Sheet Metal Bending Calculation

The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal.

Sheet metal bending calculation.

The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. 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. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.

Therefore the bend allowance added to the flange lengths is equal to the total flat length. Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. You only have to insert interior angle flange lengths k factor inside radius and material thickness.

This page also includes a link to a on line sheet metal bend allowance calculator. Discover all our calculation tools in the calculators section of the top menu. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels.

Most sheet metal materials will conform to the calculations. Die edge radius in. 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 bend allowance calculator determines the bend allowance amount of metal to be added to the total layout when forming sheet metal.

From there we can calculate the k factor and the bend deduction. We will start by calculating the bend allowance. Most sheet metal materials will conform to the calculations. Ultimate tensile strength psi.

90 degrees bend angle. Material to the inside of this line ought to compress whereas the material on the outside of it should expand. Sheet metal calculator bend allowance equations and calculator. 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.

Cells on the right will output the desired values. The material thickness will be measured in decimal form not by the gauge number.