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금속 마이크로 와이어의 단조-굽힘 성형에서 스프링백에 관한 해석적 연구
강정진(J. J. Kang),홍석관(S. K. Hong),전병희(B. H. Jeon),표창률(C. R. Pyo) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
Springback is one of factors affecting precision in metal forming. Its effect is particularly prominent in bending process. In this study, bending and forging process are used in order to manufacture a micro spring with two bending region from 60μm diameter wire. Springback in the process lowers the precision of the micro spring. Overbending for springback compensation has wide usage in a general way. However, this method requires repeated modifications of press dies until the tolerance is allowable, which causes that production cost and time increase. In this paper, we analyzed the mechanism of springback in the forming process of the micro spring using finite element method. In addition, a simple method to control springback without modifying dies was proposed by performing numerical analysis with various parameters.
강정진(J. J. Kang),김정언(J. E. Kim),홍석관(S. K. Hong),김종덕(J. D. Kim),허영무(Y. M. Heo),조종두(C. Cho) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
Ultra-thin sheet metal forming techniques are required in precision forming of miniaturized and integrated products. In order to manufacture a good quality and low cost ultra-thin sheet metal products, a highly precise high-speed press is needed. The precision of a press is related with its vibration characteristics during pressing operation. This study evaluated the vibration characteristics of a proposed press design using computer simulation. The analysis compares the static deformation characteristics of the slide and the slide motion for the metal forming of an ultra-thin sheet of thickness less than 0.1mm. Further, in order to minimize the vibrations during high speed pressing operation, revolution balances of the eccentric shaft and the balance weight device is also considered. Finally, modal analysis is used to characterize the natural frequency of vibration of the press.
오정길(J. G. Oh),김종선(J. S. Kim),강정진(J. J. Kang),김종덕(J. D. Kim),윤경환(K. H. Yoon),황철진(C. J. Hwang) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Recently, many researches on the development of super-hydrophobic and anti-reflective surfaces have been concentrated on the fabrication of nano-patterned products. The nano-patterned mold is a key to replicate nano-patterned products by mass production techniques such as injection molding and and UV molding. The present paper proposes fabricating nano-patterned mold with cost-effective method. The nano-pattern molded was fabricated by electroforming the anodic aluminum oxide template without E-beam lithography. The final mold with nano-patterns showed the pores with the diameter of 100~200 nm and the height of 150 nm was fabricated.