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Sheet metal has not yet had a relatively complete definition. According to a definition in a foreign professional journal, it can be defined as: sheet metal is a comprehensive cold working process for metal sheets (usually below 6mm), including shearing, punching/cutting/compounding, folding, welding, riveting, Splicing, molding (such as car body), etc. Its notable feature is the uniform thickness of the same part.

Sheet metal has the characteristics of light weight, high strength, electrical conductivity (can be used for electromagnetic shielding), low cost, and good mass production performance. It has been widely used in electronic appliances, communications, automotive industry, medical equipment and other fields, such as in In computer cases, mobile phones, and MP3, sheet metal is an indispensable part. With the increasing application of sheet metal, the design of sheet metal parts has become a very important part of the product development process. Mechanical engineers must be proficient in the design skills of sheet metal parts, so that the designed sheet metal meets the requirements of the product. The function and appearance requirements can make the stamping die manufacturing simple and low cost.

The main purpose
There are many sheet metal materials suitable for stamping processing. Sheet metal materials widely used in the electronic and electrical industry include:

Folding ⒈ ordinary cold rolled sheet SPCC
SPCC refers to the continuous rolling of steel ingots through cold rolling mills into steel coils or sheets of required thickness. There is no protection on the surface of SPCC, it is easily oxidized when exposed to the air, especially in a humid environment, the oxidation speed is accelerated, and dark red rust appears. The surface should be painted, electroplated or other protections when in use.

Folding ⒉ galvanized steel sheet SECC
The substrate of SECC is ordinary cold-rolled steel coil, which becomes electro-galvanized products after degreasing, pickling, electroplating and various post-treatment processes on the continuous electro-galvanizing production line. SECC not only has the mechanical properties and similar processability of general cold-rolled steel sheet, but also has superior corrosion resistance and decorative appearance. It is highly competitive and replaceable in the market of electronic products, home appliances and furniture. For example, SECC is commonly used in computer cases.

Folding ⒊ hot-dip galvanized steel sheet SGCC
Hot-dip galvanized steel coil refers to the semi-finished product after hot-rolling and pickling or cold-rolling, which is cleaned and annealed, and then immersed in a molten zinc bath at a temperature of about 460°C, so that the steel sheet is coated with a zinc layer and then quenched and tempered It is made by leveling and chemical treatment. SGCC material is harder than SECC material, has poor ductility (avoid deep drawing design), thicker zinc layer, and poor electric weldability.

Folding⒋ stainless steel SUS301
The content of Cr (chromium) is lower than that of SUS304, and the corrosion resistance is poor, but it can get good tensile force and hardness after cold working, and it has good elasticity. It is mostly used for shrapnel springs and anti-EMI.

Folding⒌ stainless steel SUS304
One of the most widely used stainless steels. Because it contains Ni (nickel), it has better corrosion resistance and heat resistance than Cr (chromium) steel. It has very good mechanical properties, no heat treatment hardening phenomenon, and no elasticity.

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