Common materials and drawing review of sheet metal processing

1. Common materials for sheet metal processing

1. Sheet metal processing galvanized steel sheet SECC

The substrate of SECC is ordinary 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.

2. Sheet metal processing 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.

3. Sheet metal processing hot-dip galvanized steel sheet SGCCHot-dip galvanized steel coil refers to the semi-finished product after hot-rolling pickling or cold-rolling, after cleaning, annealing, and immersing in a zinc-dissolving tank with a temperature of about 460 C, so that the steel sheet is plated with a zinc layer, and then conditioned and tempered. Flattened and chemically processed.

Sheet metal processing SGCC material is harder than SECC material, has poor ductility (avoid deep drawing design), thicker zinc layer and poor weldability.

4. Sheet metal processing stainless steel SUS304

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), has very good mechanical properties, has no heat treatment hardening phenomenon, and has no elasticity.

5. Sheet metal processing stainless steel SUS301

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

2. Drawing review of sheet metal processing

To write the process flow of the part, you must first know the various technical requirements of the part drawing; then the drawing review is the most important link in the compilation of the part process flow.

1. Check whether the drawing is complete.

2. The relationship between the drawings and views, whether the marking is clear and complete, and marking the unit of size.

3. Assembly relationship, assembly requires key dimensions.

4. The difference between the old and new layouts.

5. Translation of foreign language pictures.

6, table code conversion.

7. Feedback and handling of graphic problems.

8. Materials.

9. Quality requirements and process requirements.

10. The official release drawings must be stamped with the quality control seal.