Estudo do desempenho de nanolubrificantes no torneamento do aço-ferramenta AISI D6 temperado e revenido
Emulsions based on mineral oil are widely used in machining processes because their appropriate lubri-cooling properties. Nevertheless, the use of these cutting fluids has been questioned because they can cause damage to the environment and the workers’ health. This issue has motivated the emergen...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/31669 |
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| Resumo: | Emulsions based on mineral oil are widely used in machining processes
because their appropriate lubri-cooling properties. Nevertheless, the use of these
cutting fluids has been questioned because they can cause damage to the environment and the workers’ health. This issue has motivated the emergence of regulating
laws to limit the use them. In this context, this work aimed at evaluating and comparting the performance of three different vegetable-based nanolubricants (epoxidized soybean oil) with the addition of three different nanoparticles (CuO, aC:H and
CuO + aC: H), applied to the hard turning of quenched and tempered AISI D6 tool
steel using MQL technique. Thus, turning tests at constant cutting parameters (vc =
100 m/min, ap = 0.3 mm and f = 0.1 mm/rot.) with solid PCBN cutting tools were
performed. For comparison, turning tests under wet machining (using an oil-based
emulsion) and assisted by a vegetable oil (without any nanoparticles) applied under
MQL were also performed. The workpiece surface average roughness (Ra), the tool
flank wear and wear mechanisms and the morphology of the chips were the output
parameters. The aC:H and the hybrid (CuO + aC:H) nanofluids provided longer cutting tool life and higher chip thickness ratio as compared to the dry machining, which
may indicate lower cutting forces during chip formation. However, the CuO
nanofluid did not provide major difference in relation to the other lubri-cooling conditions in this evaluation criterion. With regard to the average roughness, the wet
machining provided the lowest values, the MQL conditions gave lower values as
compared with the dry machining, but without significant difference between them. |
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