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고속 볼엔드밀링에서 가공조건에 따른 초내열합금 (Inconel 718)의 가공특성 평가
권해웅,김정석,강익수,김기태,Kwon, Hae-Woong,Kim, Jeong-Suk,Kang, Ik-Soo,Kim, Ki-Tae 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.3
Inconel 718 alloy has been applied to high temperature, high load and corrosion resistant environments due to its superior properties. However, This alloy is a difficult-to-cut nickel-based superalloy and the chipping or notch wear is mainly generated on the cutting edge of the tool. In this study, the machinability of Inconel 718 is investigated to improve tool life under various cutting conditions with TiCN-based coated ball-end mills. The cutting conditions can be suggested to improve both the tool life and machined surface quality in Inconel 718 high speed machining.
하지층 Cr의 스퍼터링 압력을 달리하여 제작한 Cr/CoSm/Cr 자성막의 자기상호작용이 자기역전부피에 끼치는 영향
권해웅(Hae-Woong Kwon),정순영(Soon Young Jeong),김현수(Hyeon Soo Kim) 한국자기학회 2018 韓國磁氣學會誌 Vol.28 No.6
Magnetic interaction effects on the magnetic switching volume for Cr/CoSm/Cr magnetic films deposited with different sputtering pressures (7~10 mTorr) of underlayer (Cr) was investigated. The magnetic interaction mechanism of all the Cr/CoSm/Cr magnetic films investigated in this study was dipole interaction, and the dipole interaction was stronger at the samples fabricated at low sputtering pressure. The magnetic field (H<SUB>ΔM</SUB>) at which the maximum dipole interaction occurred in each sample was larger than the coercivity (H<SUB>c</SUB>). The magnetic switching volume was larger for the sample with stronger dipole interaction, and it showed maximum value in the H<SUB>ΔM</SUB> region and then decreased in higher field region above the H<SUB>ΔM</SUB>. Therefore, it is considered that the intensity of the dipole interaction is closely related to the magnetic switching volume.
볼엔드밀링에서 가공조건에 따른 초내열합금 (인코넬 718)의 가공성 평가
권해웅(Hae-Woong Kwon),김정석(Jeong-Suk Kim),강익수(Ik-Soo Kang),김기태(Ki-Tae Kim) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
Inconel 718 alloy has been applied to high temperature, high load and corrosion resistant environments due to its superior properties. However, this alloy is a difficult-to-cut nickel-based superalloy. In this study, the machinability of Inconel 718 is investigated to improve tool life under various cutting conditions with UT coated tungsten carbide(WC) ball-end mills. The cutting conditions can be suggested to improve both the tool life and machined surface quality in Inconel 718 machinig.
공구수명과 표면거칠기 특성 분석을 통한 인코넬 718의 가공성 평가
권해웅(Hae-Woong Kwon),강익수(IK-Soo Kang),김정석(Jeong-Suk Kim),문성준(Sung-Jun Moon),김기태(Ki-Tae Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Inconel alloys have been widely used in the aerospace, heavy industry and automotive. Inconel 718 alloy has been applied in high temperature, high load and corrosion resistant environments due to its superior properties. However, This alloy is a difficult-to-cut nickel-based superalloy. In this study, the machinability of Inconel 718 is investigated to improve tool life under various cutting conditions with UT coated tungsten carbide(WC) end mills. . The tool life on the basis of flank wear(0.2㎜) has been investigated in side cutting. The cutting conditions can be suggested to improve both the tool life and machined surface quality in Inconel 718 maching.
고속 스핀들용 HSK 공구 클램핑 장치의 개발 및 성능평가
권해웅(Hae-Woong Kwon),박진효(Jin-Hyo Park),강익수(IK-Soo Kang),김정석(Jeong-Suk Kim),정수영(Su-Yong Kim),박성원(Sung-Won Park) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
As the rotational speed of spindles increases over ten thousands rpm, the HSK tooling system has been widely applied to the high-speed spindle of machining center. This paper presents the development and evaluation of HSK tool clamping system for a high-speed spindle. The HSK tool clamping system is comprised of a clamping unit, a power drawbar and a hydraulic pressure cylinder. These components are developed, and the performance evaluation is carried out. The clamping force transmitted by the drawbar is amplified by 2.7 times, and the number of clamping and unclamping is about 1.2 million.
고속 볼엔드밀링에서 가공조건에 따른 초내열합금(Inconel 718)의 가공특성 평가
권해웅(Hae-Woong Kwon),김정석(Jeong-Suk Kim),강익수(IK-Soo Kang),김기태(Ki-Tae Kim) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.1
Inconel 718 alloy has been applied to high temperature, high load and corrosion resistant environments due to its superior properties. However, This alloy is a difficult-to-cut nickel-based superalloy and the chipping or notch wear is mainly generated on the cutting edge of the tool. In this study, the machinability of Inconel 718 is investigated to improve tool life under various cutting conditions with TiCN-based coated ball-end mills. The cutting conditions can be suggested to improve both the tool life and machined surface quality in Inconel 718 high speed machining.
볼엔드밀링에서 가공조건에 따른 초내열합금 (인코넬 718)의 가공성 평가
권해웅(Hae-Woong Kwon),김정석(Jeong-Suk Kim),강익수(Ik-Soo Kang),김기태(Ki-Tae Kim) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Inconel 718 alloy has been applied to high temperature, high load and corrosion resistant environments due to its superior properties. However, this alloy is a difficult-to-cut nickel-based superalloy. In this study, the machinability of Inconel 718 is investigated to improve tool life under various cutting conditions with UT coated tungsten carbide(WC) ball-end mills. The cutting conditions can be suggested to improve both the tool life and machined surface quality in Inconel 718 machinig.
이근우(Kun Woo Rhee),권해웅(Hae-Woong Kwon) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.4
Records regarding to magnetism in the written Korean history were surveyed. In this article, we depicted how the magnetism (magnet) was understood by the public in the past in the Korea. The records about magnetism could be chronically categorized into three eras; 1) an era of recognizing a magnetic characteristics , 2) era of recognizing a magnetic pole, and 3) era of acquiring a modern knowledge. The written history of the Silla dynasty (BC57-AD935) revealed that a magnet was produced in this era. However, no record about magnet was found in the written history of the Goryo dynasty (918-1392). It was revealed that throughout the Korean history the interest in the magnetism (magnet) was emphasized most in the Josun dynasty (1392-1910). The magnetism (magnet) was most widely exploited in a geomancy. A magnetic compass was used widely to find a merciful direction and place in everyday life. In the era of Josun dynasty, a magnet was exploited as a magnetic compass for a navigation over the sea. An interesting usage of the magnet in the Josun dynasty was found in the pharmaceutical purpose.
이근우(Kun Woo Rhee),권해웅(Hae-Woong Kwon) 한국자기학회 2013 韓國磁氣學會誌 Vol.23 No.4
Until the discovery of universal gravitation, a magnet had been considered to be a unique and magical stuff which exhibited an interacting force between two objects separated afar. Perhaps because of this belief, magnets were used widely as a medicinal stuff in East-Asia. In the present article, the records regarding the applications of a magnet for oriental medicine in written Korean history were surveyed. The records were categorized in terms of efficacy, prescription, and clinical case of taking-medicine. The records revealed that a magnet was used as an important component in the medicine for curing kidney filtering failure. Magnet was also prescribed to heal heart problems. Typical magnet-containing medicines included the SHINRYUKTANG, JIHWANGTANG, and INSAMBAEKHOTANG. Interestingly, it was revealed that some of the kings (Hyojong, Yungjo) in the era of Josun dynasty (1392- 1910) believed the efficacy of the magnet-containing medicine and took it for curing their health problems.