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자기연마기술을 이용한 고속절삭공구의 성능향상에 관한 연구 : 고속절삭공구의 성능평가를 중심으로
조종래(J. R. Cho),양순철(S. C. Yang),정윤교(Y. G. Jung) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
In high speed cutting process, due to the friction between the tool and workpiece, a temperature rise of contacting part is serious. It need to develop cutting tool for overcoming such a poor condition. So now, some studies, the optimization of tool shapes, the fine grains of tool material, multi-layer coating of tools are processing. If mirror finishing on the tool is processed, there is advantage of relation between chip and tool, because of less friction, and also tool"s life would be increased. As a result mirror like finishing is expected efficient enhancement of tool. Generally, it is too difficult to process by a general way for tools of complex shapes, it is required a new method to process such complex shape tools. The magnetic fluid polishing technique can polish the workpiece of complex shape, because the polishing method which polishes as compress the workpiece by the magnetism abrasives to arrange to the linear according to the line of magnetic force. In this paper, We polished the surface of the high speed cutting tool using the magnetic fluid polishing technique, to enhance the performance of the high speed cutting tool.
극저온 LNG vaporizer에 대한 구조 건전성 평가
조종래(J.R. Cho),권정헌(J.H. Kwon),김창수(C.S. Kim),배찬효(C.H. Bae) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
The purpose of this study is to evaluate the integrity of LNG vaporizer. The LNG vaporizer is used to transfer the liquified natural gas which temperature is -196℃ and supplied pressure on purge mode is 5bar(0.5㎫). In the present work the temperature distribution and thermal stress are calculated by the finite element method. A commercial software(ANSYS 10.0) is used in the structural analysis for LNG vaporizer. In design condition calculated membrane, and membrane plus bending stress are lower than allowable stresses based on the ASME boiler and pressure vessel code. In operating condition the results are satisfied with the code limits.
조종래(J.R.Cho),정해영(H.Y.Jung),권진회(J.H.Kwon),최진호(J.H.Choi),조윤식(Y.S.Cho) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
The results of an experimental and analytical study of composite pressure hull on buckling pressure are presented for URN 300. We predicted the buckling and post buckling analysis of composite laminated cylindrical shell and panel under external compression by using ABAQUS/Standard[Ver 6.4]. To obtain nonlinear static equilibrium solutions for unstable problems, where the load-displacement response can exhibit the type of nonlinear buckling behavior, during periods of the response, the load and/or the displacement may decrease as the solution evolves, used the modified Riks method. Experiments were conducted to verify the validation of present analysis for cross-ply laminated shells. The shells considered in the study have four different lamination patterns, [±θ/0/90]<SUB>14s</SUB>,[±θ₁₄/0₁₄/90₁₄],[±45/0/90]<SUB>18s</SUB> and [/0/90]<SUB>18s</SUB>. At the result of this study, the optimized ply orientation angle is 75˚. The critical load from experiment is 69% of that of numerical analysis, because the fracture of matrix was generated before buckling. So URN 300 is not proper to use at the condition under high external pressure.
조종래(J.R. Cho),권정헌(J.H Kwon),김창수(C.S. Kim),배찬효(C.H. Bae),김현준(H.J. Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
The purpose of this study is to evaluate the integrity of combined LNG vaporizer. The combined LNG vaporizer is used to transfer the liquified natural gas which temperature is -160℃ and supplied pressure on LNG vaporization mode is 4bar(0.4㎫). In the present work the temperature distribution and thermal stress are calculated by the finite element method. A commercial software(ANSYS 11.0) is used in the structural analysis for combined LNG vaporizer. In design condition, calculated membrane and membrane plus bending stress are lower than allowable stresses based on the ASME boiler and pressure vessel code. In operating condition the results are satisfied with the code limits.