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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 19, Issue 6 - Dec 2010
Volume 19, Issue 5 - Oct 2010
Volume 19, Issue 4 - Aug 2010
Volume 19, Issue 3 - Jun 2010
Volume 19, Issue 2 - Apr 2010
Volume 19, Issue 1 - Feb 2010
Selecting the target year
리니어 직류모터의 성능 평가
Kim, Jung-Cheon ; Lee, Se-Heun ; Kim, Seong-Jun ; Kim, Seung-Hyeon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 5~10
인덱스 테이블의 기술 추세와 설계에 관한 고찰
Kim, Jae-Sil ; Choe, Ji-Hwan ; Kim, Jae-Ung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 11~16
산업용 서보모터의 기술동향 및 설계 요소
Choe, Cheol ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 17~26
Simulation of Thermal Fatigue Life Prediction of Flip Chip with Lead-free Solder Joints by Variation in Bump Pitch and Underfill
Kim, Seong-Keol ; Kim, Joo-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 157~162
This paper describes the thermal fatigue life prediction models for 95.5Sn-4.0Ag-0.5Cu solder joints of Flip chip package considering Under Bump Metallurgy(UBM). A 3D Finite element slice model was used to simulate the viscoplastic behavior of the solder. For two types of solder bump pitches, simulations were analyzed and the effects of underfill packages were studied. Consequently, it was found out that solder joints with underfill had much better fatigue life than solder joints without underfill, and solder joints with
bump pitch had a longer thermal fatigue life than solder joints with
bump pitch. Through the simulations, flip chip with lead-free solder joints should be designed with underfill and a longer bump pitch.
A Study of Nd:YAG Laser Welding in Cold-reduced Carbon Steel and Stainless Steel Sheet
Lee, Chul-Ku ; Lee, Woo-Ram ; Baek, Un-Hak ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 163~170
We have studied on welding dissimilar materials of cold-reduced carbon steel sheet and stainless steel sheet together by using laser beam. It is well known that stainless steel is so strong againt rust and heat, while cold-reduced carbon steel is widely used in various parts of industry. In this research we have performed some experiments to know the possibility of welding dissimilar materials using laser beam by adjusting the power output of 3kW laser. Other conditions of the experiments were as follows : the welding speed was varied in the range between 2m/min and 7m/min, argon gas and helium gas were used as shield gas, the flow value of shield gas was ranged between
, and the gap of two materials was ranged between 0mm and 0.3mm. In order to ascertain of the welded surface, we have done the tensile strength testing, the hardness testing and the microscope observation. As a result, we have found that tensile strength was the highest at the condition of the welding speed of 4, the flow value of
, the gap of two materials 0, and the use of helium gas. Above testings have also showed that the tensile strength was generally satisfactory since the penetration of welding was almost complete due to the thinness of the materials. In addition, the formation of the welded area was excellent when it had the highest tensile strength.
Development of a New 6-DOF Parallel-type Motion Simulator
Kim, Han-Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 171~177
This paper presents the development of a new 6-DOF parallel-kinematic motion simulator. The moving platform is connected to the fixed base by six P-S-U (Prismatic-Spherical-Universal) serial chains. Comparing with the well-known Gough-Stewart platform-type motion simulator, it uses commercialized linear actuators mounted at the fixed base whereas a 6-UPS manipulator uses telescopic linear ones. Therefore, the proposed motion simulator has the advantages of easier fabrication and lower inertia over a 6-UPS counterpart. Furthermore, since most forces acting along the legs are transmitted to the structure of linear actuators, smaller actuation forces are required. The inverse position and Jacobian matrix are analyzed. In order to further increase workspace, inclined arrangement of universal joints is introduced. The optimal design considering workspace and force transmission capability has been performed. The prototype motion simulator and PC-based real-time controller have been developed. Finally, position control experiment on the prototype has been performed.
Finite Element Analysis and Geometric Parameter Optimization for BMT Driving Assembly
Park, Young-Whan ; Kwak, Jae-Seob ; Jiating, Yan ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 178~183
Base-mounted type(BMT) driving assembly in CNC machine tools is an indispensable part to improve productivity by reducing tool changeover time and to meet the ever-increasing demand of precision machine tools. This study aimed to perform finite element analysis and geometric parameter optimization to improve the efficiency of BMT driving assembly. First, simulations for three-dimensional structural and vibration analysis were performed using ANSYS/Workbench on the initial geometric models of BMT driving assembly. After analyzing stress and deformation concentration zones, several new geometrical models were designed and evaluated by design of experiments and ANSYS/DesignXplorer. Through a series of analysis-evaluation-modification cycles, it was seen that designed models were effective in determining optimal geometry of BMT driving assembly.
Analysis of Material Removal Rate of Glass in MR Polishing Using Multiple Regression Design
Kim, Dong-Woo ; Lee, Jung-Won ; Cho, Myeong-Woo ; Shin, Young-Jae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 184~190
Recently, the polishing process using magnetorheological fluids(MR fluids) has been focused as a new ultra-precision polishing technology for micro and optical parts such as aspheric lenses, etc. This method uses MR fluid as a polishing media which contains required micro abrasives. In the MR polishing process, the surface roughness and material removal rate of a workpiece are affected by the process parameters, such as the properties of used nonmagnetic abrasives(particle material, size, aspect ratio and density, etc.), rotating wheel speed, imposed magnetic flux density and feed rate, etc. The objective of this research is to predict MRR according to the polishing conditions based on the multiple regression analysis. Three polishing parameters such as wheel speed, feed rates and current value were optimized. For experimental works, an orthogonal array L27(313) was used based on DOE(Design of Experiments), and ANOVA(Analysis of Variance) was carried out. Finally, it was possible to recognize that the sequence of the factors affecting MRR correspond to feed rate, current and wheel speed, and to determine a combination of optimal polishing conditions.
Analysis of mass and location of proportional damping system using the change of eigenvectors
Lee, Jung-Youn ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 191~197
In spite of a large amount of previous research, detail study on modified mass in proportional damping system is not well understood. It is common to predict structural dynamic design parameters due to the change of mass, but to predict the amount of modified mass and the location where the mass is being modified are rarely found in previous literature. Such inverse problem required detail analytical study in order to understand structural modification in proportional damping system. This paper predicts the modified mass and the modified mass location in proportional damping system using sensitivity coefficients and iterative method. The sensitivity coefficients are obtained from the change of eigenvectors due to mass modification. This method is applied to a horizontal beam and three degree of freedoms system. To validate the predicted changing mass and its location, the obtained results are compared to the reanalysis result which shows good agreement.
Mode Characteristics Analysis of the SH-EMAT Waves for Evaluating the Thickness Reduction
Park, I.K. ; Kim, Y.K. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 198~203
In this paper, study on the mode characteristics analysis of the SH-EMAT (shear horizontal, electromagnetic acoustic transducer) waves for evaluating the thickness reduction in plates such as corrosion and friction is presented. Noncontact methods for ultrasonic wave generation and detection have been a great concern and highly demanded due to their capability of wave generation and reception on surface of high temperature or on rough surface. Mode identification of the SH-EMAT wave is carried out in an aluminum plate with thinning defects using time frequency analysis method such as wavelet transform, compared with theoretically calculated group velocity dispersion curve. The changes of various wave features such as the amplitude and the time-of-flight have been observed and the correlations with the thickness reduction have been investigated. Firstly, experiments have been conducted to confirm that it is possible to selectively generate and receive specific desired SH modes. These modes have then been analyzed to select the parameters that are sensitive to the thickness change. The results show that the mode cutoff and the time-of-flight changes are feasible as key parameters to evaluate the thickness reduction.
A Study on Flow Rate Characteristics of a
Type Differential Pressure Flow Meter with a Shape Improvement
Oh, Dae-San ; Lee, Choong-Hoon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 204~210
The inner structure of the triangular separate bar (TSB) was improved to enhance the productivity of the TSB flow meter by simplifying the machining process for making the flow meter. The cross section of upstream and downstream pressure chamber in the TSB was changed from triangle to circle, which make it possible to substitute the wire cutting by drilling in the process of machining the pressure chamber. The flow rate characteristics of the flow meters was calibrated with a laminar flow meter. Six kinds of flow meters whose diameters of pressure tap for measuring pressure of both upsteam and downstream pressure chamber were different one another were made. The effects of the pressure tap diameter on the flow rate characteristics of the TSB flow meter was little. The mass flow rate characteristics of the flow meters with increasing a non-dimensional parameter which includes the gas temperature, exhaust gas pressure and differential pressure at the flow meters and atmospheric pressure shows nearly linear relationship with a correlation coefficient of R=0.998.
Structural and Thermal Analysis of Disk Brake
Cho, Jae-Uug ; Han, Moon-Sik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 211~215
Continuous contraction and expansion of disk brake can be due to friction and temperature difference at repeated sudden braking. As serious vibration at disk is produced, the braking force will be changed ununiformly and braking system can not be stabilized. Temperature and heat flux at disk brake are investigated by structural and thermal analysis in this study. The maximum equivalent stress and displacement are shown respectively at the ventilated hole and the lower part of disk plate. At thermal analysis of initial state, temperature on disk plate is distributed from
. The maximum heat flux of
is shown at the inner friction part between disk plate and pad. At thermal analysis of transient state, temperature on disk plate is distributed from
after 100 second. The maximum heat flux of
is also shown at the inner friction part between disk plate and pad. By comparing with initial state, the temperature on disk plate is more uniformly distributed and heat flux is more decreased by 7 times at transient state.
Characteristics of Strengthening for Thin Metals by Laser Beam
Yang, Se-Young ; Choi, Seong-Dae ; Kim, Gi-Man ; Jun, Jea-Mok ; Gong, Byeong-Chae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 216~223
The general way to process the surface by means of the laser was heat treatment for strengthening the surface hardness. They have used the laser for changing the property of the surface, especially for metal. Generally, it is recent increasing tendency to use the thin plate panel for making things smaller and lightweight. However, thin plate should be strengthened or let the thin plate panel have moment of inertia by means of engraving the groove or wave on them for lightweight and strengthening. Therefore it is expected that the thin plate panel can be harder and more stable through processing the metal surface by laser beam irradiation and the hardness of thin plate possibly can be also changed how many parts of them are harden. Through this research, it can be grasped how the hardness and mechanical characteristic changes according to width and depth of groove by laser affect the max stress by the ratio of
(hardening area/total area) and characteristic of displacement and structural characteristic for making the thin plate harder by the strengthening metal surface of thin plate by laser through the experiment and analysis of FEA can be presented.
Structural Optimization using Reliability Analysis
Park, Jae-Yong ; Lim, Min-Kyu ; Oh, Young-Kyu ; Park, Jae-Yong ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 224~229
This paper presents a reliability-based topology optimization (RBTO) using bi-directional evolutionary structural optimization (BESO). An actual design involves uncertain conditions such as material property, operational load and dimensional variation. Deterministic topology optimization (DTO) is obtained without considering of uncertainties related to the uncertainty parameters. However, the RBTO can consider the uncertainty variables because it has the probabilistic constraints. In this paper, the reliability index approach (RIA) is adopted to evaluate the probabilistic constraint. RBTO based on BESO starting from various design domains produces a similar optimal topology each other. Numerical examples are presented to compare the DTO with the RBTO.
A Study on the Characteristics of Mixed Combustion for Hydrox Gas
Kim, Hong-Gun ; Kwac, Lee-Ku ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 230~234
Hydrox gas which is the mixed gas of hydrogen and oxygen gained fromwater electrolysis is one of the new clean energy sources and thus is researched and commercialized actively. Especially, it can be replaced the fossil energy and shows the better quality compared to the conventional energy such as LPG or acetylene gas. The mixed gas of hydrogen and oxygen is gained from water electrolysis reaction. It has constant volume ratio 2:1 of hydrogen and oxygen, and it is used as a source of thermal energy by combustion reaction. Further, hydrox gas is nearly a mixed ideal gas combusting itself completely and its combustion shows anunique characteristics of implosion. In this study, temperature rise effects on hydrox gas content through mixed combustion test of kerosene and hydrox gas and LPG and hydrox gas are investigated. it is also confirmed that economy of mixed combustion of hydrox gas as effective energy is fairly probable.
Impact Collapse Behavior of Hybrid Circular Thin-walled Member by Stacking Condition
Lee, Kil-Sung ; Park, Eu-Ddeum ; Yang, In-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 235~240
The recent trend of vehicle design aims at crash safety and environmentally-friendly aspect. For the crash safety aspect, energy absorbing members should be absorbed with collision energy sufficiently. But vehicle structure must be light weight for the environmentally-friendly aspect, in order to improve fuel efficiency and to reduce tail gas emission. Therefore, the light weight of vehicle must be achieved in a status of securing safety of crash. An aluminum or CFRP (Carbon Fiber Reinforced Plastics) is representative one among the light-weight materials. In this study, impact collapse behavior of circular hybrid thin-walled member is evaluated. The hybrid members are manufactured by wrapping CFRP prepreg sheets outside the aluminum circular members in the autoclave. Because the CFRP is an anisotropic material whose mechanical properties change with its stacking condition, special attention is given to the effects of the stacking condition on the collapse behavior evaluation of the hybrid thin-walled member. Collapse mode and energy absorption capability of the hybrid thin-walled member are analyzed with change of the fiber orientation angle and interface number.
Robust Position Control for PMLSM Using Friction Parameter Observer and Adaptive Recurrent Fuzzy Neural Network
Han, Seong-Ik ; Rye, Dae-Yeon ; Kim, Sae-Han ; Lee, Kwon-Soon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 241~250
A recurrent adaptive model-free intelligent control with a friction estimation law is proposed to enhance the positioning performance of the mover in PMLSM system. For the PMLSM with nonlinear friction and uncertainty, an adaptive recurrent fuzzy neural network(ARFNN) and compensated control law in
performance criterion are designed to mimic a perfect control law and compensate the approximated error between ideal controller and ARFNN. Combined with friction observer to estimate nonlinear friction parameters of the LuGre model, on-line adaptive laws of the controller and observer are derived based on the Lyapunov stability criterion. To analyze the effectiveness our control scheme, some simulations for the PMLSM with nonlinear friction and uncertainty were executed.
A Study on Machining of Uncut Volume at the Boundary Region of Curved Surfaces
Maeng, Hee-Young ; Yim, Choong-Hyuk ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 251~259
It is presented in this study a new efficient intelligent machining strategy, which can be used to remove the uncut volume at the boundary region of curved surfaces caused by cutter interference. The geometric form definitions and recognition of topological features of the surface triangulation mesh are used to generate cutter paths along successive and interconnected steepest pathways, that minimize the cusp height left after flat end milling. In order to machine the uncut volume gradually, the z-map cutter centers are adjusted to avoid cutter interference for the 6 kinds of avoidance types. And then, the generative subsequent paths are sequenced to determine the second step cutter paths for the next uncut volume. For the 2 kinds of test models with convex and concave surface region, the implemented software algorithm is evaluated by investigating the residual swelling of uncut volume for each machining step.
A Study on Instrument Panel Welding by Ultrasonic-Waves for Automotive Interior Applied Emotional Design
Lee, Jung-Hyun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 260~266
Today's consumers are looking for emotional design which can fulfill their own potential desire. Emotion varies according to individual circumstance, age, sex, culture, education, profession and so on. Automotive instrument panel design is the most important part of interior design, because it affects the impression of interior design and has the equipments for safety, entertainment and various information. Thus, this study was performed to apply emotional design to automotive instrument panel which is the most important part of automotive interior, and find the best bonding conditions to build instrument panel efficiently by comparing mechanical properties in thermoplastic resin of polyethylene (PE) adhesion. Satisfactory adhesion was executed in ultrasonic welding for the same materials of PE. The best welding conditions were found to be welding time of I second, welding pressure of 250 kPA for PE-PE welding. Dissimilar materials were adhered when adhesion and ultrasonic welding were performed at the same time.
Mirrorlike Machining of SUS304 by Combined process of EP and MR Polishing
Kim, Dong-Woo ; Hong, Kwang-Pyo ; Cho, Myeong-Woo ; Lee, Eun-Sang ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 267~274
Recently, the magnetorheological (MR) polishing process has been examined as a new ultra-precision polishing technology for mirror surface generation in many applications, such as aspheric lenses, biochips, micro parts, etc. This method uses MR fluids which contains micro abrasives as a polishing media, and can. It is possible to obtain nano level surface roughness under suitable process conditions, however, required polishing time is highly dependent on the applied pre-polishing methods due to its very small material removal rate. Thus, in this study, a combined polishing method is presented to reduce total polishing time for SUS304. First, the electropolishing (EP) method was applied to obtain fine surface roughness, and the MR polishing was followed. Surface roughness variations were investigated according to the process conditions. As the results of this study, it was possible to reduce total polishing time for SUS304 using the proposed combined polishing method.
An Research on Ultra Precisive Polishing Manufacturing Technology of Glass for Micromini and Super Wide-Angle Aspherics Glasses Lens.
Kim, Doo-Jin ; Yoo, Kyung-Sun ; Hyun, Dong-Hoon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 275~281
This research's goal is to process directly aspherics with big sagment and thin center thickness. If we can process directly aspherics with big sagment and thin center thickness, we think it greatly helps to reduce the time of developing optical system. We made very thin glass using diamond grinding whetstone regarding the trace of tool and the detailed drawing of tool super precisive aspherics that has 0.46mm center thickness and over
machining accuracy, 15nm surface accuracy. We think this research's result will be effective to open new market because it is applied not only cell phone optical system but also CCTV robot optical system, internet phone optical system. Also we expect to enhance the super strong brittle precisive process's possibility with super precisive processing technique that achieves 0.46mm glass center thickness as first in the world.
Establishment of Conditions for Ultrasonic Welding of Cu sheet
Seo, Jeong-Seok ; Park, Dong-Sam ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 282~287
This paper gives a description of an experimental study of the ultrasonic welding of metals. In ultrasonic metal welding, high frequency vibrations are combined with pressure to join two materials together quickly and securely, without producing significant amount of heat. Ultrasonic metal welder consists of Transducer, Booster, and horn that are designed very accurately to get the natural frequencies and vibration mode. In this study, The horn was designed and analyzed the natural frequency by the modal analysis and harmonic analysis. And using a fiber optic sensor, we measured the amplitude and analyzed the Fast Fourier Transformed result. Using the horn, Ultrasonic metal welding between Cu sheet and Cu sheet of 0.1mm thickness was accomplished under the optimal conditions of static pressure 0.15MPa, vibration amplitude 30% and welding time of 0.28s. This result can be used for ultrasonic metal welding in manufacturing industry.
Structural Design and Analysis for Small Wind Turbine Blade
Lee, Seung-Pyo ; Kang, Ki-Weon ; Chang, Se-Myong ; Lee, Jang-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 288~294
In recent years, wind energy has been the world's fastest growing source of energy. This paper describes the structural design and analysis of composite blade for 2 kW-level HAWT (horizontal axis wind turbine). The aerodynamic design and force, which are required to design and analyze a composite blade structurally, are calculated through BEMT(blade element momentum theory) implemented in public code PROPID. To obtain the equivalent material properties of filament wound composite blades, the rule-of-mixture is applied using the basic material properties of fiber and matrix, respectively. Lay-up sequence, ply thickness and ply angle are designed to satisfy the loading conditions. Structural analysis by using commercial software ABAQUS is performed to compute the displacement and strength ratio of filament wound composite blades.
Searching Optimal Cutting Condition for Surface Roughness In Turning Operation on Inconel 718 using Taguchi Method
Cha, Jin-Hoon ; Han, Sang-Bo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 295~300
Inconel 718 alloy, widely used as material of aircraft engine, has a good mechanical property in high temperature, strong anti-oxidation characteristics in oxidated current over
, and also is not easily digested in the air containing sulfur, therefore, its usage as mechanical component is expanding rapidly. Even though Inconel alloy 718 is difficult to machine, it requires highly precise processing/machining to sustain its component quality of high accuracy. In this paper, general turning operation conditions arc tested to select the best cutting process condition by measuring surface roughness through implementing experiments with orthogonal array of cutting speed, feeding speed and cutting depth as processing parameters based on the Taguchi method. Optimal turning operation conditions are extracted from the proposed experimental models.
A Study on the Thermal Characteristics of LPG and Hydrox Gas Cutting
Kim, Hong-Gun ; Kwac, Lee-Ku ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 2, 2010, Pages 301~305
Cutting procedures where qualities are determined by various demand factors largely influences shipbuilding productivity. Particularly, defects in cutting shapes and cutting surface results in delay for post shipbuilding stages such as in welding and assemblage lines which could become factors for reduced economic viability of the project. Existing cutting procedures utilize fossil fuels such as propane or ethylene as the main fuel component and these methods applied particularly to ship plate cutting gives relatively slow cutting speed and generates large quantities of harmful and sometimes poisonous polluting fumes of which warrants an urgent need to look for alternative cutting methods. Recent introduction of hydrox gas generated by electrically dissociating water into hydrogen and oxygen components to be utilize as an alternative cutting fuel has resulted not just in visible improvement on cutting quality and speed over the existing methods but it has also been welcomed as an environmentally friendly clean fuel source. This paper has been prepared to serve as the basis for accommodating this environmentally friendly hydrox gas cutting method into actual working environment by observing and recording hydrox gas cutting thermal characteristics.