高强度灰铸铁皮带轮的生产工艺
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摘要
介绍了大型皮带轮的铸件结构及技术要求,详细阐述了该铸件的生产工艺:采用3 t中频感应电炉熔炼铁液,炉料配比为20%废钢屑压块+40%废钢块+20%HT250铁屑压块+20%回炉料+2%增碳剂+0.6%FeSi+0.6%FeMn;铁液过热到1 550℃,断电静置3～5 min,铁液出炉温度为1 450～1 500℃;采用包内冲入法进行孕育处理,孕育剂加入量为0.60%～0.80%,浇注温度为1 360～1 400℃。生产结果显示:A型石墨占90%以上,石墨片细小、弯曲,基体中珠光体体积分数达到93%～95%;抗拉强度达到278～310 MPa,硬度达到182～210 HB,符合技术要求,降低了生产成本。
The structure and technical requirements of large belt pulley castings were introduced,and the production process of the castings was described in detail:molten iron was melted in a 3 t medium frequency induction furnace,the melting charges were consisted of 20% steel scrap briquette+40% steel scrap block+20% HT250 gray iron chip block+20% foundry returns+2% carburetant+0.6% FeSi+0.6% FeMn,the molten iron was superheated to 1 550 ℃,power was cut off,molten iron was held in furnace for 3～5 min,tapping temperature was of 1 450～1 500 ℃,inoculation was carried out in the ladle with pour-over process,the inoculant amount was of 0.60%～0.80%,pouring temperature was in the range of 1 360～1 400 ℃. The production result showed:A-type graphite was more than 90%,the graphite flakes was small and curved,the volume proportion of pearlite in matrix reached 93%～95%,tensile strength reached 278～310 MPa,the hardness reached 182～210 HB,meeting technical requirements and reduce production cost.
The structure and technical requirements of large belt pulley castings were introduced,and the production process of the castings was described in detail:molten iron was melted in a 3 t medium frequency induction furnace,the melting charges were consisted of 20% steel scrap briquette+40% steel scrap block+20% HT250 gray iron chip block+20% foundry returns+2% carburetant+0.6% FeSi+0.6% FeMn,the molten iron was superheated to 1 550 ℃,power was cut off,molten iron was held in furnace for 3～5 min,tapping temperature was of 1 450～1 500 ℃,inoculation was carried out in the ladle with pour-over process,the inoculant amount was of 0.60%～0.80%,pouring temperature was in the range of 1 360～1 400 ℃. The production result showed:A-type graphite was more than 90%,the graphite flakes was small and curved,the volume proportion of pearlite in matrix reached 93%～95%,tensile strength reached 278～310 MPa,the hardness reached 182～210 HB,meeting technical requirements and reduce production cost.
引文
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[3]王顺安,邹荣剑.合成铸铁的生产及应用[J].铸造技术,2010,(08):1 090-1 093.
[4]李化芳,任立军,王年生.浅谈铸造企业节能措施[J].热加工工艺(铸锻版),2006,(04):98-99.
[5]赵群宪,牟志刚,张文磊,等.灰铸铁缸体气孔缺陷的防止措施[J].现代铸铁,2018,(01):42-45.
[6]王瑞冬,尹庆华.6DM3灰铸铁缸体材料质量稳定性的控制工艺[J].现代铸铁,2018,(02):27-30.
[7]王蒙.大型卧式加工中心床身铸件的铸造[J].现代铸铁,2017,(05):30-32.
[8]薛蕊莉,尤国庆.浅谈灰铸铁中Mn与S的控制[J].现代铸铁,2017,(05):33-37.