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在无锡青铜铸件生产中发现,壁薄铸件冒口下部易发生缩孔、厚壁大件冒口下易产生疏松。尽管采用铁模铸造和放有较大冒口,此类疵病仍不断发生。另外,该种铸件易产生气孔,从铸件底部向冒口根部气孔逐渐增多。 例如1962年我厂生产了一批总重达5吨的铜套(材质ZQAI9-4和ZQAI10-3-1.5,单件重10～25公斤),尽管放了约占铸件重量1/3的大冒口,仍因补给不良而导致了大量废品,缩孔状况如图1。
Found in the production of bronze castings in Wuxi, thin walled castings tend to occur under the riser shrinkage, thick-walled large risers prone to loose. This type of flaw continues to occur despite the use of iron mold casting and larger risers. In addition, the kind of cast easy to produce pores, from the bottom of the casting to the riser root stomata gradually increased. For example, in 1962 I produced a total of 5 tons of copper sleeve (material ZQAI9-4 and ZQAI10-3-1.5, single weight 10 ~ 25 kg), despite the cast about 1/3 Riser, still due to poor supply caused a lot of waste, shrinkage situation as shown in Figure 1.