Person: KURT, MUSTAFA
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KURT
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MUSTAFA
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Publication Metadata only Evaluation of drilled hole quality in Al 2024 alloy(SPRINGER LONDON LTD, 2008) KURT, MUSTAFA; Kurt, M.; Kaynak, Y.; Bagci, E.This paper deals with experimental investigation in the role of different coating, point angle, cutting parameters (cutting speed and feed rate) on the hole quality (hole size, surface roughness, roundness and radial deviation of produced hole) in drilling of Al 2024 alloy. The parameters of hole quality are analyzed under varying cutting speeds (30, 45 and 60 m/min), feed rates (0.15,0.20 and 0.25 mm/rev), depths of cut (2, 15 and 25 mm) and drills (uncoated point angle:118 degrees, TiN Pa:118 degrees, TiAlN Pa:118 degrees, Co 5% Pa:130 degrees, TiN Pa:130 degrees). This study includes dry drilling with 10 mm HSS drills with an axial depth of cut of 30 mm. This study indicate that results of the radial deviations show a similar tendency with the hole size. Hence, it can also be concluded from the experimental results that the radial deviations are effected tool vibrations during drilling. The results of this work show that cutting parameters and coatings have different effects on hole quality. However, when dry drilling aluminum alloys, HSS Co 5% drills show good performance compared to an uncoated, TiN and TiAlN coated drills. Besides, effective results have been obtained using low cutting speed and feed rate. Additionally, the best hole quality obtains from near the bottom of the produced hole.Publication Metadata only Influence of molding conditions on the shrinkage and roundness of injection molded parts(SPRINGER LONDON LTD, 2010) BAKIR, BARKIN; Kurt, Mustafa; Kaynak, Yusuf; Kamber, Omer S.; Mutlu, Bilcen; Bakir, Barkin; Koklu, UgurDuring the plastic injection molding process, one of the biggest challenges is shrinkage which deteriorates the quality of produced parts. To control and reduce this defect, the essential way is to perfectly determine the variables like molding parameters. In this study, the effects of molding parameters including packing pressure, melt temperature, and cooling time on shrinkage and roundness have been investigated experimentally. Also, the relationship among initial molding parameters, the cavity pressure, and mold temperature was investigated. The results of this experimental study and analysis fulfill various requirements of plastic injection molding and clarify the relationship between molding conditions and the overall quality of produced parts. This study illustrated that packing pressure and melt temperature are dominant factors which determine the quality of parts.Publication Metadata only Feedrate optimisation/scheduling on sculptured surface machining: a comprehensive review, applications and future directions(SPRINGER LONDON LTD, 2011) KURT, MUSTAFA; Kurt, Mustafa; Bagci, EyupFree-form or sculptured surface milling is one of the continually used manufacturing processes for die/mould, aerospace (especially turbine blades), precision machine design, bio-medical devices and automotive industries. Developments of machining technologies for quality enhancement of machining results have become a very important fact in current real industry. Therefore, reducing milling time, tool wear, cutter deflection and improving surface texture quality and machining operations through adaptation and optimisation of tool feedrates based on changing surface geometry in sculptured surface machining is a great step in this direction. Various feedrate optimisation strategies have different feedrate rescheduling control parameters such as chip thickness, material removal rate (MRR), min(mrr,chip,force), max(expo.Acc/dec) and resultant forces. Some commercial CAM softwares come with MRR-based feedrate optimisation algorithms which have a very short calculation time. However, commercial feedrate scheduling systems have some limitations in generating the scheduled feedrates because they use the MRR or the cutting force model which is dependent on milling conditions. However, for the processes in which machining precision/accuracy is very important, it is inevitable that mechanistic force-based feedrate optimisation approaches, for which the calculation time is improved, will be integrated into commercial CAM software packages. Here, developing only the mechanistic cutting force-based algorithm is not enough. In this paper, improvement and optimisation of machining feedrate value, which is one of the cutting parameters which has a tremendous effect on the precise machining of free-form surfaces, was discussed by using the virtual machining framework. For this purpose, the boundary representation solid modelling technique-based free-form milling simulation and feedrate optimisation system integrated with commercial CAD/CAM software is developed for three-axis ball-end milling. This review study includes the information regarding the following topics: The algorithms developed for the feedrate value optimisation, MRR calculation approaches, cutting force computation methods, details of algorithms, the effects on the surface accuracy, the effects on the machining time, the capabilities of the present commercial CAM software packages, the encountered difficulties and overcoming those difficulties, recent developments and future research directions.Publication Open Access CFD and statistical analysis of flow mass ratios on temperature and pressure drops of double pipe heat exchanger(2023-06-01) EVRAN, SAVAŞ; KURT, MUSTAFA; Evran S., Kurt M.In this numerical and statistical study, the effect of mass flow rates for shell and fluid temperature for tube on temperature and pressure drops was analyzed in double pipe heat exchanger under counterflow. Numerical calculations were performed using computational fluid dynamics (CFD) in ANSYS Fluent. Calculations were carried out according to the L8 orthogonal array with two control factors in accordance with Taguchi method. Although the different mass flow rates of the fluid passing through the shell were chosen as the first control factor, different fluid temperatures of the fluid passing through the tube were selected for the second control factor. Signal-to-noise ratio analysis was used to decide the impacts and optimum levels of the mass flow rates and fluid temperatures on temperature and pressure drop. The significance levels and contribution percentages of each variable on the temperature and pressure change occurring in the heat exchanger were calculated using analysis of variance. The accuracy of the analyses was compared numerically and statistically by comparing the obtained optimum CFD results with the estimated Taguchi results. This study can be used as a guiding research in the project and cost calculations of heat exchangers to be produced experimentallyPublication Open Access Determination of Surface Qualities on Inclined Surface Machining with Acoustic Sound Pressure(ASSOC MECHANICAL ENGINEERS TECHNICIANS SLOVENIA, 2012-10-15) KURT, MUSTAFA; Gok, Arif; Gologlu, Cevdet; Demirci, Ibrahim H.; Kurt, MustafaDie parts used in automotive and aviation industry have complicated surfaces that require multiaxis machining. In machining of inclined surfaces with ball-end milling, the process is of great significance for its correctness and accuracy. In this study, Acoustic Sound Pressure (ASP) generated during the machining of a workpiece at a vertical machining centre has been measured. The experiments have been conducted in association with cutting velocity, feed rate and step over parameters determined by using different surface forms and different cutter path strategies. Therefore, the aim of this study is to understand the relationships between the generated sound signals and surface roughness in the machining of inclined concave and convex surfaces. In the experiments, the workpiece material of EN X40CrMoV5-1 hot work tool steel, which is commonly used in the related die industry, has been chosen. The ball end mills with two indexable inserts with three different coatings of TiC, TiN, and TiAlN have been used. The results show that there is a rise at the value of surface roughness with a rise at the value of acoustic sound pressure and that surface roughness could be figured out with acoustic sound pressure level.Publication Metadata only Effect of cutout shape and material type on modal analysis of plates(2022-11-23) EVRAN, SAVAŞ; KURT, MUSTAFA; EVRAN S., KURT M.Publication Metadata only Fatigue damage-based topology optimization of helicopter tail rotor pitch arm(2022-09-01) KURT, MUSTAFA; Demir S., KURT M., Kotil T.© 2022 American Society of Civil Engineers.Topology optimization studies have found widespread use with advances in additive manufacturing technologies. A topology optimization method is proposed for the design of a fatigue critical part, namely, a pitch arm made of Al 7050, which transmits the commands to change the pitch attitude to the rotor blades of the helicopter. This study used the bidirectional evolutionary structural optimization (BESO) method with the fatigue failure criterion of a closed Soderberg (CS). The mean stress and stress amplitude values used in the procedure were obtained by applying the Manson-McKnight method. The calculations were performed using a Python-based script compatible with Ansys version 2021 R1 software. In the finite-element calculations, the sensitivity number of the elements was determined using the results of the linear static analysis. A volume constraint was applied in the formulation of the optimization problem to minimize the weight of the structure. The results of the classical topology optimization approach and the developed optimization method were compared. The final geometries of both approaches showed that the ranges of volume reduction differed from each other. It was found that the values for the new fatigue-optimized weight of the pitch arm were 18% higher than the values for the static-based classical topology optimization method. However, in general, the weight of the part obtained as a result of fatigue-based topology optimization was reduced by 34% in total.Publication Metadata only Effect of geometry and locatıon of crack on modal analysıs of beams(2023-08-04) KURT, MUSTAFA; MUTLU MİTİL, BİLÇEN; Kurt M., Mutlu Mitil B.Publication Metadata only Static, dynamic and fatigue analysis of a semi-automaticgun locking block(PERGAMON-ELSEVIER SCIENCE LTD, 2009) EKİCİ, BÜLENT; Ozmen, Dogan; Kurt, Mustafa; Ekici, Bulent; Kaynak, YusufReduction of the recoil forces on shotgun parts and even effects on the human body are a considerable importance during design of the semi-automatic shotgun parts. These forces are strongly affected by the dynamics of motion of rifle parts upon firing. Therefore, managing of these recoil forces would be crucial issue to produce functional, ergonomic, safe, reliable, and robust designs. in the literature, many researchers have investigated static, dynamic, and fatigue behaviors of most mechanical parts which especially take a role under the dynamic loads. However, shotgun parts have not been investigated formally yet. Therefore, in this study we particularly focused on investigating static, dynamic, and fatigue behaviors of a semi-automatic shotgun's locking block, which is an integral part of the shotgun mechanism during firing. In this study, techniques such as hardness measurements, analysis of the recoil forces of a semi-automatic shotgun, and finite element analysis were performed. Pro/Engineer Wildfire 3.0 series software was used to model the locking block and the other parts of the gun. Moreover, the finite element code ANSYS/LS-DYNA, and ANSYS Workbench were used to determine the stress distribution, and fatigue behaviors of the locking block, based on the Morrow Theorem. (C) 2009 Elsevier Ltd. All rights reserved.Publication Metadata only Experimental investigation of plastic injection molding: Assessment of the effects of cavity pressure and mold temperature on the quality of the final products(ELSEVIER SCI LTD, 2009) ATAKÖK, GÜRCAN; Kurt, Mustafa; Kamber, O. Saban; Kaynak, Yusuf; Atakok, Gurcan; Girit, OguzToday more than ever, the molding industry demands better product quality. The quality of molded parts is crucial with regard to their functional capacity, and hence a great deal of attention should be directed towards maintaining consistent tolerances and overall dimensions. As the demand for high quality final parts continues to increase, the controlling parameters of cavity pressure and mold temperature become ever more significant in the plastic injection molding process. Therefore, in this research, cavity pressure and mold surface temperature have been measured and recorded by pressure and temperature-pressure sensors using a Kistler CoMo 2869A injection-type apparatus. The influences of the measured factors on the quality of the final parts have been investigated experimentally. The results of this experimental study indicate that cavity pressure and mold temperature are the dominant factors determining the quality of the final product in plastic injection molding. (C) 2009 Elsevier Ltd. All rights reserved.
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