鋳鉄凝固時の膨張圧力

概要

論文の詳細を見る
Cast iron undergoes volume expansion during eutectic solidification by the segregation of graphite. When this expansion is restrained by mold walls, an internal pressure is generated within the casting. Since this pressure depends on the freezing manner of cast iron, it will provide a clue in predicting the quality of cast iron. This paper describes the measurement of the pressure change in castings poured into a graphite mold by an oil pressure gauge. Pressure changes in the castings were analysed from the pouring temperature up to the completion of the A1 transformation, and the effectt of the composition of the melt and mold capacity on the pressure changes were examined. The pressure in the castings rises as high as 50kg/cm2 under certain conditions. The behaviour of solidification of cast iron can be surmised from the features of the pressure time curves recorded. The pressure in castings increases with increasing C.E.-value in the hyper-eutectic range and decreases with increasing C.E.-value in the hyper-eutectic range, that is the pressure is highest in iron with eutectic composition.
Japan Foundry Engineering Societyの論文