When metal processing parts or designing sheet metal parts, it is often encountered that the aluminum plate cannot be bent, and the bending cracks. Sheet metal processing arranges some aluminum plate materials that can be bent. The aluminum for bending mainly depends on the state of the material. The state is divided into full hard, semi-hard and soft state (usually the soft state is called O state).

The bending effect of full hard aluminum is basically not good (the state of the aluminum sheet is H18, H19, H38, etc. are all hard). The aluminum plate in the semi-hard state can basically be bent (H24 is also semi-hard) O-state bending It is definitely no problem, but because it is too soft, basically there is less bending in this state. When processing sheet metal parts, it is still rare to use pure aluminum materials. Basically all alloy aluminum (because the hardness of pure aluminum is not very good).

Alloy aluminum is used as sheet metal parts, and 3003, 3005, 5052 and other semi-hard state can be used as sheet metal bending parts. If 6061, 2024, and 7075 are used due to their high hardness, especially those in T6 state, they should not be bent unless they are heated and then bent. The difference between good aluminium plate and poor aluminum plates is oxidation performance, tolerance, surface effect, and crystal accuracy. and uniform stability, etc., there is little difference in the bending effect alone.

The bending coefficient of aluminum for bending is basically close to that of carbon steel (the bending coefficient table of aluminum plate can be found in "Sharing the bending coefficient table of aluminum plate in sheet metal processing", and the bending coefficient table of carbon steel can be found in "Sheet metal bending coefficient table and use" Method"), a simple algorithm can be used: plate thickness x 1.6, that is to say: 1mm 5052 aluminum plate is bent, one bend, the outermost dimension plus the outermost dimension minus 1.6mm is the unfolded length. Bending should be done against the grain as much as possible. The aluminum plate has rolling grains. It is best for the bending tool to intersect the rolling grains at 90 degrees, and it is not easy to crack.