To calculate r which is the radius of the arc on the neutral axis we can use the following equation.
Sheet metal bend radius calculator.
Most sheet metal materials will conform to the calculations.
Sheet metal calculator bend allowance equations and calculator.
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The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels.
Discover all our calculation tools in the calculators section of the top menu.
Therefore the bend allowance added to the flange lengths is equal to the total flat.
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.
It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.
And by having t and the sheet thickness t we can calculate the k factor as follow.
Automatically calculate bend deduction bend allowance and k factor for sheet metal fabrication and forming.
To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.
Bend radii minimum bend sizes.
The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.
Understanding the bend allowance and consequently the bend deduction of a part is a crucial first step to understanding how sheet metal parts are fabricated.
The bend deduction sometimes called the bend compensation describes how much the outside of the sheet has been stretched.
Die edge radius in.
Therefore the bend deduction equals the difference between the mold line lengths and the total flat length.
This tool allows you to determine tonnage internal radius v die opening and minimum flange you just have to insert the characteristics of the sheet metal to be bent.
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Online bend deduction calculator.
Bend formula example.
Punch edge radius in.
Use this document to choose values that are both manufacturable and meet your needs.
Ultimate tensile strength psi.
The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal.
The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.
This page also includes a link to a on line sheet metal bend allowance calculator.
You only have to insert interior angle flange lengths k factor inside radius and material thickness.
When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.
The bend allowance added to the flange lengths is equal to the total flat length of the part.
As this happens you gain a small amount of total length in your part.
