Sheet Metal K Factor Formula
Calculate k factor bend allowance and y factor for sheet metal bending.
Sheet metal k factor formula. K factor in sheet metal bending is a constant used to calculate sheet metal flat length or flat pattern. The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e. Best way to calculate k factor in sheet metal is by reverse engineering. This change in sheet length depends on the position of neutral axis or k factor.
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. 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. For our example it comes to.
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. 4 1 893 2 214. 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.
Cad tools use k factor to calculate sheet metal blank. 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.