#11
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True radius dies
I know this is an old thread, but it seemed like the best place for this. I have about 10 hours on a wheeling machine and want to pick up skill as fast as I can. Lots of thinking about what is going on at the molecular level. So, I did some Finite element work to look at stress. The graphic was an insight to me about the difference between true radius and Contact flat anvils. The peak stress is much higher, in the center, on the true radius (elliptical depression.) I can see now how the blending is tougher with full radius.
ewheel.JPG
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Bill Funk |
#12
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Bill your FE model doesn't show all the forces that are typically used with full radius anvils. Different techniques are used with anvils having flats compared to the techniques that work well with full radius anvils. That difference is that much lower crushing pressure is used with full radius anvils. Forming is accomplished by subjecting the panel to a rolling 3 point bend over the anvil. This technique is more intuitive (to me) than concentrating on tracking patterns. It's more about actually forming the panel over the lower die.
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Bob Don't believe everything you think. |
#13
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Quote:
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Richard K |
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