Forging Definitions
Forging Definitions
(OP)
What is the difference between "bar stock", "forging stock" and "wrought bar"?
and do these definitions change whether the metal is rolled or extruded?
If forged stock is cut and turned down is it still considered forged stock?
and do these definitions change whether the metal is rolled or extruded?
If forged stock is cut and turned down is it still considered forged stock?





RE: Forging Definitions
Bar stock is a product form - round, square,,,,,. It can be manufactured by rolling, forging, extruding,,,,
Forging stock is a product form, could be plate, bar, etc.,,,, it is forged.
Wrought bar is a product form that has been formed by either rolling, extruding, forging,,,,,,
See above
Yes.
RE: Forging Definitions
If forging stock is turned down, ground, or milled, then is it still considered forging stock?
Is material considered round stock both before or after grinding, milling or machining if it is round round both before and after?
RE: Forging Definitions
Yep.
Yep.
RE: Forging Definitions
RE: Forging Definitions
A 29 - steel bars, Hot wrought and Cold Finished
RE: Forging Definitions
RE: Forging Definitions
RE: Forging Definitions
Where I'm going with that is that a forged item has been hit with a very big hammer at some point in its gestation. The virtue of forging is that any hidden flaws that are large enough to cause trouble in service will probably be revealed by the forging hammer, which is pretty much guaranteed to turn hidden flaws into visible flaws or outright fractures. Therefore the chance of a "forged" part failing in service is pretty small.
Whereas, steel that has been cast | rolled | hot finished | cold finished, may look perfectly fine, but there is still a finite chance that it contains hidden flaws.
I am guessing that "forging stock" is metal produced by any means and >intended to be forged at some time in the future<, which is probably annealed or alloyed in such a way as to make forging easier, but may still contain hidden flaws. Whereas "forged bar" or "forged bar stock" actually has been under the forging hammer, and is much less likely to contain hidden flaws.
Now that you're thoroughly confused, consult the specifications.
Mike Halloran
Pembroke Pines, FL, USA
RE: Forging Definitions
Forgings can have hidden flaws and imperfections as some of my past fire drills can attest. Rush heat exchanger delivery schedules wrecked due to forgings that couldn't pass UT due to hidden flaws so new forgings were 'hammered' out and the rest of the Hx just had to wait. Forgings are used for high pressure tubesheets and channels and nozzles.
My only other real up close experience with forgings were howitzer shells made by punch forging. That wasn't a hammer, but it could do more damage than any hammer I ever saw. In went a 6X6X18" red hot billett, down came the ram and out came a heavy wall cylinder that after several other operations including filling it with TNT ended up being fired out of a 155 mm gun. That thing would go through fingers with great ease. Sorry to say I saw that too.
rmw
RE: Forging Definitions
Part of my very early youth was spent in a town whose major employer was a forging company. All day long, every few seconds, one of their many hammers dropped. You could literally hear it and feel it, all over town.
I think the forge closed in 2004. It must be a very quiet little town now.
Mike Halloran
Pembroke Pines, FL, USA
RE: Forging Definitions
Once they lost a hydraulic power unit on one of the press lines and some young crackerjack engineer (not me) suggested that they just gang X number of barrel pumps together in parallel instead, and they did it and it worked until they got the press pumps fixed. Dangest thing you ever saw, dozens of barrels with air operated pumps all going chugh-plop chugh-plop at barrel pump pace. That was loud too. An interesting HR observation made was that a certain group of workers couldn't be assigned to work near the barrels because all they wanted to do was dance in time with the pump strokes. True story. They had to find workers that didn't have 'rhythm' for that area.
The forge where the tubesheets and pillboxes were made (the occasion of my visit was to examine a forging that had failed UT that was a pillbox) was all presses, and was relatively quiet by comparison.
rmw
RE: Forging Definitions
Mike Halloran
Pembroke Pines, FL, USA
RE: Forging Definitions
The pillbox and tubesheet forgings were just that; forgings but they had been machined on every surface at the forge. They had to do that just to be able to UT them. Upon receipt by the Hx Mfg'r they were further machined, drilled, overlayed, as they became part of the heart and soul of a Hx but they never lost their identity as A350 LF2 forged material.
rmw
RE: Forging Definitions
Regards,
Mike
RE: Forging Definitions
RE: Forging Definitions
RE: Forging Definitions
http://ajaxring.com/docs/glossary.pdf
RE: Forging Definitions
Did you find it odd that "burst" was not listed nad defined?
RE: Forging Definitions
I haven't found a list that sorta kinda breaks down hammers, like a gravity, gravity assisted, and various trip hammers. This omission of certain words is why I but the recommendation to look up terms not covered.
Addenda:
Back in my pup days the company I worked fro had a contest as to who could get the hammer closest to an egg on the anvil for a prize of $10.00 and a day off. By pure luck I beat out about twenty grizzled veterans with a distance of around 0.001 and 0.002". I was cock of the walk for a while. I never had to backup my feat as Uncle Sam sent me draft notice.