If a piece of material is bent too tightly problems can occur.
Bend radius for steel sheet.
The most common problem with bending a piece of sheet metal too tightly is.
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.
You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.
The bending radius must be at least 0 8 t to 2 t for sheet steel.
The bend radii listed are standard minimum if manufacturing for aircraft and aerospace applications.
In a previous bending basics article you mention a material s tensile reduction percentage used for calculating the minimum inside bend radius of various metals.
Most frequently expensive sheet metal bending tools called brakes are used to bend sheet metal but you can also complete this task without one.
Minimum sheet metal bend length recommendations.
Bending sheet metal by hand is a manageable task if the piece of sheet metal is small and thin enough to handle.
The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.
Larger bend radii require about the same force for bottoming as they do for air bending however smaller radii require greater force up to five times as much than air bending.
To keep it simple i also use a 2 mm inside radius.
Bend radii minimum bend sizes.
We go beyond the general rules of sheet metal bending as our customers want tight bend radii for sheet metal parts.
Let s say i have a 2 mm thick sheet and i want to bend it.
It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.
It is possible to choose other bends if you require but additional lead time and tooling charges may apply.
You described a rough rule to find a steel s minimum bend radius.
The minimum bend radius data shown in these charts is measured to the inside of the bend.
Bend radius throughout the sheet metal design is kept constant to take the advantage of using the same tool during manufacturing.
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.
Divide 50 by the material s reduction percentage as specified by the material supplier subtract by 1 and then multiply by the plate thickness.
Minimum sheet metal flange bend length is required to avoid cracks in the bending area.
Use this document to choose values that are both manufacturable and meet your needs.
The tables below show bend radii and minimum bend sizes for materials and tooling combinations stocked by protocase.
The material thickness will be measured in decimal form not by the gauge number.
