一、皮下气孔在铸件中的位置皮下气孔多发生在铸件浇注位置最高处的表皮下,有时也出现在气体上浮受芯子阻碍处(见图)。这种缺陷可在强力喷丸后检查出来,但通常是在切削加工后才能发现。二、皮下气孔特征这类气孔多呈球形,有时也出现不规则形状,内有渣粒,孔腔里有一层灰色或蓝黑色的衬壁,某些孔内还可能夹杂有小铁珠,这是在凝固过程中渗出的。 First, the location of subcutaneous stomata in the casting Subcutaneous stomata occurred in the castings the highest position below the epidermis, and sometimes appears in the gas floating by the core obstruction (see Figure). This type of defect can be inspected after shot peening, but it is usually found after machining. Second, the characteristics of subcutaneous pores These pores are mostly spherical, and sometimes irregular shape, there are slag particles, the cavity has a gray or blue-black lining, some holes may also be mixed with small iron beads, which Exudation in the solidification process.