Re: shot pein ?
[Re: moparx]
#2721355
12/04/19 01:58 PM
12/04/19 01:58 PM
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Joined: Oct 2005
Posts: 8,828 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,828
Ontario, Canada
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Well, you obviously haven’t tried googling shot PEENING.... Why do research when you can have someone else do it for you.
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Re: shot pein ?
[Re: moparx]
#2721389
12/04/19 03:51 PM
12/04/19 03:51 PM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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when shot peining items, what is the guage of shot used, and the typical air pressure ? as always, TIA. Me thinks that those in the know, the shops who do that, are not going to share their procedures on the interweb
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: shot pein ?
[Re: AndyF]
#2721455
12/04/19 07:45 PM
12/04/19 07:45 PM
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Joined: Oct 2005
Posts: 8,828 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,828
Ontario, Canada
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Yeah, and the rods are stronger and cost about as much as grinding and peening would !
FWIW, a few years back I bought a sack of shot and dumped it in my blast cabinet (home made). The intent was not so much to remove stress risers but rather to give a more uniform appearance to some cast parts that I'd ground the flashing and parting lines. The shot size was S170 which is quite small and the cabinet is a siphon feed. I run it at from anywhere from 70 to 100 PSI and it worked fine and yielded the results I was after. But not knowing the intricacies, I'd never peen parts for anything other than a cosmetic finish. For those curious, unlike most blast media, shot does not remove any material, it merely changes the surface profile.
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Re: shot pein ?
[Re: Stanton]
#2721648
12/05/19 12:25 PM
12/05/19 12:25 PM
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Joined: Apr 2003
Posts: 3,496 Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,496
Tulsa, Oklahoma
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Well, you obviously haven’t tried googling shot PEENING.... Why do research when you can have someone else do it for you. Bad information on the Internet has cost me a lot of money. I would at least like to get the viewpoint of folks that are here.
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Re: shot pein ?
[Re: A727Tflite]
#2721714
12/05/19 03:01 PM
12/05/19 03:01 PM
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Joined: Dec 2003
Posts: 22,695 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,695
Bitopia
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Seems like it would almost be impossible to do any harm shot peening no matter what method the OP used vs doing it correctly, unless OP used rock salt, cannon balls or similar.
Please correct this if I am overlooking something..
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: shot pein ?
[Re: 340Cuda]
#2721787
12/05/19 06:26 PM
12/05/19 06:26 PM
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Joined: Sep 2003
Posts: 19,237 north of coder
moparx
OP
"Butt Crack Bob"
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OP
"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,237
north of coder
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Well, you obviously haven’t tried googling shot PEENING.... Why do research when you can have someone else do it for you. Bad information on the Internet has cost me a lot of money. I would at least like to get the viewpoint of folks that are here. plus the fact some of you know your way around the keyboard searching thing WAY better than this old fart. also as mentioned, other's viewpoint on subjects count far more than what is printed on the webs because of actual experience. [real life] lots of times theory and practice are two different things. thanks to those who are attempting to expand my knowledge on this subject. [and i don't think being shot in the pein would be much fun. ]
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Re: shot pein ?
[Re: B G Racing]
#2722081
12/06/19 05:05 PM
12/06/19 05:05 PM
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Joined: Sep 2005
Posts: 1,328 St. Louis, MO
mopardamo
pro stock
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pro stock
Joined: Sep 2005
Posts: 1,328
St. Louis, MO
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As I understand, it induced stress parallel to the plane of the part surface. This reduced the chance of a stress fracture beginning at the part surface. Anyone else have a different understanding of how it works?
Last edited by mopardamo; 12/06/19 05:06 PM.
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Re: shot pein ?
[Re: mopardamo]
#2722091
12/06/19 05:46 PM
12/06/19 05:46 PM
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Joined: Jan 2003
Posts: 3,504 DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,504
DFW
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Shot peening is a cold working process used to produce a compressive residual stress layer and modify the mechanical properties of metals and composites. It entails striking a surface with shot (round metallic, glass, or ceramic particles) with force sufficient to create plastic deformation.[1][2] In machining, shot peening is used to strengthen and relieve stress in components like steel automobile crankshafts and connecting rods. In architecture it provides a muted finish to metal. https://en.wikipedia.org/wiki/Shot_peening
Floyd Lippencott IV
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Re: shot pein ?
[Re: mopardamo]
#2722107
12/06/19 07:35 PM
12/06/19 07:35 PM
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Joined: Jan 2003
Posts: 30,945 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 30,945
Oregon
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Hey 340, Wiki first states that it adds compressive stress then later says relives stress. Thats the stuff that i'd like to get to the bottom to. Which one add/relieve? An old mentor of mine that was McDonnell Douglas ball bearing top dog said it added stress. I'm on same page as Transman. There is no universal answer, it just depends on the process that the factory follows. Typically the internal stress from forging would be taken care of by tempering. Then the part is machined, heat treated and shot peened. But engineers are free to experiment with different process flows so there might be someone somewhere who decides to shot peen after forging but before machining. In that case the shot peening would relieve internal stresses.
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