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应用扫描电子显微镜和电子探针，对压铸铝合金轮毂机械加工表面上的针孔作了显微分析。结果表明：针孔是铸件中的显微缩孔及夹杂在机加工中暴露所致。
Microscopic analysis of pinholes on the machined surface of die-cast aluminum alloy wheels was performed using scanning electron microscopy and electronic probes. The results show that pinholes are micro-cavities and inclusions in the castings that are exposed during machining.