K Factor Sheet Metal Aluminium

Find the material thickness mt and you ll have the information you need for calculating the k factor for sheet metal bending.

K factor sheet metal aluminium.

The k factor is usually somewhere between 0 3 and 0 5. Calculate k factor bend allowance and y factor for sheet metal bending. 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. Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line.

Definition of the k factor. The line where the transition from compression to stretching occurs is called the neutral axis. In this article we will discuss sheetmetal bend deduction bend allowance k factor y factor and sheet metal flat pattern calculations. The k factor is the ratio of the neutral layer position thickness t of the sheet metal to the overall thickness of the sheet metal material t i e.

In my previous post i talked about k factor bend allowance and bend deduction and what they mean in sheet metal design. Neutral axis cannot go beyond the middle of the sheet thickness. K factor 180 x ba π x complementary bend angle x mt ir mt 2. The k factor is defined as the ratio between the material thickness t and the neutral fibre axis t i e.

As i mentioned in my last post you need to do some tests to calculate these values for a specific sheet. Semi hard copper or brass mild steel aluminium etc. Finding y factor for sheet metal bending. 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.

Now let s see how we can obtain these values for a specific sheet. K t t. K factor value is inversely proportional to sheet thickness. Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness.

Therefore k factor value can not exceed 0 5. The location of the neutral axis varies and is based on the material s physical properties and its thickness. Bronze hard bronze cold rolled steel spring steel etc. 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 in sheet metal working is the ratio of the neutral axis to the material thickness. Increase in thickness decreases k factor value. K factor in sheet metal bending is a constant used to calculate sheet metal flat length or flat pattern. The k factor is defined mathematically as t mt where t is the neutral axis location and mt is the material thickness.

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. Mathematically this formula looks like this. The part of the material that bends.