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我厂生产的薄壁复杂件 CA-15气缸盖最薄处壁厚5.5mm,最厚处螺栓孔搭子φ24mm。材质为 HT20—40,铸件重37kg。水套泥芯用合脂砂。采用垂直阻流式浇注系统,在气缸盖螺栓孔搭子的底箱外型部位安放冷铁,使铸件保持同时凝固。潮模平浇平冷。铸件经加机工后,要求在3～4kg/cm~2水压下保持3分钟不得渗漏。我厂的渗漏率较高,有时竟达到70～80％。后来,采用了严格控制炉料、提高铁水出炉温度、用稀土合金处理铁水、加强炉前孕育处理、适当低温快浇、改进砂芯结构和取消外冷铁等综合措
I plant the thin-walled complex parts CA-15 cylinder wall thickness of the thinnest 5.5mm, the thickest bolt hole take φ24mm. Material for the HT20-40, casting weight 37kg. Water jacket mud core with sand. Vertical flow blocking casting system, the cylinder head bolt hole to take the shape of the end of the outer box to place chill iron, so that the casting to maintain at the same time solidification. Tidal flat pouring flat cold. Casting by the machine, requiring 3 ~ 4kg / cm ~ 2 water pressure for 3 minutes without leakage. I plant a higher rate of leakage, and sometimes actually reached 70 to 80%. Later, using a rigorous control of charge, raise the temperature of the hot metal out of molten iron, rare earth alloy treatment of hot metal, strengthen the furnace precooked treatment, appropriate low temperature fast pouring, sand core structure to improve and eliminate the outer cold iron and other comprehensive measures