臥式預熱保溫爐是一臺容量可達600公斤的臥式有鐵芯工頻感應電爐,為了便于控制爐內熔融金屬的溫度,可以采用調壓變壓器進行保溫,但這種舊式設備操作麻煩,二來消耗電力多,設備占用面積也大,采用可控硅交流調壓器,操作簡單便利,而且能節約用電,一臺保溫爐比用調壓變壓器每晝夜可以節省300度電,又能為生產自動化創造了條件。
另外,由于升(sheng)(sheng)液(ye)(ye)管的(de)(de)工(gong)作條件惡劣,鑄造(zao)科(ke)技工(gong)作者正(zheng)在(zai)尋求更好(hao)(hao)的(de)(de)材料和合理的(de)(de)措(cuo)施以提(ti)高(gao)其(qi)(qi)壽(shou)(shou)命(ming)(ming)。現有(you)(you)資料表明:采(cai)用(yong)(yong)(yong)含磷2.7%的(de)(de)鑄鐵、含銅6.5%的(de)(de)鑄鐵、高(gao)錳鑄鐵或(huo)用(yong)(yong)(yong)具有(you)(you)D型石墨(mo)的(de)(de)珠光(guang)體基(ji)體的(de)(de)孕育鑄鐵鑄造(zao)升(sheng)(sheng)液(ye)(ye)管,其(qi)(qi)壽(shou)(shou)命(ming)(ming)可(ke)能延(yan)長,可(ke)用(yong)(yong)(yong)120h以上;有(you)(you)的(de)(de)采(cai)用(yong)(yong)(yong)普通鑄鐵管進(jin)行(xing)表面滲硫(liu)處理,在(zai)鋁(lv)(lv)液(ye)(ye)中(zhong)(zhong)的(de)(de)壽(shou)(shou)命(ming)(ming)約可(ke)提(ti)高(gao)3倍;有(you)(you)的(de)(de)在(zai)鑄鐵管表面噴鍍一層三(san)氧化(hua)(hua)(hua)二(er)鋁(lv)(lv)、氧化(hua)(hua)(hua)鋯(gao)或(huo)氧化(hua)(hua)(hua)鉻(ge)等材料,升(sheng)(sheng)液(ye)(ye)管在(zai)鋁(lv)(lv)液(ye)(ye)中(zhong)(zhong)的(de)(de)壽(shou)(shou)命(ming)(ming)可(ke)達(da)700h;有(you)(you)的(de)(de)試用(yong)(yong)(yong)氮化(hua)(hua)(hua)硅、碳化(hua)(hua)(hua)硅或(huo)氧化(hua)(hua)(hua)硼等耐熱陶瓷作升(sheng)(sheng)液(ye)(ye)管,雖然成(cheng)本高(gao),但在(zai)鋁(lv)(lv)液(ye)(ye)中(zhong)(zhong)可(ke)用(yong)(yong)(yong)半(ban)年(nian)以上;還有(you)(you)用(yong)(yong)(yong)石棉耐熱硅酸鹽作升(sheng)(sheng)液(ye)(ye)管,在(zai)三(san)班連續作業的(de)(de)情況(kuang)下,可(ke)使用(yong)(yong)(yong)4~5個(ge)月,效果良(liang)好(hao)(hao)。