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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 18, Issue 6 - Dec 2009
Volume 18, Issue 5 - Oct 2009
Volume 18, Issue 4 - Aug 2009
Volume 18, Issue 3 - Jun 2009
Selecting the target year
나노/마이크로 시스템 및 공정기술의 연구개발 동향 분석
Jeon, Eun-Chae ; Yun, Jae-Seong ; Jeong, Jun-Ho ; Choe, Du-Seon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 7~25
Collapse Characteristics of CFRP Hat Shaped members According to Variation of Interface Numbers under the Hygrothermal Environment
Yang, Yong-Jun ; Cha, Cheon-Seok ; Yang, In-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 241~247
It is important to satisfy the requirements and standards for the protections of passengers in a car accident. There are lots of studies on the crushing energy absorption of a structure members in automobiles. We have studied to investigate collapse characteristics and moisture absorption movements of CFRP(Carbon Fiber Reinforced Plastics) hat shaped sectional members when CFRP laminates are under the hygrothermal environment. In particular, the absorbed energy, mean collapse load and deformation mode were analyzed for side members which absorbed most of the collision energy. Variation of CFRP interlaminar numbers is important to increase the energy absorption capability. Therefore we have made a static collapse experiment to research into the difference of absorbed energy and deformation mode between moisture absorbed specimen and non-moisture absorbed.
Crater Wear Volume Calculation and Analysis
Jeong, Jin-Seok ; Cho, Hee-Geun ; Yoon, Moon-Chul ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 248~254
The worn crater wear geometry of coated tools after machining has been configured by using Confocal Laser Scanning Microscopy(CLSM) and the Wavelet-based filtering technique. The CLSM can be well suited to construct the three-dimensional crater wear on the rake surfaces of coated tips. However, The raw heightness data of HEI(height encoded image) acquired by CLSM must be filtered due to the electronic and imaging noise occurring in constructing the crater image. So the Wavelet-based filtering algorithm is necessary to denoise the shape features in a micro scales so as to realize accurate crater wear topography analysis. The crater wear patterns filtered enable us to predict the crater wear shape in order to study the tool wear evolution. The study shows that the technique by combining the CLSM and Wavelet-based filtering is an excellent one to obtain the geometries of worn tool rake surfaces over a wide range of surface resolution in a micro scale.
Residual Vibration Reduction of Precise Positioning Stage Using Virtual-Mode Based Input Shapers
Seo, Yong-Gyu ; Jang, Joon-Won ; Hong, Seong-Wook ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 255~260
This paper presents an experimental result of virtual mode input shaping for positioning stage. Input shaping is liable to increase the rise time of the system, which often degrades the performance of system. The virtual mode input, shaping is an input shaper design method to improve this problem. Experiments are performed with a precise positioning stage with a flexible beam of which natural frequency is adjustable. The experimental results show that the virtual-mode shaper is useful to reduce the rise time as well as the residual vibration of precise positioning stages.
Modeling of Cutting Parameters and Optimal Process Design in Micro End-milling Processes
Lee, Kwang-Jo ; Chung, Sung-Chong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 261~269
Micro end-milling process is applied to fabricate precision mechanical parts cost-effectively. It is a complex and time-consuming job to select optimal process conditions with high productivity and quality. To improve the productivity and quality of precision mechanical parts, micro end-mill wear and cutting force characteristics should be studied carefully. In this paper, high speed machining experiments are studied to construct the optimum process design as well as the mathematical modeling of tool wear and cutting force related to cutting parameters in micro ball end-milling processes. Cutting force and wear characteristics under various cutting conditions are investigated through the condition monitoring system and the design of experiment. In order to construct the cutting database, mathematical models for the flank wear and cutting force gradient are derived from the response surface method. Optimal milling conditions are extracted from the developed experimental models.
A Study on the Effect that Pin Shape on Mechanical Strength in Dissimilar Friction Stir Welding A6061-T6 and A5052-H32
Park, Hee-Sang ; Choi, Won-Doo ; Ko, Jun-Bin ; Lee, Young-Ho ; Shin, Ki-Seok ; Kim, In-Chul ; Choi, Man-Yong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 270~278
Friction stir welding is a relatively new solid state joining process. A6061-T6 and A5052-H32 aluminium alloy has gathered wide acceptance in the fabrication of light weight structures requiring a high strength to weight ratio and good corrosion resistance. This friction stir process uses a non-consumable tool to generate frictional heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, etc., and tool pin profile play a major role in deciding FSP zone formation in A6061-T6 and A5052-H32 aluminium alloy. Three different tool pin profiles have been used to fabricate the dissimilar butt joints. The formation of friction stir processed zone has been analysed macroscopically. Tensile properties of the joints have been evaluated and correlated with the friction stir processed zone formation.
Structural Analysis on the System of Differential Gear
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 279~284
This study investigates the stress at gear by modelling differential gear and using FEM. When gear is driven under power, high equivalent stress of 1596.2MPa is occurred at the stationary shaft. Maximum equivalent stress of 1596.2MPa is also occurred at the bottom and root of tooth and its fatigue life becomes 12.4 as the shortest cycle. As much as it becomes away from the center of gear, the maximum deformation becomes occurred. As exact power is delivered with the precise design of gear, the loss of power energy can be decreased.
A Study on the Productivity Improvement of Thermal Infrared Camera an Optical Lens
Kim, Sung-Yong ; Hyun, Dong-Hun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 285~293
Thermal infrared cameras have been conducted actively in various application areas, such as military, medical service, industries and cars. Because of their characteristic of sensing the radiant heat emitted from subjects in the range of long-wavelength(
), and of materializing a vision system, when general optics materials are used, they don't react to the light in the range of long-wavelength, and can't display their optic functions. Therefore, the materials with the feature of higher refractive index, reacting to the range of long-wavelength, are to be used. The kinds of materials with the characteristic of higher refractive index are limited, and their features are close to those of metals. Because of these metallic features, the existing producing method of optical systems were direct manufacturing method using grinding method or CAD/CAM, which put limit on productivity and made it difficult to properly cope with the increasing demand of markets. GASIR, a material, which can be molded easily, was selected among infrared ray optics materials in this study, and the optical system was designed with two Aspheric lenses. Because the lenses are molded in the environment of high temperature and high pressure, they require a special metallic pattern. The metallic pattern was produced with materials with ultra hardness that can stand high temperature and high pressure. As for the lens mold, GMP(Glass Molding Press) of the linear transfer method was used in order to improve the productivity of optical systems for thermal infrared cameras, which was the goal of this paper.
A Study of Machining Error Due to Tool Deflection in Micro Endmilling
Seo, Tae-Il ; Sohn, Jong-In ; Lee, Hak-Yong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 294~299
Micro end-milling has been becoming an important machining process to manufacture a number of small products such as micro-devices, bio-chips, micro-patterns and so on. Many related researches have given grand effects to micro end-milling phenomenon, for example, micro end-milling mechanism, cutting force modeling and machinability. This paper strongly concerned actual problem, micro tool deflection, which causes excessive machining errors on the workpiece. Machining error were predicted and measured through a series of test micro cutting and analysis of their SEM images and FEM analysis. Experiments are carried out to validate the approaches.
Environments Pollution Caused by Welding Rod in the Process of Pipe Working
Yoon, Young-Mook ; Lee, Woo-Ram ; Lee, Chul-Ku ; Kim, Joo-Han ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 300~306
Welding technology is applicable in many kinds of fields, with the help of its advantages such as easy operational procedure and structural simplification. However, in the process of welding, hazardous materials and fumes cause huge fire broke-outs, explosions, and health-conscious problems. Also, as heavy metals in fumes have a harmful effect on the environment, recently, this has emerged as a urgent social issue. This study has been aimed at the recommendation of the most environment-friendly, among materials currently used in plumbing welding, and it has been done at the result of the analysis of amount, ingredient, and size in collected fumes created in the experiment of welding five rods to galvanized steel pipes and steel pipe ones. At the test result, due to the effect of Zn-coating, galvanized steel pipes, when welded to rods, created more fumes than steel pipe ones. In the mean time, when it comes to welding rods, among five, WR-03 produced fumes the least. Therefore, a combination of the test results clearly indicates that the case of welding WR-03 to cast-iron pipes turned out to be the most environment-friendly.
Development of Roll-to- Flat Thermal Imprinting Equipment and Experimental Study of Large Area Pattern Replication on Polymer Substrate
Lee, Moon-G. ; Lan, Shuhuai ; Lee, Soo-Hun ; Lee, Hye-Jin ; Ni, Jun ; Sung, Yeon-Wook ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 307~314
Large area micro pattern replication has promising application potential in many areas. Rolling imprint process has been demonstrated as one of the most competitive processes for such micro pattern replication, because it has advantages in low cost, high throughput and high efficiency. In this paper, we developed a prototype of roll-to-flat(R2F) thermal imprint system for large area micro pattern replication process, which is one of the key processes in the fabrication of flexible displays. Experimental tests were conducted to evaluate the feasibility of system and the parameters' effect on the process, such as flat mold temperature, loading pressure and rolling speed. 100mm
100mm stainless steel flat mold and commercially available polycarbonate sheets were used for the tests. The experimental results showed that the developed R2F system is suitable for fabrication of various micro devices with micro pattern over large area.
The Roundness Prediction at Numerical Control Machine Using Neural Network
Shin, Kwan-Soo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 315~320
The purpose of this study is to predict the roundness of Numerical Control Machining so that helps the operator to choose the right machining conditions to produce a product within the given error limits. Learning of neural network is Backpropagation theory. From this study, the base was set to setup the database to produce precisely machined product by predicting the rate of error in the fabrication facility which does not have the environment to analyze it.
A Study on the Fixation Characteristics of a Self-expansion Type ACL Fixation Device
Kim, Jong-Dae ; Kim, Hong-Gun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 321~327
This paper studied the influences of the main design parameter-the expansion angle and the material properties of the self-expansion anterior cruciate ligament fixation device on the contact condition with the bone and the initial stability of the device. Using finite element analysis, the stress distributions of the ring part of the device and the wall of the bone tunnel were calculated. And the micro-migration of the device by the pull-out force was calculated. From the analysis results, it was found that when designing the self-expansion type anterior cruciate ligament fixation device, it is desirable to use the material having higher Young's modulus and to design the fixation device that all wedges uniformly maintain contact with bone to obtain initial stability after operation.
A Study on the Durability of a Wedge for Transportation of Rolled Steel Plates Using FEM
Kwac, Lee-Ku ; Kim, Hong-Gun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 3, 2009, Pages 328~335
In order to 1ransport the steel roll coil effectively and safely to the destination, the stability of the steel roll coil which induced the minimum movements during the 1ransportation was s1rongly required. The basic 1ransportation equipment for the steel roll coil such as the wedge is made of 100% imported wood known as the apitong. However, the material characteristic such as the rigidity has caused permanent damages to the steel roll coil and the damaged steel roll coils were not easily restorable. Thus it was unsuitable for other purposes. The introduction of new materials to manufacturing wedges which would have a good recovery performance and thus enable the wedge prevention or reduction to the steel roll coil or any other products during the 1ransportation is needed. Due to the fact that recovering damage of the coil is almost impossible, we have to find the new type of wedge that can substitute the apitong wedge. Therefore, we are going to develop a wedge that does not damage rolled steel coil and has better recovery and softness than existing apitong wedge.