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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.
고속주축의 냉각조건과 후반부 냉각 유무에 따른 열특성 연구
최대봉(Dae-Bong Choi),김수태(Soo-Tae Kim),이석준(Seog-Jun Lee),김창용(Chang-Yong Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
The important problem in high speed spindle is to reduce and minimize the thermal effect by motor and bearing. This paper presents the thermal characteristic analysis for a high speed spindle with and without cooling at the rear part, considering the viscosity and the flow rate of cooling oil. A high speed spindle is composed of angular contact ceramic ball bearings, high speed built-in motor, oil jacket cooling 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. This result can be applied to the design and manufacture of a high speed motor spindle.
오일-제트 윤활 방식의 모터 분리형 초고속 주축계의 열 특성 해석
김석일,김기태 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.1
This paper presents the thermal characteristics analysis of a high-speed motor-separated spindle system consisted of angular contact ball bearings and built-in motor with oil-jet lubrication. The spindle system is composed of the main spindle and sub-spindle which are mechanically connected by a flexible coupling. The spindles are supported by two front and rear bearings, and the built-in motor is located between the front and rear bearings of the sub-spindle. The thermal analysis model of spindle system is constructed by the finite element method, and the thermal characteristics in the design stage are estimated based on temperature distribution and heat flow under the various testing conditions related to material of bearing ball, spindle speed and coolant temperature.
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.
고속가공에 있어서 공구냉각방법에 따른 듀랄루민의 가공특성에 대한 연구
박은식(Eun-Sik Park),이영민(Young-Min Lee) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.2
Surface roughness of workpiece in high-speed machining is precision of machine economic importance. Using flat end maill, cutting characteristics by the high speed cutting conditions of extra super duralumin were studied experiment. In this study, the effects of high-speed machine spindle speed, feed rate, tool cold method(Compression air and water-soluble cutting oil) on surface roughness investigated by using extra super duralumin. It is found that the surface roughness decreased with spindle speed in high-speed machining of extra super duralumin as is same trend with of other materials
홍준희,신우철 충남대학교 공업교육연구소 2000 論文集 Vol.23 No.1
In high speed spindle system, it is very important to monitor the operation of the spindle to prevent catastrophic damage to the system. Widely used sensors for monitoring are eddy-current and Capacitive types. These sensors provide high accuracy of monitoring, but their steep prices lead to expensive high speed spindle system. The main goal of our research is to develop technology to produce high speed spindle system utilizing magnetic bearings. As active magnetic bearings require position sensors for feedback control, a noncontact position sensor is being developed as a part of this main goal. Once developed, it will contribute to affordable high speed spindle system. In this paper, we report the selection process of the sensor types and the experimental results with driving circuits.
최대봉(D. B. Choi),이석준(S. J. Lee),김수태(S. T. Kim),김창용(C. Y. Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
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. The thermal characteristics for a high speed spindle using oil air lubrication is tested and analyzed according to the rotation speed. This result can be applied to the design and manufacture of a high speed motor spindle.
예압과 냉각방식에 따른 고속주축의 온도분포 및 열변형 해석
김수태,김재실,최대봉,김진한,정동수 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
The use of high speed motor spindle is increasing for high speed machine tools recently. The important problem in the high speed spindles is to reduce and minimize the thermal effect by the motor and ball bearings. Thermal characteristics according to the bearing preload, hollow shaft and oil jacket cooling are studied for the spindle with the oil mist lubrication and high frequency motor. In this study, temperature distribution and thermal deformation are analyzed by using the numerical method This results show that temperature distribution and thermal deformation of the high speed spindle system can be estimated reasonably by using the three dimensional model through the finite element method and support thermal optimization and more effective cooling method.
내부 모터의 공기 냉각에 따른 고속 모터주축의 열특성 해석
최대봉,권희돈,김수태,김창용 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 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 was studied the air cooling effects between motor and bearings according to the air flow rate for the high speed motor spindle. This result can be applied to the design and manufacture of a high speed motor spindle to reduce the thermal displacement and temperature rise.
강순준,이갑조,김종관 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
High speed precision machines have been introduced to the CNC industry in order to improve productivity, shorten the appointed date of delivery and reduce the prime cost. High speed machines have more functions then general machines, and they were proved in performance. The production and sales of the high speed machines have been increased not only in domestic market but also all over the world. Accordingly, machines are faster, there are lots of problems to be solved. One of the most difficult problems is the thermal displacement on the main spindle due to generated heat while the spindle is rotated in high speed. Since the thermal displacement directly effects the quality of the machined parts, utmost efforts to minimize the thermal displacement have to be given from the beginning of designing machines. In practice, variety of methods are attempted and practiced to minimize the thermal displacement such as design of symmetrical frame, adoption of high speed bearings, application of compensation system using non-contact sensor and use of forced circulating lubrication system with oil cooler. Even if these variable methods have been practically used in the industrial field, generated heat has not been perfectly prevented. Hence, in this paper, the characteristics of thermal displacement were investigated when several kinds of oil were tested for a high speed machine with forced circulating lubrication system within the same atmosphere and under the same conditions.