• 제목/요약/키워드: Roll Characteristics

검색결과 513건 처리시간 0.027초

A Study on the EDT Characteristics of TM Work Roll and Variation of Strip Surface Roughness

  • Kim, Soon-Kyung;Moon-Kyung, Kim
    • KSTLE International Journal
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    • 제2권2호
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    • pp.133-137
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    • 2001
  • This paper investigates the correlation between strip surface roughness and the surface of the work roll. As the actual temper mill(TM) is used, this data will be adopted to another actual temper mill for the application and operation of this experiment. Conclusions are as follows: Electro-discharge texturing(EDT) roll has homogeneous roughness distribution and shape, and also a sinuous peak surface and the life is 2 times longer than that of shot blast texturing(SBT) method. And the higher surface roughness of work roll, the more time is necessary at the EDT method. In the SBT method without the correlation of roughness, but impeller rotation speed with an uncontrollable peak count. The roughness of SBT roll is irregularity compared to that of EDT roll because the work roll roughness is transferred to the strip which was temper rolled, and produces a more desirable image and greater clarity to the color painted steel sheet.

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쌍롤 연속 주조에서의 난류 유동, 온도 및 응고 예측을 위한 연구 (A Numerical Study of Turbulent Flow, Heat Transfer, and Solidification in Twin-Roil Continuous Casting)

  • 하만영;최봉석
    • 대한기계학회논문집B
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    • 제23권1호
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    • pp.12-24
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    • 1999
  • A computer program has been developed for analyzing the two-dimensional, unsteady conservation equations for transport phenomena in the molten region of twin-roll continuous casting in order to predict the turbulent velocity, temperature fields, and solidification process of the molten steel. The energy equation of the cooling roll is solved simultaneously with the conservation equations of molten steel in order to consider heat transfer through the cooling roll. The results show the velocity, temperature and solidification pattern in the molten region with roll temperature as a function of time. The results for velocity and temperature fields with solidification are compared with those without solidification, giving different thermofluid characteristics in the molten region. We also investigated the effects of revolutional speed of roll, superheat and nozzle geometry on the turbulent flow, temperature and solidification in the molten steel and temperature fields in the cooling roll.

롤편심을 포함한 냉간 압연시스템의 두께제어 (Thickness Control of Cold-Rolling Mills with Roll Eccentricity)

  • 김승수;김종식;황이철
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1996년도 추계학술대회 논문집
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    • pp.248-254
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    • 1996
  • A disturbance rejection controller using eccentricity filtering and LQ control techniques is proposed to alleviate significantly the effect of roll eccentricity in multivariable cold-rolling processes. Fundamental problems such as process time delay inherent in exit thickness measurement and non-stationary characteristics of roll eccentricity signals can be overcome by the proposed control method. The filtered instantaneous estimate of roll eccentricity may be exploited to improve instantaneous estimate of the exit thickness variation based on roll force and roll gap mearsurements, and a feedforward compensator is augmented as a reference for a gaugemeter thickness estimator. And, LQ feedback controller is combined with eccentricity filter for the attenuation of the exit thickness variation due to the entry thickness variation. The simulation results show that eccentricity components have been significantly eliminated and simultaneously other distrubances also have been attenuated.

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하이브리드 제어 기법에 의한 승용 차량의 롤 제어 (Roll Motion Control of a Passenger Vehicle Using Hybrid Control)

  • 김효준
    • 한국자동차공학회논문집
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    • 제19권5호
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    • pp.22-28
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    • 2011
  • This paper presents an active roll motion control of a passenger vehicle. The roll controller is designed in the framework of $H_{\infty}$ control scheme based on the 3 DOF vehicle model taking into consideration parameter variations, which affect the roll dynamics, and unmodeled high frequency dynamics for robustness and performance. In order to investigate the feasibility of the active roll control system in a car, its performance is evaluated by simulation in a full vehicle model with nonlinear tire characteristics under various operating conditions. Finally, in order to enhance the performance in a transient region taking into account the limited bandwidth of the actuating module, a hybrid control strategy is presented.

유도가열 히팅롤의 설계와 해석 (Design and Analysis of Induction Heating Roll)

  • 장석명;양현섭;서진호;이성호;박희창;박찬일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 A
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    • pp.263-265
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    • 1998
  • This paper presents a design and Analysis of Induction Heating Roll. Heating roll is one of the induction heating's application, widespread for print, pulp, fiber industry, and so forth. In this paper, at first, treated that heating roll's characteristics equation, design method of heating roll, and then design roll. The second, analysis designed roll using FEM.

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롤투롤 시스템의 와인더 반경 추정을 이용한 와인더 장력의 가변 PID이득 제어 (Variable PID Gain Control of Winder Tension of Roll-to-Roll Printing System using Estimation of Winder-Roll Radius)

  • 박종찬;전성웅;남기상;김충환
    • 한국생산제조학회지
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    • 제22권4호
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    • pp.755-760
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    • 2013
  • The dynamics of the winder roller of a roll-to-roll printing system for printed electronics is a time-varying system because of the variation of the winder roller radius owing to rewinding or unwinding of the web. Therefore, an adaptive control method considering the time-variant characteristics is required for precise tension control. In this study, the variable PID gain method is applied to the actual roll-to-roll system and verified by experiments for unwinder tension control. The required value of the winder roller radius for the application of the variable PID gain is estimated from the measurement of the winder tension and winder motor torque. The simulation results as well as experimental results show that the fixed PID gain control cannot stabilize the tension of the winder roller with varying winder roller radius. On the other hand, the variable PID gain method can control the tension of the winder roller regardless of the winder roller radius.

접압롤을 이용한 권취장력의 비선형 PID 제어 (A nonlinear PID control of winding tension using contact roll)

  • 신기현;김규태;천성민
    • 대한기계학회논문집A
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    • 제21권12호
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    • pp.2029-2037
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    • 1997
  • In a web winding process, the contact roll plays many important roles including air-entrainment control and WIT(Wound In Tension) regulation. The behavior of contact roll significantly affects the winding tension characteristics specifically at the time of contact when the speeds of contact roll and the winding roll are not synchronized. A mathematical model for the web, the winding roll, and the contact roll is derived. By using the model derived, a nonlinear PID(NPID) controller is designed to control the winding tension at the time of contact and separation between the contact roll and the winding roll. Computer simulation study showed that the performance of the winding system with the NPID controller significantly improved compared with that of a system with PID controller.

판스프링의 이력특성이 대형트럭의 조종성능에 미치는 영향에 관한 연구 (A Study on the Effects of Hysteretic Characteristics of Leaf Springs on Handling of a Large-Sized Truck)

  • 문일동;오재윤
    • 한국자동차공학회논문집
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    • 제9권5호
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    • pp.157-164
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    • 2001
  • This paper performs static and dynamic tests of a multi-leaf spring and a tapered leaf spring to investigate their hysteretic characteristics. In the static test, trapezoidal input load is applied with 0.1Hz excitation frequency and with zero initial loading conditions. In the dynamic test, sinusoidal input load is applied with five excitation amplitudes and three excitation frequencies. In these tests, static and dynamic hysteretic characteristics of the multi-leaf spring and the tapered leaf spring are compared, and, the effects of excitation amplitudes and frequencies on dynamic spring rate are also shown. In this paper, actual vehicle tests are performed to study the effects of hysteretic characteristics of the large-sized truck's handling performance. The multi-leaf spring or the tapered leaf spring is used in the front suspension. The actual vehicle test is performed in a double lane change track with three velocities. Lateral acceleration, yaw rate and roll angle are measured using a gyro-meter located at the mass center of the cab. The test results showed that a large-sized truck with a tapered leaf spring needs to have an additional apparatus such as roll stabilizer bar to increase the roll stabilizer due to hysteretic characteristics.

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쿨링용 슬레트 핀 M/C Form Roll의 Roll Stand부 마찰 특성 (The Friction Characteristics of Roll Stand in the Cooling Slat Fin M/C)

  • 최원식;이성용;권주리;진은영;문희준;이인
    • Tribology and Lubricants
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    • 제26권1호
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    • pp.52-55
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    • 2010
  • This study investigates the friction of the roll stands in the high performance multi- holes slate fin machine which pin is using in heat transfer of radiator, oil cooler, inter cooler, condenser and evaporator. The roll stand part is very important to maintain the high performance fin machine. This multi-holes form roll type is the first time in our country so it will be helpful to increases the export and product of heat transfer. It was include the technical of form rolling system which was self development. Then it will be improve the electric home appliances, future motor vehicle device and industrial machine.

Characteristics of flexible indium tin oxide electrode grown by continuous roll-to-roll sputtering process for flexible displays

  • Choi, Kwang-Hyuk;Cho, Sung-Woo;Jeong, Jin-A;Kim, Han-Ki
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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    • pp.605-608
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    • 2008
  • The preparation and characteristics of flexible indium tin oxide electrodes grown on polyethylene terephthalate (PET) substrates using a specially designed roll-to-roll sputtering system for use in flexible optoelectronics In spite of low a PET substrate temperature, we can obtain the flexible electrode with a sheet resistance of 47.4 ohm/square and an average optical transmittance of 83.46 % in the green region of 500~550 nm wavelength. Both x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) analysis results showed that all flexible ITO electrodes grown on the PET substrate were an amorphous structure with a very smooth and featureless surface, regardless of the Ar/$O_2$ flow ratio due to the low substrate temperature, which is maintained by a cooling drum. In addition, the flexible ITO electrode grown on the Ar ion beam treated PET substrates showed more stable mechanical properties than the flexible ITO electrode grown on the wet cleaned PET substrate, due to an increased adhesion between the flexible ITO and the PET substrates.

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