Calculating K Factor Sheet Metal Bending

In order to find the k factor you will need to bend a sample piece and deduce the bend allowance.

Calculating k factor sheet metal bending.

As a result overall sheet length increases. The part of the material that bends. The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e. The inside radii are based off of a standard air bend force chart.

Once you know the k factor you can use it to predict the bend allowance for various angles. Therefore using k factor there is no need to calculate sheet metal flat length manually. Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape. The k factor is the most important and elusive variable of bending because it varies both as a function of the material and according to parameters such as angle and tooling.

For example if the value of k factor for given material thickness and bending machines is known. What is the k factor. Calculate k factor bend allowance and y factor for sheet metal bending. The below microsoft excel chart is for even numbered gauges 8 through 24 and has a default k factor of 33 for each.

And if you know the bend allowance you can extract the k factor from it. Then input leg length a and b to get the flat size of the sheet. Sheet metal bend allowance chart pdf. Since the k factor is based on the property of the metal and its thickness there is no simple way to calculate it ahead of the first bend.

The k factor is nothing more than a multiplier that can give you an accurate value for the relocated neutral axis. Then input the bend angle to get the arc length bend allowance and bend deduction. When sheet metal is bend the inside bending surface is compressed. From there we can calculate the k factor and the bend deduction.

Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. Sheet metal bending methods design tips k factor bending is one of the most common sheet metal fabrication operations. After bending the sheet we need to do some measurements as shown in figure 2. Typically the k factor is going to be between 0 and 5.

This change in sheet length depends on the position of neutral axis or k factor. As shown in figure 1 below k t t. Input material thickness and and inner radius to get the data of k factor y factor neutral layer. The k factor is fundamental to designing precise sheet metal.

Whereas the outer surface is stretched. The k factor is the ratio between the distance from the neutral layer to the bent inner surface and the thickness of the sheet metal. K factor in sheet metal bending is a constant that is used to calculate sheet metal flat length. We will start by calculating the bend allowance.

You can easily modify the material thickness inside radius and k factor for each thickness at the top of each column.