Forgings: can be divided into hot forgings, warm forgings and cold forgings. Hot forgings heat metals above the recrystallization temperature, and the melting temperature is below 200 degrees, and most steels are between 850- 1200 degrees. There is a layer of gray skin on the surface of the hot forging, which is smoother than the casting. Warm forgings heat the metal to recrystallization temperature, and the surface of cold forgings is smoother and not heated. They are all formed in the mold with a press or other equipment. Forgings have a crunchy knocking sound.
Stamping parts: metal plates are formed by molds.
Die casting: liquid metal is pressed into a mold with a smooth surface.
Generally speaking, the C content of castings is higher than that of forgings, with high hardness, poor toughness and good comprehensive properties of forgings. Castings can be made into very complicated parts.
Forgings are made of molds with upper and lower dies, so there is a parting line. And has a draft angle. Castings are also made by molds. In order to take the wooden mold out of the cavity, it is necessary to make a hatchback mold, so there is also a parting line.
Stamping parts have no parting line.