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Diwakar Reddy, V.
- Design and Fabrication of Asymmetric Multi-Electrodes for Fabrication of Corrugated Steel Panels
Abstract Views :184 |
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Authors
Affiliations
1 Dept. of Mechanical Engineering, Sri Venkateswara University College of Engineering, Tirupati, Andhra Pradesh, IN
1 Dept. of Mechanical Engineering, Sri Venkateswara University College of Engineering, Tirupati, Andhra Pradesh, IN
Source
Manufacturing Technology Today, Vol 15, No 1 (2016), Pagination: 25-30Abstract
The sandwich composites are multilayered materials made by bonding stiff, high strength skin facings to low density core material. The main benefits of using the sandwich concept in structural components are the high stiffness and low weight ratios. Open core metallic sandwich panels are novel type of structures, enabled by innovative fabrication and topology design tools. Such fabricated open core structures welding by Resistance Spot Welding (RSW). The problems associated with RSW are tendency of alloying with the electrode resulting in increased tool wear, and subsequent deterioration of weld quality. In this present work the experimental studies were conducted under type of spot weld, welding current, welding time, hold time and material combination. The complicated behaviour of this process must be analysed to set the optimum parameters to get good quality weld. Based on orthogonal array the experiments were conducted tensile strength test on universal testing machine find out Tensile strength which indicates shear load as per model, Ultimate Shear Stress (UTS) which indicates Shear stress of the weld joint and maximum displacement. The main objective is to predict the better operation conditions of spot weld and influence of each parameter is evaluated.
Keywords
Sandwich Panels, Corrugated Sheets, Multi-Electrodes, Resistance Spot Welding.
- Influence of Cutting Parameters on Surface Roughness, Metal Removal Rate and Power Consumption on En353 with Coated Tools by Anova
Abstract Views :162 |
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Authors
Affiliations
1 Department of Mechanical Engineering, BITS, Visakapatanam, IN
2 Department of Mechanical Engineering, S V Univerisity College of Engg., Tirupati, IN
3 Department of Mechanical Engineering, Andhra University, Visakapatanam, IN
1 Department of Mechanical Engineering, BITS, Visakapatanam, IN
2 Department of Mechanical Engineering, S V Univerisity College of Engg., Tirupati, IN
3 Department of Mechanical Engineering, Andhra University, Visakapatanam, IN
Source
Manufacturing Technology Today, Vol 12, No 3 (2013), Pagination: 10-23Abstract
The customers’ most specified requirement is surface roughness which is the indicator of surface quality. In manufactures point of view minimization of power consumption and maximization of metal removal rate is high priority. Hence, it is important to investigate the influence of cutting parameters on surface roughness (Ra); Metal Removal Rate (MRR) and Power consumption (PC). In the present paper, EN353 is considered as work piece material as it has wide applications in manufacturing of gears, frame structures, shafts etc,. Selected tools are PVD (PR1125) and CVD (CR5515) consists of the coating surfaces of TiAlN and TiCN+Al2O3+TiN respectively. Experiments were conducted by using Taguchi Design of experiments of L27 orthogonal array. Analysis of ANOVA on the experimental results of CVD and PVD tools on EN353 were presented and it is observed that, there is no coincidence of levels of operating cutting conditions for better surface roughness, maximum MRR and Minimum Power consumption.Keywords
Power Consumption, ANOVA, Design of Experiments, PVD, CVD.- Sensitivity Analysis of Surface Roughness of AISI 1040 Carbon Steel in Dry Turning Operation with PVD Tool Using Taguchi Method
Abstract Views :153 |
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Authors
Affiliations
1 Sri Venkateswara University, College of Engineering, Tirupati, IN
2 Swarnadhra College of Engineering, Narasapur, Andhra Pradesh, IN
1 Sri Venkateswara University, College of Engineering, Tirupati, IN
2 Swarnadhra College of Engineering, Narasapur, Andhra Pradesh, IN
Source
Manufacturing Technology Today, Vol 11, No 12 (2012), Pagination: 5-11Abstract
The present study is concentrated with orthogonal cutting of AISI 1040 carbon steel under dry turning conditions with PVD coated cemented carbide inserts. This paper presents the influence of cutting parameters on the surface roughness of carbon steels of AISI 1040 series. The investigations are carried out by conducting experiments based on Taguchi technique considering L27 orthogonal array. The investigations consists of surface roughness of the material under hot and cold conditions, this aspect is studied due to variation of temperature during turning process showing the affects of online monitoring of tool surface roughness. The other general investigations are signal to noise ratio and analysis of variance are employed to the parameters such as Material removal Rate (MRR). Finally, sensitivity analysis is carried out on most influenced cutting parameter to predict the surface roughness by obtaining the absolute fraction of variance.Keywords
PVD, CVD, Taguchi and Sensitivity.- On the Static and Dynamic Performance of Short Spiral Hydrodynamic Journal Bearing
Abstract Views :162 |
PDF Views:0
Authors
Affiliations
1 Dept. of Mech. Engg., Sri Venkateswara University, College of Engg., Tirupati, IN
2 Dept. of Mech. Engg., Y V University College of Engg., Proddatur, IN
1 Dept. of Mech. Engg., Sri Venkateswara University, College of Engg., Tirupati, IN
2 Dept. of Mech. Engg., Y V University College of Engg., Proddatur, IN
Source
Manufacturing Technology Today, Vol 9, No 4 (2010), Pagination: 14-22Abstract
Hydrodynamic journal bearings with circular cross section, when used in high speed rotating machinery such as Turbines, Compressors, Pumps, Engine Cranks and Large Milling Systems, etc., often face the problem of instability. In such high speed machinery non-circular bearings are widely used to support the oil whirl. The present paper focuses on one of the non-circular bearings called Spiral Bearing. Out of the two forms of spiral bearings i.e., convergent and divergent types, the study is done on static performance characteristics of short convergent spiral hydrodynamic journal bearing. After evaluating the fluid film thickness for the convergent spiral bearing, Reynolds equation is used to find the fluid film pressure and then in turn load carrying capacity, attitude angle and friction parameter are calculated. To obtain a closed form solution, the short bearing approximation is considered. Theoretical investigations on stability characteristics of hydrodynamic spiral journal bearing are also presented and then comparing with circular bearing. The results show that the effect of preload factor on bearing performance is significant. Compared to the narrow circular bearing, short spiral bearing has more load carrying capacity and stability towards oil whirls.Keywords
Hydrodynamic Bearings, Spiral Bearings, Dynamic Characteristics, Static Characteristics.- Synthesis of Hexagonal YMnO3 Nanoparticles by Sol-Gel Route and their Characterization
Abstract Views :331 |
PDF Views:2
Authors
Affiliations
1 Department of Mechanical Engineering, SVU College of Engineering, Tirupati, IN
2 Department of Physics, SV University, Tirupati, IN
1 Department of Mechanical Engineering, SVU College of Engineering, Tirupati, IN
2 Department of Physics, SV University, Tirupati, IN
Source
Manufacturing Technology Today, Vol 17, No 9 (2018), Pagination: 32-37Abstract
Hexagonal yttrium manganese oxide (h-YMnO3) nanoparticles were prepared by a modified citrate sol-gel process at a lower heating temperature (200°C-230°C) followed by grinding and calcination. The structure and morphology of the synthesized nanoparticles were studied using an X-ray diffraction (XRD) technique and scanning electron microscope (SEM). YMnO3 nanoparticles with a uniform micro structure were observed in SEM images. The XRD analysis showed that the prepared precursor powder was well crystallized. The elemental compositional analysis using energy-dispersive X-ray analysis (EDX) confirmed the elemental base composition of pure yttrium, manganese, and oxygen.Keywords
Hexagonal, YMnO3, Nanoparticles, Citrate sol-gel Process, X-ray Diffraction.References
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- Kyu-Jeong Choi , Woong-Chul Shin & Soon-Gil Yoon, Characteristics of ferroelectric YMnO3 thin films for MFISFET by MOCVD, Integrated Ferroelectrics ISSN: 1058-4587 (Print) 1607-8489 (Online).
- Kyoung-Tae Kim,Chang-Il Kim, The effects of drying temperature on the crystallization of YMnO3 thin films prepared by sol-gel method using alkoxides, Journal of the European Ceramic Society, 24 (2004) 2613–2617.
- Kiyoharu Tadanaga, Hiroya Kitahata, Tsutomu Minami, Norifumi Fujimura, and Taichiro ITO, Preparation and Dielectric Properties of YMnO3 Ferroelectric Thin Films by the Sol-Gel Method, Journal of Sol-Gel Science and Technology 13, 903–907 (1998).
- Aijun Han, Minchun Zhao, Mingquan Ye, Juanjuan Liao, Zhimin Zhang, Nan Li, Crystal structure and optical properties of YMnO3 compound with high near-infrared reflectance, Solar Energy 91, 2013, 32–36.
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- Tai-Chun Han, Wei-Lun Hsu, Wei-Da Lee, Grain size-dependent magnetic and electric properties in nanosized YMnO3 multiferroic ceramics, Nanoscale Research Letters, 2011, 6:201.
- Monika Tomczyk, Ana Maria Senos, Paula Maria Vilarinhoand Ian Michael Reaney, Origin of microcracking in YMnO3 ceramics, Scripta Materialia, 66 (2012) 288–291.
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- K.R. Balasubramanian, Kai-Chieh Chang, Feroz A. Mohammad, Lisa M. Porter, Paul A. Salvador, Jeffrey DiMaio, Robert F. Davis, Growth and structural investigations of epitaxial hexagonal YMnO3 thin films deposited on wurtzite GaN (001) substrates, Thin Solid Films 515 (2006) 1807–1813.
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- Shiqing Deng, Shaobo Cheng, Ming Liu, and Jing Zhu, Modulating Magnetic Properties by Tailoring In-Plane Domain Structures in Hexagonal YMnO3 Films, ACS Applied Materials and Interfaces 2016, 8, 25379−25385.
- Zhong Chen, Chun-Lu Ma, Fei-Xiang Wu, Y.B. Chen, Jian Zhou, Guo-Liang Yuan, Zheng-Bin Gu,Shan-Tao Zhang,Yan-Feng Chen, The electrical and magnetic properties of epitaxial orthorhombic YMnO3 thinfilms grown under various oxygen pressures, Applied Surface Science, 257 (2011) 8033–8037.
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- Aboalqasim Alqat, Zohra Gebrel, Vladan Kusigerski, Vojislav Spasojevic, Marian Mihalik, Matus Mihalik, Jovan Blanusa, Synthesis of hexagonal YMnO3 from precursor obtained by the glycine-nitrate process, Ceramics International 39 (2013) 3183–3188.
- Andrey Gavrikov, Pavel Koroteev, Andrey Ilyukhin, Nikolay Efimov, Andreas K. Kostopoulos, Aleksandr Baranchikov, Aleksandr Tyurin, Denis Kirdyankin, Konstantin Gavrichev, Floriana Tuna, Zhanna Dobrokhotova, New synthesis route for obtaining carbon-free hexagonal RE manganites via novel simple individual precursors. The interplay between magnetic and thermodynamic properties of hexagonal RMnO3 (R=Ho-Yb, Y), Polyhedron, 2016
- Experimental and Theoretical Investigations of Heat Generation in Radial Ball Bearing
Abstract Views :203 |
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Authors
Affiliations
1 Department of Mechanical Engineering, N.B.K.R. Institute of Science & Technology, Vidyanagar, IN
2 Department of Mechanical Engineering, S.V. University, Tirupati
1 Department of Mechanical Engineering, N.B.K.R. Institute of Science & Technology, Vidyanagar, IN
2 Department of Mechanical Engineering, S.V. University, Tirupati
Source
Manufacturing Technology Today, Vol 18, No 2 (2019), Pagination: 3-17Abstract
The usefulness of a radial ball bearing (RBB) is to support radial loads and to reduce the rotational friction. However, during its operating conditions, an unanticipated and vicious heating of balls in radial ball bearing takes place which results in degradation of its performance as well as accuracy. For this reason, it is important to calculate the heat generation in the bearings because if generated heat is not dissipated from the bearing surface, causes a temperature rise in inner race and gives rise to premature failure. In the present work, experimentally, heat generation is calculated by varying the bearing failure parameters such as external load, load position, and rotational speed. Furthermore, a theoretical model for estimation of heat generation in the radial ball bearing is proposed. Later, a correlation between the experimental and theoretical model is carried out. Ultimately, the proposed model reveals that it demonstrates better in estimating heat generation up to 0.45 m of load position without cooling condition. On the other hand, the predicted heat generation above 1.8 N of the external load has a minimal deviation with experimental values at with cooling condition. A better agreement observed between experimental results and the theoretical model.Keywords
RBB, Heat Generation, External Load, Load Position.References
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- Bossmanns B, Tu J.F. A power flow model for high speed motorized spindles- heat generation characterization. Journal of Manufacturing Science and Engineering. 2001; 123:494-505.
- Li H, Shin Y.C. Integrated dynamic thermosmechanical modeling of high speed spindles, Part1: model development. Journal of Manufacturing Science and Engineering. 2004; 126: 148-158.
- Jin C, Wu B, Hu Y. Heat generation modeling of ball bearing based on internal load distribution. Journal of Tribology. 2011; 45:8-15.
- Moorthy RS, RajaVP. An improved analytical model for prediction of heat generation in angular contact ball bearing. Arab Journal of Science and Engineering. 2014; 39:8111-8119.
- Takabi J, Khonsari MM. Experimental testing and thermal analysis of ball bearings. Journal of Tribology. 2013; 60: 93-103.
- Mitrovic RM, Atanasovska ID, Soldat ND, Momcilovic DB. Effects of operation temperature on thermal expansion and main parameters of radial ball bearings. Thermal Science. 2015; 19 (5):1835-1844.
- Dong Y, Zhou Z, Liu Z, Zheng K. Temperature field measurement of spindle ball bearing under radial force based on fiber Bragg grating sensors. Advances in Mechanical Engineering. 2015; 7(12):1–6.
- Li W, Tan QC. Thermal Characteristic Analysis and Experimental Study of a Spindle-Bearing System. Entropy. 2016; 18(271):1-25.
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- Enhancing Mechanical Properties of Friction Stir Welded Al Alloy Joints by Adding Magnesium Particles
Abstract Views :223 |
PDF Views:0
Authors
Affiliations
1 Department of Mechanical Engineering, Sri Venkateswara University, Tirupati, IN
1 Department of Mechanical Engineering, Sri Venkateswara University, Tirupati, IN
Source
Manufacturing Technology Today, Vol 18, No 10 (2019), Pagination: 10-17Abstract
Friction stir welding (FSW), a solid-State welding technique, is being extensively used in similar as well as dissimilar joining of Al Mg, Cu, Ti, and their alloys. In the present study, the two aluminum plates are joined by adding Magnesium particles of 60 mesh were the welding zone before the welding was carried. The variable parameters that affect much are taken as input parameters. They are tool rotation speed, tool traverse speed and three different joint profiles like (straight, inclined, semicircle) and with and without magnesium the paper discuss the influence of hardness, tensile strength, impact strength. The work material conducted AA6061 T6. Taguchi method based on L18 so used as DOE.Keywords
Friction Stir Welding, Tensile Strength, Yield Strength, Hardness, Different Joint Profiles, Magnesium Particles.References
- Tashkandi, MA; Al-Jarrah, JA; Ibrahim, M: Increasing mechanical properties of friction stir welded joints of 6061 aluminum alloy by introducing alumina particles, vol. 17, no. 2 (52), 2017, 29 – 40.
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- Gui-Feng, Zhang; Wei, Su; Jun, Zhang; ZhongXin, Wei; Jian-Xun, Zhang: Effects of shoulder on interfacial bonding during friction stir lap welding of aluminium thin sheets using tool without pin, Science Direct, 'Trans. Nonferrous Met. Soc. China', vol. 20, 2010, 2223-2228.
- Chen, ZW; Yazdanian, S: Friction Stir Lap Welding: material flow, joint structure and strength, 'Journal of Achievements in Materials and Manufacturing Engineering', 2012, 629-637.
- Puneet, Rohilla; Narinder Kumar: Experimental investigation of Tool Geometry on Mechanical Properties of Friction Stir Welding of AA6061, 'International Journal of Innovative Technology and Exploring Engineering', vol. 3, no. 3, 2013, 56-61.
- Jagadeesh Chandra Prasad, P; Hema, P; Ravindranath, K: Optimization Of Process Parameters For Friction Stir Welding of Aluminum Alloy Aa6061 Using Square Pin Profile, 'International Journal for Mechanical Engineering', vol. 3, no. 2, 2014, 456-465.
- Jagjeet Singh Chatha: Reviews on the Effects of Friction Stir Welding Parameters On Mechanical Properties of Dissimilar Metal Weld Joints, 'International Journal of Advanced Technology in Engineering and Science', vol. 2, no. 01, 2014, 205 - 209
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- Yokoyama, Takashi; Nakai, Kenji; Eiichi Sukedai: Tensile Properties and Constitutive Modelling of Friction Stir Welded AA6061-T6 Butt Joints, 'Journal of Solid Mechanics and Materials Engineering', vol. 5, no. 12, 2011, 161-171
- Advancement of Model for Examination of Temperature Impact in Radial Ball Bearing Utilizing Grid Technique for Damm Investigation
Abstract Views :283 |
PDF Views:0
Authors
Affiliations
1 Department of Mechanical Engineering, N.B.K.R.I.S.T., Vidyanagar, Nellore, Andhra Pradesh, IN
2 Department of Mechanical Engineering, S V University, Tirupati, Andhra Pradesh, IN
1 Department of Mechanical Engineering, N.B.K.R.I.S.T., Vidyanagar, Nellore, Andhra Pradesh, IN
2 Department of Mechanical Engineering, S V University, Tirupati, Andhra Pradesh, IN
Source
Manufacturing Technology Today, Vol 18, No 12 (2019), Pagination: 25-34Abstract
The main objective of the paper on Radial Ball Bearing (RBB) to lessen the warmth age on bearing surface and bolster spiral and hub stacking and it can stay away from the warmth age by grating, the wear and force misfortunes brought about by the relative movement between the metal materials. Warmth is produced by the heap position in the bearing framework, which cause the temperature expanding inside the bearing surface and expanded temperatures may offer ascent to untimely disappointments. Along these lines, it is essential to figure the temperature in the orientation because of burden position. Here a summed up model is created utilizing Dimensional Analysis of Matrix Method (DAMM) to assess dimensionless connection between’s the reaction and result parameters for the appraisal of warmth age on the bearing surface on a created test rig. Reaction Surface Methodology (RSM) is utilized for the experimentation and investigate the reliance of different factors on the warmth age of these course. A numerical investigation created in the examination demonstrated the viability of DAMM model along side the adequacy of burden position for location of warmth age on spiral metal roller surface.Keywords
RBB, DAMM, RSM, Load Position.References
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- Radivoje M, Mitrović; Ivana D, Atanasovska; Nataša D, Soldat; Dejan B, Momčilović: Effects of operation temperature on thermal expansion and main parameters of radial ball bearings, 'Thermal Science', vol. 19, no. 5, 2015, 1835-1844.
- Dong, Yanfang; Zhou, Zude; Liu, Zicheng; Zheng, Kai:Temperature field measurement of spindle ball bearing under radial force based on fiber Bragg grating sensors. Advances in Mechanical Engineering, vol. 7, no. 12, 2015, 1–6.
- Li, W; Tan, QC: Thermal Characteristic Analysis and Experimental Study of a Spindle-Bearing System, 'Entropy', 2016, vol. 18, no. 7, 271, 1-25