K Factor For Aluminum Sheet Metal

K factor 180 x ba π x complementary bend angle x mt ir mt 2.

K factor for aluminum sheet metal.

The k factor in sheet metal working is the ratio of the neutral axis to the material thickness. 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. Precision sheet metal fabrication request a quote. 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.

The below microsoft excel chart is for even numbered gauges 8 through 24 and has a default k factor of 33 for each. The k factor in this case kfactor expresses that distance as a percentage of the material s thickness. Calculate k factor bend allowance and y factor for sheet metal bending. In sheet metal design the k factor is used to calculate how much sheet metal one needs to leave for the bend in order to achieve particular final dimensions especially for between the straight sides next the bend.

The k factor is usually somewhere between 0 3 and 0 5. 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. Of all the mathematical constants used in precision sheet metal fabrication the k factor stands out as one of the most important. Sheet metal bend allowance chart pdf.

Ultimate tensile strength psi. It s the base value needed to calculate bend allowances and ultimately the bend deduction. Finding y factor for sheet metal bending. When metal is bent the top section is going to undergo compression and the bottom section will be stretched.

The line where the transition from compression to stretching occurs is called the neutral axis. So if the thickness of the sheet was a distance of t 1 mm and the location of the neutral axis was a distance of t 0 5 mm measured from the inside bend then you would have a k factor of t t 0 5 1 0 5. Find the material thickness mt and you ll have the information you need for calculating the k factor for sheet metal bending. The part of the material that bends.

The location of the neutral axis varies and is based on the material s physical properties and its thickness. The k factor depends on many factors including the material the type of bending operation coining bottoming air bending etc the tools etc. Because of the specific properties of any given metal there is no easy way to calculate that value perfectly hence the chart in figure 2. The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e.

The inside radii are based off of a standard air bend force chart. Punch edge radius in. You can easily modify the material thickness inside radius and k factor for each thickness at the top of each column. Mathematically this formula looks like this.

The k factor is defined mathematically as t mt where t is the neutral axis location and mt is the material thickness. It s a mathematical multiplier that allows you to locate the repositioned neutral axis of the bend after forming. Die edge radius in.