Sheet Metal Bending Calculation

The white dashed line on the part shown above represents the neutral axis which is the theoretical point in the material that does not change during the course of forming.

Sheet metal bending calculation.

The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. Material to the inside of this line ought to compress whereas the material on the outside of it should expand. The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.

Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. The material thickness will be measured in decimal form not by the gauge number. This page also includes a link to a on line sheet metal bend allowance calculator. Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line.

The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. 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. We will start by calculating the bend allowance.

Sheet metal bend allowance calculator determines the bend allowance amount of metal to be added to the total layout when forming sheet metal. Therefore the bend allowance added to the flange lengths is equal to the total flat length. Most sheet metal materials will conform to the calculations. In sheet metal design the k factor is used to calculate how much sheet metal one needs to leave for the bend in order to achieve particular final dimensions especially for between the straight sides next the bend.

Punch edge radius in. Ultimate tensile strength psi. 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.

Die edge radius in. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. 90 degrees bend angle. Cells on the right will output the desired values.

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. Discover all our calculation tools in the calculators section of the top menu.