Blank for gun barrel, method for producing said gun barrel and gun barrel
AssigneeDamasteel Aktiebolag
InventorPer Billgren
Life of this patent
Estimating the term…
Abstract
Blank for a gun barrel, consisting of a steel bar, which bar, in one or more hot working steps, has been repeatedly wrung about its own longitudinal axis.
Claims7
A method for producing a gun barrel, comprising:
- providing a steel bar;
- wringing the steel bar about its longitudinal axis to a pitch angle of 45-90° in at least two hot working steps while allowing the steel bar to, at least partly, re-crystallize between the hot working steps;
- and
- at least one of drilling and battering the steel bar so-processed along its longitudinal axis.
A method for producing a gun barrel, comprising:
- providing a steel bar;
- wringing, in a single hot working step, the steel bar about its longitudinal axis to a pitch angle of 45-90°;
- and
- at least one of drilling and battering the steel bar so-processed along its longitudinal axis,
- wherein the step of wringing is performed sufficiently slowly to avoid local overheating.
A gun barrel comprising steel that has been repeatedly wrung about its longitudinal axis in at least one hot working step, the steel having been wrung about its longitudinal axis to a pitch angle of 45-90°, the steel bar further having been produced by powder metallurgy, wherein the steel bar comprises a compound material, a first, mainly wear resistant, steel material being arranged towards a center of the bar, and a second, mainly strong, steel material being arranged towards an area outside of the center of the bar, and the steel bar having been one of (i) allowed to re-crystallize between hot working steps and (ii) precluded from local overheating by performing the at least one hot working step in a sufficiently slow manner.
Dependencies are inferred from the claim text.