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마찰교반용접시 Al 6061의 파괴인성의 평가에관한 연구
윤재영,송주현 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.6
In this study, we investigated the change in fracture properties after friction stir welding on Al606. In the L-T direction test, the fracture toughness of the unwelded base material was 275 MPa, and the specimen subjected to friction stir welding (FSW) was 227 MPa, showing that the fracture toughness decreased significantly with friction stir welding. In the T-L direction test, the difference between the base material and the weld material was not large, but the fracture toughness was shown to decrease during welding. In the comparison of the L-T direction and the T-L direction, it was found that both the base material and the weld material showed high fracture toughness in the L-T direction.In this study, the following conclusions were obtained after friction stir welding of Al 6061-T6.
마찰교반용접이 Al합금에 미치는 기계적 성질의 변화에 관한 연구
송주현,윤재영 한국기계기술학회 2021 한국기계기술학회지 Vol.23 No.6
In this study, the following conclusions were obtained after friction stir welding of Al 6061-T651. 1) The organization of the welding unit is largely divided into four parts, the Stir zone, themal-mechanical affected zone, heat affected zone, it was confirmed that it is clearly separated into the material portion. 2) As a result of observing the hardness test results of the welding unit, the minimum hardness value was about 45Hv, which was significantly lower than the hardness of the base material about 72Hv. 3) The tensile strength of the welding part was about 2/3 compared to the tensile strength of the base material.
밀리미터파 간섭계용 타원 반사경의 공구 변화에 따른 고속절삭 특성 연구
이상용(Sang-Yong Lee),김건희(Geon-Hee Kim),김효식(Hyo-Sik Kim),양순철(Soon-Cheol Yang),홍창덕(Chang-Deoc Hong),조병무(Byung-Moo Cho),원종호(Jong-Ho Won) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
This study aims to find the optimal cutting conditions, when ellipse mirrors consisted Aluminum alloy were made it the Millimeter-Wave Interferometer System mirror with several tools on the High-Speed Machine. Machining technique for precision machining characteristics of ellipse mirrors consisted Al6061 matter by Ball endmill is reported in this paper. , Results of machining on the High-Speed Machine(using NCD(Natural Crystalline diamond), WC and coated TiAlN ∅6㎜ ball endmill tool) had measurement of surface roughness and form accuracy with cutting conditions(the Feed rate, the Depth of cut and the Cutting speed). the Millimeter-Wave Interferometer System ellipse mirror had been machined foundational precision machining characteristics of aluminum.
김진수(Jin Su Kim),김용조(Yohng Jo Kim) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
The cutting performance of a developed small-angle spindle tool was investigated with Al6061 using a TiAlN coated high-speed steel end mill. Up-cut and down-cut processes in a milling machine were carried out at the range of 1000–4000 rpm for spindle speed and 50–300 ㎜/min for feed rate. As a result, the highest cutting force in the Fx direction was obtained from the up-cut process when the spindle speed was 1000 rpm and the feed rate was 100 ㎜/min. In the Fy direction, the highest cutting force appeared in the up-cut process at a feed rate of 250 ㎜/min at the same spindle speed. Conversely, the lowest cutting force came out in the up-cut process at a spindle speed of 4000 rpm and a feed rate of 50 ㎜/min. As for surface finish, the finest surface roughness was obtained as Ra 0.7642 ㎛ at a spindle speed of 4000 rpm and a feed rate of 50 ㎜/min. Consequently, given the cutting performance of the developed small-angle spindle tool, we conclude that its use in industrial practice is feasible.