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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
Editor in Chief :
Volume & Issues
Volume 12, Issue 12 - Dec 1995
Volume 12, Issue 11 - Nov 1995
Volume 12, Issue 10 - Oct 1995
Volume 12, Issue 9 - Sep 1995
Volume 12, Issue 8 - Aug 1995
Volume 12, Issue 7 - Jul 1995
Volume 12, Issue 6 - Jun 1995
Volume 12, Issue 5 - May 1995
Volume 12, Issue 4 - Apr 1995
Volume 12, Issue 3 - Mar 1995
Volume 12, Issue 2 - Feb 1995
Volume 12, Issue 1 - Jan 1995
Selecting the target year
Machine Tool Technology;The Present And The Future(7)
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 5~17
Developmetn of Integrated Monitoring System for Composition of CIM System's infrastructure(DLU & DAU) (l)
Kang, H.W. ; Lee, W. ; Kim, S.B. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 18~24
This paper describes a multi-computer system developed for CIM(Computer Integrated Manufacturing) system, which combines single board computers and personal computers by using RS422/485 communication and LAN. The system adopts a concept of hot run back up system based on dual CUP system of host and supervisor structure. The dual CPU system and the single board computer are respectively developed using 32 bits microcomputer and 16 bits microprocessor. 8097BH. The multi communication between two types of system is done by using RS 422/485, and also data logging computers are linked with LAN.
Development of a Direct Drive Scara Robot Manipulator and PC-Based Preliminary Force/Motion Control
Kim, D.H. ; Park, D.Y. ; Park, H.S. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 25~31
In this paper, a direct drive scalar robot manipulator is constructed and its mechanical machanism for operation is explained. Also, a motion controller board for the direct drive robot manipulator was developed where the IBM 486 computer is the main controller. For the developed direct drive robot, a force/motion control algorithm based on an active compliance scheme is developed. A preliminary experiment using the developed direct drive for a peg-in-hole job was done by implementing the control algorithm.
A Knowledge-based CAD System for product and Mold Design in Injection Molding
Y.J. Huh ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 32~39
The design of injection molded polymeric parts has been done empirically, since it requires profound knowledge about the moldability and causal effects on the properties of the part, which are not available to designers through current CAD systems. An interactive computer-based design system is developed in order to realize the concept of rational design for the productivity and quality of mold making. The knowledge-based CAD system is constructed by adding the knowledge -base module for mold feature synthesis and appropriate CAE programs for mold design analysis in order to provide designers, at the initial design stage, with comprehensive process knowledge for feature synthesis, performance analysis and feature-based geometric modeling. A knowledge-based CAD system is a new tool which enables the concurrent design with integrated and balanced design decisions at the initial design stage of injection molding.
A Study on the Strain Measurement of Structure object by Electronic Process and Laser Interferometry
Jung, W.K. ; Kim, K.S. ; Yang, S.P. ; Jung, H.C. ; Kim, J.H. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 40~49
This paper presents the performance and problems in analysis method and testing system of Electronic Speckle Pattern Interferometry (ESPI) method, in measuring two - dimensional in-plane displacement. The anyalysis result of measurement by ESPE is quite comparable to that tof measurement by strain gauge method. This implies that the method of ESPE is a very effective tool in non-contact two-dimensional in-plane strain analysis. But there is a controversal point, measurment error. This error is discussed to be affected not by ESPE method itself, but by its analysis scheme of the interference fringe, where the first-order interpolation has been applied to the points of strain measured. In this case, it is turned out that the more errors would be occurred in the large interval of fringe. And so this paper describes a computer method for drawing when the height is available only for some arbitrary collection of points. The method is based on a distance-weighted, last- squares approximation technique with the weight varying with the distance of the data points.
Real-time Multi-sensing System for In-process monitoring of Chatter Vibration(l)
Kim, J.S. ; M.C. Kang ; Park, C. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 50~56
Chatter Vibration is an unwanted phenomenon in metal cutting and it always affects surface finish, tool life, machine life and the productivity of machining process. The real-time detection of the chatter vibration is is necessarily required to automation system. In this study, we constructed the multi-sensing system using Tool Dynamometer, Accelermeter and AE sensor. Especially, Acoustic Emission(AE) generated during turning was investigated the possibility for real-time detection of chatter vibration. Turning experiments were performed using carbide insert tip under realistic cutting conditions and tapered workpiece of SM45C. Consquently, the real-time detection using multi-sensing system can be used for Inprocess monitoring of chatter vibration.
A Study on the Process Design of Non-Axisymmetric Forging Components
Kim, Y.H. ; Bae, W.B. ; Park, J.H. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 57~68
An upper bound elemental technique (UBET) program has been developed to predict forging load, die-cavity filling, preform in non-axisymmetric forging. To analyze the process easily, it is suggested that the deformation is divided into two different parts. Those are axisymmetric part in corner, plane-strain part in lateral. The plane-strain and axisymmetric parts are combined by building block method. And the total energy is computed through combination of three deformation parts. A dumbbell-type preform has been obtained from height and volumetric compensations of the billet based on the backward simulation. Experimetns have been carried out with pure plasticine at room temperature. Theoretical predictions are in good agreement with expereimental results.
Measurement of Vibration of Rotating Disk Cam Using He-Ne Laser and Photodiode
W.J. Yoo ; Lee, G.S. ; Kim, J.D. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 69~77
This laser measurement system has been developed using He-Ne laser and photodiode. The laser beam intensity transmitted on a photodiode was disturbed by eccentrically rotating disk cam with various speeds. The photodiode and an amplifier were used to change the detected beam intensity into voltage. The digitized data through the developed system were recorded on a micro-computer by using a signal analysis program. Its reliability was ascertained by using FFT analyzer. The vibration of rotating disk cam can be analyzed by measureing the intensity change of laser beam which the results by FFT analyzer were similar to. The amplifier was devised to be able to modulate the fluctuations of laser beam. The voltage could be linearly recorded with the change of the laser beam intensity.
Surface Defect Inspection Method of Iron Samples using Image Processing
H.S. Ahn ; K.W. Jeong ; Kim, J.H. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 78~88
For producing iron or steel products with good quality, the concentration of the material components should be analyzed quickly with high relability using XRF(Fluorescent X-Ray Spectrometer). Since the analysis results are much dependent upon the surface con- dition, the samples have to be prepared to have good test condition. This study presents an image processing system for inspecting the surface condition of the iron test sample. In order to use thd computer vision system, we need to develop a lighting device and image processing algorithm. For the adequate lighting device of inspection system, the indirect lighting device is contrived to cut the external light and provide uniform, stable and cold light. The image processing algorithm is aimed to reduce inspection time and to get similar analyzing results to those of the experienced operators. At first, the image processing algorithm checks whether the surface of the iron sample is ground well or not. Then, the defects; hole or dig are conted and surface condition is evaluated. In addition, the algorithm gives the reliability of the analyzing results in order to help operator's decision.
On Dual Boundary Integral Equations for Crack Problems
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 89~101
Prediction of Cutting Temperature at High Speed Steel in Orthogonal Turning based on Finite Element Method
T.O. Jun ; C.E. Bae ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 102~112
Temperature distribution on the rake face and flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junction imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on both the rake face and flank face of cutting tool with high speed steel. The analytical results show that the temperature on the top flank face of a tool is higher than it on the top rake face of the tool because of the difference of the friction velocity on each face of the tool.
Effect of State of Stress on Compressive Failure in Carbon-Fiber/Epoxy Composites;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 113~120
A Study on the Optimal Probe Path Generation for Sculptured Surface Inspection Using the Coordinate Measuring Machine
M.W. Cho ; S.J. Yi ; Kim, M.K. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 121~129
The objective of this research is to develop an effective inspection planning strategy for sculptured surfaces by using 3-dimensional Coordinate Measuring Machine (CMM). First, the CAD/CAM database is generated by using the Bezier surface patch mathod and variable cutter step size approach for design and machining of the workpiece model. Then, optimum measuring point locations are determained based on the mean curvature analysis to obtain more effective inspection results for the given sample numbers. An optimal probe sequence generation method is proposed by implementing the Traveling Salesperson (TSP) algorithm and new guide point selection methods are suggested based on the concepts of the variable distance between the first and second guide points. Finally, simulation study and experimental work show the effectiveness of the proposed strategy.
A Study on the Prediction of the Kerf Width Geometry and the Heat-affected zone in laser Cutting of the alloy Tool Steels(STD11)
Y.M. Cho ; U.J. You ; Kim, J.D. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 130~137
With the rapid growth of the die and mold, the new die making method has been developed. Especially, the laser is very useful, because it has a very fast cutting speed and is possible to manufacture complicated geometry. The quality of the laser cut is to be evaluated with respect to some characteristic quality parameters such as kerf width geometry, roughness and heat affected zone. This paper describes the laser cut characteristic(heat-affected zone) of the alloy tool steels(STD11) and the prediction of the kerf width genmetry by the FEM. On using the oxidation heat and laser beam, the prediction of kerf geometry is more accurate than that only by the laser beam. After laser cutting, the heat-affected zone is generated on the cutting cross section. The magnitude of hardness on the cutting cross section was similar to that of the heat treatment. It was possible to predict heat-affected zone by using the FEM program.
A Quantitative Performance Index for Discrete-time Observer-based Monitoring Systems
K.S. Huh ; Kim, S.J. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 138~148
While Model-based Monitoring systems based on state observer theory have shown much promise in the laboratory, they have not been widely accepted by industry because, inpractice, these systems often have poor performance with respect to accuracy, band-width, reliability(false alarms), and robustness. In this paper, the linitations of the deterministic discrete-time state observer are investigated quantitatively from the machine monitoring viewpoint. The limitations in the transient and steady-state observer performance are quantified as estimation error bounds from which performance indices are selected. Each index represents the conditioning of the corresponding performance. By utilizing matrix norm theory, an unified main index is determined, that dominates all the indices. This index could from the basis for an observer design methodology that should improve the performance of model-based monitoring systems.
Detection of Chatter Vibration in End-Mill Process by Neural Network Methodology
E.S. Chung ; J.B. Ko ; Kim, K.S. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 149~156
This paper presents a method of detecting chatter vibration in end-mill process. The detecting system consists of an adaptive signal processing scheme which uses an autore- gressive time-series model and a neural network is proposed and is verified its effectiveness by using acceleration and cutting force signals recorded during slotting in end-mill operations. Expeerimental results indicate that the proposed system provides excellent detection when chatter is occured within the ranges of cutting conditions considered in this study and an effectiveness of the integration of signals is confirmed.
Two Degree of Freedom Robust Controller Design of a Seeker Scan-Loop
Lee, H.P. ; C.S. Song ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 157~165
The new formulation of designing the two degree of freedom(TDF) robust controller is proposed using
optimization and model matching method. In this formulation the feedback controller and feedforward controller are designed in a single step using
optimization procedure. Roughly speaking, the feedback controller is designed to meet robust stability and disturbance rejection specifications, while the feedforward controller is used to improve the robust model matching properties of the closed loop system. The proposed formulation will be illustrated and evaluated on a seeker scan-loop. And the performances of TDF robust controller are compared with those of the
controller designed using Loop Shaping Design Procedure proposed by McFarlane and Glover.lover.
A Study on the Design of Flexible Manufacturing Systems by using Petri Nets
Kim, G.B. ; Lee, K.I. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 10, 1995, Pages 166~174
Flelxible Manufacturing Systems(FMS), which consist of various machine groups, can produce machine parts in different physical dimensions and lot sizes. In this paper, a novel method which utilizes Colored and Timed Petri Net is proposed to model a FMS. Each machine group of FMS is modulized and modeled using expanded Petri Nets. Colored and Timed Petri Nets are defined, and the flexible manufacturing systems's design algorithm based on this definition is developed and verified in a real FMS plant by computer simulations.