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Öğe Analysis of tool vibration and surface roughness during turning process of tempered steel samples using Taguchi method(Sage Publications Ltd, 2021) Kam, Menderes; Demirtas, MustafaThis study analyzed the tool vibration (Vib) and surface roughness (Ra) during turning of AISI 4340 (34CrNiMo6) tempered steel samples using Taguchi Method. In this context, Taguchi design L-18 (2(1) x 3(2)) was used to analyze the experimental results. The vibration amplitude values from cutting tools were recorded for different machining parameters, control factors; two different sample hardness (46 and 53 HRc), three different cutting speeds (180, 220, 260 m.min(-1)), and feed rates (0.08, 0.14, 0.20 mm.rev(-1)) were selected. The machining parameters giving optimum Vib and Ra values were determined. Regression analysis is applied to predict values of Vib and Ra. Analysis of variance was used to determine the effects of machining parameters on the Vib and Ra values. The most important machining parameters were found to be the feed rate, sample hardness, and cutting speed for Vib and Ra, respectively. The lowest Vib and Ra values were obtained in 46 HRc sample as 0.0022 gRMS and 0.255 mu m, respectively. The surface quality can be improved by reducing the sources of vibration by using appropriate machining parameters. As a result, there is a significant relationship between Ra and Vib. The lower Ra values were found during turning process of tempered steel samples according to the literature studies. It is suggested that the process can be preferred as an alternative process to grinding process due to lower cost and machining time. In application of the turning of experiment samples by ceramic cutting tool, a substantial technological and economical benefit has been observed.Öğe COMPARATIVE ANALYSIS OF HATCH COVER STOCKING GANTRY CRANE HOOKS MANUFACTURED FROM ST37 AND WELDOX700 STEELS UNDER STATIC LOADING CONDITIONS(World Scientific Publ Co Pte Ltd, 2022) Şengül, Ömer; Kam, MenderesCrane hooks are used to ensure the safe transportation of loads to be lifted in load lifting and handling systems. In this study, special hooks for cranes designed to open and close the doors of warehouse zones used for ship cargo and cargo transport, and their responses under 60,000 N static loading conditions are numerically and experimentally analyzed. In the experimental study, ST37 structural steel and Weldox700 high-strength steel were used to manufacture the hook. Experimental data collected under static loading conditions of the component was measured via strain gauges sensors. It was concluded that the results of structural numerical analysis with the Finite Element Method (FEM) using ANSYS 2019 R3 analysis program with experimental data are in harmony with the results of experimental measurements. In addition, the maximum values of stress of the hook manufactured with Weldox700 and ST37 steels under the stress static loading conditions are obtained as 60 MPa and 57.3 MPa, respectively. In the numerical analysis results, stress value was obtained as 61.21 MPa. Compared to the analysis results based on experiments and FEM, numerical analysis results showed that fudge factors in ST37 and Weldox700 steels are 1.8% and 6%, respectively. This result confirms that experimental and mathematical data were in harmony with each other and reliable.Öğe Derin Kriyojenik İşlemin Farklı Bekletme Sürelerinin AISI 4140 (42CrMo4) Çeliğin Mekanik Özelliklerine Etkisi(2018) Kam, Menderes; Saruhan, HamitBu çalışmada, özellikle otomotiv endüstrisinde yaygın olarak kullanılan AISI 4140 (42CrMo4) çeliğinin mekanik özellikleri üzerinde farklı bekletme süreli derin kriyojenik işlemin etkisi incelenmiştir. Bu amaçla hazırlanan AISI 4140 çeliğinden imal edilen numunelere geleneksel ısıl işlem uygulanmış ve geleneksel ısıl işlemi tamamlayıcı bir işlem olan derin kriyojenik işlem farklı bekletme sürelerinde (12, 24, 36 ve 48 saat) - 140 C sıcaklıkta uygulanmıştır. Derin kriyojenik işlem sonrasında numunelere 200 C’ de temperleme işlemi uygulanmıştır. AISI 4140 çeliğin mekanik özelliklerinin belirlenebilmesi için sertlik ölçüm ve çekme testleri gerçekleştirilmiştir. Bu testlerden elde edilen bulgular analiz edilmiş ve karşılaştırılmıştır. Sonuçlar, farklı bekletme süreli derin kriyojenik işlemin ve derin kriyojenik işlem sonrası uygulanan temperleme işleminin AISI 4140 çeliğin mekanik özellikleri üzerinde önemli etkileri olduğunu göstermiştir. Derin kriyojenik işlemli numunelerde önemli sertlik artışları ve çekme dayanımlarında kayda değer iyileşmeler olmuştur. Ayrıca, mekanik özelliklere etkisi yönünden derin kriyojenik işlemin en uygun bekletme süresinin 36 saat olduğu tespit edilmiştir. Derin kriyojenik işlemli numunelerin çekme dayanımlarında yaklaşık % 10 ve sertlik değerlerinde ise yaklaşık % 5 iyileşme olduğu görülmüştür.Öğe Dönen Makinelerde Eksenel Kaçıklık ve Dengesizliğin Titreşim Analizi(2020) Alçelik, Necdet; Kam, MenderesDönen makine parçalarına dinamik kuvvetlerin etki etmesiyle bu parçalar üzerinde farklı frekans ve genliktetitreşim oluşabilmektedir. Çok küçük boyuttaki titreşimler rezonansa neden olurken büyük boyutlu titreşimlergürültünün oluşmasına neden olmaktadır. Dönen makine üzerinde eksen kaçıklığı ve dengesizlik ihmaledilemeyecek öneme sahip arızalardır. Eksen kaçıklığı ve dengesizliğin sebep olduğu titreşimler dönen milleraracılığı ile rulmanlı yataklara aktarılır. Bu çalışmada 1380 d/d sabit devirde dönen bir elektrik motorundanhareket alan yatak ekseni kaçık imal edilmiş bir dönen makine-mil sisteminin eksenel kaçıklığının vedengesizliğinin titreşime olan etkileri deneysel olarak incelenmiştir. Dönen makine üzerinde 8 adet deneyyapılmış ve elde edilen veriler, dört kanallı VIBROTEST 80 model FFT analizi yapabilen veri toplama cihazı ilealınmıştır. Titreşim verilerinin toplam ortalaması, kare ortalamalarının karekökü (RMS) yöntemi ilebelirlenmiştir. Alınan bu veriler ışığında titreşim verilerinin tahammül edilebilir sınırlar içinde olup olmadığıdeğerlendirilmiştirÖğe Dynamic Behavior Analysis of Rotor Supported by Damped Rolling Element Bearing Housing(Gazi Univ, 2017) Saruhan, Hamit; Kam, Menderes; Kara, FuatA typical rotating machinery system consists various components, such as rotor, support bearing, and disks. These components pass out energy into the system when coincident to critical speeds. Ignoring such event might lead to disastrous breakdown of the system. Due to necessity and vital contribution to most rotating machineries, the requirements on rolling element bearings have become stricter every day. In this experimental study, the dynamic behavior and displacement of rotor supported by damped rolling element bearing housing for different running speeds and load levels are analyzed and compared.Öğe Effects of deep cryogenic treatment on machinability, hardness and microstructure in dry turning process of tempered steels(Sage Publications Ltd, 2021) Kam, MenderesThis study investigated the effects of Deep Cryogenic Treatment (DCT) on machinability, hardness, and microstructure in dry turning process of AISI 4140 (48-51 HRc) tempered steels with ceramic cutting tools on the surface roughness (Ra). DCT process of steels has shown significant improvement in their mechanical properties. In this context, experiments were made with Taguchi L-16 method and optimum values were determined. Three different values for each control factors as: different heat treated samples, cutting speeds (160, 200, 240, 280 m/min), feed rates (0.08, 0.12, 0.16, 0.20 mm/rev) were selected. As a result, the lowest Ra value was found to be 0.159 mu m for the DCTT36 sample at a cutting speed of 240 m/min, a feed rate of 0.08 mm/rev. The optimum Ra value was the lowest for the DCTT36 sample compared to the other samples as 0.206 mu m. The hardness values of the micro and macro were highest for the DCTT36 sample. Microstructural point of view Scanning Electron Microscopy (SEM) point of view, the DCCT36 sample showed that best results owing to its homogeneity. It was concluded that lower Ra values can be obtained with ceramic cutting tool in dry turning experiments according to the studies in the literature review. It is thought to be preferred as an alternative to cylindrical grinding process due to lower cost.Öğe Elektro Galvaniz İşleminin St37 Ankraj Elemanının Korozyon Mekanizmasına Etkisinin Araştırılması(2022) Kam, Menderes; Gerengi, Hüsnü; Dikmen, Kader; Akmaz, Volkan; Maraşlı, MuhammedDüşük karbonlu çelik alaşımları; başta inşaat, otomotiv, beyaz eşya ve petrokimya olmak üzere birçok üretim sektöründe, fiyat /performans oranı göz önünde bulundurularak yoğun miktarda kullanılmaktadır. Bu çalışmada, cam elyaf katkılı beton (GRC: Glassfibre Reinforced Concrete) ile birlikte kullanılan elektro galvanizli ve galvanizsiz St37 ankraj pad elemanının, %3.5 NaCl ortamındaki korozyon mekanizması Elektrokimyasal Empedans Spektroskopisi (EIS) ve Potansiyodinamik Polarizasyon (TP) yöntemleri kullanılarak araştırılmıştır. Elektro galvaniz işleminin, ankraj pad elemanını %3.5 NaCl ortamında yaklaşık 3.2 kat daha iyi koruduğu belirlenmiştir. İki saat boyunca açık devre potansiyelleri (OCP) incelenmiş ve elektro galvaniz işlemi uygulanmamış metalin potansiyel değişimi yaklaşık 235 mV olurken, elektro galvaniz işlemi uygulanmış metalde bu değişim sadece 9 mV olmuştur. Deney öncesi ve sonrası optik resimlerle metal yüzeyindeki deformasyonların elektrokimyasal verileri desteklediği görülmüştür.Öğe EXPERIMENTAL ANALYSIS OF THE EFFECT OF MECHANICAL PROPERTIES AND MICROSTRUCTURE ON TOOL VIBRATION AND SURFACE QUALITY IN DRY TURNING OF HARDENED AISI 4340 STEELS(World Scientific Publ Co Pte Ltd, 2021) Kam, Menderes; Demirtas, MustafaAISI 4340 (34CrNiMo6) steel is a difficult to machine steel material because of its high hardness and tendency to get strain hardened. These steels are mostly used in manufacturing of the axle parts, drive coupling, and rotating shafts due to their high mechanical properties. In this experimental study, the effects of mechanical properties and microstructure on tool vibration and surface quality in dry turning of hardened AISI 4340 steels were investigated. Test samples were classified as Raw Material (RM), Conventional Heat Treatment (CHT) and Tempering process (T). The experiments were carried out under dry cutting conditions by different cutting parameters on the CNC turning lathe. Three axes vibration amplitude values (along the x-, y- and z-directions) were measured using accelerometers as online and surface roughness (Ra) values were measured with the surface roughness device. Tool vibrations and Ra values were found to be lower in T sample compared to the RM and CHT samples. When the samples were analyzed in terms of microstructure and mechanical properties, it was seen that the tensile strength increased as the hardness values increased. After the tempering process at 200(circle)C, pearlite and bainitic structures emerged along with the martensite structure. The surface quality that can be obtained on a cylindrical grinding lathe, has been reached with the dry turning process. Significant gains have been achieved in terms of cost and time.Öğe Experimental Analysis of Vibration Damping Capabilities of Sleeve Bearings Printed Using FDM Method(Gazi Univ, 2022) Kam, Menderes; Saruhan, Hamit; Ipekci, AhmetIn this study, vibration damping capabilities of sleeve bearing printed from PA12 (Nylon) filament material using Fused Deposition Modeling (FDM) method was experimentally analyzed. A total of a pair of 15 sleeve bearings samples for supporting rotating shaft were printed in different filling structures (Honeycomb, 3D Honeycomb, Gyroid, Hilbert curve, Archimed cords) with different occupancy rates (10, 30 and 50 %). The experiments were performed for rotating shaft running speed of 900 rpm. Vibration amplitude values were collected with accelerometers mounted on the sleeve bearing supports. The results showed that filling structures and occupancy rates had very important role in damping capabilities of sleeve bearings.Öğe Experimental and Statistical Analysis of the Effect of Process Parameters on Mechanical Properties of 3D Printed Copper Reinforced Composite Samples(Chinese Soc Mechanical Engineers, 2022) Kam, Menderes; İpekçi, AhmetThe effects of 3D printing process parameters on mechanical properties of three-dimensional (3D) printing copper reinforced Polylactic acid (PLA) composite samples were analyzed as experimentally and statistically. In this context, tests were carried out with orthogonal array Taguchi method. Control factors were determined by using the Taguchi method for optimum mechanical properties. Two different filament materials (PLA and PLA+20% Copper Reinforced Composite), three different filling structures (Octogram spiral - Os, Archimedian cords - Ac, and 3D Honeycomb - Hc), and three different occupancy rates (10, 30, and 50%) were determined. The results showed that significant improvements in mechanical properties of PLA+20% copper reinforced composite samples were observed. According to the regression equations, optimum mechanical properties were found to be as 29.277MPa at tensile strength, 3.503% at percentage elongation, 3.458kJ/m(2) at izod impact values. Mechanical properties can be improved by using appropriate 3D printing process parameters. Occupancy rate and filling structure show a similar relationship for tensile strength and izod impact values. Hc filling structure can be selected for products which strength property is important. Os filling structure can be preferred for products when elongation and damping properties are required.Öğe EXPERIMENTAL AND STATISTICAL INVESTIGATION OF SURFACE ROUGHNESS AND VIBRATION DURING FINISH TURNING OF AISI 4140 STEEL WORKPIECE UNDER COOLING METHOD(World Scientific Publ Co Pte Ltd, 2021) Kam, Menderes; Seremet, MusaIn this study, the surface roughness (R-a) and vibration (Vib) during finish turning of AISI 4140 (52HRc) steel workpiece under cooling method were investigated as experimental and statistical. Taguchi method was used in statistical investigation of obtained data from the finish turning experiments. As cutting parameters, cutting speed: 160, 200, 240 and 280m/min, feed rate: 0.08 and 0.16mm/rev, depth of cut: 0.15 and 0.3mm, and cooling method: dry/wet were selected for this experimental study. Vibration values during finish turning of steel workpiece were collected online by accelerometers and R-a measurement device was used to obtain the R-a values. Optimum R-a and Vib values were obtained in finish turning of this workpiece. The cutting parameters determined for optimum R-a values were obtained as 0.08mm/rev of feed rate, 200m/min of cutting speed, wet turning process of cooling method, and 0.30mm of depth of cut. Optimum Vib values were obtained as 0.08mm/rev, 240m/min, dry turning and 0.15mm. Experimental results for the lowest R-a and Vib were found as 0.219 mu m and 0.003463gRMS. The predicted values for the R-a and the Vib were 0.222 mu m and 0.003328gRMS, respectively.Öğe Experimental investigation and optimization of machining parameters of deep cryogenically treated and tempered steels in electrical discharge machining process(Sage Publications Ltd, 2022) Kam, Menderes; İpekçi, Ahmet; Argun, KudbeddinElectrical Discharge Machining (EDM) is commonly used as non-traditional manufacturing methods for geometrically complex shaped or hardened materials that are extremely difficult-to-machine with traditional machining processes. In this experimental study, investigations were carried out on the machining of Conventional Heat Treated three different deep cryogenically treated and tempering processes (DCT&T) of AISI 4140 steels in EDM process. The process parameter such as discharge current (9, 16, 23, and 30 A), pulse on time (120, 180, 240, 300 mu s) and pulse off time (12, 18, 24, and 30 mu s) were investigated and the output responses like surface roughness, electrode wear ratio, material removal rate, and machining time were explored. Experiments were conducted using L-16 orthogonal array in EDM machining process. The data obtained from experiments were analyzed. As a result, determination of discharge current (30 Amps), pulse off time (12 to 18 mu s), pulse on time (180 to 240 mu s) and deep cryogenically treatment with 24 h and 48 h holding time as the optimum machining processing parameters for tempered steels to be subjected to DCT&T process. As a result of multi-criteria optimization, it is suitable for best surface quality and fast material removal rate.Öğe Experimental investigation of the effect of machinability on surface quality and vibration in hard turning of hardened AISI 4140 steels using ceramic cutting tools(Sage Publications Ltd, 2021) Kam, Menderes; Seremet, MusaIn industry, hardened steels are used in manufacturing of the products such as machine parts and components. In this context, surface quality and vibration play a significant role for control of cutting parameters and cutting conditions in turning process of hardened steel materials. In this study, it was aimed to investigate the effect of machinability on surface quality (Ra and Rz) and vibration in hard turning of conventional heat treated (CHT) and tempered (T) AISI 4140 (42CrMo4) steel samples using ceramic cutting tools under dry environment. They were selected as cutting parameters; four different cutting speeds (120, 160, 200, and 240 m/min), three different feed rates (0.05, 0.10, and 0.15 mm/rev), and depth of cut (0.2 mm). To make the turning process more efficient and to measure the occurring vibrations, the data were obtained online from the ceramic cutting tool by accelerometers in three axes (x-Ch1, y-Ch2, and z-Ch3 directions). In addition, test results of hardness, tensile, microstructure images, Ra - Rz values, and chip thickness values of the experiment samples were analyzed and compared. With the microstructure obtained after the tempering process applied to the T sample, it was seen that it is more machinable and affects the surface quality - vibration positively. The results showed that the most important cutting parameter affecting vibration and surface quality was found to be the feed rate. The lowest Ra value was found as 0.144 mu m at 200 m/min of cutting speed and 0.05 mm/rev of feed rate in the T sample. The lowest vibration amplitude value (Ch3) was measured as 0.0023 gRMS (Root Mean Square) at 120 m/min of cutting speed and 0.05 mm/rev of feed rate. According to the Ra and Rz values found in the literature studies, better surface qualities were obtained in the present study.Öğe Experimental investigation of vibration damping capabilities of 3D printed metal/polymer composite sleeve bearings(Sage Publications Ltd, 2022) Kam, Menderes; Saruhan, Hamit; İpekçi, AhmetAdditive Manufacturing (AM) method enables to produce products easily, cheaply and quickly with more complex geometry compared to traditional production methods. In this context; Fused Deposition Modeling (FDM) is a widely used for AM method that requires a large number of process parameters. In this study, it is aimed to experimentally investigate the damping capabilities of the metal/polymer composite sleeve bearings printed using FDM. A total of 54 pieces (27 pairs) were printed from composite filaments such as nine pairs for each of PLA, PLA + 20% Bronze, and PLA + 20% Copper metal/polymer with different filling structures (Octogram spiral, Archimedian chords, and 3D Honey comb) and different occupancy rates (10, 30, and 50%), respectively. The experiments were carried out using the shaft-bearing system under the same operating conditions at a rotational speed of 900 revolution per minute (rpm), and vibration data was collected from the rotating shaft with proxy probes. Rotating shaft position is very important to determine journal position in bearing for understanding deterioration in the bearing. Bode and Orbit plots are used to detect the level of deterioration in the bearing. The value of bearing to shaft clearence can vary widely depending on application. Since the bearings were heavily loaded, they were compressed by radial load caused large clearence. The results showed that compressed bearing had significant influence on the stability of rotating shaft system and significant differences in damping capabilities of composite sleeve bearings with different filling structures and occupancy rate. Increasing occupancy rate decreases the vibration amplitude values in copper-reinforced sleeve bearing but increases in bronze-reinforced sleeve bearing. From the microstructure analysis, it has been observed that the vibration absorbation capability is better due to the more homogeneous distribution of the copper reinforced bearings than the bronze reinforced bearings. Also, vibration absorption capability of sleeve bearings with 3D Honeycomb filling structure is increased significantly proportion to the occupancy rate.Öğe Experimental Spectral Analysis of Split Sleeve Bearing Clearance Effect on a Rotating Shaft System(2016) Saruhan, Hamit; Kam, MenderesBearing are one of the most widely used elements in rotating shaft systems with great risk of failure that can affect the systems. There are two broad types of bearings used in rotating shaft system: sleeve bearings or journal bearings and rolling element bearings. Split sleeve bearings are used for application where it is necessary to remove a cap for servicing or replacing bearing. Proper clearance between the shaft and the bearing is necessary to avoid vibration or loss of concentric orbit. The performance of rotating shaft system is very dependent on vibration generated by bearings. The use of vibration signal analysis is one of the most reliable measurement for this purpose. The main objective of the present study is experimentally to investigate the role of bearing clearance that is a critical parameter affecting dynamic characteristics of rotating shaft systems. The vertical bearing clearance through introduction of additional shims is operand to simulate a loose -worn- split sleeve bearing. Wear is responsible for many problems and large cost in rotating shaft system. Three different clearances configurations using shims have been tested. The results showed that a worn bearing will have a significant influence on the stability of rotating shaft system.Öğe Experimental Vibration Analysis of Cryogenic Treated Shafts Supported by Journal and Rolling Element Bearings(Gazi Univ, 2019) Kam, Menderes; Saruhan, HamitIn this study, the effects of cryogenic treatment and tempering on the vibration behaviors of rotating shafts mounted on the rolling element and journal bearings were investigated for the same loading conditions and operating speeds. In this experimental study, the data obtained with the help of proxy probes were analyzed and the results were compared. The results showed that the lowest amplitude values were obtained for the cryogenic treated shaft mounted on the journal bearing. The amplitude values of journal bearing are significantly superior to the rolling element bearings having stability in account.Öğe Fan kanatlarındaki dengesizliğin ve yuvarlanmalı yatak arızasının titreşime etkisi(2023) Kam, Menderes; Gülle, SerkanDönen makine sistemlerinde, arızanın erken belirlenebilmesi sadece makine elemanlarını korumak için değil, aynı zamanda büyük bir arızadan önce mevcut arızanın tespit edilebilmesi için de gereklidir. Bu çalışmada, fan kanatlarında oluşan dengesizliğin ve yuvarlanmalı yatak (rulman) arızasının titreşime etkisi incelenmiştir. Bu bağlamda, bir yuvarlanmalı yatakta oluşan iç bilezik hatasının ve fan kanatlarında oluşan dengesizliğin rulmandan ve fan motorundan alınan ölçüm sonuçları ile belirlenebilmesi amacıyla kullanım yerinde çalışma gerçekleştirilmiştir. Titreşim ölçümleri ve analizi için VSE150 titreşim analizörü ile VSA001 kodlu ivmeölçer kullanılmıştır. Elde edilen bulgular analiz edilmiş ve sonuç olarak, titreşim analizinin titreşime sebep olan etkenlerin tespit edilmesinde etkin olarak kullanılabileceği görülmüştür. Sonuçlar, titreşim analizi ile rulman arıza tespitinin başarılı bir şekilde yapılabileceğini ortaya koymaktadır.Öğe Farklı Bekletme Süreli Derin Kriyojenik İşlemin Sementasyon Çeliğinin Korozyon Davranışına Etkisinin Araştırılması(2022) Kaya, Ertuğrul; Güney, Furkan; Gerengi, Hüsnü; Kam, Menderes; Yıldız, MesutBu çalışmada sementasyon çeliğinin %3,5 NaCl ortamındaki korozyon davranışına, uygulanan gaz sementasyon, temperleme ve farklı bekletme süreli derin kriyojenik işlemin (-196 °C’de 24, 36, 48 saat) etkisi araştırılmıştır. Beş farklı grupta sınıflandırılan numunelerin korozyon testleri; Elektrokimyasal Empedans Spektroskopisi (EIS) yöntemiyle incelenmiş ve Taramalı Elektron Mikroskobu (SEM) ile metal yüzeyinin ne kadar bozulduğu görsel olarak bakılmış ve Enerji Dağılımlı X-ışını Spektroskopisi (EDS) ile analiz edilmiştir. Bulgular, sementasyon, temperleme ve kriyojenik işlem uygulamalarının sementasyon çeliğinin korozyon hızını azalttığını göstermektedir. Semantasyon işlemi sonrasında 24 saat bekletme süreli derin kriyojenik işlem yapılan N3 numunesinin diğer numunelere göre %3,5 NaCl ortamında çok daha az korozyona uğradığı yapılan elektrokimyasal ve yüzey görüntüleme yöntemleriyle ortaya konulmuştur.Öğe Farklı Doldurma Şekillerinin Üç Boyutlu Yazıcılarda Üretilen Ürünlerin Mukavemetine Etkisi(2019) Kam, Menderes; Kam, Menderes; İpekçi, AhmetBu çalışmada, farklı doldurma şekillerinin Ergiyik Depolayarak Modelleme (Fused Deposition Modelling -FDM) yöntemi ile imal edilen ürünlerin mukavemetine etkisi deneysel olarak incelenmiştir. Çalışmada filamentmalzeme olarak PET-G (Polyethylene Terephthalate Glycol) kullanılmış ve farklı doldurma şekillerinde(Rectilinear, Grid, Triangular, Wiggle, Fast honeycomb, Full honeycomb), doluluk oranı (%30), işleme hızı(4200 mm/dak), nozul çapı (0,40 mm), nozul sıcaklığı (230 ºC), katman kalınlığı (0,20 mm) olmak üzere ISO527-2 standardına uygun ürünler imal edilmiştir. Bu numunelerin çekme mukavemetlerini incelemek için çekmetestleri gerçekleştirilmiş ve testlerden elde edilen sonuçlar karşılaştırılmıştır. Sonuçlar yazdırma şekillerinin ürünmukavemeti üzerinde önemli etkisi olduğunu göstermiştir. Rectilinear doldurma şeklinde imal edilen ürünlerdeelde edilen mukavemet değerleri diğer doldurma şekillerine göre yaklaşık % 15 daha yüksek çıkmıştır. Ayrıca,Full honeycomb doldurma şeklinin diğer doldurma şekillerine göre daha fazla uzama gösterdiği görülmüştür.Öğe FDM Yöntemi ile Üretilen Kovan Yatakların Titreşimi Sönümleme Kabiliyetlerinin Deneysel Analizi(2022) Kam, Menderes; Saruhan, Hamit; İpekçi, AhmetBu çalışmada, Ergiyik Depolayarak Modelleme (Fused Deposition Modelling - FDM) yöntemi ile üretilen kovan yatakların desteklediği milin titreşimlere karşı sönümleme kabiliyetleri deneysel olarak analiz edilmiştir. Çalışmada, PA12 (Nylon) filament malzeme kullanılarak farklı doldurma şekillerinde (Honeycomb, 3D Honeycomb, Gyroid, Hilbert curve, Archimed cords) ve doluluk oranlarında (% 10, 30 ve 50) toplam 30 adet kovan yatak üretilmiştir. Kovan yatakları analiz etmek için mil-yatak sisteminde aynı çalışma şartlarında 900 dev/dak mil dönme hızında deneysel çalışma gerçekleştirilmiş, kovan yatakların desteklerine bağlanan ivmeölçerler ile titreşim verileri toplanmıştır. Elde edilen sonuçlara göre, kovan yatakların titreşimi sönümleme kabiliyetlerinde önemli farklılıklar olduğu ve genel olarak doluluk oranları arttıkça titreşim genlik değerlerinin daha düşük olduğu görülmüştür .