Abstract
Trends of machining hardened steel are increasing in manufacturing industry due to its advantages in surface quality over grinding and other finishing process. One of the major benefits of hard turning is attaining better surface quality with high dimensional accuracy. However, large amount of heat generation during hard turning to affects the machining performance. The application of lubricants during the machining are used to control the temperature. The use of conventional cutting fluids have become more problematic in terms of health and environmental pollution. Minimization of cutting fluid will lead to cost-effectiveness in overall machining. Therefore, the aim of this research work is to investigate the role of minimum quantity lubrication (MQL) technique on surface quality in turning of hardened AISI 4340 steel with CBN tools. The cutting speed, feed rate, and nose radius and workpiece hardness are selected as process parameters during investigations. The mathematical model of surface roughness is developed using second order regression analysis. Analysis of Variance (ANOVA) results show that MQL helps in improving the surface quality as compared to dry and wet conditions in turning.
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