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수치해석을 통한 7인치 도광판 사출압축성형 공정범위 예측
홍석관(S.K. Hong),민인기(I.K. Min),강정진(J.J. Kang),윤경환(K.H. Yoon) 한국소성가공학회 2010 금형가공 심포지엄 Vol.2010 No.11
The main objective of the present study is to predict the process window of injection-compression molding corresponding to the capability of an injection machine for fabricating 7 inch LGP. The open distance and volume filled after injection stage were found to be two important factors that affect critical requirements such as flow length, injection pressure and clamping force for the process. Process window for the key factors was also predicted by response surface method. As a result, predicted process window for open distance and volume filled after injection stage stage satisfying the critical requirement with a given injection machine was in the range of 60 ~ 75%, and 104.00 ~ 104.25%, respectively.
사출 및 사출/압축이 투명 디스크의 복굴절 분포에 미치는 영향에 관한 실험적 연구
민인기(I. K. Min),이경범(K. B. Lee),윤경환(K. H. Yoon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Recently, injection/compression molding process became more popular than ever to produce many transparent optical products of high precision. Especially, optical disk for read/write is the best example. But those optical disks can cause sensorial problems because of high birefringence or deformation from the residual stresses in the media. Therefore, it is necessary to study the effects of various process conditions on the final birefringence structure in injection-only and injection/compression molded disks for producing precision injection-molded products. In thd present paper we have focused on the effect of injection, holding and compression processes on the optical anisotropy(i.e. birefringence) remaining in the MOD by examining the gapwise distribution of birefringence and extinction angle. The effect of holding pressure was found to form the inner two birefringence peaks. But the effect of compression pressure on the birefringence distribution was found to make the uniform distribution near the center in the gapwise direction and inversion of extinction angle far from the gate.
급속가열 및 압축의 효과가 7인치 도광판의 복굴절 분포에 미치는 영향에 관한 실험적 연구
민인기(I. K. MIn),홍석관(S. K. Hong),강정진(J. J. Kang),김민구(M. G. Kim),정의철(E. C. Jung),윤경환(K. H. Yoon) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
As the growth of injection molding technology, injected-molded optical products require higher dimension accuracy and optical stability than ever. In the present study, four kinds of molding mechanisms, i.e., conventional injection molding(CIM), injection/compression molding(ICM), rapid heat and cooling the mold(RHCM) and rapid injection/compression molding(RICM) were chosen to investigate the optical anisotropy of 7 inch LGP by examining the in-plane and gap-wise distribution of birefringence and extinction angle. As a result, the compression process could decrease flow-induced birefringence for the whole region and rapid heating could decrease the birefringence level than conventional molding mechanism. Finally, for the combination of compression and rapid heating, the reversal flow was detected from the distribution of extinction angle near the gate.
2.5인치 도광판의 게이트 자동절삭 및 사출/압축성형법을 이 용한 사이클 타임 저감에 관한 연구
민인기(I.K. Min),김종선(J.S. Kim),고영배(Y.B. Ko),허영무(Y.M. Heo),신광호(K.H. Shin),윤경환(K.H. Yoon) 한국소성가공학회 2011 금형가공 심포지엄 Vol.2011 No.9
Currently conventional injection molding system of extremely thin-wall parts such as LGPs (Light Guide Plates) for mobile display reaches the limit due to frozen layer and the critical speed of injection. The melted polymer in the cavity is rapidly frozen because of high heat flux from injected polymer to mold base. To overcome these problems various attempts have been studied such as RHCM, ICM, ultra high speed injection molding assisted by high pressurized gas, etc.. In the present study, injection/compression molding was applied to form a thin wall parts. Futhermore, to decrease the cycle time for production, a novel mold system was proposed including automated gate cutting mechanism. As a result, productivity of part was increased to 40% higher than usual and cycle time was decreased to 10 sec under.