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직접 가열방식에 의한 극세선의 직선화 및 전단 버의 최소화에 관한 연구
김병희(Byeong Hee Kim),김웅겸(Woong Kyum Kim),홍남표(Nam Pyo Hong),김헌영(Heon Young Kim),윤성만(Seong Man Yoon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
There are many ways about straightening process of the micro wire, such as simple tension, roll forming and pulling as soon as direct/indirect heating. In this study, we have developed a novel wire straightener which uses the direct heating method (DHM) for straightening the micro wire. In order to avoid the surface oxidization, we supplied the inert gas(Ar) during the heating process and examined the effect of gas flow rate. And we evaluated the burr height at the end of the wire which used the shearing machines. From various experiments and analyses, we could obtain fine straightness(? 1㎛/1000㎛), roundness(<±2㎛ /100㎛) and minimized the burr height when the tension is 500~600gf and the current is about 1.5A.
김병희(Byeong-hee Kim),김헌영(Heon-young Kim),김호(Ho Kim),김광순(Kwang-soon Kim),강신일(Shin-ill Kang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The hot embossing process has been mentioned as one of major nanoreplication techniques. This is due to<br/> its simple process, low cost, high replication fidelity and relatively high throughput. As the initial step of<br/> quantitating the embossing process , simple parametric study about embossing time have been carried out<br/> using high-resolution masters which patterned by the DRIE process and laser machining. Under the various<br/> embossing time, the viscous flow of thin PMMA films into microcavities during compression force has been<br/> investigated. Also, a study about simulating the viscous flow during embossing process has planned and<br/> continuum scale FDM analysis was applied on this simulation. With currently available test data and<br/> condition, simple FDM analysis using FLOW3D was made attempt to match simulation and experiment.