Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
Editor in Chief :
Volume & Issues
Volume 17, Issue 12 - Dec 2000
Volume 17, Issue 11 - Nov 2000
Volume 17, Issue 10 - Oct 2000
Volume 17, Issue 9 - Sep 2000
Volume 17, Issue 8 - Aug 2000
Volume 17, Issue 7 - Jul 2000
Volume 17, Issue 6 - Jun 2000
Volume 17, Issue 5 - May 2000
Volume 17, Issue 4 - Apr 2000
Volume 17, Issue 3 - Mar 2000
Volume 17, Issue 2 - Feb 2000
Volume 17, Issue 1 - Jan 2000
Selecting the target year
International IMS Program : Its Present and Prospectives
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 7~14
Intelligent Manufacturing Systems (IMS) Program is an industry-driven and government-endorsed initiative which assists and encourages the formation of international research consortia to address technical and other emerging manufacturing challenges in the 21
. The IMS initiative places special emphasis on the establishment of R＆D projects which demonstrate equitable cooperation, including the protection of intellectual property. In this explanatory paper, a brief overview of the IMS Program is described, together with abstracts of some selected projects and a research result of Globeman21 project. The IMS prospective is also given.n.
Research Trend of an International IMS RPD Project
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 15~21
The Intelligent Manufacturing Systems (IMS) Rapid Product Development (RPD) Project is an international partnership formed to build a pre-competitive research and development program that will address the integration of new technologies in manufacturing and provide an infrastructure for industry to cooperate much more closely in the product development cycle. In this explanatory paper, a research trend of the RPD project is briefly presented, together with its background and state-of-the-art, focusing on objectives and target results of its sub-projects which include rapid development of functional parts and tools, validation and reverse engineering, and information logistic system.
Phase (IMS Phase) of the G7 Project "Korea Advanced Manufacturing System"
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 22~28
자동차용 충격흡수기의 튜브 스피닝 공정 해석
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 33~38
In process of tube spinning far shock absorber on vehicles, the selection of feed rate and rounding radius of forming roller and revolution speed of tube and forming roller, forming gap between die and forming roller are very important factors to obtain the optimal process result. In this paper, rigid-plastic FEM and UBET analysis are applied to verify effect of each factors by forming load. We can obtain the optimal conditions to prevent defects during processing.
ER댐퍼의 동특성 해석 및 성능연구
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 39~46
In this paper, the analysis of dynamic characteristics and performance investigation of the ER damper are investigated. The ER damper is based on a double rod actuator and an electric field are applied to the moving electrode composed of cylinder and piston. The performance of the ER damper is length of piston electrode field and its velocities. The experimental and calculated results show that the characteristic of the ER damper varies with the magnitude of the electric field.
PC 기반의 다이싱 공정 자동화 시스템 개발
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 47~57
In this study, PC-based dicing machine and driving software were constructed for the purpose of automation of wafer cutting process. To automate the machine, hard automation including vision, loading, and software were considered in the development. Auto loading device and vision system were adopted for the increase of productivity, GUI software programmed for the expedient operation. The dicing machine is operated by the control algorithm and some parameters. It is verified that this kind of PC based automation has a great potential compared with the conventional dicing machine when applied to manufacturing some kinds of wafers as a test purpose.
전자총 히터(electron gun heater) 자동검사를 위한 머신비젼 알고리즘
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 58~67
Electron gun heaters are used to heat a cathode in video(TV) monitors. Major defects of the electron gun heaters include dimensional inaccuracy and pollution with dirty materials. In this paper, to save the labor and time being taken to inspect the heaters, a machine vision system is considered. For the system, a new algorithm is developed to measure the 9 different dimensions of each heater and to detect polluted defects. The algorithm consists of three stages. In the first stage, the center of the heater image is obtained and then its boundary detection is performed. For the efficient boundary detection, a mask called the sum mask is used. In the second stage of the algorithm, a set of fiducial points are determined on the boundary image. Finally, using the fiducial points specified dimensions are measured and the amount of polluted area is computed in the third stage. The performance of the algorithm is evaluated for a set of real specimens. The results indicate that measurements obtained by the algorithm satisfy the tolerance limits fur most of the dimensions and the algorithm detects the polluted defects successfully
유연한 로봇암의 강건진동제어
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 68~75
The flexibility of a manipulator inevitably yields vibration at the end effector. In this work, position and vibration control for a flexible robot arm was studied using a separate voice coil type actuator to raise the accuracy and speed of end tip. A flexible robot arm with a tip mass is modeled as an Euler-Bernoulli beam. An $H_
$ controller is adapted to get a robust control against unmodeled higher-order mode vibration, output sensor noise, and etc. Simulations and experiments show that the modeling of the system is acceptable and robust vibration control is also achieved.
구속 받는 유연 매니퓨레이터의 병렬 위치/힘 제어
Kim, Jin-Soo ; Uchiyama, Masaru ;
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 76~82
정적 보행모델에 기반을 둔 4족 보행로봇의 온라인 틸팅 제어알고리즘
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 83~91
During static walking of a quadruped walking robot, stability of the robot depends on whether the projection of the mass center is located within the supporting area that is varying with leg motion and formed by standing legs. In this paper, force margin instead of the mass center was used to determine stability and body-tilting method was used to enhance it. On-line control of body tilting was realized with simple reaction feedback based on force margin of the static walking model of the robot instead of complicated calculation. Model reference on-line control where the model searches stable pose for predefined force margin also gave good walking performance.
신경망을 이용한 차동조향 이동로봇의 추적제어
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 90~101
In this paper, we propose a controller for differentially steered wheeled mobile robots. The controller uses input-output linearization algorithm and artificial neural network to stabilize the dynamic model and compensate uncertainties. The proposed neural network part has 6 inputs, 1 hidden layer, 2 torque outputs and features fast online learning and good performance on structure error learning basis. Simulation results show that the proposed controller perform precisely tracking of reference path and is robust to uncertainties.
Development of Automated forging Design System for Forging Process Design of Stepped Asymmetric Parts
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 102~107
This study describes computer-aided design system for stepped asymmetric forgings. To establish the appropriate process sequence, an integrated approach based on a rule-base system was accomplished. This system has four modules, which are undercut prevention module, shape cognition module, 3D modelling module and corner/fillet correction module. These modules can be used independently or at all. The proposed shape cognition method could be widely used in forging design of asymmetric parts.
Effects of Previous History on Diffusivity and Solubility of Gas in the Polymer Matrix
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 108~113
An important process for making a new class of polymeric material is called microcellular plastics invented at the Massachusetts Institute of Technology. Many researches for microcellular plastics have been done in various ways and fields. But a research for the polymer which has previous history has not been tried yet. In this paper, weight gain of
was measured in a polymer matrix which had previous history and no history. In each case, experimental data for solubility and diffusivity was shown. A model for
solution process in molecular range was made. The conclusion of this paper is that the previous history has an effect on diffusivity but not solubility and the previous history made by
in supercritical state makes diffusivity of
Analysis on Burr Formation in Drilling with New Concept Drill
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 114~121
A new concept drill was developed recently (or increasing accuracy and productivity in drilling operation. The burr formation in drilling causes many problems in deburring operation because burrs are formed inside holes and it is difficult to remove them. Burr formations are observed in drilling operation with a new concept drill and are compared with conventional HSS drill. Several workpieces with different materials are drilled with several cutting conditions, velocity and feed rate. The burr in drilling can be classified into three types according to the location of crack. To observe the burr formation mechanism, the cap which is formed with the new concept drill is observed and measured.
Fabrication of Micro Shapes (or Advanced Materials by ELID Grinding
Qian, Jun ; Ohmori, Hitoshi ; Kim, Gyung-Nyun ; Jeong, Hae-Do ; Kato, Teruko ;
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 122~128
Analysis of Axial Load Characteristics of Air-Dynamic Bearings of Various Curvatures
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 129~135
Air-dynamic bearings are increasingly used in supporting small high-speed rotating bodies. This study investigates the effects of design parameters on the axial stiffness of spiral-grooved air bearings of various curvatures. Design parameters are fundamental clearance, groove depth, and bearing number. The pressure distribution at the clearance between the stator and rotor of the bearing is obtained by solving the Reynolds equation, and the supporting load and the axial linear stiffness are calculated from the pressure distribution. It is found that a larger curvature increases the axial linear stiffness more and that there exist an optimal groove depth for the linear stiffness of the air bearing. It is also found that the linear stiffness has a linear relationship with the bearing number
Automatic Mesh Generation in the General Three-Dimensional Trimmed Surface using Qua
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 136~148
In this work, a general method for the mathematical description of three-dimensional trimmed surface is proposed by introducing the base parametric surface and boundary curves. Since mesh density distribution for the analysis may vary by cases, a grid-based mesh generation algorithm using quadtree is proposed in the present work. For the assurance of connectivity of generated meshes among surfaces, a method for the pre-cleaning of boundary curves has been developed to be used in the automatic generation of the finite elements. In addition, mesh-smoothing algorithm is suggested which can be used in the general trimmed surface. In this algorithm nodes are moved on the original surface by the normal projection in each iterative smoothing procedure.
Wear Analysis of the Ti-N Coated Punch in Piercing According to the Volume of Production
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 149~157
Tool wear in the shearing process such as blanking, piercing and trimming is very important, because it has great effects on the dimensional accuracy, working efficiency and economy. Most of tools in the shearing process have the coated layer at surface fur good wear and corrosion resistance. When the surface of tool is teated, the wear Phenomena of coated surface layer and inner layer may be different. This paper describes a computer modelling technique by the finite element method in order to investigate the wear mechanism and to predict the wear profile of Ti-N coated tool in piercing process according to the volume of Production. Wear coefficients of the coated layer and inner layer are obtained through Pin-on-Disk wear test, respectively. To verify the effectiveness of the suggested technique, the technique is applied to wear analysis in piercing recess of piston pin and simulation results are compared with experimental ones.
Six D.O.F Ultra Fine Stage using Electromagnetic Force Control
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 158~164
In recent year, desire and request fer micro automation are growing rapidly covering the whole range of the industry. This has been caused mainly by request of more accurate manufacturing process due to a higher density of integrated circuits in semiconductor industry. This paper presents a six d.o.f fine motion stage using magnetic levitation technique, which is one of actuating techniques that have the potential for achieving such a micro motion. There is no limit in motion resolution theoretically that the magnetically levitated part over a fixed stator can realize. In addition, it Is possible to manipulate the position and the force of the moving part at the same time. Then, the magnetic levitation technique is chosen into the actuating method. However, we discuss issues of design, kinematics, dynamics, and control of the proposed system. And a few experimental results fur step input are given.
Position Control of a 3 dof Closed-loop Cylinder System Using ER Valve Actuators
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 165~173
This Paper presents the position tracking control of a closed-loop cylinder system using electro-rheological(ER) valve actuators. After manufacturing three sets of cylindrical ER valves on the basis of Bingham model of ER fluid, a 3 dof(degree-of-freedom) closed-loop cylinder system having the heave, roll and pitch motions is constructed. The governing equations of motion are derived using Lagrange's equation and a control model is formulated by considering nonlinear characteristics of the system. Sliding mode controllers are then designed fer these ER valve actuators in order to achieve position tracking control. The effectiveness of trajectory tracking control performance of the proposed cylinder system is demonstrated through computer simulation and experimental implementation of the sliding mode controller.
Prediction of Form Accuracy during Traverse Grinding of Slender Workpiece Using the Cylindrical Prunge Grinding Data
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 174~183
Non-Parallelism the axial direction occurs during grinding process of long slender shafts. The reason for the axial error is due to elastic deformation of the components, accumulation phenomenon of the grinding and wheel wear during the grinding process. The accumulation phenomenon, the size generation mechanism and the wheel wear process during traverse grinding result in complicated process at each step on the wheel surface. The grinding system stiffness obtained from the stiffness of the center on the tailstock and the workpiece varing according to the relative position of the wheel and the workpiece. Further more, the value of wheel wear increases as the grinding process advances. The above mentioned issues make the shape generation process during traverse grinding quite complicated. This research analyzes the shape generation process in the direction of the work spindle. First, the formulation of the grinding system stiffness was conducted and the simulation analysis method of the traverse grinding was established. Also, a measuring system for assessing the dimensinal accuracy of the workpiece has been developed.
Study on Pad Properties as Polishing Result Affecting Factors in Chemical Mechanical Polishing
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 184~191
Properties of pad are investigated to find the relationship between the chemical mechanical polishing(CMP) results, such as material removal rate and within wafer non-uniformity(WIWNU), and its properties. Polishing pressure is considered as important factors to affect the results, so behavior of ordinary polymer is studied to define the polishing result affecting properties of pad. Experimental setup is devised to identify the behavior of pad and several different pads are used in chemical mechanical polishing experiments to verify the correlations between pad properties and polishing results. The results indicate that the viscoelastic properties of pad had relationships with the polishing results, and shows correlation between suggested properties of pad and polishing result.
A Study on the Collapse Characteristics of Hat-Shaped Members with Spot Welding under Axial Compression(I)
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 192~199
The spot-welded automotive side member which has a hat-shaped section and a double hat shaped section has been tested on the axial static(10mm/min) and quasi-static(50mm/min) compressing load. The collapse characteristics of automotive sections have been reviews on shift on shape and in width of the spot-voiding on the flange. On the basis of the results of tests and reviews, the optimum energy absorption capacity of the structure has been studied.
A Study on the Efficiency Analysis of 2K-H Type Planetary Gear Train
Journal of the Korean Society for Precision Engineering, volume 17, issue 3, 2000, Pages 200~207
The analysis of interference and efficiency are important phases in the design of planetary gear train. Because most planetary gear trains contain internal gear called ring gear, interferences between ring gear and planet gear should be analyzed in the step of design and manufacturing. Addendum modification coefficient, pressure angle, speed ratio between ring gear and sun gear are governing factors for interferences. In this paper, the interferences of 2K-H I type planetary gear train based on various planetary gear trains are studied. As that results, the ranges of addendum modification coefficients which would not lead to interferences is analyzed. Based on these ranges, theoretical efficiencies are investigated as 6 configurations of 2K-H I type planetary gear train, which is based on basic efficiency, and optimal addendum modification coefficients which generate the maximum efficiency of planetary gear train are presented. To prove results of theoretical efficiency analysis, experimentations are performed.