The Introduction Of Sand Casting and Die Casting

What is the casting?

To be simple, the molten metal is poured into a preformed shell and then you will get a desired part after cooling and cutting of the outer shell. The use of this casting process solves the machining problem for the part with complex surfaces, and in the meantime the production efficiency is improved a lot. Depending on the different material of the pattern, there are Sand Casting and Lost Wax Casting. Here we will discuss how these two kinds of casting process differ.

In brief, Lost Wax Casting uses wax to make the pattern. After dipping into a slurry of silica, outside the mould there is a strong shell. Then heating the shell to melt the wax and leave an empty cavity. Liquid steel is poured into the cavity. Because of the good surface quality and precise measurements, lost wax casting is also called Precision Investment Casting. 

For Sand Casting, the patterns can be made from many different materials such as wood, metal, synthetics, expendable polystyrene (EPS), and etc.. The metal is melted in the furnace and then ladled and poured into the cavity of the sand mold. This casting process is relatively simple and cost saving but typically has a low production rate.

Compared with sand castings, die casting parts require little or no secondary machining because the net shape is achieved; Die Casting process can make parts with thinner walls; can have nearly all holes cored to size; can be held within much closer dimensional limits; Die castings are processed at very high rates of production because thousands of die castings can be made in dies without replacement. Die Casting parts have much smoother surfaces and closer tolerances.

After over ten-years’ rapid developing, Sieg-Huao has become a professional Die Casting manufacturer with rich production experience. If you have parts need to be casted, if you have problems with sand casting, you can contact us and we are your good choice!