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  #11  
Old 01-05-2018, 01:28 PM
billfunk29 billfunk29 is offline
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Default 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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Old 01-05-2018, 02:15 PM
bobadame bobadame is online now
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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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  #13  
Old 01-05-2018, 04:19 PM
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Richard K Richard K is offline
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Quote:
Originally Posted by billfunk29 View Post
....... Lots of thinking about what is going on at the molecular level. ......
Attachment 44744
No need to think about molecules Bill. Metals are a crystalline structure; slip planes and such become important. Look at a Basic Metallurgy book or search the internet. I know you like to understand details, you might find a new challenge.
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