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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 8, Issue 6 - Dec 1999
Volume 8, Issue 5 - Oct 1999
Volume 8, Issue 4 - Aug 1999
Volume 8, Issue 3 - Jun 1999
Volume 8, Issue 2 - Apr 1999
Volume 8, Issue 1 - Feb 1999
Selecting the target year
The Design and Control Super-Precision Coarse and Coarse and Fine Positioning Apparatus
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 9~14
Development of a Machining Error Estimation System for Vertical Lathes with Structural Deformation and Geometric Errors
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 15~22
In this study, a machining error estimation system far vertical lathes with structural deformation and geometric errors, is realized based on the virtual manufacturing technologies. The positional and directional errors of cutting tool are determined by considering the geometric errors and dimensions of machine components and by introducing the equilibrium condition between the cutting force and structural deformation. Especially, the machining errors of vertical lathes are estimated by using the prescribed cutting test(JIS B 6331). The system can be implemented to evaluate the machining accuracies of vertical lathes at the design process and to design the high precision vertical lathes.
A study on stress analysis of aluminium wire in hybrid IC using far vehicles (A force analysis acting on aluminium wire)
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 23~27
A lot of electronic parts are used for recent vehicles. If electronic parts break down, it will bring passenger to fatal wound. The very representative trouble of electronic parts is a cut aluminium wire of a hybrid IC. In this study, I analyzed a cause of cut aluminium wire and the main results obtained on this study are summarized as follows; (1) The forces acting on the aluminium wire are because of thermal expansion of a resin. (2) The forces acting on the aluminium wire are obtained by the theoretical analysis and those results are agree well with those of the FEM.
Volumetric Error Compensation of a 3-Axis Horizontal Machining Center in the Post-processor
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 28~34
The objective of this study is to estimate and to compensate far the volumetric error of a workpiece influenced by the geometric error of a machine tool. In this paper, the volumetric error is defined and the error synthesis model is presented. Then, the volumetric error of workpiece is calculated and compared through the simulation, and a new tool-path is generated to compensate for the error in the post-processor of CAM system using the error synthesis model. By this method, the error is compensated without modification or replacement of a machine tool being in use.
Application of Delaunay Triangulation on RP
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 35~41
STL which is used in Rapid Prototyping is composed of a lot of triangular facets. The number of triangles and the shapes of these triangles determine the quality of STL. Therefore, proper algorithm is necessary to enhance the quality of triangular patch. In this paper we used the Delaunay triangulation method to apply to following processes. 1) On processing for reducing sharp triangles which cause errors on intersection. 2) On processing for connecting two or more collinear edges. 3) On processing for deleting unnecessarily inserted points in coplanar polygon.
A Study on Diagnostics of Machining System with ARMA Modeling and Spectrum Analysis
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 42~51
An experimental modeling of cutting and structural dynamics and the on-line detection of malfunction process is substantial not only for the investigation of the static and dynamic characteristics of cutting process but also for the analytic realization of diagnostic systems. In this regard, We have discussed on the comparative assessment of two recursive time series modeling algorithms that can represent the machining process and detect the abnormal machining behaviors in precision round shape machining such as turning, drilling and boring in mold and die making. In this study, simulation and experimental work were performed to show the malfunctioned behaviors. For this purpose, two new recursive approach (REIVM, RLSM) were adopted fur the on-line system identification and monitoring of a machining process, we can apply these new algorithm in real process for the detection of abnormal machining behaviors such as chipping, chatter, wear and round shape lobe waviness.
Development of Shape Optimization System using Stress Control
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 52~58
In this study, the growth-strain method was used for shape optimization. The adequate value of growth ratio in the method was used the value obtained by volume control. And the linear PID control theory was applied to control internal stresses by stresses required by a designer. The effect of the values of
was investigated and the adequate values of
were determined empirically. Finally, a shape optimal design system was built up by the improved the growth-strain method with a commercial software I-DEAS. The effectiveness and practicality of the developed shape optimal design system was verified by some examples.les.les.les.
A Study on Performance of LNG Engine by Using 2-Zone Combustion Model
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 59~65
To reduce the particulate matter and nitrogen oxides from diesel engine, many studies are proceeding and being accomplished practically. In this situation, LNG engine has important meaning as a clean fuel and alternative energy. In this reason, we try to understand the property of LNG fuel and predict the performance with using LNG engine simulation program and practical test. It could help to lead and apply practically LNG engine was studied in performance and other parameter related with engine performance and compared with current diesel engine. The simulation program was proved to be good in describing the experimental result. This means current heavy duty vehicle could be modified to LNG engine.
The Analysis of Noise using of Inverse Problem in Acoustic Field
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 66~75
This paper is concerned with a analysis of noise by inverse problem available for analyzing the two and three-dimensional acoustic field problems. The noise of analysis considered in this study can be reduced to an optimum problem to find the optimal set of parameters defining the vibrating state of noise source surfaces. The optimal set of parameters are searched by the standard optimization procedure minimizing the square sum of the residuals between the measured and computed quantities of sound pressure at some points in the acoustic field. Computation is carried out for typical examples in which the noise sources are located on the infinite plane. It is demonstrated that the noise of analysis can be effectively made by using the sensitive reference data.
Grinding Characteristics of Diamond Burs in Dentistry
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 76~82
This study was carried out to verify finding performance of dental diamond bur and investigate the possibility of AE application in density field. Work pieces were made of acryl and bovine respectively for the experiments in this study. Grinding test was conducted to get the data of grinding resistance and specific finding energy of low different types of diamond bur by using tool dynamometer. AE signal was acquired to verify grinding process in the AE measuring system. AErms value was increased as the grinding velocity and depth were increasing, but it decreased as the feed rate was increasing. The case of the small value of AE signal is due to abnormal grinding in D type diamond bur. By analyzing AErms start and finish time of grinding working, abnormal grinding state can be confined. Abnormal state can be found through the behavior of AE signal in the finding working. As a result, it is expected that forecast of abnormal state is possible using AE equipments under real time process.
Development of a Virtual Machining System by a CAD Model Based Cutting Simulation
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 83~91
In this paper, we suggest a virtual machining system that can simulate cutting forces of ball end milling at the stage of part design. Cutting forces, here, are estimated from the machanistic model that uses the concept of specific cutting farce coefficient. To this end, we need undeformed chip thickness which is used for calculating chip load. It is derived from the Z-map data of a CAD model. That is, chip load is the height difference between the cutting tool and the workpiece at an arbitrary position. The tool contact point is referred from the cutter location data. On the other hand, the workpiece height is acquired from the Z-map model of a CAD data. From the experimental verification, we can simulate machining process effectively to the slot and the side cutting of ball end mill.
A study on the Automatic Detection of the Welding Dimension Defect of Steel Construct using Digital Image Processing
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 92~99
The inspection unit which is developed and used in this study, is processed the shape data from the CCD camera to seek welding bite section shape, and then calculated as a real dimension from measuring the value of each inspection item. The reason of measuring with the real in this study is came out from the image method which used for a long time, which is extricated the characteristic as the dimension of pixel by recognize pixel. The measurement method of the section shape is that we decide the thresholding value after we drew the histogram to binarizate the object. After that, we make flat the object to get rid of the noise and measure the shape of welded part through the boundarization of the object. The shape measurement is that measure the value of the welding part to adapt the actual operation program from using the ratio between the actual dimension of the standard specimen and the dimension of image, to measure the ratio between the actual product and the camera image. The inspection algorithm which estimates the quality of welded product is developed and also, the software GUI(Graphic User Interface) which processes the automatic test function of the inspection system is developed. We make the foundation of the inspection automatic system and we will help to apply other welding machine.
Determination of Machining Parameters Considering Current Density in Three Dimensional Electrical Discharge Machining
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 100~106
Owing to the complexity of electrical discharge machining (EDM) phenomenon, it is very difficult to determine optimal machining parameters fer improving machining performance. This paper proposes a methodology for determining optimal electrical discharge machining parameters, which is maintaining suitable current density for increasing productivity or improving surface roughness. Machining area is closely related on optimal machining parameters in electrical discharge machining process, so calculation of machining area is needed in order to determine optimal machining parameters. In this study machining area, which is corresponding to the machining position, is calculated from intersection curves between the tool surface and a horizontal plane.
Structural Analysis of Multi-size Power Chuck for Lathes
Journal of The Korean Society of Manufacturing Technology Engineers, volume 8, issue 3, 1999, Pages 107~113
The purpose of this study is to analyze multi-size power chuck which can chuck work pieces having various sizes automatically and be used suitably to an exclusive product line in the field of automotive industry. Gripping force, accuracy, and stiffness about the chuck are especially considered for the analysis. MSC/NASTRAN software is used for FEM analysis. Also, the effects of centrifugal force which occurs when chuck body rotates and compressive stresses which occur at contacting area in between chuck body and collet are estimated.