Sheet Metal Bend Deduction Formula

The formed bend radius is dependent upon the dies used the material properties and the material thickness.

Sheet metal bend deduction formula.

When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. This page also includes a link to a on line sheet metal bend allowance calculator. 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. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.

As with bend allowance bend deduction comes from the same sources tables and manual testing. Another method that solidworks uses is the bend deduction method. 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. From there we can calculate the k factor and the bend deduction.

You only have to insert interior angle flange lengths k factor inside radius and material thickness. The formula is as follows. Sheet metal calculator bend allowance equations and calculator. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend.

The flatten length of the parts that are lf equals d1 plus d2 minus the bend deduction. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. Lf d1 d2 bd.

Therefore the bend allowance added to the flange lengths is equal to the total flat. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. Bd bend deduction. The bend radius refers to the inside radius.

Cells on the right will output the desired values. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. Most sheet metal materials will conform to the calculations.