The thickness of sheet metal parts is usually below 6mm. The prominent feature of sheet metal parts is that the thickness of the same part is consistent. Sheet metal parts have the characteristics of light weight, high strength, conductivity (can be used for electromagnetic shielding), low cost, and good mass production performance. They have been widely used in fields such as electronic appliances, communication, automotive industry, medical equipment, etc. For example, they are commonly used in computer cases, mobile phones, and everyday items such as chimneys, iron barrels, fuel tanks, oil pots, and car casings.