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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 22, Issue 6 - Dec 2013
Volume 22, Issue 5 - Oct 2013
Volume 22, Issue 4 - Aug 2013
Volume 22, Issue 3 - Jun 2013
Volume 22, Issue 3_1spc - Jun 2013
Volume 22, Issue 2 - Apr 2013
Volume 22, Issue 1 - Feb 2013
Selecting the target year
Performance Evaluation of High Pressure and High Pressure Drop Control Valve for Offshore Plants
Kim, Kyuchul ; Lee, Chiwoo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 767~773
DOI : 10.7735/ksmte.2013.22.5.767
A high-pressure, high-pressure drop control valve, which transforms the power transfer of a system by reducing the inlet pressure of 345bartothe outlet pressure of 112bar, is a fundamental component in an offshore plant process. With the increasingly growing market share of the maritime industry, this valve has been expected to be a high-value-added product. This study not only analyzes the relation between pressure drop and fluid velocity in a trim by using fluid analysis, but also examines the possibility of cavitation in a valve in addition to the plot for the extension of lifespan. Based on the analysis results, the design and production method of the valve are established, and accordingly, performance evaluation is carried out. It is demonstrated that the pressure drop from 345bar to 112bar is more feasible in the presence of the trim, which can induce a continuous and diminutive pressure drop in order to prevent cavitation in a high-pressure drop control valve. Furthermore, despite the fluid velocity near a seatring being found to be over 30m/s, the lifespan of the valve is determined to be adequate considering the operation condition of a prototype valve of 80%.
A Structural Analysis and Optimization of a 60 N.m Class Flexible Disk Coupling
Lee, H.K. ; Kim, B.R. ; Kim, S.M. ; Kim, J.B. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 774~781
DOI : 10.7735/ksmte.2013.22.5.774
A structural analysis was carried out for a 60 N.m class flexible disk coupling. Flexible disk couplings are used to transmit power between two shafts. When a flexible coupling is used, some amount of misalignments such as angle of deviation and end play can be allowed in assembling the shafts. However, the maximum allowable misalignment should be decided to guarantee the fatigue life. In this study, the effect of the angle of deviation and end play on the maximum stress was investigated. From the analysis results, it was shown that the angle of deviation has a greater effect on the maximum stress than the end play. Furthermore, the dimensions of the disk plate were optimized to realize a better design. From the optimization, the maximum stress could be reduced by up to 5.2%.
A Study on Application of Finite Element Method to the Impact test for the Safety of the Splash Guard of a CNC Machine Tool
Kim, Tae Won ; Choi, Jin Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 782~788
DOI : 10.7735/ksmte.2013.22.5.782
This study addresses the issue of safety of the splash guard of a computer numerical control (CNC) machine tool at the design stage. As an impact test for evaluating safety requirements such as strength under the safety regulation is an expensive and iterative task, it is necessary to develop a new method to minimize the task of the impact test for development of the machine tool. In this study, explicit finite element method was adopted for replacement of the impact test of the splash guard of a machine tool at the design stage. A finite element model was developed for implementing the impact test on an actual vertical CNC lathe and then produced the analysis including plastic strain and deformation to enable the safety of its splash guard to be determined. The analysis results demonstrated that the finite element method can be applied to safety evaluation for design of the splash guard of a CNC machine tool.
Thermal Durability Analysis Due to Material of Radiator Fan
Han, Moonsik ; Cho, Jaeung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 789~794
DOI : 10.7735/ksmte.2013.22.5.789
In this study, the temperature, heat emission per unit time, and thermal stress or deformation of a radiator fan made of polyethylene or aluminum are analyzed for investigating its strength durability. Heat transfer in the case of the aluminum radiator fan is better than that in the case of the polyethylene radiator fan. Further, heat emission in the case of the aluminum fan is poorer than that in the case of the polyethylene fan. Moreover, because the thermal deformation of aluminum is much smaller than that of polyethylene, the thermal durability of the aluminum fan is better than that of the polyethylene fan. In an open space in front of the radiator and the closed space of the engine behind it, the thermal cooling effect of the polyethylene fan is better than that of the aluminum fan. Further, since polyethylene is lighter in weight than aluminum, polyethylene, as a nonmetallic plastic, is more suitable as a material of an automotive radiator. However, because of the higher strength durability of the aluminum fan, it is better than the polyethylene fan under high-temperature conditions or in the case of a complex pipe.
Vibration Electrochemical Polishing (VECP) for Improved Surface Defects of Stainless Steel
Kim, Uk Su ; Park, Jeong Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 795~799
DOI : 10.7735/ksmte.2013.22.5.795
This paper describes a novel hybrid surface polishing process combining non-traditional electrochemical polishing (ECP) with external artificial ultrasonic vibration. The purpose of this study is to develop an easier method for improving stainless steel surfaces. To this end, vibration electrochemical polishing (VECP), a novel ultrasonic manufacturing process, for enhancing electrochemical reaction and surface quality compared with that achieved using conventional ECP is suggested. In addition, for finding the optimized experimental conditions, the two methods are compared under various current densities. Localized roughness of the work material is measured with atomic force microscopy (AFM) and scanning electron microscopy (SEM) for obtaining detailed surface information.
Forming Accuracy Comparison Between Positive and Negative Incremental Forming Al 1050
Lee, Kyeong-Bu ; Oh, Hyun-Man ; Kang, Jae-Gwan ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 800~805
DOI : 10.7735/ksmte.2013.22.5.800
Incremental forming of sheet metal is a modern method of forming sheet metal, where parts can be formed without the use of dedicated dies. Existing experimental configurations for incremental forming can be broadly classified into two categories, i.e., negative and positive forming. In this paper, forming qualities such as shape accuracy and surface roughness of Al 1050 material were discussed for different forming methods. The formed and the corresponding opposing surfaces were measured with a three-dimensional scanner and a surface roughness tester. It was found that in terms of shape accuracy, the best opposing surface was obtained with positive forming, whereas the worst formed surface was obtained with negative forming; furthermore, the opposing surface is always better than the formed surface, regardless of the forming method used.
Fabrication and Characterization Evaluation of Prepreg with Unidirectional Glass Fibers for Use of Automobile Bumper Beams
Kim, Hyoung-Seok ; Kim, Jin-Woo ; Seo, Jin ; Lee, Dong-Gi ; Sim, Jae-Ki ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 806~811
DOI : 10.7735/ksmte.2013.22.5.806
In this study, to prevent the nonhomogeneity of fiber orientation during the molding of GFRP composites, GFRP prepreg was fabricated using roving fiber and polypropylene resin. Analyses on the degree of impregnation, tensile strength, and microstructure were conducted on the fabricated prepregs. A lower pulling speed, higher resin temperature, and longer die length showed a greater degree of impregnation of the prepreg. The scanning electron microscope (SEM) micrograph showed, a homogeneous fiber orientation. As a result, fundamental techniques for improved productivity were suggested for the manufacturing field.
The Temperature Dependence of the Diffusion Bonding Between Tungsten Carbides for Micro WC-PCD Tool Fabrication
Jeong, B.W. ; Park, J.W. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 812~817
DOI : 10.7735/ksmte.2013.22.5.812
This study demonstrates the diffusion bonding process between a tungsten carbide shank (K30) and tungsten carbide (DX5) for micro WC-PCD tool fabrication. A type of nickel alloy was used as the filler met alto improve the bond ability between K30 and DX5. The bonding pressure, time, and surrounding conditions were kept constant. In particular, the normal pressure was controlled precisely under buckling analysis. Diffusion bonding was performed at various operation temperatures (1170-1770 K) by using a specially designed jig. The microstructure on the localized bonded surface was analyzed using scanning electron microscopy and optical microscopy. In the case of diffusion bonding of WCat 1370-1770K, the filler metal melted completely and diffused between the two base metals, and they were bonded more tightly on both sides than at temperatures below 1370 K. Our results demonstrated the importance of sensitive temperature dependence of diffusion bonding.
Research on Ultrasonic Sterilization Effect of Treatment Equipments
Lee, Yanglae ; Kim, Hyunse ; Baek, Minhyuck ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 818~823
DOI : 10.7735/ksmte.2013.22.5.818
In the process of sterilization during the manufacture of beverages, both the treatment time and the temperature influence the beverage taste and flavor. Therefore, to improve the beverage quality, a nonthermal sterilization method is preferred to a high-temperature one. A nonthermal method, ultrasonic treatment by shock waves from cavitation, has been known to have a sterilizing effect. In this study, to observe the effect of ultrasonic frequency and treatment time on beverage quality, batch type ultrasonic equipment was fabricated and tested. Further, to evaluate the applicability of this ultrasonic method to an in-situ process, flow type ultrasonic heptagonal equipment was fabricated and then used to perform a sterilization experiment. Subsequently, the sterilizing effect was measured under ultrasonic and low-temperature (
) treatments. Based on the obtained results, ultrasonic sterilization technology that can be applied for treatments at flow rates of up to 3 L/min was developed.
Numerical Analysis and Experiment of Environmental Control Cell for Ultra-nano Precision Machine
Oh, S.J. ; Kim, C.S. ; Cho, J.H. ; Kim, D.Y. ; Seo, T.B. ; Ro, S.K. ; Park, J.K. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 824~830
DOI : 10.7735/ksmte.2013.22.5.824
In ultra-precision machining, the inside temperature should be controlled precisely. The important factors are environmental conditions (outside temperature, humidity) and temperature conditions (cutting heat, spindle heat). Thus, in this study, an environmental control cell for the ultra-precision machine that could control the inside temperature and minimize effects of the surrounding environment to achieve a thermal deformation of less than 400nm of a specimen was designed and verified through C.F.D. Further, a method that could control the temperature precisely by using a blower, heat exchanger and heater was evaluated. As a result, this study established a C.F.D technic for the environmental control cell, and the specimen temperature was controlled to be within
Fabrication of PDMS Mold by AFM Based Mechanical TNL Patterning
Jung, Y.J. ; Park, J.W. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 831~836
DOI : 10.7735/ksmte.2013.22.5.831
This study demonstrates the process of fabricating patterns using tribonanolithography (TNL),with laboratory-made micro polycrystalline diamond (PCD) tools that are attached to an atomic force microscope (AFM). The various patterns are easily fabricated using mechanical scratching, under various normal loads, using the PCD tool on single crystal silicon, which is the master mold for replication in this study. Then, polydimethylsiloxane (PDMS) replica molds are fabricated using precise pattern transfer processes. The transferred patterns show high dimensional accuracy as compared with those of TNL-processed silicon micro molds. TNL can reduce the need for high cost and complicated apparatuses required for conventional lithography methods. TNL shows great potential in that it allows for the rapid fabrication of duplicated patterns through simple mechanical micromachining on brittle sample surfaces.
Control of a Rotary Inverted Pendulum System Using Brain Emotional Learning Based Intelligent Controller
Kim, Jae-Won ; Oh, Chae-Youn ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 837~844
DOI : 10.7735/ksmte.2013.22.5.837
This study performs erection of a pendulum hanging at a free end of an arm by rotating the arm to the upright position. A mathematical model of a rotary inverted pendulum system (RIPS) is derived. A brain emotional learning based intelligent controller (BELBIC) is designed and used as a controller for swinging up and balancing the pendulum of the RIPS. In simulations performed in the study, a pendulum is initially inclined at
with respect to the upright position. A simulation is also performed for evaluating the adaptiveness of the designed BELBIC in the case of system variation. In addition, a simulation is performed for evaluating the robustness of the designed BELBIC against a disturbance in the control input.
Robust Control of Two-axes Precise Stage Using LMI Optimization
Kim, Yeung-Shik ; Park, Heung-Seok ; Kim, In-Soo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 845~851
DOI : 10.7735/ksmte.2013.22.5.845
In this paper, a robust optimization approach is applied to the two-axes stage using a piezoelectric actuator for precise motion tracking. Robust control is based on LQG/LTR (linear quadratic Gaussian control with loop transfer recovery) control. Further, an LMI (linear matrix inequality) is used to find the optimal parameter in the loop transfer recovery step, instead of a trial and error method. A decoupler in the shape of FIR filter is added to reduce the coupling effect between the motions of the two axes, and hence, the feedback control loop is designed independently for each axis motion. The experimental result shows that the proposed control scheme can be applied effectively for motion control of the two-axes stage.
A Study of Feedrate Optimization for Tolerance Error of NC Machining
Lee, Hee-Seung ; Lee, Cheol-Soo ; Kim, Jong-Min ; Heo, Eun-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 852~858
DOI : 10.7735/ksmte.2013.22.5.852
In numerical control (NC) machining, a machining error in equipment generally occurs for a variety of reasons. If there is a change in direction in the NC code, the characteristics of the automatic acceleration or deceleration function cause an overlap of each axis of the acceleration and deceleration zones, which in turn causes a shift in the actual processing path. Many studies have been conducted for error calibration of the edge as caused by automatic acceleration or deceleration in NC machining. This paper describes a geometric interpretation of the shape and processing characteristics of the operating NC device. The paper then describes a way to determine a feedrate that achieves the desired tolerance by using linear and parabolic profiles. Experiments were conducted by the validate equations using a three-axis NC machine. The results show that the machining errors were smaller than the machine resolution. The results also clearly demonstrate that the NC machine with the developed system can successfully predict machining errors induced with a change in direction.
Optimal Design of Press-Fitted Axle Shaft Considering Stress Relief
Ko, Jaechun ; Lee, Jongsoo ; Choi, Ha-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 859~864
DOI : 10.7735/ksmte.2013.22.5.859
Creation of a stress relief groove is a fairly simple yet high-performance method. During the application of this method, it is important to consider the location and size of the groove in order to achieve better performance. Consequently, this research proposes an approach for optimizing the application of the stress relief groove method to a press-fitted assembly. In a boss design, the position and diameter of the groove are configured as design variables and the design of experiments is applied. Based on this information, a 3D model is built and analyzed using the finite element analysis software ABAQUS. Meta-models are created using back-propagation neural networks. Then, deterministic optimization results obtained from a genetic algorithm are compared with the results of the finite element analysis. The temperature sensitivity of the optimized model is analyzed, and finally, reliability-based design optimization is conducted for enhancing the design quality.
Estimation of Machinability Turning Process for Al7075-T6 by Cryogenic Heat Treatment
Lim, Hak Jin ; Oh, Jeong Kyu ; Kim, Pyeong Ho ; Lee, Jong Hwan ; Kim, Jeong Suk ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 865~870
DOI : 10.7735/ksmte.2013.22.5.865
In recent years, aluminum processing has been increasing in the aerospace, vehicle, airplane industries etc., because aluminum has abundant resources and has a high specific strength. Aluminum alloys have a high coefficient of thermal expansion therefore, it is necessary to consider the temperature problem in the cutting process. The objective of this research is to investigate the machinability of a hardened aluminum alloy Al7075-T6 by using cryogenic heat treatment. The machining test is conducted by comparing the cutting force and surface roughness, corresponding to various cutting conditions of depth of cut, cutting speed, and feed rate, with those of Al7075-T0.
A Basic Study on Induction Heating and Water Cooling System Hybrid Roll for Fine Pattern Processing
Jo, Sang-Hyun ; Kim, Byung-In ; Son, Young-Soo ; Yun, Dongwon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 871~878
DOI : 10.7735/ksmte.2013.22.5.871
Roll-to-roll (R2R) hot embossing systems have been developed and are widely used in various industrial domains. These systems press and heat flexible films between a press roll and a back-up roll, as said films pass through the two rolls. In previous studies, a heating roll was used for heating. However, in this study, a hybrid roll for R2R hot embossing is conceptualized and developed. This R2R system can be used for generating fine patterns on large and continuous films. The hybrid roll of our system can cool and heat the films simultaneously, thus affording greater flexibility in process design. Thermal and structural analyses were performed for developing the hybrid roll. In addition, a hybrid roll was designed based on analytical results. Experiments were conducted for measuring the performance of the developed hybrid roll.
A Study on the Structural Integrity of Transportable Heavy-duty Tracking-mount
Kim, Byung In ; Son, Young Soo ; Park, Cheol Hoon ; Lee, Sung Hwi ; Ham, Sang Yong ; Jo, Sang Hyun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 879~885
DOI : 10.7735/ksmte.2013.22.5.879
Satellites provide a lot of information and essay roles in the areas of defense and space observations. The precise distances to the satellites are measured by emitting and retro-reflecting a laser. For such surveys, satellite laser ranging (SLR) systems have been developed in different forms and for different areas. The structural integrity of the tracking mount is essential for it to be able to track a high-speed satellite precisely, overcoming the various external and internal disturbances and operating conditions. In this study, the analysis of a tracking mount was performed for weight, wind loads, and inertia loads in order to verify its soundness. The results of the comparison between aluminum and steel were analyzed in order to select the optimal material for the fork and main housing part. In addition, the natural frequency and mode shape were predicted. Optimal material selection and structural integrity will also be verified using static analysis.
Finite Element Analysis of Statics and Natural Characteristic of Vibrating Screen
Hong, Seok-Beom ; Kwon, Hyuk-Hong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 5, 2013, Pages 886~893
DOI : 10.7735/ksmte.2013.22.5.886
A vibrating screen with multiple decks is widely employed for the process separation of many valuable export commodities. In this study, the inclination angle of the deck of the vibrating screen and the direction angle of the screen`s vibration under single particle kinematics were predicted. A finite element model of the vibrating screen was established by parameterization modeling. Through modal analysis and static analysis of the model, the natural frequency, natural vibration mode, and stress distribution of the structure were determined, based on which the dynamics and design optimization of the vibrating screen could be achieved. Future plans also reflect this by conducting detailed design of vibrating screens for the manufacturing plans of vibrating screen machine.