CN108731550B

CN108731550B - Super energy-gathering linear cutter

Info

Publication number: CN108731550B
Application number: CN201810535339.XA
Authority: CN
Inventors: 张树海; 苟瑞君; 陈亚红
Original assignee: North University of China
Current assignee: North University of China
Priority date: 2018-05-30
Filing date: 2018-05-30
Publication date: 2020-06-23
Anticipated expiration: 2038-05-30
Also published as: CN108731550A

Abstract

The invention relates to the field of blasting equipment, in particular to a super-energy-gathering linear cutter. Including the shell that is cover shape structure, the longitudinal section is the main medicine type cover of the type structure of falling of truncation V, and the longitudinal section is the supplementary medicine type cover of rectangle structure, supplementary medicine type cover is located the type opening part of falling of truncation of main medicine type cover along the extending direction cover of shell, and the type bottom of falling of truncation of main medicine type cover forms inclosed cavity jointly along the extending direction and the shell bottom of shell, shell inner wall, main medicine type cover and supplementary medicine type cover, and is filled with the explosive in this cavity. Compared with the traditional linear cutter, the novel linear cutter has the advantages that the proportion of the part of the main medicine type cover material forming the jet knife is larger, the jet speed is higher, and the speed gradient inside the jet knife is smaller, so that the jet knife is higher in mass and speed, is less prone to fracture, and has a better cutting effect.

Description

Super energy-gathering linear cutter

Technical Field

The invention relates to the field of blasting equipment, in particular to a super-energy-gathering linear cutter.

Background

Shaped charge refers to an explosive charge having a cavity at one end, the cavity typically being lined with a metal liner (called a liner). Detonation from the opposite end to the cavity creates a converging high temperature and pressure gas stream (no liner) or metal jet (liner) at the cavity, causing damage to the target. The above effect is called a hole energy accumulation effect. Shaped charges are widely used in various military and civil fields, such as military armor-piercing bullets, perforating bullets in civil explosive fields, shaped cutters and the like. The shaped cutter mainly has various forms such as a linear cutter, a ring cutter (such as a patent CN 102735121A), a cutting rope (such as a patent CN 202255149U) and the like. Linear cutters based on shaped charge are widely used in the fields of rock cutting, projectile disassembly, underwater cutting and the like. The shaped charge portion of a conventional linear cutter generally employs a single metal liner with a wedge-shaped cross-section (or referred to as V-shaped, inverted V-shaped, and hereinafter collectively referred to as "inverted V-shaped"), which simultaneously forms a large pestle when forming a metal jet cutter, and is not high in energy and material utilization rates.

The cutting effect of the cutter is improved by changing the type and shape of explosive, the initiation mode and position, the liner material and shape, the explosive height and the like, such as patents CN107091600A, CN202522147U, CN102918351A, CN104457464A, CN1752752 and the like. The techniques and methods have respective application ranges and applicable conditions, and the formed jet knife still has limitations, such as large mass of a pestle body part, small mass of a jet knife part, low head speed, easy breaking and the like, thereby limiting the cutting depth.

Disclosure of Invention

The invention provides a super energy-gathering linear cutter for solving the defects of large mass of a pestle body part, small mass of a jet flow knife part, low head speed, easiness in breaking, small cutting depth and the like of the conventional linear energy-gathering charge structure.

The invention is realized by the following technical scheme: a super energy-gathering linear cutter comprises a housing in a hood-shaped structure, a main medicine type hood with a longitudinal section in a truncated inverted V-shaped structure, an auxiliary medicine type hood with a longitudinal section in a rectangular structure,

the auxiliary medicine type cover is arranged at the truncated inverted V-shaped opening of the main medicine type cover along the extending direction of the shell, the truncated inverted V-shaped bottom of the main medicine type cover is in closed fit with the bottom of the shell along the extending direction of the shell, the two ends of the length direction of the main medicine type cover are in butt joint with the inner walls of the two ends of the length direction of the shell, the two ends of the length direction of the auxiliary medicine type cover are in butt joint with the inner walls of the two ends of the length direction of the shell, a truncated inverted V-shaped notch matched with the truncated inverted V-shaped of the main medicine type cover is formed in the shell at the two ends of the length direction of the shell, the shell inner wall, the main medicine type cover and the auxiliary medicine type cover form a closed cavity together.

As a further improvement of the technical scheme of the invention, the vertical central plane of the main medicine type cover and the vertical central plane of the auxiliary medicine type cover are positioned in the same vertical plane.

As a further improvement of the technical scheme of the invention, the thickness of the auxiliary shaped-drug cover is 2-3 times of that of the main shaped-drug cover, and the width of the auxiliary shaped-drug cover is 1.2-1.6 times of the width of the inverted V-shaped truncated opening of the main shaped-drug cover.

As a further improvement of the technical scheme of the invention, the impact resistance of the material for manufacturing the auxiliary shaped-drug cover is larger than that of the material for manufacturing the main shaped-drug cover.

As a further improvement of the technical scheme of the invention, the cross section of the shell is of a reversed-right-angle U-shaped structure, and the corner part of the top part is of a chamfered structure.

According to the invention, by adding the auxiliary shaped charge cover, the speed of the jet cutter is effectively increased under the condition of not increasing the dosage, the pestle body is reduced, and the cutting effect is improved. The jet flow of different sections of the linear cutter forms a jet flow knife along the longitudinal direction to finish the cutting task. Compared with the traditional linear cutter, the novel linear cutter has the advantages that the proportion of the part of the main medicine type cover material forming the jet knife is larger, the jet speed is higher, and the speed gradient inside the jet knife is smaller, so that the jet knife is higher in quality, higher in speed, less prone to fracture, and better in cutting effect (larger in cutting depth, better in incision continuity and smoother in section).

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a longitudinal cross-sectional view of a super-concentrating linear cutter according to the present invention.

In the figure: 1-shell, 2-explosive, 3-auxiliary shaped charge liner and 4-main shaped charge liner.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

A super energy-gathering linear cutter comprises a shell 1 with a cover-shaped structure, a main medicine type cover 4 with a truncated inverted V-shaped structure on the longitudinal section, an auxiliary medicine type cover 3 with a rectangular structure on the longitudinal section, wherein the auxiliary medicine type cover 3 covers the truncated inverted V-shaped opening of the main medicine type cover 4 along the extension direction of the shell 1, the truncated inverted V-shaped bottom of the main medicine type cover 4 is in close fit with the bottom of the shell 1 along the extension direction of the shell 1, the two ends of the length direction of the main medicine type cover 4 are in butt joint with the inner walls of the two ends of the length direction of the shell 1, the two ends of the length direction of the auxiliary medicine type cover 3 are in butt joint with the inner walls of the two ends of the length direction of the shell 1, truncated inverted V-shaped notches (the inner shape and the outer shape are the same) matched with the truncated inverted V-shaped structure of the main medicine type cover 4 are arranged on the shells at the two ends of the length direction of the shell, and the cavity is filled with an explosive 2.

In the present invention, the main drug-shaped mask 4 is a truncated inverted V-shaped mask. The parameters of material, apex angle, wall thickness, etc. of the truncated inverted V shaped liner were consistent with the design of a conventional linear cutter charge, except that the inverted V shaped liner was truncated approximately 1/4 near the apex, and the remainder was used. In addition, the truncated inverted V-shaped structure means that the top of the inverted V-shaped structure is removed, and the top forms an open structure.

In particular, the housing 1 of the actual super-energy concentrating linear cutter should be of a certain length according to a particular cutting target, or be pre-manufactured to a certain length. The shell 1 is provided with an initiating device such as a detonator or a detonating cord, an initiating network and the like, and is connected with the explosive 2 through a hole on the shell 1. The arrangement may be a top single point detonation, a multiple point detonation or a line detonation, or an end point detonation. Taking top line initiation as an example, after initiation, detonation waves are formed inside the explosive 2, and collapse of the auxiliary shaped charge liner 3 is realized. The detonation wave firstly reaches the upper surface of the auxiliary shaped charge liner 3, the explosion shock wave is transmitted into the auxiliary shaped charge liner 3 and deforms, the explosives 2 on the two sides of the auxiliary shaped charge liner 3 continue to detonate, and the propagation direction of the detonation wave deflects. Compared with the traditional liner structure, the propagation direction of the detonation wave is closer to the vertical direction of the wall of the main drug liner 4, so the forward crushing component acting on the main drug liner 4 is increased, and the speed of the drug liner micro element is increased. According to the metal jet forming principle, the medicine cover microelements move along the axis after colliding with each other on the axis, and the momentum is conserved after the collision, so that the forward metal jet and the backward pestle body are generated. Because the collision speed of the medicine cover micro-element is increased compared with the traditional medicine cover, the speed of the formed jet flow is also increased.

Preferably, the vertical central plane of the main drug-shaped cover 4 and the vertical central plane of the auxiliary drug-shaped cover 3 are located in the same vertical plane.

Further, the thickness of the auxiliary liner 3 is 2-3 times of that of the main liner 4, and the width of the auxiliary liner 3 is 1.2-1.6 times of that of the inverted V-shaped truncated opening of the main liner 4.

Further, the impact resistance of the material of the auxiliary liner 3 is larger than that of the material of the main liner 4. The efficiency of the transfer of energy due to the detonation waves during the interaction with the auxiliary liner 3 or the main liner 4 is related to the impact resistance of the

liners

3 and 4. The principle of the interaction between the shock wave and the condensed medium shows that the greater the impact resistance of the material, the greater the impulse obtained by the material under the same detonation wave action, and thus the greater its momentum (and at the same time its kinetic energy). Since the impact resistance of the auxiliary liner 3 is greater than that of the main liner 4, the energy obtained from the explosive is greater than that obtained by using only the main liner 4. Meanwhile, the shape and the position of the auxiliary liner 3 are higher than those of the traditional liner in the efficiency of converting detonation wave energy. The auxiliary liner 3 which obtains a large amount of kinetic energy pushes the main liner 4 to obtain more kinetic energy, and simultaneously prevents the tail part of the main liner from forming a pestle body, thereby improving the speed and the material utilization rate of the jet formed by the main liner 4 and reducing the speed gradient in the jet. If the main liner 4 is made of a metal such as aluminum, iron, or copper, or an alloy of two or more of these metals, the corresponding auxiliary liner 3 is made of a metal such as iron or tungsten, or an alloy of two or more of these metals, which has a higher impact resistance than that of the metal.

As shown in fig. 1, the section of the housing 1 is a U-shaped structure with a chamfer angle, and the corner of the top is a chamfer angle structure (chamfer angle processing).

The technical solution of the present invention will be described below by way of specific examples.

Example 1

The super-energy linear cutter is manufactured as shown in fig. 1, and the specific parameters are as follows: the length of the shell 1 is 303mm, the width is 33mm, the height is 47mm, the wall thickness is 1.5mm, the upper part is provided with 2 symmetrical chamfers of 45 degrees at the left and the right, the side length of each chamfer is 12mm, and the material is aluminum; selecting a certain explosive (the detonation velocity is 7980 m/s) from the explosive 2, wherein the total explosive amount is 340 g; the main drug type cover 4 is divided into two left and right symmetrical pieces, the thickness is 1.5mm, the included angle between the main drug type cover 4 and the side surface of the shell 1 is 30 degrees, the material is aluminum, the main drug type cover 4 and the shell 1 can be integrally formed by punching and processing aluminum plates, the top parts of the two main drug type covers 4 are processed into a horizontal plane, and the distance between the horizontal plane and the plane where the cover openings are located is 22.5 mm; (ii) a The width of the auxiliary shaped liner 3 is 14mm, the thickness is 4mm, the material is low carbon steel, and the lower surface of the auxiliary shaped liner is jointed with the upper horizontal surface of the main shaped liner 4; the end face of the electric detonator is detonated, and the explosion height is 40 mm. A45 # steel target cutting test is carried out, the cutting depth is 35 mm-39 mm, and the cutting depth of a linear cutter without the auxiliary liner 3 is 28 mm-33 mm. The novel cutter has the advantages that the cutting performance is improved by about 20%, the cut continuity is better, and the section is smoother.

Example 2

As shown in FIG. 1, the specific parameters of the super-energy linear cutter are as follows: the length of the shell 1 is 243mm, the width is 43mm, the height is 57mm, the wall thickness is 1.5mm, the upper part is provided with 2 symmetrical chamfers of 45 degrees at the left and the right, the side length of each chamfer is 14mm, and the material is aluminum; selecting a certain explosive (detonation velocity of 6930 m/s) from the explosive 2, wherein the total explosive amount is 477 g; the main drug type cover 4 is divided into two left and right symmetrical pieces, the thickness is 1.5mm, the included angle between the main drug type cover 4 and the side surface of the shell 1 is 25 degrees, the material is aluminum, the main drug type cover 4 and the shell 1 can be integrally formed by punching and processing aluminum plates, the top parts of the two main drug type covers 4 are processed into a horizontal plane, and the distance between the horizontal plane and the plane where the cover openings are located is 35 mm; the width of the auxiliary shaped liner 3 is 10mm, the thickness is 3mm, the material is low carbon steel, and the lower surface of the auxiliary shaped liner is jointed with the upper horizontal surface of the main shaped liner 4; the center line of the upper surface is detonated. The jet formed had a steady velocity of about 4100 m/s. By contrast, the jet steady velocity of the traditional unaided liner charge is about 3700m/s, and the jet velocity of the new structure is improved by about 10%.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A super energy-gathering linear cutter is characterized by comprising a shell (1) in a cover-shaped structure, a main medicine type cover (4) with a longitudinal section in a truncated inverted V-shaped structure, an auxiliary medicine type cover (3) with a longitudinal section in a rectangular structure,

the auxiliary shaped charge cover (3) is arranged at the truncated inverted V-shaped opening of the main shaped charge cover (4) along the extending direction of the shell (1), the truncated inverted V-shaped bottom of the main shaped charge cover (4) is in close fit with the bottom of the shell (1) along the extending direction of the shell (1), the two ends of the main shaped charge cover (4) in the length direction are in butt joint with the inner walls of the two ends of the shell (1) in the length direction, the two ends of the auxiliary shaped charge cover (3) in the length direction are in butt joint with the inner walls of the two ends of the shell (1) in the length direction, the shells at the two ends of the shell (1) in the length direction are provided with truncated inverted V-shaped notches matched with the truncated inverted V-shaped of the main shaped charge cover (4), the inner wall of the shell (1), the main shaped charge cover (4) and the auxiliary shaped charge cover (3) form a closed cavity together, and the explosive; the thickness of the auxiliary shaped-drug cover (3) is 2-3 times of that of the main-drug cover (4), and the width of the auxiliary shaped-drug cover (3) is 1.2-1.6 times of the width of the inverted-V-shaped truncated opening of the main-drug cover (4); the impact resistance of the material of the auxiliary liner (3) is greater than that of the material of the main liner (4).