Neutral Factor Sheet Metal

Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness.

Neutral factor sheet metal. In this article we will discuss sheetmetal bend deduction bend allowance k factor y factor and sheet metal flat pattern calculations. When you bend sheet metal the neutral axis shifts toward the inside surface of the bend. The k factor in sheet metal working is the ratio of the neutral axis to the material thickness. 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.

Our design engineers typically use a factor of 0 4 for our air formed press brake parts. Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line. 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 metal is bent the top section is going to undergo compression and the bottom section will be stretched.

K factor in sheet metal bending is a constant used to calculate sheet metal flat length or flat pattern. Flat blank dimensions are calculated by determining the path length along the neutral axis. 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 k factor is a constant determined by dividing the material thickness of the sheet by the location of the neutral axis.

This is defined as the length of the neutral fibre from the beginning to the end of the arc generated by the bend. The line where the transition from compression to stretching occurs is called the neutral axis. Bending angle is 90. The neutral axis does not suffer any change of length during a bending operation.

The location of the neutral axis is specified with the k factor. The location of the neutral axis varies and is based on the material s physical properties and its thickness. It is the fraction of material thickness from the inside of the bend to the neutral axis. The k factor is the ratio of the neutral axis location t to the material thickness mt.

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. After bending the sheet insert the inner radius and flanges a and b.