Calculating Bend Radius Sheet Metal

Material to the inside of this line ought to compress whereas the material on the outside of it should expand.

Calculating bend radius sheet metal.

The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. Cells on the right will output the desired values. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.

Therefore the bend allowance added to the flange lengths is equal to the total flat. Die edge radius in. When bends are made smaller than the required min. Outside setback ossb tangent degree of bend angle 2 inside bend radius material thickness bend deduction bd outside setback 2 bend allowance there are two ways to calculate the flat blank.

And by having t and the sheet thickness t we can calculate the k factor as follow. 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. Radius metal will crack at the outside heel of the bend. Like previous scenarios let s start by calculating leg length 1.

When we calculate the bend allowance we find that it equals 457. To calculate r which is the radius of the arc on the neutral axis we can use the following equation. A is the bending angle in the above equation so. 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.

Bend radii minimum bend sizes. The resulting inside bend radius on the part will remain at 63 percent of material thickness. Radius of a bend is determined by the hardness and thickness of the metal. Below is our simple bend allowance calculator it works by inputing the material thickness bend angle inside radius and k factor.

You only have to insert interior angle flange lengths k factor inside radius and material thickness. Sheet metal calculator bend allowance equations and calculator. Bending angles greater than 90 degrees. Most sheet metal materials will conform to the calculations.

Bend allowance is the amount of metal to be added to the total layout. As you can see the bend allowance and bend deduction are closely related below. Determine your minimum bend by measuring the distance from your closest feature i e. It simply processes these variables through the equations we will discuss below.

Choose a bend radius that matches your minimum bend. Ultimate tensile strength psi. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. Punch edge radius in.

In order to develop the flat pattern we add 457 to 1 625 and 2 625 to arrive at 4 707.