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심도식(D. S. Shim),양동열(D. Y. Yang),정성욱(S. W. Chung),한명수(M. S. Han) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
For the effective manufacture of doubly curved metal plates, a line array roll set (LARS) process is proposed. The suggested process utilizes a pair of upper and lower symmetric roll assemblies. In the process, the initial plate is progressed into the final shape in a stepwise or pathwise manner according to the basic principle of the incremental forming process. In this work, the intermediate shape which is closest to a final shape is proposed to fabricate the desired shape effectively in design of forming schedule. The intermediate shape has homogeneous curvature in a longitudinal and transverse direction so that it can be fabricated easily without complicated controls of rolls in the roll set. The method of approximation using genetic algorithm is proposed and applied to some actual ship hulls to evaluate the efficiency of the algorithm.
심도식(D. S. Shim),양동열(D. Y. Yang),정성욱(S. W. Chung),한명수(M. S. Han) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
The line array roll set process, as one of many kinds of incremental forming processes, is a continuous process in which a flat metal plate is formed into a singly or doubly curved plate through successive passes of forming rolls. It was found that the curvature level of the formed plates in the previous study was well over the curvature required in shipyards. This fact shows that the LARS method has considerable potential for shipbuilding applications. In a shipbuilding yard, hull forming is an important fabrication process in which flat plates are deformed into singly or doubly curved plates. The major purpose of the present study is to estimate experimentally the general applicability of the line array roll set process for the manufacture of ship hull plates. In this study, the target shapes are selected through investigation of the shape classification of ship hull plates that comprise a certain vessel. Forming processes for twisted shapes are analyzed with the finite element method (FEM). Finally, the results of experimental work for two types of target shapes are presented.
선형 배열 롤 셋을 이용한 오목형상 강판 성형경로 설계
노형주(H. J. Roh),김광희(K. H. Kim),심도식(D. S. Shim),양동열(D. Y. Yang),정성욱(S. W. Chung),한명수(M. S. Han) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.7
Incremental forming path to manufacture a thick concave steel plate using the line array roll set is designed. To find the optimum forming path, the forming processes are simulated by the finite element method. A general-purpose commercial software, MSC.MARC is used. A modeling with 8-node hexahedral elastic-plastic solid is performed to predict accurate springback and the analysis process was composed of 18 passes. The proposed forming paths are verified through experiments carried out in the prototype line array roll set. It is found that the process can be successfully applied to the fabrication of the dual curvature ship hull plate.