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고성현(S. H. Ko),서재형(J. H. Seo),이필종(P. J. Lee),천명식(M. S. Chun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In order to remove the shape defect of plate, the levelling process is import in the online plate rolling process. In the levelling process, the process condition is related with the performance of leveller to improve the flatness of plate. In this paper, we carried out the simulation the levelling process with various roll gap to fine out the best condition. However, there is the limitation of levelling process to remove the shape imperfections of plate. Due to the arrangement of work roll of leveller, the plastic deformation cannot be occurred from the end of plate to the distance with the half length of work roll pitch. In the FEM analysis, It is to almost impossible to describe the initial condition of plate before levelling. So, the accuracy of the FEM analysis for the levelling could be poor.
이필종,이승홍,최호 釜山大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.57 No.-
열간 압연과정에서 회전률에 충돌하는 스프레이 제트분사에 의한 열전단계수를, 3가지 크기의 평면 형태의 노즐을 사용하여 실험실의 다양한 실험 조건하에서 측정하였다. 열전달 계수는 유한 차분법에 의해 계산되었고, 그 결과들은 다른 실험결과들과 잘 일치하였다. 실험조건에서 냉각환경과 장치의 배열이 롤의 온도에 미치는 영향을 연구하였다. 분사된 영역에서 평균 열전달계수는 12에서 24 kW/m²K 범위이고, 분사압력의 0.4승에 비례한다. 열간압연 과정의 시뮬레이션 결과는 롤바이트 구에서 냉각 능력이 더욱 효과적임을 보여준다. The heat transfer coefficients on a rotating roll have been evaluated under various experimental, hot rolling conditions in the laboratory with 3 different sizes of flat type nozzles for impinging spray jets. The heat transfer coefficients were calculated by FDM and were in good accordance with other experinments. The effects of cooling conditions and configurations of spray device on the roll temperature have been investigated. The average heat transfer coefficients on the sprayed area are between 12 and 24 kW/㎡K, and proportional to the 0.4 power of the spraying pressure. The results of simulation for hot rolling process show that the enhancement of cooling capacity near the roll bite exit is most efficient.
이재곤,권오준,이경종,강기봉,이필종,박윤순,노근기,민경준,이주동,유규천 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.11
An on-line computer system was developed for prediction of tensile properties of C-Mn steels manufactured in the hot strip mill. To predict the final microstructure and properties in plain carbon steel hot coils, a mathematical model based on physical metallurgy was developed. Computer modelling was carried out to describe the microstrucal evolution during hot rolling and cooling and the interrelationships existing between microstructure and mechanical properties. The mathematical model consists of three sub-models : austenite conditioning model, transformation model and mechanical property model. The austenite conditioning model deals with recovery, recrystallization and grain growth which occur during hot rolling. The allotropic phase transformtaiton from austenite to ferrite, pearilte and bainite are described by the transformation model. The final mechanical properties are determined from the structure-property relationships established in the mechanical property model. An Avrami-type kinetic equation was used for mathematical representation of recrystallization and austenite/ferrite transformation. The structure-property relationship was formulated by combining the Hall-Petch equation with the mixture rule. In order to apply the model to the practical hot rolling process, an on-line computer system was installed at a hot strip mill. The on-line system consists of a high speed process computer and software packages. The predicted values of tensile strength from the system were in reasonable agreement with the measured ones when hot strips were processed under various rolling conditions.