Several main reasons and precautions for cracking of aluminum plate after bending:
Hardness of aluminum plate
The hardness of the aluminum plate is too high and it is easy to crack. This requires the selection of high-quality aluminum plates, mainly depending on the alloy and state of the aluminum plates. The hardness of the 6 series and 7 series is higher than that of the 1, 3, and 5 series. It needs to be annealed to the O state before it can be bent. There is also the quality of the aluminum plate.
The thickness of the aluminum plate
Too thick aluminum plate is not easy to bend, we understand it as soon as we think about it, and try to use thinner aluminum plate.
The distance of bending R angle
The larger the bending R angle, the higher the success rate, so try to increase the bending R angle as much as possible.
Aluminum plate texture direction
The bending direction should be perpendicular to the grain direction of the aluminum plate, not parallel
For aluminum sheet parts that require drawing, it is best to be bent and then stretched when the process permits, otherwise the probability of bending and cracking will be increased.
First of all, the status is the most important
The state is divided into full hard, semi-hard, and soft state (usually the soft state is called O state), the full-hard bending effect is basically not good (the aluminum plate state is H18, H19, H38, etc. are all hard), and the semi-hard state Almost all aluminum plates can be bent (H24 is also semi-rigid). Bending in the O state is definitely no problem, but because it is too soft, basically it is less bending in this state.
The second is that you have to choose pure aluminum or alloy aluminum
The hardness of pure aluminum is not very high. You can use 1100, 1050, 1060, etc., it is recommended to use 1100 H26 alloy aluminum with a better hardness, and you can use semi-hard conditions such as 3003, 3005, 5052.
It is recommended that the sample be determined for specific conditions. If 6061, 2024, 7075 are used because the hardness is too high, especially the T6 state, it should not be bent. Unless it is heated and then bent, the difference between a good quality aluminum plate and a poor quality aluminum plate is If there are differences in oxidation performance, tolerance, surface effect, crystal accuracy and uniform stability, the difference in bending effect alone is not big.