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재제조에서 제품 해체 및 재조립 공정의 상해 위험성평가
정재영,박상진,손우현,목학수,Jeong, Jae Yeong,Park, Sang Jin,Son, Woo Hyun,Mok, Hak Soo 한국안전학회 2018 한국안전학회지 Vol.33 No.2
In this paper, we focused on the safety of workers in a remanufacturing process where a risk analysis is not carried out and suggested a criteria for evaluating injury risk. We analyzed a disassembly and a reassembly, which are important for the remanufacturing process. The disassembly includes the disassembly of product and the disassembly process of part and the reassembly includes only reassembly of part. First of all, we analyzed the remanufacturing process and a type of injury. Then, we reviewed the standards and determined the criteria for a severity and an occurrence. We set a bigger weight for the severity to allow the greater impact. And the injury risk score was defined as a sum of the weighted severity and the weighted occurrence. We conducted a qualitative analysis of the experience of field workers based on the criteria we set up. Questionnaires for the evaluation were formulated through interviews with experts.
Al-Si-Mg계 주조합금의 미세조직에 미치는 Ti 및 Sr첨가 영향
정재영,김경현,김창주,Jeong, Jae-Yeong,Kim, Gyeong-Hyeon,Kim, Chang-Ju 한국기계연구원 1990 기계연구원소보 Vol.20 No.-
This investigation was undertaken to establish the technologies of grain refinement and modification, and to characterize material properties, essential for high quality aluminum alloy castings. Grain refinement seldom changed DAS and eutectic Si size, but largely decrease grain size. The variations of grain size induced by grain refinement had a great influence on the elongation without changes in the tensile strength or yield strength. The optimum Ti level lies between 0.1% and 0.16% to achieve the best possible mechanical properties. DAS and grain size were little affected, but eutectic Si size was greatly refined by modification. The variation of eutectic Si size had a great effect on the elongation, impact value, fracture toughness and fatigue crack propagation rate without changes in the tensile strength or yield strength. The Sr content of 0.015% is optimum to modification.