Shot peening in a blasting cabnet?

[TheSilentChamber]

I'v heard though a few places that you can use a blasting cabinet to do shot peening, just have to change the medium and maby the tip to accomidate it. Anyone know anything about this? I know the basic ideas follow the same principle, but know if this setup would work, or what pressure it would need to be at.

[mike@af]

What's shot peening?

[TheSilentChamber]

http://en.wikipedia.org/wiki/Shot_peening

http://en.wikipedia.org/wiki/Peening

It helps relieve stress and hardens the surface of the metal.

[mike@af]

I dont see why a blast cabinent wouldnt work. Basically all you're doing is shrinking the material by making it thicker. I think the only things to worry about are the feed hose/gun, and the window. A peen on that glass viewing window and its a new ligement on your face.

[SaabJohan]

Originally Posted by TheSilentChamber

http://en.wikipedia.org/wiki/Shot_peening

http://en.wikipedia.org/wiki/Peening

It helps relieve stress and hardens the surface of the metal.

Actually peening introduces a compressive stress in the surface, this can prevent fatigue in high stress areas.

http://www.metalimprovement.com/shot_peening.php

Originally Posted by GTmike400

I dont see why a blast cabinent wouldnt work. Basically all you're doing is shrinking the material by making it thicker. I think the only things to worry about are the feed hose/gun, and the window. A peen on that glass viewing window and its a new ligement on your face.

Usually special equipment is needed.

There are essientially two types of peening machines; centrifugal and pneumatic. The basic principles of the pneumatic machine is similar to blasters, but the actual machine is much more complicated.

CNC Shot peening machine


Shot peening machine for crankshafts


A peening machine in action
http://www.webtraxs.com/dlcount.php?...tary lance.wmv

[Schurkey]

Shot PEENING and shot BLASTING are entirely different processes for entirely different end-results.

Shot peening is a surface treatment that increases fatigue life. It requires special tooling, and is NOT something done at home or even by a small business. This is a serious metal-working process, with aerospace applications--and aerospace quality assurance.

Shot blasting is a surface-cleaning method. Lots of automotive machine shops use a shot-blasting cabinet. The shot knocks the carbon and rust off the casting. Nothing special about it--you load parts into a rotisserie, the machine throws the shot at the part using a centrifugal "pump", and the shot pounds the carbon and rust into dust. If you're smart, you protect the machined surfaces of the casting--the lifter bores, the crank journals, that sort of thing.

I would not expect a normal sandblasting or glass-beading cabinet to accept the steel shot used in shot blasting.