湿砂型铸铁件的砂孔和渣孔缺陷——湿砂型铸铁件缺陷讲座(二)

Sand Indusion and Slag Inclusion Defects of Green Sand Mold Iron Castings

湿砂型铸铁件产生砂孔和渣孔缺陷的主要原因是:(1)芯头或砂台的间隙偏小;(2)浇注时铁液清渣不良;(3)砂型表面耐铁液冲刷性能较差;(4)脱模剂使用不当;(5)手工开挖浇注系统;(6)型砂强度和韧度欠佳。对影响型砂强度和韧度的因素进行了分析,并提出改进方向。

The reasons causing sand inclusion and slag inclusion are: ( 1 ) gaps between mould and core prints or cods too small; (2)poor slag.skimming of the molten iron during pouring; (3 )poor anti-washing resistance of the mold surface; (4)using stripping agent not correctly; (5) manually digging out gating system; (6) strength and toughness of the molding sand not enough. The factors influencing the strength and toughness of the molding sand were analyzed, and the direction of their improvement was also pointed out.