차량용 납전지 전극 제조 금형의 유로 설계를 위한 수치 연구

다국어 초록 (Multilingual Abstract)

A numerical study is conducted on a die-casting process to produce the lead electrodes employed in car batteries. The primary concern is to reduce the processing time by enhancing cooling performance. The proposal is to employ a recursive cooling passage characterized by dual spiral channels, which overcomes the spatial restriction in the mold. A three-dimensional CFD model based on the ANSYS package is constructed to simulate the transient cool-down process from the molten-state lead to a solid product, in which the solidification process is included. The turbulent flow of water in the cooling channel and the conjugate heat transfer in the mold are examined. The preliminary computations for the mold with the conventional straight cooling channels illustrate that the required cool-down performance is hardly attainable even for high flow rate of water. The computations for the mold with spiral channels show that the spiral passage provides an augmentation of cooling performance even for a moderate flow rate. The cooling performance increases and the temperature uniformity decreases as the inclination angle of the spiral cooling passage. This suggests that an optimal selection of the inclination is needed to satisfy the both requirements for processing time and temperature uniformity.