Torneamento do aço-ferramenta AISI D6 temperado e revenido nas condições seco, jorro e LN2: uma análise técnico-econômica
A lot of attention has been paid about the environmental impacts caused by the machining industry. The use of conventional cutting fluids based on mineral oils, for example, has been approached as a practice to be overcome or, at least, minimized. However, the solution for this question comes up...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27986 |
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| Resumo: | A lot of attention has been paid about the environmental impacts caused
by the machining industry. The use of conventional cutting fluids based on mineral
oils, for example, has been approached as a practice to be overcome or, at least,
minimized. However, the solution for this question comes up against technical
aspects, mainly in the case of machining of difficult-to-cut materials. In this sense,
the effectiveness of technical practices that appear as environmentally sustainable,
as the case of cryogenic machining with liquid nitrogen (LN2), have been
investigated. Several investigations have shown that the machining assisted by LN2
present a lot of technical advantages and besides to be considered a sustainable
cutting fluid. Nevertheless, the use of LN2 as cutting fluid in the industry is considered
irrelevant. In this sense, the present work was intended to investigate the technical
and economic feasibility of using liquid nitrogen as cutting fluid in machining of
quenched and tempered AISI D6 tool steel with PCBN inserts. In this case, three
flows of LN2 were investigated. For comparison purposes, turning trials under dry
and wet conditions were also performed. As output variables cutting tool wear and
chip morphology were monitored. The technical and economic analyses were
performed based on the cost/hour related with the consumption of cutting tool,
cutting fluid, electric energy and cutting fluid disposal. It was concluded that the dry
machining was more feasible as compared to the other conditions. However, it
should be noticed that cryogenic machining with LN2 can be justified because of its
technical benefits to the machined component. |
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