Sheet Metal Bending Radius Calculation

The values of the setback bend allowance and bend deduction can be calculated from the sheet thickness bend radius bend angle and k factor.

Sheet metal bending radius calculation.

Sheet metal calculator bend allowance equations and calculator. You just have to insert the characteristics of the sheet metal to be bent. To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r. Die edge radius in.

With this free online tool we quickly get the sheet metal bend deduction and therefore the sheet metal blank initial flat length from the finished part measurements. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. And by having t and the sheet thickness t we can calculate the k factor as follow.

Radius metal will crack at the outside heel of the bend. There are four methods for finding bend allowances. The mold line lengths are the distances measured to the outside mold line and are equal to the flange lengths plus the setback. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.

Ultimate tensile strength psi. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels. Learn more about bending.

Punch edge radius in. This tool allows you to determine tonnage internal radius v die opening and minimum flange. You only have to insert interior angle flange lengths k factor inside radius and material thickness. This page also includes a link to a on line sheet metal bend allowance calculator.

To calculate r which is the radius of the arc on the neutral axis we can use the following equation. Reflex angle a geometry term for an angle which is greater than 180 sharp bend when the radius of the bend is less than 63 of the material thickness seen commonly with hemming applications. When bends are made smaller than the required min. Cells on the right will output the desired values.

The most important considerations when bending metal is the min. Bend radii minimum bend sizes. Use this document to choose values that are both manufacturable and meet your needs. Like previous scenarios let s start by calculating leg length 1.

Sheet metal bending parameters calculator. The material thickness will be measured in decimal form not by the gauge number. R bending bending with an inside radius greater than 8 times the material thickness. A is the bending angle in the above equation so.