FORGING RATIO - FLANGES

[eg0u4106]

Hi All,
I'm quite familiar with calculating forging ratios, but how is this performed for wn flanges (i.e. items with effectively 2 cross-sectional areas?)

I'm forging a 320mm diameter x 380mm height bar into a flange of body diameter 500mm x 114mm height and neck diameter 265mm x 136mm height.
Would it simply be the original height divisable by the final height? 380/(114+136) = 1.52:1?

Thanks in advance.

 

[metengr]

No, it is not based just on the change in height from forging. Please review the post below;
thread330-237898


and here;

http://books.google.com/books?id=N1...q=calculating forging reduction ratio&f=false

Hint - look at the maximum final cross sectional area of the forging.

 

[eg0u4106]

Hi,
Cheers!

What I'm getting at is the ratio between heights would oridinarily be the same as the ratio between the cross-section in a uniform cylinder.
In a flange this is not the case, but from what I think you're saying/the links say...

I simply calculate, if upsetting, max cross-section of final divided by initial cross-section?
Regardless of the shape?

Thanks.

 

[metengr]

Yes.