Bending Factor In Sheet Metal

Mathematically bend allowance during sheet metal bending can be calculated as.

Bending factor in sheet metal.

In above bend allowance formula except sheet metal k factor and bend allowance values. 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. A bending angle. Find the material thickness mt and you ll have the information you need for calculating the k factor for sheet metal bending.

The bending radius must be at least 0 8 t to 2 t for sheet steel. R inside bend radius. It s a mathematical multiplier that allows you to locate the repositioned neutral axis of the bend after forming. Space is left between the sheet and the bottom of the v opening.

The part of the material that bends without being compressed nor elongated. K value of k factor. K factor 180 x ba π x complementary bend angle x mt ir mt 2. 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. It s the base value needed to calculate bend allowances and ultimately the bend deduction. 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.

Of all the mathematical constants used in precision sheet metal fabrication the k factor stands out as one of the most important. Sheet metal bending methods design tips k factor bending methods. Each has their own advantages. Mathematically this formula looks like this.

When bending a workpiece it will naturally spring back a little after the load is lifted. T sheet thickness. Finding y factor for sheet metal bending.