Sheet Metal Bend Deduction

Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees.

Sheet metal 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. The bend radius refers to the inside radius. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal.

The bend allowance is the amount of the neutral axis that bends. The bend allowance ba is the arc length of the bend as measured along the neutral axis of the material. 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. If you compare the length of this part before and after the bending you re going to find that they re different.

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. Sheet metal calculator bend allowance equations and calculator. Therefore the bend allowance added to the flange lengths is equal to the total flat.

In the example above it is indicated by a dashed blue line. We will start by calculating the bend allowance. In the example above it is indicated by a dashed blue line. You only have to insert interior angle flange lengths k factor inside radius and material thickness.

The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. 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. 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.

The formed bend radius is dependent upon the dies used the material properties and the material thickness. 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 allowance and consequently the bend deduction of a part is a crucial first step to understanding how sheet metal parts are fabricated. 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.

When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend.