The improvement measures taken for flange castings with air holes include the following:
1. Changing the sand mold brushing method
The method of applying sand mold paint has been changed from overall spraying with water-based paint to overall spraying with water-based paint and partial manual brushing with alcohol based paint. When applying alcohol based paint by hand, it should be ignited in a timely manner after applying the paint to ensure the drying of these two deep holes.
2. Reduce the gas emission of cold core box sand core
By adjusting the proportion of resin components in the cold core box sand core to ensure that the tensile strength of the sand core is ≥ 1MPa, adjust the proportion of components to reduce gas generation.
3. Reduce gas generation of sand mold
Due to the use of coated sand for the upper columnar core and the inner cavity oil channel core. On the premise of ensuring the basic strength required for sand core circulation and use, it is advisable to develop low gas generation coated sand with a gas generation rate of around 12g/ml.
