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와이어 컷 방전가공기를 이용한 초경합금의 최적 가공조건에 관한 연구
윤기만(Gi-Man Youn) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.2
Hard metal has generally many difficulties in manufacturing and induces severe tool wear in general machining process. In order to solve these difficulties, wire electrical discharge machine among nontraditional processes is possible machining process. The removal rate is increased when no load voltage and on time are going up, on the other hand removal rate is decreased when no load voltage and on time are going up.
A6061-T6 합금의 마찰 교반 용접 시 공구 이송 속도에 따른 용접부 인장강도 특성 연구
윤기만(Gi-Man Youn) 산업기술교육훈련학회 2020 산업기술연구논문지 (JITR) Vol.25 No.4
In this study, FSW experiments using a commercial machining center (instead of an FSW-only experimental device) were conducted on the most widely used A6061-T6 alloy among aluminum alloys to assess the welding possibilities with this alloy. More specifically, the study aimed to establish a correlation between the tensile strength characteristics of welds when the transfer velocity of the tool (a representative process variable that is highly correlated with productivity) changes. Test results showed that under all conditions, the weld surface was not defective and the tensile strength of the welds exceeded 70% over the base material. Results also showed that the highest tensile strength was achieved under the 300-mm/min supply speed condition of the tool and with 85% of the base material. The study thus revealed that the greater the transfer velocity of the tool in the friction cross-plate of the A6061-T6 alloy, the greater was the tensile strength of the welds.
알루미늄합금의 마찰 교반 용접 시 공구 회전속도 변화에 따른 강도 특성 연구
윤기만(Gi-Man Youn) 산업기술교육훈련학회 2019 산업기술연구논문지 (JITR) Vol.24 No.4
This paper investigated the effect of the change in the rotational speed of a friction-crossing tool of aluminum 6061 alloy, on the tensile strength of welds; the material used in the experiment was rolled sheet metal with a thickness of 2 mm. In the experimental conditions, the rotation speed of the tool was fixed to 100 mm/min and the rotation speed of the tool was increased by 500 rpm from 1000 rpm to 4000 rpm for welding. Tensile testing of the welds resulted in fracture in the as region under all conditions. The tensile strength of the welds was more than 70% of the tensile strength of the parent metal under most conditions. At 2500 rpm, the tool had the highest tensile strength value of 80% relative to the parent steel.