The formation of veining is caused by cracks in the surface of the mold part that can be penetrated by the liquid metal. A number of measures have proven effective in the prevention of veining, and the most important ones are listed below.
An overview of the key measures for preventing veining
- Homogeneous distribution of the silica conversion of the entire particle size range by using sand with a low degree of uniformity
- Reducing the intensity of compaction
- Using a molding base material with higher thermal conductivity, which leads to a smaller stress difference in the grain bond and to faster solidification
- Using mold material additions (mineral or organic additives) from the extensive ASK Chemicals product range of additives
- Using suitable coatings
- Using suitable binders