Casting: a metal forming process in which a metal solution is directly injected into a casting mold to form a certain shape. The quality is almost poor.

Die casting: It is a kind of casting. If the solution naturally flows into the mold, the casting may have porosity defects, so inject the melt with a certain pressure, so the defects will be reduced accordingly.

Forging: a processing technology that enables castings or other workpieces to obtain better strength by tapping or other pressure shocks. The product obtained by this method is superior to the casting in performance and strength. For example, striking iron is a traditional forging process.

Stamping: Put an object with a certain shape under a punching machine, which is equipped with a die, and punch out the products designed in the die with a punch.