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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.
CNC 공작기계 장착형 고속스핀들을 이용한 고속가공 실용화 기술
이용철(Yong-Chul Lee),곽태수(Tae-Soo Kwak),김경년(Gyung-Nyun Kim),이종열(Jong-Ryul Lee) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
A newly developed attachment type high-speed spindle can be easily attached to the conventional CNC machining center to allow high-speed machining with low investment costs. This study has focused on the application of a conventional CNC machining center equipped with an attachment type high-speed spindle. A specimen of plastic mold material has been machined to compare the cutting effectiveness of the high-speed machining center and the conventional machining center with the attachment type high-speed spindle respectively. The rotational accuracy of the spindles are measured by a transmission optic measurement system and the surface roughness of the workpiece in accordance with revolution speed(rpm) of the spindle are investigated respectively. As the experimental results, it was shown that the surface roughness of the machined workpiece was 3.42㎛Rmax, 0.46㎛Ra in the case of attachment type spindle and 1.81 ㎛Rmax, 0.275㎛Ra in the case of the high-speed machining center. Moreover, the mean rotational accuracy was 7.57㎛ in the case of the attachment type spindle and 7.39㎛ in the case of the high-speed machining center.
그리스 윤활 고주파 모터 주축의 예압과 냉각에 따른 열특성
최대봉,김수태,정성훈,김용기 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
The important problem in high speed spindle is to reduce and minimize the thermal effect by motor and ball bearings. In this study, the effects of bearing preload and cooling for high speed spindle with high frequency motor are investigated. A high speed spindle is composed of angular contact ball bearings, high frequency motor, grease lubrication, oil jacket cooling, and so on. Heat generation of the bearing and the high frequency motor are estimated from the theoretical and experimental data. The thermal analyses of high speed spindle to minimize the thermal effect and maximize the cooling effect are carried out under the various cooling conditions and preload. Method of variable bearing preload and cooling can be useful to design the high speed motor spindle. The results show that the optimal preload and cooling are very effective to minimize the thermal displacement by motor and ball bearing.
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.
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.
오일에어 윤활 고속모터 주축의 점도 및 유량에 따른 열특성 해석
최대봉,권희돈,김수태,김창용 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 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 characteristic analysis of a oil-air lubricated high speed motor spindle system with angular contact ball bearings and built-in motor. An analysis on the thermal characteristics of spindle is performed according to the cooling oil flow and viscosity by using finite element method. This result can be applied to the design and manufacture of a high speed motor spindle.
오일에어 윤활 고속모터 주축의 점도 및 유량에 따른 열특성 해석
최대봉(D. B. Choi),권희돈(H. D. Kwon),김수태(S. T. Kim),김창용(C. Y. Kim) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.10
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 a oil-air lubricated high speed motor spindle system with angular contact ball bearings and built-in motor. An analysis on the thermal characteristics of spindle is performed according to the cooling oil flow and viscosity by using finite element method. This result can be applied to the design and manufacture of a high speed motor spindle.
장윤혁(Yun-hyeok Jang),김갑순(Gab-Soon Kim) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.5
This paper describes the design of the spindle of a large high-speed machine. Large high-speed machines are designed to have a rotational speed of 10,000 rpm or more and a safety factor of 3 or more to increase the machining efficiency. Therefore, the spindle was modeled, and static structural and modal analyses of the modeled spindle were performed. The results showed that the maximum displacement was within 0.012 mm, the safety factor was greater than 3.2, and the natural frequency was 33.55 Hz. Based on the design results, tests of characteristics such as rotation speed, vibration, and temperature of the manufactured spindle were conducted. As a result of the experiment, the spindle temperature was 21.3 ℃ at a maximum rotational speed of 10,000 rpm, the spindle frequency was 7.96–65.97 Hz, and the spindle noise had a maximum of 81.6 dB, all of which satisfied all the determined spindle specifications. Therefore, the designed spindle can be attached to large-scale high-speed machines.
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.