Sheet Metal K Factor Formula

Best way to calculate k factor in sheet metal is by reverse engineering.

Sheet metal k factor formula.

Cad tools use k factor to calculate sheet metal blank. 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. As a result overall sheet length increases. 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.

Subtract twice the leg length from the initial length to determine the bend allowance. In this article we will discuss sheetmetal bend deduction bend allowance k factor y factor and sheet metal flat pattern calculations. You can use this k factor calculator to calculate k factor using reverse engineering method. Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness.

The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e. For our example it comes to. The part of the material that bends. 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. 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.