Bending Factor In Sheet Metal

A bending angle.

Bending factor in sheet metal.

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. The optimum width of the v opening is 6 t t stands for material thickness for sheets about 3 mm thick up to about 12 t for 12 mm thick sheets. R inside bend radius. Calculate k factor bend allowance and y factor for sheet metal bending.

It s the base value needed to calculate bend allowances and ultimately the bend deduction. Of all the mathematical constants used in precision sheet metal fabrication the k factor stands out as one of the most important. Each has their own advantages. Sheet metal bending methods design tips k factor bending methods.

Finding y factor for sheet metal bending. K value of k factor. Find the material thickness mt and you ll have the information you need for calculating the k factor for sheet metal bending. Bend allowance ba π 180 r k t a.

The part of the material that bends without being compressed nor elongated. All other values are known to the user. There s quite a few different bending methods available. K factor 180 x ba π x complementary bend angle x mt ir mt 2.

To find the k factor divide the product of 180 and ba by the difference between the product of pi mt and the complementary bend angle to the ratio of ir to mt. Mathematically bend allowance during sheet metal bending can be calculated as. It s a mathematical multiplier that allows you to locate the repositioned neutral axis of the bend after forming. In above bend allowance formula except sheet metal k factor and bend allowance values.

The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e. When bending a workpiece it will naturally spring back a little after the load is lifted. Mathematically this formula looks like this.