Browsing by Author "Ogedengbe, Temitayo S."
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Item Comparative Analysis of Machining Stainless Steel using Soluble and Vegetable oils as Cutting Fluids(International Journal of Engineering Materials and Manufacture, 2019-03-01) Ogedengbe, Temitayo S.; Awe, P.; Joseph, Ojotu I.In this study, the performance of groundnut oil as an alternate cutting fluid was compared with that of soluble oil during machining of stainless steel. The temperature at the cutting zone, surface roughness and the chip formation were monitored under the two cutting conditions (soluble oil and vegetable oil). The machining parameters used were cutting speed (75 – 135 rev/min), feed rate (0.01 – 0.05 mm3/mm) and depth of cut (0.01 – 0.08 mm). The experiment was designed using Taguchi orthogonal array of Minitab 18 which generated a 9 run machining parameter mix for the experimentation. The Physiochemical properties of the various fluids were also analyzed to determine the properties and constituent elements of the cutting fluids. The actual machining of the stainless steel bar was done using a Colchester mastiff lathe machine. Results show that feed rate and cutting speed had the most significant effect on surface roughness during machining of stainless steel both with groundnut oil and soluble oil. Soluble oil was a better coolant but poorer in lubrication as vegetable oil reduced surface roughness more when used. Surface roughness value improved from 9.21μm during machining with soluble oil to 3.84μm during machining with groundnut oil which represented a 58.3% improvement. Hence, vegetable oil is therefore recommended as good alternative cutting fluid to soluble oil during machining of stainless steel.Item Comparative Analysis of Selected Animal and Vegetable Oils Suitability in Machining of Plain Carbon Steels(International Journal of Engineering and Management Research, 2019-04-28) Alabi, Ismaila O.; Okediji, Adebunmi P.; Ogedengbe, Temitayo S.; Joseph, Ojotu I.; Olukokun, Tolulope O.Due to the alarming rate in public awareness on environmental issues, there has been growing demand for biodegradable materials which has opened an avenue for using vegetable and animal oils as alternatives to petroleumbased polymeric materials in the market, most especially in machining operations. Thus, research on biodegradable functional fluids has emerged as one of the top priorities in lubrication, due to their applicability in many diverse areas. In this quest, there is need to conduct machining trials to determine the suitability of these oils in metal cutting (turning) operations of plain carbon steels. This study investigate the effect of the selected cutting fluids on certain parameters like machine removal rate (MRR), machining time, tool wear and spindle power consumption, etc. under different machining combination in turning operations of plain carbon steels obtained from universal steel Ikeja, Nigeria, using 150 x 10 HSS cutting tool. The selected oils purchased from Ogunpa market in Ibadan, Nigeria, were sieved to remove any foreign particles or dirt. The solution; water, based-oil, and emulsifier (to allow thorough mixing of water and oil without separation), were mix at an elevated temperature of 550C in a proportion 4:1:3. Experimental results clearly showed that Conventional cutting fluid might be replaced with Non-conventional cutting fluids (vegetable and animal based) as they give better performance. With slight modifications and deliberate but careful alterations in some of the components of such oils, even better performing cutting fluids could be obtained.Item Design and Development of a Wear Testing Machine for Manufacturing Laboratories(FUOYE International Engineering Conference, 2018) Ogedengbe, Temitayo S.; Yussouff, Abiodun A.; Adanikin, AriyoWear of parts during manufacturing processes is inevitable but controllable. Therefore, the critical study of wear in engineering components is vital because failure of components due to wear has resulted in loss of a great deal of fortune. This study was therefore an attempt to design and fabricate a wear testing machine, evaluate the performance of the machine and compare data obtained with existing ones. Materials for the various parts were carefully selected based on desirable properties and availability. Design calculations were made for the main shaft, compression spring, belt, pulley and electric motor. The post fabrication test was carried out on the machine to evaluate the performance of the machine and results gotten reported.Item Effect of Annealing on Machinability of Grey Cast Iron(Journal of Engineering and Technology, 2019-07-01) Ogedengbe, Temitayo S.; Aladejana, Yezeed; Yussouff, Abiodun A.This study investigates the influence of process parameter on machined cast iron under varying material strength and cutting conditions. The three process parameters considered in this study are spindle speed, feed rate and depth of cut. The cast iron bars were annealed and machined under both wet and dry cutting conditions. The signal-to-noise (S/N) ratio was used to analyze results generated, identify optimal process parameters (factors) and analyze the effect of these parameters on tool-tip temperature. Taguchi design of Minitab 18 was employed to optimize and analyze results. Results shows that the spindle speed was the most significant factor affecting tool-tip temperature reduction, followed by feed rate, while the depth of cut has least role to play on tool-tip temperature. Depth of cut and spindle speed both significantly influenced increment in material removal rate. The annealed cast iron bar had a better surface integrity than the Unannealed sample bars. Conclusively, the preferred condition for machining grey cast iron bar was annealed and wet machining condition.Item Effect of Coolant Temperature on Machining Characteristics of High Carbon Steel(Covenant Journal of Engineering Technology, 2018-03-05) Ogedengbe, Temitayo S.; Abdulkareem, S.; Aweda, J.O.This paper reports on the effect of coolant temperature 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 machining performance. The experiments were performed using cooled and ambient temperatures by employing Taguchi L18 orthogonal array to design the experimental runs. The cutting speed, feed rate and depth of cut were the machining parameters used; while the tool-work piece interface temperature was monitored using a digital thermometer with k-type thermocouple wire. The selected control factors are material removal rate and surface roughness. 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 the optimal cutting conditions were determined. It was observed that surface finish improved by 65% with the use of the developed cooled system. The reduction in coolant temperature played a vital role in improving surface finish during machining high carbon steels.Item Ergonomics Investigation of Musculoskeletal Disorder Among the Workforce of Waste Management Industry in Nigeria(Transactions of the VŠB–Technical University of Ostrava, Safety Engineering Series, 2017-09-01) Musa, Adekunle I.; Yussouff, Abiodun A.; Raji, Nurudeen A.; Ogedengbe, Temitayo S.; Saheed, Rasheed O.The objective of this study is to undertake an Ergonomic Scrutiny of Desecrate Management Industry. Ten (10) employees of the parking and collection department of Kim Waste Management Authority (KWMA) were selected. Their activities were video and recorded while working and their different postures were analyzed using Rapid Entire Body Assessment (REBA) and Rapid Upper Limb Assessment (RULA). Result showed that 10 % were at medium risk; 40 % were at high risk and 50 % were at very high risk for the workers in KWMA. It as discovered that workers are subjected to Musculoskeletal Disorder (MSDs) as a result of the postures adopted during the work process.Item Sustainable Machining Processes through Optimization of Process Parameters(International Journal of Engineering Materials and Manufacture, 2019-03-01) Ogedengbe, Temitayo S.Machining processes are a vital part of manufacturing activities in major industries that contributes to the growth of the economy. They mostly require high amount of electrical energy to power the various support modules installed on machine tools. Carrying out machining activities with a view to reducing energy consumption will therefore result in a lowered cost of production for manufactured products. Previous studies on some energy-saving methods adopted by researchers and the limitations faced in the reduction of energy consumption have been discussed. In this work, the effect of process parameters in the conservation of energy during machining processes was experimented. Results shows that much energy could be saved by optimizing parameters before machining.