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#588 - 05/25/09 10:38 AM Grease and oil in shot peening process
Johan Pajuluoma Offline
Member

Registered: 05/20/09
Posts: 3
Loc: Södertälje
Hello!

I am new here at shotpeener.com/forum.

I have an question about grease and oil in an wheelblaster.

We shotpeen gears for a gearbox mounted in trucks.

We clean our gears today after honing. The cleaner leave a little little amount of oil on the gears fo corrosive protection.

Now we want to shotpeen the gears after that cleaning process.

I woul like to know if there is any theory about how much oil the income producs can have before it is shotpeened?

We use an wheelblaster from Wheelabrator Shlick with a 0,9mm media (cut wire).

Best regards
Johan Pajuluoma
Sweden

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#589 - 05/26/09 12:27 PM Re: Grease and oil in shot peening process
Walter Offline



Registered: 05/03/99
Posts: 158
Loc: East Hartford, CT, USA
Having any amount of oil on the parts during peening is a very bad idea.
• There is a possibility the oil could act as a cushion and reduce the peening intensity
• The oil, shot, and dust in the machine will combine and make screening your shot next to impossible.
• Eventually your machine will be clogged up with this combination causing you expensive and time consuming delays.
• Every peening specification I have seen requires part(s) to be free of grease, dirt, oil, corrosion, and corrosion-preventive coatings. So unless you’re working to your own internal specification you would likely be in violation of the shot peening specification if you were to do this.

I strongly suggest you thoroughly degrease the parts prior to peening.

Walter Beach
Peening Technologies

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#590 - 05/29/09 03:47 AM Re: Grease and oil in shot peening process
Johan Pajuluoma Offline
Member

Registered: 05/20/09
Posts: 3
Loc: Södertälje
Thanks for a quick reply Walter.

Your answer strengthen our misgivings about this.

We tought that the amount of oil on gears before peening must be reduced completely but was hoping that there were any way of calculating it.

This lead us to an inveastment in new washing machines.

Best regards Johan

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