Sheet metal
A processing technology, 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, riveting, splicing, Forming (such as car body), etc. Its remarkable feature is that the thickness of the same part is the same.
Process characteristics
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. In computer cases, mobile phones, and MP3s, sheet metal is an essential part. As the application of sheet metal becomes more and more extensive, the design of sheet metal parts has become an 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 can meet the requirements of the product. Function and appearance requirements, but also make the stamping die easy to manufacture 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:
⒈ Ordinary cold-rolled sheet SPCC SPCC refers to the continuous rolling of steel ingots into steel coils or sheets of required thickness through a cold rolling mill. SPCC surface does not have any protection, it is easy to be oxidized when exposed to the air, especially in a humid environment, the oxidation speed is accelerated, dark red rust appears, and the surface should be painted, electroplated or otherwise protected when in use.
⒉ Galvanized steel sheet SECC The substrate of SECC is a general cold-rolled steel coil, which becomes an electro-galvanized product after degreasing, pickling, electroplating and various post-treatment processes in a continuous electro-galvanizing production line. SECC not only has the mechanical properties and similar processability of ordinary cold-rolled steel sheets, but also has superior corrosion resistance and decorative appearance. It has great competition and substitution in the market of electronic products, home appliances and furniture. For example, the commonly used computer case is SECC.
⒊ Hot-dip galvanized steel sheet SGCC Hot-dip galvanized steel coil refers to the semi-finished product after hot-rolling pickling or cold-rolling, after cleaning, annealing, and immersing it in a molten zinc bath with a temperature of about 460 ° C, so that the steel sheet is plated with The zinc layer is then tempered, leveled and chemically treated. SGCC material is harder than SECC material, has poor ductility (avoid deep drawing design), thicker zinc layer and poor weldability.
⒋ Stainless steel SUS301 The content of Cr (chromium) is lower than that of SUS304, and the corrosion resistance is poor, but it can obtain good tensile force and hardness after cold working, and has good elasticity. It is mostly used for shrapnel springs and anti-EMI.
⒌ Stainless steel SUS304 is one of the most widely used stainless steels. Because it contains Ni (nickel), it is richer in corrosion resistance and heat resistance than steel containing Cr (chromium). It has very good mechanical properties, no heat treatment hardening phenomenon, no elasticity. .