Production of gun barrel

FIELD: weapons and ammunition.

SUBSTANCE: proposed method comprises barrel boring and reaming. Then, barrel bore is subjected to mandrelling. Gun barrel is subjected to annealing with heating to 0.9-0.95 of α to γ phase transition temperature at the rate not higher than 10-15°C a minute and to finishing mandrelling. Holding in heat treatment makes 85-95 minutes while cooling is performed at the rate not over 15°C a minute.

EFFECT: higher accuracy of hits and reliability.

2 cl

 

The invention relates to defense technique, namely the production of gun weapon systems, and can be used for the manufacture of barrels of small arms for precision rifles or sniper rifles.

A known technology for manufacturing wear-resistant barrel firearms, including cleaning of the barrel and its subsequent processing ultrafine powder according to the patent RU 2169328 C1, 20.06.2001 selected as analog. The processing of the powder is carried out by applying it on the outer surface of each shell and the inner surface of the barrel before each shot series, consisting of at least 3-5 shots. Ultra-fine powder consists of natural mineral or a mixture of natural minerals composition of Mg3[Si2O5](OH)4in the amount of 1-1,5 g/ml, injected into the process fluid (kerosene or white spirit"). The disadvantage of this method is the complexity of implementation systematically recurring operations and the costs of implementing methods that are not justified by the level of survivability of the trunk.

The closest prior art is a method of manufacturing a shaft according to the patent RU 2446904 C1, 10.04.2012 selected as the closest analogue (prototype). The method includes machining the receiver of the workpiece. The bore drilling process, deployment and subsequent radial compression. Then, inside a bore put chrome and heat up the barrel in a vacuum or in an inert atmosphere at a temperature not higher than the tempering temperature of 600±5°C, and after conducting an operation of forming the field and the rifling of the barrel. The disadvantage of this method is a great complexity in ensuring the uniformity of thickness of the coating of chromium. In addition, when the compression of the barrel and the resulting stress occurs the probability of occurrence in the bore cracks that reduce the reliability of small arms due to corrosion of the surface of the bore, as each crack, and a lot of them in the presence of stress, is the hub of air, moisture and dust.

The technical result of the claimed invention is to improve the accuracy of fire due to the alignment of the bore, as well as stable and homogeneous structure of the metal. In addition, the invention is directed to the removal of residual stresses in the metal in the manufacture of the barrel and preventing their occurrence in the process of firing.

The technical result of the claimed invention is achieved in that the alignment is ensured by the operations of preliminary and final burnishing with the introduction of high-temperature annealing between these operations, a slow heating during the annealing and cooling of the metal of the barrel, relaxing (decrease) residual voltage is ageni and prevent their appearance in the final process of burnishing. Acceptable way to relieve residual stresses in the metal of the barrel that appears when drilling a bore, it scan and then pass the preliminary donovani, as well as to achieve a stable and homogeneous metal structure of the barrel is, as mentioned above, prolonged annealing at the temperature of 0,9-0,95% of the temperature of the phase transition α in γ the condition of the metal stem in stagnant argon aged and cooled in flowing argon. Heating and cooling operate at a speed not exceeding 10-15°C per minute. During pre-burnishing is not achieved final inner diameter of the barrel. Process pre-burnishing usually includes up to 100 passes mandrel with grease.

The heat treatment is carried out as follows. The barrel is made of stainless steel, for example, 12X13, place in the oven, hanging in a vertical position. Argon in oven stagnant. The heating rate to a temperature component 0,9-0,95% of the temperature of the phase transition α in γ the condition of the metal shaft should not exceed 10-15°C per minute. Vertical placement of the stem and the slow heating rate allow you to uniformly heat the barrel to the section and length without surface oxidation. Upon reaching temperature, component of 0.95% of the temperature of the phase transfer is Yes α in γ condition, make the shutter speed 90±5 minutes. In the process of aging in the metal is the process of structural stabilization of the metal due to the alignment parameters previously distorted lattice, are encountered during drilling, burnishing a bore, increasing the ductility of a metal due to an increase in the number of dislocations, eliminating the temperature gradient over the cross section and alignment of the chemical composition in the metal structure due to certain natural distribution of atoms in space metal. Slow heating and slow cooling can eliminate warping of the barrel, i.e. changing its size and shape. Since the voltage is removed by plastic deformation, it increases the possibility of a natural distribution of the atoms, especially foreign in space and, accordingly, decrease in the elastic deformation and distortion of the crystal lattice, additionally, there is no temperature gradient across the section of metal, there is no tensile and compressive stresses.

After annealing perform final (finishing) of burnishing, including not more than 10 passages with lubrication. This is a small number of passes does not detrimentally impact on the structure of the metal, because its structure is achieved when the annealing is stable, homogeneous and has high ductility, FPIC is service to relax (reduce) minor impact in the final process of burnishing.

The method is as follows.

After the stage of drilling and sweep the barrel is treated with Dorn on the preliminary operation of burnishing. The drawing mandrel carried out necessarily lubricated. Deformation of the metal surface layer and residual stresses introduced during drilling and metal scan and processing the mandrel, removed by heating the barrel to a temperature component 0,9-0,95% of the temperature of the phase transition α in γ the condition of the metal of the barrel. The barrel when it is placed in the furnace, hanging in a vertical position using the gripper. The environment in the furnace - stagnant argon. The heating is carried out with a rate of 10-15°C per minute. The shutter speed when the temperature of 0,9-0,95% of the temperature of the phase transition α in γ the condition of the metal of the barrel is 90±5 minutes. Cooling of the barrel carried out with a rate of 10-15°C per minute, while the argon serves on the duct. Then produce the final (finish) processing bore donovania lubricated with getting to the end of the process the required settings of the barrel and the structure of the material for subsequent formation into the bore rifling and fields.

Inspection of the alignment of the shaft of the claimed technology has shown satisfactory results. Evaluation of metallographic method of metal structure, carved from propusknoy part with the ox, showed the optimality of the proposed technology for the processing of the barrel firearms from stainless steel.

1. A method of manufacturing a barrel of small arms, including machining with the formation of a bore by drilling, and then scan, characterized in that the bore is subjected to pre-processing method of burnishing, then the barrel of a small arms is subjected to heat treatment in the form of simulated annealing by heating to a temperature component 0,9-0,95% of the temperature of the phase transition α in γ the condition of the metal barrel not exceeding 10-15°C per minute, and finishing donovania.

2. A method of manufacturing a shaft according to claim 1, characterized in that the shutter speed when the heat treatment is 85-95 minutes, and cooling is carried out at a speed of not more than 15°C per minute.



 

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