METHOD OF MAKING BORE WITH GROOVES Russian patent published in 2009 - IPC B21K21/16 B21J5/12 C23C26/00 

FIELD: weapons.

SUBSTANCE: present invention pertains to military equipment and can be used when making high-precision small arms. A mandrel bar or puncheon is put into the channel of barrelled work-piece and a channel with grooves is formed through rotary forging or drawing. The surface of the work-piece channel is pre-activated and then coated with a composition. The composition assumes functions of lubricant material and provides for a wear-proof coating when making the channel with grooves. The composition contains a mixture of homogeneous and heterogeneous catalysts and dispersion reinforcement systems in viscous carrier and natural minerals in the class of carbonates, halogenides, sulphates, silicates and oxides with combined concentration of 20-40 wt %. The natural minerals are modified until formation of a porous layer of minerals on the surface of the channel, forming hydrophilous-hydrophobic splices, filled with organic ligands. The work-piece then undergoes thermal processing for 2-4 hours at 130-140°C, after which a channel with grooves and a wear-proof coating are simultaneously formed.

EFFECT: reduced labour input in manufacturing with improved tactic-technical and operational characteristics of the barrel at the same time.

2 cl, 5 dwg