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球墨铸铁轧辊的补缩,一般是采用干砂型明冒口、稻草灰复盖保温和浇注后每隔2分钟用铁水点冒口1～2次的办法解决。这种补缩工艺消耗金属量较多,使冒口重约占轧辊毛重的15％左右。为了节约金属和提高轧辊上辊颈质量,采用铝型或硅型膨胀发热剂单独使用或与绝热套组合成的保温冒口,以取代原工艺稻草灰保温干砂型冒口。实验结果表明:采用新的保温工艺后,球铁共晶凝固时间延长了33～62％,冒口高度可降低25～50％,可节约冒口金属20～25％,经工厂上千吨轧辊的生产实践证明:发热保温冒
Nodular cast iron roll of the general, is the use of dry sand-type Ming riser, straw ash covered insulation and pouring every 2 minutes with a molten iron riser 1 or 2 times solution. This shrinkage process consumes more metal, so riser re-account about 15% of gross weight of the roll. In order to save the metal and improve the roll roll neck quality, the use of aluminum or silicon expansion agent alone or with insulation sets of insulation riser to replace the original process of straw ash insulation dry sand riser. The experimental results show that the new eutectic process can prolong the eutectic solidification time by 33-62%, reduce the riser height by 25-50%, and save 20-25% Production practice shows that: fever insulation take