Sheet Metal K Factor Formula

Input material thickness and and inner radius to get the data of k factor y factor neutral layer.

Sheet metal k factor formula.

Calculate k factor bend allowance and y factor for sheet metal bending. This change in sheet length depends on the position of neutral axis or k factor. Best way to calculate k factor in sheet metal is by reverse engineering. I had a question on k factors for our 3 d modeling software.

4 1 893 2 214. The part of the material that bends. K factor k the ratio of the position of the neutral axis to the material thickness. The k factor formulation does not take the forming stresses into account but is simply a geometric calculation of the location of the neutral line after the forces are applied and is thus the roll up of all the unknown error factors for a given setup.

Then input the bend angle to get the arc length bend allowance and bend deduction. K factor is a ratio of location of the neutral line to the material thickness as defined by t t where t location of the neutral line and t material thickness. Cad tools use k factor to calculate sheet metal blank. When you bend sheet metal the neutral axis shifts toward the inside surface of the bend.

Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness. Inside radius ir the final formed inside radius after spring back has occurred. The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e. 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.

Plug the bend allowance ba the bend angle b inside radius ir and material thickness mt into the below equation to determine the k factor k. K factor in sheet metal bending is a constant used to calculate sheet metal flat length or flat pattern. Our design engineers typically use a factor of 0 4 for our air formed press brake parts. For our example it comes to.

K factor a constant determined by dividing the thickness of the sheet by the location of the neutral axis which is the part of sheet metal that does not change length. Subtract twice the leg length from the initial length to determine the bend allowance. Then input leg length a and b to get the flat size of the sheet. The k factor is the ratio of the neutral axis location t to the material thickness mt.

In this article we will discuss sheetmetal bend deduction bend allowance k factor y factor and sheet metal flat pattern calculations.