Calculating Developed Length For Sheet Metal Bends

Ba bend angle π 180 r k factor t eqn 1.

Calculating developed length for sheet metal bends.

Punch edge radius in. 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. R is inner bend radius.

By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows. We know that ba is the length of the arc on the neutral axis. Therefore the bend allowance added to the flange lengths is equal to the total flat length. In this formula the initial length is 300 mm.

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. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. Where ba is bend allowance.

If the value of sheet metal k factor and bending flange length is known. Bend allowance ba π 180 r k t a. 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.

At the neutral axis we have. Ultimate tensile strength psi. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.