Forging work ratio
Forging work ratio
(OP)
Hi All!
We have a customer who specifies a minimum 4:1 work ratio on the parts forged for them. We need to certify the same. We buy pre-forged rounds and squares with a 2:1 work ratio already done on them. The problem we have now; Is the work done on the stock additive or multiplicative?? We are a divided house on this. Appreciate all or any help............Ciao.
We have a customer who specifies a minimum 4:1 work ratio on the parts forged for them. We need to certify the same. We buy pre-forged rounds and squares with a 2:1 work ratio already done on them. The problem we have now; Is the work done on the stock additive or multiplicative?? We are a divided house on this. Appreciate all or any help............Ciao.





RE: Forging work ratio
In our shop we specify a minimum 5:1 reduction for components that will be significantly hot worked in their entirety; 10:1 if not, but there are always exceptions (ex. knuckles, yokes are similar to your material).
You did not mention what size stock you are working with, but consider that rolled billets are typically around 6", blooms range from 12-14", and ingots much larger.
If what you are receiving specifies the casting method, you may have to go to a larger bloom or ingot, or demonstrate through destructive sectioning that your existing material has the soundness for the application after the additional forging operations.
RE: Forging work ratio
Appreciate the help.
Our bloom for the part in question is a 24" dia. preforged round (with a work ratio of 2.2 already in it). on finish the size will be 11.5" that gives a work ratio of about 2.087(say 2.1).
With a 2.2 work already put on the billet, will the 2.1 work ratio add to 2.2 to give 4.3 or will the 2.1 work ratio multiply with 2.2 to give 4.62? Thats the debate here.
Thanks in advance.............cheers
RE: Forging work ratio
I would use the original ingot CSA divided by the final work CSA to calculate the reduction. Incidentally I think I reversed the terms in my first post.
Just the work that you are doing in your shop is a 4.4:1 reduction. This value is what multiplies with the original reduction to give you a new value of 9.5:1.
I believe you should be fine.
RE: Forging work ratio
Regards,
Cory
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