Steel compression?

[Brock Cutlery]

So I hesitate a bit to open this up, but here it is. Is this a real thing or voodoo?

OUR BARREL MAKING PROCESS

We utilize a "pull-button" rifling process to make our barrels. This involves pulling a precision ground hard carbide tool, called a "button," thru a drilled and reamed hole in the barrel blank. This button is larger than the reamed hole and therefore displaces steel to form the groves and lands of the rifling. This process results in a very uniform surface that is hardened as a consequence of the compression of the steel and "work hardening".

 

[Stacy E. Apelt - Bladesmith]

The button "displaces" the steel, and creates the lands and grooves. It work hardens the metal by creating severe disruptions in the grain boundaries. The steel is not compressed, just relocated.

 

[Natlek]

So I hesitate a bit to open this up, but here it is. Is this a real thing or voodoo?

OUR BARREL MAKING PROCESS

We utilize a "pull-button" rifling process to make our barrels. This involves pulling a precision ground hard carbide tool, called a "button," thru a drilled and reamed hole in the barrel blank. This button is larger than the reamed hole and therefore displaces steel to form the groves and lands of the rifling. This process results in a very uniform surface that is hardened as a consequence of the compression of the steel and "work hardening".

I think that this is what they look for ............grain in steel

 

[jdm61]

But tell me this. Do they pack the edge?

 

[kuraki]

Work harden yes, compression no. But Schneider Barrels rarely show up on the precision rifle blogs list of barrels used by top shooters, which means more to me than how they rifle or what they claim.

 

[Ken H>]

Stacy's got it right, the steel is "pressed" to a different location - just like a roll tap does when forming threads.

 

[Larrin]

It is possible to put the surface in a compressive stress state through techniques like shot peening. You can read about the effect here: https://en.m.wikipedia.org/wiki/Shot_peening

A similar effect might be created with these barrels though I’m not sure.

 

[JTknives]

But tell me this. Do they pack the edge?

Yeah that's what I'm wondering to. It is a lost art now a days. I can't seam to find anyone that can do it.

 

[Frank Niro]

The "button" is a cutter and "chips" are created and removed. I can't believe this cutting action will create a compressed surface.
Frank

 

[JTknives]

The "button" is a cutter and "chips" are created and removed. I can't believe this cutting action will create a compressed surface.
Frank

I know of 3 ways that are used to rifle a barrel. One is cut rifling, where a brooch is used and it turns as it's pulled through. This cuts the rifling into the steel. The next way is button which is a carbide button that's shaped with rifling. It is pulled through the bore and forums the steel into rifling, this usaly makes a nice smooth burnished finish. The last way is hammer forged, where a rifled shaped plug is inserted in the bore and a hammer machine hammers the outside of the barrel which forges the bore around the rifled shaped plug.