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탈수소 열처리 공정에 의한 원심주조 메탈베어링의 제조 시스템
김정훈(Jeung-Hun Kim),김충구(Chung-Gu Kim),변재영(Jea-Young Byen),이은숙(Eun-Suk Lee),양지웅(Ji-Yung Yang),최원식(Won-Sik Choi) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.5
Centrifugal casting is suitable for producing hollow-products using centrifugal force. Bush type metal bearings are the key parts that facilitate the rotational movement of various machinery. Metal bearings produced by conventional centrifugal casting machines show rotational imbalance. Therefore, after injecting a large amount of material, the product"s precision is secured in the secondary processing. Rotational imbalance is caused by the force acting on the rotary disc plate. In order to minimize rotational imbalance, NASTRAN was used for the optimal design and structural analysis. It was concluded that the rotating plate of the conventional centrifugal casting machine should be prevented from tilting. For this purpose, the location & thickness of the stiffeners were obtained through the optimum design. In the conventional centrifugal casting machine, both ends of the product are lower in temperature than the center part, so internal stress occurs. This solves this problem by inserting a heating coil into the rotating plate.