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신보성(B. S. Shin),오재용(J. Y. Oh) 한국레이저가공학회 2006 한국레이저가공학회지 Vol.9 No.1
The technologies of laser micromachining are changed toward more complex-micropatterning, from the micro circle-shaped hole drilling to the micro arbitrary-shaped hole drilling. In this paper, the fundamental experiments by using DPSS 3rd harmonic Nd:YVO₄ laser(A=355㎚) were carried out in order to obtain the feasibility of flexible micropatterning by various fixed masks. Fixed masks and Galvano scanners were investigatde to make micro patterns. From these experimental results, micropatterns on PEN film were rapidly manufactured in large area.
이음매없는 압력 용기 제작을 위한 다단 드로잉 금형 설계에 관한 연구
신보성(B.S.SHIN),최두선(D.S.CHOI),신영우(Y.W.SHIN) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
In this paper, we will discuss the die design of multi-stage drawing for large size cylindrical shells with multi thickness wall sections such as straight, stepped, tapered sides. These shells are achieved by our continuous deep drawing process. This process required no in-process annealing. But after cold working. These shells is performed heat treatment. These shells are used for the making of seamless LPG pressure vessels after the spinning process. This process is composed of deep drawing, reverse redrawing, drawingironing and several ironing processes.