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.

Bending factor in sheet metal. 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. It s the base value needed to calculate bend allowances and ultimately the bend deduction. All other values are known to the user.

Mathematically bend allowance during sheet metal bending can be calculated as. A bending angle. There s quite a few different bending methods available. Calculate k factor bend allowance and y factor for sheet metal bending.

In above bend allowance formula except sheet metal k factor and bend allowance values. Mathematically this formula looks like this. When bending a workpiece it will naturally spring back a little after the load is lifted. Of all the mathematical constants used in precision sheet metal fabrication the k factor stands out as one of the most important.

Find the material thickness mt and you ll have the information you need for calculating the k factor for sheet metal bending. T sheet thickness. Sheet metal bending methods design tips k factor bending methods. It s a mathematical multiplier that allows you to locate the repositioned neutral axis of the bend after forming.

Each has their own advantages. The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e. Bend allowance ba π 180 r k t a. Space is left between the sheet and the bottom of the v opening.

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. The part of the material that bends without being compressed nor elongated. The bending radius must be at least 0 8 t to 2 t for sheet steel.