DEPARTMENT OF INDUSTRIAL AND PRODUCTION ENGINEERING
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Item Mixture Experiments and their applications in welding flux design(Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM, 2008) Adeyeye, D. A.; Oyawale, F. A.The traditional welding flux development has been by cost, material, time and labour intensive experiments. The extensive and expensive trial and error experimentation is needed because it is often difficult to know a priori how the flux ingredients interact to determine the operational characteristics of the flux and the final performance of the welded structure. The limitation of the traditional approach includes: (1) long lead-time (2) expensive experiments in terms of materials and energy consumption and labour requirements (3) the flux developed can not be guaranteed to be optimal and (4) inability to identify and quantify direct and interaction effects of flux ingredients. These constraints are due to the paucity of statistical modelling tools in welding flux technology. Since prediction models are derived from designed experiments, flux researchers need other methods by which flux experiments may be designed. This paper discusses a statistical modelling tool known as mixture experiment which has the potential to revolutionize welding flux development technology. Mixture design is discussed but not fully developed. The procedure of mixture experiment, analytical model forms and the sequence of model fitting are discussed. Areas of welding flux research where the various mixture designs may be useful are suggested.Item Manpower planning using decision analysis: case of crown company(Akamai University, Hilo, Hawaii, 2008) Oyawale, F. A.; Adegboyega, O. A.This study addresses the analytic approach to decision making and its application to manpower planning in the crown section of a bottling company in Nigeria. The company produces crowns for several bottling companies and was faced with the challenge of meeting customer's demand, which varied from month to month. A work sampling technique was used to investigate the discrepancy between the level of the work force and their output. The result of the work sampling study showed that all of the departments were overstaffed with idle time and that overtime, rather than additional shifts, would reduce manpower cost. The results have been applied to the management policies that can be employed to meet increasing short term demand.Item Local sourcing of raw materials for the manufacturing of manual metal arc welding electrodes: a case for locally produced steel wire in Nigeria(Dincan Science Company, 2008) Oyawale, F. A.Since early 1995 when pressure was mounted on the Raw Materials Research and Development Council in Nigeria, with a view to sourcing wire, flux and binder locally, little or no success has been recorded. As at 1998, all the raw materials including core wire for electrode manufacture in Nigeria were still being imported. The aim of this project is therefore to explore the possibility of using locally sourced wire in electrode production. In this research, wire drawn at the Oshogbo rolling company in South Western Nigeria from billets produced at Delta Steel Company Aladja in Delta state, Nigeria was used with commercial flux in a production run by a local electrode manufacturing outfit. Mechanical tests and microstructure show that the quality of electrodes produced compared favourobly with E6010 standards.Item Investigation of the grain structure of the fusion zone of single pass arc welding of structural steel (NST 34 L-C)(Akamai University, Hilo, Hawaii, 2008-06) Oyawale, F. A.; Sanusi, K. O.Some welded structures show poor mechanical properties at the weld and the adjacent zones. This has led to the collapse of structures when subjected to various torques. This research investigates the grain structure of the fusion zone of a single pass arc welding of structural steel to identify the mode of growth and grain transition of the zone and adjacent weld. Two parameters -temperature gradient in the direction of solidification and rate of advance of solidification were studied vis-a-vis welding speed, arc current and plate thickness. The results showed that chances in the welding variables affected the mechanical properties of the welded structure.Item Development of FeO, TiO2-SiO2-CaCO3 system as a welding flux(2004) Oyawale, F. A.; Ibhadode, A. O. A.Using local raw materials, various metal-arc welding fluxes were formulated. A ternary system of FeO, TiO2- SiO2-CaCO3 gave satisfactory results. Average values of 546 N/mm2 ultimate tensile strength and 10% elongation were obtained from all-weld metal tensile specimen. The formulation also gave a metal deposition efficiency of 88.9%Item Design and prototype development of a mini-electric arc furnace(Akamai University, Hilo, Hawaii, 2007-05) Oyawale, F. A.; Olawale, D. O.Electric arc furnaces (EAF) have the capabilities required for furnaces used for metallurgical research. An electric arc furnace was designed and constructed to melt approximately 5kg of steel/cast iron scraps, using locally produced Soderberg electrodes. Tests carried out showed that it required about 60 minutes to heat up the furnace to the melting temperature of cast Iron (1150C - 1400C). It took about 95 minutes to melt the first charge of 2kg resulting in a melting rate of 21.05g/minute. The average electrode consumption rate was 0.0467cm/minute. A transformer efficiency of about 83% was also achieved.Item Design and manufacture of manual electrode coating machine for small-scale arc welding electrode manufacture(2005) Oyawale, F. A.; Ibhadode, A. O. A.Local production of electrodes in Nigeria has always been by major manufacturers. The technical partners have maintained that there are no suitable substitutes for the raw materials locally in an attempt to continue to import from their home countries. Our effort at local sourcing required experimentation, which could not be carried out without a means of applying the coating to the wire. This was effected through a direct extruder, which was fabricated to coat electrodes under manual pressure built up through a plunger in an extrusion chamber. Once a wire was coated, the plunger was withdrawn to remove the pressure. The electrode-coating machine is expected to find application in research laboratories of tertiary institutions and small scale manufacturing outfits.Item Design and production of a mechanized coating machine for welding electrode(2005) Oyawale, F. A.; Akinyemi, O. O.This paper presents the design and local manufacture of mechanized extruder for electrode coating. The extruder uses a worm screw injector for propelling the flux paste through the extruder die area. The worm screw injector is driven by a separate electric motor unit. A hopper which is able to hold a large quantity of flux paste at a time feeds this worm screw injector and consists of a feed wire mechanism coupled to the extruder block assembly. This wire feed mechanism is responsible for driving the inlet roller and consequently feeding the extruder die block with straightened bare wire. The extruder is suitable for small scale electrode manufacture.Item Design, construction and performance evaluation of the absorption type refrigerator(2004) Oyawale, F. A.; Popoola, O. T.The absorption refrigerating mechanism is based on Dalton Law of partial pressure. The refrigerant is ammonia with hydrogen as the propellant. The unit comprises a generator, condenser, evaporator and absorber. Ammonia is driven out of the water in the boiler when heat is applied. In the condenser, it is liquefied and evaporates at low pressure in the evaporator. As the ammonia boils, it absorbs heat. The refrigerator is built entirely with locally available materials and functions on a kerosene burner. It is a viable alternative to the conventional compressor-type refrigerator and in addition avoids the hazards associated with the conventional refrigerants.Item A neuro-fuzzy linguistic approach in optimizing the flow rate of a plastic extruder process(Centre of Professional Research Publications, 2006) Oke, S.A.; Johnson, A. O.; Charles-Owaba, O. E.; Oyawale, F. A.; Popoola, I. O.The plastic extruder system is an important process in the solid waste recycling system. This paper optimizes the flow rate of this process with the application of a neuro-fuzzy model. The model identifies a specified desired output from a large number of input parameter. The methodology adopted is neuro-fuzzy. The concept of neuro-fuzzy is not new as a research methodology but new in its applied form to plastic recycling extruder process. The result obtained indicates the feasibility of applying the methodology in this instance. Thus, the study may be extended to other recycling processes apart from plastic base. The study is predicated on the need to attain more precision in the derivation of optimal values for the plastic extruder system in recycling plant. The research has strong economic implications since it has theory with an applied bias on a problem experienced by the industry. It can be used by managers in the plastic industry, or practitioner i.e. those supporting practice such as consultants or software developers, to mention a few. The work particularly has an economic justification. Intrinsically, the result obtained being an improvement over what was reported by earlier researchers is noteworthy. The paper is new in that it appears to be the first application of neuro-fuzzy in the system being researched.
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