网址：www.zaoxingji.com.cn 2020-05-13 作者：admin 阅读：
Fluidity of clay sand
The ability of molding sand to move between pattern and sand under the
action of external force or gravity is called flow ability. The mold
cavity with uniform compactness, clear contour, smooth surface and
accurate size can be obtained by the sand with good fluidity, which is
beneficial to prevent mechanical sand sticking, reduce sand tightening
time and improve productivity.
The sand with large particle size and small angle coefficient has good fluidity.
The properties and amount of binder also have a great influence on the
fluidity. It has been proved that the fluidity of Ca bentonite sand is
the best, that of common clay is a little less, and that of Na bentonite
is the worst. When the amount of original sand is fixed, the fluidity
can not be improved by increasing water content.
If the mixing time is too long, the clay sand will agglomerate. If the
mixing time is not enough to mix evenly, the fluidity will be
significantly reduced. The fluidity of molding sand without loose sand
treatment is also poor. Add diesel or heavy oil to improve the fluidity.