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토글 조인트장치를 이용한 가변예압장치 개발을 위한 기초 연구
최치혁(Chi Hyuk Choi),차나현(Na Hyeon Cha),이춘만(Choon Man Lee) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.3
To increase the machine accuracy by improving the stiffness of spindle bearings, preload was applied to the spindle bearings. The methods of fixed position preload, convertible preload, constant pressure preload, and variable preload are used to apply the preload to the spindle bearing. The previous studies performed by the author of this study were variable preload methods using rubber pressure and centrifugal force based on mechanical systems. This study proposed a toggle joint mechanism that could be applied to variable preload method using centrifugal force and rubber pressure to increase the preload. Also, a finite element analysis was conducted to predict the deformation of the rubber and change of the preload. And the analysis results showed that the preload by the device using rubber pressure only was increased by the toggle joint mechanism using rubber pressure.
고속스핀들의 고무압을 이용한 가변예압장치 실용화를 위한 기초연구
최치혁(Chi Hyuk Choi),심민섭(Min Seop Sim),이춘만(Choon Man Lee) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.8
One of the most important element technologies for achieving high-precision in machine tool spindle systems is preload technology for the bearing of spindle systems. Fixed position preload, constant pressure preload, conversion preload and variable preload methods have been applied for the spindle systems. In this study, a new variable preload method using centrifugal force and rubber pressure is used for reducing installation costs through simplifying its structure. The main objective of the work is the verification of the operability in a preload device using the rubber pressure by the finite element analysis. It is shown that the variable preload device proposed in this study is applicable to high speed machine tool spindles.
Performance Evaluation of a Variable Preload Spindle by Using Linear Actuator
김동현(Dong-Hyeon Kim),우완식(Wan-Sik Woo),이춘만(Choon-Man Lee),황영국(Young-Kug Hwang) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.8
Bearings having a small clearance during normal operation are selected. In some cases, bearings having a negative clearance when mounted are selected, to generate internal stress which enables achieving various effects. This so-called preload can be applied only to rolling bearings and not sliding ones. The performance of bearings is greatly affected by the applied preload. Application of a heavy preload to enhance the stiffness at the spindle undermines the high-speed rotation performance. In contrast, when a light preload is applied for high speed rotation, the stiffness is undermined. Therefore, a variable preload method is required. This study aims to develop a variable preload device using a linear actuator of the ball screw type, and to perform the performance evaluation of the developed device. Our studies verified that the proposed device worked satisfactorily.
최치혁(Chi Hyuk Choi),김동현(Dong Hyeon Kim),이춘만(Choon Man Lee) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.4
Recently there has been increase in need for high precision and high speed machining due to economic and environmental reasons. It is a very important issue that determines the optimal preload that is to be applied to bearings in order to satisfy the performance required in bearings according to its operation conditions. This study introduces a variable preload device that can automatically adjust the preload applied in a machine tool spindle using centrifugal force as opposed in existing rubber instrument. In this study, the deformation of the rubber device by the centrifugal force is analyzed and it is discussed that the proposed device can be worked properly through changes of the collar density.
소형 고속 고주파 모터 내장형 주축의 미세 예압변화에 따른 열특성
김수태,최대봉,김재실,정동수 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
High speed machining is the core technology that influences the performance of machine tools, and the high frequency motor spindle is widely used for the 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 bearing. In this study, temperature distributions, thermal displacements and stiffness of small sized spindle with variable preload equipment according to slight change of bearing preload are measured for the minimum of thermal effect, and the analyses of thermal characteristic are performed by using finite element method. This results can be applied to the design and manufacture of the high frequency spindle.
소형 고속 고주파 모터 내장형 주축의 미세 예압변화에 따른 열특성
김수태(S. T. Kim),최대봉(D. B. Choi),김재실(C. S. Kim),정동수(D. S. Jeong) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
High speed machining is the core technology that influences the performance of machine tools, and the high frequency motor spindle is widely used for the 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 bearing. In this study, temperature distributions, thermal displacements and stiffness of small sized spindle with variable preload equipment according to slight change of bearing preload are measured for the minimum of thermal effect, and the analyses of thermal characteristic are performed by using finite element method. This results can be applied to the design and manufacture of the high frequency spindle.