In the metal die casting process, molten metal is forced into two steel dies that make up a cast. It is generally used in a high-volume production setting and is well known for producing a high-quality, consistent product. Compared to processes that use sand molds, the equipment utilized for the low pressure die casting process usually has a higher initial cost.

Modern Methods

With the use of a vertical process that shoots the molten metal upward against gravity, the process of low-pressure die casting is performed. With the help of a piston, the metal travels from the furnace below, and through low pressure, it travels through a shot chamber into the two molds. The two molds are prepared from aluminum alloys; one is fixed whereas the other is capable to be pulled away to let the casting free itself from the mold once cooled. 

In the mold, the pressure is maintained while the metal cools to make sure an even and accurate fill. As the metal cools, any missed or shrinking cavities are further filled by molten metal. The slower casting cycle is the only downside of low pressure die casting process. But as compared to high-pressure die-casting this die casting process is a cheaper, less complicated technology, and lends itself to automation.