Sand casting is a process, which is used
to make or manufacture large components and equipment made out of
brass, aluminum, iron and bronze. The metal is first melted and then
gently poured into a mould, which is made up of sand.
The cavity
in the sand is made in the following method. The desired pattern is made
that is of wood or resin in whatever shapes that the sand caster wants
the part to turn out. In rare cases, the pattern may be made of metal.
This pattern is placed in a cavity in the sand. The cavity is usually
housed in a flask which is box like. The pattern is then packed into the
moist sand. The sand retains the shape of the pattern when it is
removed from the box. The person making the sand cast also will create a
reservoir called a riser into which excess molten metal can flow. A
second mold is made for the upper part of the sand cast in a similar
way.
As a cost-efficient casting method, sand casting is still
popular in China. Basically, it refers to make a sand mold with cavity
of casting shape inside. Then, we get the casing after pouring metal
into the cavity and metal solidifies. In sand casting plant, we have
both manual and semi-automatic sand casting
production lines for castings with various size, weight and geometries.
Besides, our sand casting capacity ranges from 3 lbs. to 2500 lbs.
Green
Sand Molding Process: This is the most cost-efficient method. In this
process, granular refractory sand is coated with a mixture of betonies
clay, water. We use resin or aluminum patterns to form the cavity.
However, the surface roughness and tolerance on green sand molding are
not as good as resin sand molding process.
Resin Sand Molding
Process: We also call this process as resin-bonded sand molding method.
Because of the resin-bonded sand, the sand mold is harder than green
sand molding. Additional burning of coated sand will make the sand mold
solid. This creates a good surface and tight tolerance for the casting.
However, this process will take more time and cost more than regular
green sand molding.
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