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Eco-Al 판재 성형성 향상을 위한 패턴 적용 및 성형성 평가
전용준(Y. J. Jeon),신광호(K. H. Shin),박형필(H. P. Park),허영무(Y. M. Heo) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
Vehicle lightweighting is required to improve vehicle fuel economy in accordance with environmental regulations. Aluminium sheet is one of materials which satisfy lightweighting. Because aluminum sheet has low formability, it is difficult to apply metal forming process to the material. So warm and hot formability process is applied to aluminum sheet. One of ways to improve formability of the hard-to-form typed aluminum is to apply embossing shaped pattern to the material. The aluminum sheet to which the pattern is applied has enough formability at a high temperature. The purpose of this study is to improve formability of aluminium sheet at a high temperature. To achieve that, this researcher applied pyramid shaped pattern to aluminum sheet and conducted deep-drawing formability test to check how much formability is improved. The test result revealed that the sheet with pattern application improved formability around 120% higher than the sheet without pattern application.
모바일 기기용 평면 배열 커넥터 Contact 접압력 분석에 관한 연구
전용준(Y. J. Jeon),신광호(K. H. Shin),김종덕(J. D. Kim),한무근(M. K. Han),윤선진(S. J. Yoon),장성호(S. H. Chang),허영무(Y. M. Heo) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
As the need for miniaturizing, weight lightening, high performance of small mobile display product such as Tablet PC are increasing, the need for miniaturizing, weight lightening, high performance and high density for connector which is installed interior of that kinds of device are also increasingly needed now. To meet this kind of demand, we can suggest planar array connector whose terminal pin can be arranged not in one direction but bidirectional to maximize space occupancy. For connector, its contact reliability should be required to deliver electric signal between other components. In order to analyze contact reliability of planar array connector, we developed contact pressure device to compress fine terminal to figure out prediction of contact pressure through analysis and features of contact pressure by test. After forming analysis for contact pressure prediction, we confirmed that spring back at 1.349° generated compared to conventional design through spring back process, after that analysis on contact pressure prediction are proceeded. For predicted contact pressure, it shows 0.65N. For contact pressure test, we implemented contact pressure test after designating typical 5 pins among 40ea of terminal pin. For every section, it showed contact pressure of similar tendency with value of 0.5N~0.6N for contact pressure distribution.
마모특성 및 성형 CAE를 이용한 프레스 금형 손상예측
전용준(Y. J. Jeon),허영무(Y. M. Heo),윤국태(K. T. Yoon),김세호(S. H. Kim) 한국소성가공학회 2013 금형가공 심포지엄 Vol.2013 No.9
The damage level of the die surface is predicted with the finite element analysis and the characteristics obtained from wear tests. A prediction model is derived with the surface roughness result according to the contact pressure and the sliding speed obtained from the wear tests. Surface roughness values obtained from the experiment and the predicted model are compared with each other at the damaged area in the die surface to confirm the validity and applicability of the proposed model, which shows fairly good agreement with each other.