In the example above it is indicated by a dashed blue line.
Sheet metal bend deduction.
When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.
The bend radius refers to the inside radius.
The bend allowance is the amount of the neutral axis that bends.
In the example above it is indicated by a dashed blue line.
Most sheet metal materials will conform to the calculations.
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.
Well when a sheet is bent in the press brake the part of the sheet close to and in contact with the punch elongate to compensate for the given 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 is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend.
Although it is an option for calculating a bend in some cad programs such as solid works it is not often referred to in the actual manufacturing process since.
Understanding the bend deduction and consequently the bend allowance of a part is a crucial first step to understanding how sheet metal parts are fabricated.
Sheet metal calculator bend allowance equations and calculator.
You only have to insert interior angle flange lengths k factor inside radius and material thickness.
From there we can calculate the k factor and the bend deduction.
Therefore the bend allowance added to the flange lengths is equal to the total flat.
The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.
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.
After bending the sheet we need to do some measurements as shown in figure 2.
You may be wondering what exactly is bend allowance if you ve never worked with sheet metal before.
The formed bend radius is dependent upon the dies used the material properties and the material thickness.
The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal.
If you compare the length of this part before and after the bending you re going to find that they re different.
When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.
We will start by calculating the bend allowance.
This page also includes a link to a on line sheet metal bend allowance calculator.
Cells on the right will output the desired values.
