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#1415 - 05/07/19 02:34 PM Sieve Analysis
Rich Offline
Member

Registered: 04/10/19
Posts: 9
Loc: Texas
Hello, I'm new to Shot Peening. In developing the Sieve Analysis procedure, I created an excel to calculate the percent pass. However my question is (rather 2):

1) Other than a visual - how does graphing the results help? To me it is either passing the percentage or not.
2) Per AMS2430U It seems I only need 2 sieves per table 1 pg 4, One that allows .5% to be retained on sieve and on that allows 20% to pass through, thus 80% retention in sieve.

So my question is :Is my interpretation correct and why in all my searches everyone is using 5 or more sieves?

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#1416 - 05/07/19 04:48 PM Re: Sieve Analysis [Re: Rich]
Walter Offline



Registered: 05/03/99
Posts: 155
Loc: East Hartford, CT, USA
Rich,

First one must understand that there are different requirements for NEW Peening Media and In-Process Peening Media.

New Media is tested per AMS2431 5 SCREENS

In-process media is tested per AMS2430 2 SCREENS

There are different requirements for each. However, if you chose to always test your media to the as New Media, you would always pass the In-process test. Not necessarily a bad way to go but you are wasting a bit of time and wear and tear on your test sieves.

I'm not sure exactly what you mean by "graphing" in your first question, can you elaborate?

Personally, I use the two screen method but I changed the requirement to be 10% passing / 90% retained in my internal procedures. I track the data in Excel, this way I can see if a trend is developing and change the screen(s) in the peening machine before it becomes a specification violation. If you do this, make sure you word your procedure in a way that explains this is a preventive action and not a hard requirement trumping AMS2430.

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#1417 - 05/07/19 05:06 PM Re: Sieve Analysis [Re: Rich]
Rich Offline
Member

Registered: 04/10/19
Posts: 9
Loc: Texas
Thanks for the response.

I've looked through AMS2431 and have found nor reference to sieve analysis. though what you say makes since - I still would like to know where that info came from.

as for graphing - in my searches on how to do sieve analysis - all examples given not only show the breakdown for percentages passing but also have it in a graph. (A Scatter Chart showing the curve in comparison to the exposure time)

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#1418 - 05/07/19 05:09 PM Re: Sieve Analysis [Re: Rich]
Walter Offline



Registered: 05/03/99
Posts: 155
Loc: East Hartford, CT, USA
You need to look at the particular slash document such as AMS2431/1, /2

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