KR20200035922A - Frangible bullet and frangible projectiles comprising the same - Google Patents

Abstract

The present invention relates to a frangible bullet which is configured to disintegrate upon target impact to prevent damage while satisfying physical properties as a frangible bullet, and a frangible cartridge comprising the same. According to the present invention, the frangible bullet is manufactured using bronze powder to have a middle part, a front end part, and a rear end part, wherein the bronze powder comprises 91.49-93.5 wt% of copper (Cu), 6.48-8.49 wt% of tin (Sn), 0.009-0.017 wt% of iron (Fe), 0.002 wt% of nickel (Ni), 0.0003 wt% of aluminum, 0.002-0.003 wt% of zinc, 0.0001 wt% of magnesium, and 0.0009 wt% of lead (Pb).

Description

A crushing bullet and a crushing bullet containing the same TECHNICAL FIELD {FRANGIBLE BULLET AND FRANGIBLE PROJECTILES COMPRISING THE SAME}

The present invention provides a shredded charcoal prepared by using a bronze powder, but is manufactured by a powder metallurgy method or a metal injection molding method so as to have a generally cylindrical shape and a front end having a conical shape, while satisfying the properties as a shattered charred target The present invention relates to a crushed bullet that can be crushed so as not to cause damage by a bullet when colliding with a crushed bullet, and a crushed bullet including the same.

As is well known, crushed grenade means a bullet that is crushed into small particles after the fired crushed bullet hits the target to prevent the bullet.

This shredded grenade was developed from a study of safe ammunition that was not damaged by the munition as a result of casualties in the 1900s at an amusement park shooting range in the United States.

In addition, crushed grenade can be used for operations and battles carried out in urban areas, airplane interiors, nuclear facilities, and firepower facilities where facilities and equipment need to be protected during military operations. Can be used to prevent car damage.

The crushing mechanism of the crushing grenade as described above, when the stress is removed, the deformed object returns to its original state, the elastic behavior that follows Hooke's law, and the plastic undergoes permanent deformation when the stress is applied. Plastic behavior, brittle fracture in which the material is destroyed with little plastic behavior by external force, etc. can be considered.

In particular, brittle fracture of the crushed coal may generally occur due to non-uniformity of the structure and material, and when the crushed carbon bombards the target, the ruptured carbon may be crushed by generating fuss due to pores present in the material.

As described above, there is a need for continuous research and development on crushed bullets that do not cause damage due to grenade and crushed bullets containing the same.

Korean Registered Patent No. 10-0146673 (registered on May 12, 1998)

The present invention provides a crushed charcoal produced using a bronze powder, but by manufacturing a powder metallurgy method or a metal injection molding method to have a generally cylindrical shape and a front end having a conical shape, colliding with a target while satisfying physical properties as a crushed charcoal It is intended to provide a crushed bullet that can be crushed so as not to cause damage by a city munition and a crushed coal containing the same.

In addition, the present invention is manufactured by using a bronze powder containing copper (Cu) and tin (Sn) to produce shredded charcoal, but in the case of powder metallurgy, the bronze powder is manufactured to have a size range of 140-325 mesh. , By heat treatment in a nitrogen atmosphere at a temperature range of 260-400 ℃, and in the case of metal injection molding, at least 625 mesh or more of bronze powder is treated without injection and degreasing after sintering, so that economical and harmful effects of metal elements can be considered. In addition, it is intended to provide a crushing bullet that can be manufactured to have a proper kinetic energy and a weight capable of generating pressure for smooth gun operation, and a crushing coal containing the same.

The objectives of the embodiments of the present invention are not limited to those mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description. .

In order to solve the above problems, the present invention is manufactured using bronze powder, and is in a cylindrical shape with a diameter of 5.5 to 6.0 mm, gradually inclined inward so that the radius of curvature becomes 45 to 50 mm from the center to the front end. In the form having a middle end portion, a front end portion of a conical shape with an inner angle of 85 to 95 degrees at the front end, and a rear end portion formed to extend by a length of 8.5 to 9.0 mm at an inclination angle of 45 to 55 degrees from the rear end of the middle portion Prepared, the bronze powder, copper (Cu) 91.49-93.5 wt%, tin (Sn) 6.48-8.49 wt%, iron (Fe) 0.009-0.017 wt%, nickel (Ni) 0.002 wt%, aluminum 0.0003 wt% , 0.002-0.003% by weight of zinc, 0.0001% by weight of magnesium, 0.0009% by weight of lead (Pb), and the crushed charcoal is manufactured by a metal injection molding method, wherein the crushed charcoal is at least 625 mesh. Having the above bronze powder After mixing with a binder to prepare a mixture, the desired shape is prepared through an injection molding process, and the sintering is not performed by removing the binder, so that paraffin wax used as the binder can be melted. Solvent containing acetone for removing the mixed binder by mixing the bronze powder and binder uniformly using a mixer by applying a temperature of -220 ℃, and injecting it from a mold to process the mixed material into a product shape. Or degreasing in a nitrogen atmosphere or a hydrogen atmosphere at a temperature of about 280-320 ° C., the crushed charcoal produced by the above process has a hardness of 66 to 91 Hv, and is easily destroyed in the target collision of the crushed charcoal. It is possible to provide crushed bullets that are crushed to prevent damage by a bullet.

In addition, in order to solve the above problems, the present invention provides a crushing bullet, a crushing casing coupled to the crushing bullet, and a propellant which is filled in the crushing casing and provides combustion heat while firing the crushing bullet through combustion, It is provided at the rear end of the crushed casing and includes a primer that explodes through an impact applied from the rear to burn the propellant, wherein the crushed charcoal is manufactured using bronze powder, and is centered in a cylindrical shape with a diameter of 5.5 to 6.0 mm. From the part to the front end portion, the middle end portion is inclined gently inward so that the radius of curvature is 45 to 50 mm, the front end portion of a conical shape with an inner angle of 85 to 95 degrees at the front end of the tip, and 45 at the rear end of the middle portion It is manufactured in a form having a rear end portion extending to a length of 8.5 to 9.0 mm at an inclination angle of 55 degrees, and the bronze powder Mean: Copper (Cu) 91.49-93.5 wt%, Tin (Sn) 6.48-8.49 wt%, Iron (Fe) 0.009-0.017 wt%, Nickel (Ni) 0.002 wt%, Aluminum 0.0003 wt%, Zinc 0.002-0.003 Weight%, 0.0001% by weight of magnesium, 0.0009% by weight of lead (Pb), the crushed charcoal is produced by a metal injection molding method, and the crushed charcoal is at least 625 mesh (mesh) in the size range of the bronze powder After mixing with a binder to prepare a mixture, the desired shape is prepared through an injection molding process, and the sintering is not performed by removing the binder, so that paraffin wax used as the binder can be melted. The bronze powder and the binder are uniformly mixed using a mixer by applying a temperature of -220 ° C, and the mixed material is injected from a mold to process the product shape, and acetone is included to remove the mixed binder. The solvent is used, or degreased in a nitrogen atmosphere or a hydrogen atmosphere at a temperature of about 280-320 ° C, and the crushed charcoal prepared by the above process has a hardness of 66 to 91 Hv, and is destroyed upon target collision of the crushed charcoal It is easy to provide a crushed grenade that is crushed to prevent damage caused by the grenade.

The present invention provides a crushed charcoal produced using a bronze powder, but by manufacturing a powder metallurgy method or a metal injection molding method to have a generally cylindrical shape and a front end having a conical shape, colliding with a target while satisfying physical properties as a crushed charcoal City grenade can be crushed to prevent damage.

In addition, the present invention is to produce a crushed coal by using a bronze powder containing copper (Cu) and tin (Sn), in the case of powder metallurgy, the bronze powder is manufactured to have a size range of 140-325 mesh (mesh), Heat treatment in a nitrogen atmosphere in a temperature range of 260-400 ° C, and in the case of the metal injection molding method, at least 625 mesh or more of bronze powder is treated without injection and degreasing and then sintered, so that economical and harmful effects of metal elements can be considered. In addition, it can be manufactured to have a proper kinetic energy and a weight capable of generating pressure for smooth gun operation.

1 is a view illustrating a shredded bullet according to an embodiment of the present invention,
2a to 2e are views for explaining the shape and material of the shredded bullet according to an embodiment of the present invention,
3 is a view for explaining a powder metallurgy method of manufacturing a shredded charcoal according to an embodiment of the present invention,
4 is a view for explaining a metal injection molding method for manufacturing a shredded bullet according to an embodiment of the present invention,
5 is a view illustrating a crushed coal according to another embodiment of the present invention,
6 is a view for explaining the crushing performance of the crushed coal according to another embodiment of the present invention.

Advantages and features of embodiments of the present invention, and methods of achieving them will be apparent with reference to embodiments described below in detail along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to completely inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

In describing embodiments of the present invention, when it is determined that a detailed description of known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view illustrating a crushing bullet according to an embodiment of the present invention, FIGS. 2a to 2e are views for explaining the shape and material of the crushing bullet according to an embodiment of the present invention, and FIG. FIG. 4 is a view for explaining a powder metallurgy method for manufacturing shredded charcoal according to an embodiment of the present invention, and FIG. 4 is a diagram for explaining a metal injection molding method for manufacturing shredded charcoal according to an embodiment of the present invention.

1, 2A to 2E, 3, and 4, the shredded charcoal 100 according to an embodiment of the present invention is manufactured using bronze powder, and has a cylindrical middle portion 120, The front end portion 110 has a conical shape, and the rear end portion 130 may be manufactured in an inclined shape in which the diameter decreases toward the rear.

The shredded charcoal 100 may be provided with a front end portion 110, a middle end portion 120, and a rear end portion 130 in order from front to rear, and the middle end portion 120 has a cylindrical diameter of approximately 5.5-6.0 mm. As it is different from the center portion to the front end portion 110, it may have a gently inwardly inclined shape (the radius of curvature is approximately 45-50 mm), and the front end portion 110 may be provided at the front end of the middle portion 120. While having a diameter of approximately 3.5-4.0 mm, the inner angle (a) at the apex of the shear may have a range of approximately 85-95 degrees, and the rear end 130 has an inclination angle (b) at the rear end of the middle portion 110 ) May be formed to be inclined inward in a range of approximately 45-55 degrees, and may be extended by a length of approximately 8.5-9.0 mm.

The crushed charcoal 100 as described above may have a weight range of approximately 2.8-3.4 g. The bronze powder used to manufacture the crushed charcoal 100 includes 85-95% by weight of copper (Cu) and tin (Sn). ) 5-15% by weight. Specifically, as shown in Figure 2b, the bronze powder is copper (Cu) 91.49-93.5 wt%, tin (Sn) 6.48-8.49 wt%, iron (Fe) 0.009-0.017 wt%, nickel (Ni) 0.002 wt% , 0.0003% by weight of aluminum, 0.002-0.003% by weight of zinc, 0.0001% by weight of magnesium, and 0.0009% by weight of lead (Pb).

Here, since the crushed charcoal 100 uses a material having a low specific gravity, it is difficult to generate a target level of kinetic energy and pressure for a smooth gun operation due to a lack of weight in a desired shape. If considered, copper (Cu, specific gravity of 8.96 as shown in FIG. 2A) is most suitable, and tin (Sn, specific gravity of 7.3 as shown in FIG. 2A) in order to satisfy physical properties as the shredded charcoal 100. Can be further mixed.

The crushed charcoal 100 as described above may be manufactured by using powder metallurgy (PM) or metal injection molding (MIM) using bronze powder.

Here, in the case of the powder metallurgy method, as shown in FIG. 3, pressure is applied to metal powders to form a desired shape (Mixing, Compaction), and the mixed molded body is heated at a temperature equal to or higher than the melting point of the binder. By forming a bronze powder having a size range of 140-325 mesh, including copper (Cu) and tin (Sn), as a method of producing a product having a desired shape and physical properties, and then After the molding mixture is compressed by a press, heat treatment is performed in a nitrogen atmosphere at a temperature range of 260-400 ° C. to produce a shredded charcoal 100 according to an embodiment of the present invention.

Through the powder metallurgy manufacturing technique, it is possible to manufacture the shredded charcoal 100 of a complicated shape by a simple process, and can be manufactured at a lower temperature than casting, and uniformly control the mixing of the metal powder to obtain a uniform material. It has the advantage of being able to manufacture the shredded charcoal 100 and to produce a porous material in a relatively easy process.

On the other hand, in the case of the metal injection molding method, as shown in FIG. 4, a molding technique combining the advantages of plastic injection molding and powder metallurgy, including at least 625 mesh, including copper (Cu) and tin (Sn). After preparing a mixture by mixing the bronze powder with the above size range with a binder, manufacture the desired shape through the injection molding process (Granulation, Feed stock, Injection molding, Green part) Then, after removing the binder (Solvent debinding, Thermal debinding), it is possible to manufacture the crushed charcoal 100 as a metal molded product without sintering.

For example, a mixture of a binder and a metal (ie, bronze powder) is uniformly mixed by applying a temperature of approximately 200-220 ° C. to melt the paraffin wax, which is a resin, for mixing the resin-based binder and the metal powder using a mixer. And, the mixed material is injected from a mold to process the product shape, and a solvent such as acetone may be used to remove the resin-based binder, or it may be degreased at a temperature of about 280-320 ° C. with a nitrogen atmosphere or a hydrogen atmosphere.

Here, in the manufacturing process of the metal injection molding method, sintering is not performed for easy destruction upon target collision of the crushed charcoal, so that the required level of hardness can be maintained.

Through such a metal injection molding manufacturing technique, it is possible to manufacture a crushed charcoal 100 of a complex shape, and improve the defect of powder flowability by adding an organic binder, and regenerate the injection-molded mixture as required. There are advantages.

When analyzing the physical properties of the shredded bullet 100 prepared as described above with reference to FIGS. 2B to 2E, in the case of component analysis using the SEM (Scanning Electron Microscope) among the physical properties for the prepared broken bullet samples, FIG. 2B As shown, it can be seen that while the main components are copper (Cu) and tin (Sn), metal components such as iron, nickel, aluminum, lead, zinc, and magnesium may be contained in trace amounts.

That is, the crushed charcoal can be manufactured by a metal injection molding method with a bronze powder, and as shown in FIG. 2B, the bronze powder is copper (Cu) 91.49-93.5 wt%, tin (Sn) 6.48-8.49 wt%, iron (Fe) 0.009-0.017 wt%, nickel (Ni) 0.002 wt%, aluminum 0.0003 wt%, zinc 0.002-0.003 wt%, magnesium 0.0001 wt%, lead (Pb) may include 0.0009 wt%. In addition, as shown in Figure 2c, it can be seen that the crushed charcoal containing the bronze powder has a density of 6.44 g / cm ³ , a mass of 2.99 g, a volume of 0.45 cm ³ , and a porosity of 26.8%.

In addition, the crushed charcoal produced by the above process may have a hardness of 66 to 91 Hv. For example, as shown in FIG. 2D, the hardness of the crushed charcoal samples is 85 Hv at the middle surface at the point 16 mm from the rear end surface, 71 Hv at the cross section at 8 mm, and the surface hardness at the point at 4 mm. It can be seen that is 76 Hv.

Also, as shown in FIG. 2E, it can be seen that the fracture load of the crushed bullet samples is 681 kgf in the longitudinal direction, and 1344 kgf in the transverse direction.

That is, as described above, it can be seen that the shredded charcoal 100 manufactured according to one embodiment of the present invention satisfies the physical properties as the shredded charcoal.

Therefore, the present invention provides a crushed charcoal produced using a bronze powder, and is manufactured by a powder metallurgy method or a metal injection molding method such that it has a generally cylindrical shape and a front end having a conical shape, while satisfying the physical properties as a crushed charcoal. Can be crushed so as not to cause damage by a bullet in the collision.

In addition, the present invention is manufactured by using a bronze powder containing copper (Cu) and tin (Sn) to produce shredded charcoal, but in the case of powder metallurgy, the bronze powder is manufactured to have a size range of 140-325 mesh. , By heat treatment in a nitrogen atmosphere at a temperature range of 260-400 ℃, and in the case of metal injection molding, at least 625 mesh or more of bronze powder is treated without injection and degreasing after sintering, so that economical and harmful effects of metal elements can be considered. In addition, it can be manufactured to have a proper kinetic energy and a weight capable of generating pressure for smooth gun operation.

Next, a crushed bullet including a crushed bullet having a structure as described above, a crushed shell including a propellant filled inside the crushed shell, and a primer for burning the propellant will be described in detail.

5 is a view illustrating a crushing coal according to another embodiment of the present invention, FIGS. 6A to 6E are views for explaining the crushing performance of the crushing coal according to another embodiment of the present invention.

5, 6A to 6E, the shredding bomb 200 according to another embodiment of the present invention includes a shredding bullet 100, a shredding shell 210, a propellant 220, a primer 230, etc. can do. Here, since the crushed bullet 100 has been described in detail in one embodiment of the present invention, a detailed description thereof will be omitted below.

The crushing casing 210 is combined in a form surrounding the rear end of the crushing charcoal 100, and may be made of a material such as a gilding metal clad steel sheet (GMCS), a gilding metal (GM), and the crushing charcoal 100. In order to be coupled, the front end may have an open shape, and may be coupled to the rear end of the shredded charcoal 100.

The propellant 220 is filled in the crushed casing 210 and provides combustion heat while firing the crushed charcoal 100 through combustion, and is burned through heat generated through the primer 230, thereby using the combustion gas By firing the shredded charcoal 100 coupled to the front end of the shredded casing 210, the generated combustion heat can be transferred to the bottom cover 160 of the shredded charcoal 100.

Primer 230 is provided at the rear end of the crushed casing 210 to explode through the impact applied from the rear to burn the propellant 220, to explode with the impact applied through the gun of the firearm to burn the propellant 220 You can.

When specifically describing the crushing performance of the crushed grenade as described above, the distance is 3 m, the target material is an armor plate, the target thickness is 9.5 mm, the target angle is 0 degrees, the size of the collection box Has a size of 12 * 12 * 12 or more, the material of the top, bottom, left, and right sides of the collection box is steel, the front material of the collection box is corrugated cardboard, and the judgment of whether or not to fracture is considered.

In addition, the bullet speed was fired in the range of 2,800-2900 ft / s, and a rupture bullet of 5.56 mm was fired and measured at a point of 3 m muzzle.

As a result of the crushing test and measurement as described above, the crushed pieces as shown in FIG. 6 could be recovered.

Therefore, the present invention provides a crushed charcoal produced using a bronze powder, and is manufactured by a powder metallurgy method or a metal injection molding method such that it has a generally cylindrical shape and a front end having a conical shape, while satisfying the physical properties as a crushed charcoal. It is possible to provide a crushed grenade that can be crushed so as not to cause damage by a bullet in the collision of.

In the above description, various embodiments of the present invention have been presented and described, but the present invention is not necessarily limited thereto, and a person having ordinary knowledge in the technical field to which the present invention pertains may depart from the technical spirit of the present invention. It will be readily apparent that branch substitution, modification and modification are possible.

100: shredded bullet
200: shred
210: shredded casing
220: propellant
230: primer

Claims (2)

It is manufactured using bronze powder, and has a cylindrical shape with a diameter of 5.5 to 6.0 mm. The middle portion is inclined gently inward so that the radius of curvature is 45 to 50 mm from the center to the front end, and the inside at the tip of the shear. It is manufactured in a form having a conical front end having an angle of 85 to 95 degrees, and a rear end extending at a length of 8.5 to 9.0 mm at an inclination angle of 45 to 55 degrees from the rear end of the middle end,
The bronze powder is copper (Cu) 91.49-93.5 wt%, tin (Sn) 6.48-8.49 wt%, iron (Fe) 0.009-0.017 wt%, nickel (Ni) 0.002 wt%, aluminum 0.0003 wt%, zinc 0.002 -0.003% by weight, 0.0001% by weight of magnesium, 0.0009% by weight of lead (Pb), the crushed charcoal is manufactured by a metal injection molding method,
The crushed charcoal is prepared by mixing the bronze powder having a size range of at least 625 mesh with a binder to prepare a mixture, and then preparing a desired shape through an injection molding process and removing the binder. Sintering does not proceed,
The bronze powder and the binder are uniformly mixed using a mixer by applying a temperature of 200-220 ° C. so that the paraffin wax used as the binder can be melted, and the mixed material is injected from a mold to process the product shape. To remove the mixed binder, a solvent containing acetone is used, or degreased in a nitrogen atmosphere or a hydrogen atmosphere at a temperature of about 280-320 ° C,
The crushed charcoal produced by the above process has a hardness of 66 to 91 Hv, and is easily destroyed when the target collides with the crushed charcoal, so that the crushed charcoal is crushed to prevent damage due to the charcoal.
Crushed bullets,
A crushed casing coupled to the crushed bullet,
A propellant filled in the crushed casing and providing combustion heat while firing the crushed bullet through combustion;
It is provided at the rear end of the crushed casing includes a primer that explodes through an impact applied from the rear to burn the propellant,
The shredded bullet
It is manufactured using bronze powder, and has a cylindrical shape with a diameter of 5.5 to 6.0 mm. The middle portion is inclined gently inward so that the radius of curvature is 45 to 50 mm from the center to the front end, and the inside at the tip of the shear. It is manufactured in a form having a conical front end having an angle of 85 to 95 degrees, and a rear end extending at a length of 8.5 to 9.0 mm at an inclination angle of 45 to 55 degrees from the rear end of the middle end,
The bronze powder is copper (Cu) 91.49-93.5 wt%, tin (Sn) 6.48-8.49 wt%, iron (Fe) 0.009-0.017 wt%, nickel (Ni) 0.002 wt%, aluminum 0.0003 wt%, zinc 0.002 -0.003% by weight, 0.0001% by weight of magnesium, 0.0009% by weight of lead (Pb), the crushed charcoal is manufactured by a metal injection molding method,
The crushed charcoal is prepared by mixing the bronze powder having a size range of at least 625 mesh with a binder to prepare a mixture, and then preparing a desired shape through an injection molding process and removing the binder. Sintering does not proceed,
The bronze powder and the binder are uniformly mixed using a mixer by applying a temperature of 200-220 ° C. so that the paraffin wax used as the binder can be melted, and the mixed material is injected from a mold to process the product shape. To remove the mixed binder, a solvent containing acetone is used, or degreased in a nitrogen atmosphere or a hydrogen atmosphere at a temperature of about 280-320 ° C,
The crushed charcoal produced by the above process has a hardness of 66 to 91 Hv,
A crushed grenade that is easily destroyed when a target collides with the crushed bullet and is prevented from being damaged by a bullet.

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