Homemade cryogenic deburring machine?

[grepper]

If I got a tank of liquid nitrogen, could I get a blade cold enough to:
http://www.arrowcryogenics.com/cryogenic...-deburring


The Deflashing and Deburring Process
Using liquid nitrogen during our deflashing and deburring process, components are lowered to a temperature that allows the material to become brittle. Then, utilizing our cryogenic deflashing machines the flash and burrs are easily removed without altering the finish on the parts.
 
How cold would steel have to be to become brittle enough affect deburring?

How about dry ice?  How about just sticking it in the freezer?
 
Would the blade edge instantly warm too much the moment it was removed from the source of cold?

After looking around a bit, I guess storing liquid nitrogen is not exactly practical.  Dry ice a cheap though and apparently you can purchase various cryo freeze stuff in handy cans. 

This is probably a really silly post, but it got me wondering.

[EOU]

Well Mr. Silly Post here's one that might even one-up you. The edge and the burr are  so thin that they might very quickly conform (if not conform then warm rapidly) to or near room temperature. It would seem that any significant lowering in the steel temperature would make it more brittle so even if it isn't cryogenically cold it could benefit. How about deburring "on" a piece of dry ice? Not practical but could be informative.

Wonder if part of the cryogenic deburring doesn't have to do with metal transformation. Seems like people sell baseball bats and tools that have been cryogenically treated. Could be the burr just falls off after treatment.

[Jan]

Cryogenic treatment at -300°F is supplementary heat treating process which can permanently alter microscopic steel structure. 

Jan

[Mark Reich]

I've been using LN since the beginning, and I've treated hundreds of blades. One thing you do not do is cryo blades with burrs, unless you Want random pieces of blades.  

[grepper]

Huh. Are you saying that if you freeze a blade with burrs the blade shatters, but if the edge is clean it does not? i wonder why that happens. Interesting.

My original thinking was that because cold steel is more brittle, it might make deburring easier. I was thinking that you could just direct a fine blast of cold right at the edge as it was deburred. Kind of like coolant in milling operations, only a super cold stream.

[Mark Reich]

I was trying to apply my experience with LN to your query, Mr Grepper.

Sorry, it's not directly applicable to your intended use.