• 제목/요약/키워드: plate rolling

검색결과 178건 처리시간 0.027초

An Approximate Model for Predicting Roll Force in Rod Rolling

  • Lee, Youngseog;Kim, Hong-Joon
    • Journal of Mechanical Science and Technology
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    • 제16권4호
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    • pp.501-511
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    • 2002
  • This paper presents a study of the effect of rolling temperature, roll gap (pass height), initial specimen size and steel grades of specimens on the roll force in round-oval-round pass sequence by applying approximate method and verifications through single stand pilot rod rolling tests. The results show that the predicted roll forces are in good agreement with the experimentally measured ones. The approximate model is independent of the change of roll gap, specimen size and temperature. Thus, the generality of the prediction methodology employed in the approximate model is proven. This study also demonstrates that Shida's constitutive equation employed in the approximate model needs to be corrected somehow to be applicable for the medium and high carbon steels in a lower temperature interval (700∼900$\^{C}$).

압연 중 급준도 모델 개발 (Development of Wave Prediction Model in Flat Rolling)

  • 김진석;황상무
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2009년도 제7회 압연 심포지엄
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    • pp.48-51
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    • 2009
  • Excessive wavy surfaces formed by a cold or hot-rolling process in a thin plate degrade the value of the plate significantly, which is called flatness problem in the industry. It is a result of post-buckling due to the residual stress caused by the rolling process. A unique difficulty of the problem as a buckling problem is that the buckling length is not given but has to be found. a new approach is developed to solve the flatness problem by extending a classic post-buckling analysis method based on the energy principle. The approach determines the buckling length and amplitude. The new solution approach can be used to determine the condition for the maximum rolling production that does not cause the flatness problem.

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후판압연에 있어서의 변형률 분포예측에 관한 연구 (Study for Prediction of Strain Distribution in Heavy Plate Rolling)

  • 문창호;이덕만;박해두
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2007년도 추계학술대회 논문집
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    • pp.96-99
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    • 2007
  • The microstructure with fine and uniform AGS(austenite grain size) along thickness direction over no recrystallization temperature is strongly required for production of the high strength steels. The previous AGS prediction only based on the average strain improves to find the rolling conditions for accomplishment of the fine grain, but cannot find those for uniform grain. In this paper, an integrated mathematical model for prediction of the strain distribution along thickness direction is developed by carrying out finite element simulation for a series of rolling conditions. Also, the AGS distribution after rough rolling is predicted by applying the proposed model with AGS prediction model.

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맞대기 용접 강판재에서 압연 및 잔류응력에 의한 피로거동 (Fatigue Behavior with Respect to Rolling and Residual Stress in Butt-welded Steel Plate)

  • 이용복;오병덕;김성엽
    • 대한기계학회논문집A
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    • 제30권7호
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    • pp.826-832
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    • 2006
  • For the improvement of safety and endurance in welded steel structure, it is needed to consider welding residual stress distribution and rolling directional characteristics of materials. In this study, it was investigated experimentally about characteristics of fatigue crack propagation according to welding residual stress and rolling in FCAW(flux cored arc welding) butt-jointed steel plates. SS400 steel plates of 3mm thickness were selected and tested for this study. When the angles between tensile loading direction and rolling direction in welded materials are increased from $0^{\circ}\;to\;90^{\circ}$, their fatigue crack propagation rates are increased. These results are same as predicted increments of fatigue crack propagation rate when stress ratio is increased from 0 to 0.5. When the angles of rolling direction and welding direction to tensile loading direction are $0^{\circ}\;and\;90^{\circ}$ respectively, fatigue crack propagation rate in welded material is lowest.

압연 및 용접방향이 같은 맞대기 용접강판의 하중방향에 따른 피로균열 진전특성 (Characteristics of Fatigue Crack Propagations with Respect to Loading Directions in Butt-Welded Steel Plates with the Same Direction of Rolling and Welding Bead)

  • 이용복;김성엽;오병덕
    • Journal of Welding and Joining
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    • 제23권6호
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    • pp.37-42
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    • 2005
  • Most of the welding steel plate structures have complicated mechanical problems such as rolling directional characteristics and residual stresses caused by manufacturing process. For the enhancement of reliability and safety in those structures, therefore, a systematic investigation is required. SS400 steel plate used for common structures was selected and welded by FCAW butt-welding process for this study, and then it was studied experimently about characteristics of fatigue crack propagations with respect to rolling direction and welding residual stress of welded steel plates. When the angles between rolling direction and tensile loading direction in base material are increased, their ultimate strength not show a significant difference, but yielding strength are increased and elongations are decreased uniformly. It is also shown that fatigue crack growth rate can be increased from those results. When the angles between welding bead direction and loading direction in welded material are increase, fatigue crack growth rate of them are decreased and influenced uniformly according to the conditions of residual stress distribution. In these results, it is shown that the welded steel plate structures are needed to harmonize distributed welding residual stress, rolling direction and loading direction fur the improvement of safety and endurance in manufacture of their structures.

일반강, SiliconSteel, StainlessSteel겸용 수용성 냉간압연유의 개발 및 적용 (Development & Application of New Multi-Purpose Rolling Oil)

  • 송교봉;권구준;김민구
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2004년도 제5회 압연심포지엄 신 시장 개척을 위한 압연기술
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    • pp.261-267
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    • 2004
  • Current steel makers are trying to develop new manufacturing process to secure price competition and to improve productivity by testing a various kinds of rolling condition of several kinds of steel at TCM. Accordingly, Reverse Mill operation for Stainless steel is changing to TCM operation and furthermore, even general carbon steel and electric steel plate are requested to be worked at TCM simultaneously. By these changing of rolling condition, it become to be necessary to develop new water-soluble cold rolling oil that has a characteristics to be suitable for various working condition and in this report, we would like to mention lubrication condition to fulfill requested characteristics of each steels and development and applying result of multi-purpose water-soluble cold rolling oil which has such an lubrication property.

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비포장 노면 주행을 위한 스케이트보드의 조향제어기구 설계 (Design of a Steering Control Mechanism for a Skateboard on Off-road Driving)

  • 심한섭
    • 한국공작기계학회논문집
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    • 제14권3호
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    • pp.110-115
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    • 2005
  • Driving performance is affected by a steering mechanism and characteristics of the ground at off-road skateboarding. In order to drive on off-road, it is necessary off-road wheel and high performance steering mechanism to adapt on various configuration of the ground. In this paper, design factors are studied to affect to steering radius such as inclination angle of a king-bolt, distance of a wheel axle, and rolling angle of a deck plate. A steering system is adhered to inclination face of the deck plate. And, inclination angle is existed between the king-bolt and the flat face of the deck plate. Therefore, the wheel axle of the steering system can be steered by control of the rolling angle of the deck plate.

철도차량용 휠 플레이트의 응력해석 및 형상설계에 관한 연구(2) (A Study on the Shape Design and Stress Analysis of Wheel Plate for Rolling Stock (2))

  • 성기득;양원호;조명래;정기현
    • 한국자동차공학회논문집
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    • 제9권3호
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    • pp.221-229
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    • 2001
  • The mechanical stress due to the wheel-rail contact and thermal stress due to the drag braking increase the incidence of wheel failure. So, firstly, stress analyses(mechanical, thermal and combined stress) of wheel plate are performed using 3-dimensional finite element method(FEM). Secondly, the optimum design of wheel plate ;s investigated in order to reduce weight of the wheel based on results of stress analysis. The optimum design is peformed using 2-dimensional axisymmetric F.E. model and its results are verified by 3-dimensional F. E. model.

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철도차량용 휠 플레이트의 응력해석 및 형상설계에 관한 연구 (2) (A Study on the Shape Design and Stress Analysis of Wheel Plate for Rolling Stock (2))

  • 성기득;양원호;조명래;정기현;김철
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 추계학술대회논문집A
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    • pp.351-356
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    • 2000
  • The mechanical stress due to the wheel-rail contact and thermal stress due to the drag braking increase the incidence of wheel failure. So, firstly, stress analyses(mechanical, thermal and combined stress) of wheel plate are performed using 3-dimensional finite element method(FEM). Secondly, the optimum design of wheel plate is investigated in order to reduce weight of the wheel based on results of stress analysis. The optimum design is peformed using 2-dimensional axisymmetric F.E. model and its results are verified by 3-dimensional F. E. model.

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안벽 앞에 부분 잠긴 진자판에 의한 파랑에너지 추출 (Wave Energy Extraction using Partially Submerged Pendulum Plate with Quay Wall)

  • 조일형;이혜빈;배윤혁
    • 한국해양공학회지
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    • 제31권3호
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    • pp.208-218
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    • 2017
  • The performance of a wave energy converter (WEC) that uses the rolling motion of a partially submerged pendulum plate in front of a quay wall was analyzed. The wave exciting moment and hydrodynamic moment were obtained using a matched eigenfunction expansion method (MEEM) based on the linear potential theory, and then the roll motion response of a pendulum plate, time averaged extracted power, and efficiency were investigated. The optimal PTO damping coefficient was suggested to give the optimal extracted power. The peak value of the optimal extracted power occurs at the resonant frequency. The resonant peak and its width increase as the submergence depth of the pendulum plate decreases and thickness of the pendulum plate increases. An increase in the wave incidence angle reduces the efficiency of the wave energy converter. In addition, the WEC using a rolling pendulum plate contributes not only to the extraction of the wave energy, but also to a reduction in the waves reflected from the quay wall, which helps to stabilize ships going near the quay wall.