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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
제조업 생산시스템의 변화
Lee, Dong-Gil ; Jeong, Min-Gwan ; Kim, Myung-Ho ; Jang, Gyeong-Cheon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 5~10
제조업 생산시스템의 현재
Lee, Dong-Gil ; Jeong, Min-Gwan ; Kim, Myung-Ho ; Jang, Gyeong-Cheon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 11~18
Lee, Dong-Gil ; Jeong, Min-Gwan ; Kim, Myung-Ho ; Jang, Gyeong-Cheon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 19~23
Development of 3D Measuring System for Artificial Pontic using Spherical Coordinate System Mechanism
Maeng, Hee-Young ; Sung, Bong-Hyun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 427~433
With recent increased demand for reverse engineering in dental machining, the 3D laser scanner is widely used for inspection of artificial pontic. In order to overcome the optical drawback of laser scanner, such as irregular scatter, direction of beam, and the influence of surface integrity, it is developed in this study a new 3D measuring system for artificial pontic using spherical coordinate system mechanism by point laser sensor, which keeps the direction of beam normal to surface consistently. The comprehensive integrated system is established to evaluate the improvement of accuracy with data acquisition system. The experimental results for measuring a master ball and pontic models shows the excellent form accuracy and repeatability compared with conventional apparatus. Also, these results shows the possibility to apply this system for the measuring purpose within 0.05mm accuracy of pontic at the sharp edge or margin contour, which was difficult to measure at the conventional systems.
Topology Optimization of Thermal Actuated Compliant Mechanisms
Lee, Won-Gu ; Im, Min-Gyu ; Park, Jae-Yong ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 434~439
A compliant mechanism is a mechanism that produces its motion by the flexibility of some or all of its members when input force or thermal load is applied. Whereas the topology optimizations based on homogenization and SIMP parameterization have been successfully applied for compliant mechanism design, ESO approach has been hardly considered yet for the optimization of these types of systems. In this paper, traditional ESO method is adopted to achieve the optimum design of a compliant mechanism for thermal load, since AESO method cannot consider the effect of both heat conduction and convection. Sensitivity number, a criterion for element removal in traditional ESO, was newly defined for input thermal loading. The procedure has been tested in numerical applications and compared with the results obtained by other methods to validate these approaches.
TRIZ Problem Definition through Requirements Engineering
Jeong, Jin-Ha ; Park, Young-Won ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 440~448
Recently, there are many corporations, schools and institutes that apply TRIZ to solve technical problems. However, in reality, only a few cases of brainstorming applications exist in utilizing forty principles of TRIZ due to the difficulty at TRIZ problem definition. In order to facilitate TRIZ applications, this study proposes the utilization of requirement definition and description tool of systems engineering in TRIZ problem definition. No requirement definition exists in general problem types that TRIZ approach is used in implementing system solution. At most of problem situations, TRIZ users reversely infer that certain problem belongs to which requirement definition it is and recommends TRIZ tools to be used for the exact problem definition. This study also proposes TRIZ problem definition method by applying the results of requirement definition process. The application of TRIZ is demonstrated to the general situation with no problem definition where the proposed method enables the proper use of TRIZ.
A Study on End-effector Friction of Constrained Spatial Flexible Manipulator
Kim, Jin-Soo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 449~454
The force control of a constrained flexible manipulators has been one of the major research topics. However, a little effort has been devoted for the relation between friction force and elastic deflection of end-effector for a constrained flexible manipulator. So, the aim of this paper is to clarify the friction mechanism of a constrained spatial multi-link flexible manipulator by changing the material and connected method of end-effector. In this study, a concise hybrid position/force control scheme is applied to the control of a flexible manipulator, and the experimental results for the constrained vertical motion and constrained horizontal motion is presented. Finally a comparison between these results are presented to show the reduction of vibration of link and friction force.
Compound Machining of Milling and Magnetic Abrasive Polishing for Free Form Surface
Kwak, Tae-Kyung ; Kim, Sang-Oh ; Kwak, Jae-Seob ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 455~461
Automated magnetic abrasive polishing which can be applied after machining of the mold on a machine tool without unloading is very effective for finishing a complicated injection mold surface. This study aims to realize one step polishing of free form surface with the same machine tool. For this purpose, magnetic flux density according to the change of curvature radii was simulated for selecting polishing conditions and experimental verification was performed with a complicated mold of aluminum alloy. As a result, it was seen by the simulation that the magnetic flux density at a gradual curvature of the mold was higher than at a steep curvature and the higher magnetic flux density produced the better surface roughness in the experimentation. The deviation for the surface roughness of the mold decreased on the whole and the uniform mold surface was obtained after the automated magnetic abrasive polishing.
A Study on a Relationship Between the Surface Roughness of Fracture CT Specimen Broken by Fatigue Crack Growth and the Moments
Kim, Kyun-Suk ; Jung, Hyun-Chul ; Kim, Kyung-Su ; Park, Chan-Joo ; Jang, Hos-Seob ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 462~468
Fatigue crack growth caused by surface defects is one of the most important subjects for the evaluation and the assurance of safety in pressure vessels, piping systems, LPG/LNG fuel tank and other various structures. So, this paper aims to investigate the relationship between the surface roughness of fracture CT specimens and the moments on the specimen when doing fatigue test for the evaluation and the assurance of safety of structures from fatigue crack deconstruction. In this experiment, the CT specimens were loaded by a fatigue testing machine with changing loads until they are broken. The surface roughness of the fracture CT specimens was measured using 3D precise shape measuring equipment and digital holography. As a result of this study, It was identified that the average roughnesses are similar at the positions that has a same moments by comparing the results with the moments on the specimen according to the position.
Reliability-Based Shape Optimization Under the Stress Constraints
Oh, Young-Kyu ; Park, Jae-Yong ; Im, Min-Gyu ; Park, Jae-Yong ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 469~475
The objective of this study is to integrate reliability analysis into shape optimization problem using the evolutionary structural optimization (ESO) in the application example. Reliability-based shape optimization is formulated as volume minimization problem with probabilistic stress constraint under minimization max. von Mises stress and allow stress. Young's modulus, external load and thickness are considered as uncertain variables. In order to compute reliability index, four methods, i.e., reliability index approach (RIA), performance measure approach (PMA), single-loop singlevector (SLSV) and adaptive-loop (ADL), are used. Reliability-based shape optimization design process is conducted to obtain optimal shape satisfying max. von Mises stress and reliability index constraints with the above four methods, and then each result is compared with respect to numerical stability and computing time.
Modeling and Countermeasure for Positioning Stage Base Vibration
Park, Ah-Yeong ; Lim, Jae-Gon ; Hong, Seong-Wook ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 476~484
Precise positioning stages are often employed for precise machinery. For the purpose of vibration isolation, these precise positioning stages are mounted on a heavy base structure which is supported by compliant springs. Then the base structure is subjected to residual vibration due to the reactive force and vertical moving load induced by the stage motion. This paper investigates the vibration behavior of a positioning stage base and the associated vibration suppression technique. A dynamic model is developed to investigate the base vibration due to the reactive force and moving load effects by the moving stage. An input shaping technique is also developed to suppress the residual vibrations in base structures. Simulations and experiments show that the developed dynamic model adequately represents the base vibration and that the proposed input shaping technique effectively removes the residual vibrations from the positioning stage base.
Elasticity Modulus Change Research of Polymer Ultraviolet Dosage by using ESPI
Kim, Kyeong-Suk ; Kim, Dong-Soo ; Chang, Ho-Sub ; Pack, Chan-Joo ; Jang, Wan-Sik ; Jung, Hyun-Chul ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 485~490
Recently, environment problems have effects on the electronic equipments. Security problems are presented. For security reasons, it is necessary to study electronic equipments. In this paper, we handle the Elasticity modulus on the polymer insulator by UV irradiation. The types of material are used in this experiment, is the EPDM (Ethylene Propylene Diene Monomer). For increasing the reliability, real material specimens are used. For this study, we used ESPI (Electronic speckle pattern interferometry), UTM (Universal thesting machine) device, Accelerated weathering tester. Through this measurement, we evaluated how much UV irradiation has effect on polymer insulator and how long does it take to change the polymer insulator. Also this paper will give a help in electronic industry and the method of measuring the insulator elasticity modulus of polymer could be utilized in life estimation and replacement time of the products of electronic equipment that is used in real industrial fields.
Magnetic Polishing Using Ba-Ferrite Magnetic Substance
Yun, Yeo-Kwon ; Kim, Hee-Nam ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 491~497
The magnetic polishing is the useful method to finish some machinery fabrications by using magnetic power. This method is one of the precision techniques and has an aim for clean technology in the clean pipes. The magnetic abrasive polishing method is not so common in the field of machine that it is not known to widely. There are rarely researcher in this field because of non-effectiveness of magnetic abrasive. This paper deals with mediocritizing magnetic polishing device into regular lathe and this experiment was conducted in order to get the best surface roughness at low cost. This paper contains the result of experiment to acquire the best surface roughness, not using the high-cost polishing material in processing. In this paper, We could have investigated into the changes of the movement of magnetic abrasive grain. In reference to this result, we could have made the experiment which is set under the condition of the magnetic flux density, polishing velocity according to the form of magnetic brush.
Tool Deflection Estimation in Micro Flat End-milling Using Finite Element Method
Lim, Jeong-Su ; Cho, Hee-Ju ; Seo, Tae-Il ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 498~503
The main purpose of this study strongly concerned micro machining error estimation by using FEM analysis of tool deflection shapes in micro flat end-milling process. For the precision micro flat end-milling process, analysis of micro cutting errors is mandatory. In general, tool deflection is a major factor which causes cutting error and limits realization of the high-precision cutting process. Especially, in micro end-milling process, micro tool deflection generates very serious problems in contrast to macro tool deflection. Methods which deal with compensation of cutting error by tool deflection in macro end-milling process have been studied plentifully but, few researches transact with micro scaled cutting tool deflection in micro cutting process. Therefore, the trend of micro tool deflection was estimated by using FEM analysis in this paper. Cutting forces were acquired by micro dynamometer and these were utilized in FEM analysis. In order to verify FEM analysis results, micro machining processes were carried out and real machined profiles were compared with FEM results. Finally through the proposed approach well suited FEM results were obtained.
Structural Design and Analysis for the Reinforced Frame of Vehicle
Kang, Sung-Soo ; Cho, Seong-Keun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 504~510
To achieve the structural safety of the vehicle, designs in various cases are carried out by using CATIA program. It is promoted the relaxation of stresses by collisions from the front portion, the side part and the rear portion of the vehicle. In this study, we conduct a variety of design of frames for the light weight frame of the vehicle and structural analysis, to protect the driver by adding reinforced frame. In the case of such a collision, there are maximum stresses greater than yield strength of steel and a very large local plastic deformation at the collision part.
A Study of the Effects on the Structural Strength by Change of Spot Welding Pitch
Hong, Min-Sung ; Kim, Jong-Hyun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 511~520
In general, spot welding is used at no welding rod or flux for the process, low welding point temperature compared to arc welding, short heating time, less damage to the parent material, and low deformation and residual stress, relatively. Also, because of the pressurization effect, better mechanical qualities of the welding parts are obtained. Therefore, in various fields of industry its rapid operation speed can make mass production possible such as motor industry. In FEM analysis for the spot welding process, it is effective to use simple modeling rather than complicated one because of its numerous number of spots and reduction of analysis time. Therefore, this study provides with not only simplification of modeling analysis by using beam component composition of structure without re-compositing the spot welding point mesh but also modeling analysis of which property of fracture strength is reflected. In addition complete spot welding model is examined at rectangular post shape (hat shape) by impact test, compared the results, and verified its validity. As a result, it is possible to optimize the welding position and to recognize the strength of structure and the proposed equal distance model shows the effect of welding point reduction and improvement of stiffness.
Product Quality Index for Concept Design Evaluation
Jeong, Jin-Ha ; Park, Young-Won ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 521~528
A product system will be improved continually until requirements are satisfied. It is true that considering alternative designs to improve product system is hard work; it is also true that selecting an adequate design idea that represents the needs of stakeholders concerned and meets effectiveness factors properly is not an easy work, either. In the process of driv-ing an idea and designing, which is called Design Phase, there are lots of existing tools for testing the driven idea in DFSS. But, those kinds of tools do not offer the function that helps to select the technically better design idea among alternative design ideas that have the same evaluation level. Moreover it is inappropriate to select adequate alternative design ideas by just verifying only the evaluation table in pugh matrix, since satisfied deviation val-ues are low when there is a too competitive mass product system in a market. Also, for the IT product with short life cycle, faster and more effective testing tool is needed. Therefore, the 'roduct quality index' is suggested in order to select an appropriate candidate design concept for system development that meets requirements by using 'deality concept' pro-vided by TRIZ. According to the result of this research, it is possible to select technically better idea fast and effectively; it is confirmed by applying the approach to the case of LCD BLU (Back Light Unit).
Reliability-Based Topology Optimization Based on Bidirectional Evolutionary Structural Optimization
Yu, Jin-Shik ; Kim, Sang-Rak ; Park, Jae-Yong ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 529~538
This paper presents a reliability-based topology optimization (RBTO) based on bidirectional evolutionary structural optimization (BESO). In design of a structure, uncertain conditions such as material property, operational load and dimensional variation should be considered. Deterministic topology optimization (DTO) is performed without considering the uncertainties related to the design variables. However, the RBTO can consider the uncertainty variables because it can deal with the probabilistic constraints. The reliability index approach (RIA) and the performance measure approach (PMA) are adopted to evaluate the probabilistic constraints in this study. In order to apply the BESO to the RBTO, sensitivity number for each element is defined as the change in the reliability index of the structure due to removal of each element. Smoothing scheme is also used to eliminate checkerboard patterns in topology optimization. The limit state indicates the margin of safety between the resistance (constraints) and the load of structures. The limit State function expresses to evaluate reliability index from finite element analysis. Numerical examples are presented to compare each optimal topology obtained from RBTO and DTO each other. It is verified that the RBTO based on BESO can be effectively performed from the results.
Improving the Residual Stress Characteristics of the Metal Surface by Nd:YAG Laser Shock Peening
Yang, Se-Young ; Choi, Seong-Dae ; Jun, Jea-Mok ; Gong, Byeong-Chae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 539~547
Laser shock peening is useful to improve fatigue characteristic of multiple number of metals and alloys. This process induces a compressive residual stress on the metal surface, and when tensile load is applied, growth of crack is delayed and which changes the characteristic of the metal surface. It is an innovative surface treatment technique for strengthening metals. Specimens of SM45C are used in this study. The effect of an inertial tamping layer on the residual stress field using laser shock peening setup and Nd:YAG laser power is evaluated. Residual stress distribution measured by X-ray diffraction. As a result of this study it can be presented that following condition of Nd:YAG laser power and inertial tamping layer parameters, compressive residual stress is generated on the surface of the SM45C. Results to experimental data indicate that laser shock peening has great potential as a means of improving the mechanical performance of the metal surface.
Development of the Quick Exhaust Valve to Blowing the Intake Filter for the Thermal Power Plant
Jeong, C.S. ; Lee, H.U. ; Jeong, Y.M. ; Lee, C.D. ; Yang, S.Y. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 548~552
The air suction filter of the power plant decrease the dust and impurities of suction air that reduce the life and efficiency of the boiler. The suction efficiency of the air filter falls with the dust and impurities when the time of use comes to be long. Therefore, the various contaminant of the filter must remove periodically. This paper presents a developed quick exhaust valve to use in the thermo-electric power plant. to removing contaminants on the filter, the blowing is done shortly by air pressure. The Air flowed out to the out side from the inside of the filter. The performance test of the developed valve is done by making a test-bench according to JIS and KS standards. The efficiency is found higher than the existing related valve.
Design of Linear XY Stage using Planar Configuration and Linear Motors with Halbach Magnet Array
Kim, Ki-Hyun ; Lee, Moon-G. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 553~561
In flat panel display or semiconductor industries, they install the equipments with fine line width and high throughput for fabrication and inspection. The equipments are required to have the linear stage which can position the work-piece with high speed, fine resolution on wide range of motion. In this paper, a precision planar linear XY stage is proposed. The stage has a symmetric planar window configuration and is guided by air-bearings on granite plate. The symmetric planar window configuration makes the stage has robustness against dynamic and thermal disturbances. The air-bearings let the stage move smooth on straight guide bar and flat granite surface. The stage is actuated by linear motor with Halbach magnet array (HMA). HMA generates more confined magnetic flux than conventional array. The linear motors are optimized by using sequential quadratic programming (SQP) with the several constraints that are thermal dissipation, required power, force ripple and so on. The planar linear XY stage with the symmetric planar configuration and the linear motors is implemented and then the performance such as force ripple, resolution and stroke are evaluated.
A Study on the Interpolation Algorithm to Improve the Blurring of Magnified Image
Lee, Jun-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 562~569
This paper analyzes the problems that occurred in the magnification process for a fine input image and investigates a method to improve the blurring of magnified image. This paper applies a curve interpolation algorithm in CAD/CAM for the same test images with the existing image algorithm in order to improve the blurring of magnified image. As a result, the nearest neighbor interpolation, which is the most frequently applied algorithm for the existing image interpolation algorithm, shows that the identification of a magnified image is not possible. Therefore, this study examines an interpolation of gray-level data by applying a low-pass spatial filter and verifies that a bilinear interpolation presents a lack of property that accentuates the boundary of the image where the image is largely changed. The periodic B-spline interpolation algorithm used for curve interpolation in CAD/CAM can remove the blurring but shows a problem of obscuration, and the Ferguson' curve interpolation algorithm shows a more sharpened image than that of the periodic B-spline algorithm. For the future study, hereafter, this study will develop an interpolation algorithm that has an excellent improvement for the boundary of the image and continuous and flexible property by using the NURBS, Ferguson' complex surface, and Bezier surface used in CAD/CAM engineering based on the results of this study.
Development of Welding Index Table for FD Fan Impeller
Jeong, Wan-Bo ; Kim, Jin-Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 570~575
This study is regarding development of an index table for antomation of welding process in impeller fabrication. A PLC, which is widely used for automation in industry, was also adopted as a controller for the index table because of it effectiveness, easy maintenance and repair. The index table consists of centering jig, blade jig, workbench, driving system and a controller. A touch screen was also prepaired as a man-machine interface to provide convenience for workers. Water jacket was installed inside the workbench to reduce thermal stress come from the welding. Temperature of the water jacket was kept constant to cool an impeller main plate effectively. The index table developed in this study convinces that it reduces the total welding time by 50% compared with the conventional process without the table.
A Study on the Centrifuge Fabrication for a Nano Size Particle Having a Central Supply Tube
Hwang, Gyo-Seon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 576~581
As a super high speed small-sized centrifugal separator which is operated by the center inputting method has solved two difficulty problems, it can be made use of developing the new composition through the making of Nano particle (50~100nm) by high speed revolution and alleviation of unbalanced shapes inside the disk continuously throwing slurry in the central part. Uses the air spindle and the centrifugal machine production will be able to manufacture the Roh class fine particle under boil.
Application of Response Surface Method for Optimal Transfer Conditions of MLCC Alignment System
Kim, Jae-Min ; Chung, Won-Ji ; Shin, O-Chul ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 4, 2010, Pages 582~588
This paper presents the Application of Response Surface Method for Optimal Transfer Conditions of MLCC Alignment System. his paper is composed of two parts: (1) Testing performance verification of MLCC alignment system, compared with manual operation; (2) Applying response surface method to figuring out the optimal transfer conditions of MLCC transfer system. Based on the successfully developed MLCC alignment system, the optimal transfer conditions have been explored by using RSM. The simulations using
has been performed according to the cube model of CCD. By using
, we have established the model of response surface based on the simulation results. The optimal conditions resulted from the response optimization tool of
has been verified by being assigned to the prototype of MLCC alignment system.