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윤선진(S. J. Yoon),김현철(H. C. Kim),신희석(H. S. Shin) 한국소성가공학회 2012 금형가공 심포지엄 Vol.2012 No.9
As the industry demands narrow pitch connectors for the electronic devices, the moldability of small-scale connectors is a great concern for injection molding process because of their small features. The particular defects related are weld lines, black spots, and short shots. Along with these product-level defects, the durability of the machine is also a challenge for quality control purpose. In this study, we introduced some new designs to the injection mold assembly of connectors. Our new mold assembly included gas vent system, limit switch, and modified mold blocks. As a result, we successfully remove weld lines and other defects. We were also able to find out that the new system needs less maintenance cost.
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.