• 제목/요약/키워드: Angular contact ball bearing

검색결과 67건 처리시간 0.028초

Dynamic Characteristics of Indeterminate Rotor Systems with Angular Contact Ball Bearings Subject to Axial and Radial Loads

  • Hong, Seong-Wook;Kang, Joong-Ok;Yung C. Shin
    • International Journal of Precision Engineering and Manufacturing
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    • 제3권2호
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    • pp.61-71
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    • 2002
  • This paper presents the dynamic analysis of indeterminate rotor systems with angular contact ball bearings subject to axial and radial loads. The reaction forces against applied radial loads significantly influence the dynamic characteristics of angular contact ball bearings. However, the reaction forces are hard to determine in the case of indeterminate rotor-bearing systems. To this end, this paper proposes a finite element model for indeterminate rotor systems with angular contact ball bearings. An improved bearing model is adopted which is originated from the Harris's bearing dynamic model. The bearing model is also extended to include centrifugal forces due to the ball and inner ring. This paper utilizes a new iterative algorithm for general, indeterminate rotor systems with angular contact ball bearings. This examples are provided to illustrate the dynamic characteristics of rotor systems with angular contact ball bearings subject to axial and radial loads. The experimental and numerical results prove that the proposed method is useful for the dynamic analysis of indeterminate rotor systems with angular contact ball bearings.

각접촉 볼베어링으로 지지된 스핀들의 정렬오차에 의한 동특성 변화 해석 (Dynamic Analysis of Spindle with Angular Contact Ball Bearings Subjected to Angular Misalignment)

  • 배규현;홍성욱;윤영석
    • 한국생산제조학회지
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    • 제23권4호
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    • pp.368-373
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    • 2014
  • This paper presents the dynamic modeling and analysis results for a spindle supported by angular contact ball bearings (ACBBs) subjected to angular misalignment. Although ACBBs are widely used in spindle systems, their characteristics in regard to angular misalignment have rarely been investigated. A simulation program was developed to calculate the dynamic characteristics of a simple spindle model that is supported by angular contact ball bearings subjected to angular misalignment. Angular misalignment is shown to introduce anisotropy into the angular contact ball bearings and then split the natural frequencies in spindles. Simulations were also performed to show the possibility of evaluating bearing misalignment using natural frequency measurements.

경방향 하중을 받는 스핀들 베어링 계의 동특성 연구 (Study on Dynamic Characteristics of Spindle-bearing System Subjected to Radial Load)

  • 최춘석;홍성욱
    • 한국생산제조학회지
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    • 제22권4호
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    • pp.740-746
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    • 2013
  • Angular contact ball bearings are often adopted for a high-speed spindle owing to their durability against axial and radial loads. The dynamic characteristics of an angular contact ball bearing, however, are very complicated because they are dependent on the applied loads as well as on the system configuration. This study systematically analyzes the radial-load-dependent characteristics of spindles as well as angular contact ball bearings. Toward this end, a spindle dynamic model along with the bearing dynamics model is established. An iterative solution algorithm is implemented to resolve the statically indeterminate problem associated with spindle-bearing systems subjected to radial load. Two numerical examples are provided to investigate the spindle and bearing characteristics as a function of radial load with regard to the system configuration.

각접촉 볼 베어링의 정위치 예압 변화에 따른 회전체 계 동특성 변화 연구 (A Study on the dynamic characteristics of rotor systems supported by angular contact ball bearings with the axial displacement preload varied)

  • 강중옥;홍성욱
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 추계학술대회 논문집
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    • pp.389-392
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    • 1997
  • This paper presents the dynamic analysis and experiment for rotor systems supported by angular contact ball bearings subjected to axial displacement preload. A dynamic software, which has been developed by the authors for the analysis of rotor systems supported by angular contact ball bearings, is used to simulate a uniform shaft system supported by two angular contact ball bearings with the axial displacement preload varied. Experiments are also performed to validate the simulation. An experimental system is constructed which consists of a uniform shaft, two bearings and a device for adjusting the axial displacement preload. Through a series of simulation and experiment, the dynamic characteristics of rotor systems with angular contact ball bearings subject to axial displacement preload are investigated.

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각 어긋남을 고려한 각접촉 볼베어링의 피로수명 해석 (Fatigue Life Analysis for Angular Contact Ball Bearing with Angular Misalignment)

  • 배규현;통반칸;홍성욱
    • 한국정밀공학회지
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    • 제33권1호
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    • pp.53-61
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    • 2016
  • Angular misalignment has a significant effect on the characteristics of angular contact ball bearings (ACBBs). This paper presents an analysis of fatigue life for ACBBs subjected to angular misalignment. A simulation model is developed with de Mul's bearing model and the ISO basic reference rating life model. Simulation is performed to calculate the life of the ACBBs subjected to angular misalignment. The numerical results show that angular misalignment influences the load distribution significantly, thus reducing the bearing rating life. The fatigue life of ACBBs is decreased by angular misalignment regardless of axial preload, external radial load and rotational speed. The results show that angular misalignment should be maintained at less than 1mrad for ACBBs.

고속 주축베어링의 볼 접촉각 변동을 고려한 주축 설계공차 (Design Tolerance of High Speed Spindle considering the Variation of Ball Contact Angle in the Angular Contact Ball Bearings)

  • 이찬홍
    • 한국생산제조학회지
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    • 제19권5호
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    • pp.609-615
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    • 2010
  • 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.

초정밀 앵귤러 컨택트 볼 베어링 개발

  • 현준수;문호근;박태조
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 1998년도 제27회 춘계학술대회
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    • pp.300-306
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    • 1998
  • A high precision angular contact ball bearing is developed by Hanwha Machinery Co. The developed bearing is 7004C with P4 class. The performance test was succeful until 60,000 rpm.

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회전속도에 따른 고속 스핀들의 돌출량 예측에 관한 연구 (Estimation of Axial Displacement in High-speed Spindle Due to Rotational Speed)

  • 배규현;이찬홍;황주호;홍성욱
    • 한국정밀공학회지
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    • 제29권6호
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    • pp.671-679
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    • 2012
  • This paper presents an estimation procedure for axial displacement in spindle equipped with angular contact ball bearings due to rotational speed. High-speed spindle-bearing system experiences axial displacement due to thermal expansion and rotational speed-dependent characteristics of angular contact ball bearings. This paper deals with the axial displacement caused by the rotational speed-dependent effects such as centrifugal force and gyroscopic moments. To this end, a bearing dynamic model is established that includes all the static and dynamic properties of angular contact ball bearing. An analytical formula to calculate the axial displacement based on contact angles between ball and races is derived to discuss the physics regarding the axial displacement in spindle. The proposed dynamic model is compared with a reference and a commercial program. Numerical examples are presented to show the effects of centrifugal force and gyroscopic moment on the axial displacement. The proposed model is also validated with an experimental result.