• Title/Summary/Keyword: high-speed spindle

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HVOF Spray Coating of Co-alloy(T800) for the Improvement of durability of High Speed Spindle (초고속 회전체의 내구성향상을 위한 Co-alloy(T800)의 초고속 용사코팅)

  • Cho, Tong-Yul;Yoon, Jae-Hong;Kim, Kil-Su;Youn, Suk-Jo;Back, Nam-Ki;Park, Byung-Chul;Chun, Hui-Gon
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.6
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    • pp.32-37
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    • 2006
  • Micron size Co-alloy(T800) powder was coated on Inconel 718 by HVOF thermal spraying for the studies of the improvement of durability of high speed spindle by using Taguchi program for the parameters of spray distance, flow rates of hydrogen and oxygen and powder feed rate. The optimal coating process was determined by the studies of coating properties such as micro-structure, porosity, surface roughness and micro hardness. Friction and wear behaviors of coatings were investigated by sliding wear test at room temperature and $1000^{\circ}F(538^{\circ}C)$. At both room temperature and $538^{\circ}C$ the sliding wear debris and friction coefficients of the coating were drastically reduced compared with the surface of non-coated parent material. This shows that Co-alloy powder coating is highly recommendable for the durability improvement surface coating of high speed air-bearing spindle. At high temperature wear traces and friction coefficients of both coating and non-coating were drastically reduced compared with those of room temperature since the brittle oxides were formed easily on the surface, and the brittle oxide phases were attrited by the reciprocating sliding wear according to the complicated mixed wear mechanisms These oxide particles, partially melts and the melts play role as lubricant and reduce the wear and friction coefficient. This also shows that Co-alloy powder coating is highly recommendable far the durability improvement surface coating on the surface vulnerable to frictional heat such as high speed spindles.

Auto fitting of motor gains for high speed tapping (고속 텝 가공(tapping)을 위한 자동 이득(gain) 조정기)

  • 최진욱;유완식
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.660-663
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    • 1996
  • There has been many activity to increase accuracy in machining center by reducing tracking error. The tracking error can cause bad effect in high speed rigid tapping in which syncronization servo motor with spindle is relatively important. To reduce tracking error, feed forward control has been used, but no method is provided knowing motor dynamics, force variation, etc. In this paper, we observe that, despite of tracking error of relevant axis, high speed tapping could be possible by reducing contour error of axis to be syncronized. We present the method to increase accuracy in high speed tapping to minimize contour error by automatically fitting gains of servo and spindle.

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An Experimental Study on the Vibration of the Spindle Unit of a High Processing Machine (고속 가공기 스핀들의 진동에 관한 실험적 연구)

  • Choe, Yeong-Ho;Kim, Gwang-Yeong;Choe, Byeong-O
    • 연구논문집
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    • s.31
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    • pp.77-88
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    • 2001
  • In this paper, the critical vibration limits of a spindle unit for a high speed ball pen tip processing machine are studied. The vibration of the spindle is measured by FFT, and the influence of the vibration amplitude due to unbalance, bearing deflect, bite, and timing belts tension is analyzed. The critical vibration limits of the spindle is determined by the X, and Z directional vibrations of the spindle. Both FET and RMS values can be used to analyze the vibration characteristics of the spindle. From experimental results the limit line can be drawn for the spindle. The RMS value for the vibration limit is 3 G.

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A Study on the Solution About Generating Problems in the Spindle Using DMADOV Technique of the Six-Sigma (6시그마의 방법론의 DMADOV 기법에 의한 스핀들에 발생하는 문제 해결 방안에 대한 연구)

  • Cho, Young-Duk;Chung, Won-Jee;Lee, Choon-Man
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.6
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    • pp.15-20
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    • 2007
  • Recently the machine industry is rapidly advanced for improving productivity. Especially an effort decreased error factors of machine tool continuously is being studied. In this paper, we propose a method that decreased vibration in the high speed spindle. By appling 6-sigma technique(DMADOV), we can grasp the influence between the housing design and a rotation accuracy. For a correct conclusion, we measure an actual spindle and analysis by $ARMD^{(R)}$(rotation analysis program). inally we find out influenceable design factors and the improvement condition about 20.7%.

A Study on Chatter Stability of High Speed Spindle (고속 스핀들의 채터 안정선도)

  • Shin, Seong-beom;Lee, Hyun-Hwa;Kim, Ji-S.;Kim, Ji-Yong;Yang, Min-Yang
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.19 no.3
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    • pp.340-345
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    • 2010
  • This paper presents the chatter stability lobes of high speed spindle of five-axis machine tools. Using a FEM, we obtained the frequency response function of a spindle and the stability lobes for evaluation of chatter. In addition, this paper suggest FRF using by FEM for the prediction of chatter stable region and critical cutting depth. Therefore, critical cutting depth of is 1.3586mm and X, Y direction's chatter frequency is 901Hz and 900Hz, respectively.

Tapping Machine of World′s Fastest Speed (초고속 태핑머신 개발)

  • 김선호;김동훈;김선민;이돈진;이선규;안중환;이상규
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.382-386
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    • 2002
  • The tapping is machining process that makes a female screw on the parts to be assembly together. It is used for the high-speed tapping machine with synchronizing function for the high productivity. This paper describes the development of the ultra high-speed tapping machine with 10,000rpm. The key factors in the tapping speed are the acceleration/deceleration velocity and the synchronizing errors between the spindle motor and feeding motor. To minimizing acceleration/deceleration time, the low inertia spindle with synchronous built-in servo motor is developed. To minimizing synchronizing errors, the tapping cycle algorithm under open architecture CNC environment is optimized. The developed tapping machine has 0.13sec/10,000rpm in acceleration/deceleration time and the synchronizing error below 4.0%. It has 0.55sec for cycle time of one female screw, M3 tap, 2 times depth of tap diameter.

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Thermal Characteristic Analysis of a High-Speed HMC with Linear Motor and Magnetic Bearing (리니어모터와 자기베어링을 채용한 초고속 HMC의 열특성 해석)

  • Kim, S. I.;Lee, W. J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.11-15
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    • 2002
  • This paper presents the thermal characteristic analysis of a high-speed HMC with spindle speed of 50,000rpm. The spindle is supported by two radial and axial magnetic bearings. and the built-in motor is located between the axial and rear radial magnetic bearings. The X-axis and Y-axis feeding systems are composed of linear motor and linear motion guides, and the Z-axis feeding system is composed of servo-motor, ballscrew and linear motion guide. The thermal analysis model of high-speed HMC is constructed by the finite element method, and the thermal characteristics in the design stage are estimated based on the temperature distribution and thermal deformation under the conditions related to the heat generation of built-in motor, magnetic bearings, linear motors, servo-motor, ballscrew, and so on.

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A study on Sensorless Vector Control for Spindle Induction Motor (스핀들용 유도전동기 센서리스 벡터제어에 관한 연구)

  • Park, S.H.;Yoon, J.M.;You, J.S.;Shin, S.C.;Won, C.Y.;Choi, C.;Lee, S.H.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2004.05a
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    • pp.119-124
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    • 2004
  • A new control method of spindle induction motor drive is proposed in this paper. In a conventional control method, the vector control was employed in the low speed range, while the constant V/f(volt-per-hertz) PWM control was employed in the high speed range. The two control modes were automatically selected at an intermediate speed. In a proposed control method, the direct vector-control with an encoder is employed in the low speed range(from 0 to 8,000rpm), and the vector control without an encoder is employed in th high speed(from 8,000 to 15,000rpm) by using flux observer and speed estimator. This paper describes problem of control method in a conventional spindle induction motor drive and proposes contort method as variation of motor speed.

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A Study on the Structural Analysis of the Spindle of Swiss Turn Type Lathe for Ultra Precision Convergence Machining (초정밀 융합가공을 위한 주축이동식 자동선반의 구조해석에 관한 연구)

  • Park, Myung-Kyu;Lee, Bong-Gu
    • Journal of the Korea Convergence Society
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    • v.9 no.5
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    • pp.145-150
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    • 2018
  • In the machine tool spindle, various tasks ranging from roughing to finishing must be possible, and the functions of constant speed movement or rotation positioning must be performed. Therefore, there are many variables to be considered in the spindle design. The Swiss Turn Type spindle automatic lathe is a good machine tool for working pins with thinner shafts than a fixed automatic lathe. The Swiss Turn Type spindle is mainly used for precision machining of small products, so the machining precision should be high. The maximum outer diameter limit shall be Ø32 and the inner diameter limit shall be Ø6. In this study, the static and dynamic characteristics of the SCM440 material used in the spindle type automatic lathe were analyzed by applying it to the Swiss turn type spindle automatic lathe. Numerical analysis was used to obtain optimal design technique with high speed and high accuracy considering the factors affecting the static and dynamic characteristics of the spindle.

Inertia Identification Algorithm for Spindle Motor of Machine Tool (고성능 절삭 추력을 위한 스핀들 전동기의 최대토크운전 분석)

  • Kwon, Wan-Sung;Kim, Young-Sik;Cao, Qinbo;Choi, Gyu-Ha
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.37-39
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    • 2007
  • This paper compared with field weakening operation methods for the spindle motor of machine tool in which high speed drive is required. The maximum torque field weakening algorithm ensures the full utilization of the output torque capability of the machine over 1/Wr method. From simulation, the validity of the Max_Te method is confirmed. It is verified that the Max-Te algorithm provided the improved torque capability over 1/Wr method. So, It is applicable to provide high performance control involving fast acceleration and precise speed control for the adjustable speed drive system of spindle.

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