• Title/Summary/Keyword: High speed machine

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Design of High Speed Motor for Surface Mounted Permanent Magnet (표면부착형 영구자석 초고속 회전기의 설계)

  • Song, Jae-Hong;Cha, Young-Bum;Yang, Hyun-Sub;Lee, Jeong-Jong;Hong, Jung-Pyo
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.939-941
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    • 2003
  • High Speed permanent magnet machines are currently being developed for a number of applications including gas turbine power plants, air conditioning systems, machine tools, gas pumps, high performance vacuum pumps, flywheel energy storage systems, aircraft fuel pumps, and so on. Using a high-speed machine eliminates the necessity of the mechanical gearbox and could certainly increase the system efficiency and reduce the total cost. In addition, a high-speed machine has the advantage of small dimension and low weight, i.e. low weight to power and volume to power ratio. This paper presents a review of some important applications (mostly still under development) where high-speed machines arc used, highlighting the advantages of the technology in each case.

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Development of High Speed & Precision Mould/Die Machining Center (고속.고정밀 금형가공센터 개발)

  • 최원선;김태형;이재윤
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.87-94
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    • 2002
  • In order to manufacture a precision mold/die by machining, users need high speed & precision mold/die machining center. So, for development of this machine, we intend to use linear motor that is instead of ball-screw, servo-motor and coupling, high-speed spindle of pressurized air journal bearing and composite materials. In this paper we research column moving type and table moving type. The former is mainly piling 3 axes on one moving body, the latter is consist of two independent carriages. Both types are available to high speed & precision machine, but we finally draw a conclusion column moving type due to an advantage of high-speed control of linear motor.

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The development of the high speed & intellectual Line Center (초고속 Line Center의 구조설계에 관한 연구)

  • 송희남;유태봉;강경호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.10a
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    • pp.479-482
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    • 2000
  • To complite the high speed cutting system, It should be solved some problems, to make light the weight of mechanism for feedrate, develop the Linear motor that bas more power, high speed control system, and high speed cutting tools, nowadays, although many high speed cutting machine is to be built by some machine maker ,they have same problems, in this study, developed the system ball screw type before the feedrate mechanism for linear motor ,so we make the basic system for Line Cents . through that, it is limited to reduce the weight of frame and their frame is to be designed differently each other to reach the purpose special material or strucutre should be contrived.

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Development of High Speed & Precision Mould/Die Machining Center III (고속.고정밀 금형가공센터 개발 III)

  • 최원선;이창호;박보선;김태형
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.10a
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    • pp.429-435
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    • 2002
  • In order to manufacture a precision mold/die by machining, users need high speed & precision mold/die machining center. So, for development of this machine, we intend to use linear motor that is instead of ball-screw, servo-motor and coupling, high-speed spindle of pressurized air journal bearing and composite materials. In this paper we research column moving type and table moving type. The former is mainly piling 3 axes on one moving body, the latter is consist of two independent carriages. Both types are available to high speed & precision machine, but we finally draw a conclusion column moving type due to an advantage of high-speed control of linear motor.

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A Study on the Friction of Tire Tread Rubber using High-Speed Friction Test Machine (고속 마찰 특성 평가시험기 개발을 통한 타이어 트레드 고무의 마찰에 관한 연구)

  • Lee, Jin Koo;Lee, Dong Ju
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.6
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    • pp.622-628
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    • 2013
  • Due to the development of compounding technology, there is a considerable increase in the number of high performance rubbers in the world. Accordingly, there are rapid growing requests about high performance tires such as UHP tire and Run-flat tire. However, it is extremely difficult to investigate the friction coefficient of tire tread rubbers. An alternative solution must be developed with the reliability of high-speed linear friction test machines. The use of friction test machines can be expected to improve rubber friction researches. In this paper, we propose a new kind of high-speed linear friction test machine. We have designed and manufactured various mechanisms for friction tests. The final goals are to design and manufacture friction test machines that can investigate friction coefficients efficiently and rapidly. The performance of the proposed high-speed linear friction test machine is evaluated experimentally; however additional study should be necessary for safer and more reliable experimentation.

Design and Experimental Verification of an Interior Permanent Magnet Motor for a High-speed Machine (고속회전기 적용을 위한 매입형 영구자석 전동기의 설계 및 검증)

  • Kim, Sung-Il;Hong, Jung-Pyo;Lee, Woo-Taik;Choi, Chin-Chul;Kwon, Hyuck-Roul;Park, Jeong-Hee
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.857_858
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    • 2009
  • On account of small size and light weight, a high-speed machine is regarded as a key technology for many future applications of drive systems. In high-speed applications, permanent magnet (PM) synchronous motors have a number of merits such as high efficiency and high power density. Accordingly, they are suitable for driving the air-blower of a fuel cell electric vehicle (FCEV) where space and energy savings are critical. Particularly, a surface-mounted PM motor of them is mainly used as a high-speed machine. However, the motor has a fatal flaw owing to a retaining can to maintain the mechanical integrity of a rotor assembly. The can results in the increase of magnetic air-gap length in the surface-mounted PM motor. Thus, in this paper, an interior PM motor is designed in order to drive the air-blower of FCEV instead of the surface-mounted PM motor, and the experimental results of two models are compared to verify the capability of the interior PM motor for a high-speed machine.

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Thermal Behavior Analysis of Machine Tool Structures using a Predictor-Corrector Method (공작기계구조물의 열적 거동 해석에 관한 연구)

  • 이영우;성활경
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.78-81
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    • 2002
  • To achieve high precision machine totals with high speed, it is needed to develop excellent rigidity statically, dynamically and thermally as well. In this view the chief things that thermal deformation of machine tool structure is directly related to high precision. And thermal behavior for transmission procedure have an effect on high precision. It is needed to exact temperature distribution of each members and all contact elements included for machine tool structure. This paper deals with thermal behavior caused by temperature variation in a high speed feeding process. At this procedure of temperature distribution is estimated using a Predictor-Corrector Method.

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Characteristics Evaluation of Spindle Thermal Displacement with kinds of Lubrication Oil (윤활유 종류에 따른 주축 열변위의 특성 평가)

  • 강순준;이갑조;김종관
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.04a
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    • pp.93-98
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    • 2003
  • 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 lienee, 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.

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Characteristics Evaluation of Spindle Thermal Displacement with kinds of Lubrication Oil (윤활유 종류에 따른 주축 열변위의 특성 평가)

  • 강순준;이갑조;김종관
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.2
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    • pp.47-53
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    • 2004
  • 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.

Thermal Characteristics and Frequency Analysis of a High Speed Spindle for Small Tapping Center (소형 태핑센터 주축의 열특성 및 주파수 분석)

  • Choi, Dae-Bong;Kim, Soo-Tae;Ro, Seung-Kook;Cho, Hyun-Taek
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.2
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    • pp.105-111
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    • 2012
  • 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.