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.

The formula for calculating sheet metal bending allowance is please refer to the above picture. If the value of sheet metal k factor and bending flange length is known. Punch edge radius in. Ba bend angle π 180 r k factor t eqn 1.

By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows. We can calculate the leg length 1 and 2 as follows. Therefore the bend allowance added to the flange lengths is equal to the total flat length. Where ba is bend allowance.

Sheet metal flat length can be calculated in the following three simple steps. In this formula the initial length is 300 mm. 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.

At the neutral axis we have. Die edge radius in. We know that ba is the length of the arc on the neutral axis. Ultimate tensile strength psi.

Cells on the right will output the desired values. R is inner bend radius. Bend angle represents the angle to which sheet metal has bend here it is 90 degree.