Method to form coating of internal surface of firearms barrel

FIELD: weapons and ammunition.

SUBSTANCE: when manufacturing an item, formation of a coating on an inner surface of a barrel, smooth or rifled barrel, is carried out by means of mechanical pressure from a tool in the amount of at least 2.5 N/mm2. The coating material is represented by finely dispersed powders of natural mineral materials with energy density of at least 80 kJ/cm2 or their mixtures with a process medium. As a result, the coating with thickness of at least 50 mcm is produced. In process of operation the coating of the inner surface of the barrel is recovered periodically via a number of shots determined for each type of firearms by means of a tool developing pressure of at least 2.5 N/mm2 and by using powders of natural mineral materials or their mixtures with a process medium at the ratio of 1:1.

EFFECT: on an inner surface of a firearms barrel a corrosion-resistant coating is produced, which recovers the inner surface of the barrel and increases close pattern of shooting.

2 cl, 2 ex

 

The invention relates to a defense technique, namely the production of gun weapon systems, and can be used in repair operations in repair shops or in the field.

The problem of survivability of barrels of artillery and small arms [1-8] is extremely sharp, as the trunk is the most short-lived of the critical parts of the weapon. The average duration of fixed nodes guns is an order of magnitude greater than the persistence of the trunk.

The persistence of the barrels is estimated by the number of shots on a full charge, which can be done to the output shaft of failure due to wear. The trunk reaches the limit of survivability, if the fire is detected by one of the following criteria:

- drop the initial velocity of the projectile is 10% of the average nominal;

- maximum pressure of the powder gases decreased to a value at which there is no cock more than 30% of the main fuses in the shooting at the smallest charges;

- the product of the magnitude of the likely deviation range on the probable lateral deviations increased by 8 times compared to table.

The survival of the trunk, depending on the capacity and calibre varies within very wide limits: for instruments low-power - bore is only thousands of shots, for guns average power - a few hundred shots and for the most powerful gun of large caliber - a few dozen shots.

In practice, the persistence of the shafts is controlled by measuring the initial velocity of the projectile.

The survival of the trunk is determined by the intensity of wear of the inner surface of the barrel. To reduce the use of a special grade of steel, removable insert, and continuous cooling trunks and other methods.

One of the ways to increase the survivability of the barrel is the use of coating the inner surface of the barrel, reducing its wear and tear.

There is a method of lubrication bore, parts and mechanisms of firearms, including cleaning and application of protective layer, characterized in that the protective layer is applied by polishing the ultra-fine powder of polytetrafluoroethylene (EPTFE) [9].

This method achieved the following result:

- no corrosion trunks in the process of storing up to 6 months;

- restore the appearance of the inner surface of the barrel when the six-time application of the method before shooting;

- improved accuracy of fire.

The disadvantage of this method is that to maintain a stable condition of the barrel periodically to process the inner surface is due to insufficient adhesion UPTFE and metal. To improve survivability with this method, therefore, requires constant final processing of the shafts, which causes inconvenience in the field.

Another method of applying the coating of the inner surface of the shafts is a method of manufacturing a wear-resistant barrel firearms [10], including pre-treatment and processing of ultra-fine powder or a mixture of ultra-fine powder and technological environment that is executed before each shot series, consisting of at least 3-5 shots, by applying ultra-fine powder, or mixtures thereof with the process medium on the outer surface of each shell and the inner surface of the barrel, while ultra-fine powder prepared from a natural mineral or a mixture of natural minerals, selected from a series of layered silicates, including various structural modifications of the composition of Mg3[Si2O5](OH)4and the content of natural mineral or a mixture of natural minerals in the technological environment take at least 1.0-1.5 g/ml and the number of shots in the series and the content of the ultrafine powder in the technological environment set depending on the condition of the inner surface of the barrel.

This method is achieved by the following result [10]:

for small arms firing accuracy is velocipede source of 9.5-7.5 cm to 4.0 cm;

for guns (caliber 128,5 mm) accuracy increased 1.4 times.

The disadvantage of this method is the need for the formation of coating the inner surface of the barrel repeated administration of suspension in the trunk and on the surface of the projectile and the related instability characteristics of the coating.

The third method of producing coatings on the inner surface of the barrel is a method for coating the bore of the firearm, including the operation of pre-processing the channel surface and the coating, wherein pre-processing the surface of the bore is carried out with a mixture of natural minerals and biological enzyme systems, dissolved and suspended in isopropyl alcohol at a temperature of 50-80°C for 60-90 min, and then put a layer of a polyfunctional compound (SPF), consisting of a mixture of homogeneous and heterogeneous catalysts and dispersion-hardening systems in a viscous medium, which is subjected to heat treatment within 2-4 hours at a temperature of 110-120°C, then trunk collect weapons, which charge by the bullet or projectile and shoot for hardening the coating, the number of reinforcing shots and the damage of the coating layers set depending on the caliber of the barrel. The shooting process and applying To the F. is repeated a certain number of times depending on the caliber of the barrel.

Using this method we obtained the following results [11]:

when hardening shots forms a protective cover, which is a continuous, non-uniform film thickness of about 5-20 μm, with a clear and wide (10-20% of the thickness of the layer) diffusion transition zone of the protective coating in the metal, which ensures the durability of the barrel during operation, eliminates the defects of the geometry of the bore, as well as corrosion and erosive lesions;

obtained in this method the coating is not inferior to chrome for durability and superior preservation of internal and external ballistics of the weapon.

The disadvantages of this method are unstable characteristics of the coating and unstable reliability and survivability of the trunks.

Thus, from the description given analogues shows that the geometrical and physico-mechanical characteristics of the coating are shown analogues do not provide stability and predictable results in the formation of the coating analogues do not provide manufacturability, ease of formation of coatings in the manufacture and restoration of the barrel in the process of repair or operation and does not solve the problem of increasing the survivability of the barrel to the level of survivability of the other mechanisms artill who enters the country from small arms, although substantial improvements in a number of characteristics of the trunk.

As a prototype of the selected method of obtaining the barrel of a firearm [11] due to the similarity of technologies of formation of the coating.

In the prototype are obtained the following characteristics stem:

- coating thickness variable from 5 to 20 µm in length and diameter of the trunk;

- the floor is not inferior to chrome plating for durability;

- coating method outperforms chrome plating on the internal and external ballistics of the barrel, ie, in particular, the initial velocity of flight of the projectile.

As previous counterparts, the prototype has the same disadvantages: unstable characteristics of the coating, the lack of its formation in the conditions of production, repair and maintenance.

The basis of the invention is tasked to provide a method of forming a coating of the inner surface of the channel trunks artillery and small arms, in which the initial velocity of the projectile can be maintained constant over the entire service life of the tools or pattern of small arms in General.

The technical result is the stability of the initial velocity of flight of the projectile is achieved by improving the mechanical characteristics of the base material of the inner surface of the barrel, used for formation of the surface is on a layer of mineral materials of natural origin, processing of the surface layer, allowing to provide the required information to solve the problem of physical-mechanical characteristics of the material.

The technical result is ensured by the fact that in the method of forming the coating of the inner surface of the barrel of a firearm in the manufacture of products, the formation of the coating on the inner surface of the barrel, smooth or rifled through mechanical pressure, as the coating material used fine powders of natural mineral materials or their mixtures, with energy density [12] at least 80 kJ/cm2with the technological environment, the formation of the coating is performed at a pressure from the tool is not less than 2.5 N/mm2the thickness of the coating provide not less than 50 μm, and the operation shafts guns or small arms mineral coating of the inner surface of the barrel resume periodically through specific for each type of guns or small arms, the number of shots through a tool that creates the pressure when using powders of natural mineral materials or their mixtures with the process medium in a 1:1 ratio.

Examples of specific implementations

Example 1. The barrel 122-mm howitzers with the inner surface coated with a mixture of serpentine and carbon dioxide circa the Oia to obtain a matte surface. Produced a series of shots on a full charge. Increasing the initial velocity of the projectile during interval running-in coating 10 shots was 0.41%. After another 100 rounds the value of the initial speed of flight of the projectile remained constant. For mortar of the specified type at the average statistics for the interval to 1000 shots changing the speed of flight of the projectile from the number of shots on a full charge is fixed at 0.25% of the original value. The speed of roll back of the trunk decreased by 2.1%.

Example 2. The trunk of the D30 howitzers treated with a mixture of serpentine and silica. A series of shots at half charge. Increasing the initial velocity of the projectile during interval running-in coating 10 shots amounted to 0.9% of the average of the initial value. Setting the initial velocity at the further shooting remained constant for the periodic renewal of the inner surface of the barrel.

These examples show that the claimed method allows for consistency one of the main parameters characterizing the persistence of the trunks.

Sources of information

1. Ivanov V.A., Gorovoy V.B. have been the design and operation of the artillery armament of the Russian army. Moscow: publishing house of the compromise. state technical University, 2005, 260 S.

2. Eagles BV, Larman E.K., Malikov VG Device and the project is the formation of barrels of artillery. M: "engineering", 1976, 432 S.

3. The design of missile and gun systems. / Under. edit Bavorov. M: "engineering", 1974, 827 S.

4. Reference officer ground artillery. Ed. Wearemedia, 399 S.

5. Tapton AS. Production of artillery systems. Barongis, 1960, 340 S.

6. Gordienko NI Theory and calculation of artillery. Penza, 1967.

7. Artillery weapons. Fundamentals and device design. M: mechanical engineering, 1975.

8. Serebryakov ON Internal ballistics of the receiver systems and propellant rockets. M: Barongis, 1962, 703 S.

9. Patent No. 2074349 from 27.02.1997. Method of lubrication bore, parts and mechanisms of a firearm.

10. Patent No. 2169328 from 20.06.2001. A method of manufacturing a wear-resistant firearm's barrel.

11. Patent No. 2338990 from 20.11.2008. The method of obtaining the barrel of a firearm.

12. Zuev V.V. Constitution, properties of minerals and Earth structure (energy aspects). SPb.: "Science", 2005, 400 S.

1. Method of forming a coating on the inner surface of the barrel of a firearm, characterized in that in the manufacture of products, the formation of the coating on the inner surface of the barrel, smooth or rifled, is realized by means of mechanical pressure, the coating material used with the energy density of at least 80 kJ/with the 2fine powders of natural mineral materials or mixtures thereof with the technological environment, and the formation of the coating is performed at a pressure from the tool is not less than 2.5 N/mm2and the thickness of the coatings provide not less than 50 μm.

2. The method according to claim 1, characterized in that during the operation of coating the inner surface of the barrel resume periodically through specific for each type of firearms the number of shots through a tool that creates a pressure not less than 2.5 N/mm2and when using powders of natural mineral materials or their mixtures with the process medium in the ratio of 1:1.



 

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