Yazar "Korkmaz, M.E." seçeneğine göre listele
Listeleniyor 1 - 6 / 6
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Application of Bumpers in Different Types of Railway Vehicles: A Short Review(Academic Enhancement Department, King Mongkut's University of Technology North Bangkok, 2022) El, Etri, H.; Korkmaz, M.E.; Gupta, M.K.In order to avoid traffic problems in developed countries, railway vehicles play an important role. Passengers, railway workers, goods, cargo utilization, and dangerous materials are being transferred using various railway vehicles, and each vehicle is designed for a specific manner. Such vehicles include different locomotives that work on either electric or diesel power, in addition to different wagons and carriages attached to these locomotives (passenger wagons, sleeping wagons, freight wagons, and several other types, etc.). Railway vehicles run on railroad tracks, these tracks are designed and maintained by specific machines (diagnostic machines, road renewal machines, ballast screening, tamping and regulating machines, etc.). Several methods are applied when coupling wagons or carriages to each other (automatic coupling, semi-automatic traction, and hook clutch drawbar) depending on vehicle type and function. Railroad vehicles are considered a safe transportation system compared to other systems because they use buffers and bumpers to ensure safety. This paper mounts a minor review of railway vehicles, machines used to make railroads, coupling systems, bumpers and, buffers used to ensure railway vehicle's safety, and also focuses on the previous studies conducted to enhance such bumpers and lessen collision effects. © 2022 King Mongkut's University of Technology North Bangkok. All Rights ReservedÖğe Finite Element Analysis of Thrust Force in Drilling of Al2014 Aluminum Alloy(TUBITAK, 2019) Korkmaz, M.E.; Çakiroglu, R.; Yagar, N.; Özmen, R.; Günay, M.The purpose of this work is to compare the experimental and simulational results of the thrust force in drilling of the Al2014 aluminum alloy with the uncoated cemented carbide tool. In the experimental study, drilling was performed using cutting parameters (cutting speed and feed rate) at different levels. Numerical analyzes for thrust force were performed using the ThirdWave Advantages simulation program, which is based on the finite element method. With constant feed rates of 0,1, 0,2 and 0,3 mm / rev, the thrust force decreased by 9,1%, 12,8% and 18,6%, respectively, with the cutting speed increased by 35%. At constant cutting speeds of 170, 200 and 230, the thrust force increased by 23,9%, 16,1% and 11%, respectively, by increasing the feed rate from 0,1 to 0,3 mm / rev. It has been determined that the thrust force decreases with increasing the cutting speed and increases with the increasing feed rate. The results of drilling simulation performed by finite element method were similar to experimental results. As a result of the study, it was determined that there was an average difference of 7% between the experimentally measured thrust force and the force values obtained as a result of the simulation. Finally, the applicability of the finite element model was proved. © 2019, TUBITAK. All rights reserved.Öğe Modelling and optimization of the surface roughness in high speed hard turning with coated and uncoated CBN insert(Gazi Universitesi, 2016) Yurtkuran, H.; Korkmaz, M.E.; Günay, M.This study focuses on predictive model for Ra and optimization of cutting conditions in high speed hard turning of X40CrMoV5-1 steel by CBN insert. Cutting speed, feed rate, depth of cut and coating condition have been considered as cutting parameters. The experiments have been performed in CNC lathe according to Taguchi L32 orthogonal array. The first order mathematical model for the Ra has been developed with multiple regression analysis. Optimization study with analysis of signal-to-noise (S/N) ratios has indicated that feed rate is the negatively most significant factor for Ra under dry cutting conditions. The best surface roughness has been achieved by the lower feed rate and uncoated CBN insert. © 2016, Gazi University Eti Mahallesi. All rights reserved.Öğe Optimization of honing parameters for renewal of cylinder liners(Gazi Universitesi, 2017) Günay, M.; Korkmaz, M.E.This study presented the optimization of honing parameters for surface roughness in plateau honing process used for renewal of engine cylinders. The honing experiments were performed based on Taguchi L9 orthogonal array. The honing parameters directly affected on surface roughness (Ra) were determined as linear speed (m/min), grain size and number of stroke with three different levels. These levels were adjusted by considering honing industry and investigations on honing process. The results of variance analysis showed that the most important factor on surface roughness is the grain size while number of stroke has insignificant effect. Finally, an optimization study has been performed with “the smaller the better” method and then confirmation experiment has been conducted. The results have shown that the optimum conditions for better surface roughness were determined as feed rate of 10 m/min, grain size of 220 and stroke number of 6 according to analysis of signal-to-noise (S/N) ratios under these cutting conditions. According to confirmation experiment, the difference between experiment and the calculated value was determined as 2.5%. Thus, the optimum levels of honing parameters for Ra were confirmed as confident in renewal of engine cylinders. © 2017, Gazi University Eti Mahallesi. All rights reserved.Öğe A Short Review on Measurement Methods in Machining of Aerospace Materials(Institute of Electrical and Electronics Engineers Inc., 2023) Korkmaz, M.E.; Gupta, M.K.; Krolczyk, J.B.; Krolczyk, G.M.; Li, Z.; Ross, N.S.In-process measurements are becoming more and more popular among businesses as a result of the numerous benefits they provide, including reduced production costs, improved product quality, and real-time analysis of both production and product quality of aerospace materials. It is anticipated that the method of measuring manufactured components known as 'in-process measurement' will become the standard practice in the not too distant future. After a description of the in-process measurement methods with the developed examples, an explanation of the usage of machine tools as a measurement device will be provided in this paper, along with the needs, issues, and challenges, and recent research work. © 2023 IEEE.Öğe Wear and Friction Mechanism of Stainless Steel 420 Under Various Lubrication Conditions: A Tribological Assessment With Ball on Flat Test(American Society of Mechanical Engineers (ASME), 2023) Gupta, M.K.; Demirsoz, R.; Korkmaz, M.E.; Ross, N.S.The application of stainless steel 420 is noted in various industrial sectors such as aerospace, automobile etc. However, the wear mechanism of stainless steel 420 is greatly affected by the use of 100Cr6 balls due to the adhesion and abrasion mechanism generated between the contact surfaces. In this work, the ball-on-flat experiments were performed on stainless steel-420 versus 100cr6 friction pairs under dry, minimum quantity lubrication (MQL) and pool conditions. Then, the wear studies in terms of volume loss, profile tracks, micrographs, coefficient of friction, etc. were performed. The results demonstrated that the MQL and pool conditions help to improve the tribological properties of stainless steel 420 alloy against 100Cr6 ball. Copyright © 2022 by ASME; reuse license CC-BY 4.0.
