Shell and explosive

Abstract

The utility model belongs to the technical field of explosives, and discloses a shell and the explosives, the shell comprises a plurality of fragment parts and a plurality of groove bottoms, the fragment parts are arranged at intervals, the interval space between every two adjacent fragment parts is a pre-carved groove, every two adjacent fragment parts are connected through the corresponding groove bottom, and the pre-carved groove is formed in the shell. The groove bottom is located in the depth direction of the pre-carved groove, and the density of the fragment part is larger than that of the groove bottom. According to the utility model, the cracking difficulty of the shell along the depth direction of the pre-carved groove is reduced, so that the phenomenon that fragment parts are connected is avoided, and the explosion effect of an exploding product is improved.

Description

Technical Field

[0001] This utility model relates to the field of explosives technology, and more particularly to casings and explosives. Background Technology

[0002] When explosives such as grenades or artillery shells explode, their outer shells rupture to form fragments, which are then used as the warhead. To improve the explosive effect, the outer shell structure is usually modified so that the fragments are formed as regularly as possible when the shell breaks. For example, application number CN202123094672.8, entitled "A 3D Printed Artillery Shell Casing," describes a method where the inner wall of the shell body is provided with warp and weft grooves, which divide the shell body into several regions. When the explosive detonates, the stress is concentrated in the warp and weft grooves, causing the shell body to split into several fragments along the grooves.

[0003] However, although the casings of explosives are made of high-toughness and high-strength metal materials, in reality, after an explosive detonates, fragments still remain connected, which does not meet the requirements. Utility Model Content

[0004] The purpose of this invention is to provide a casing and explosives, reduce the difficulty of cracking the casing along the depth of the pre-grooved groove, avoid the phenomenon of connected fragments, and improve the explosive effect of the explosives.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a housing is provided, the housing comprising a plurality of fragment portions and a plurality of groove bottoms, the plurality of fragment portions being arranged at intervals, the space between two adjacent fragment portions being a pre-etched groove, two adjacent fragment portions being connected through the groove bottoms, the groove bottoms being located in the depth direction of the pre-etched grooves, and the density of the fragment portions being greater than the density of the groove bottoms.

[0007] As an optional technical solution, the housing is a rotating body, and the rotating body has a through hole in the middle.

[0008] As an optional technical solution, in the depth direction of the pre-cut groove, the opening of the pre-cut groove faces the central axis of the rotating body;

[0009] Alternatively, in the depth direction of the pre-cut groove, the opening of the pre-cut groove is away from the central axis of the rotating body.

[0010] As an optional technical solution, the outer or inner wall of the rotating body is provided with multiple pre-etched grooves, some of which are positive spiral grooves and others are negative spiral grooves;

[0011] The forward spiral groove spirals around the central axis of the rotating body, and the reverse spiral groove spirals around the central axis of the rotating body.

[0012] As an optional technical solution, the outer or inner wall of the rotating body is provided with multiple pre-etched grooves, some of which are warp grooves and others are weft grooves;

[0013] The warp groove extends parallel to the central axis of the rotating body, and the weft groove surrounds the central axis of the rotating body.

[0014] As an optional technical solution, the depth direction of the pre-etched groove is set at an angle to the central axis of the rotating body, and the angle is less than 90°.

[0015] As an optional technical solution, the width of the pre-etched groove is 0.1-0.2 mm.

[0016] As an optional technical solution, the thickness of the bottom of the groove is less than 0.5 mm along the depth direction of the pre-etched groove.

[0017] As an optional technical solution, the central axis of the rotating body is perpendicular to the transverse section of the rotating body, and the pre-cut groove in the transverse section of the rotating body is square, U-shaped, or V-shaped;

[0018] And / or, the central axis of the rotating body is located in the longitudinal section of the rotating body, and in the longitudinal section of the rotating body, the pre-cut groove is square, U-shaped, or V-shaped.

[0019] Secondly, explosives are provided, the explosives comprising a casing as described above.

[0020] The beneficial effects of this utility model are:

[0021] This utility model provides a shell and an explosive. The explosive includes the shell, which includes multiple fragment sections and multiple groove bottoms. The multiple fragment sections are arranged at intervals, and the space between two adjacent fragment sections is a pre-cut groove. Two adjacent fragment sections are connected by the groove bottoms, which are located in the depth direction of the pre-cut grooves. The density of the fragment sections is greater than that of the groove bottoms.

[0022] Because the density of the fragmented part is greater than that of the bottom of the groove, the bottom of the groove is more prone to cracking than the fragmented part. When the explosive explodes, under the action of the explosion pressure, the shell cracks along the depth direction of the pre-cut groove. The bottom of the groove is located in the depth direction of the pre-cut groove. The crack passes through the bottom of the groove along the depth direction of the pre-cut groove, thereby separating two adjacent fragmented parts. After the shell explodes, each fragmented part is separated, and there is no situation where two fragmented parts are connected through the bottom of the groove. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the first structural design of the shell of this utility model;

[0024] Figure 2 This is a schematic diagram of a second structural design for the housing of this utility model;

[0025] Figure 3 This is a schematic diagram of the third structure of the shell of this utility model;

[0026] Figure 4 This is a schematic diagram of the fourth structure of the shell of this utility model;

[0027] Figure 5 This is a front view of the longitudinal section of the shell of this utility model;

[0028] Figure 6 yes Figure 5 A magnified view of a portion of position A in the middle;

[0029] Figure 7 This is a side view of the longitudinal section of the shell of this utility model;

[0030] Figure 8 This is a top view of the transverse cross-section of the shell of this utility model;

[0031] Figure 9 yes Figure 8 A magnified view of a portion of position B in the middle;

[0032] Figure 10 This is a side view of the transverse cross-section of the shell of this utility model;

[0033] In the picture:

[0034] 1. Fragment section; 2. Bottom of the groove; 3. Pre-cut groove. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] like Figure 1 As shown, the shell is a cylindrical rotating body with multiple pre-cut grooves 3 on its outer wall. Some of the pre-cut grooves 3 are positive spiral grooves, and the other part of the pre-cut grooves 3 are negative spiral grooves.

[0040] like Figure 2 As shown, the shell is a conical rotating body. The outer wall of the rotating body is provided with multiple pre-cut grooves 3. Some of the pre-cut grooves 3 are warp grooves, and the other part of the pre-cut grooves 3 are weft grooves.

[0041] like Figure 3 As shown, the shell is a rotating body with a tapered waist. The outer wall of the rotating body is provided with multiple pre-cut grooves 3. Some of the pre-cut grooves 3 are warp grooves, and the other part of the pre-cut grooves 3 are weft grooves.

[0042] like Figure 4 As shown, the shell is a cylindrical rotating body with multiple pre-cut grooves 3 on its outer wall. Some of the pre-cut grooves 3 are warp grooves, and the other part of the pre-cut grooves 3 are weft grooves.

[0043] Figures 5 to 10 The structures shown are all based on Figure 4 The shell shown is the basis.

[0044] like Figures 1 to 10 As shown, this embodiment provides a housing, which includes multiple fragment sections 1 and multiple groove bottoms 2. The multiple fragment sections 1 are arranged at intervals, and the space between two adjacent fragment sections 1 is a pre-cut groove 3. Two adjacent fragment sections 1 are connected by the groove bottoms 2, and the groove bottoms 2 are located in the depth direction of the pre-cut grooves 3. The density of the fragment sections 1 is greater than the density of the groove bottoms 2.

[0045] Because the density of the fragment part 1 is greater than that of the groove bottom 2, the groove bottom 2 is more prone to cracking than the fragment part 1. When the explosive explodes, under the action of the explosion pressure, the shell cracks along the depth direction of the pre-cut groove 3. The groove bottom 2 is located in the depth direction of the pre-cut groove 3. The crack passes through the groove bottom 2 along the depth direction of the pre-cut groove 3, thereby separating two adjacent fragment parts 1. After the shell explodes, each fragment part 1 exists independently, and there is no situation where two fragment parts 1 are connected through the groove bottom 2.

[0046] Packing density, also known as packing ratio or maximum space utilization, refers to the percentage of volume occupied by atoms within a unit cell, i.e., the ratio of the volume of atoms contained in the unit cell to the volume of the unit cell. The concept of packing density is used to describe the degree of compactness of atomic arrangement in a crystal structure. In this embodiment, the fragmented part 1 is a high-density region, and the bottom of the groove 2 is a low-density region. The fragmented part 1 has stronger toughness and higher strength, while the bottom of the groove 2 has weaker toughness and strength than the fragmented part 1. Therefore, during the shell's cracking process, the crack is more likely to penetrate the bottom of the groove 2 along the depth direction of the pre-etched groove 3.

[0047] Optionally, the casing can be made of a metallic material, such as a tungsten alloy.

[0048] In the production of the shell of this embodiment, tungsten alloy powder is laid layer by layer. After each layer of tungsten alloy powder is laid, selective laser melting technology is used to heat melt the tungsten alloy powder. The material corresponding to the bottom of the tank 2 and the material corresponding to the fragment part 1 are heat melted using two different laser parameters, thereby obtaining the bottom of the tank 2 and the fragment part 1 with different densities.

[0049] In this embodiment, the shell is a rotating body, and a through hole is provided in the middle of the rotating body, with the explosive located in the through hole.

[0050] In other embodiments, the housing is a non-rotating body, such as a cubic or prismatic structure.

[0051] In some embodiments, the opening of the pre-etched groove 3 faces the central axis of the rotating body in the depth direction. The pre-etched groove 3 is located inside the rotating body, and the bottom 2 of the groove is located outside the rotating body.

[0052] In some other embodiments, the opening of the pre-etched groove 3 is away from the central axis of the rotating body in the depth direction. The pre-etched groove 3 is on the outer side of the rotating body, and the bottom 2 of the groove is located on the inner side of the rotating body.

[0053] In some embodiments, the outer or inner wall of the rotating body is provided with multiple pre-etched grooves 3, some of which are forward spiral grooves and others are reverse spiral grooves; the forward spiral grooves spiral around the periphery of the central axis of the rotating body, and the reverse spiral grooves spiral around the periphery of the central axis of the rotating body.

[0054] In some other embodiments, the outer or inner wall of the rotating body is provided with multiple pre-cut grooves 3, some of which are warp grooves and others are weft grooves; the extension direction of the warp grooves is parallel to the central axis of the rotating body, and the weft grooves surround the central axis of the rotating body.

[0055] like Figures 2 to 4 As shown, the rotating body is divided into several layers along the axial direction, and each layer includes several fragment sections 1. The fragment sections 1 of adjacent layers are staggered along the axial direction.

[0056] In some other embodiments, the rotating body is divided into several layers along the axial direction, each layer including several fragments 1, and adjacent fragments 1 are arranged in a one-to-one correspondence along the axial direction.

[0057] like Figure 6 As shown, in this embodiment, the depth direction of the pre-cut groove 3 is set at an angle to the central axis of the rotating body, and the angle is less than 90°. The depth direction of the pre-cut groove 3 refers to the direction between the inner wall and the outer wall of the rotating body. Figure 6 In the longitudinal section of the rotating body, the pre-cut groove 3 extends obliquely from the outer wall of the rotating body to the bottom of the groove 2.

[0058] When the shell of this embodiment is prepared by 3D printing, the depth direction of the pre-cut groove 3 is designed to be non-perpendicular to the central axis of the rotating body, so that the pre-cut groove 3 of any shape can be printed, the shell structure is intact, and other material linkage phenomena are prevented from occurring in the pre-cut groove 3.

[0059] The shell in this embodiment is made of tungsten alloy using 3D printing technology (SLM: Selective Laser Melting). The resulting shell has a pre-grooved groove 3 with a higher aspect ratio. However, a shell machined by a lathe can only produce grooves in the spiral direction, not in the warp and weft directions. Furthermore, the aspect ratio of the spiral grooves is too small to meet the requirements. A single-layer ring can be machined using powder metallurgy methods, such as metal injection molding. Grooves are then cut on the surface of the single-layer ring, and multiple single-layer rings are stacked and welded to obtain a complete rotating body. This method can use a tool to cut grooves on the single-layer ring or use wire cutting. However, the use of tools is greatly limited, and tungsten alloy has poor machinability. Grooves with a higher aspect ratio cannot be obtained during the machining process. The bottom thickness of the groove is too high, and there are gaps in the stacking and welding of the single-layer rings, making the quality uncontrollable. When using wire cutting, the width of the groove is limited by the diameter of the wire. The groove width obtained by this method is greater than the width of the pre-grooved groove 3 in this embodiment.

[0060] In some other embodiments, the depth direction of the pre-cut groove 3 is perpendicular to the central axis of the rotating body.

[0061] In this embodiment, the width of the pre-etched groove 3 is 0.1-0.2 mm, and the thickness of the bottom 2 of the groove is less than 0.5 mm along the depth direction of the pre-etched groove 3. The depth-to-width ratio of the pre-etched groove 3 is extremely high, that is, the ratio of the depth of the pre-etched groove 3 to the width of the pre-etched groove 3 is large, the volume ratio of the fragment part 1 is higher, the mass is greater, and the destructive power is stronger.

[0062] Optionally, the central axis of the rotating body is perpendicular to the transverse section of the rotating body, and the pre-cut groove 3 in the transverse section of the rotating body is square, U-shaped or V-shaped.

[0063] like Figure 9 As shown, in the transverse cross-section of the rotating body, the pre-cut groove 3 is square, while in some other embodiments, the pre-cut groove 3 is U-shaped or V-shaped.

[0064] Optionally, the central axis of the rotating body is located in the longitudinal section of the rotating body, and the pre-cut groove 3 in the longitudinal section of the rotating body is square, U-shaped or V-shaped.

[0065] like Figure 6 As shown, in the longitudinal section of the rotating body, the pre-cut groove 3 is square, while in some other embodiments, the pre-cut groove 3 is U-shaped or V-shaped.

[0066] This embodiment also provides explosives, which include the casing described above.

[0067] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A housing, characterized in that, The housing includes multiple fragment sections (1) and multiple groove bottoms (2). The multiple fragment sections (1) are arranged at intervals. The space between two adjacent fragment sections (1) is a pre-cut groove (3). Two adjacent fragment sections (1) are connected through the groove bottoms (2). The groove bottoms (2) are located in the depth direction of the pre-cut grooves (3). The density of the fragment sections (1) is greater than the density of the groove bottoms (2).

2. The housing according to claim 1, characterized in that, The shell is a rotating body, and a through hole is provided in the middle of the rotating body.

3. The housing according to claim 2, characterized in that, In the depth direction of the pre-cut groove (3), the opening of the pre-cut groove (3) faces the central axis of the rotating body; Alternatively, in the depth direction of the pre-cut groove (3), the opening of the pre-cut groove (3) is away from the central axis of the rotating body.

4. The housing according to claim 2 or 3, characterized in that, The outer or inner wall of the rotating body is provided with multiple pre-cut grooves (3), some of which are positive spiral grooves and others are negative spiral grooves; The forward spiral groove spirals around the central axis of the rotating body, and the reverse spiral groove spirals around the central axis of the rotating body.

5. The housing according to claim 2 or 3, characterized in that, The outer or inner wall of the rotating body is provided with multiple pre-cut grooves (3), some of which are warp grooves and others are weft grooves; The warp groove extends parallel to the central axis of the rotating body, and the weft groove surrounds the central axis of the rotating body.

6. The housing according to claim 2 or 3, characterized in that, The depth direction of the pre-cut groove (3) is set at an angle to the central axis of the rotating body and the angle is less than 90°.

7. The housing according to claim 6, characterized in that, The width of the pre-cut groove (3) is 0.1-0.2 mm.

8. The housing according to claim 6, characterized in that, Along the depth direction of the pre-cut groove (3), the thickness of the bottom (2) of the groove is less than 0.5 mm.

9. The housing according to claim 2 or 3, characterized in that, The central axis of the rotating body is perpendicular to the transverse section of the rotating body. In the transverse section of the rotating body, the pre-cut groove (3) is square, U-shaped, or V-shaped. And / or, the central axis of the rotating body is located in the longitudinal section of the rotating body, and in the longitudinal section of the rotating body, the pre-cut groove (3) is square, U-shaped or V-shaped.

10. Explosives, characterized in that, The explosive includes a casing as described in any one of claims 1-9.

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