The location of the neutral axis varies and is based on the material s physical properties and its thickness.
Neutral line in sheet metal.
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If the material did not stretch at all then the neutral line would be at 50 of the material.
To calculate r which is the radius of the arc on the neutral axis we can use the following equation.
The neutral line is an imaginary line that passes somewhere close to the middle of the material.
22 gauge metal sheet model 801447 8 98 8 98.
Neutral axis an imaginary line that has the same length after bending as it had before bending.
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.
And by having t and the sheet thickness t we can calculate the k factor as follow.
Our design engineers typically use a factor of 0 4 for our air formed press brake parts.
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It is the area where the material neither stretches nor compresses in the bend.
The line where the transition from compression to stretching occurs is called the neutral axis.
Notice how the sheet has thinned at the bend.
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.
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When metal is bent the top section is going to undergo compression and the bottom section will be stretched.
Figure 2 after bending the bend area is 10 to 15 percent thinner than before bending.
Its location in the material is a function of the forces used to form the part and the material yield and tensile strengths.
To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.
The neutral axis position depends on the bend angle inside bend radius and method of forming.
This thinning of the bend area moves the neutral line of the metal in towards the radius center.
It varies according to material its thickness bend radius and bending method.
A is the bending angle in the above equation so.
The neutral axis is the zone or plane that separates the tension from the compression.
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.
The k factor is the ratio of the neutral axis location t to the material thickness mt.
Look closely a figure 1.
I had a question on k factors for our 3 d modeling software.
By using it you get the bend allowance which is in essence the length of the curved neutral axis.
