Calculating Developed Length For Sheet Metal Bends

We can calculate the leg length 1 and 2 as follows.

Calculating developed length for sheet metal bends.

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 bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. Cells on the right will output the desired values. By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows.

Die edge radius in. If the value of sheet metal k factor and bending flange length is known. Punch edge radius in. At the neutral axis we have.

Bend allowance ba π 180 r k t a. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. R is inner bend radius. Where ba is bend allowance.

Sheet metal flat length can be calculated in the following three simple steps. Ba bend angle π 180 r k factor t eqn 1. Ultimate tensile strength psi. Bend angle represents the angle to which sheet metal has bend here it is 90 degree.

The formula for calculating sheet metal bending allowance is please refer to the above picture. In this formula the initial length is 300 mm. You only have to insert interior angle flange lengths k factor inside radius and material thickness.