影响铸造生产的因素比较复杂,所以铸件易于产生各种各样的缺陷。铸件缺陷的名目较多,铸铁件常见的缺陷有气孔、缩孔、缩松、变形、裂纹、夹砂、冲砂、粘砂等,这里着重讨论灰铸铁件产生气孔的原因和防止方法。把铁水浇注到铸型中去会产生大量的气体,其中有型腔中的空气,型砂中水分蒸发的水蒸气,煤粉和涂料所挥发的气体以及铁水本身析出的气体等。如果这些气体进入到铁水内部而在铁水凝固前不能逸出,那么在铸件中便 Factors affecting the casting production is more complex, so casting prone to a variety of defects. Casting defects more names, cast iron parts common defects are pores, shrinkage, shrinkage, deformation, cracks, sand, sand, sticky sand and so on, here focuses on gray iron castings causes and prevent methods. Pouring hot metal into the mold produces a large amount of gas, including air in the cavity, water vapor that evaporates from the sand, gas volatilized from the pulverized coal and paint, and gas that has been released from the molten iron itself. If these gases enter the interior of the hot metal and can not escape before the hot metal is solidified,