使鋁板折彎后開裂的幾個主要原因及注意事項：
Several main reasons and precautions for cracking of aluminum plate after bending are as follows:
1、鋁板的硬度
   1. Hardness of aluminum plate
鋁板硬度太高，很容易開裂。這就需求挑選質量好的鋁板，主要看鋁板合金和狀態。通常1系列、3系列、5系列的對比常用，6系列、7系列的硬度太高，要先做退火處理到O態后才好折彎。還有即是鋁板的質量。
   aluminum plate has too high hardness and is easy to crack. This requires the selection of good quality aluminum plate, mainly depends on the aluminum plate alloy and state. Generally, the comparison of 1 series, 3 series and 5 series is commonly used. The hardness of 6 series and 7 series is too high, so it is necessary to conduct annealing treatment to o state before bending. There is also the quality of aluminum plate.
2、鋁板的厚度。
   2. Thickness of aluminum plate.
太厚的鋁板不好折彎，我們一想就理解，盡量運用薄一點的鋁板。
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3、折彎R角的巨細
   3. The size of bending R angle
折彎R角越大，那成功率就越高，所以盡量調大折彎R角越大。
   the larger the bending R angle, the higher the success rate, so try to increase the bending R angle to increase the greater.
4、鋁板紋理方向。

折彎方向要與鋁板紋理方向垂直，不能平行。
   the bending direction should be perpendicular to the grain direction of aluminum plate, not parallel.
需求拉絲的鋁板零件，在工序答應的情況下佳是折彎后再拉形，否則會添加折彎開裂的概率。
   for aluminum plate parts requiring wire drawing, the best way is to stretch after bending when the process is allowed, otherwise the probability of bending cracking will be added.
鋁板生產廠家
Aluminum plate manufacturer
是狀態重要了
  first of all, state matters
狀態分為全硬、半硬、軟態（通常軟態叫O態），全硬的折彎效果基本不太行（鋁板狀態是H18、H19、H38等都是全硬的），半硬狀態的鋁板基本上都可以折彎（H24的也就是半硬的）。O態的折彎是肯定沒問題，但是由于太軟了，基本上用這種狀態的來折彎的比較少。
   state is divided into full hard, semi-hard and soft state (usually soft state is called o state). The bending effect of full hard is not very good (aluminum plate state is h18, H19, h38, etc.) and aluminum plate in semi-hard state can be basically bent (H24 is semi-hard). O-state bending is certainly no problem, but because it is too soft, basically using this state to bend less.
其次是你要選擇純鋁還是合金鋁
   next, do you want pure aluminum or alloy aluminum
純鋁硬度不是很高，用1100、1050、1060等等都可以，推薦用1100  H26的合金鋁硬度好一點，可以用3003、3005、5052等半硬狀態的都可以的。
   the hardness of pure aluminum is not very high. 1100, 1050, 1060 and so on can be used. It is recommended to use 1100 H26 alloy with better hardness, and 3003, 3005, 5052 and other semi hard states can be used.
具體情況建議試樣再確定，如果用6061、2024、7075由于硬度太高，特別是T6狀態的更是，應該折彎不了，除非加溫再折，質量好的鋁板與質量差鋁板的區別是氧化性能、公差、表面效果、晶精度及均勻穩定性等有區別的，單單折彎效果區別不大。
    it is suggested to re determine the sample. If 6061, 2024 and 7075 are used, the hardness is too high, especially for T6 state, it should not be bent. Unless the aluminum plate with good quality is re folded after heating, the difference between good quality aluminum plate and poor quality aluminum plate is oxidation performance, tolerance, surface effect, crystal precision and uniform stability, but the bending effect is not different.