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김건희,진호,양순철,김명상,국명호,이성호,육인수,Kim, Geon-Hee,Jin, Ho,Yang, Sun-Chol,Kim, Myung-Sang,Kook, Myung-Ho,Lee, Sung-Ho,Yuk, In-Soo 한국천문학회 2007 天文學論叢 Vol.22 No.3
The KASINICS (Korea Astronomy and Space science Institute Near Infrared Camera System) is a ground-based near-infrared (NIR) imaging instrument. KASINICS has offner relay optics to reduce unwanted infrared light. For the offner optics, we adopted an ultra precision machining process which is installed at KBSI (Korea Basics Science research Institute). Since the offner relay optics is made of aluminum 6061 metal material, we did several tests to reach the specification. We found that a 0.497mm radius nose bite and 220m/min machining speed are best tool and condition to make this offner optics with the precision machine. In this paper, we report the technical method of ultra precision machining and results of the KASINICS offner optics.
양순철(Sun Choel Yang),허명상(Myung Sang Huh),김상혁(Sang Hyuk Kim),이길재(Gil Jae Lee),이상용(Sang Yong Lee),국명호(Myung Ho Kook),장기수(Ki Soo Chang),유선영(Seon Young Ryu),원종호(Jong Ho Won),김건희(Geon Hee Kim) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.3
In nowadays, the infrared optics is frequently employed to various fields such as military, aerospace, industry and medical. To develop the infrared optics, special glasses which can transmit infrared wave are required. Ge(Germanium), Si(silicon), and fluoride glasses are typically used for material of the infrared optics. Compared with Ge and Si glasses, fluoride glasses have high transmittance in infrared wavelength range. Additionally, UV(ultraviolet) and visible light can be transmitted through fluoride glasses. There characteristics of fluoride glasses makes it possible to evaluate optical performance with generally used visible testing equipment. In this paper, we used design of experiment to find ultra precision machining characteristic of Ge and fluoride glasses and optimized machining process to obtain required form accuracy of PV(Peak to Valley) 0.2 ㎛.
김건희(Geon Hee Kim),양순철(Sun Choel Yang),국명호(Myung Ho Kook),원종호(Jong Ho Won) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Because of some characteristics of the infrared(IR), IR optical systems have many advantages for development of many commercial field. The thermal imaging camera which works in 8 - 12 wavelength range with 25 degree FOV (Field of View) consists of three aspheric germanium lenses and fabricated by KBSI using a Freeform 700 5-axis ultra precision machine. Surface roughness and form accuracy of the fabricated germanium aspheric lens were measured by using NT 2000 and UA3P and the measurement results are Ra 1.35㎚ and P-V 0.38㎛.
김건희(Geon-Hee Kim),김윤중(Youn-Joong Kim),국명호(Myung-Ho Kook),이선규(Sun-Kyu Lee),홍권희(Kweon-Hee Hong) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.2
This paper describes development of low cost precision machine that has a vacuum chuck. This study mainly aims to find out a cutting condition for maintaining optimum surface condition and to examine cutting characteristics of the precision machine that is equipped by diamond bites. The cutting materials is oxygen free copper. Several experiments were carried out to find out the main factors that affect the surface roughness such as principal axis RPM(rotation per minute), feeding speed, and cutting depth. As a result, we obtain The optimum cutting condition of the developed precision machine.
김건희(Geon-Hee Kim),김효식(Hyo-Sik Kim),양순철(Soon-Cheol Yang),이상용(Sang-Yong Lee),국명호(Myung-Ho Kook),이선규(Sun-Gyu Lee),김윤중(Youn-Joong Kim),홍권희(Kweon-Hee Hong) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.10
This paper describes development of low cost precision machine that has combined the Build-in Motor with a vacuum chuck. This study mainly aims to find out a cutting condition for maintaining optimum surface condition and to examine cutting characteristics of the precision machine that is equipped by diamond bites. The cutting materials is Al alloy. Several experiments were carried out to find out the main factors that affect the surface roughness such as principal axis RPM(rotation per minute), feeding speed, and cutting depth. As a result, we obtain The optimum cutting condition of the developed precision machine.
김건희,김효식,양순철,이상용,국명호,이선규,김윤중,홍권희 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
This paper describes development of low cost precision machine that has combined the Build-in Motor with a vacuum chuck. This study mainly aims to find out a cutting condition for maintaining optimum surface condition and to examine cutting characteristics of the precision machine that is equipped by diamond bites. The cutting materials is Al alloy. Several experiments were carried out to find out the main factors that affect the surface roughness such as principal axis RPM(rotation per minute), feeding speed, and cutting depth. As a result, we obtain The optimum cutting condition of the developed precision machine.