KR101350718B1 - Fragmentation assembly and Target-practice projectile having the same - Google Patents

Abstract

The shredding body is applied to the body in which the flight is made by the explosive force of the propellant charge, the shredding body is broken by the collision energy generated by the collision with the target body; And a notch portion formed to have a recessed structure in the shredding body such that the shredding characteristic due to the collision energy is increased and finely shredded when the shredding body is shredded, and the training bullet may have the shredded body mentioned above. .

Description

Fragmentation assembly and Target-practice projectile having the same}

The present invention relates to a crushed body and a training bullet having the same, and more particularly, to a crushed body formed to have the same conditions as the actual coal and a practiced bullet having the same.

Practice bullets have almost the same trajectory as real bullets to improve your efficiency. Thus, the training bullet is manufactured in almost the same conditions as the actual bullet in appearance, structure, weight and the like. An example of the practice bullet mentioned is disclosed in Korean Patent Application No. 2007-55581 (hereinafter referred to as 'quoting literature').

However, as disclosed in the cited document, the practice bullet provided with the metal body has a problem that the fragments of the practice bullet can be scattered to a far distance when colliding with the target to cause damage to the public. Here, the distance from which the fragments of the training bullets are scattered is proportional to the weight of the fragments, because the fragments are somewhat largely broken when the training coals are provided only with the metal body and collide with the target.

It is an object of the present invention to provide a crushing body and a practice bullet having the same, which can shorten the distance from which fragments are scattered by finer crushing.

Crushing body according to an embodiment of the present invention for achieving the above-mentioned object is applied to the carcass is flying by the explosive force of the propelling charge, the crushing body is crushed by the collision energy generated by the collision with the target; And a notch portion formed to have a recessed structure in the shredding body such that the shredding characteristic due to the collision energy is increased when the shredding body is shredded and thus shredded finely.

In the crushed body according to one embodiment of the present invention mentioned above, the crushed body may be made of a metal sintered body, ceramic, polymer material, or a mixture thereof including at least one kind of metal.

In the shredding body according to the embodiment of the present invention mentioned above, the shredding body may be formed of a tubular structure having one side open, a tubular structure having a through hole, or a hollow tubular structure.

In the crushing body according to one embodiment of the present invention, at least two notches may be formed along the circumference of the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body.

In the crushing body according to one embodiment of the present invention, the notches are formed at least two spaced apart in the direction perpendicular to the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body, or At least two of the outer surface, the inner surface, or the oblique direction of the outer surface and the inner surface of the crushing body are formed at an interval, or along the circumference of the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body. It may be formed in a spiral direction, or may be formed in a grid pattern on the outer surface, the inner surface, or the outer surface and the inner surface of the crushed body.

In the crushing body according to the embodiment of the present invention, the pressure is applied to the crushing body in which the notch is formed by the collision energy generated when the carbon collides with the target, thereby finely crushing the crushing body in which the notch is formed. It may further include a pressure-resistant case for receiving the fracture body formed with the notch.

Exercise bullet according to an embodiment of the present invention for achieving the above-mentioned object is a body made of flying by the explosive force of the propellant charge; And a crushing body accommodated in the body to adjust the weight of the body and crushed by the collision energy generated when the body collides with a target by the explosive force of the propelling charge, and when the crushing body is crushed by the collision energy. The crushing body may include a crushing body having a notch formed to have a structure in which the crushing body is increased to finely crush the crushing body.

In the practice bullet according to the embodiment of the present invention, the notch may be formed at least two intervals along the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body.

In the practice bullet according to the embodiment of the present invention mentioned above, the notch is formed at least two intervals in a direction perpendicular to the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body, or At least two of the outer surface, the inner surface, or the oblique direction of the outer surface and the inner surface of the crushing body are formed at an interval, or along the circumference of the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body. It may be formed in a spiral direction, or may be formed in a grid pattern on the outer surface, the inner surface, or the outer surface and the inner surface of the crushed body.

As such, the shredding body according to the present invention forms a notch for increasing the shredding characteristics in the shredding body, so that the shredding body is more finely shredded when the shredding body is shredded by colliding with the target. Thus, by providing a pulverized body having a crushed body in which the notch is formed so that the finer crushed in the training bullet, the fragments can be sufficiently prevented from scattering at a far distance during the shooting training using the training bullet.

Therefore, in the case of the crushing body and the training bullet having the same according to the present invention, since the fragments are scattered only within a short distance, it is possible to sufficiently prevent people's damage caused by the fragments scattered to a far distance in advance.

1 is a schematic perspective view showing a crushing body according to an embodiment of the present invention.
2 is a cross-sectional view of Fig.
3 is a schematic cross-sectional view showing a crushing body according to another embodiment of the present invention.
4 is a schematic cross-sectional view showing a crusher according to another embodiment of the present invention.
5 is a schematic view showing a crushing body further comprising a pressure resistant case.
Figure 6 is a schematic diagram showing a training bullet according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described with respect to the crushing body according to an embodiment of the present invention and a training bullet having the same. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. In describing the drawings, similar reference numerals are used for similar components. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the invention, and are actually shown in a smaller scale than the actual dimensions in order to explain the schematic configuration. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Example

1 is a schematic perspective view showing a crushing body according to an embodiment of the present invention, Figure 2 is a cross-sectional view of FIG.

1 and 2, the shredding body 10 is accommodated in the body of the training bullet, which will be described later, and may include a shredding body 11 and a notch 13.

Specifically, the crushing body 11 is a member accommodated in the body as mentioned to be applied to the body in which the flight is made by the explosive force of the propelling charge. And the notch 13 is formed to have a structure dug in the shredding body (11). In other words, the notch 13 has a structure that increases the fracture characteristics due to the collision energy when the fracture body 11 is fractured. This is because the crushed body 11 portion in which the notch 13 is formed has a thinner thickness than other portions of the crushed body 11 in which the notched portion 13 is not formed. Therefore, the part in which the notch part 13 is formed has a slightly thin thickness, so that the fracture characteristics of the notch part 13 are increased when the crushing body 11 is crushed, and as a result, the crushing body 11 itself becomes finer. May be broken.

As such, the shredding body 10 according to the present invention forms a notch 13 for increasing the shredding characteristics in the shredding body 11, so that the shredding body 10 is shredded when colliding with the target. (11) can be more finely crushed when the crushing body (10) having a crushing body (11) having a notch portion 13 is provided in the training bullet, the fragments in the shooting training using the training bullet to a long distance It can be seen that it is not scattered but scattered only at a close distance.

In addition, the crushing body 11 may be made of a material having excellent brittleness so as to be finely crushed by the notch 13 when being crushed by colliding with the target and finely crushed by the concentration of collision energy. Here, examples of the material having excellent brittleness that can be used as the shredding body 11 include metal sintered bodies, ceramics, and polymer materials containing at least one kind of metal, and these may be used alone or by mixing two or more thereof. Can be used.

Examples of metals that can be applied to the above-mentioned metal sintered body include Fe-based metals, W, Mo, Zr, Ta, Ti, Nb, V and Hf which are high melting point metals at 1500 ° C or higher. Two or more can be mixed and used. In particular, the metal sintered body has excellent brittleness, so that the metal auxiliary powder such as Fe-based metal, tungsten, etc. can be finely crushed so that small fragments scattered only at a close distance are formed instead of large fragments scattered at a long distance when colliding with the target mule. It can be obtained by mixing the metal sintering process. In addition, examples of the ceramic include aluminum oxide, iron oxide, magnesium oxide, silicon oxide, and the like, and these may be used alone or in combination of two or more thereof. In addition, examples of the polymer material include polyethylene (PE), ABS resin, and the like, and in these cases, they may be used alone or in combination of the two. In particular, the ceramic and polymer materials mentioned above may be provided with a sintered body obtained by performing a sintering process.

In addition, the notch 13 may be formed in the shredding body 11 by notching, or the like. In the present invention, the notch 13 may be formed by notching after the shredding body 11 is formed. In addition, the notch 13 may be formed along the circumference of the crushing body 11. In particular, the notch 13 may be formed along the outer circumference of the crushing body 11. Thus, when the shredding body 11 has a tubular structure as in the present invention, the notches 13 may be formed to be connected to each other along the outer circumference of the shredding body 11 of the tubular structure. In addition, when the notches 13 are formed along the outer circumference of the crushing body 11, at least two notches 13 may be formed at intervals. Therefore, as mentioned, when the shredding body 11 has a tubular structure, the notch 13 may be formed at least two intervals around the shredding body 11 of the tubular structure. That is, at least two notches 13 formed to be connected to each other along the circumference of the crushing body 11 of the tubular structure may be formed at intervals in the crushing body 11 of the tubular structure.

In addition, although not shown, the notch 13 may be formed along the inner circumference of the crushing body 11. In this case, as mentioned, when the shredding body 11 has a tubular structure, the notches 13 may be formed to be connected to each other along the inner circumference of the shredding body 11 of the tubular structure. In addition, when the notches 13 are formed along the inner circumference of the crushing body 11, at least two notches 13 may be formed at intervals. The notch 13 may also be formed along the perimeter of both the outer and inner surfaces of the shred body 11 mentioned.

In addition, the notch 13 may be formed in a direction perpendicular to the circumference of the crushing body 11. In other words, the notch 13 may be formed in the same direction as the flight direction of the training bullet which will be described later. In the case of the notch 13 formed in a direction perpendicular to the circumference of the crushing body 11 mentioned above, at least two are formed at an outer surface, an inner surface, or an outer surface and an inner surface of the crushing body 11 at intervals. Can be. Alternatively, the notch 13 may be formed in an oblique direction around the crushing body 11. In the case of the notch portion 13 formed diagonally around the crushing body 11 mentioned above, at least two of the crushing body 11 may be formed on the outer surface, the inner surface, or the outer surface and the inner surface at intervals. Can be. In addition, the notch 13 may be formed in a spiral direction along the circumference of the crushing body 11. In the case of the notch 13 formed in the helical direction along the circumference of the crushing body 11 mentioned above, it may be formed on the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body 11. In addition, the notch 13 may be formed in a lattice pattern on an outer surface, an inner surface, or an outer surface and an inner surface of the crushing body 11.

As such, the notch 13 in the present invention may be formed to have various structures in the shredding body 11.

As mentioned, the crushing body 10 according to the present invention is brittle so as to form a notch 13 for increasing the crushing characteristics in the crushing body 11 and to be finely crushed by the concentration of collision energy. Since the crushed body 10 is crushed more finely when the crushed body 10 is crushed by colliding with the target because it is formed of a superior material, the flakes are formed more finely when shooting with a practice bullet. It can be seen that it is not scattered but scattered only at a close distance.

And in the shredding body 10 of the present invention, the shredding body 11 may be formed in a tubular structure in which one side 15 is open as shown in FIGS. 1 and 2. That is, as shown in Figures 1 and 2, the shredding body 11 may be formed in a tubular structure in which one side 15 is open and the other side is closed.

3 is a schematic cross-sectional view showing a crusher according to another embodiment of the present invention, Figure 4 is a schematic sectional view showing a crusher according to another embodiment of the present invention.

Here, each of the shredders 10 'and 10 " in Figs. 3 and 4 has the same structure as the shredder 10 in Figs. Reference signs are used and detailed descriptions thereof will be omitted.

Referring to FIG. 3, the shredding body 11 at the shredding body 10 ′ may also have a tubular structure having a through hole 17. Referring to FIG. 4, the shredding body 11 at the shredding body 10 ″ may be formed. 11) can also be made of a solid barrel structure. That is, the crushing body 10 ′ in FIG. 3 may have a tubular structure having a through hole 17 penetrating from one end portion to the other end portion of the crushing body 11 at a central portion thereof in the longitudinal direction, The crushed body 10 ″ in FIG. 4 may be formed in a tubular structure having a hollow structure in the form of a lump.

Here, if the weight of the training bullet having the bullet body accommodated in any one of the shreds (10, 10 ', 10 ") of Figures 1 to 4 can be adjusted to be substantially the same as the weight of the actual coal as mentioned above. As such, the shredding bodies 10, 10 ', and 10 " in the present invention can form the shredding bodies 11 to have various structures. Thus, in the present invention, since the shredding body 11 can be formed to have various structures, the shredding bodies 10, 10 ', 10 " can be more easily manufactured. Particularly, in the present invention, since the shredding body 11 is not structurally limited, when the weight of the training bullet having the shred body in which the shred bodies 10, 10 ', 10 " It can be manufactured in a structure that can optimize the flight trajectory of a training bullet.

In addition, in the case of the shredding bodies 10, 10 ′, 10 ″ according to FIGS. 1 to 4, a part of the shredding bodies 11 is illustrated to have a convex shape, but the structure of the shredding body 11 is not limited thereto. It can be understood to highlight the design according to.

In addition, in the case of the shredding bodies 10, 10 ', 10 "according to FIGS. 1 to 4, the shredding bodies 10, 10', 10" themselves are accommodated in the carbon body or further provided with a pressure-resistant case described later. You may.

5 is a schematic view showing a crushing body further comprising a pressure resistant case.

In FIG. 5, the shredding body 10 accommodated in the pressure-resistant case 21 is limited to the shredding body 10 of FIGS. 1 and 2, but the shredding body 10 ′ of FIG. 3 or the shredding body of FIG. 4 ( 10 ″ may be accommodated in the pressure-resistant case 21. In addition, the shredding body 10 shown in FIG. 5 can be understood in the form which abbreviate | omitted the structure. And it can be understood that the crushing body (11, 10 ', 10 ") consisting of a crushing body 11 is formed with a notch 13 as shown in Figures 1 to 4, and notch 13 as shown in FIG. It can be understood that the breakdown body 10 is further provided with a pressure-resistant case 21 for receiving the crushing body 11 is formed. In addition, the pressure-resistant case 21 may be further provided only when the weight of the training bullet is adjusted to be substantially equal to the weight of the actual bullet as mentioned above.

Referring to FIG. 5, the pressure resistant case 21 has a structure capable of accommodating a crushing body 11 in which a notch 13 is formed. Here, as an example of the pressure-resistant case 21, a tubular structure having a space for accommodating the shredding body 11 may be cited, and the shredding body 11 is not limited thereto. . As described above, further comprising the pressure-resistant case 21 concentrates the collision energy generated when the body collides with the target in the shredding body 11 accommodated therein, and also generates the internal pressure generated in the shredding body 11. This is to increase the pressure significantly above the breaking threshold so that the breaking body 11 can be broken more finely. Therefore, the pressure-resistant case 21 concentrates collision energy in the crushing body 11 to a crushing threshold value or more so that the crushing body 11 accommodated therein can be crushed more finely and can maximize pressure resistance. It may be made of a material.

Thus, the pressure resistant case 21 mentioned above is preferably made of a plastic having an elongation of about 100 to 1,000 times compared to the crushing body (11). If the elongation of the pressure-resistant case 21 is less than about 100 times the elongation of the crushing body 11, it is not preferable because the crushing body 11 may be crushed before impact with the target by the firing pressure. If it exceeds about 1,000 times, it is not preferable because the pressure-resistant case 21 does not break properly when it collides with the target. In addition, the pressure-resistant case 21 mentioned above is preferably made of a plastic having a tensile strength of about 0.01 to 0.1 times the crushing body (11). If the tensile strength of the pressure-resistant case 21 is less than about 0.01 times the tensile strength of the crushing body 11, since the pressure-resistant case 21 itself may be broken by the firing pressure, it is not preferable. It is not preferable to exceed the pressure resistance case 21 because the pressure-resistant case 21 is not properly crushed when colliding with the target.

Thus, the pressure resistant case 21 may be made of a polymer resin having a higher elongation, a lower tensile strength, and the like than the crushed body 11. Examples of the polymer resin that can be produced with the pressure-resistant case 21 mentioned above include polyolefin-based plastics, polyester-based plastics, polyether-based plastics, polyvinyl-based plastics, polyamide-based plastics, fiber-reinforced thermoplastics (FRTP), and thermosetting plastics. And the like, and these may be used alone or in combination of two or more thereof. Examples of the polyolefin-based plastics include polyethylene (PE), polypropylene (PP), poly (4-methyl-1pentene), and the like. Examples of the polyester-based plastics include polyethylene terephthalate (PET) and polybutylene tele. Phthalate (PBT), polycarbonate (PC), polyarylate (PAR), and the like. Examples of polyether plastics include polyacetal (POM), polyphenylene oxide (PPO), and modified polyphenylene oxide (MPPO). ), Polysulfone (PSF), polyether sulfone (PES), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), and the like, and examples of polyvinyl plastics include polyvinyl chloride (PVC) and poly Vinylidene chloride (PVDC), polyvinyl acetate (PVAC), polyvinyl alcohol (PVAL), polyvinyl acetal, polyvinyl formal, polystyrene (PS), AS resin, ABS resin, polymethyl methacrylate (PMMA), Fluorine resins and the like; Examples of the plastic include polyamide (nylon PA), polyamideimide (PAI), polyimide (PI), and the like. Examples of thermosetting plastics include phenol resin (PF), urea resin (UF), melamine resin (MF), Unsaturated polyester resin (UP), epoxy resin (EP), polyurethane (PUR), diallyl phthalate resin (DAP), polyimide (PI), silicone resin (SI) and the like.

Accordingly, the crushing body 10 according to the present invention is formed of a material having excellent brittleness so as to form a notch 13 for increasing crushing characteristics in the crushing body 11 and to be finely crushed by the concentration of collision energy. It is formed, and further provided with a pressure-resistant case 21, when the crushed body 10 is crushed by colliding with the target can be more finely crushed body 11 can be shredded finely when shooting training using a practice bullet By forming, it turns out that it does not scatter at a long distance, but scatters only at a close distance. That is, the crushing body 10 of the present invention can be more finely crushed as mentioned, as compared to the conventional metal filling, and as a result, debris having a lighter weight can be generated and can only be scattered within a short distance.

Hereinafter, the practice shot provided with the said shredding bodies 10, 10 ', and 10 "is demonstrated. Here, the shredding bodies (10, 10 ', 10 ") provided in the practice bullet of the present invention have the same structure and function as in Figs. 1 to 5, and the same reference numerals are used for the same members, and the detailed description thereof It will be omitted. In addition, below, the training coal provided with the shredding body 10 of FIG. 1 and FIG. 2 is demonstrated.

Figure 6 is a schematic diagram showing a training bullet according to an embodiment of the present invention.

Referring to FIG. 6, the training bullet 30 includes a body 31 and a crushed body 10.

In particular, the training bullet 30 has the same conditions as the actual shot, the structure, the weight and the like. Accordingly, the body 31 of the training bullet 30 mainly includes spikes colliding with a target, a member accommodating the shredder 10, and a tail disposed at a rear end of the member accommodating the shredder 10. Can be. Thus, based on the practice bullet 30 shown in FIG. 6, a portion that is elongated at the front part based on the member accommodating the shredder 10 corresponds to a spike, and the member accommodating the shredder 10. The part placed at the rear of the head corresponds to the tail. The member mentioned above is formed in a structure having a space for receiving the crushed body 10, and also has a structure in which spikes and tails are each tab-coupled with a member for receiving the crushed body 10. Here, since the spike and the tail mentioned above are almost the same as in the related art, detailed description thereof will be omitted, and a part corresponding to the member accommodating the shredding body 10 will be described with the carbon body 31.

Here, the coal body 31 mentioned above is made of a metal mainly by accommodating the crushed body 10. In particular, examples of the metal that can be used for the carbon body 31 include aluminum, iron, and the like, and these may be used alone or in combination of the two. And the shredding body 10 is accommodated in the body 31, it may be provided with a shredding body 11 is formed with a notch 13, as mentioned in Figs. 1 and 2, or referred to in Fig. As described above, the pressure resistant case 21 may be further provided.

Thus, in the case of the above-mentioned practice bullet 30, by providing the shredding body 10 in the shell 31, it can be provided to have almost the same weight as the actual bullet, while having the same appearance as the actual bullet. Therefore, the shooting training using the practice shot 30 of the present invention can be performed under almost the same conditions as the shooting training using the real shot, and as a result, an increase in the training effect on the shooting training using the training shot 30 is expected. Can be.

Therefore, in the case of the practice shot 30 in the present invention, the brittle material 11 is formed of a notch 13 for increasing the crushing characteristics of the brittle material, and also has a brittle material so as to be finely crushed by the concentration of collision energy. Since it is provided with a crushing body (10) formed in addition, the pressure-resistant case 21 so that the crushing body 11 can be more finely crushed when the crushing body 10 is crushed by colliding with the target When the shooting drill using the practice shot 30, the debris is formed finely, it can be seen that the scattered at a close distance, not scattered at a long distance.

As mentioned, the practice bullet of the present invention can expect to achieve a better shooting training effect because it can perform almost the same shooting training as a real bullet despite the use of a crushing body having a structure that is easy to fracture in a collision. As a result, more stable shooting training is possible.

In addition, the practice bullet of the present invention can shorten the scattering distance of the debris because it can be induced to be broken more finely by applying the crushed body as mentioned. Therefore, in the shooting training using the practice bullet of the present invention, it is possible to reduce the damage to the public, and as a result, it is possible to proceed with a more stable shooting training.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.

10, 10 ', 10 ": crushed body 11: crushed body
13: notch 21: pressure-resistant case
30: practice bullet 31: bullet

Claims (9)

A crushing body which is applied to the carcass that is flying by the explosive force of the propelling charge, and is manufactured to have brittleness through sintering so that the carcass is crushed by the collision energy generated by colliding with the target;
A notch portion formed to have a structure in which the crushing body is recessed so that the crushing characteristic due to the collision energy is increased and finely crushed when the crushing body is crushed; And
It includes a pressure-resistant case for accommodating the crush body formed with the notch portion to increase the pressure applied to the crush body formed with the notch portion by the impact energy generated when the body collides with the target to finely crush the crush body formed with the notch portion Is composed by
The shredding body is made of a metal sintered body, ceramic, polymer material, or a mixture thereof containing at least one kind of metal. delete The crushing body according to claim 1, wherein the crushing body has a cylindrical structure having one side open, a cylindrical structure having a through hole, or a hollow cylindrical structure. The shredding body of claim 1, wherein at least two notches are formed along the periphery of the outer surface, the inner surface, or the outer surface and the inner surface of the shredding body. The method of claim 1, wherein the notch is formed at least two intervals in the direction perpendicular to the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body, or the outer surface, the inner surface of the crushing body Or at least two are formed at intervals in an oblique direction around the outer surface and the inner surface, or are formed in the spiral direction along the outer surface, the inner surface, or the outer surface and the inner surface of the shredding body, or Crushed body, characterized in that formed on the outer surface, the inner surface, or the outer surface and the inner surface of the shredding body in a grid pattern. delete A body in which the flight is carried out by the explosive force of the propulsion charge; And
A crushing body which is manufactured to have brittleness through sintering and is accommodated in the body to control the weight of the body and is crushed by collision energy generated when the body collides with a target by the explosive force of the propelling charge; The notched portion formed to have a recessed structure in the crushing body so that the crushing characteristic due to the collision energy is increased and finely crushed when crushed, and the crushed body in which the notched portion is formed by the collision energy generated when the body collides with a target. It is configured to include a pressure-resistant case for receiving the crushed body formed with the notched portion so that the crushed body formed with the notch portion by increasing the pressure applied to the fine,
The pulverized body includes a pulverized body comprising a sintered body made of a metal sintered body, ceramic, polymer material, or a mixture thereof containing at least one kind of metal. 8. The practice bullet according to claim 7, wherein the notch is formed at least two at intervals along an outer surface, an inner surface, or an outer surface and an inner surface of the crushing body. The method of claim 7, wherein the notch is formed at least two spaced apart in the direction perpendicular to the outer surface, the inner surface, or the outer surface and the inner surface of the crushing body, or the outer surface, the inner surface of the crushing body Or at least two are formed at intervals in an oblique direction around the outer surface and the inner surface, or are formed in the spiral direction along the outer surface, the inner surface, or the outer surface and the inner surface of the shredding body, or Exercise bullet, characterized in that formed in a grid pattern on the outer surface, the inner surface, or the outer surface and the inner surface of the shredding body.

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