Generally, 2.0 plates need 2mm holes, and 3.0 plates need 3mm holes to form thick plates. A large number of samples are required, and the sample loss is high, as long as it is considered that the prepared holes cannot be folded into ellipses due to bending. Generally, laser cutting can cut holes with a diameter greater than or equal to the thickness of the plate, and then process them after folding. But sometimes it depends.

Up to now, there is no relatively complete definition of sheet metal processing technology. According to a definition in foreign professional journals, it can be defined as: sheet metal is a comprehensive cold working process of shearing, punching/cutting/compounding, folding, riveting, splicing and forming metal plates (usually less than 6mm) (such as automobile bodies). Its remarkable feature is that the thickness of the same part is consistent.

Plate has the characteristics of light weight, high strength, conductivity (can be used for electromagnetic shielding), low cost and good mass production performance, and has been widely used in electronic appliances, communications, automobile industry, medical devices and other fields. For example, sheet metal is an indispensable part in computer cases, mobile phones and MP3 players. With the more and more extensive application of sheet metal, sheet metal design has become a very important part of product development. Mechanical engineers must master the design skills of sheet metal skillfully, so that the designed sheet metal can not only meet the requirements of product function and appearance, but also make the stamping die simple to manufacture and low in cost.