

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This investigation describes and shows an unprecedented machining process to be used for manufacturing cylinder liners, which are very important parts used in aluminum engine blocks for automobiles. There are few known companies that manufacture this kind of component, and until now, all of them use a boring process to machine the internal diameter of the cylinder liner. Among other advantages, this investigation intends to increase significantly productivity, while respecting all technical specifications of the product. The boring process was replaced by internal turning, which uses a turning center with load/unload system, special cutting tools and clamp devices, as well as audacious machining strategies. The cylinder liners are made from centrifuged gray cast iron, an extreme abrasive material that needs special care during its machining process. After the complete development of the process and tryouts to define the preliminary data, it has been used an objective methodology to optimize the proposed process, developed on the shop floor, considering all the variables found in real production conditions. The investigation results shown the carbide inserts had better performance than the silicon nitride and aluminum oxide ceramic inserts in this studied application, evidencing the best cutting conditions to internal turning for cylinder liners made of centrifuged gray cast iron.

ASSUNTO(S)

ferro fundido centrifugado boring tornos - controle numérico centrifugally gray cast iron internal turning automoveis - motores - cilindros cylinder liners

ACESSO AO ARTIGO

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