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배효준,이상재,서영백,박흥식,Bae, H.J.,Lee, S.J.,Seo, Y.B.,Park, H.S. 한국기계가공학회 2002 한국기계가공학회지 Vol.1 No.1
High speed machining system have been used in industrial because it is effective to a material manufacturing with various shape. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in aircraft, automobile part and molding industry. Therefore this study proposed to decide best manufacturing cutting condition for surface roughness and rapid manufacturing tune by using computer Image processing system and 3D modelling. Until the 16,000 rpm, the surface roughness is decreased rapidly, but it is not over that. The 22,000 rpm is the spindle speed with the optimum surface in the high speed end-milling. In the case of the feed rate with 2,000 mm/mm and 8,000 mm/mm, the surface roughness is better than 4,000 mm/min and 6,000 mm/min. By using the 3D modelling, it is effectively represented shape characteristics of working surface m high speed end-milling.
서영백,김동호,이광영,박흥식,전태옥 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.1
Microscopic examination for the morphological estimation of wear debris on the oil-lubricated moving system is an accepted method for machine condition and fault diagnosis. However wear particle analysis has not been widely accepted industry because it is dependent on expert interpretation of particle morphology and relies on subjective assessment criteria. This paper was undertaken to estimate the morphology of wear debris on the oil-lubricated moving system by computer image analysis. The wear test was performed under different sliding conditions using a wear test device made in our laboratory and wear testing specimen of the pin-on-disk-type was rubbed in paraffine series base oil. In order to describe characteristics of debris of various shape and size, four shape parameters (50% volumetric diameter, aspect, roundness and reflectivity) have been developed and outlined in the paper. A system using such techniques promises to obviate the need for subjective, human interpretation of particle morphology in machine condition monitoring.
박흥식,서영백,이충엽,조연상 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.5
The morphologies of the wear particles are directly indicative of wear processes occuring in machinery and their severity. The neural network was applied to identify wear debris generated from the machine driving system. The four parameters (50% volumetric diameter, aspect, roundness and reflectivity) of wear debris are used as inputs to the network and learned the friction condition of five values (material 3, applied load 1, sliding distance 1). It is shown that identification results depend on ranges of these shape parameters learned. The three kinds of the wear debris had a different pattern characteristic and recognized the friction condition and materials very well by artificial neural network. We dicussed how the network determines difference in wear debris feature, and this approach can be applied to foreseeability and decision fro moving condition of the Machine driving system.
마찰조건의 판정을 통한 기계습동면의 Condition Monitoring
조연상,김동호,서영백,박흥식,전태옥 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.1
Wear particles can be collected from the lubricants of machinery and its morphology is directly related to the damage to the interacting surfaces from which the particles originated. The morphology of the wear particles on friction condition are therefore directly indicative of wear processes occuring in machinery. This paper was undertaken to condition monitoring of the lubricated machine surface through decision of friction condition by neural network model. In order to describe the characteristics of wear debris with various shapes and sizes, the four shape parameters (50% volumetric diameter, aspect, roundness and reflectivity) of wear particles on friction condition are used as inputs to the network and learned the friction condition of five values.
Pulse YAG Laser 제어 시스템에 의한 공구강의 조직 특성에 관한 연구
옥철호,서영백,배춘익,박흥식,전태옥 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.2
Case Organization Characteristics of tool steel (SK5) was investigated after Pulse YAG laser control system irradiation. In the case of beam passes, martensite formed in the melt zone and in former pearlite regions of the austenization zone exhibited very high vickers hardness values. Molten depth and width depend on defocusing distance and radius, micro structure, hardness were investigated as a function of defocusing distance, pulse width, power density and black color painting have a energy absorption more than other any color painting.