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厚大球面瓦体内腔的“冷却水道”砂芯几乎全部被铁液覆盖,为便于清理而必须使用溃散性好的树脂砂,难以排尽含氮气体,要求在球面顶部安设尺寸足够大的冒口。主要为排气而安设的冒口(特别是冒口颈)尺寸难以确定,并对浇注温度要求苛刻,冒口底部气缩孔缺陷经常导致铸件返修或者报废。通过将原来的底注改为阶梯浇注,并在冒口底部合适位置安设内、外仿形冷铁等工艺改进,使上述缺陷得到很好的解决。
Thick spherical dome body cavity “cooling water ” sand core is almost all covered by liquid iron, in order to facilitate the cleanup and must use good resin sand, it is difficult to exhaust the nitrogen-containing gas, the required spherical top of the installation of sufficient size Big riser Mainly for the vent and set riser (especially the neck) size is difficult to determine, and the casting temperature demanding, the bottom of the riser hole defects often lead to casting repair or scrapped. Through the original note into a ladder pouring, and in the riser at the bottom of the appropriate place to install internal and external profiled cold iron and other process improvements, so that the above defects are well resolved.