Again the minimum inside bend radius is even larger when bending with the grain.
Bending aluminum sheet grain.
The grain direction is established during the metal rolling process.
You must pay careful attention to grain or rolling direction when bending high strength metals especially when trying to achieve a small inside bend radius.
A common way to prevent material failure or cracking is by bending the metal against the grain or perpendicular to the grain.
If you re bending 0 020 thick material use a 0 020 radius.
In other words if you re bending 1 8 sheet use a tool with a 1 8 radius to form the inside of the bend.
Bending the sheet metal longitudinally with the grain allows those grains to separate at the grain boundaries.
When bending high strength materials such as spring or high carbon steel you should orient the part so that it can be bent against the grain.
Bending with the grain gives a different result than bending against it.
The bend is along the long dimension.
That said forming with the grain takes less pressure to make a bend.
Bending with the grain also limits how tight of an inside bend radius you can achieve without cracking the outside of the bend.
Bending with the grain may result in cracking or.
Inside bend radius 0 19.
For 0 5 in thick 7050 aluminum the minimum bend radius may be specified as much as 9 5 times material thickness.
For most applications with stainless steel or aluminum you can get away with a zero radius bend on anything under 0 050 thick.
The trend is obvious.
Bend angles also can be less consistent.
Pieces 22 long by 1 75 wide by 0 63 thick.
The harder and thicker the plate is the greater the minimum bend radius.
Bending 2024 t3 grain direction considered.
Also know that for the best results and fewer cracks on the outside of the bend the bend line should go across or diagonal to the material grain when and where possible.
This is important to note especially with aerospace and aviation applications since bending with the grain or parallel to the grain direction can result in material failure.
