从机床床身裙部取出气孔缺陷试样,利用扫描电子显微镜和电子探针进行了分析,认为缺陷是由于硫化锰夹杂物折出、使铁中渣或氧化物容易与碳作用所形成,其中碳不一定来自凝固中铸铁中的石墨,脱落的铸型涂料涂层中的碳分也能参与反应生成气体。在分析结果的基础上,提出了相应的改进措施。 The stomata defect samples were taken from the machine bed skirt and analyzed by scanning electron microscopy and electron probe. The defect was due to the dislocation of manganese sulfide inclusions, which made the slag or oxide in iron easy to form with carbon. Among them, The carbon does not necessarily come from the graphite in the solidified cast iron, and the carbon content in the exfoliated mold coating can also participate in the reaction to produce gas. Based on the analysis results, the corresponding improvement measures are put forward.