Method of production of gun barrel

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to military technology, namely the technology of production of gun barrels. The method of production of a gun barrel consists in the fact that the solid blank on the length of the barrel is cut along the horizontal axis. In each part of the blank a recess is cut for the bore, the surface of the recess is machined. The prepared surface is coated by the method of argon-arc welding in combination with the self-propagating high-temperature synthesis. The non-consumable electrode is used as tungsten-rhenium, and the filler electrode - as the electrode of compacted exothermic mixture of titanium powder with boron and/or carbon. After welding the finishing treatment of horizontal surfaces of the blanks and the surfaces of welding of recesses is carried out to the desired calibre of the barrel. Connection of the treated blank parts to each other to the barrel is carried out on the outer surface by winding with interference in layers of high-strength steel wire or ribbon, or a ribbon of carbon fibre.

EFFECT: reducing the weight of the gun, reducing the bending vibrations of the barrel, increasing the durability of the coating while maintaining high service characteristics.

4 dwg

 

The invention relates to military technology, namely the technology of manufacturing gun barrels, and can be used in the manufacture of all types of firearms.

The barrel of a firearm is a major part of arms and represents the pipe, which is welded to the element is reported in the movement in a given direction and at a certain speed.

The device of the trunk due to the appointment of weapons and features of its operation. The barrel as part of the weapon works in the special conditions. To withstand the great pressure of powder gases at high temperature, the friction of the bullets or projectiles during their movement in the barrel and various service loads, the barrel shall be of sufficient strength is ensured by the thickness of its walls and the material is able to withstand high pressure powder gases 250-400 MPa (4,000 kg/cm2) at temperatures up to 3000°C.

Due to the mass manufacture of weapons of particular importance at present is the problem of survivability of the trunks. The question of the survivability of the shafts is extremely important, as currently the trunk is the most short-lived of the critical parts of the weapon. Often the length of service automation in General is ten times more than the persistence of a single trunk. This d�sproperty forces you to pay attention to the issue of survivability trunks serious attention. The main reasons causing wear of the shafts are: pressure and temperature of gases; pressure of the projectile on the side of the thread; the friction of the surface of the channel when the motion of a projectile by rifling (Blagonravov, A. A. Material of small arms. Book 1 - M: Barongis, 1945, pp. 23-41; B. Orlov V. V. Design of missile and cannon systems. - M.: Mashinostroenie, 1974, pp. 323-373; B. V. Orlov, Lerman E. K., Malikov V. G. the Device and designing trunks of artillery. - M.: Mashinostroenie, 1976. - 431 p.).

In search of ways to reduce wear of the channel primarily addressed the use of grades of special steels, providing greater survivability trunks. There are a number of varieties of special steels, sufficiently resistant against wear and tear. Special steel, incorporating such elements as chromium, Nickel, tungsten, give some increased survivability. However, technological difficulties with the use of special steels, in comparison with the insignificance of increasing the survivability of the shafts forced to look for other methods to increase the survivability of the trunks.

These methods include special surface treatment of the channel with the purpose of increasing hardness: for example, the deposition on the surface of the chromium layer, special kinds of cementation of the barrel surface, hardening reported superficial�th metal layer. Thus it is possible to increase the survivability of the trunks are sometimes one and a half times (A. A. Blagonravov Action shot gun barrels. - L.: publishing house of the Artillery Academy of the red army, 1933, page 2-49).

To protect the surface of the bores from atmospheric corrosion is widely used chrome. However, the emergence of white and dark spots, spots, rashes on the surface of the bore in the process of using weapons violates and degrades the performance of the channels of the shafts and arms in General.

A better method for coating the channels of the barrel of a firearm described in patent RU 2338990, F41A 21/22, 20.11.2008, which includes the operation of the preliminary processing of a surface of the channel and the step of applying the coating. The operation of the preliminary processing of a surface of the channel 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 minutes. Then put a layer of multifunctional composition consisting of a mixture of homogeneous and heterogeneous catalysts and dispersion-hardening systems in viscous media. Next, the layer is subjected to heat treatment for 2-4 hours at a temperature of 110-120°C.

In another method of manufacturing a wear-resistant barrel of a firearm carried out the drawing of ultradisperse�th powder or its mixture with the process fluid on the surface of each shell and the inner surface of the barrel before each shot of the series, composed of not less than 3-5 shots, ultrafine powder prepared from natural minerals or a mixture of natural minerals from a number of layered silicates, including various structural modifications of the composition of Mg3[Si2O5](OH)4(EN S, F41A 21/02, F41A 21/22, 20.06.2001).

Known methods allow for formation of anti-friction, wear-resistant and anti-corrosion protective coating of the barrel, however, the coating has a high degree of wear which reduces the lifespan of the barrel.

A method for manufacturing the barrel of automatic firearms, including the production of billets of alloy steel barrel, heat treatment of the workpiece for a given set of mechanical properties, machining the outer and inner surfaces, the formation of the rifled part of the barrel, the formation of the chamber, the deposition on the surface of the bore of chromium by electroplating chrome plating with subsequent heating, for the manufacture of billet trunk use special alloy steels: MS-sh, MF-sh, HA-sh with a carbon content of not higher than 0.3 wt.% and alloying elements, providing a total high position of the critical point AU1then the workpiece is subjected to quenching, wherein the cooling is carried out in the pearlite spacing tempera�with ur speed provides suppression of the process of precipitation of carbides at the grain boundaries of austenite, and for galvanic chromium plating channel use DC current and voltage with ripple current and voltage is not more than 1% of the nominal value (EN 2458157 C1, 10.08.2012). The disadvantage of this method of obtaining stem is the duration of the process as a whole, only in parts chrome plating up to 3 hours, the use of toxic chromium compounds. In addition, in the use of weapons is the cracking and flaking of chrome plating, which reduces the operational characteristics of the weapon.

Thus, all known methods of manufacture of the barrel of the rifle require the use of the material of the barrel steel of high quality with quite thick walls of the pipe barrel, which greatly aggravates the mass of weapons, and the methods of applying the coating to the inner surface of the channel is laborious, time-consuming and not considered as ecologically friendly processes.

An object of the invention is the creation of a fundamentally new method of manufacturing wear-resistant trunk for any type of weapons with lighter weight while maintaining/improving the operational characteristics of the trunks.

The technical result of the invention is the reduced mass of the weapon, reducing the Flexural vibrations of the barrel, �then leads to a uniform distribution in the dispersion of bullets and shooting accuracy, improving the wear resistance of the coating.

The technical result is achieved in that a method of manufacturing the barrel of the weapon is that of a solid workpiece along the length of the barrel from an alloy based on titanium, iron or aluminum is cut along the horizontal axis by at least two parts, bisected in each part of the workpiece recess under the barrel bore, the surface of the recess machine, then on the prepared surface coated by the method of argon-arc welding in combination with samariterstrasse high-temperature synthesis, wherein the non-consumable electrode using tungsten-rhenium, as the welding electrode into the arc zone serves the electrode is pressed from an exothermic mixture of powders of titanium with boron and/or carbon at a weight ratio of boron or carbon to titanium ratio of 1:15-30, in the process of deposition of the exothermic reaction mixture develops self-propagating high temperature synthesis (SHS), the products of synthesis which are melted in the arc and flow to the surface of the recess, forming a coating in the form of welding, after welding is carried out finishing horizontal surfaces of the workpieces and surfaces surfacing of the recess to the desired caliber of the barrel, the connection of the processed portions of the workpiece between them in the trunk is�straut on the outer surface is wound with tension layers of high-strength steel wire or tape, or ribbon of carbon fiber.

The method consists in the following.

For the manufacture of the barrel take a blank of circular cross-section, the diameter and length of which depend on future barrel length and caliber. Workpiece is cut by at least two parts along the horizontal axis. The trunks of small and medium diameter of the workpiece is cut into two parts, the barrel above 25 mm in three or more parts. As the material of the workpiece trunk use the alloys based on titanium with high heat resistance and high strength, for example, mark W 6 (GOST 19807-74); alloys based on iron, for example, stamps 36 H (Invar) containing 35-37% Nickel, 32 brand ACY (superinvar), 29 NC (Kovar); high-strength alloys based on aluminum: alloys of 65, 95 and 96, in the composition of these alloys include copper, zinc and other alloying elements on the strength of these alloys of aluminum above low-alloy steels.

The workpiece can be supplied according to customer requirements or are made from solid steel. Solid billet of the material on the size of the trunk is cut along the horizontal axis by at least two parts, bisected in each part of the workpiece recess under the barrel bore, the surface of deepening sanded, then on the prepared surface coated by the method of argon-arc surfacing with�etani with samariterstrasse high-temperature synthesis (SHS arc surfacing), which is described in the article (Quanin V. L., Balikhin N. T., Merzhanov A. G., Karasahin V. G. "the Use of self-propagating high temperature synthesis and argon-arc welding by work hardening the surface of titanium alloys", Izv. Non-ferrous metallurgy, No. 2, 2012, pp. 46-52).

The surfacing is applied to the inner surface of the recessed channel of all parts of the workpieces, which workpieces are placed on the table, which moves along the channel axis in a chamber in an argon atmosphere. In the chamber establish a non-consumable tungsten-rhenium electrode, excite an arc between it and the coated surface of the recess of the barrel blanks, then served in the zone of the arc welding electrode of compressed exothermic mixture of powders of the starting components of titanium with boron and/or carbon at a weight ratio of boron or carbon to titanium ratio of 1:15-30. In the process of deposition of the exothermic reaction mixture develops self-propagating high temperature synthesis, the hot products of synthesis are melted in the arc and flow to the surface of the recess of the blanks of the trunk, forming a coating in the form of cladding, the thickness of which, depending on the caliber ranges from 0.5 to 15 mm.

As a result of deposition on the surface of the grooves under the channel layer is formed of a coating of composite mater�Ala based on titanium, hardened solid particles monoboride and/or titanium carbide. After surfacing the workpiece barrel optionally can be subjected to heat treatment in a special mode, depending on caliber, barrel material and composition of the hardfacing. Mechanical surface treatment, surfacing and horizontal surfaces of the workpieces is carried out, for example, diamond grinding to the desired caliber of the barrel. Then the final part of the interconnected blanks in barrel shape and strengthen them on the outer surface of the barrel wound with tension layers of high-strength steel tape or wire, or a ribbon of carbon fiber.

As high-strength steel wire and tape use a steel with a tensile strength not lower than 1800÷2000 MPa and high resistance to brittle fracture.

As the carbon fiber they use materials like Kevlar, carbon fiber, for example, the German company "Graphite PRO".

The connection of the workpieces in the barrel with the use of coiling with tension reduces the Flexural vibrations of the barrel, which leads to a uniform distribution in the dispersion of bullets. The advantage of winding in combination with the coating of the barrel is the exclusion of accidental rupture of the barrel as a result of high pressure powder gases released because there is a stepwise decrease in pressure.

The essence of Fig�plants is illustrated by Fig. 1-4: Fig.1 shows the time of cutting the recessed channel cutter, where 1 is the solid side of the trunk, 2 - pocket under the channel prior to coating, 3 - horizontal workpiece surface of the barrel; Fig.2 shows the time of surfacing, where 4 - welding electrode, 5 - non-consumable tungsten-rhenium electrode 6 is coated on the surface of the recess prior to processing grinding diamond wheel; Fig.3 shows the moment of processing diamond grinding wheel coatings, where 7 - the finished coating on the workpiece; Fig.4 is a view of the finished barrel in two parts, connected by a steel multi-layer tape 8, the cover 9 and the channel 10, the F - direction.

Summary of the invention examples.

Example 1

Manufacture of machine-gun of 7.62 mm. the Solid material according to the length of the trunk from a titanium alloy W 6 strength (150-180 kg/mm) is cut into two parts 1 along the horizontal axis, are cut in each of the parts of the workpieces 2 deepening under the channel, the surface of the recess is polished, the prepared surface, apply the coating by the method of argon-arc welding in combination with samariterstrasse high-temperature synthesis, in which the non-consumable electrode 5 is used tungsten-rhenium, in the zone of the arc serving welding electrode 4 of the pressed esotericas�Oh a mixture of titanium and boron in the ratio of boron to titanium of 1:15. In the process of deposition of the exothermic reaction mixture develops self-propagating high temperature synthesis and hot products of synthesis in the form of a composite material based on titanium and monoboride titanium are melted in the arc and flow to the surface of the recess and form them cast coating 6 after surfacing billet trunk annealed at 500°C for 3 hours, then subjected to a mechanical surface treatment, surfacing and horizontal surfaces of workpieces by grinding by diamond wheel to a size of 7.62 mm, Connection prepared two blanks between them in the form of the trunk is carried out by winding with interference layers of high-strength steel wire or tape 8 in 4 rows on the outer surface of the barrel with the formation of the channel 10 of the barrel. A General view is obtained of the barrel shown in Fig.4, where 9 is the appearance of the finished coating on the workpiece with the winding.

Wear a coating thickness of 0.5 mm is 61 μm/h, the limit of the bending strength of 750 MPa, tensile compressive strength of 2400 MPa, a hardness of 76 HRA.

Preliminary tests of the gun with the received trunk showed that when the initial accuracy of the battle 8.5 cm after a series of 10 shots it is no worse than 4.5 cm and persists after more than 1000 shots. Such operating data meet the requirements of GOST.

Example 2

And�the manufacture of duralumin barrel for small arms caliber 5.5 mm. All as in example 1, but after overlaying billet trunk not annealed, and a winding carried by a ribbon of carbon fiber (carbon) in 3 rows, and the exothermic mixture of titanium and carbon (graphite) at a ratio of graphite to titanium of 1:20. Wear a coating of 0.5 mm thickness is 50 μm/h, the limit of the bending strength of 650 MPa, tensile compressive strength of 2450 MPa, hardness 86 HRA.

Performance characteristics of weapons using the gun close to the data of example 1.

Example 3

Manufacturer of barrel length 2 m for tank T-90 caliber 125 mm. a blank for the barrel of the iron-based alloy brand 36 H (Invar) is cut along a horizontal axis into 4 parts. Next, as in example 1, but as an exothermic mixture of powders of boron and titanium during their mass ratio of 1:30, and the connection is prepared 4-piece blanks between them in the trunk is carried out by winding with interference layers of high-strength steel wire in 5 rows on the outer surface of the barrel. The coating thickness of 15 mm. Wear of the coating is 30 microns/h, the limit of the bending strength of 850 MPa, tensile compressive strength of 2850 MPa, hardness 88 HRA.

From the gun, fitted with obtained the trunk, made 5 test shots to determine the accuracy of the battle and range. After a series of 10 shots the accuracy of the battle uluchshilas� 2.0 times, the projectile range increased by 2.5 times. The achieved performance accuracy and range remained after 1000 shots.

Example 4

Manufacture of machine-gun of 7.62 mm., All as in example 1, but the two parts of the barrel blank made from high-strength alloy based on aluminum grade 65, welding electrode is made of titanium and boron in the ratio of boron to titanium of 1:20 and titanium with carbon in the ratio of carbon to titanium of 1:10. and the connection of the workpieces in the barrel hold the tape carbon tape (carbon) in 4 rows with tension.

The coating thickness is 1.0 mm. the Wear of the coating is 40 μm/h, the limit of the bending strength of 800 MPa, tensile compressive strength of 2800 MPa, hardness 86 HRA.

The achieved performance accuracy and range correspond to the data of example 3.

The examples do not limit the ability of the proposed method and experts in the field of SHS and weapons can try out other variants of the proposed method.

Thus, the claimed combination of features allows to obtain a gun barrel with wear of the coating depending on the thickness of the cladding is not more than 65 μm/h; the coefficient of erosion resistance of the coating of about 4.3×10-12km/h, hardness up to 90 HRA, tensile strength in bending to 850 MPa, a tensile strength in compression to 2800 MPa, which far exceeds EN�logical data known for coverings of trunks. Such properties of the coating ensure the vitality of barrels in three and more times, improve accuracy by increasing the accuracy of manufacture of the channel, improve the distribution of bullets from firearms, reduce the uneven distribution when the dispersion of bullets, improve the accuracy of the battle.

Furthermore, the method simplifies the manufacturing technology of trunks, and stems, is made according to the invention from alloys based on titanium or aluminum and has a weight 30-50% lower than steel, which in turn reduces the overall weight of the weapon.

A method of manufacturing a gun barrel, whereby a solid material according to the length of the barrel from an alloy based on titanium, iron or aluminum is cut along the horizontal axis by at least two parts, bisected in each part of the workpiece recess under the barrel bore, the surface of the recess machine, then on the prepared surface coated by the method of argon-arc welding in combination with samariterstrasse high-temperature synthesis, wherein the non-consumable electrode using tungsten-rhenium, as the welding electrode into the arc zone serves the electrode is pressed from an exothermic mixture of powders of titanium with boron and/or carbon at a weight ratio of boron or carbon to titanium ratio of 1:1-30, in the process of deposition of the exothermic reaction mixture develops self-propagating high temperature synthesis, synthesis products which are melted in the arc and flow to the surface of the recess, forming a coating in the form of welding, after welding is carried out finishing horizontal surfaces of the workpieces and surfaces surfacing of the recess to the desired caliber of the barrel, the connection of the processed portions of the workpiece between a barrel carried on the outer surface is wound with tension layers of high-strength steel wire or ribbon, or tape of carbon fiber.



 

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