Minimum Bend Radius Formula For Sheet Metal

Use this document to choose values that are both manufacturable and meet your needs.

Minimum bend radius formula for sheet metal.

For this material this is the minimum producible inside radius with air forming. The radius is produced as a percentage of the die opening regardless of the die style. Discover all our calculation tools in the calculators section of the top menu. Minimum recommended sheet metal bend length minimum sheet metal flange bend length is required to avoid cracks in the bending area.

Large radius bending also known as r bending large radius bending is when the inside radius is greater than 8 times the material thickness. If you are working with a material thickness of 0 100 in multiply that by 0 63 to get a minimum inside bend radius of 0 063 in. 6 t 2 edge distance of v groove 1 8 t 2 t see the picture. Kink a light bend typically between 5 and 15 which is used to stiffen a flat piece of metal.

The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels. However it is important to know that this is just a broadly applicable rule of thumb you can follow for making bends in steel. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. 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. Minimum sheet metal flange bend length 3 x sheet thickness bend radius. It shall be equal to three times of sheet thickness plus bend radius. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.

The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. 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. Leg length of the workpiece from the edge to the outside tangent point of the bend radius. 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.