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Cut rifling vs button rifling

 
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  #36  
Old 09-28-2007, 06:39 PM
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Now why would someone want to close this, i asked the question because i wanted to learn and i am getting some valuable information and opinions so why close it ? (bounty hunter)
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  #37  
Old 09-30-2007, 03:29 PM
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Quote:
Originally Posted by locotrician View Post
Now why would someone want to close this, i asked the question because i wanted to learn and i am getting some valuable information and opinions so why close it ? (bounty hunter)
I agree, this is a very informative thread!

Question. How is stress taken out of the barrel?
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  #38  
Old 09-30-2007, 05:32 PM
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Rogue

The barrel is heated to a predetermined temperature based on the material
and held for a predetermined time and then cooled down slowly in a furnace.

I heard the term Stress relieve used more than once on this thread
and I think this needs to be cleared up!!

A barrel that has been stress relieved still has some stresses because
if you go high enough to remove all of the stress it would ruin the barrel
because the temperature would be above yield for the material (1800 to
2400 degrees) and thats what is called an anneal.

All that a stress relieve does is reduce the stress to a reasonable level
and make the material more stable

I'm sure we have a metallurgist on this web site that could explain it
much better.

Maybe Specweldtom will chime in and help ?

J E CUSTOM
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Last edited by J E Custom; 09-30-2007 at 05:40 PM.
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  #39  
Old 09-30-2007, 06:19 PM
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Join Date: Oct 2006
Location: Colorado
Posts: 47
Quote:
Originally Posted by J E Custom View Post
Rogue

The barrel is heated to a predetermined temperature based on the material
and held for a predetermined time and then cooled down slowly in a furnace.

I heard the term Stress relieve used more than once on this thread
and I think this needs to be cleared up!!

A barrel that has been stress relieved still has some stresses because
if you go high enough to remove all of the stress it would ruin the barrel
because the temperature would be above yield for the material (1800 to
2400 degrees) and thats what is called an anneal.

All that a stress relieve does is reduce the stress to a reasonable level
and make the material more stable

I'm sure we have a metallurgist on this web site that could explain it
much better.

Maybe Specweldtom will chime in and help ?

J E CUSTOM
I am not a Gun Smith nor any kind of expert. I am just trying to learn and understand.

If a barrel has stress, does this not mean that it has tension within the metal? When the tension is relived, will the metal not then move?
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  #40  
Old 10-01-2007, 08:50 AM
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Go to Lilja's FAQ page Dan talks about it and while your there look at fluting he talks about stress relief there too!
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  #41  
Old 10-01-2007, 01:52 PM
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Location: Texas
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You have to take "stress relief" literally. It doesn't mean "stress elimination". Thermal stress relief describes a sub-critical process (below the temperature that would cause internal granular changes) which removes some of the stresses trapped in the material that were caused by forging, rolling, welding,or other working, by heating it to a point where slip planes can occur in the structure of the material and allow relaxation of peak locked-in stresses first and more slowly and less effectively for lower stresses. It won't eliminate all stresses. I don't know much about the cryogenic treatments or their effect on stresses, if any. Also, there is a type of mechanical (vibratory) stress relief that I haven't seen to be effective.

Worth noting: if a material has been stressed past it's elastic limit, (beyond its yield strength), stress relief can not return it to its original shape. Example: a barrel bent by a mishap won't straighten by stress relief, or a button rifled barrel will not return to its original un-rifled state by stress relieving it. Thank goodness!

Bottom line finally; after stress relieving a barrel, some stresses remain trapped, and the material can and probably will creep and crawl measurably if enough material is removed (fluting), or the material is upset (pushed around and compacted) by button rifling. All the barrel makers mentioned have learned how and when to remove enough stresses to enable them to provide stable, straight, uniform, superbly accurate barrels without damaging the material they are made of. Let's hear it for the barrel makers. If it was easy, everybody would be doing it!

I hope I managed to say what I meant to, and that it helps. Tom
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