Yazar "Erdem, Mehmet" seçeneğine göre listele

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    Computational fluid dynamics simulation of erosion-corrosion in abrasive water jet machining
    (World Scientific Publ Co Pte Ltd, 2021) Ada, Hediye Deniz; Erdem, Mehmet; Gök, Kadir
    Today, conventional machining with chip or machining without chip machining manufacturing methods is used to bring to the desired dimensions sizes the machines and equipment used in the industry. However, non-traditional manufacturing methods are used in cases where traditional machining manufacturing methods are inadequate. Cutting with water jet which is one of the non-traditional manufacturing methods is commonly used in several fields of industry. Unlike traditional manufacturing methods such as turning and milling, not using of a physical cutting tool is among the advantages of the method. Abrasive water jet manufacturing method was started to be applied by adding abrasive particles in the water jet. Apart from the superior properties of the method, possible damages occur in the water jet nozzle due to processes such as cutting or drilling by applying high pressure. Erosion-corrosion is the leading damage among these damages. In this study, the erosion-corrosion in the nozzle caused by high-pressure water and abrasive during the abrasive water jet cutting process was simulated in the computer environment. In this paper, the erosion rate in the nozzle was calculated as 6,90E-06 kg/m(2) s. This value was converted as 0,30 mm (27,09 mm for yearly) via developed software for 100 h.
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    Development of a new model for determine of cutting parameters in metal drilling processes
    (Springer Heidelberg, 2020) Turkes, Erol; Erdem, Mehmet; Gök, Kadir; Gök, Arif
    Metal drilling and cutting processes are used commonly in many areas of the industry. When these processes investigated analytically, it is seen that they have a very complicated structure. This complicated structure can find easy solutions with finite element-based simulation tools. In metal removal operations, it is very difficult to calculate the cutting parameters such as cutting tool stresses, residual stresses, cutting tool-chip interface temperature and shear angle both experimentally and analytically. But, these operations could be easily calculated by computer-supported simulation tools. In these types of numeric simulations, using finite element method, it is needed to identify clearly the friction, material model load and limiting conditions. In this paper, the cutting parameters as cutting and thrust power, heat transfer coefficient and friction coefficient at chip-tool interface which is needed to find the temperature distribution on drilling bit and workpiece material were calculated using analytic models.
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    Development of bone chip-vacuum system in orthopedic drilling process
    (Springer Heidelberg, 2021) Gök, Kadir; Erdem, Mehmet; Kisioğlu, Yasin; Gök, Arif; Tümsek, Mert
    Overheating occurs during the bone drilling process using drill bits in orthopedic surgery. The temperatures frequently exceed 47 degrees C, usually accepted as critical value, since the bones and surrounding tissues burn and then cause the necrosis during the drilling process. To prevent this, orthopedic surgeons either spray coolants to the drilling zone or pause the drilling process until the bones and tissues cool down. Such heat damage in bones and soft tissues is undesirable event for surgeons. The bone chips, sometimes, are also complicating the bone fracture fixations. In this study, an investigation is described the effects of the processing parameters on bone chip formations, temperature levels and chip-vacuuming performances during drilling. The temperature levels are also measured using thermocouple devices. A bone chip collecting system is developed as a specific device to collect the chips or fragments using vacuuming technique. The collected bone chips are stored in a pot (reservoir) and delivered to a reparative site in case of necessary. Some design parameters for the developed vacuum system are identified considering the temperature rise during the drilling process. Analyzing the effects of these parameters on chip formation and developed vacuum system statistically and some results are presented. At the end of the study, the bone chip-vacuum device was developed and performed successfully to collect the whole fragments in the bone drilling experimental tests. The chip-collecting device was also useful to remove overheat from the drilling zone. The optimal level of the processing parameters was calculated as A1B3C1 for both vacuumed and non-vacuumed conditions. The fractured powder-type chips were formed as anticipated using the cortical structure of diaphyseal part of calf bone which is helpful for chip vacuuming device.
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    Development of software to calculate of friction process parameters used in friction drilling process
    (2021) Gök, Kadir; Erdem, Mehmet; Gök, Arif; Bilgin, Mehmet Burak
    Friction drilling processes are used frequently in hot forming operations. This process is similar todrilling processes but it has not chips and used to join of thin-walled metal components. The createdfrictional heat plasticizes the material and allows the punch type tool to enter the material surface,thus creating additional heat by friction. By the feeding tool pressure, it is advancing into the materialsurface while creating a hole. An analytic model and software was developed to calculate the frictiondrilling process parameters as torque and axial power, heat transfer coefficient for friction drillingprocess in this study.