Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
A STUDY ABOUT THE EFFECTS OF EMULSIFIABLE OIL CONCENTRATION OVER THE ROUGHNESS IN AUTOMOTIVE ALUMINUM, Al-Si (10 ~ 12%), PARTS, AFTER MILLING USING A PCD TOOL
Submission Author:
Gustavo Henrique Nazareno Fernandes , MG
Co-Authors:
Gustavo Henrique Nazareno Fernandes, Mariana Gomes, PEDRO RODRIGUES LOPES, Adelti Assis Silva, Paulo Sergio Martins, Luis Henrique Andrade Maia, Ítalo Bruno dos Santos, Breno Siqueira
Presenter: Gustavo Henrique Nazareno Fernandes
doi://10.26678/ABCM.COBEM2017.COB17-0001
Abstract
Machining operations generally involve a wide range of variables. The usage of cutting fluids is one of them. They influence not only the produced parts quality, but also the machine and tools. The fluids help bearings lubrication and also avoid waste deposition between machine rolling parts, thus avoiding its premature wear. Other than that, it is also an important factor in relation to surface integrity of the produced piece. Each machining operation, due to its specificity, need to be treated carefully and requires a technical-economic analysis that not only justifies the use of fluids, as well as the best way to use them, because they can entail costs to manufacturing process and can even be harmful to final products quality. So, before proceeding to do operations, it is strong recommended to be made a study to assess the best way to use a cutting fluid and ensure that it is having a good performance. However, inside the industrial scenario, where it is difficult to have neither enough time and resources to do this study, technical managers often have to use cutting fluids in their conventional manner, usually that one specified by the supplier, but that is not always the most appropriated way for a particular operation. In order to make a critical study about the way to use a commercial cutting fluid in an industrial operation already established, it was evaluated how the level of emulsifiable semisynthetic oil concentration from mineral origin, varying between 4 and 8%, influences the final workpiece roughness. It was analyzed a total of fifty gearboxes made of aluminum alloy, Ai-Si (10 ~ 12%). It was measured the surface roughness behavior in relation to Arithmetic Average Deviation parameters - Ra and Maximum Height Profile - RZ . The parts were machined in a milling operation using PCD (Polycrystalline Diamond) cutter, ∅ = 80mm in a CNC machining - Computer Numeric Control. The results were shown in various Roughness X Concentration graphs, showing a different roughness behavior from that expected. Thus, new Roughness tests on well-established concentration levels (5,6,7 and 8%) in total of thirty pieces, were made again intending to confront this unexpected phenomenon.
Keywords
machining, Roughness, cutting fluid, Concentration, milling
