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후판 포밍을 위한 센터 캐어리어 타입 프로그레시브 금형 개발에 관한 연구
이성택(S. T. Lee),심성보(S. B. Sim) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The progressive die among the press working performs a series of fundamental sheet metal processes with multi-stages, particularly this study regards to develop the center carrier feeding type die for thick sheet metal(SS41, 2mm) forming process as a specific division. In order to prevent a defect on the production, the analysis of production part, optimum design of strip process layout, die design and die making and tryout etc. are necessary. In this study, we designed and predicted the progressive die design result of by wide collected data base through the field experiences, theoretical back ground and computer aided FEM simulation.
김영국,윤문철,하만경,심성보,Kim, Y.K.,Yoon, M.C.,Ha, M.K.,Sim, S.B. 한국기계가공학회 2002 한국기계가공학회지 Vol.1 No.1
In this study, the static and dynamic characteristics of endmilling process was modelled and the analytic realization of chatter mechanism was discussed. In this regard, We have discussed on the comparative assessment of recursive time series modeling algorithms that can represent the machining process and detect the abnormal machining behaviors in precision endmilling operation. In this study, simulation and experimental work were performed to show the malfunctional behaviors. For this purpose, new recursive least square method (RLSM) were adopted for the on-line system identification and monitoring of a machining process, we can apply these new algorithms in real process for detection of abnormal chatter. Also, The stability lobe of chatter was analysed by varying parameter of cutting dynamices in regenerative chatter mechanics.
0.5T<sub>m</sub> 이하에서의 AZ31 마그네슘합금의 크리이프 변형과 단시간 파단수명예측
강대민,안정오,전성호,구양,심성보,Kang, D.M.,An, J.O.,Jeon, S.H.,Koo, Y.,Sim, S.B. 한국소성가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
The initial strain, the applied stress exponent, the activation energy, and rupture time in AZ31 magnesium alloy have been measured in order to predict the deformation mechanism and rupture life of creep over the temperature range of 423-443K. Creep tests were carried out under constant applied stress and temperature, and the lever type tester and automatic temperature controller was used for it, respectively. The experimental results showed that the applied stress exponent was about 9.74, and the activation energy for creep, 113.6KJ/mol was less than that of the self diffusion of Mg alloy including aluminum. From the results, the mechanism for creep deformation seems to be controlled by cross slip at the temperature range of 423-443K. Also the higher the applied stress and temperature, the higher the initial strain. And the rupture time for creep decreased as quadratic function with increasing the initial strain in double logarithmic axis.
0.5Tm 이하에서의 AZ31 마그네슘합금의 크리이프 변형과 단시간 파단수명예측
강대민(D. M. Kang),안정오(J. O. An),전성호(S. H. Jeon),구양(Y. Koo),심성보(S. B. Sim) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
The initial strain, the applied stress exponent, the activation energy, and rupture time in AZ31 magnesium alloy have been measured in order to predict the deformation mechanism and rupture life of creep over the temperature range of 423- 443K. Creep tests were carried out under constant applied stress and temperature, and the lever type tester and automatic temperature controller was used for it, respectively. The experimental results showed that the applied stress exponent was about 9.74, and the activation energy for creep, 113.6KJ/mol was less than that of the self diffusion of Mg alloy including aluminum. From the results, the mechanism for creep deformation seems to be controlled by cross slip at the temperature range of 423-443K. Also the higher the applied stress and temperature, the higher the initial strain. And the rupture time for creep decreased as quadratic function with increasing the initial strain in double logarithmic axis.
CBN 과 WA숫돌에 의한 연삭에서 연산력과 표면거칠기 특성
하만경,곽재섭,양재용,정영득,심성보,류인일 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
In this study an experimental investigation was conducted to find the grinding characteristics of ceramics, STD11 and STS304 materials. The grinding force and the microscopic observation of the workpieces were obtained in surface grinding. Grinding characteristics of ceramics were inspected through the microscopic examination, the cutting force, and the surface roughness. It has been found that the grinding force of ceramics is relatively low as compared to that of steels and that CBN wheel has an excellent performance. The surface roughness was measured according to the feedrate and the depth of cut.