湿砂型铸铁件的粘砂缺陷--湿砂型铸铁件缺陷讲座(一)

介绍湿砂型铸铁件机械粘砂和化学粘砂的区分方法，各种因素对机械粘砂的影响，包括：砂型紧实度、浇注温度、型砂的粒度和透气性、砂型涂料等。煤粉是防止粘砂和改善表面光洁度的主要型砂加入物。对煤粉的质量、有效煤粉含量、煤粉的代用品以及煤粉的补加量等问题进行了详细的的分析讨论。

Penetration/Burn-in Defects of Green Sand Mold Iron Castings

The methods to differentiate between the penetration defect and burn-in defect of green sand mold iron castins were introduced, and influences of some process factors on penetration defect were described including:mold density,pouring temperature, sand grain size and permeability,paintings of the mold, and so on .The coal dust is the main mold sand additive to prevent penetration/burn-in and improve the surface fineness. Some problems such as quality of coal dust, active coal dust content, substitute for coal dust,and supplementary addition amount were analyzed and discussed in detail.