KR101166672B1 - Manufacturing method of shrapnel ring - Google Patents

Abstract

The present invention relates to a method of making a debris ring, comprising the steps of: making a model of a debris ring comprising a plurality of notches formed in a circumferential direction, the debris ring being made of a hollow body having a circular shape; injecting the molten metal through a channel formed on an inner circumferential surface or an outer circumferential surface of the debris ring Assembling a plurality of the molds into a single cluster so as to be able to form a plurality of clusters, and repeatedly coating a surface of the clusters with a refractory in a slurry state to manufacture a mold; melting and discharging the mold; Injecting the preheated and dissolved metal into the preheated mold, cooling the mold into which the metal has been injected, removing the mold, and cutting the metal corresponding to the shape of the debris ring And a method of manufacturing a debris ring.

Description

TECHNICAL FIELD [0001] The present invention relates to a manufacturing method of a shrapnel ring,

The present invention relates to a method of manufacturing a debris ring used for the debris effect of ammunition.

Ammunition refers to explosives designed to damage personnel, equipment, structures, or other military targets. Ammunition can be, for example, shot, bomb or landmine, fired by an artillery, dropped by an aircraft, or buried in the ground.

In order to further increase the power of the explosion, ammunition can be designed to cause storm and debris effects at the time of the explosion. For example, in the case of a hand grenade or Cremora, a gunpowder blows out, and metal fragments or iron balls spread out to increase the killing effect.

The ammunition is broken by the explosive pressure to form debris itself. Therefore, it is difficult to have uniform fragments, the shape is non-uniform, the number of effective fragments is small, and the kill radius is narrow.

A debris ring mounted inside the ammunition to produce a more improved storm and debris effect, and a method of manufacturing a debris ring that can be easily manufactured therefrom.

An object of the present invention is to propose a method of manufacturing a debris ring which has an excellent debris effect and can be easily manufactured.

Another object of the present invention is to propose a debris ring which can cause storm and debris effects upon explosion of ammunition.

According to an aspect of the present invention, there is provided a method of manufacturing a debris ring, the debris ring including a plurality of notches formed along a circumferential direction, the hollow ring having a circular shape, Assembling a plurality of the molds into one cluster so that the molten metal can be injected through a channel formed in the inner circumferential surface or the outer circumferential surface of the debris ring; The method of claim 1, further comprising the steps of: preparing a mold by repeatedly coating the mold; melting and discharging the mold; preheating the mold and injecting the molten metal into the preheated mold; Removing the mold, and cutting the metal corresponding to the shape of the debris ring All.

According to one embodiment of the present invention, the step of forming the mold of the debris ring includes placing a plurality of dissimilar metal pieces formed of a material different from the metal on the mold of the mold, and injecting wax into the mold And making the model.

According to another embodiment of the present invention, a mold that is formed so that the plurality of dissimilar metal pieces can be fitted is inserted into the fabricating mold.

According to another embodiment of the present invention, the frame forms a closed curve, a concave portion and a convex portion are sequentially formed along the circumferential direction, and one of the dissimilar metal pieces is inserted into the convex portion.

In order to achieve the above-mentioned object, the present invention provides a body which is made of a hollow body having a circular shape and which is formed so as to cover a gunpowder mounted inside the body, and a body which, upon explosion of the ammunition, A plurality of notches formed on an inner circumferential surface and an outer circumferential surface of the body, a notch formed on an inner circumferential surface, and a notch formed on an outer circumferential surface of the body, Disclosed is a debris ring staggered along a circumferential direction.

According to one example of the present invention, the debris ring is inserted into the body, and a plurality of heterogeneous bodies formed of a different material from the body so that the body can be separated into a plurality of debris by the explosion pressure upon explosion of the ammunition And further includes a metal piece.

According to the present invention, it is possible to mass-produce the debris ring, and the debris ring can have a uniform particle size, resulting in an excellent debris effect.

Further, according to the present invention, a debris ring in which a plurality of notches are formed can be mounted inside the ammunition, and when the ammunition explodes, the debris ring can be destroyed and scattered in a uniform size, resulting in storm and debris effects.

1 is a partial cutaway view of an ammunition in accordance with an embodiment of the present invention.
2 is a perspective view of a fragment ring according to one embodiment of the present invention.
Figures 3A-3C are perspective views of a fragment ring according to another embodiment of the present invention;
Figures 4 and 5 are flow charts illustrating a method of making a fragment ring of the present invention.
6 and 7 are a perspective view and a plan view showing a state in which a dissimilar metal piece is placed in a mold for making a model by a mold.

Hereinafter, a method of manufacturing a fragment ring according to the present invention will be described in detail with reference to the drawings. In the present specification, the same reference numerals are given to the same or similar embodiments, and the same reference numerals are given to similar components. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

1 is a partial cutaway view of an ammunition in accordance with an embodiment of the present invention.

FIG. 1 shows an aerial explosion gun of an example of an ammunition to which a debris ring 50 can be mounted. The aerial explosion consists of a warhead assembly (A) for attacking the target and a propulsion assembly (B) for allowing the warhead assembly (A) to fly over the target.

The warhead assembly A includes a high explosive 15, a body 10, a fuse 20, an adapter 25, and a rotary bulb 40.

A bullet 15 is embedded in the body 10, and the bullet 10 is ruptured by the explosion pressure to form a plurality of fragments. A debris ring 50, which can be separated by a plurality of debris at the time of explosion of the high explosive 15, may be installed in the body 10.

At the front end of the body (10), a new pipe (20) for igniting the high explosive (15) is connected and attached by an adapter (25). At the rear end of the body 10, a rotating barb 40 for moving the ammunition is mounted along the steel barrel or barrel.

The propulsion subassembly B includes a shell 30, a propellant 35 and a primer 36.

The shell 30 is provided at the rear end of the shell 10, and the propellant 35 is filled therein. At the rear end of the shell 30, a primer 36 for igniting the propellant 35 is mounted.

Hereinafter, a fragment ring 50 and a method for manufacturing the fragment ring will be described with reference to an example in which the number of effective fragments and the radius of gyration are increased by the explosive pressure when the explosive of the ammunition is exploded.

Figure 2 is a perspective view of a debris ring 50 in accordance with one embodiment of the present invention.

Referring to Fig. 2, the debris ring 50 includes a hollow body having a circular shape and a plurality of notches 51a and 52a formed on at least one side of the body.

The body may have a ring shape or a partially cut annular shape. The body is configured to wrap a gunpowder, such as a high explosive 15, mounted within the body 10.

At least one of the inner circumferential surface 51, the outer circumferential surface 52, the front surface 53 and the rear surface 54 of the body is provided with a plurality of notches (not shown) which can be uniformly separated into a plurality of fragments 51a, 52a may be formed. The notches 51a and 52a may have a V-shaped or U-shaped cross section.

A plurality of notches 51a and 52a are formed in the inner circumferential surface 51 and the outer circumferential surface 52 of the body and a notch 51a formed in the inner circumferential surface 51 has a notch 52a formed in the outer circumferential surface 52, They can be staggered from each other along the circumferential direction. Through such a structure, the body can be broken up along the notches 51a and 52a formed on the inner and outer circumferential surfaces 51 and 52 at the time of explosion of the ammunition, so that more fragments can be formed.

Notches may also be formed on the front face 53 and the rear face 54 of the body, respectively. The notches formed on the front surface 53 may be connected to the notches 51a and 52a formed on the inner circumferential surface 51 or the outer circumferential surface 52. [ Conversely, the notches formed on the rear surface 54 may be connected to the notches 51a and 52a formed on the inner circumferential surface 51 or the outer circumferential surface 52, and may be staggered along the circumferential direction with the notches formed on the front surface 53 have.

In this case, the notches formed on the front surface 53 and the rear surface 54 guide the breaking direction so that the body is formed of a plurality of pieces along the notches 51a and 52a formed on the inner circumferential surface 51 or the outer circumferential surface 52 .

The notches 51a and 52a formed in the inner circumferential surface 51 and the outer circumferential surface 52 may be arranged to face each other along the circumferential direction of the body. The notches formed on the front surface 53 and the rear surface 54 may be connected to the notches 51a and 52a formed on the inner circumferential surface 51 and the outer circumferential surface 52, respectively.

A plurality of holes may be formed in the body at regular intervals in place of the notches 51a and 52a or in place of the notches 51a and 52a.

3A-3C are perspective views of a debris ring 50 according to another embodiment of the present invention.

3A to 3C, a dissimilar metal piece 55 formed of a material different from that of the body may be inserted into the body. The dissimilar metal piece 55 allows rapid fracture at the interface between the body and the dissimilar metal piece 55 upon detonation of the ammunition so that the fragment ring 50 can be separated into a larger number of fragments.

The dissimilar metal pieces 55 and 55 'may be formed in a ball or cube shape (see FIG. 3C). The dissimilar metal piece 55 may be made of, for example, tungsten.

2, the dissimilar metal piece 55 is formed so that the center of the dissimilar metal piece 55 corresponds to at least one of the notches 51a and 52a formed in the inner circumferential surface 51 or the outer circumferential surface 52 in the circumferential direction .

The dissimilar metal pieces 55 are arranged in a space between the notches 51a and 52a formed on the inner circumferential surface 51 or the outer circumferential surface 52 or arranged so that their centers are located on the line connecting the opposed notches 51a and 52a .

Figures 4 and 5 are flow charts illustrating a method of making the debris ring 50 of the present invention.

4 and 5, the method of manufacturing the debris ring 50 includes the steps of making a model S100 of the debris ring 50, assembling the model into a cluster S200, (S500) of injecting the molten metal into the mold; a step (S600) of removing the mold; and a step (S600) of removing the mold corresponding to the debris ring (50) And cutting the metal (S700).

Step S100 of making a model of the debris ring 50 is a step of making a model of the debris ring 50 to be manufactured using wax, plastic or the like. The debris ring 50 is composed of a hollow body having a circular shape and includes a plurality of notches 51a and 52a formed along the circumferential direction as described above.

When a plurality of debris rings 50 are modeled, the molten metal is introduced into one face of the debris ring 50, that is, a channel formed on the inner circumferential face 51, the outer circumferential face 52, the front face 53, or the rear face 54 A plurality of the models are assembled into a cluster or a tree form so that they can be injected through the plurality of models (S200).

Thereafter, a refractory material in a slurry state on the surface of the cluster is repeatedly coated several times according to the shape and size of the final metal product to produce a mold (S300). The coating can be made, for example, ten times.

In each coating process, the refractory sand is applied to the surface of the cluster before the refractory in the form of slurry is dried, and then dried.

After the coating of each layer, it is preferable to dry the mold in a constant temperature / humidity chamber under predetermined conditions, and then conduct coating of the next order. This is because it is necessary to sufficiently dry the coating layer to prevent cracking of the mold.

For example, after one layer of coating, the mold can be dried for at least 5 hours in a constant temperature / humidity chamber maintained at a temperature of 23 ± 1 ° C and a relative humidity of 50 to 60%. After the finish coating, the mold may be dried for at least 12 hours in a constant temperature / humidity chamber under the above conditions.

After the mold is manufactured, the mold is melted and discharged (S400). For example, the mold is maintained in a high-pressure vessel of about 7 to 8 kgf / cm 2 for about 20 minutes to discharge the mold formed of wax or plastic in the mold.

Thereafter, the molten metal serving as the material of the debris ring 50 is injected into the preheated mold (S500) after preheating the mold in which the mold is completely exhausted. After the mold is preheated at about 1000 ° C for at least one hour, the molten metal in the high frequency induction melting furnace can be injected into the sufficiently preheated mold. The metal may be, for example, IC4140 or SCM440.

Prior to injecting the molten metal into the preheated mold, an inoculant may be added to adjust the grain size of the debris ring 50. With the addition of the inoculant, the metal grains become finer and uniform, so that the fragment rings 50 can be destroyed in a uniform size. In addition, the number of fragments increases, so that a better fragmentation effect can be obtained. The inoculum may be, for example, Co-Aluminate.

After cooling the mold into which the metal is injected to room temperature, breaking the mold, a cluster or a tree to which a plurality of debris rings 50 are connected is displayed (S600). A plurality of debris rings 50 can be obtained by cutting each debris ring 50 corresponding to the shape of the debris ring 50 in the cluster (S700).

The precise casting of the debris ring 50 can be obtained through such steps as grinding of the gate, removal of the residual mold, and removal of surface foreign matter. In addition, heat treatment may be performed to obtain desired mechanical properties.

It is desirable to have a hardness of HRC 38 to 45 by annealing / quenching / tempering in order to prevent segregation which may occur in the casting and to obtain a uniform debris effect.

The above-described manufacturing method of the debris ring 50 can produce the same debris ring 50 as the precisely manufactured model, so that the design notch can be precisely realized. In addition, excellent debris effect can be obtained by controlling the grain size and uniformizing by the inoculation effect.

The method of manufacturing the debris ring 50 allows a plurality of debris rings 50 to be obtained through one cluster so that mass production of the debris ring 50 is possible and the production cycle of the debris ring 50 is shortened, The manufacturing cost is lower than other methods such as machining.

6 and 7 show a state in which the dissimilar metal piece 55 is placed on the model making mold 60 by the mold 70 in order to manufacture the debris ring 50 into which the dissimilar metal piece 55 is inserted And FIG.

In order to insert the dissimilar metal piece 55 into the body of the debris ring 50, a step S100 of making the debris ring 50 is performed by forming a plurality of dissimilar metal pieces 55, Placing the mold 60 in a mold, and molding the mold by injecting wax into the mold.

6 and 7, a mold 70, which is formed so that a plurality of dissimilar metal pieces 55 can be fitted, can be placed in a mold 60 for making a mold. The mold 70 may be any material that does not melt together with the mold in the step of melting and discharging the mold, and may be any shape that can fix the dissimilar metal piece 55.

For example, the frame 70 forms a closed curve, and a concave portion and a convex portion along the circumferential direction may be sequentially formed. And a single dissimilar metal piece 55 may be inserted into the inside of the convex portion.

A plurality of molds having different kinds of metal pieces 55 in the wax are assembled into a cluster S200 and the molds S300, S400, mold preheating, metal injection S500, mold cooling, It is possible to mass-produce the debris ring 50 in which the dissimilar metal pieces are inserted through the step S600 and the step of cutting the debris ring 50 (S700).

The above-described fragment ring and the method of manufacturing the same are not limited to the configuration and the method of the embodiments described above, but the embodiments may be configured such that all or some of the embodiments are selectively combined have.

Claims (6)

Making a model of a debris ring comprising a hollow body having a circular shape and including a plurality of notches formed along a circumferential direction;
Assembling the plurality of the molds into one cluster so that the molten metal can be injected through the channels formed on the inner circumferential surface or the outer circumferential surface of the debris ring;
Repeatedly coating a surface of the cluster with a refractory in a slurry state to produce a mold;
Melting and discharging the model;
Preheating the mold and injecting the molten metal into the preheated mold;
Cooling the mold to which the metal is injected, and removing the mold; And
Cutting the metal corresponding to the shape of the debris ring,
The step of making a model of the debris ring comprises:
Placing a plurality of dissimilar metal pieces formed of a material different from the metal on a mold of the mold; And
And molding the mold by injecting wax into the mold,
A mold formed to be capable of fitting the plurality of dissimilar metal pieces is inserted into the mold,
Wherein the mold forms a closed curve, and a concave portion and a convex portion are sequentially formed along the circumferential direction, and one of the dissimilar metal pieces is fitted to the inside of the convex portion. delete delete delete A body made of a hollow body having a circular shape and formed so as to cover a gunpowder mounted inside the body;
A plurality of notches formed on at least one side of the body such that the body can be separated into a plurality of fragments by the explosion pressure upon explosion of the ammunition; And
And a plurality of dissimilar metal pieces inserted into the body and formed of a material different from the body so that the body can be separated into a plurality of pieces by explosion pressure when the ammunition explodes,
Wherein the plurality of notches are formed on the inner circumferential surface and the outer circumferential surface of the body, and the notches formed on the inner circumferential surface and the notches formed on the outer circumferential surface are staggered along the circumferential direction of the body. delete

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