水ガラスを粘結剤とした中子のガス圧
スポンサーリンク
概要
- 論文の詳細を見る
Gas defects such as blowholes and pinholes are often observed in iron castings cast in core molds made by the CO2 process. This study was undertaken to investigate the behavior of gas pressure within various types of CO2 mold cores. Gas pressure at various core portions during casting at 1,400°C were measured with a semiconductor pressure gauge developed in our laboratory. The cores used, which were 75mm in width, 150mm in length and 20mm in thickness had a core print on the open side for degassing. The factors in mold making such as sodium silicate content in the mold core, standing time in air and drying temperature after CO2 gassing were varied. The gas pressure-time curve in shell mold cores provided three peaks (peak; I, II, III), but the curve in CO2 mold cores provided only two peaks (peak; I, II). Peak II in the latter was much higher than that in the former. The difference in the peak height between the two types of cores may be attributed to vaporization of water, which easily vaporizes and is amply contained in the water glass. The CO2-passed core contained more water after being kept in a high humid environment than that after being kept in 60% humidity at 24°C. When molten iron was cast in the water-rich mold, the gas pressure exceeded the hydrostatic pressure of the molten metal, resulting in gas blowing which further caused gas defects in the casting. If the CO2 mold was kept in low humid condition for a sufficient period or dried at a temperature above 100°C, the water content in the mold decreased and led to the decrease of gas pressure generating in the mold core, thus preventing casting defects due to gas bubbling.
- Japan Foundry Engineering Societyの論文
Japan Foundry Engineering Society | 論文
- 球状黒鉛鋳鉄の延性破壊に及ぼす応力３軸度及び基地組織の影響
- 紡織機鋳物の鋳造法に就いて (其の一)
- 光ファイバで紫外線を導光した光造型機の開発と石こう鋳造への適用
- 薄肉球状黒鉛鋳鉄の黒鉛粒数に及ぼす元湯硫黄量，冷却速度及び希土類元素添加時期の影響
- Fe-Si合金及びFe-C-Si合金の塩浴窒化に及ぼすSiの影響とFe，Siの窒化物について