• 제목/요약/키워드: Edger

검색결과 22건 처리시간 0.029초

형상 엣저 롤을 이용한 열간 조압연 공정의 슬래브 폭 퍼짐 예측 모델 (A Model for Slab Width Spread during Hot Rough Rolling Using a Profiled Edger Roll)

  • 이경훈;한진규;유광현;김형진;김병민
    • 소성∙가공
    • /
    • 제25권2호
    • /
    • pp.102-108
    • /
    • 2016
  • The aim of the current study was to develop an advanced prediction model for the slab width spread during hot rough rolling. Rough rolling consists of both vertical rolling using a set of profiled edger rolls and horizontal rolling using a set of plain work rolls. FE-simulations were performed to investigate the influences of process variables such as initial slab width, initial thickness, sizing draft, edger roll draft and work roll draft on the final slab width variation. From a statistical analysis of the simulation results, an advanced model, which can predict the slab width spread during the edger rolling and horizontal rolling, was developed. The experimental hot rolling trials showed that the newly developed model provided fairly accurate predictions on the slab width spread during hot rough rolling process using a profiled edger rolls.

열간조압연 공정에서의 폭 압하 공정시 슬래브의 변형 특성 (Plastic characteristic analysis of width reduction process in hot roughing mill)

  • 허수진;이상호;변상민;박해두;이종빈;김병민
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2007년도 춘계학술대회A
    • /
    • pp.544-548
    • /
    • 2007
  • In general, final width of hot strip should be accomplished in this stage because width reduction of strip hardly appears during typical finishing mill. However, it is difficult to control the width of strip in the roughing mill process as the horizontal rolling of strip is subsequently performed after the vertical rolling. It is therefore important to obtain the deformation rolling direction on strip width to minimize the width spread of strip during horizontal rolling after vertical rolling. Generally there is Sizing press type and Edger-roll type. The width reduction process in sizing press has small amount of width spread compared with the edger. However, productivity by the sizing press process is much lower than those of the edger. In this study, sizing press and Edger-roll process parameters in a sheet rolling mill were set at specified values and the effect of the change in these parameters on product quality and process performance were evaluated.

  • PDF

열연강판 선후단부 폭 정밀도 개선을 위한 최적 엣저롤 개도 제어 (Dynamic Edger Control for the Precise Width Control at the Head, and Tail Ends of Hot Strip)

  • 천명식;이준정;문영훈
    • 대한기계학회논문집A
    • /
    • 제23권7호
    • /
    • pp.1196-1204
    • /
    • 1999
  • adaption of the model predictions is highly desirable. In general, the width deviation at the head and tail ends of strip may be different from that of the steady state region. Therefore, the dynamic edger corrections can be used to compensate the width deviations which would otherwise occur. For the precise width control, the effect of edger roll gap and rolling conditions on the width deviation of head and tail ends of strip has been investigated and the effective method to decrease width deviation has been proposed. On-line application of dynamic edger control method in this study shows about 50% width compensation at the head end of the strip, and near perfect compensation at the tail end of strip.

열간압연 폭압하시 슬래브 변형거동의 유한요소해석 (Finite Element Analysis of Slab Deformation under the Width Reduction in Hot Strip Mill)

  • 천명식;정제숙;안익태;문영훈
    • 소성∙가공
    • /
    • 제12권7호
    • /
    • pp.668-674
    • /
    • 2003
  • Rigid-plastic finite element analyses on the deformation of slabs at various width reductions have been performed. By using commercial finite element code, dog-bone profile, crop profile and the longitudinal width profile after edging and Horizontal rolling have been analysed. The deformation behavior of slab for the heavy edger mill has also been compared with that for the sizing press. From the deformation analyses, it was found that the sizing press-horizontal rolling method is more efficient in width reduction than that of heavy edger mill-horizontal rolling. The results of finite element analyses fer the deformation of slab were well confirmed by the actual operational data. It was found that the amount of width variation after sizing and rolling is about 5∼10mm.

난지도 쓰레기 매립지의 침하 특성 (Settlement Characteristics of Nanji -Island Refuse Landfill)

  • 박현일;라일웅
    • 한국지반공학회지:지반
    • /
    • 제13권2호
    • /
    • pp.65-76
    • /
    • 1997
  • 난지도 쓰레기 매립지 뿐만 아니라 대도시 주변 매립지의 사후활용 방안에 대한 관심이 점차로 고조되고 있다. 본 논문에서는 난지도 쓰레기 매립지에서 2년여간 계측된 침하자료를 분석하여 침하양상을 규명하고자 하였다. 침하분석결과 난지도 쓰레기 매립지의 침하양상은 미국내 24개 매립지에 대해 분석된 침하경향과 유사함을 알 수 있었다. 계측된 침하자료에 대한 해석을 근거로 할 경우, Bjarngard와 Edgers의 침하모델이 난지도 매립지의 장기침하량 예측에 적합한 것으로 사료된다. 10년 후 장기침하량을 예측할 때 Bjarngard와 Edgers의 침하모델은 Power Creep Model과 상당한 예측의 차이를 보였다. 난지도 쓰레기 매립지 침하양상에 대한 분석이 이루어지지 않은 상황에서 단지 기존의 침하모델만을 사용하는 것은 장기침하량 예측시 상당한 오류를 범할 수 있음을 알 수 있었다.

  • PDF

신경망을 이용한 Edger압연 크롭저감 연구 (Crop Control by Using Neural Network in Edger Mill)

  • 천명식;장대섭;이준정
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 1999년도 제3회 압연심포지엄 논문집 압연기술의 미래개척 (Exploitation of Future Rolling Technologies)
    • /
    • pp.438-446
    • /
    • 1999
  • Crop minimization of the top and bottom ends of hot rolled plate, in a plate, in a plate mill, has been investigated. The existing model to determine the edging pattern at the finishing rolling pass was not reasonable to get high width accuracy and rolling yields. New models including width prediction have been formulated by using neural network model of back propagation learning algorithm and statistical analysis based on the actual production rolling data to give the optimal pattern for minimizing trimming loss. Using these models, at a given rolling condition of broadside pass and finishing pass and the permissible condition of width variation, it was possible to minimize crip at the top and bottom ends according to optimum procedure in plate mill. An application to improve the plan view pattern reduced width variation by 23% and crop length by 30% on average with an effective fishtail crop shape.

  • PDF

Edger 압연모델 최적화를 통한 후판압연 실수율 개선 (Optimization of edger model to increase rolling yields in the plate mill)

  • 천명식;이준정;문영훈
    • 소성∙가공
    • /
    • 제8권2호
    • /
    • pp.208-215
    • /
    • 1999
  • To increase rolling yields by minimizing trimming losses of hot-rolled plate, optimization logic for the edger model has been developed. The logic to determine optimum edging amount model has been formulated on the basis of actual production rolling data. In case of broadside rolling, the fish tail shape at the sides of plate was better for reducing the crop loss and this could be achieved when the edging amount of broadside rolling was increased. At a given broadside rolling ratio, methodology to determine optimum edging amount for the finish rolling which could minimize the width deviation of plate were systematically derived. Therefore, for a given broadside rolling condition and the permissible tolerance in width deviation of plate, it was possible to optimize the edging amount in finish rolling to maximize rolling yields. The application of optimization logic in this study increased rolling yields from approximately 10% to 30% at various longitudinal eding raitos.

  • PDF

도그본 고려한 조압연 압연하중 예측모델 개발 (Model for the prediction of Roll Force of Roughing Mill considering Width reduction)

  • 곽우진;이성진
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2007년도 춘계학술대회 논문집
    • /
    • pp.223-225
    • /
    • 2007
  • Online models predicting roll force and forward slip of roughing mill was developed using nondimensional parameters. Using the effective inlet thickness, roll force model take into account the effect of inlet dog-bone shape of slab which take places after width reduction through edger rolling in roughing mill. The prediction accuracy of the proposed model is examined through comparison with measurements.

  • PDF

윤곽선 검출에 바탕을 둔 움직임 추적 ASIC 구현에 관한 연구 (A Study on the Implementation of the Motion Tracing ASIC Based on the Edge Detection)

  • 김희걸;조경순
    • 대한전자공학회:학술대회논문집
    • /
    • 대한전자공학회 2000년도 추계종합학술대회 논문집(2)
    • /
    • pp.112-115
    • /
    • 2000
  • This paper describes the algorithm, architecture and design of the circuit implementing motion tracing features based on the edge detection. The Sobel operation was used to compute the edges of moving objects. Motion tracing is performed by searching for the center of the edges for each frame and adding those centers. The edger and the centers of the moving object from camera were displayed in the monitor and verified using Xillinx FPGA.

  • PDF

후판 에지압연시 선후단부의 변형거동 (An Investigation of Deformation Behavior of Plate Ends in Edge Rolling)

  • 천명식;황상무;이준정;김종근
    • 대한기계학회논문집
    • /
    • 제16권7호
    • /
    • pp.1278-1284
    • /
    • 1992
  • 본 연구에서는 무전단 후판압연기술을 위한 요소기술로써 지난호에 게재한 오버랩연구에 이어 모델압연 실험과 유한요소 해석을 이용한 에징시 비정상부의 폭변 형거동에 대한 연구결과를 보고한다.