Browsing by Author "Gök, K"

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    COMPARISON OF THE SUCCESS OF META-HEURISTIC ALGORITHMS IN TOOL PATH PLANNING OF COMPUTER NUMERICAL CONTROL MACHINE
    Çaska, S; Gök, K; Gök, A
    Carrying out an engineering process with the least cost and within the shortest time is the basic purpose in many fields of industry. In Computer Numerical Control (CNC) machining, performing a process by following a certain order reduces cost and time of the process. In the literature, there are research works involving varying methods that aim to minimize the length of the CNC machine tool path. In this study, the trajectory that the CNC machine tool follows while drilling holes on a plate was discussed within the Travelling Salesman Problem (TSP). Genetic Algorithms (GA), Particle Swarm Optimization (PSO), and Grey Wolf Optimizer (GWO) methods were used to solve TSP. The case that the shortest tool path was obtained was determined by changing population size parameter in GA, PSO, and GWO methods. The results were presented in tables.
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    Numeric Simulation of Effect on The CBN Cutting Tool Stresses of Austempering Process
    Gök, K; Gök, A
    In this study, we were investigated the effect of austempering process on the cutting tool stresses. The cutting forces obtained from experimental studies (main cutting force, feed force and passive force) were applied to rake face, main cutting edge, auxiliary cutting edge on the cutting tool as three dimensional in the ANSYS Workbench program. To emphasize the role of the austempering process, Ductile Iron (DI) specimens were firstly austenitized in salt bath at 900 degrees C for 60 min, after which they were quenched in a salt bath at 250 degrees C and 325 degrees C for 60 min. The equivalent stress (von-Mises), shear stress (Tresca), normal stresses in the X, Y and Z directions on the cutting tool were calculated at the end of the analysis.
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    EFFECTS OF CUTTING PARAMETERS AND TOOL-PATH STRATEGIES ON TOOL ACCELERATION IN BALL-END MILLING
    Gök, A; Gök, K; Bilgin, MB; Alkan, MA
    The determination of the cutting-parameter values that cause increases in vibration values is important to minimize the errors that can occur. Thus, the first aim of this study was to investigate the optimum cutting-parameter values and tool-path strategies in ball-end milling of the EN X40CrMoV5-1 tool steel with three coated cutters using the Taguchi method. The parameters taken into consideration are the cutting speed, feed rate, step over and tool-path strategies. The second aim of the study, a model for the tool acceleration as a function of the cutting parameters, was obtained using the response-surface methodology (RSM). As a result, the most effective parameter within the selected cutting parameters and cutting strategies for both inclined surfaces and different coatings was the step over. In terms of tool coatings, the most deteriorating coating for the tool acceleration on both inclined surfaces was the TiC coating. In addition, the response-surface methodology is employed to predict the tool-vibration values depending on the cutting parameters and tool-path strategy. The model generated gives highly accurate results.
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    Biomechanical Effects of Four Different Configurations In Salter Harris Type 4 Distal Femoral Epiphyseal Fractures
    Gök, K; Inal, S; Gök, A
    In this study, the biomechanicaleffects of four different configurations (Parallel K wires, Parallel Screw, Upper K wire-Lower Screw, Upper Screw-Lower K wire), which are used for stabilizing Salter-Harris (SH) Type 4 epiphyseal fracture of distal femur after reduction process, on the epiphyseal plate has been investigated under axial, rotational and bendingforces in order to determine the most advantageous configuration. The fourdifferent configurations have been modeled by using SolidWorks and computer-aided numerical analyses were performed by finite element analysis software. The mesh process, boundary conditions and material model have been applied in finite element analysis software for each configuration. In addition, von-Mises stress values on epiphyseal plate, screws and K wires have been calculated. There is a general near trend on stress values in all configurations on physis line under bending (varus-valgus angulation, anterior-posterior angulation) and torsional forces in the frontal, sagittal and transverse plane respectively. Considering the axial forces, the highest stress was found on parallel K- wires configuration in physis while the lowest stress was found in parallel screw configuration. It has been found particularly advantageous to use fixation type in parallel screw configuration. In addition, in SH type 4 epiphyseal fracture, fixation type is found to be disadvantageous in K wire configuration.