Gravity casting also touches the mold. Traditional molds are made of wood, but there are many drawbacks, so they have gradually been eliminated. Instead, the aluminum alloy mold or resin mold with high dimensional accuracy and long service life, although the price is slightly increased, the effect is very good. Since each sand mold can only be used for casting once, the casting is damaged after it is produced, so it has to be recast, and the resulting work efficiency is much lower; and the sand itself is soft and porous, so the casting size The accuracy will also decrease and the surface will look rough. But I believe that with the continuous advancement of technology, these shortcomings can be overcome, and the processed products will be more perfect.
In the process of making gravity casting, each time it is poured, the surface of the mold is coated with a coating. Also cool the mold temperature. In actual work, the above requirements are usually solved by immersing the mold in a paint tank (graphite sink). The role of graphite: graphite is a heat-resistant substance, separating high-temperature copper water from the mold to protect and extend the life of the mold; graphite powder is very fine, which can increase the fluidity of copper water and make the product easy to cast.
In the process of manufacturing aluminum alloy gravity casting, the aluminum alloy of the raw material has high density and good toughness, and has good wear resistance and heat treatment in the process of use. The gravity casting of aluminum alloy can effectively improve the strength of the product after heat treatment. .
Castings of aluminum alloy gravity casting have good compactness and can be cast to a certain extent. The temperature and cooling temperature of the casting need to be appropriate, so that the pores and burrs and cracks can be reduced to a certain extent, and the machine is reduced.
Aluminum alloy gravity casting has less casting process, and can effectively reduce the manufacturing cost to a certain extent during the process of use. The product is safe and environmentally friendly in the process of production. The great advantage of the product in the process of use is the mold. Can be used repeatedly.