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    The Development and Applications of Powder Metallurgy Manufacturing Methods in Automotive Industry
    (Kırıkkale Üniversitesi, 2017) Erdem, Oğuz
    Over the past decade,automotive industry has developed considerably faster than other sectors indirection of consumers' demands. In order to provide worldwide emission standards,focusing on new technologies and enhancing fuel efficiency is emerged as a newtrend among automobile manufacturers. Producing more efficient, lighter andeco-friendly cars without compromising performance and comfort has been themain goal of automotive industry in recent years. The high technologyrequirements of passenger cars with internal combustion engines as well as inhybrid and electric cars have directed the companies in sector to investigatealternative production methods. When compared with conventional manufacturingprocesses, powder metallurgy (PM) production methods are increasingly preferredby automobile manufacturers as they allow both profitability and partproduction in some special applications. In this review paper, it is aimed togive information about the development and application of PM methods inautomotive sector.
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    The Effects of Machining Parameters on Circularity Tolerance in Plasma Arc Cutting Method
    (Institute of Electrical and Electronics Engineers Inc., 2023) Hirtisli, Şerafettin; Erdem, Oğuz
    The concept of circularity in the machine assembly industry is of great importance, especially in hole-shaft connections and bolt-nut couplings. In order to reduce the production costs and to ensure the real function of the produced circular part, the circularity tolerance must be determined precisely. In recent years, the PAC method has been generally preferred in cutting the stainless steel sheets because the non-traditional manufacturing processes such as laser beam cutting or water jet cutting are very costly. The investigation of the drilled holes circularity on the stainless steel sheets with the PAC method has been investigated in this study. For this purpose, holes with a diameter of 40 mm were drilled with PAC method at different cutting speeds (151, 214 and 217 mm/min) and different gas pressures (0.6, 0.7 and 0.8 MPa) on AISI 304 stainless steel sheets with 4 and 8 mm thickness. The diameters of the drilled holes were measured with the help of a profile projection device and a digital gauge, the average diameter values and average circularity tolerances were calculated. In the machining of both 4 mm and 8 mm sheets, the circularity tolerance values increase as the cutting speed increases at constant pressure values. Similarly, when the cutting speed is constant, the circularity tolerance value increases as the gas pressure value increases. © 2023 IEEE.
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    The Parameters and Application Areas of Solid Medium Cementation
    (Kırıkkale Üniversitesi, 2024) Canbuldu, Arif; Erdem, Oğuz
    The design and manufacturing of machine parts covers many aspects of engineering and science. In addition to static and dynamic design, which is the basis of mechanics, choosing appropriate materials and determining the appropriate surface treatment are criteria generally learned through experience or determined by standards. In today's industry, efforts are being made to obtain more durable and lower-cost steels by replacing more expensive alloy steels with lower-cost steels or by hardening the surfaces of low-carbon steels. Carburization, also known as carburization, is a thermochemical surface hardening process generally applied to low carbon steels. The cementation process basically aims to improve mechanical properties such as surface hardness and wear resistance by providing carbon diffusion from the carbon donor material to the steel surface. The cementation process can be carried out in solid, liquid or gaseous medium. In this study, detailed information is given about the processing physics of solid medium cementation, application areas, variable parameters, carbon donor materials in the method, cementation temperatures and times, activator types and ratios used in the process.