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.

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

The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. Cells on the right will output the desired values. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. Sheet metal calculator bend allowance equations and calculator.

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. As this happens you gain a small amount of total length in your part. Ultimate tensile strength psi.

Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line. Punch edge radius in. Most sheet metal materials will conform to the calculations. Use this document to choose values that are both manufacturable and meet your needs.

A is the bending angle in the above equation so. You only have to insert interior angle flange lengths k factor inside radius and material thickness. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. To calculate r which is the radius of the arc on the neutral axis we can use the following equation.

This page also includes a link to a on line sheet metal bend allowance calculator. To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. 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 tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels. And by having t and the sheet thickness t we can calculate the k factor as follow.