The size of the bending R angle
When bending, the use of a bending tool and a smaller opening in the lower mold results in severe stress concentration on the aluminum plate, making it prone to cracking or fracture.
The direction of the grain pattern on the aluminum plate
The fibrous texture structure formed in the bending process of aluminum plates exhibits anisotropy in material mechanical properties due to its directionality. In practical operations, when the texture direction is parallel to the bending line direction, the tensile strength of the material decreases, resulting in fracture at the rounded corners. Therefore, it should be perpendicular to the texture direction of the aluminum plate.
The hardness of aluminum plate
Aluminum plates are prone to fracture due to their high hardness. This necessitates the selection of high-quality aluminum materials, primarily based on their grades and temper. Generally, the 1-series, 3-series, and 5-series are more commonly used; the 6-series and 7-series have too high a hardness and require annealing to the O temper before bending. Additionally, the quality of aluminum plates plays a role. Imported aluminum plates of the same model are less prone to cracking than domestic ones, but they are also significantly more expensive.
Aluminum plate parts that require brushing
If the process allows, it is best to bend and then stretch, otherwise the probability of bending fracture will increase
