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7인치급 중소형 도광판의 미세패턴 전사성 향상을 위한 RHCM과 사출/압축 성형의 비교연구
조성우(S. W. Cho),이용주(Y. J. Lee),민인기(I. K. Min),김종선(J. S. Kim),황철진(C. J. Hwang),윤경환(K. H. Yoon),강정진(J. J. Kang) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Recently, according to the rapid development of display, many display applications, such as, cellular phone, navigation, monitor and LCD TV have been changed from CRT type to LCD type. BLU(Back Light Unit) is one of main parts in LCD unit and, generally, it consists of a light source, a reflective sheet, a LGP(Light Guide Plate), a diffuser sheet, and two prism sheets. The most important component of BLU is a light guide plate, which diffuses the input light to the TFT-LCD module uniformly. The LGP is usually made by injection molding process, and it has numerous optical micro patterns on the surface. In the present study the micro-patterned stamper which has cylindrical shape was fabricated by using the UV-LiGA process. And the replication characteristics have been compared among three different kinds of injection molding process; general injection molding, injection/compression molding and RHCM(Rapid Heating and Cooling Molding). Average replication ratios of CIM and ICM were 19.1% and 64.6%, respectively. On the other hand, average replication ratio of RHCM process showed the higher value of 98.4% among those. Finally, maintaining the mold surface above Tg could increase the replication ratio of micro patterns substantially.
조성우(S.W.Cho),최상민(S.M.Choi),배충식(C.S.Bae),노석홍(S.H.Noh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Measurement tecliniques were developed to quantify the instantaneous piston assembly friction force and the oil film thickness between the piston rings and the cylinder liner. That can be easily applied to small multi-cylinder production engine. The friction force and oil film thickness data were acquired under various operation conditions and for various oils in an SI four cylinder engine. In this study, friction force data were found to be more reliable in consequence of proper compensation. It was possible to measure oil film thickness on thin oil ring rails as well as compression rings. The results revealed that mixed lubrication is dominant in limited operating conditions where product of kinematic viscosity and mean piston speed is lower than 80xl0^-6m³/s2.<br/>