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공작기계용 40,000rpm 고속주축의 정ㆍ동적 해석과 최적설계에 관한 연구
김동현(Dong Hyeon Kim),이춘만(Choon Man Lee),최현진(Hyun Jin Choi) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.1
주축은 공작기계의 핵심요소로서 주축의 정·동적 특성은 공작물의 가공정밀도에 직접적으로 영향을 미친다. 주축의 특성은 축 크기, 베어링 간격, 내장모터의 위치 등에 의해 결정된다. 그러므로 축 크기, 베어링 간격, 모터위치의 선정은 주축 특성을 개선하는데 중요한 요소라 할 수 있다. 본 논문은 40,000rpm 고속주축의 정·동적 해석과 최적 설계에 관한 연구로, 유한요소해석과 최적화를 위한 통계분석을 하였다. 이를 위하여 반응표면법을 사용하여 목적함수와 설계변수를 최적화하였다. 최적화 대상은 주축의 고유진동수의 최대화와 변위의 최소화이다. 설계변수는 축길이, 축직경, 베어링 간격, 모터위치로 선정했다. 최적설계를 통해 도출된 설계안으로 초기모델보다 개선된 결과를 얻을 수 있었고, 본 연구의 결과를 주축 설계에 적용하면 주축의 정·동적 특성 개선에 도움이 될 것으로 기대된다. The spindle is the main component in machine tools. The static and dynamic characteristics of the spindle directly affect the machining accuracy of workpieces. The characteristics of the spindle depend on the shaft size, bearing span, built-in motor location, and so on. Therefore, the appropriate selection of these parameters is important to improve the spindle characteristics. This paper presents the analysis of the static and dynamic characteristics and optimization design of a 40,000-rpm high-speed spindle. Statistical analysis for optimization and finite element analysis were performed. This study uses the response surface method to optimize the objective function and design factors. The targets are the natural frequency and displacement. The design factors are the shaft length, shaft diameter, bearing span, and motor location. The optimized design provides better results than the initial model, and these results are expected to improve the static and dynamic characteristics of the spindle.
최대봉(Dae-Bong Choi),유기한(Ki-Han Yu),김수태(Soo-Tae Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
High speed machining is the core technology that influences the performance of machine tools, and the high speed motor spindle is widely used for the high speed machine tools recently. The important problem in this spindle is to reduce and minimize the thermal effect by motor and bearing. This paper presents the thermal characteristics analysis of a high speed motor spindle system consisted of angular constant ball bearings and built-in motor with oil-jet lubrication. The analysis of thermal characteristic of spindle is performed according to the oil-jet lubrication by using finite element method. This result can be applied to the design and manufacture of the high speed spindle.
최대봉(Dae-Bong Choi),김수태(Soo-Tae Kim),노승국(Seung-Kook Ro),조현택(Hyun-Taek Cho) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
High speed machining is the core technology that influences the performance of machine tools, and the high speed motor spindle is widely used for the high speed machine tools. The important problem in high speed spindle is to minimize the thermal effect by motor and bearing and frequency effect. This paper presents the thermal characteristic analysis and frequency experiment for a high speed spindle considering the flow rate of cooling oil. A high speed spindle is composed of angular contact ceramic ball bearings, high speed built-in motor, oil cooling jacket and so on. The thermal analyses of high speed spindle need to minimize the thermal effect and maximize the cooling effect and they are carried out under the various cooling conditions. Heat generations of the bearing and the high speed motor are estimated from the theoretical and experimental data. To find out the characteristic of vibration, the high speed spindle is excited in operational range. This result can be applied to the design and manufacture of a high speed tapping spindle.
주축회전수 및 절삭력 변화에 따른 주축 인터페이스부 정강성 변화에 관한 연구
황영국(Young-Kug Hwang),정원지(Won-Jee Chung),조영덕(Young-Dug Cho),이춘만(Choon-Man Lee) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
High speed machining has become the main issue of metal cutting. Due to increase of the rotational speed of the spindle, problems, such as the run-out errors, reduced stiffness, must be overcome to improve the machining accuracy. In order to solve the problems, it is important to determine the appropriate clamping unit and tooling system. This paper presents an investigation into an evolution of static stiffness in the main spindle interface. Finite element analysis is performed by using a commercial code ANSYS according to variation of cutting force, clamping force and rotational speeds. From the finite element results, it has been shown that the rotational speed and clamping force mostly influence on the variation of the static stiffness in the main spindle interface.
고속 주축베어링의 볼 접촉각 변동을 고려한 주축 설계공차
이찬홍,Lee, Chan-Hong 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.5
Angular contact ball bearings in a high speed spindles are under the extreme conditions, such as high temperature, big centrifugal force and thrust cutting forces. So, the assembly contacts between spindle shaft and inner ring bearings, bearing housing and outer ring of bearings are occasionally unstable at high speed revolution. Furthermore, the ball contact angle of a bearing, which influence stiffness and lifetime of bearings, are changed according to loads and rotational speed. To analyze internal forces of a bearing under high speed revolution, the ball contact are calculated using nonlinear equations in consideration of rotational speed, thrust loads and raceway form. Diameter increase of inner and outer ring by influence factors, such as internal forces to inner and outer ring, centrifugal force and temperature of inner and outer rings are calculated to establish stable state in bearing assembly in high speed spindle. Finally, contribution ratio of influence factor to assembly design tolerance of inner and outer rings are shown and the stable assembly design tolerance are proposed.
최대봉(D. B. Choi),정다운(D. W. Jung),김수태(S. T. Kim),김창용(C. Y. Kim) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
High speed machining is the core technology that influences the performance of machine tools, and the high speed motor spindle is widely used for the high speed machine tools recently. The important problem in this spindle is to reduce and minimize the thermal effect by motor and bearing. This paper presents the thermal characteristic analysis of cooling existence of rear part. An analysis on the thermal characteristics of spindle is performed according to the cooling oil flow and rpm by using finite element method and experiment. This result can be applied to the design and manufacture of a high speed motor spindle.
고속 주축의 진동 특성 향상을 위한 베어링의 위치 선정
임정숙(J. S. Lim),황영국(Y. K. Hwang),이원창(W. C. Lee),이춘만(C. M. Lee),정원지(W. J. Chung) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
This paper presents analysis of dynamic characteristics of a high-speed milling spindle with a built-in motor. The spindle system with a built-in motor can be used to simplify the structure of machine tools, to improve the machining flexibility of machine tools, and to perform the high speed machining. In this system the shaft is usually assumed as a rigid rotor. In the spindle system design, it is very important to improve modal characteristics, and modal analysis is performed in the first place. Therefore in this paper, on the assumption that supporting bearings of spindle was selected most suitable condition, analyzed dynamic characteristics of a high-speed spindle according to its position. Optimal design was applicated to select most suitable position of bearings. Considered the mass and stiffness effects of the built-in motor"s rotor are analyzed by numerical method. The result shows the natural frequency of 1st bending mode of spindle.
고속 주축에서 클램핑력 및 회전수 변화에 따른 주축 인터페이스 접촉률 변화에 관한 연구 (1)
황영국(Young Kug Hwang),이춘만(Choon Man Lee),정원지(Won Jee Chung) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.3
High speed machining has become the main issue of metal cutting. Due to increase of the rotational speed of the spindle, problems, such as the run-out errors, reduced stiffness, must be overcome to improve the machining accuracy. In order to solve the problems, it is important to determine the appropriate clamping unit and tooling system. This paper presents an investigation into an evolution of contact interval which is the interface between spindle taper hole and tool holder shank of the spindle. Finite element analysis is performed by using a commercial code ANSYS according to variation of clamping forces and rotational speeds. This paper proposed fit tolerance in order to evaluate the effects of clamping force and rotational speed on the contact interval in the spindle interface. From the finite element results, it has been shown that the rotational speed rather than clamping force mostly influence on the variation of the contact interval.
고속 주축베어링의 볼 접촉각 변동을 고려한 주축 설계공차
이찬홍(Chan Hong Lee) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.5
Angular contact ball bearings in a high speed spindles are under the extreme conditions, such as high temperature, big centrifugal force and thrust cutting forces. So, the assembly contacts between spindle shaft and inner ring of bearings, bearing housing and outer ring of bearings are occasionally unstable at high speed revolution. Furthermore, the ball contact angle of a bearing, which influence stiffness and lifetime of bearings, are changed according to external loads and rotational speed. To analyze internal forces of a bearing under high speed revolution, the ball contact angles are calculated using nonlinear equations in consideration of rotational speed, thrust loads and raceway form. Diameter increase of inner and outer ring by influence factors, such as internal forces to inner and outer ring, centrifugal force and temperature of inner and outer rings are calculated to establish stable state in bearing assembly in high speed spindle. Finally, contribution ratio of influence factor to assembly design tolerance of inner and outer rings are shown and the stable assembly design tolerance are proposed.