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.

Calculating developed length for sheet metal bends.

Punch edge radius in. We can calculate the leg length 1 and 2 as follows. At the neutral axis we have. Calculate the value bend allowance for required sheet metal bend by using below formula.

Sheet metal flat length can be calculated in the following three simple steps. Bend angle represents the angle to which sheet metal has bend here it is 90 degree. In this formula the initial length is 300 mm. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.

Bend allowance ba π 180 r k t a. Cells on the right will output the desired values. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. If the value of sheet metal k factor and bending flange length is known.

R is inner bend radius. You only have to insert interior angle flange lengths k factor inside radius and material thickness. Where ba is bend allowance. We know that ba is the length of the arc on the neutral axis.

Die edge radius in. Ba bend angle π 180 r k factor t eqn 1. The formula for calculating sheet metal bending allowance is please refer to the above picture.