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최성대(Seong Dae Choi),김기만(Gi Man Kim),김잠규(Jam Kyu Kim),허빈(Bin Xu),김종환(Jong Hwan Kim),이달식(Dal Sik Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
The vibrating situation of machining center is natural during operating it. If it is possible that you are understanding in theory of mechanism about vibrating situation of machining center and get the hang of vibrating aspect through analysis and control it. It will be very useful for the improved stability and high-speed in operating a machining center for developing productivity.
최성대(Seong Dae Choi),김기만(Gi Man Kim),김잠규(Jam Kyu Kim),허빈(Bin Xu),김종환(Jong Hwan Kim),이달식(Dal Sik Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
The vibrating situation of machining center is natural during operating it. If it is possible that you are understanding in theory of mechanism about vibrating situation of machining center and get the hang of vibrating aspect through analysis and control it. It will be very useful for the improved stability and high-speed in operating a machining center for developing productivity.
2축 피로시험에서 혼합모드(Mode Ⅰ + Ⅱ) 구현에 관한 연구
최성대(Seong-Dae Choi),정선환(Seun-Hwan Cheong),김잠규(Jam-Kyu Kim),김기만(Gi-Man Kim),최명수(Myong-Su Choi),김우재(Woo-Jae Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The wavelet transform is a popular tool for studying intermittent and localized phenomena in signals. In this study the wavelet transform of cutting force signals was conducted for the detection of a tool failure in turning process. We used the Daubechies wavelet analyzing function to detect a sudden change in cutting signal level. A preliminary stepped workpiece which had intentionally a hard condition was cut by the inserted cermet tool and a tool dynamometer obtained cutting force signals. From the results of the wavelet transform, the obtained signals were divided into approximation terms and detailed terms.
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),김잠규(Jam-Kyu Kim),최명수(Myoung-Su Choi),공병채(Byeong-Chae Gong) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
The complicated stress modes which are common in most machine structures and parts make the analysis of fracture mechanism The fracture mechanism which are common in most machine structures and parts shows mixed-mode stress. It is very difficult to analyze its behavior using numerical method. In this study, the experiment of fatigue crack growth as varying of stress ratio was carried out and its effects was analyzed. And existence of fatigue fracture closure was observed through fractured surface.
평판TV 프레임의 PEM NUT 대체용 Forming 설계
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),김잠규(Jam-Kyu Kim),임광빈(Kwang-Bin Lim),김우재(Woo-Jae Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Structure which is being used for flat TV is consisted almost of press products. Because of characteristic of structure, pemnut that is used for maintaining gaps of other parts and screwing is using by attaching on frame. But, there are some issues about weight and price. This study is about using forming instead of pemnut on frames, and deducing the best answer by comparing analysis of forming designing on background of tension press and twisting.
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),권현규(Hyun-Kyu Kweon),김기만(Gi-Man Kim),김잠규(Jam-Kyu Kim) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.3
The overlay welding the automobile where the durability is demanded, it is used in the vessel engine valve, plant valve and pump parts. Cause of damage public opinion one what is thought is the fatigue load due to the opening and shutting operation right time repetition of the engine valve. The damage cause of the engine valve or explanation of destruction mechanism is very difficult. The research which it sees to make clear a overlay welding of Co-alloy by Plasma Transferred Arc Weld Surfacing Process reconsideration fatigue crack initiation and fatigue crack growth mechanism at high temperature.
혼합모드(Mode Ⅰ+Ⅱ)구현을 위한 2축 피로시험 JIG 설계
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),김기만(Gi-Man Kim),김잠규(Jam-Kyu Kim),최명수(Myoung-Su Choi),김우재(Woo-Jae Kim) 한국산업융합학회 2008 한국산업융합학회 논문집 Vol.11 No.2
Elements of a mechanical structure are getting from multi-axles stress. so fatigue characteristic experiment Shall execute in multi-axles stress state. it is very hard to apply according to forms of a testing machine and implementation. In this study, 2 axles fatigue testing machine did a design and Development. a new JIG developed to realize a mixed mode. a stress state in mixed mode of a specimen had each other comparison using the Finite element method to examine propriety of a new JIG.
양세영(Se-Young Yang),공병채(Byeong-Chae Gong),김잠규(Jam-Kyu Kim),최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
The general way to process the surface by means of the laser was heat treatment for strengthening the surface hardness. They have used the laser for changing the property of the surface, especially for metal. Generally, it is recent increasing tendency to use the thin plate panel for making things smaller and lightweight. However, it is needed to install something upholding at the thin plate panel or engrave the grooves or wave on them so that they have moment of inertia or can be strengthened, Therefore it is expected that the thin plate panel can be harder and more stable through processing of the metal surface by laser beam irradiation and hardness of thin plate possibly can be also changed how many parts of them are harden. Through this research, it can be grasped how the hardness changes and mechanical characteristic changes by width and depth of groove by laser affect the von-mises by the ratio of hardening area/total area and characteristic of displacement and structural characteristic for making the thin plate harder by the strengthening metal surface of thin plate by laser through the experiment and analysis of FEA can be presented.
최성대(Seong-dae Choi),정선환(Seon-hwan Cheong),김기만(Gi-man Kim),권현규(Hyun-kyu Kwon),김잠규(Jam-kyu Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
In this study, we find that IPMC's mechanical characteristics in distilled water. Nafion is used as a base ionic polymer. IPMCs in mechanical electronic polymer are materials that are different with common actuator such as motor have bending work, working in low voltage, lightness, flexibility, and actuation within liquid. The nature of IPMC characteristics with the muscle of the human being the nature which is similar having the possibility which as the organism imitation style activator and the sensor is infinite. In order to examine like this possibility we try to investigate the examples which experiments from different data and application methods, actually Nafion 177 and an experiment about the answer back quality which follows in standard, impressed voltage and authorization frequency and used IPMC where comes to make the gold with the basic material and from distilled water inside environment, the result of we accomplished we produced.