To calculate r which is the radius of the arc on the neutral axis we can use the following equation.
Neutral line in sheet metal.
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.
Its location in the material is a function of the forces used to form the part and the material yield and tensile strengths.
It is the area where the material neither stretches nor compresses in the bend.
And by having t and the sheet thickness t we can calculate the k factor as follow.
Notice how the sheet has thinned at the bend.
To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.
The neutral line is an imaginary line that passes somewhere close to the middle of the material.
It varies according to material its thickness bend radius and bending method.
By using it you get the bend allowance which is in essence the length of the curved neutral axis.
Our design engineers typically use a factor of 0 4 for our air formed press brake parts.
Basically the k factor offsets the neutral line to provide a flat pattern that reflects reality.
The neutral axis position depends on the bend angle inside bend radius and method of forming.
I had a question on k factors for our 3 d modeling software.
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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.
If the material did not stretch at all then the neutral line would be at 50 of the material.
The line where the transition from compression to stretching occurs is called the neutral axis.
The neutral axis is the zone or plane that separates the tension from the compression.
Look closely a figure 1.
A is the bending angle in the above equation so.
Satin nick elliptical aluminum sheet model 57010 18 98 18 98.
The k factor in sheet metal working is the ratio of the neutral axis to the material thickness.
This thinning of the bend area moves the neutral line of the metal in towards the radius center.
When you bend sheet metal the neutral axis shifts toward the inside surface of the bend.
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When metal is bent the top section is going to undergo compression and the bottom section will be stretched.
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Neutral axis an imaginary line that has the same length after bending as it had before bending.
The location of the neutral axis varies and is based on the material s physical properties and its thickness.
