Table 1 preferred recommended 90 degree bend radii for various sheet metals.
Minimum bend radius steel sheet.
Recommended minimum bend radii for steel and aluminum.
Use this document to choose values that are both manufacturable and meet your needs.
It is possible to choose other bends if you require but additional lead time and tooling charges may apply.
The tables below show bend radii and minimum bend sizes for materials and tooling combinations stocked by protocase.
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Sheet metal bend radii if these guidelines are not followed more research and or some form of analysis may be requried.
The minimum inside bend radius is even larger when bending with the grain.
The minimum bend radius data shown in these charts is measured to the inside of the bend.
Since commercial sheet metal bending can be done with less concern for stresses caused during forming operation the radius can be near zero for thin sheet metal.
Minimum inside bend radius for sheet metal recommended inside bend radius for sheet metal parts should be equal to material thickness.
The problem with bending too tightly.
Crca inside bend radius equal to 0 65 times of sheet thickness is also enough.
This calculator predicts what the minimum bend radius should be to avoid chacking or orange peeling on the outside radius of the bend.
To keep it simple i also use a 2 mm inside radius.
I can now see that the minimum flange length is 8 5 mm for such a bend so i have to keep it in mind when designing.
We go beyond the general rules of sheet metal bending as our customers want tight bend radii for sheet metal parts.
The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels.
If a piece of material is bent too tightly problems can occur.
Bend radii minimum bend sizes.
In steel between 0 5 and 0 8 in.
Let s say i have a 2 mm thick sheet and i want to bend it.
This tool allows you to determine tonnage internal radius v die opening and minimum flange you just have to insert the characteristics of the sheet metal to be bent.
Aluminum where necessary 5052 h32 may be bent to 1t and 6061 t6 to 1 1 2t.
Here again a minimum bend radius is not necessarily the same thing as a sharp bend.
Each and every bend in a piece of sheet metal has a certain minimum internal radius that needs to be taken into account when planning the design of a sheet metal form.
But for harder materials e g.
Thick grade 350 and 400 may have a minimum bend radius of 2 5 times the material thickness when transverse bending while longitudinal bending may require a minimum bend radius that s 3 75 times the material thickness see figure 1.
