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냉간단조 공정을 적용한 크랭크 샤프트 스프로켓의 기계적 특성 연구
임홍섭(Hong sup Yim),이혜경(Hyae Kyung Yi),이성문(Sung Mun Lee),문영훈(Young Hoon Moon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Recently, it is attempted to automotive parts by various cold forging methods to meet requirements of mass production and qualities. Compared to hot forged products, cold forged products reveal higher strength and better mechanical properties. In this study, the properties according to forging process type are analyzed for crank shaft sprocket. Cold forged crank shaft sprocket was evaluated surface hardness, micro structure and surface residual stress. Analyzed micro structures and mechanical properties of cold forged crank shaft sprocket were compared with that of conventional hot forging process.
레이저 직접금속성형기술을 이용한 금형재 표면보수 특성 연구
손영명(Young-Myung Son),장정환(Jeong-Hwan Jang),주병돈(Byeong-Don Joo),임홍섭(Hong-Sup Yim),문영훈(Young-Hoon Moon) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.7
Direct laser metal forming technology was applied to restore the damaged mold surface. In order to estimate melting characteristics of the 20 ㎛ Fe-Cr-Ni powder, single layer experiments were performed at various levels of heat input. The process window of the 20 ㎛ Fe-Cr-Ni powder provided feasible process parameters for the smooth regular surface. The cross hatching scanning strategy on the multiple layer experiment was performed to reduce the thickness non-uniformity of edge portions compared with the one direction scanning. To estimate the coherence between the melted powder and the basematal, the tendency of hardness distribution has been observed. The hardness of the melted and the remelted zone was distributed from 400HV to 600HV. It is over 2 times compared of the hardness of the basemetal. Experimental results show that the mold restoring process using direct laser metal forming can be successfully applied in the mold repair industry.