Sheet metal, a processing technology, has not yet had a relatively complete definition of sheet metal. 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/compositing, folding, riveting, splicing, Forming (such as car body). Its remarkable feature is the same 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 is widely used in the fields of electronics, telecommunications, automotive industry, medical equipment, etc.
In computer cases, mobile phones, and MP3s, sheet metal is an indispensable component. With the increasing use of sheet metal, 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 design of sheet metal meets the product. The functions and appearance requirements make the stamping die simple to manufacture and low in cost.
There are many sheet metal materials suitable for stamping processing. Sheet metal materials widely used in the electrical and electronic industry include:
1. Ordinary cold-rolled sheet SPCC SPCC means that the ingot is continuously rolled into a coil or sheet of the required thickness by a cold rolling mill. The SPCC surface does not have any protection. It is easily oxidized when exposed to air, especially in humid environments. It has a dark red rust and should be painted, plated or otherwise protected during use.
2. The substrate of SECZ SECC SECC is a general cold-rolled steel coil. After continuous degreasing, pickling, electroplating and various post-treatment processes, the continuous electro-galvanizing line becomes an electro-galvanized product. SECC not only has the mechanical properties and approximate processability of general cold-rolled steel sheets, but also has superior corrosion resistance and decorative appearance. It has great competitiveness and substitution in the market of electronic products, home appliances and furniture. For example, SECC is commonly used in computer cases.
3. Hot dip galvanized steel sheet SGCC Hot dip galvanized steel coil refers to the semi-finished product after hot rolling pickling or cold rolling, which is washed, annealed, immersed in a molten zinc bath at a temperature of about 460 ° C, and the steel sheet is plated. The zinc layer is then quenched and tempered and chemically treated. SGCC materials are harder and less ductile than SECC materials (avoiding deep draw design), thicker zinc layers, and poor weldability.
4. The content of stainless steel SUS301 Cr (chromium) is lower than that of SUS304, and the corrosion resistance is poor. However, after cold working, it can obtain good tensile force and hardness, and has good elasticity. It is mostly used for springs and EMI.
5. Stainless steel SUS304 One of the most widely used stainless steels, because it contains Ni (nickel), is more resistant to corrosion and heat than steel containing Cr (chromium). It has very good mechanical properties, no heat treatment hardening, no elasticity.