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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 20, Issue 6 - Dec 2011
Volume 20, Issue 5 - Oct 2011
Volume 20, Issue 4 - Aug 2011
Volume 20, Issue 3 - Jun 2011
Volume 20, Issue 2 - Apr 2011
Volume 20, Issue 1 - Feb 2011
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A Study on the Collapse Characteristics of Al/CFRP Square Structural Member for Light Weight
Hwang, Woo-Chae ; Sim, Jae-Ki ; Yang, In-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 219~224
Aluminum or CFRP is representative one of the lightweight materials. Collapse behavior of Al/CFRP square structural member was evaluated in this study based on the respective collapse behavior of aluminum and CFRP member. Al/CFRP square structural members were manufactured by wrapping CFRP prepreg sheets outside the aluminum hollow members in the autoclave. Because the CFRP is an anisotropic material with mechanical properties, The Al/CFRP square structural members stacked at different angles(
where the direction on
coincides with the axis of the member) and interface numbers(2, 3, 4, 6 and 7). The axial impact collapse tests were carried out for each section members. Collapse mode and energy absorption characteristics of the each member were analyzed.
Cutting Force Modelling in End-milling Considering Runout
Cho, Hee-Geon ; Kim, Jong-Do ; Yoon, Moon-Chul ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 225~231
In this paper, a new end-milling force modelling technique was suggested by considering runout, and its result was compared with real measured force. The specific cutting force is the multiplication of cutting force coefficient and uncut chip thickness. This parameter was used for experimental modelling and prediction of theoretical force. These coefficients, which can be obtained by fitting measured average forces in several conditions, were used for the formulation of theoretical force. The mechanism of end-milling force with runout was developed in this research and its result was verified by comparing the fluctuating theoretical force and its measured one. The fluctuation of force was incurred by a geometric shape of workpiece and its runout in holding. The result of suggested force considering runout shows a good consistency with measured one. So this modelling method can be used effectively for a prediction of end-milling force with runout effect.
Determination of Optimal Cutting Conditions in Milling Process using Multiple Design of Experiments Technique
Kim, Yong-Sun ; Kwon, Won-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 232~238
In the present study, Taguchi method is used to determine the rough region first, followed by RSM technique to determine the exact optimum value during milling on a machining center. A region reducing algorithm is applied to narrow down the region of the Taguchi method for RSM. The result from the Taguchi method is fed to train the artificial neural network (ANN), whose optimum value is used to drive the region reducing algorithm. The proposed algorithm is tested under different cutting condition and results show that the introduced algorithm works well during milling process. It is also shown that theoretically obtained optimal cutting condition is very close to experimentally obtained result.
Study on Durability by Structural Analysis of Bulldozer
Han, Moon-Sik ; Cho, Jae-Ung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 239~244
This study analyzes the behaviors on stress, fatigue and vibration about bulldozer in operation. Maximum equivalent stress is shown with the frequency of 100 Hz in case of the harmonic vibration analysis applied with force. Among the cases of nonuniform fatigue loads, 'SAE bracket history' with the severest change of load becomes most unstable but 'Sample history' becomes most stable. In case of 'Sample history' with the average stress of 0 to -105MPa and the amplitude stress of 0 to
, the possibility of maximum damage becomes 3.23%. This stress state can be shown with 5 times more than the damage possibility of 'SAE bracket history' or 'SAE transmission'. The structural result of this study can be effectively utilized with the design of bulldozer by investigating prevention and durability against its damage.
UV/Thermal Hybrid Nanoimprint System for Flexible Substrates
Lim, Hyung-Jun ; Lee, Jae-Jong ; Choi, Kee-Bong ; Kim, Gee-Hong ; Ahn, Hyun-Jin ; Ryu, Ji-Hyeong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 245~250
An UV/thermal hybrid nanoimprint lithography system was designed and implemented for the pattern transfer to flexible substrates. This system can utilize a plate stamp, roll stamp, and film stamp. For all cases of using those stamps, this system is also switchable an UV or thermal nanoimprint lithography mode. This paper shows how to design the heating and UV curing plates and proposes how to change them easily. Because the pressure condition and the speed of the press roller varies by the characteristics of the stamp and substrate, all the parameters related to the nanoimprint lithography have to adjustable. Some transferred patterns are shown in this paper to verify the performance of the hybrid nanoimprint lithography system. The flexible substrates with nano-scale patterns on them will be key components for next generation technologies such as flexible displays, bendable semi-conductors, and solar cells.
Design of an Electrodynamic Wheel for Transfer of Conductive Rod
Park, Sung-Jun ; Jung, Kwang-Suk ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 251~256
Instead of multi-phase ac current, the magnetic field travels spatially through mechanical rotation of permanent magnets at the electrodynamic wheel (EDW). Traveling of magnetic field generally leads to a generation of inductive force in the traveling direction. In this paper, we suggest a spiral EDW to travel the magnetic field in the axial direction of the conductive rod. So, it is possible to levitate and transfer the rod through multi-axial forces by the spiral EDW. However, physical dimensions of permanent magnets constituting EDW influence relative ratios between three-axial forces generated on the rod. Therefore, the sensitivity analysis for design parameters is performed using FEM analysis. The stable operation is verified experimentally.
Hydrox Generator for Steel Manufacturing
Kim, Hong-Gun ; Kwac, Lee-Ku ; Lee, Woo-Gum ; Cha, Hwa-Dong ; Shin, Jooung-Dal ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 257~262
A low capacity generator converted to high capacity of 40m3 is designed and developed in order to use the hydroxy gas in the steel manufacturing process. For efficient design, it is increased from 8 electrode tubes to 10 electrode tubes as well as expanding the diameter of cell integument up to two times bigger, which can increase the amount of hydrogen occurrence per a cell significantly. In addition, circulating pump and pipe, heat exchanger of affiliated SUS material have been used in the circulation of electrolysis catalyst, and circulating cooling section and piping design are also developed. The flame trap is designed into all-in-one suitable check valve in the flow rate of 28-35m3/h and its application is possibly applied in work operation. It is found that the efficiency of generator developed is enhanced substantially up to 84%. It is expected that the application in this field can be expanded significantly by this study.
Optimal Design of Tool Horn for Ultrasonic Metal Welding
Jang, Ho-Su ; Park, Woo-Yeol ; Park, Dong-Sam ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 263~267
Ultrasonic metal welding can be used to weld different metals together safely and precisely, without solder, flux and special preparation. Ultrasonic metal welding machine consists of a power supply, a transducer, a booster and a horn. This paper designed the horn needed for Ultrasonic metal welding. The horn has to be designed and manufactured accurately, because measurements such as the shape, length, mass and etc. have effects on the resonant frequency and the vibration mode. The designed horn has the feature of 40,000Hz of nature frequency, and maximizes vibration range in the Tip by resonance in the frequency of ultrasonic wave machine. In this paper, we calculated and analyzed the natural frequency to find the optimal design of the horn that had the amplitude about
by the modal analysis and harmonic analysis using ANSYS. And we analyzed FFT analysis of the manufactured horn.
Development on Tool Holder of Vibration Cutting System for Ultraprecision Machining
Lee, Se-Yun ; Han, Jun-Ahn ; Kim, Ji-Woon ; Gwak, Yong-Kil ; Kang, Dong-Bae ; Ahn, Jung-Wahn ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 268~273
In light guide panels, the PMMA sheet that is used in liquid crystal displays plays an important role in scattering the incident light and requires very fine machining as the sheet is directly related to the optical characteristics of the panels. High speed end milling(HSE) and high speed shaping(HSS) processes that are widely adopted and applied to the precise machining of light incident plane through vibration-assisted HSS for increasing the optical quality by minimizing the above-mentioned problems. The cutting tool and the tool post presented in this paper are designed by the authors to increase the magnitude of the cutting stroke by adopting the resonant frequency without weakening the stiffness and to reduce vibrations during even high speed feeding. The dynamic haracteristics of thecutting tool and the tool post are evaluated through simulation and experiment as well. The results reveal very appropriate dynamic characteristics for vibration-assisted HSS.
The Study on the Application of CNT Particle in High-Precision Magnetic Abrasive Polishing Process
Kwak, Tae-Kyung ; Kwak, Jae-Seob ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 274~279
In this study, new abrasives that were composed of iron powder and carbon nanotube (CNT) particle were attempted to be abrasives for magnetic abrasive polishing. Because the CNT particles itself are very small ones with high hardness and magnetic strength, these properties are effective for magnetic abrasive polishing of nonmagnetic materials. As an experimental result for evaluating the machining characteristics in magnetic abrasive polishing, the CNT particles showed better performance than the conventional abrasives such as Fe and CBN powder.
Damage of Car Body and Passenger at Impact Contact
Han, Moon-Sik ; Cho, Jae-Ung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 280~283
This study investigates the durability of car body and the safety of passenger inside car body in the case of the impact contact at passenger and car body. In case of front impact contact, maximum von Mises equivalent stress and principal stress become 3240.7MPa and 1634MPa respectively at the rear part of car body and the neck of dummy. And maximum total deformation occurred with 14.145mm at the hand of dummy. In case of side impact contact, maximum von Mises equivalent stress and principal stress become 7687.9MPa and 1690.7MPa respectively at the front part of car body and the lap of dummy. And maximum total deformation occurred with 16.414 mm at the foot of dummy. In case of rear impact contact, maximum von Mises equivalent stress and principal stress become 2366.6MPa and 1447MPa respectively at the front part of car body and the neck of dummy. And maximum total deformation occurred with 7.548mm at the rear part of car body. As the maximum von-Mises stress at side impact is shown with more than 700MPa as over two times at front or rear impact the danger of car body is increased. The great possibility of damage is shown at neck and hand of dummy with more than total displacement of 10mm.
A Study on the Fracture Behavior of Tooth Interfacial Layer, DEJ (Dental Enamel Junction)
Mishra, Dhaneshwar ; Yoo, Seung-Hyun ; Jeong, Ung-Rak ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 284~291
Numerical experiments on biological interfacial layer, DEJ by finite element software ABAQUS have been conducted to study its fracture behavior including crack bridging / arresting characteristics in the model. Crack growth simulation has been carried out by numerical tool, XFEM, devoted to study cracks and discontinuities. The fracture toughness of DEJ has been estimated before and after crack bridging. The implications of bridging in numerical study of fracture behavior of DEJ-like biological interface have been discussed. It has been observed that the results provided by the numerical studies without proper accommodation of bridging phenomenon can mislead. This study can be helpful for understanding the DEJ-like biological interface in terms of its fracture toughness, an important material characteristics. This property of the material is an important measure that has to be taken care during design and manufacturing processes.
A Fundamental Study on Magnetic Pulse Forming with Bar Forming Coil
Shim, Ji-Yeon ; Kang, Bong-Yong ; Park, Dong-Hwan ; Kim, Ill-Soo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 292~297
MPF(Magnetic pulse forming) process refers to the high velocity and high strain rate deformation of a low-ductility materials driven by electromagnetic forces that are generated by the rapid discharge current through forming coil. The goal of this study was to find the characteristics of dynamic behavior of workpiece and to find the main design process on MPF using bar forming coil. For these purposes, thin Al5053 sheet were used for the experiment. The measured strain data were analyzed by developed electromagnetic FE-model. The main design parameter is location of coil, electromagnetic force. In case of the bar forming coil, there exists the dead regions where the low electromagnetic force applied on the workpiece.
Structural Analysis on Horizontal CNC Lathe
Lee, Tae-Hong ; Choi, Jin-Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 298~303
Recently, demand on machine tools has been increased because the machine and automobile industry is booming. Therefore, the machine tools need to have a high accuracy and productivity. To build a high precision machine tool and increase its productivity, structural analysis needs to be carried out for vibration and stiffness of the machine tool before its detail design. However, it is the fact that many manufacturers of machine tools depend on their know-how about design experience. Therefore, in this paper, the static and dynamic analysis is carried out for evaluating a horizontal CNC lathe and then, applied to its detail design. It is positive that the analysis can lead to reduction of design time and improvement of the quality of the lathe as its design proceeds.
A Study on Monitoring of the MAP for Non-magnetic Material by AE Signal Analysis
Lee, Sung-Ho ; Kim, Sang-Oh ; Kwak, Jae-Seob ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 304~309
A monitoring system for magnetic abrasive polishing process is necessary to ensure the polishing products the high quality and integrity. Acoustic emission (AE) signal is known to reflect the material removal phenomena in other machining processes. In a case of the magnetic abrasive polishing of non-magnetic materials, application of AE method is very difficult because of lower machining force on the surface of workpiece and the level of AE signal is extremely lower. In this study, AE sensor-based monitoring system is applied to the magnetic abrasive polishing. The relation between the level of the AE RMS and the surface roughness during the magnetic abrasive polishing of magnesium alloy steel is investigated.
The Displacement Minimization of the tool Center Point by the Crossrail Structure Improvement of the Portal Machine
Lee, Myung-Gyu ; Song, Ki-Hyeong ; Choi, Hag-Bong ; Lee, Dong-Yoon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 310~315
General portal machine represents a distinct weak spot concerning their structural behavior because of long protruding structure components, such as saddles and rams. The weak point causes the deformation of the machine tool and consequently rises a severe machining error. The purpose of this study is to improve the structural design of crossrail in order to minimize it's distortion. Tool Center Point (TCP) was chosen as a reference point for evaluating the distortion effect of a crossrail and topological optimization was adopted as a method of structural design improvement. The displacements of TCP according to the machining positions were investigated by structural analyses for both of original crossrail design and the improved one. The comparing results showed that the displacement of TCP could be reduced about 55% maximum.
Development of a Round endmill Type MR Polishing System Using Neodymium Magnets
Hong, Kwang-Pyo ; Shin, Bong-Cheol ; Kim, Dong-Woo ; Cho, Myeong-Woo ; Je, Tae-Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 316~321
Recently, it has been studied machining of micro parts with increasing demands for ultra precision parts. However, many engineering problems have already begun in polishing of optical parts or lens. As a method to overcome such problems, a new technology for the polishing of the target surface is being studied by controlling abrasives using MR fluids which are sensitive to magnetic fields. Since the current MR polishing system uses a big electromagnet, and is difficult to polish micro parts or spherical lens. Therefore, in this study, a round endmill type MR polishing system was developed to polish a three-dimensional structure which has spherical or inclined plane. And then, series of experiments were performed to verify the polishing performance of the developed round endmill type MR polishing system.
Design Optimization of Planar 3-DOF Parallel Manipulator for Alignment of Micro-Components
Lee, Jeong-Jae ; Song, Jun-Yeob ; Lee, Moon-G. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 322~328
This paper presents inverse kinematics and workspace analysis of a planar three degree-of-freedom (DOF) parallel manipulator. Furthermore, optimization problem of the manipulator is presented. The manipulator adopts PRR (Prismatic-Revolute-Revolute) mechanism and the prismatic actuators are fixed to the base. This leads to a reduction of the inertia of the moving links and hence enables it to move with high speed. The actuators are linear electric motors. First, the mechanism based on the geometry of the manipulator is introduced. Second, a workspace analysis is performed. Finally, design optimization is carried out to have large workspace. The proposed approach can be applied to the design optimization of various three DOF parallel manipulators in order to maximize their workspace. The performance of mechanism is improved and satisfies the requirements of workspace to align micro-components.
A Study on Forming Analysis of Overall Stemping Process Apply Shell Element
Jung, Dong-Won ; Kim, Dong-Hong ; Kim, Bong-Chun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 329~334
The characteristic of sheet metal process is the few loss of material during process, the short processing time and the excellent price and strength. The static implicit finite element method is applied effectively to analyze stamping processes from using AutoForm software. The simulation analysis can be applied to the membrane elements and shell elements. Membrane elements can be applied to good efficiency, but lower than the accuracy of shell elements. Therefore, simple drawing process applies membrane element, and spring-back and analysis of stamping process are judged that it is most efficient that apply shell clement. This study, the simulated results for stamping processes are shown and discussed.
Development of Automatic Packing System of One Station for Fasteners(I): Optimization Design of Packing Mechanism
Kim, Yong-Seok ; Jeong, Chan-Se ; Yang, Soon-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 335~341
In this paper, we proposed an automatic packing mechanism of one station concept for fastener objects where the continuous work is performed in a finite space. The proposed packing mechanism is composed of supporting frame, feeding supply, air shower device, clamping/opening device, batch charging device, sealing/cutting device and supply adjusting device. And, these mechanisms have been modularized through mechanical, dynamical, structural and fluid optimized design using the SMO(SimDesigner Motion) analysis module. Also, the virtual prototype was carried out using the 3-D CAD program. The packing process is consisted performed in the order of feeding, clamping, bottom sealing, cutting, opening, object charging, closing and the upper sealing. And the time of these cycles were designed to be completed in 15-20 seconds. This packing mechanism will be created as a prototype in the near future. In addition, it will be applied to the production scenes after going through a field test for the validation of performance.
A Study on the Fiber Laser welding of Ultra-Low Carbon Interstitial Free Steel for Automotive
Oh, Yong-Seok ; Shin, Ho-Jun ; Yang, Yun-Seok ; Hwang, Chan-Youn ; Yoo, Young-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 342~349
The purpose of this paper is to describe experimental results about the butt welding and bead on plate welding of the high power Continuous Wave (CW) Fiber laser for Ultra-low carbon Interstitial Free(IF) steel plate for gear part of car. After being welded of the gear parts by the fiber laser and electron beam Microstructures of melting zone had been mixed acicular, granular bainitic, quasi-polygonal and widmanstatten ferrite because of a radical thermal diffusion after welding, difference of critical volume and grain size. As a result of experiment, when gear parts were welded by the fiber laser and electron beam, the fiber laser welding has been stable properties without internal defects more than the electron beam welding. Therefore it has the very advantages of welding high quality and productivity more than conventional melting method. The optimal welding processing parameters for gear parts were as follows : the laser power and welding speed were 3kWatt, 30mm/sec respectively. At this time heat input was
A Study on the Design of the Automatic Cutting Mechanism of the Perforation Pipes in an Automobile Muffler
Kim, Yong-Seok ; Jeong, Chan-Se ; Yang, Soon-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 350~356
In this paper, we proposed the automatic cutting mechanism of the perforation pipes in an automobile muffler. This cutting mechanism makes continuous work possible, because it performs the batch work via the sequential operation of loading, feeding, cutting, and discharging. The proposed cutting mechanism consists of the frame unit, escape unit, turning unit, feeding unit, vision system, clamping unit, spindle/cutting unit and cooling unit. And, these mechanisms have been modularized through mechanical, dynamical and structural optimized design using the SMO (SimDesigner Motion) analysis module. Also, the virtual prototype was carried out using the 3-D CAD program. The cutting process cycle is performed in the order of loading, vision processing, feeding, clamping, cutting and discharging. And the cycle time for cutting one piece was designed to be completed in four seconds.
A Study on the Z axis Defection Compensation of the Cross rail for Gantry type Machine tools
Lee, Min-Ki ; Park, Jin-Joo ; Lee, Eung-Suk ; Kim, Nam-Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 357~360
Machine tools of Gantry type have been performing machine work as a moving machinery. In a large machine tools, the machinery is moving with bed and it is structurally unstable. When the objects are processed, machine tools gets loads in the direction of Z-axis. In other words, the machine tools which become bigger was performed by the trend of complexation. It made that the increased machine weight can't be passed over. In order to enhance manufacturing precision, it needs to compensate Z-axis deflection of weight for machine tools. In this paper, Machine tools of Gantry type were miniaturized and deflection was measured by LVDT sensors. When deflection was measured, block mass weighted 50kg is moving on particular distance. Then, the displacement of fixed point and moving point is measured by recording telemeter.
A Study on the Optimal Design for Optical Efficiency of LED
Song, Young-Jae ; Hong, Min-Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 20, issue 3, 2011, Pages 361~367
In this paper, it was attempted to analyze the optimal design of light emitting diode (LED), a source of back light unit (BLU). LED is beginning with commercialized red LED which is made by GaAsP compound semiconductor, and has been developed focusing on liquid crystal panel. In order to get the optimal design, optical simulation was made by analyzing luminosity shape, reflector angle, chip depth, and chip position of LED lighting. Final results show that the proposed LED characteristics were useful to increase light efficiency and it has been proven by distribution chart for actual exposed light on the light guide panel (LGP).