摘要
介绍了#120皮带轮的铸件结构及生产工艺,对出现的过冷石墨进行原因分析,并提出了相应的改进措施：（1）加大废钢和石墨增碳剂的加入比例;（2）避免熔炼温度过高,严控熔炼时间和出铁温度,延长浇包烘烤时间,并用铁液烫热浇包2-3次,保证浇包的温度;（3）将始浇温度提高至1 425±10℃;改进孕育方法,加强孕育;（4）加厚加高边角薄壁部位,减小薄、厚部位差别,减少铸件的尺寸偏差,加大铸件的加工余量,使铸件石墨过冷层能够更好地被加工掉。生产结果显示：铸件边缘石墨形态得到明显好转,铸件边缘3 mm外已基本无E型石墨,再未发生因过冷石墨而产生的铸件批量报废现象。
The casting structure and production process of #120 belt wheel was introduced. The cat, ses of subcooled graphite was analyzed and the improvement measures were raised：（ 1 ）Increasing the proportion of scrap steel and graphite carburant. （2）Avoiding high temperature melting and strictly controlling tile melting time and temperature of mohen iron, prolonging the heating time of pouring ladle and warm it with melted iron for 2-3 times.（3 ）Increasing the starting pouring temperature to 1 425±10 ℃, improved inoculation method,strengthen the inoculation.（4）Increasing the thin part and reducing the thick part to redtn＇e the size changes and inereasing the machining allowance to cut the subcooled graphite surface off. Production rest, its shown that the graphite morphology of the edge of the casting was obviously improved. Type E graphite could not observed at the 3mm snrface layer. There was no castings be declared worthless by subcooled graphite.
出处
《现代铸铁》
CAS
2016年第4期36-41,共6页
Modern Cast Iron
关键词
灰铸铁
皮带轮
过冷石墨
熔炼工艺
gray cast iron
belt wheel
cold graphite
melting process
