Person: ATAKÖK, GÜRCAN
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ATAKÖK
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GÜRCAN
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Publication Open Access Management of the engineering data for manufacturing(2021-09-01) ATAKÖK, GÜRCAN; Atakok G., Cun M.Most companies have adopted the use of computer integrated engineering software to cope with the increasing competition and pressure to produce better quality and at a faster rate, enhancing their systems on this basis. Models are designed on computers, designs are validated in the software, and tool paths for manufacturing are generated in different specific software. All engineering information is generated and stored in computers. This development enhances faster rate of works in companies; however, some problems such as the management of the data arise. All departments in a business work separately, but for the same purpose. It is required for each department to have access to related information. The existence of a system in which the information is checked and managed depending on their creation time, versions, and the department is of importance. In this article, a system that allows not only the mechanical design department, but also the manufacturing, storage, process planning, quality control, electrical design, purchasing departments, etc. to have access to the required information has been developed. In the absence of this kind of system, loss of time, scraps and loss of engineering time would be investigated. After starting up the system, its benefits are defined. Tracing the workflows for management purposes would be handled by the system. A 'Validation of Design' process is modelled for the company. The information can be accessible to only those responsible for the data, and not anyone else. This allows users to work in a better environment, hence, increases productivity.Publication Open Access Tensile, three-point bending and impact strength of 3D printed parts using PLA and recycled PLA filaments: A statistical investigation(2022-05-01) ATAKÖK, GÜRCAN; Atakok G., Kam M., Koc H. B.In this study, the Taguchi methodology was used to investigate the effects of Fused Deposition Modeling (FDM) production parameters tensile strength, three-point bending strength, and impact strength of three-dimensional (3D) printed polylactic acid (PLA) and recycled polylactic acid (Re-PLA) test parts. As FDM process parameters, filaments (PLA, RePLA), three different layer thicknesses (0.15-0.20-0.25 mm), occupancy rates (30%, 50% and 70%), and filling structure (Rectilinear) were determined in the experimental design. The FDM technique was used to print the test parts. The tensile, three-point bending, and impact strength of the test parts were determined using the ISO 527, ISO 180, and ISO 178 test standards, respectively. The results showed that layer thickness is the most efficient factor for improving tensile strength, three point bending strength, and impact strength rather than occupancy rate or filament materials. The optimum results were obtained in layer thickness (0.25 mm), occupancy rate (70%), and filament material (PLA), respectively. They were calculated to be as 60.006 MPa at tensile strength, 125.423 MPa at three-point bending strength, 16.961 kJ/m2 at izod impact strength. Also, Scanning Electron Microscopy (SEM) has been utilized to investigate the morphology and topography alterations in the fractured surface of test parts. The study demonstrates the possibility of 3DP with RePLA filament and environmental awareness was noted by using recycled filament. The study demonstrates the possibility of 3DP with Re-PLA filament and environmental awareness was noted by using recycled filament. The research shows that 3D printing with Re-PLA is feasible. (c) 2022 The Authors. Published by Elsevier B.V.Publication Open Access CNC kumaş kesim makinesindeki krank-biyel mekanizmasının kinematik analizi ve kesici bağlantı uzunluklarının performansa etkisi(2022-01-01) ATAKÖK, GÜRCAN; Atakök G., Balci S.Krank - biyel mekanizmaları, kullanım alanı çok geniş olan bir hareket mekanizmasıdır ve basit, kullanışlı olması dolayısıyla çok katlı materyalleri kesme makinelerinde oldukça tercih edilmektedir. Bu mekanizmaya dayanan kesme sistemlerinde, kesme hızını arttıran parametrelerden biri olan krank uzunluğu değişiminin sisteme olan etkilerini görmek için Matlab / Simulink ile simülasyon gerçekleştirilmiştir. Ayrıca çok katlı serilmiş materyalleri kesmek için kullanılan kesme makinesinin kesici mekanizmasının kinematiği incelenmiş, hareketi analiz edilmiştir. Krank-biyel uzuvlarının optimum boyutları, karmaşık sayıların kullanılarak çıkarıldığı denklemlere göre belirlenmiştir. Çıkarılan boyutlar ve hareket denklemleri, Matlab / Simulink ile modellenerek karakteristik eğriler elde edilmiştir. Yapılan analizler sonucunda, çok katlı serilmiş materyalleri kesme makinesi için uygun krank - biyel kol uzunluğu bulunmuştur.Publication Open Access Cooling and Multiphase Analysis of Heated Environmentally Friendly R152A (C2H4F2) Fluid Coming from the Production Process According to Nist Indicators(2024-05-01) ATAKÖK, GÜRCAN; ERSOY, SEZGİN; Kartal M. A., ATAKÖK G., ERSOY S.Cooling processes are responsible for a significant portion (20%) of global energy consumption and raise environmental concerns such as ozone depletion, the greenhouse effect, and high energy use. This study investigates the potential of R152a, a refrigerant with low global warming potential (GWP), as a more sustainable alternative. The performance, safety, and operational efficiency of R152a were evaluated under various conditions. Although R152a offers high performance and low GWP, its flammability necessitates caution, especially in certain mixtures. A 12-pass tube-type heat exchanger model was simulated using computational fluid dynamics (CFD) to analyze the fluid behavior within the exchanger. The pressure, density, dynamic pressure, Prandtl number, total pressure, and temperature distributions for both R152a and H2O (water) were visualized using contour plots. The simulations comprehensively examined the fluid behavior inside and outside the heat exchanger. The results revealed the influence of the temperature on the internal dynamic pressure and density of R152a. Compared with R134a, R152a demonstrated superior performance but a lower coefficient of performance (COP) than R32. Studies also suggest that R152a exhibits lower irreversibility in Organic Rankine Cycle (ORC) systems than R245fa. These findings suggest that R152a holds promise for future refrigeration systems, as supported by existing research on its performance and compatibility. One study focused on optimizing the heat exchanger performance by maximizing the heat capacity and minimizing the pressure drop. This study employed a parallel-flow heat exchanger with R152a as the coolant for the hot process water. The temperature changes, pressure drops, and resulting energy efficiency and thermal performance of both fluids were analyzed. The results highlight the distinct energy efficiencies and thermal performance of the employed fluids.Publication Metadata only A review of mechanical and thermal properties of products printed with recycled filaments for use in 3d printers(2022-02-01) ATAKÖK, GÜRCAN; ATAKÖK G., KAM M., Koc H. B.Three-dimensional printers (3DP), which are often heard with additive manufacturing, are widely used in part production. Sensitive and custom-made products in different designs can be produced more easily and quickly, but waste specimen formed after the failed three-dimensional (3D) prints cause waste and environmental pollution from the expensive filament material. It is thought that such problems can be prevented by minimizing the waste when the scrap materials generated as a result of each production are recovered. This study investigated the benefits of recycling all possible waste filament specimens, including the supports removed from the part after the defective products or supported production, by granulating and reusing in the production of new parts in the next 3D production process. Mechanical differences between the 3D specimens produced with virgin filaments to be printed with recycled filaments are investigated and it has been determined that most of the countries cause environmental pollution due to the waste of materials including additive manufacturing and 3DP processes. The use of the filament material, which takes a long time to procure from abroad and is mainly procured externally, will be increased from one time to twice or thrice, thus facilitating the availability and preventing environmental pollution.