• Title/Summary/Keyword: High speed spindle

Search Result 416, Processing Time 0.032 seconds

Analysis Of The Thermal Behavior and Jacket Cooling Characteristics of Motor Integrated Spindle for High Speed Machine Tool (고속공작기계용 모터내장형 주축의 열거동 및 자켓냉각특성 해석)

  • Park, D.B.;Kang, J.P.;Song, J.B.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.14 no.2
    • /
    • pp.33-40
    • /
    • 1997
  • Recently, there are an increasing needs for high speed rotating spindle which is an important mechanical ele- ment for a high efficiency machine tool in order to shorten machining time and cut production costs. The heat gen- eration is the most important problem in the motor integrated spindle. In this study, the effects of temperature distribution and thermal behavior according to the oil-air lubrication and cooling conditions are investigate theo- retically and experimentally on the motor-integrated spindle under unloading condition. The experimental spin- dle system is composed with the angular contact steel ball bearings, oil-air lubrication, air or oil jacket cooling system. To analyze the thermal behavior and cooling characteristics for the motor integrated spindle, the analysis using the finite element method is carried out. The analytical results are compared with the experimental results.

  • PDF

Thermal Characteristics Analysis of a High Speed Spindle System by Using FSI Method (FSI 해석법을 이용한 고속 주축계의 열특성 해석)

  • Kim, Soo-Tae;Lee, Seog-Jun;Choi, Young-Hyu
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.13 no.3
    • /
    • pp.83-88
    • /
    • 2014
  • FSI (Fluid Structure Interaction) method, in this study, has been applied to analyzing thermal characteristics of a high speed machine tool spindle system. The spindle is composed of angular contact ceramic ball bearings, a high speed built-in motor, a cooling jacket, and so on. The cooling jacket has three inlets and outlets. Using the FSI method, temperature distributions and thermal displacements of the spindle system were computed considering the heating of the front and rear bearings and the built-in motor. The results computed using the FSI method were compared with those determined by experiment and using the conventional numerical approach. The results determined using the FSI method were similar to those from the conventional numerical approach but showed better agreement with the experimental results. Therefore, it is concluded that the FSI method is useful for analyzing the thermal characteristics of high speed spindles and can be applied to the design of high speed spindles.

Design of a Magnetic Bearing System for a High Speed Grinding Spindle (연삭기용 자기베어링 주축계의 고속화에 관한 연구)

  • 박종권;노승국;안대균
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.15 no.11
    • /
    • pp.233-243
    • /
    • 1998
  • The demand of high speed machining is increasing due to the high speed cutting and grinding provides high efficiency of process, short process time, improved metal removal capacity and better surface finish. Active magnetic bearings allow much high surface speed than conventional ball bearings and therefore greatly suitable for high speed cutting or grinding. This paper describes a design process of an active magnetic bearing system for a high speed grinding spindle with power 5.5kW and maximum speed 60,000rpm. Magnetic actuators are designed by the magnetic circuit theory considering static load condition, and examined with FEM analysis. Dynamic characteristics are also considered, such as bandwidth, stiffness, natural frequency and static deflection. System characteristics are simulated with a rigid rotor model.

  • PDF

Thermal Characteristics Analysis of High Speed Spindle of CA Frame Equipment for Eyewear (CA안경테 가공장비 주축의 열특성 해석)

  • Choi, Hyun-Jin;Choi, Seong-Dae
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.10 no.5
    • /
    • pp.31-37
    • /
    • 2011
  • For the domestic glasses industry to procure competitiveness in the world CA(Cellulose Acetate) frame of spectacles market, CNC machining system for CA frame including high-value added CA cutting technologies should be developed with new materials for the rim based on Cellulose and sheet manufacturing base. The spindle system of glasses frame equipment that is the core to the quality of CA frame is the key technologies to realize high-speed, high-precision so its importance is remarkably emerging. In the study, at the structural design of the high spindle system of the private equipment for CA glasses frame embedded a motor of 40,000rpm, the stability of design was analyzed and investigated through selecting lubrication structure and thermal characteristics of the spindle system.

Improvement of a Stiffness for High-Speed Spindle Using the Taguchi Method (다구찌 방법을 이용한 고속주축의 강성 개선)

  • Lim, Jeong-Suk;Chung, Won-Jee;Lee, Choon-Man;Lee, Jung-Hwan
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.24 no.2 s.191
    • /
    • pp.127-133
    • /
    • 2007
  • 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. To improve the competition power of price to quality, spindle design is very important. Because it possesses over 10 percent of machine tool's price. The latest machine tools have rotational frequency and excellent about might and precision cutting. So it requires static and dynamic strength in the load aspect. In conclusion, the deformation of the spindle end have to extremely small displacement in static and dynamic load. In this study, On the assumption that the bearings that are supporting 24,000rpm high-speed spindle are selected in the most optimum condition, the natural frequency and deformation of the spindle end is obtained by FEM mode analysis. The Taguchi Method was used to draw optimized condition of bearing position and it's stiffness.

Thermal Analysis of a Motor-Separated Spindle System for High-Speed HMC (모터분리형 초고속 머시닝센터 주축계의 열특성 해석)

  • 김석일;권태균;나상준
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2001.10a
    • /
    • pp.237-242
    • /
    • 2001
  • This paper presents the thermal characteristics analysis of a high-speed HMC spindle system with angular contact ball bearings, built-in motor, oil-jet lubrication method, oil jacket cooling method, and so on. 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, heat flow and thermal deformation under the various testing conditions related to material of bearing ball, spindle speed and coolant temperature.

  • PDF

Thermal Characteristics Analysis of a High-Speed HMC Spindle System (초고속 HMC 주축계의 열특성 해석)

  • 김석일;김기상;김기태;나승표
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2001.04a
    • /
    • pp.441-446
    • /
    • 2001
  • This paper presents the thermal characteristics analysis of a high-speed HMC spindle system with angular contact ball bearings, built-in motor, oil-jet lubrication method, oil jacket cooling method, and so on. 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.

  • PDF

Comparison of Approximation and Rotordynamics Solutions for Design of a High Speed Air Spindle (고속 공기 스핀들 설계를 위한 근사해석과 회전체동역학의 비교)

  • Lee, Jae Hyeok;Park, Sang-Shin
    • Tribology and Lubricants
    • /
    • v.35 no.5
    • /
    • pp.310-316
    • /
    • 2019
  • This paper presents two methods for designing a high-speed air spindle operated over the rotational speed of 50,000 rpm. The first method is an approximate method, which assumes a symmetric spindle shape even though it is not symmetric in reality. The second is an analysis of rotordynamics using beam and solid models. The approximate method can be used to calculate the bearing load capacities, stiffness and damping coefficients, stability of the shaft system, and response of the forced excitation from the unbalanced mass. Designers can use this method to determine the dimensions of the desired spindle at the first stage of the design. The more detailed behavior of the spindle can be calculated using the rotordynamics theory using beam and solid models based on the Finite Element Method. In this paper, a spindle, with two air bearings, one motor at the end, and two air thrust bearings, is newly developed. The solutions from the two rotordynamics theories are compared with the solution obtained using the approximate method. The three calculations are in agreement, and the procedure for the design of a spindle system, supported on the externally pressurized air bearings, ispresented and discussed.

Thermal Characteristics of the High Frequency Motor Spindle according to the Bearing Preloads and Cooling Conditions (예압과 냉각조건에 따른 고주파 모터 내장형 주축계의 열특성)

  • Choi D. B.;Kim S. T.;Jung S. H.;Kim J. H.;Kim Y. K.
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2005.05a
    • /
    • pp.138-143
    • /
    • 2005
  • 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 and hollow shaft cooling are studied for the spindle with the oil mist lubrication and high frequency motor. Temperature distribution and thermal deformation according to the spindle speed, preload and flow rate are measured by thermocouple and gap sensor. Temperature distribution and thermal deformation are analyzed by using the finite element method. The results of analysis are compared with the measured data. This paper show that the suitable preload and hollow shaft cooling are very effective to minimize the thermal effect by the motor and ball bearings. This study indicates 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 supports thermal optimization and more effective cooling method.

  • PDF

Static/Dynamic/Thermal Characteristics Analysis of a High-Speed Spindle System with 50,000rpm (50,000rpm급 초고속 주축계의 정적/동적/열적 특성 해석)

  • 김석일;조재완;이원재;이용희
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2003.04a
    • /
    • pp.494-499
    • /
    • 2003
  • This paper concerns the static, dynamic and thermal characteristics analysis of a high-speed spindle system for horizontal machining centers with 45mm x50,000rpm. The spindle system is designed based on the angular contact ceramic ball bearings, built-in motor, oil-air lubrication method and oil jacket cooling method. The structural and thermal analysis models of spindle system are constructed by the finite element method. The static and dynamic characteristics are estimated based on the static deformation, modal parameter, mode shape and frequency response function, and the thermal characteristics are estimated based on the temperature rise, temperature distribution and thermal deformation. The analysis results illustrate that the designed spindle system has excellent structural and thermal stabilities

  • PDF