The location of the neutral axis varies and is based on the material s physical properties and its thickness.
Neutral line in sheet metal.
A is the bending angle in the above equation so.
Our design engineers typically use a factor of 0 4 for our air formed press brake parts.
The neutral axis position depends on the bend angle inside bend radius and method of forming.
Notice how the sheet has thinned at the bend.
If the material did not stretch at all then the neutral line would be at 50 of the material.
It is the area where the material neither stretches nor compresses in the bend.
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The line where the transition from compression to stretching occurs is called the neutral axis.
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The k factor is the ratio of the neutral axis location t to the material thickness mt.
To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.
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I had a question on k factors for our 3 d modeling software.
Look closely a figure 1.
This thinning of the bend area moves the neutral line of the metal in towards the radius center.
The neutral axis s behavior is the main reason the flat part needs to be smaller than the total of the formed piece s outside dimensions.
Neutral axis an imaginary line that has the same length after bending as it had before bending.
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By using it you get the bend allowance which is in essence the length of the curved neutral axis.
The neutral line is an imaginary line that passes somewhere close to the middle of the material.
The neutral line also called the neutral axis is an imaginary line that can be drawn through a cross section of the workpiece that represents the locus where no tensile nor compressive stresses are present on the work.
And by having t and the sheet thickness t we can calculate the k factor as follow.
It varies according to material its thickness bend radius and bending method.
Figure 2 after bending the bend area is 10 to 15 percent thinner than before bending.
When metal is bent the top section is going to undergo compression and the bottom section will be stretched.
Basically the k factor offsets the neutral line to provide a flat pattern that reflects reality.
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The k factor in sheet metal working is the ratio of the neutral axis to the material thickness.
To calculate r which is the radius of the arc on the neutral axis we can use the following equation.
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