Knowledge of Sheet Metal Parts Processing
What is SECC sheet metal? SECC sheet metal is a comprehensive processing technology for thin metal plates (usually less than 6mm), including shearing, punching, cutting, compounding, folding, welding, riveting, splicing and forming and parts made by those technologies.
Ⅰ. The characteristics of SECC sheet metal
1. Uniform thickness. For a part, the thickness of all parts is the same.
2. Light weight, high strength, electrical conductivity, low cost, and good mass production performance.
Ⅱ. The processing technology of SECC sheet metal
1. SECC sheet metal processing technology: shearing
The equipment of the shearing process of SECC sheet metal is a shearing machine, which can shear a sheet of metal into a basic shape.
Advantage: low processing cost;
Disadvantages: general accuracy, shearing with burrs, and shearing shapes are simple rectangles or other simple shapes composed of straight lines.
The unfolded size of the part needs to be calculated before the shearing process. The unfolded size is related to the bending radius, the bending angle, the material and the thickness of the sheet.
2. SECC sheet metal processing technology: punching
The equipment of the punching process is a punching machine, which can further process the sheared material into shape. Punching various shapes requires different molds. Common molds have round holes, long round holes and bosses; the accuracy is higher.
Boss: the material is not removed. Note that the height of the boss is limited, which is related to the material and the thickness of the sheet, and the angle of the slope of the boss.
There are many kinds of bosses, including heat dissipation holes, mounting holes and others. Due to the influence of bending, the distance between the edge of the design hole and the edge of the sheet and the bending will be restricted.
3. SECC sheet metal processing technology: laser cutting
Processing equipment: laser cutting machine.
For materials that cannot be removed by cutting or punching processes, or plates that are harder and easy to damage the Mold, such as those with rounded corners, or when there is no ready-made mold to punch the required shape, laser cutting can be used to complete the forming of the material before bending.
Advantages: cutting without burrs, high precision, can cut any shapes, such as the shapes of leaves, flowers, etc.;
Disadvantage: high process cost.
4. SECC sheet metal processing technology: bending
Processing equipment: bending machine, veneer reeling machine.
They can fold or roll the metal sheet into the required shape, which is the forming process of parts; The process of cold pressing the sheet metal by the upper and lower cutter of the bending machine is called bending.
5. SECC sheet metal processing technology: surface treatment
As the SECC sheet metal is thin, it is not suitable for hot-dip galvanizing. Common surface treatment methods include phosphating and electrostatic spraying, which uses a black plate whose surface material is untreated.