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球墨铸铁轧辊的补缩,一般是采用砂型明冒口和浇注后每隔20—25分钟用过热铁水点冒口1—2次的办法解决,这样的工艺使冒口金属消耗量占轧辊毛重的15％左右。为了节约金属和提高轧辊上辊颈质量,本研究工作是采用铝型膨胀发热剂单独使用或与绝热套组合成的保温冒口,以取代原工艺以稻草灰覆盖的干砂型冒口。经过实验室及现场对此实验表明:采用保温冒口以后,球墨铸铁共晶凝固时间延长了33—62％,缩孔形状由倒锥形变为盆形,轧辊冒口的致密段高度增加,省去了用过热铁水点冒口的工序。冒口高度可以降低25～50％,节约冒口金属量20～50％。研究工作表明:采用保温冒口是解决球铁轧辊补缩的最合理、经济而简便的措施。
Nodular cast iron roll of the general, is the use of sand Ming riser and pouring every 20-25 minutes with hot metal hot water riser 1-2 times to solve this process so that riser metal consumption accounted for the gross weight of the roll About 15%. In order to save the metal and improve the roll neck quality, the research work is to use the aluminum expansion heat-generating agent alone or in combination with thermal insulation set of riser to replace the original process covered with straw ash dry sand risers. After laboratory and field experiments show that: After the use of thermal riser, the ductile iron eutectic solidification time is extended by 33-62%, the shrink hole shape from inverted cone into a basin, the riser of the dense section of the height increases, the province Go to the process of using hot metal point riser. Riser height can be reduced 25 ~ 50%, saving riser metal 20 ~ 50%. Research shows that: the use of thermal insulation riser is to solve the most reasonable iron bowl roller, economic and simple measures.