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Comparative Analysis of Sustainable Cooling Systems in Intermittent Turning of Magnesium Pieces
Eva María Rubio,María Villeta,Diego Carou,Adolfo Saá 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Cutting fluids have been widely used in machining processes because of their favourable lubrication and cooling properties. However,their high costs, the risk to worker’s health and environmental concerns have necessitated the development of alternative methods ofcooling and lubricating that eliminate or, reduce such drawbacks. In this study, a comparative analysis of two sustainable coolingsystems (dry machining and minimum quantity lubrication (MQL) system) in intermittent turning of UNS M11917 magnesium pieceswas performed. To analyse the influence of the cooling system on intermittent cutting, the surface roughness was selected as theresponse variable. In addition to the cooling system, other parameters such as the feed rate, spindle speed, tool type, interruption typeand measurement zone (defined by the length and the generatrix) were taken into account. A combined L4x32 experimental design withthree nested replications was carried out. The obtained data were analysed using the analysis of variance (ANOVA) method. Mainconclusions include the identification of the feed rate and interruption type as the most important sources of surface roughnessvariability. In addition, it is possible to affirm that, in general, increases in the coolant flow rate, within the range studied, lead toslightly poorer surface roughness results.
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Experimental Study of the Dry Facing of Magnesium Pieces Based on the Surface Roughness
Eva Maria Rubio,Jose Luis Valencia,Adolfo Jose Saa,Diego Carou 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
This paper shows an experimental study of dry face turning carried out on UNS M11917 magnesium pieces. The work is focused on repair and maintenance operations which are generally carried out under cutting conditions of low performance. The main goal is to determine if such type of operations can be reached successfully by dry machining, the most drastic and sustainable cooling technique that exists, and, if so, what factor or factors among the involved ones in the machining (spindle speed, feed rate and tool coating) and their possible interactions are more influential in the quality of surface finish. To achieve this objective, a sustainable methodology that combines Taguchi design of experiment (DOE) and the analysis of variance (ANOVA) method are considered. The main result is the establishment of a model for estimating the expected surface roughness,in terms of average roughness, Ra, that allows selecting the best combination of cutting conditions and type of tool to obtain pieces within a certain range of surface roughness. The principal conclusion is that the dry machining technique can be used in the face turning repair and maintenance operations of pieces of magnesium producing a very good quality of the surface roughness and reducing costs and environmental impact.
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