Sand casting is a kind of traditional casting aircraft that uses the sand as the main materials to produce casting mold.
Sand casting generally uses gravity casting. It can also apply low-pressure casting and centrifugal casting when there are special requirements. Sand casting has a wide adaptability, small, large, simple, complex, single parts, and large-quantities can use this casting..
Sand casting molds usually made by wooden materials, so it also named as wooden mold. So some sand casting manufactures often use the high size precision and long useful life aluminum alloy casting molds or resin molds, in order to avoid some short-comings of wooden molds, such as easily being damaged and easy to deform.
Although sand casting charges a lot, its price is still cheaper than the metal casting, It is outstanding in the small-quantity producing.
In addition, the sand casting enjoys higher refractoriness than the metal type. So some higher melting point materials, such as copper alloys, black metals, also apply the sand casting to make molds.
However, sand casting has some disadvantages. Because each sand mold can only be casted once, after casting parts being finished, the mold is damaged. So it need to reshape. That features makes the sand casting low-productivity. Because the sand has the nature of softness and being with a lot of holes, so sand casting is low in size precision , and is rough in its surface. So the factories need to improve the sand casting's external situations. Once these defects of sand casting being eliminated, the sand casting will be very perfect and popular in the casting field.