sheet metal flatten
How is it calculated?
drawing is this true is this false
For jobs like this I would use the drawing itself printed 1:1 to check the bending. The flanges are easy of course and bumping the 100mm radius would give you a lot of room to play with, though bump bending is an art unto itself. I might have rolled this part myself on a 3-point roller then added the flanges in the press brake.
Having done 100's of these in the past I would use a K-Factor of .5 though I agree that it is likely that .44 would apply on the 5mm radius bends. That is easy to do in SW. Back in the day when I was rolling crash test dummy ribs out of 1/8" x 3/4" rolled edge steel alloy I would have used AutoCAD and just offset a line to 50% of the material thickness and converted that line to a polyline and just measured it. That was my flat.
Hi Arif, This is calculated using a bend tolerance. This is dependant on material, sheet thickness, and also the machine. For rads larger than the thickness of the sheet, try a k-factor of 0.5.
It is unlikely your lay-flat is currently giving you a correct length.
I'm thinking (like Bjorn) that your flat pattern length would be incorrect for the material you are using. According to my calculations, if you are using a k-factor, then it is .272 which is indeed unlikely. I wold change that to something like .44 to .5. The k-factor is a percentage of the material thickness. As you can see from my screenshot yours is ~.272 or 1.36/5..
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