Calculation Of Bend Radius In Sheet Metal

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.

Calculation of bend radius in sheet metal.

It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. Sheet metal calculator bend allowance equations and calculator. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. 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. 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. Material to the inside of this line ought to compress whereas the material on the outside of it should expand. To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.

This page also includes a link to a on line sheet metal bend allowance calculator. You only have to insert interior angle flange lengths k factor inside radius and material thickness. Use this document to choose values that are both manufacturable and meet your needs. Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line.

Punch edge radius in. And by having t and the sheet thickness t we can calculate the k factor as follow. Bend radii minimum bend sizes. 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. Therefore the bend allowance added to the flange lengths is equal to the total flat. To calculate r which is the radius of the arc on the neutral axis we can use the following equation. As this happens you gain a small amount of total length in your part.

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

When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels.