在熔模铸件中,采用水玻璃做粘结剂的部分厂家,出现了一种铸造缺陷。这种缺陷凹入铸件,形成高低不平的瘤状物,类似蟾蜍皮。分布在模组中各零件的底部外侧。 该缺陷严重影响着铸件表面质量,有时甚至造成大批铸件报废。 此类缺陷对球形及圆柱形铸件来说特别敏感,而且多出现在夏季,冬季很少出现。 Casting investment in the use of water glass as a binder part of the manufacturers, there has been a casting defect. This defect concave castings, the formation of rugged tumor, similar to the toad skin. Distributed in the module outside the bottom of each part. The defects seriously affect the quality of the casting surface, and sometimes even caused a large number of castings scrapped. Such defects are particularly sensitive to spherical and cylindrical castings, and appear more in the summer, rarely in winter.