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이위로(W.R. Lee),김흥규(H.K. Kim),김종덕(J.D. Kim),한병기(B.K. Han) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Magnesium alloy is expected to be widely used for structural components in the aerospace, electronics, and automobile applications due to its excellent EMI shielding and lightweight characteristics. However, the magnesium alloy press forming technology, considered as an economical manufacturing method, requires an investigation of forming at high temperature range because of the low formability of magnesium at room temperature. In the present investigation, a heatable square cup drawing die was developed, and the warm press forming was conducted using AZ31B sheet. The formability of magnesium alloy at various temperatures was evaluated by considering the drawing ratios and the cracks observed in the drawn AZ31B square cups.
Graphite/Epoxy 적층복합재의 층간파괴 향상을 위한 프리프레그의 전처리 연구
이경엽(Rhee K. Y.),김민호(Kim M. H.),백영남(Paik Y. N.),이위로(Lee W. R.) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this study, the graphite/epoxy prepregs were surface-treated using O² plasma, and optimal treatment time was determined measuring the contact angle. Interlaminar toughness of surface-treated graphite/epoxy composites was compared with that of regular (untreated) graphite/epoxy composites. The results showed that the contact angle was a minimum when treated for 30 minutes. The interlaminar toughness of surface-treated case was improved about 20% compared with that of regular case.
이흥국(H.G. Lee),유송민(S.M. Yoo),이위로(W.R. Lee),이동규(D.K. Lee),노대호(D.H. Ro),박환서(H.S. Park) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
The purpose of this study is to introduce the standard of the Performance and evaluation method for Multi Ball Bearing Slide Rail. The major evaluation criteria include deformation (for durability test). Due to the difficulties in assessing the deformation of each slides directly, performance of the whole rail was analized. From finite element analsys and beam theroy, deformation of the multi ball bearing slide rail was evaluated. The evaluation method is shown for the performance of the static deformation and pulling force of the Multi Ball Bearing Slide Rail.
박환서,유송민,이동규,이위로,노대호 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
A machining processes for flange panel has been introduced. Contrary to the conventional methods like Y forming and welding, roll-seaming method has been utilized for better quality and less cost. Several measurement methods including digital image processing have been used to confirm the product quality assurance.