Encyclopedia of metal forming methods

Die casting (note that die casting is not short for pressure casting) is a metal casting process characterized by the use of a mold cavity to apply high pressure to molten metal. Molds are usually machined from stronger alloys, a process somewhat similar to injection molding.

Sand casting is the use of sand to make molds. Sand casting involves placing a finished part model or a wooden model (pattern) in the sand, then filling the pattern with sand over the weekend, and unpacking the pattern to form a mold. In order to take out the mold before casting the metal, the mold should be made into two or more parts; during the mold making process, the holes and vent holes for pouring the metal into the mold must be left to synthesize the casting system. The mold is kept for an appropriate time after the metal liquid is poured until the metal solidifies. After the parts were taken out, the molds were destroyed, so a new mold had to be made for each casting.

Investment casting, also known as lost wax casting, includes processes such as pressing wax, wax repairing, tree forming, dipping, wax melting, molten metal casting and post-processing. Lost wax casting is to use wax to make a wax mold of the part to be cast, and then coat the wax mold with mud, which is a mud mold. After the clay mold is dried, it is fired into a pottery mold. Once fired, all the wax molds are melted and lost, leaving only the pottery molds. Generally, the pouring port is left when the mud mold is made, and then the molten metal is poured from the pouring port. After cooling, the required parts are made.