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우영윤(Y. Y. Woo),이민(M. Li),강형석(H. S. Kang),황태우,문영훈,T. W. Woo 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
The flexible roll forming process makes it possible to produce profiles with a variable width by controlling the roll stands with CNC. But profile with variable cross-sections by flexible roll forming has a shape defects, so called buckling. Buckling occurs due to the geometrical deviations which cause longitudinal residual stress in the transitional zones of the profile between the initial metal strip and the roll-formed profile. Therefore in this study, the effect of forming parameters of metal blank on the longitudinal and shape error which are affected by several parameters have been performed to prevent buckling. The parameter investigated in this study is the forming angle. For the flexible roll forming experiments, symmetrical U-sections are formed from advanced high strength steel (AHSS) blank. Numerical simulations by finite element analysis have also been performed to analyze strain variations during roll forming. The tracing of incremental strains at the edge may provide insights to solve buckling problems. From the analysis results, the behavior of buckling in flexible roll forming process can be predicted with relation between geometry parameters and longitudinal and shape error.
우영윤(Y. Y. Woo),김재현(J.H. Kim),박성환(S. H. Park),박준영(J. Y. Park),문영훈(Y. H. Moon) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
The flexible roll forming process makes it possible to produce profiles with a variable width by controlling the roll stands with CNC. This process is very important for the sheet metal industry due to the high speed fabrication of products having variable profile. In this study, the effect of on the forming length of the strip in the flexible roll forming process was investigated of material properties. In the flexible roll forming, the deformation length is important since they can be used to determine the number of forming steps and the distance between them when designing the roll forming process. In this study, the influence of material properties upon deformation length have been investigated and compared with by existing model by using finite element analysis and experiment. For the flexible roll forming experiments, symmetrical U-sections are formed by three materials such as advanced high strength steel (AHSS), carbon steel and aluminum.