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我厂生产的长江—750型摩托车发动机汽缸铸件结构复杂,散热片多而薄,铸件壁厚不均匀,最厚处达24毫米,最薄处仅2毫米。同时对铸件的金相显微组织、硬度、化学成分和表面质量均有较高的要求。为生产优质铸件,要求铁水有高的出炉温度和良好的流动性,化学成分稳定。为了获得优质铁水,我们以前采用三节炉—电弧炉双联熔炼,熔化工艺复杂,生产效率低,工作环境差,劳动强度大。随着近年来生产任务的不断增加,这种工艺根木不能适应生产的要求。为此,我们自行设计制造了一台活动炉底倒置大间距两排主辅风口热风冲天炉。投入生产几年来,取得了较为满意的效果。
I plant the Yangtze River -750-type motorcycle engine cylinder casting complex structure, more and thin heat sink, uneven casting wall thickness, the thickest at 24 mm, the thinnest Department only 2 mm. At the same time, the metallurgical microstructure, hardness, chemical composition and surface quality of castings have higher requirements. For the production of high-quality castings, hot metal requires a high temperature and good liquidity, chemical composition and stability. In order to obtain high-quality hot metal, we have previously used three-furnace - electric arc furnace double melting, complex melting process, low production efficiency, poor working environment, labor-intensive. With the increasing production tasks in recent years, this process can not meet the production requirements. To this end, we have designed and manufactured an activity of the inverted bottom large two-row main and auxiliary air outlet hot cupola. In the past few years, it has achieved satisfactory results.