问:我厂生产的铸铁件经常产生气孔缺陷,一般是何原因,应怎么解决?江西省新余农机厂答:铸铁件中的气体有两个来源:一是铁水本身熔炼过程吸收的气体,冷却时析出成气泡留在铸件中,二是外界气体,如型腔内气体、型砂中的水分、粘结剂及涂料发出的气体等.根据一般县级铸工车间的情况,分析产生气孔的主要原因是:①型砂粉尘太多,膨润土被烧 Q: My factory production of cast iron often produce stomatal defects, what is the reason, how to solve? Xinyu Agricultural Machinery Factory in Jiangxi Province A: There are two sources of gas in the cast iron: First, the hot metal melting process to absorb the gas, cooling When the precipitation into bubbles left in the casting, the second is outside the gas, such as the cavity gas, water in the sand, adhesives and coatings issued by the gas, etc. According to the general situation of county-level casters workshop, analysis of the main causes of stomatal Is: ① sand too much dust, bentonite is burned