• 제목/요약/키워드: High Speed Machining Center

검색결과 113건 처리시간 0.029초

흑연소재가공용 공구의 DLC 코팅두께가 가공특성에 미치는 영향 (Effect on Tooling Characteristics to DLC-coated Thickness of Tool for Graphite Material)

  • 윤재호;김형균;최성대
    • 한국기계가공학회지
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    • 제14권5호
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    • pp.22-27
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    • 2015
  • Processing of low toughness graphite material requires high-speed machine tools and DLC coating. In this study, results of investigation of the tool wear and machining properties of the DLC coating according to the thickness, and the machining time of the tool used for the machining of graphite electrodes, were as follows. 1. DLC coating thickness shows a larger wear amount of the tool center in accordance with thickness; the wear amount of the tool increases in proportion to the machining time. 2. The difference between the amount of wear depending on the processing time shows edge portions larger than the tool wear amount in the center. This amount of wear of the tool edge is formed since the rotating torque is in contact with the graphite material surface significantly more than the central portion. 3. The thicker the DLC coating, the more the coating tool eliminated of the coating area by the interface between the cemented carbide tool being coated with an increased friction of the graphite material and the DLC coating area.

금형 가공기의 엔드밀 가공 및 구조 동특성 해석 (Analyses of structural dynamic characteristics and end milling in a vertical machining center)

  • 이신영;김성걸;이장무
    • 한국정밀공학회지
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    • 제14권3호
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    • pp.66-74
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    • 1997
  • In a high speed and high precision vertical machining center, chatter vibration is easily generated due to unbalanced masses in rotating parts and changtes of cutting forces. In this paper, modal test is performed to obtain modal parameters of the vertical machining center. In order to predit the cutting force of endmilling process for various cutting conditions, a mathematical model is given and this model is based on chip load, cutting geometry, and relationship between cutting forces and the chip load. Specific cutting constants of the model are obtained by averaging forces of cutting tests. The interactions between the dy- namic characteristics and cutting dynamics of the vertical machining center make the primary and the secondary feedback loops, and we make use of the equations of system to predict the chatter vibration. The chatter prediction is formulated as linear differential-differene equations, and simulated for several cases. Trends of vibration as radial and axial depths of cut are changed are shown and compared.

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공작기계 주축용 스핀들 전동기 구동에 관한 연구 (A Study on the Spindle Motor Drive for the Spindle of Machining Center)

  • 한영성;안성찬;송종환;이학성
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 F
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    • pp.2110-2112
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    • 1997
  • The induction motor drive for the spindle of machining center is required to do not only a constant torque operation in low speed region(below base rpm), but also a constant power operation in high speed region(beyond base rpm). Also, control voltage shortage due to high speed operation must be overcome. The vector controlled inverter system with input 3 phase pwm converter is designed for that kind of condition. We experimented the performance of the inverter system with spindle motor made by Hyosung industries co.

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고속 라인 스캔 방식을 이용한 CFRP 가공 홀 표면 및 내부 결함 검사 (Measurements of Defects after Machining CFRP Holes Using High Speed Line Scan)

  • 김택겸;경대수;손운철;박선영
    • 한국정밀공학회지
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    • 제33권6호
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    • pp.459-467
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    • 2016
  • Using a line scan camera and a Galvano mirror, we constructed a high-speed line-scanning microscope that can generate 2D images ($8000{\times}8000pixels$) without any moving parts. The line scanner consists of a Galvano mirror and a cylindrical lens, which creates a line focus that sweeps over the sample. The measured resolutions in the x (perpendicular to line focus) and y (parallel to line focus) directions are both $2{\mu}m$, with a 2X scan lens and a 3X relay lens. This optical system is useful for measuring defects, such as spalling, chipping, delamination, etc., on the surface of carbon fiber reinforced plastic (CFRP) holes after machining in conjunction with adjustments in the angle of LED lighting. Defects on the inner wall of holes are measured by line confocal laser scanning. This confocal method will be useful for analyzing defects after CFRP machining and for fast 3D image reconstruction.

$ADAMS^(R)$를 이용한 초고속 스핀들의 회전 밸런싱 (Balancing)에 대한 연구 (A Study on Rotating Balancing of High-speed spindle by using $ADAMS^(R)$)

  • 조영덕;정원지;이춘만;윤상환;황영국;박기범
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 추계학술대회 논문집
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    • pp.560-563
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    • 2005
  • According to the demand of the high productivity, the interest of manufacturing skills is growing in industrial society. Especially the high-speed spindle in machining center becomes important these days. The rotating accuracy of the spindle in machining center concerns the centrifugal force. In detail explaining, it is influenced by the unbalance mass. In this study, we could find changes of the vibration caused by condition (increased mass, rotating speed, position) of unbalance mass and verify it using a software - $ADAMS^(R)$ With this study, it will help workers on the spot solve the problems concerning unbalance mass.

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임펠러 5-축 CNC 가공에 관한 연구 (A Study on The 5-Axis CNC Machining of Impeller)

  • 조현덕
    • 한국생산제조학회지
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    • 제6권4호
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    • pp.19-26
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    • 1997
  • The manufacture of an impeller typically requires the 5-axis CNC machining, since the impeller is usually under working conditions such as high speed, high temperature, and high pressure. Thus, this study contributes to development of an exclusive CAM system for effective 5-axis CNC machining of a ruled surface type impeller. In this study, the sampled impeller is made of blades and a body and the blade consists of ruled surfaces between hub curve and shroud curve. In the post processing for 5-axis NC part program, the cutter axis direction vector is the straighten vector on ruled surface. The position of ball center in ball end mill cutter is decided on the interference check between the cutter and body surface of impeller using with the modified z-map method that z-axis is the same of cutter axis direction vector. The exclusive CAM system for an impeller developed in this study was very effective for designs and 50-axis machining of a ruled surface type impeller.

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가속도 최적화 및 형상 최적화를 통한 수직 컬럼 이동형 머시닝 센터의 진동 저감에 대한 연구 (Study on decreasing displacement of the MC(machining center) moved column with high-speed for optimization of acceleration and DOE(Design Of Experiment))

  • 조영덕;이춘만;윤상환;정원지
    • 한국공작기계학회논문집
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    • 제17권1호
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    • pp.35-42
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    • 2008
  • By the reason of increased demand of high productivity and quality, the manufacturer have an effort in many directions of a machine tool industries. Among there, we proposed method of decreasing displacement in MC(machining center). In other words, Quality related with vibration of a tool cutting products. For decreasing it, improved by optimizing a shape of the column-part and acceleration curves of motors. In this paper we could find design factors has much influence on decreasing the displacement using the DOE(Design of Experiments) and optimized the level of the factors using $ADAMS^{(R)}$ and $MINITAB.^{(R)}$ And we suggest optimized a acceleration curve using $Matlab^{(R)}$.

다구찌 방법을 이용한 초고속 컬럼 이동형 머시닝 센터의 진동 저감 방안 연구 (Study on decreasing displacement of the MC(machining center) moved column with high-speed for the Taguchi method)

  • 정원지;이춘만;조영덕;윤상환
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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    • pp.445-446
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    • 2006
  • By the reason of increased demand of high productivity, the researches on manufacturing process and equipments for reducing cycle time have been made in many directions of a machine tool industries. Among these, this paper proposed method of decreasing displacement in MC(machining center). Factors affecting displacement are a motor mass, head thickness, column thickness and base thickness. In this paper We could find design factors has much influence on decreasing the unclamping time using the Taguchi method and optimized the level of the factors using $ADAMS^{(R)}$.

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공압식 소재물림 가이드부쉬 시스템의 설계 및 가공정도 평가 (Design and Machining Precision Evaluation of Pneumatic Clamping Type Guide-bush System)

  • 이재훈;이수민;박성훈;이시복
    • 한국생산제조학회지
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    • 제19권6호
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    • pp.859-866
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    • 2010
  • Generally, a fixed type guide-bush system is installed during machining miniature work-pieces with high precision in the multi-task CNC lathe. But a conventional guide-bush system does not provide a constant clamping force under the condition of varying work-piece diameters. It is important to maintain a constant clamping force for guaranteeing machining precision. This paper proposes a new guide-bush system with a pneumatic clamping device for the CNC Swiss-turn lathe to keep constant clamping force with changes in work-piece diameters. Through performance tests, new clamping system developed in the study showed better machining precision at the cost of a small increase in the temperature of the system than conventional systems due to an increase in the frictional heat and a change in the heat transfer route.