K Factor Sheet Metal Bending Table

The below microsoft excel chart is for even numbered gauges 8 through 24 and has a default k factor of 33 for each.

K factor sheet metal bending table.

Sheet metal bend allowance chart pdf. When metal is bent the top section is going to undergo compression and the bottom section will be stretched. You can easily modify the material thickness inside radius and k factor for each thickness at the top of each column. K factor 180 ba π bend angle complementary mt ir mt of course it s easiest to use a known k factor from a table like in figure 2.

Therefore using k factor there is no need to calculate sheet metal flat length manually. The inside radii are based off of a standard air bend force chart. The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e. The bend allowance bend deduction of the sheet metal specified in k factor by configuring and utilizing a sheet metal gauge table we can speed up the process of selecting the correct wall thickness based on gauge value and selecting the correct bend radius based on available tooling we can also automate the process of selecting the appropriate k factor.

The location of the neutral axis varies and is based on the material s physical properties and its thickness. The line where the transition from compression to stretching occurs is called the neutral axis. 90 degrees bend angle. This is done through the application of force on a workpiece.

With those data points along with the material thickness mt you can solve for the k factor all dimensions are in inches. Sheet metal bending methods design tips k factor bending is one of the most common sheet metal fabrication operations. Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line. By default inventor uses a k factor for calculating bend allowances.

The arc length of the neutral line is the length of the sheet metal you have to leave for the bend. The part of the material that bends without being compressed nor elongated. The k factor in sheet metal working is the ratio of the neutral axis to the material thickness. For example if the value of k factor for given material thickness and bending machines is known.

Sheet metal flat length can be calculated using cad softwares. The default k factor is 0 44 which simply means that inventor is assuming that 44 through the cross section of the part the material is not stretched or squashed when bending and therefore this slice of the folded part will give the true length of the flat pattern. The following table is a rule of thumb. After bending the sheet we need to do some measurements as shown in figure 2.

Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape. The following equation relates the k factor to the bend allowance. 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. We will start by calculating the bend allowance.

Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. From there we can calculate the k factor and the bend deduction. Calculate k factor bend allowance and y factor for sheet metal bending.