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RISS 인기검색어
- 검색키워드
- 저자 : 최대곤(D. G. Choi) (검색결과 1 건)
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박원웅(W. W. Park),김동규(D. K. Kim),임용택(Y. T. Im),권혁철(H. C. Kwon),최대곤(D. G. Choi),천명식(M. S. Chun) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
During strip coiling process, axial inhomogeneity of the stress distribution within a thin strip causes defects such as edge wave and center buckle which are the key concern of customer requirements. In the current study, an analytical model for determining the stress distribution and deformation was utilized to investigate the mechanism of flatness change of the strip and to prevent such defects. In the present model, the coil and the newly coiled strip was assumed to be a thick and thin hollow cylinder, respectively. The coiling process was modeled by consecutively coupling the thin cylinder, which is subject to the circumferential stress due to the coiling tension, onto the thick cylinder. Then, the thick cylinder is subject to the outer radial pressure resulting from the circumferential stress in the thin cylinder. In each coiling, the incremental stress field within the thick cylinder was solved by using Love’s stress function. The stress field within the coil during the coiling process was obtained via the principle of superposition of the additional stress field. In order to consider the axial inhomogeneity of the deformation, a thickness distribution of the strip due to the strip crown was taken into account in the analysis. According to the present analysis, it was found that the flatness improvement can be acquired by decreasing the strip crown and the coiling tension in terms of the circumferential stress distribution.
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