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회주철 브레이크 디스크 표면 미세조직 형상에 따른 절삭가공 특성 연구
이관형(Kwanhyeong Lee),김동민(Dongmin Kim),윤형준(Hyungjoon Youn),김동익(Dongik Kim),이흥주(Heungjoo Lee),이익희(Ikhee Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In this study, research the mechanism how machinability decrease on the brake disc surface along the state of skin layer microstructure. Representatively, It has been caused by free-ferrite rim and a few kind of carbide and oxide what existing about 0.3㎜ maximum from the surface. Free-Ferrite bring worse machining condition by making lower hardness and toughness increasing on the near surface, and also creating the diffusion wear in case of cutting with CBN bite. Furthermore, Oxide and carbide precipitate make harmful chipping on the both tool and work pieces. As a result, tool life has rapidly decreased based on these of complex reasons. Point of this study is finding out the correlationship between cutting force and abrasion characteristic when is given difference microstructure on skin layer by every 0.1㎜ depth from near surface.
내열성 및 강성을 만족하는 알루미늄 유니버셜 조인트 개발
강신재(Sinjae Kang),김범석(Beomsuk Kim),김동익(Dongik Kim),김태영(Taeyoung Kim),이흥주(Heungjoo Lee),이익희(Ikhee Lee),우종학(Jonghak Woo),신희택(Heeteak Shin),유용문(Yongmun Ryu) 한국자동차공학회 2020 한국 자동차공학회논문집 Vol.28 No.5
This paper introduces technologies relevant to the intermediate shaft of the steering column, namely a technology for improving the fatigue strength of the extruded aluminum steering shaft. Also introduced is the development status of the highly strengthened aluminum intermediate shaft and high-temperature-resistant materials. The existing aluminum alloy material can meet the requirement of ensuring the low weight of vehicles but it cannot ensure acceptable performance of the vehicle in a high-temperature environment. Therefore, this paper proposes an aluminum universal joint with satisfactory heat resistance and rigidity by changing the ratio of the alloy material components.