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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
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Journal DOI :
Korean Society of Precision Engineering
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Volume & Issues
Volume 8, Issue 4 - Dec 1991
Volume 8, Issue 3 - Sep 1991
Volume 8, Issue 2 - Jun 1991
Volume 8, Issue 1 - Mar 1991
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An Experimental Study on the Residual Stress Distribution at Circumferential Welds in Pipes
Namkoong, Jae-Gwan ; Hong, Jae-Hak ;
Journal of the Korean Society for Precision Engineering, volume 8, issue 1, 1991, Pages 41~49
A knowledge of the resdual stress distribution at circumferential weldments can normally increase the accuracy of a fracture assessment in pipe line. In this paper, we present the measurements about the residual stress distributions at three kinds of circumferential butt welded pipes using the holl drilling strain gage method. By this experiment, we have obtined the following characteristics. At the inner surface of the pipe region near the center line of welding is under high tensile residual stress. However, as the distance from the center line of welding increases, the tensile component decreases and finally becomes compressive residual stress at region far away from the center line of welding. The longitudinal residual stress at the outer surface is compressive regardless of the diameter of pipe and the circumferential stress is changed from compressive to tensile as pipe diameter increases. The results also demonstrate that the residual stress is mainly caused by self-restraint bending force in the pipe welding.
A Study on the Analysis and Application for stiffness of Corrugated Plate
Chung, Kang ; Chung, Suk-Choo ;
Journal of the Korean Society for Precision Engineering, volume 8, issue 1, 1991, Pages 50~62
In this study, the bending and twisting stiffnesses of corrugated plate are analyzed by applying equivalent idea. And the natural frequencies as an application example of the stiffnesses are analyzed by considering corrugated plate as orthotropic plate. The validity of analytic results is examined by comparing with experimental results by fast Fourier transformation analyzer.
Machinability of Carbon Fiber Epoxy Composites in Turning
Kim, Gi-Soo ; Lee, Dai-Gil ; Kwak, Yoon-Keun ; Nam-Gung, Gung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 8, issue 1, 1991, Pages 63~73
Carbon fiber epoxy composite materials are widely used in the structures of aircrafts, robots and other machines because of their high specific strength, high specific stiffness and high damping. In order for the composite materials to be used in aircraft structures or machine elements, accurate surfaces for bearing mounting or joints must be provided, which require precise machining. In this paper, the machinability of the carbon fiber epoxy composite materials in turning was experimentally investigated. The cutting mechanism and the Taylor Tool Wear constants were determined and the surface roughness was measured w.r.t. cutting speeds and feed rates.
A Study on the Correlation of Orthogonal Cutting all sorts Parameter and Acoustic Emission Signal
Kim, Jae-Yeol ; Sim, Jae-Gi ; Park, Hwan-Gyu ; O, Hwan-Gyo ;
Journal of the Korean Society for Precision Engineering, volume 8, issue 1, 1991, Pages 74~83
A study on the Correlation of Orthogonal Cutting Parameter (Cutting speed, Depth of cut, Feed Rate) and Acoustic Emission Signal. It is well known that acoustic emission (AE) is the emission of elastic wave resulting from the deformation and fracture of materials. This study estabished correlation of orthogonal cutting parameter and AE signal, and researched into in-process monitoring of tool wear and failure. The results are as follow; 1. AE RMS was under the influence of cutting speed but hardly influenced by depth of cut and feed rate. 2. AE RMS was under the influence of flank wear. 3. AE count rate increased by increased cutting speed. 4. AE RMS value was rapidly increased in 130 m flank wear.
A Study on the Crater Wear of Carbide Tool in Cutting SUS304
Kang, Won-Suk ; Oh, Seok-Hyung ; Kim, Jong-Taeg ; Seo, Nam-Seob ;
Journal of the Korean Society for Precision Engineering, volume 8, issue 1, 1991, Pages 84~95
This paper deals with crater wear when the SUS304 steel which forms the saw- toothed chip was cut by carbide tools. When the saw-toothed chip was formed, and optical creater wear measuring technique was used which provides complete information, both qualitatively and quantitatively, on the crater development. In this optical contour mapping technique an profile projector was used, making it possible to draw the depth contours of the crater directly. 98 contour maps of crater wear representing twelve different cutting conditions were presented. Also, the rake angles changed to have
An Experimetal Study on the Damping Characteristics of Liquid Sloshing
Yang, Bo-Suk ; Jun, Soon-Ki ; Kim, Won-Chul ;
Journal of the Korean Society for Precision Engineering, volume 8, issue 1, 1991, Pages 96~104
This study is concerned with the fluid sloshing dampers to suppress the high vibration in the resonance and operating regions. An experimental investigation was conducted to determine the logarithmic decrement, natural frequency, tuning frequency ratio of oscillation of liquids contained in an spherical rigid container. The decay of the vibration amplitude was studied for the range of liquid filling ratio in container. The results of the investigation indicate that the sloshing motion of liquids results in an increase in the available effective damping when the filling ratio is in the region near H/R=1.3-1.6.
CAD/CAPP System based on Manufacturing Feature Recognition
Cho, Kyu-Kab ; Kim, Suk-Jae ;
Journal of the Korean Society for Precision Engineering, volume 8, issue 1, 1991, Pages 105~115
This paper describes an integrated CAD and CAPP system for prismatic parts of injection mold which generates a complete process plan automatically from CAD data of a part without human intervention. This system employs Auto CAD as a CAD model and GS-CAPP as an automatic process planning system for injection mold. The proposed CAD/CAPP system consists of three modules such as CAD data conversion module, manufacturing feature recognition module, and CAD/CAPP interface module. CAD data conversion module transforms design data of AutoCAD into three dimensional part data. Manufacturing feature recognition module extracts specific manufacturing features of a part using feature recognition rule base. Each feature can be recognized by combining geometry, position and size of the feature. CAD/CAPP interface module links manufacturing feature codes and other head data to automatic process planning system. The CAD/CAPP system can improve the efficiency of process planning activities and reduce the time required for process planning. This system can provide a basis for the development of part feature based design by analyzing manufacturing features.
Development of Cutting Force Model for Face Milling Operation Using 3-Directional Specific Cutting Force Coefficients
Kim, Hee-Sool ; Lee, Sang-Suk ;
Journal of the Korean Society for Precision Engineering, volume 8, issue 1, 1991, Pages 116~129
A cutting force model for face milling operation using 3-directional specific cutting force coefficients is developed. The model is taken into consideration factors such as cutter geometry, machining conditions, spindle eccentricity, insert initial postion errors, etc. The simulated force in X, Y, Z directions from the model are subsequently compared with measured forces in the time and frequency domains. The simulated forces have a good agreement with measured forces.