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송기환,이상훈,손창우,서형진,서태일,유화열,박성학,김경훈,Song, Gi-Hwan,Lee, Sang-Hun,Son, Chang-Woo,Seo, Hyoung-Jin,Seo, Tae-Il,Yoo, Wha-Wul,Park, Sung-Hak,Park, Kyung-Hoon 한국금형공학회 2015 한국금형공학회지 Vol.9 No.3
Non-pneumatic wheels have been widely used instead of general tube type wheels beause of many reasons, for example, wheel size, price restriction, heavy-duty problem and so on. Almost small size wheels or casters were non-pneumatic type but structural stability was not certified. This paper presents a double structured non-pneumatic wheel, called "smart caster", which consisted with inner and outer wheels connected by chips, and finite element analysis processes were conducted in order to determine important dwsign factors before actual design for mass production. For structural analysis ABAQUS was used under various boundary conditions with incrementally varied loads until 2,000N. Then structural staility was evaluated according to varied loads below ultimate stress. Generally stresses were concentrated at the lower parts of the wheel, and especially contact parts between wheel and ground. In addition, maximum stress appeared at contact parts between the wheel lower part and chips.
유한요소법을 이용한 세미 파인-블랭킹 금형 해석에 관한 연구
이상훈,송기환,손창우,서형진,서태일,Lee, Sang-Hun,Song, Gi-Hwan,Son, Chang-Woo,Seo, Hyoung-Jin,Seo, Tae-Il 한국금형공학회 2016 한국금형공학회지 Vol.10 No.1
Metal sheet forming has been commonly used as the core technology in manufacturing parts of automobiles. It guarantees the highest production rate due to the process of mass production employing the press die. For precision of the product, the accuracy of the molds and its mechanic structures are considered as essential factors. One of these is fine blanking, which is utilized for the production of the metal sheet spring, with which clear sheer surfaces can be achieved in one operation from the materials. However, the current designs of press dies perform the forming analysis with the molds of rigid body, so they are focused on weight lightening by a rule of thumb. Therefore, this paper practice structural analysis about developing the semi fine-fine blanking technology. The semi fine-blanking can be run through the combination of the hydraulic cylinders and normal presses, so this paper analyze the amount of deformation according to the oil pressure. In addition, based on the plasticity of 50CrV4, the materials of the mold parts, the structural analysis and life analysis are proceeded, so they are expected to be useful as data for manufacturing the mold.