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关于湿型铸钢件皮下气孔形成的研究,一直为人们所重视,国内外有关这方面的报导不少,但论点不一。一般认为:1.铸型水份高,透气性低;2.钢液中气体含量高(氢、氧、氮);3.其它因素:铸件壁厚、合金成分等的影响。我厂红岩CQ261重型汽车铸钢件采用湿型生产。最大重量为253公斤,壁厚8～50毫米,多为壳型、支架型复杂件。皮下气孔是造成废品率高、而又长期未能解决的难题,尤其是加工面多、铸造工艺较复杂的后轮毂、中减壳、后减壳三个重要件更为严重。
The research on the formation of subcutaneous stomatal of wet cast steel has always been valued by people. There are many reports about it in this area at home and abroad, but the arguments are different. Generally believed that: 1. Mold high moisture, low permeability; 2 gas content of liquid steel (hydrogen, oxygen, nitrogen); 3. Other factors: casting wall thickness, alloy composition and so on. Our factory Hongyan CQ261 heavy duty steel castings using wet type production. The maximum weight of 253 kg, wall thickness of 8 to 50 mm, mostly shell type, stent-based complex pieces. Subcutaneous stomatal is the problem that causes high scrap rate but can not be solved for a long time. In particular, the three important parts of the rear wheel hub with more processing surface, more complicated casting process, middle reduction shell and rear reduction shell are even more serious.