Calculating Developed Length For Sheet Metal Bends

Therefore the bend allowance added to the flange lengths is equal to the total flat length.

Calculating developed length for sheet metal bends.

Ultimate tensile strength psi. R is inner bend radius. The formula for calculating sheet metal bending allowance is please refer to the above picture. Sheet metal flat length can be calculated in the following three simple steps.

Cells on the right will output the desired values. 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. Calculate the value bend allowance for required sheet metal bend by using below formula. You only have to insert interior angle flange lengths k factor inside radius and material thickness.

We can calculate the leg length 1 and 2 as follows. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows. Bend allowance ba π 180 r k t a.

At the neutral axis we have. We know that ba is the length of the arc on the neutral axis. Die edge radius in. In this formula the initial length is 300 mm.

Where ba is bend allowance. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. Ba bend angle π 180 r k factor t eqn 1.