Abstract
EN-31 is one of the difficult-to-cut steels that has applications in the manufacturing of die-casting moulds, high-strength bearing, and several heavy automobile parts. Generation of heat while cutting such material is the principal cause of tool wear and diminishing surface qualities of a machined part. The application of lubricant lowers the temperature of machining but the excess use of lubricant is responsible for increasing the overall cost of machining. Also, due to health and environmental concerns related to lubricant exposure, the application of the Minimum Quantity Lubrication (MQL) technique as an alternative to flood cooling is increased in recent times. In this work, an attempt is made to increase the effectiveness of the MQL technique by optimizing the parameters associated with it. The face milling experimentation on EN-31 steel is accomplished by arranging MQL parameters using Taguchi’s method-based L18 orthogonal array. CRITIC approach is exploited to determine the correlation between the tool flank wear and cutting temperature. The optimum parameter setting for tool flank wear is discovered as 150 ml/h lubricant flow rate, 40 mm spraying distance, 60 % lubricant concentration, and 45° nozzle elevation angle. A reduction of 2.10 % in the value of the flank wear is achieved at the optimal MQL parametric settings.
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