A bullet support for a small-caliber light gas gun firing a heavy metal projectile

Abstract

The present invention relates to a cartridge for launching a heavy metal projectile from a small-caliber light-gas gun, comprising a bottom support part and a projectile-wrapping part; an annular protrusion is arranged on the outer surface of one end of the bottom support part, and the other end is fixedly connected to the projectile-wrapping part; a projectile-receiving cavity is provided along the axis of the projectile-wrapping part, and an interference fit is formed between the projectile and the projectile-receiving cavity, and an internal thread is arranged in the projectile-receiving cavity; an interference fit is formed between the part of the bottom support part where the annular protrusion is arranged and the light-gas gun barrel, and a clearance fit is formed between the rest of the bottom support part and the light-gas gun barrel; a clearance fit is formed between the projectile-wrapping part and the light-gas gun barrel. The cartridge can continuously and adjustably load a heavy metal cylindrical projectile of 1 to 6 g to 1500 to 4000 m / s, and the cartridge has a simple structure and is easy to process, which can reduce the difficulty and cost of experiments.

Description

Technical Field

[0001] The invention belongs to the technical field of hypervelocity impact experiments, and in particular relates to a bullet support for launching a heavy metal projectile from a small-caliber light gas gun. Background Art

[0002] Light gas guns are important experimental platforms in the study of hypervelocity impact damage. The smaller the caliber of the light gas gun, the higher the firing speed. Therefore, using a small-caliber light gas gun with a caliber of less than 10 mm to load the projectile to a hypervelocity and impact the target is an important experimental technology in the study of hypervelocity impact damage effects. Hypervelocity generally refers to a speed greater than 1.5 km / s. During the launch process, the sabot carries the projectile to accelerate, and the sabot must be able to withstand the high acceleration, high temperature, and high stress of the launch process; the sabot plays the role of centering, supporting, and protecting the projectile, and it ensures that the projectile does not come into contact with the launch tube and the high-temperature driving gas; at the same time, the sabot also needs to effectively protect the barrel to avoid scratching the barrel.

[0003] When launching a heavy metal projectile, the load acting on the base is very large. To withstand this load, the current method is to design a complex support structure (especially a strengthening structure of the base) and perform precise support processing. However, due to the small diameter of the barrel of a small-caliber light gas gun, the diameter of the support is small, which means that the complex support structure commonly used in large-caliber gas guns cannot be directly scaled down and applied to small-caliber light gas guns, which brings great difficulties to the design and precision processing of the support.

[0004] Since it is impossible to solve the design and precision processing problems of small-caliber sabots, the sabots of conventional small-caliber light gas guns are cup-shaped sabots. Most small-caliber light gas guns fire low-area-density projectiles, that is, projectiles with low density and small aspect ratio, and cannot fire high-area-density (heavy metal material, large aspect ratio) projectiles. Although small-caliber light gas guns have the advantage of high speed, they can only be used in the fields of space debris protection and fragment protection, and it is difficult to play a greater role in the hypervelocity impact damage effect of heavy metal projectiles.

[0005] Therefore, in order to meet the characteristics of small caliber and large load of the cartridge case when launching heavy metal projectiles from small caliber light gas guns, it is necessary to design a small caliber cartridge case with a simple structure, easy to process, and able to withstand high launch loads. Summary of the invention

[0006] The object of the present invention is to provide a cartridge case for launching a heavy metal projectile of a small-caliber light gas gun, which can continuously and adjustably load a 1-6g heavy metal (tungsten alloy, steel, etc.) cylindrical projectile to 1500-4000m / s, and the cartridge case has a simple structure and is easy to process, thereby reducing the difficulty and cost of experiments.

[0007] The technical solution of the present invention is:

[0008] The present invention provides a cartridge case for launching a heavy metal projectile with a small-caliber light gas gun, wherein the small-caliber refers to a caliber of ≤10 mm; the heavy metal refers to common metals with high density such as steel and tungsten alloy;

[0009] The bullet support comprises a bottom support portion and a bullet body wrapping portion;

[0010] An annular protrusion is arranged on the outer surface of one end of the bottom support part, and the other end is fixedly connected to the projectile body part; the bottom support part is used to bear the launch gas pressure in the gun barrel and push the entire projectile support part to move forward;

[0011] The part that wraps the projectile body is provided with a projectile accommodating cavity along its axis, and the projectile body and the projectile accommodating cavity are interference fit, and an internal thread is provided in the projectile accommodating cavity; the internal thread needs to cooperate with the corresponding external thread on the projectile body, and can withstand the force of the projectile body on the sabot during the launch process. The length of the internal thread can be increased or shortened according to the requirements of the launch load. The internal thread is simple to process, and has a large cross-sectional area that bears the load, which can effectively share the force of the projectile acting on the sabot, and reduce the risk of damage to the sabot in the gun barrel, which is the key to the present invention.

[0012] The portion where the annular protrusion is arranged on the bottom support part is interference fit with the light gas gun barrel. The purpose of the interference fit is to lock the gas and prevent the cartridge case from entering the barrel due to the pulling force generated by the barrel vacuum before firing.

[0013] The rest of the bottom support part and the barrel of the light gas gun are in clearance fit; the wrapped projectile body part and the barrel of the light gas gun are in clearance fit.

[0014] Preferably, the base portion and the elastic body wrapping portion are both made of polycarbonate or nylon material.

[0015] Preferably, the interference between the portion of the bottom support where the annular protrusion is provided and the barrel of the light gas gun is 0.2-0.3 mm.

[0016] Preferably, the gap between the rest of the base portion and the light gas gun barrel, and the gap between the wrapped body portion and the light gas gun barrel are both 0.01-0.03 mm.

[0017] Preferably, the length of the above-mentioned body-wrapping portion is 2 / 3 of the length of the body.

[0018] Preferably, the thickness of the annular protrusion along the axial direction is 1 mm.

[0019] Preferably, the internal thread is a trapezoidal thread.

[0020] The beneficial effects of the present invention are:

[0021] The present invention proposes to use a projectile accommodating cavity to be provided in the projectile-wrapped part, and to provide an internal thread in the projectile-wrapped cavity, so as to share the force of the projectile acting on the sabot through the internal thread, thereby improving the ability of the sabot to resist the launch load of the heavy metal projectile. The invention realizes the continuous and adjustable loading of a 1-6g heavy metal (tungsten alloy, steel, etc.) cylindrical projectile in the range of 1500-4000m / s using a small-caliber two-stage light gas gun. The sabot provided by the present invention has a simple structure and is easy to process, which reduces the difficulty and cost of the experiment. In addition, by changing the length and diameter of the projectile-wrapped part and the internal thread, it can adapt to projectiles of various diameters, lengths and masses, and has good versatility and expansibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of the cartridge case of the present invention;

[0023] Among them, 1-bottom supporting part, 2-body wrapping part, 3-annular protrusion, 4-body containing cavity, 5-internal thread. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in combination with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1

[0026] like Figure 1 As shown, a bullet support for a small-caliber light gas gun to launch a heavy metal projectile comprises: a bottom support portion 1, a projectile body portion 2;

[0027] The inner diameter of the barrel is 7mm, the projectile is a tungsten alloy cylindrical projectile with a length of 6mm and a diameter of 3.5mm, and the mass of the projectile is 1g.

[0028] In this embodiment, the base part is a solid structure, which is 15 mm long and has a diameter 0.01-0.03 mm smaller than the inner diameter of the barrel. There is an annular boss 3 with a thickness of about 1 mm in the axial direction at the tail of the base part 1. The outer diameter of the part of the base part 1 where the annular boss 3 is set is 0.25 mm larger than the inner diameter of the barrel, which is used to hold the air and prevent the cartridge case from entering the barrel due to the pulling force generated by the vacuum of the barrel before firing.

[0029] The projectile-wrapping part 2 is a cylindrical structure, and its outer diameter is 0.01-0.03mm smaller than the inner diameter of the barrel to ensure that the sabot can be smoothly placed in the barrel. The projectile-receiving cavity 4 has an interference fit with the projectile to ensure that the projectile does not move laterally in the barrel. The length of the projectile-wrapping part 2 is 0.7 times the length of the projectile.

[0030] An internal thread 5 is provided in the projectile accommodating cavity 4, and the length of the internal thread 5 can be increased or shortened according to the requirements of the launch load. If the load on the buttstock is large, the length of the internal thread 5 can be equivalent to the length of the wrapped projectile body. If the load on the buttstock is small, the length of the internal thread 5 can even be reduced to 0, which is easier to process and can effectively reduce the difficulty and cost of the experiment. In this example, the length of the internal thread 5 is 4mm, the shape is a trapezoidal thread, and the pitch is 1mm.

[0031] The base portion 1 and the body portion 2 are made of polycarbonate and are integrally formed. The material used effectively reduces the mass of the cartridge case, that is, the passive mass of the launch, while ensuring the strength of the cartridge case, thereby improving the launch efficiency.

[0032] The cartridge case of this embodiment can use a 7mm caliber two-stage light gas gun to launch a heavy metal (tungsten alloy) projectile with a mass of 1g to 4000m / s.

[0033] Embodiment 2

[0034] A bullet support for a small-caliber light gas gun to launch a heavy metal projectile, comprising: a support portion 1, a projectile body portion 2;

[0035] The inner diameter of the barrel is 10mm, the projectile is a tungsten alloy cylindrical projectile with a length of 10mm and a diameter of 5mm, and the mass of the projectile is 3.5g.

[0036] In this embodiment, the bottom support part 1 is a solid structure, which is 20mm long and has a diameter 0.01-0.03mm smaller than the inner diameter of the gun barrel. The tail of the bottom support part 1 has an annular boss 3 with a thickness of about 1mm in the axial direction. The outer diameter of the part where the annular boss 3 is set on the bottom support part 1 is 0.2mm larger than the inner diameter of the gun barrel, which is used to hold air and prevent the cartridge case from entering the gun barrel due to the pulling force generated by the vacuum of the gun barrel before firing.

[0037] The projectile body part 2 is a cylindrical structure, the outer diameter of which is 0.01-0.03mm smaller than the inner diameter of the barrel, and the length of the projectile body part 2 is 0.7 times the length of the projectile.

[0038] The projectile accommodating cavity 4 is provided with an internal thread 5, the length of which can be increased or decreased according to the requirements of the launch load. In this example, the internal thread 5 is 6 mm long, has a trapezoidal thread shape, and has a pitch of 1 mm.

[0039] The base portion 1 and the body portion 2 are made of polycarbonate and are integrally formed. The material used effectively reduces the mass of the cartridge case, that is, the passive mass of the launch, while ensuring the strength of the cartridge case, thereby improving the launch efficiency.

[0040] The cartridge case of this embodiment can use a 10mm caliber two-stage light gas gun to launch a heavy metal (tungsten alloy) projectile with a mass of 3.5g to 3000m / s.

[0041] Example 3

[0042] A bullet support for a small-caliber light gas gun to launch a heavy metal projectile, comprising: a support portion 1, a projectile body portion 2;

[0043] The inner diameter of the barrel is 10mm, the projectile is a tungsten alloy cylindrical projectile with a length of 12mm and a diameter of 6mm, and the mass of the projectile is 6g.

[0044] In this embodiment, the bottom support part 1 is a solid structure, which is 30mm long and has a diameter 0.01-0.03mm smaller than the inner diameter of the gun barrel. The tail of the bottom support part 1 has an annular boss 3 with a thickness of about 1mm in the axial direction. The outer diameter of the part where the annular boss 3 is set on the bottom support part 1 is 0.3mm larger than the inner diameter of the gun barrel, which is used to hold air and prevent the cartridge case from entering the gun barrel due to the pulling force generated by the vacuum of the gun barrel before firing.

[0045] The projectile body part 2 is a cylindrical structure, the outer diameter of which is 0.01-0.03mm smaller than the inner diameter of the barrel, and the length of the projectile body part 2 is 0.7 times the length of the projectile.

[0046] The projectile accommodating cavity 4 is provided with an internal thread 5, the length of which can be increased or decreased according to the requirements of the launch load. In this example, the internal thread 5 is 8 mm long, has a trapezoidal thread shape, and has a pitch of 1 mm.

[0047] The material of the sabot is polycarbonate. While ensuring the strength of the sabot, the material effectively reduces the mass of the sabot, that is, the passive mass of the launch, which can improve the launch efficiency.

[0048] The cartridge case in this example can use a 10mm caliber two-stage light gas gun to launch a 6g heavy metal (tungsten alloy) projectile to 2500m / s.

[0049] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A cartridge case for launching a heavy metal projectile from a small-caliber light gas gun, characterized in that: It comprises a base portion (1) and a body-wrapping portion (2); An annular protrusion (3) is provided on the outer surface of one end of the base portion (1), and the other end is fixedly connected to the wrapped elastic body portion (2); The part wrapping the elastic body (2) is provided with an elastic body accommodating cavity (4) along its axis, the elastic body and the elastic body accommodating cavity are in interference fit, an internal thread (5) is provided in the elastic body accommodating cavity (4), and the internal thread (5) is a trapezoidal thread; The portion of the bottom support part (1) where the annular protrusion is provided has an interference fit with the light gas gun barrel; the remaining portion of the bottom support part (1) has a clearance fit with the light gas gun barrel, and the portion wrapping the projectile body (2) has a clearance fit with the light gas gun barrel, and the clearances are all 0.01-0.03 mm.

2. The bullet support for launching heavy metal projectiles by a small-caliber light gas gun according to claim 1, characterized in that: The base portion (1) and the elastic body portion (2) are both made of polycarbonate or nylon material.

3. The bullet support for launching heavy metal projectiles by a small-caliber light gas gun according to claim 1, characterized in that: The interference between the portion of the bottom support (1) where the annular protrusion (3) is provided and the barrel of the light gas gun is 0.2-0.3 mm.

4. The bullet support for launching heavy metal projectiles by a small-caliber light gas gun according to claim 1, characterized in that: The length of the part (2) wrapping the projectile body is 2 / 3 of the length of the projectile body.

5. The bullet support for launching heavy metal projectiles by a small-caliber light gas gun according to claim 1, characterized in that: The thickness of the annular protrusion (3) along the axial direction is 1 mm.

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