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노승남,윤종학 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.2
The discrimination of flaw shape and sizing is very important subject in the material evaluation for semiconductor and new materials. The aim of this paper is to investigate the spectrum analysis of artificial defect captured from steel ball embedded in the resin. The results show that it can be evaluated quantitatively the size of artificial defect, from the amplitude variation of same frequency if the probe with same diameter and focal length is used. Comparing with the amplitude variation of the high frequency component and low frequency component obtained from the distance of defect center position, it can be estimated steel ball and flat bottm defect.
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노승남,이동훈 서울産業大學校 2002 논문집 Vol.53 No.1
This paper is to investigate the propagation characteristics of cutting noises from an end-mill machining process. The cutting noises are measured by a condenser microphone and analyzed by the narrow band and constant percentage bandwidth analyzer(FFT). The cutting conditions such as cutting speed, table speed and cutting depth are varied in the cutting noise measurements. The SM45C steel, GC200 cast iron, 6:4 brass and Al2017 aluminium are used as a workpiece for up end-mill machining, In addition, the hardness, tensile stress and damping ratio of workpieces are measured for obtaining the relationship between the material property of workpiece and the sound pressure level of cutting noise, From the cutting noise measurements, it is found that the sound pressure level of cutting noise increases with the cutting speed and the depth of cut as well as the damping ratio and hardness. Regardless of the kind of workpiece, it is also shown that the cutting noise is generated in frequency band between 2800Hz and 3600Hz.
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STS304 切削條件에 따른 切削抵抗 및 表面粗度에 關한 硏究
노승남,김엽래 서울産業大學校 1990 논문집 Vol.31 No.1
An experiment was conducted to study the effect of cutting conditions on the cutting resistance and surface roughness in vertical milling of STS304 with the sintered carbides tip inserted face milling cutter under varying test conditions such as cutting speed, feed per tooth and depth of cut. 1.For best mechanical efficiency, the cutting speed higher than 261m/min, the feed per tooth lower than 0.04mm/tooth, the depth of cut less than 0.5mm are found to be preferable. 2.For the purpose of having fine surface roughness, it is recommended that the outting speed is to be higher than 187m/min, the feed per tooth lower than 0.06mm/tooth and the depth of cut less than 0.08mm in the vertical milling work. 3.The finest surface roughness was obtained in the cutting speed of about 187m/min. This cutting speed is considered to be the critical speed of B.U.E. formation.
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노승남,오선 서울産業大學校 1995 논문집 Vol.42 No.1
It is necessary to construct useful CAD systems which can designing high quality objects in short periods of time. A methodology on the interactive style CAD system for generating and manipulating 3-D objects such as rings, brooches and car bodies with complicated freeform surface is considered. The following three types of problems are mainly discussed. (1) The problem of constructing an interactive style CAD system, (2) The problem of constructing shape models with freeform surfaces, (3) A method of man-machine interaction. An efficient algorithm for generating freeform curves passing through given points is presented too.
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CAD/CNC 시스템에서 曲線의 實時間 補間에 關한 硏究
오선,노승남 서울産業大學校 1995 논문집 Vol.41 No.1
The interpolation depends on the method of curve representation, that is, the use of an implicit or a parametric form. Accordingly, this paper presents two realtime interpolation algorithms and compares them with existing CAD interpolators. With the new interpolators, the amount of geometric information transferred from the CAD system to CNC system is reduced by orders of magnititude. Moreover, the contour errors caused by the new interpolators are much smaller than those caused by conventional CAD interpolators.
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CAM 시스템에서 시뮬레이션을 利用한 非對稱形 캠의 旋削加工
노승남,오선 서울産業大學校 産業大學院 1997 大學院論文集 Vol.5 No.-
In the case of Non Circular Turning for instance cam shaft, the process is further complicated by the fact that the cutting parameters are continuously varying as function of position and other parameters. As the existing turning models assume these parameters to be constant, they are not capable of handling this simulation. The major difference in the NCTP and existing turning model is that in the case of NCTP as the tool is actuated in the radial direction, the effective cutting parameters like back rake angle and clearance angle are varied. This paper used TESTBED program that developed for non circular turning simulation.
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盧勝男 서울産業大學校 1985 논문집 Vol.22 No.1
This paper describes Ability of Magnetic Particle Testing in following conditions. Change of Flux Density according to distance of two poles and increase of stress. Power appearance by direction of magnetic poles. And Defects of test piece are graduate in comparison with A type standard test piece.
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盧勝男 서울産業大學校 1986 논문집 Vol.24 No.1
Eddy Current Testing is better method than Ultrasonic Testing or X-ray Testing method, to find a defect and to mesure a thickness of small pipe in bending and corrosion. In this paper, the best frequency is decide by phase angle and character of various coil impedance according to change of diameter and thickness in stainless pipes. The result of the experiment show that the phase angle of defect signal in increased with decreasing the standard depth of defect. And it's aspiration is to use in Eddy Current Testing of nonmagnetic pipes.
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특수공작기계에서 쇼트피닝기의 특성 및 투사속도에 관한 연구
노승남,이승호,서유원 서울산업대학교 산업대학원 2000 大學院論文集 Vol.7 No.-
As developing the technology in industry, the materials with superior grade of stiffness and lightness are required, and hence the higher fatigue strength characteristics are necessary. Thus, the non-traditional machining to increasing fatigue strength is becoming influence as very important technology. Shot peening process is essential to ensure repeatability and uniformity on a part to part and lot to lot basis, while conforming to the applicable specifications. The shot material, size, shape and hardness as well as velocity and impact angle must be rigidity controlled to provide consistency in peening results. High velocity of the shot ball increases the impact energy, the shot peening intensity increase. Comparing with the are height for the velocity 42m/sec, the are height for 56m/sec and 70m/sec increase 33% and 48% respectively.
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