摘要
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。
Aimend at the problem that water cooling channel sand core in heavy sectioned spherical bush was almost encircled by molten iron, resin sand with good collapsibility was used to facilitate the clean-up. The sufficient sized big riser was used for exhausting nitrogen gas at the spherical bush top and feeding. However, due to difficulty to determine the size of riser, particularly the size of riser neck, and control pouring temperature, the shrinkage porous often appeared at the root of riser on casting which leads to repair or casting scraped. Aimed at this problem some technical measures were taken such as changing the original bottom filling to ladder filling, and using the outer and inner profiled chill irons at the bottom of riser, and other process improvements. These defects were well resolved.
出处
《铸造技术》
CAS
北大核心
2011年第12期1646-1648,共3页
Foundry Technology
关键词
球面瓦体
气缩孔
工艺改进
Spheri.cal surface bush
Gas and shrinkage porous
Process improvement
