对于熔模精密铸件内腔的型壳残砂和氧化皮,一般采用喷砂、抛丸或碱煮的方法来清理。这些办法效率较低,而且不易清理干净。我们根据兄弟厂的经验, 自一九七○年以来,使用了苛性钠融盐化学清理工艺,取得了较好的效果。这种方法,能把复杂、弯曲和细小型腔的残留型壳以及铸件内外表面的氧化皮清理得十分干净,提高了效率,满足了零件的质量要求。 Casting precision castings cavities shell residual sand and scale, the general use of sandblasting, shot blasting or alkaline boiling method to clean. These methods are less efficient and less easy to clean up. Based on the experience of our brother factory, we have used caustic soda chemical cleaning process since 1970 and achieved good results. This method can be very complex, curved and small cavity residual shell and the outer surface of the casting clean oxide scale is very clean, improve efficiency, to meet the quality requirements of the parts.