气孔是金属中的气体存在的结果。
其原理是把金属粉末作为添加剂混入到树脂结合剂中，在修整砂轮后进行电解处理，使其表层的金属成分溶解，形成气孔。
Its principle is adding the metal powder into the resin binder as addition, then electrolyzing after addressing the wheel, so that the metal content can be dissolved and the pinholes are formed.
气孔是压铸生产中的常见问题，导致这一缺陷的原因之一就是在慢压射过程中压室内的金属液流动卷入了气体。
The air entrapment of the liquid metal flow in the shot sleeve during the slow shot phase is one of the factors resulting in this kind of defect.
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