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최영휴(Y. H. Choi),장성현(S. H. Jang),김인수(I. S. Kim),조용주(Y. J. Cho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper presents a multi-step design optimization for 5-axes multi-tasking machine using a genetic algorithm. The design problem is to find out thickness of structural members which minimize vibrations, the static compliance, dynamic compliance and weights of the machine structure simultaneously under several constraints such as dimensional constraints, maximum deflection limit, safety criterion and maximum vibration amplitude limit. Optimization results showed a little reduction in compliance and vibration amplitude at the spindle nose of the 5-axes multi-tasking machine in spite of being decreased machine weight.
루프강성을 고려한 5축 복합 가공기 구조물의 형상설계 대안 분석
최영휴(Y. H. Choi),장성현(S. H. Jang),김인수(I. S. Kim),조용주(Y. J. Cho),오창환(C. W. Oh) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this preliminary design study, we have made 10 design modification of a 5-axes multi-tasking machine, which has turning, milling, drilling, tapping, hobbing, and grinding. Furthermore we carried out static and dynamic structural analysis for all the design modifications by using ANSYS. From the analysis results, we could figure out a possible one among the design alternatives. But it is recommended to consider and review other possible machine layouts additionally at detail design stage because our machine having huge size and heavy weight of about 40 tons experiences large static deflection.
암호화 기법을 이용한 재구성 가능형 마이크로 공작기계의 구조형태 창성 방법에 관한 연구
최영휴(Y. H. Choi),장성현(S. H. Jang),김성민(S. M. Kim),김인수(I. S. Kim),박종권(J. K. Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This study presents a new method to generate machine structural configurations of MRmMT (Modular-Reconfigurable micro Machine Tool) systematically in the embodiment design step. The two core approaches to create machine tool structural configurations, in our proposed design method, are cryptographic mapping and machining function proving. Cryptographic mapping approach includes; 1) encoding all the structure modules into binary codes and then storing the graphics and digital codes in the module library, 2) cryptographic operating to create possible combined configurations from any two or several modules by using vector quadratic form expansion of the encoded binary codes, 3) to obtain the resulting structural configurations by decoding the operated binary codes using the module library. Machining function proving is to check up machining ability of a created machine tool configuration. Machining function proving is basically achieved by scalar product of the direction vectors of spindle (or tool) and table (or work piece) modules. Our method was well applied and succeeded in creating feasible machine configurations for a 3-axes reconfigurable micro milling machine from 7 modules spindle, table, bed, column, and 3-translational slide modules.
최영휴(Y. H. Choi),장성현(S. H. Jang),김인수(I. S. Kim),오창환(C. H. Oh),조용주(Y. J. Cho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this paper, dynamic analysis a spindle system for 5-axis multi-tasking machine by using ADROS, which is our own developed S/W for dynamic design analysis of rotor systems. As the result, the critical speed of our spindle system for 5-axis multi-tasking machine is above twice of the operating speed.
재구성 가능형 모듈러 마이크로 공작기계의 구조형태 창성방법에 관한 연구
최영휴(Y. H. Choi),박현만(H. M. Park),장성현(S. H. Jang),박종권(J. K. Park) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
This study describes a new method of constructing reconfigurable machine tool configuration from a set of modules or components. Our method defines module posture vector for each module and mutual connectivity coefficient matrix for adjacent two modules. All of machine configurations possible to be generated from any two combined modules can be determined by quadratic form of two associated posture vectors. Furthermore, all of possible RMT configurations generating from a series of multiple modules also can be obtained by multiplying quadratic form of two adjacent posture vectors consecutively. Finally, machining functionality is checked for all the generated machine confirgurations, and useful machine configurations can be selected.