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怎样稳定地生产高强度灰铸铁,是我国铸造工作者面临一个重要课题。对于生产内燃机类的薄壁高强度零件的单位来说,解决这一问题更显得迫切和重要。我厂是生产汽车用柴油机的单位,柴油机的机体,缸盖和飞轮罩等零件的主要壁厚大都在5～8毫米的范围内,且铸铁牌号要求较高,均在 HT20-40以上缸盖的铸铁牌号大于 HT25-47。铸工车间使用两座熔化率为3吨/小时的两排大间距冲天炉熔化铁水,用光学高温计测得的铁水出炉温度为1410～1460℃,炉前用粒度为4～15毫米。含硅量为75%的硅铁
How to produce high-strength gray cast iron steadily is an important issue for foundry workers in our country. It is even more urgent and important to solve this problem for units that manufacture thin-walled, high-strength parts for internal combustion engines. I plant is the production of automotive diesel engine units, diesel engine body, cylinder head and flywheel cover and other parts of the main wall thickness mostly in the range of 5 to 8 mm, and cast iron grades require higher, are more than HT20-40 cylinder head The cast iron grades greater than HT25-47. Casting workshop using two melted rate of 3 tons / hour of two rows of large-spaced cupola melt molten iron, with an optical pyrometer measured hot metal temperature of 1410 ~ 1460 ℃, before the furnace with a particle size of 4 to 15 mm. Silicon content of 75% silicon