Then input the bend angle to get the arc length bend allowance and bend deduction.
Calculate radius sheet metal.
Here again a minimum bend radius is not necessarily the same thing as a sharp bend.
To calculate r which is the radius of the arc on the neutral axis we can use the following equation.
Best way to calculate k factor in sheet metal is by reverse engineering.
Choose a bend radius that matches your minimum bend.
This page also includes a link to a on line sheet metal bend allowance calculator.
Determine your minimum bend by measuring the distance from your closest feature i e.
This calculator predicts what the minimum bend radius should be to avoid chacking or orange peeling on the outside radius of the bend.
A cutout or the edge of your flange to your bend.
Sheet metal calculator bend allowance equations and calculator.
Bend radii minimum bend sizes.
A sharp bend will always be less than a minimum bend radius but a minimum bend radius does not need to be sharp.
Whereas the outer surface is stretched.
Die edge radius in.
Punch edge radius in.
Input material thickness and and inner radius to get the data of k factor y factor neutral layer.
This change in sheet length depends on the position of neutral axis or k factor.
You only have to insert interior angle flange lengths k factor inside radius and material thickness.
A is the bending angle in the above equation so.
Then input leg length a and b to get the flat size of the sheet.
As a result overall sheet length increases.
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.
To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.
The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal.
Ultimate tensile strength psi.
And by having t and the sheet thickness t we can calculate the k factor as follow.