研究論文
マイクロ鋳造品の湯流れに対する濡れの影響
2015 年 87 巻 1 号 p. 46-51
詳細
2015 年 87 巻 1 号 p. 46-51
Fluidity in micro-castings was investigated using a 0.1mm thick plate mold cavity poured through a 1.0mm diameter gate in plaster molds with phosphor bronze and Sn-11mass%Cu alloy. The influences of the pouring temperature, pouring pressure, mold temperature, and surface tension on the fluidity were discussed using a dental casting machine. The surface tension was changed by the addition of sulfur into the phosphor bronze.
The results showed that fluidity was mainly controlled by the solidification of liquid metal except when the mold temperature exceeded the melting temperature of the metal. If the temperature was above the melting temperature of the metal, all the liquid metal flowed backwards into the gate due to the pressure difference within the plate and gate based on wettability, namely the surface tension. Therefore, the most suitable mold temperature for the micro-castings was just lower than the melting point of the metal for filling the cavity completely.
