How to prevent sand
holes in iron castings
As for the
resin sand molding, water glass
sand molding, although the intensity of
the two molding are very high,
sand holes will still appear in
Reason: Sand cleaning is not thorough.
There are residual sand in the mould.
Secondly, the liquid iron wash the wall
of mould to cause the sand runner.
iron foundries use
painting to prevent the brushing, which
takes the good results, but still there
will be sand holes. First, because the
brushing paint in the gates is more
difficult. The second is the high
pouring temperature, which cause paint
erosion, and high temperature immersion
will cause the sand holes too. Casting
plant did not attach great importance to
the gates design. Casting process
ignored the erosion of the runner wall.
All these factors lead to the casting
sand holes and sand trachoma.
Improving Method: Using the ceramic
pipes for the cast gates. This product
easy to be used, with smooth flow,
resistance to molten iron, molten steel
erosion, does not absorb liquid steel,
sawing of good features. You can
simplify the molding process,
eliminating the paint on the inside of
the gate, and the gating system to
improve the layout, to avoid sand
sand holes and sand defects in