Neutral Factor Sheet Metal

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.

Neutral factor sheet metal.

After bending the sheet insert the inner radius and flanges a and b. To calculate the bend allowance the k factor and the derived coefficient called the y factor insert the thickness and initial length of the sheet into the cells on the left. Flat blank dimensions are calculated by determining the path length along the neutral axis. The k factor in sheet metal working is the ratio of the neutral axis to the material thickness.

For example the following part that has a 90 o bend. The location of the neutral axis varies and is based on the material s physical properties and its thickness. The line where the transition from compression to stretching occurs is called the neutral axis. Bending angle is 90.

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. When you bend sheet metal the neutral axis shifts toward the inside surface of the bend. Our design engineers typically use a factor of 0 4 for our air formed press brake parts. This is defined as the length of the neutral fibre from the beginning to the end of the arc generated by the bend.

In this article we will discuss sheetmetal bend deduction bend allowance k factor y factor and sheet metal flat pattern calculations. The location of the neutral axis is specified with the k factor. When metal is bent the top section is going to undergo compression and the bottom section will be stretched. I had a question on k factors for our 3 d modeling software.

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. Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line. K factor in sheet metal bending is a constant used to calculate sheet metal flat length or flat pattern. The k factor is the ratio of the neutral axis location t to the material thickness mt.

It is the fraction of material thickness from the inside of the bend to the neutral axis. Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness.