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shot pein ? #2721145
12/03/19 11:54 AM
12/03/19 11:54 AM
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Posts: 12,182
north of coder
moparx Offline OP
"Butt Crack Bob"
moparx  Offline OP
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north of coder
when shot peining items, what is the guage of shot used, and the typical air pressure ?
as always, TIA. up
beer

Re: shot pein ? [Re: moparx] #2721346
12/04/19 12:34 PM
12/04/19 12:34 PM
Joined: Sep 2003
Posts: 12,182
north of coder
moparx Offline OP
"Butt Crack Bob"
moparx  Offline OP
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north of coder
anyone ? shruggy
beer

Re: shot pein ? [Re: moparx] #2721349
12/04/19 12:38 PM
12/04/19 12:38 PM
Joined: Nov 2007
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Kirkland, Washington
Pacnorthcuda Offline
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Kirkland, Washington
Well, you obviously haven’t tried googling shot PEENING....

Re: shot pein ? [Re: Pacnorthcuda] #2721352
12/04/19 12:50 PM
12/04/19 12:50 PM
Joined: Sep 2003
Posts: 12,182
north of coder
moparx Offline OP
"Butt Crack Bob"
moparx  Offline OP
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now that you mention it, no.
i guess i need spelling lessons ! biggrin
thanks.
beer

Re: shot pein ? [Re: moparx] #2721355
12/04/19 12:58 PM
12/04/19 12:58 PM
Joined: Oct 2005
Posts: 7,219
Ontario, Canada
S
Stanton Offline
Don't question me!
Stanton  Offline
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Ontario, Canada
Quote
Well, you obviously haven’t tried googling shot PEENING....


Why do research when you can have someone else do it for you.

Re: shot pein ? [Re: moparx] #2721389
12/04/19 02:51 PM
12/04/19 02:51 PM
Joined: Aug 2003
Posts: 34,012
Bend,OR USA
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Cab_Burge Offline
I Win
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Bend,OR USA
Originally Posted by moparx
when shot peining items, what is the guage of shot used, and the typical air pressure ?
as always, TIA. up
beer

Me thinks that those in the know, the shops who do that, are not going to share their procedures on the interweb shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: shot pein ? [Re: Cab_Burge] #2721408
12/04/19 03:32 PM
12/04/19 03:32 PM
Joined: Jan 2003
Posts: 3,535
The Netherlands
BigBlockMopar Offline
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Shops that share get more customers.
People value if someone shows experience in a field and what they are doing.

Of course trade secrets which gain you a nice profit over local competition could be considered private, or just go into too much detail which canbe irrelevant for an outsider.
But the average customer mainly likes to know / be shown you have experience in your field.

Re: shot pein ? [Re: moparx] #2721417
12/04/19 04:11 PM
12/04/19 04:11 PM
Joined: Jan 2003
Posts: 26,483
Oregon
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AndyF Offline
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It is all written down somewhere. I did some shot peening 30 years ago and there was a measurement method involving a strip of metal which you peened and then you measured how much it curled up. That gave you a number. Then you looked in the book and it told you what number to shot peen connecting rods. We shot peened factory rods after they had been deburred on a big sanding roll. That was 30+ years ago and I wouldn't waste my time with any of that crap these days. Now I just call Summit for some chrome moly BB Chevy rods and give them a credit number. The rods show up in 2 days and I bolt them in the engine.

Re: shot pein ? [Re: AndyF] #2721455
12/04/19 06:45 PM
12/04/19 06:45 PM
Joined: Oct 2005
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Ontario, Canada
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Stanton Offline
Don't question me!
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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.

Re: shot pein ? [Re: Stanton] #2721648
12/05/19 11:25 AM
12/05/19 11:25 AM
Joined: Apr 2003
Posts: 2,650
Tulsa, Oklahoma
340Cuda Offline
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Tulsa, Oklahoma
Originally Posted by Stanton
Quote
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.

Re: shot pein ? [Re: moparx] #2721677
12/05/19 12:32 PM
12/05/19 12:32 PM
Joined: Mar 2011
Posts: 1,292
Michigan
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Transman Offline
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Michigan
If I can find the process standard we used at Chrysler I’ll send it to you.

In the meantime I would read up on the practice - a fair amount of info on the web exists.

You would be surprised how many items get peened in passenger car and truck production.

Re: shot pein ? [Re: Transman] #2721714
12/05/19 02:01 PM
12/05/19 02:01 PM
Joined: Dec 2003
Posts: 18,253
Trumussia
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jcc Offline
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Trumussia
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..


"Perfection is the enemy of Excellence" German Engineer
Re: shot pein ? [Re: jcc] #2721760
12/05/19 04:07 PM
12/05/19 04:07 PM
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Posts: 1,673
Philadelphia
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radar Offline
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Philadelphia
Nobody wants to get shot in the pein.

Re: shot pein ? [Re: 340Cuda] #2721787
12/05/19 05:26 PM
12/05/19 05:26 PM
Joined: Sep 2003
Posts: 12,182
north of coder
moparx Offline OP
"Butt Crack Bob"
moparx  Offline OP
"Butt Crack Bob"

Joined: Sep 2003
Posts: 12,182
north of coder
Originally Posted by 340Cuda
Originally Posted by Stanton
Quote
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. laugh2]
beer

Re: shot pein ? [Re: moparx] #2721927
12/06/19 06:21 AM
12/06/19 06:21 AM
Joined: Mar 2006
Posts: 9,890
Eighty Four, PA
B G Racing Offline
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The process has been around for decades,as mentioned it's a process of finishing a part with air and fine metal particals.The purpose is to give a part a consistant uniform finish an to remove and residual flash as well as give the surface a finish void of any irregularities.This process was used in most all military specs for part realiability.Most know that any type of irregularity in the surface of a critical part can be the beginning of a crack or other type of failure.With all this being noted with the new processes of finished material from casting,forging and billit parts seldem need shot peening.Also the quality of the raw materials made with the new techonology help eliminate inperfection in the product.This process also helped in materisl testing giving the part a visiable consistant surface to inspect with the different process such os x-ray,zyologo,and magnetic partical testing.

Re: shot pein ? [Re: B G Racing] #2722081
12/06/19 04:05 PM
12/06/19 04:05 PM
Joined: Sep 2005
Posts: 1,326
St. Louis, MO
mopardamo Offline
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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 04:06 PM.
Re: shot pein ? [Re: mopardamo] #2722089
12/06/19 04:45 PM
12/06/19 04:45 PM
Joined: Mar 2011
Posts: 1,292
Michigan
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Transman Offline
pro stock
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Michigan
Ask 4 different metallurgists the same question and you will get 5 different opinions.

But all the ones I asked about peening all said pretty much the same thing.

Every forging, casting or stamping benefits from peening. All of them. Regardless when they were made - 50 years ago or last week.
(Forged cranks, rods,etc. are made pretty much the same way as they were 50 years ago).

Peening builds compression stress at the surface. This is a good thing.

Re: shot pein ? [Re: mopardamo] #2722091
12/06/19 04:46 PM
12/06/19 04:46 PM
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Posts: 3,359
DFW
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mr_340 Offline
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DFW
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
Re: shot pein ? [Re: mr_340] #2722097
12/06/19 05:52 PM
12/06/19 05:52 PM
Joined: Sep 2005
Posts: 1,326
St. Louis, MO
mopardamo Offline
pro stock
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St. Louis, MO
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.

Re: shot pein ? [Re: mopardamo] #2722107
12/06/19 06:35 PM
12/06/19 06:35 PM
Joined: Jan 2003
Posts: 26,483
Oregon
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AndyF Offline
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Oregon
Originally Posted by mopardamo
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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