This page also includes a link to a on line sheet metal bend allowance calculator.
Sheet metal bend deduction.
In the example above it is indicated by a dashed blue line.
Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees.
Most sheet metal materials will conform to the calculations.
You only have to insert interior angle flange lengths k factor inside radius and material thickness.
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.
When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.
From there we can calculate the k factor and the bend deduction.
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.
Sheet metal calculator bend allowance equations and calculator.
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.
After bending the sheet we need to do some measurements as shown in figure 2.
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.
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.
The bend allowance ba is the arc length of the bend as measured along the neutral axis of the material.
The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.
You may be wondering what exactly is bend allowance if you ve never worked with sheet metal before.
When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.
In the example above it is indicated by a dashed blue line.
Therefore the bend allowance added to the flange lengths is equal to the total flat.
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.
We will start by calculating the bend allowance.
If you compare the length of this part before and after the bending you re going to find that they re different.
The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal.
The bend radius refers to the inside radius.
The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.
The formed bend radius is dependent upon the dies used the material properties and the material thickness.
