Sheet metal bending is an important sheet metal process because it requires no tools to draw various part geometries, and has fast delivery times, high repeatability, and a high degree of automation. It also allows products to be fabricated from a single piece of metal, using plastic deformation rather than welding or riveting to connect multiple components together, thereby reducing costs, improving strength, and simplifying assembly.

1. Cracks appear at the bending angle

The two main reasons for cracks in tensile parts are poor metal flexibility and small bending radius. To avoid these defects, use softer metal or increase its ductility by heating and then slowly cooling.

2. Unstable bending angle

The main reasons for these defects are insufficient material pressure and irregular compression buckling caused by irregular bending pressure. Asymmetric die fillets can also cause this problem. To solve this problem, it is necessary to increase the jacking force and balance the gap in the rounded corners of the male and female molds.

3. Hole deformation

The position of the hole can be deformed during bending due to friction between the surface of the concave mold and the outer surface. This defect can increase the friction between the above surfaces by increasing the pressure on the ejecting plate or by adding a hard point to the plate, so that they do not slide.

4. Uneven bottom of concave plate

Such defects are usually caused by the use of an ejection device, insufficient stress, or uneven material. Therefore, ensure that the ejection device is set to the correct unit of force, or that it is completely removed, and that the material is evenly leveled before starting the bending process.

5. Non parallel bending to the middle of the hole

This defect is due to the fact that the bending height is smaller than the minimum bending height limit, resulting in curve expansion and deformation. These types of defects can be resolved by simply raising the height of the bent piece or material.