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. Die edge radius in. If the value of sheet metal k factor and bending flange length is known. We know that ba is the length of the arc on the neutral axis. Punch edge radius in.

Ultimate tensile strength psi. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. Calculate the value bend allowance for required sheet metal bend by using below formula. The formula for calculating sheet metal bending allowance is please refer to the above picture.

Bend angle represents the angle to which sheet metal has bend here it is 90 degree. R is inner bend radius. At the neutral axis we have. We can calculate the leg length 1 and 2 as follows.

In this formula the initial length is 300 mm. By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows. 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.

Bend allowance ba π 180 r k t a. You only have to insert interior angle flange lengths k factor inside radius and material thickness. Sheet metal flat length can be calculated in the following three simple steps.