Browsing by Author "Ogedengbe, T.S."
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Item Effect of coolant temperature on machining characteristics of high carbon steel(Covenant Journal of Engineering Technology, 2018) Ogedengbe, T.S.; Abdulkareem, S.; Aweda, J.O.This paper reports the effect of super-cooled coolant on machining of high carbon steels. The development of a cooling system to reduce the temperature of water-soluble coolant to 7-9oC from ambient temperature was employed in this work to improve the process performance. The experiments were performed using cooled and ambient temperatures by employing Taguchi L-18 orthogonal array to design the experimental runs. The cutting speed, feed rate and depth of cut were machining parameters used, while the tool-work piece interface temperature was monitored using digital thermometer with k-type thermocouple wire. The selected control factors are material removal rate (MRR) and surface roughness (SR). The experimental results were analyzed using Minitab 16. The main effects and percentage contributions of various parameters affecting surface roughness and material removal rate were discussed, and optimal cutting conditions were determined. It was observed that surface finish improved by 65% with the use of the developed super-cooled system. The reduction in coolant temperature played a vital role in improving surface finish during machining high carbon steels.Item Effect of coolant temperature on the surface finish during turning of Titanium Alloy Ti6A14V(International Journal of Engineering Materials and Manufacture, 2018) Ogedengbe, T.S.; Abdulkareem, S.; Aweda, J.O.High temperature generated and stresses induced as a result of turning of Ti6Al4V results in poor surface finish. The aim of this study was to investigate the effect of coolant temperature on the surface roughness of Ti6Al4V which is a core material used as an implant. A cooling system was developed to reduce the temperature of the coolant (soluble oil) from room temperature to 2oC. Ti6Al4V was turned in dry and cooled (at temperatures 5, 7, 9 and 11 conditions. The experiment was designed using central composite design of (Response surface methodology) Design Expert 11.0 to generate an array and optimize the machining parameters. The machining parameters used were cutting speed, feed rate, depth of cut and coolant temperature. Results analyses show that cutting speed and depth of cut had considerable effect on surface roughness of Ti6Al4V. Surface roughness reduced when coolant temperature was reduced. The results of this study shows that turning Ti6Al4V at a very low cutting temperature will ensure a better surface finish.