Minimum Bend Radius Formula For Sheet Metal

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Minimum bend radius formula for sheet metal.

The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. For this material this is the minimum producible inside radius with air forming. It shall be equal to three times of sheet thickness plus bend radius. The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels.

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. Bend radii minimum bend sizes. Minimum recommended sheet metal bend length minimum sheet metal flange bend length is required to avoid cracks in the bending area. For example in the case of 1 0mm plate to the edge distance 1 5 then the minimum z bending h 6 1 2 1 5 1 8 1 2 1 6 4.

So if the metal plate is 75 thick you would multiply 4 x 75 3 so your minimum inside bend radius would be roughly 3 times the thickness of the material in this case or 2 25. Assume the sheet of material is in pure bending i e no additional tension is applied during forming. The radius is produced as a percentage of the die opening regardless of the die style. I have already learned about the following formulas.

For a sheet metal stock with inch thickness determine the minimum tool radius for both the steel and aluminum alloys that will not tear the material. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. Minimum sheet metal flange bend length 3 x sheet thickness bend radius. However it is important to know that this is just a broadly applicable rule of thumb you can follow for making bends in steel.