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링 롤링 공정에서 링 치수에 따른 블랭크 치수 최적화에 관한 연구
남윤건(Yoon-Gun Nam),김상윤(Sang-Yun Kim),전찬후(Chan-Hu Jeon),성경진(Kyung-Jin Sung),문영훈(Young-Hoon Moon) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
The ring rolling design includes geometry design and optimization of process variables. In ring rolling, the finished ring dimensions include both the cross-sectional shape and the diameter. Therefore, the blank volume assumes would alter the final product dimensions, because the volume remains unchanged during the rolling operation. So, it is significant to design initial blank sizes. In this study, optimized dimension of blank according to target ring dimension was predicted by using FEM analysis and physical modeling experiment with lead-based was used. A commercial FEM code, Forge2008 was used to simulate the effect of various blank sizes.
李聖甲,成慶男 한경대학교 2004 論文集 Vol.26 No.1
Mixture of expressed & solvent extracted crude corn oil obtained from corn germ was carried out partial andlor total cooling process through heat exchange. Crude oil mixture at 40℃, 60℃ and 80℃ was storaged in storage tank under direct sunlight irradiation. Final deodorized(RBD) oil obtained through refining process used for storaged crude oil, it was determine color change of this RBD oil. RBD oils obtained were storaged in market and dark place as 0.9 ℓPET packaging bottle. Cause investigation of color reversion was attempted from Lovibond color change during storage period. At the result, color reversion wasn't appeared the linear correlation with refining process like to residual phosphorus con-tent, free fatty acids content and removal degree of pigments. As a result, cause of color reversion in corn oil was color fixation according to storage of crude oil at high temperature. Color fixed crude oil was not able to control at refining process. Prevention method of color reversion in corn oil was low temperature storage of crude oil at less than 40℃.