我厂生产的SN10－10型基座铸件,是少油断路器上的重要零件之一,其材质为QT50－5,采用煤粉砂湿型、合脂油砂芯,立式压迫浇口。长期以来,由皮下气孔引起的废品率相当高,特别是雨季,有时高达40%。针对这种情况,我们进行了不断地总结和探索,已初步摸到了皮下气孔出现的原因,并找到了一 The SN10-10 base castings produced by our factory are one of the important parts of the less oil circuit breaker. The material is QT50-5, which is made of coal powder sand wet type, synthetic oil sand core and vertical compression gate. For a long time, the rate of rejection caused by subcutaneous stomata is quite high, especially in the rainy season, sometimes as high as 40%. In response to this situation, we conducted a continuous summary and exploration, has initially touched the subcutaneous stomata appeared and found a