Light composite centering structure design suitable for sub-caliber launching balance gun

Abstract

The invention belongs to the technical field of ballistic tests, and relates to a light composite centering structure design suitable for a sub-caliber launching balance gun, which comprises a front centering part, an aluminum connecting ring and an aluminum rear centering part, the front centering part is in threaded connection with the front section of the projectile body from front to back, the aluminum connecting ring is in threaded connection with the tail of the projectile body from back to front, the aluminum rear centering part is in threaded connection with an outer ring of the aluminum connecting ring from back to front, and the groove bottom of an annular groove of the aluminum rear centering part tightly abuts against the end face of the tail of the projectile body from back to front; according to the invention, the projectile body can obtain a higher speed under the condition of the same propellant amount, and meanwhile, the application of the aluminum alloy is also beneficial to reducing the production cost; compared with the direct connection of the rear centering part and the projectile body, the aluminum connecting ring structure can enable the rear centering part to fall off more easily after the rear centering part is out of the gun muzzle, so that the influence of the falling-off process on the trajectory is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of ballistic testing and relates to a lightweight composite centering structure design suitable for a sub-caliber launch balance gun. Background Art

[0002] A balanced gun is a smoothbore, recoilless gun that utilizes a counterweight to counteract the recoil generated during firing. Its hallmark is that the forces acting along the barrel axis are essentially balanced, and the gun carriage carries minimal load, allowing for a large caliber. It is a relatively mature testing and loading tool for large, high-mass test pieces, such as earth-penetrating weapons and other large penetrating warheads. Subcaliber firing technology is commonly employed in warhead development testing based on balanced guns. Subcaliber firing plays a crucial role in weapon warhead development. It is not only a necessary technical means for conducting penetration tests of projectiles of varying calibers using balanced guns as a loading platform, but also an important method for improving projectile muzzle velocity and penetration capability.

[0003] The auxiliary parts for balanced gun sub-caliber firing tests consist of a rear centering assembly connected to the rear end of the warhead and a front centering piece covering the warhead's center of mass. The rear centering assembly directly bears the effects of high-temperature and high-pressure gunpowder gases to protect components such as the fuze within the warhead. Furthermore, smooth shell removal is required to avoid adding additional mass to the projectile, which directly affects ballistic performance and penetration effectiveness. The front centering piece primarily serves a centering and guiding function. After assembly with the warhead, the center of mass of the warhead is ensured to be located between the front centering piece and the rear centering assembly to prevent up and down vibrations of the warhead as it moves within the bore, which could cause a jam or unstable trajectory. Before impacting the target, the front centering piece, like the rear centering assembly, must be shelled; otherwise, the additional mass of the projectile will be increased, directly affecting ballistic performance and target penetration effectiveness.

[0004] However, existing centering components have significant deficiencies in the experimental design and manufacturing of large-caliber balanced guns. With the rise in armor protection levels, the demand for increased power in large-caliber armor-piercing discarding sabot rounds is also increasing. As a component of the projectile, the centering assembly primarily ensures the proper function of the projectile within the barrel, ensures the sealing of the propellant gases during operation, and enhances the projectile's ballistic flight stability. When conducting penetration tests using balanced guns, the centering assembly faces several requirements: It must withstand the high overload of the propellant gases within the barrel to prevent material deformation; it must also coordinate harmoniously with the projectile body within the barrel to ensure uniform force distribution within the barrel, while the discarding sabot assembly must also properly mate with the inner wall of the barrel to prevent air leaks and scratches. The mass of the centering assembly, also known as negative mass, is crucial for improving the range and power of projectiles. Traditional integrated alloy steel structural designs cannot meet the requirements of modern weapons research.

[0005] Therefore, a support structure is needed to solve the above technical problems while ensuring structural strength and further reducing the overall mass. Summary of the Invention

[0006] The present invention aims to provide a sub-caliber balanced gun experimental centering composite structure, which reduces the negative mass while increasing the initial penetration velocity of the projectile, while ensuring that the overall structure does not deform during the firing process, and has the characteristics of being lightweight and easy to fall off.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a lightweight composite centering structure design suitable for sub-caliber launch balance gun, including: a front centering part, an aluminum connecting ring, and an aluminum rear centering part;

[0008] The front centering portion is in the shape of a ring, and the inner ring of the front centering portion is provided with a front centering portion connecting thread, which matches the external thread on the outer circumference of the front end of the projectile;

[0009] The aluminum connecting ring is in a circular shape, the inner ring of the aluminum connecting ring is provided with an aluminum connecting ring internal thread, the outer ring of the aluminum connecting ring is provided with an aluminum connecting ring external thread, and the aluminum connecting ring internal thread matches the external thread on the outer circumference of the tail of the projectile;

[0010] The aluminum rear centering part is in the shape of a circular groove, and the annular inner ring of the circular groove of the aluminum rear centering part is provided with an aluminum rear centering part thread, and the aluminum rear centering part thread matches the external thread of the aluminum connecting ring;

[0011] The front centering part is threadedly connected to the front section of the projectile from front to back, the aluminum connecting ring is threadedly connected to the tail of the projectile from back to front, the aluminum rear centering part is threadedly connected to the outer ring of the aluminum connecting ring from back to front, and the bottom of the circular ring groove of the aluminum rear centering part presses against the tail end face of the projectile from back to front;

[0012] The front centering part is threadedly connected to the front section of the projectile body and plays a connecting role during the launch process. After hitting the target plate, the thread breaks and fails, and the cartridge case is successfully separated. The aluminum connecting ring and the aluminum rear centering part are light in weight and can be easily damaged and fallen off by stretching, reducing the impact of the falling off of the aluminum connecting ring and the aluminum rear centering part components on the projectile body.

[0013] Preferably, a circular steel baffle is provided at the bottom of the annular groove of the aluminum rear centering portion, and the front and rear surfaces of the steel baffle are respectively in contact with the tail end surface of the projectile and the bottom of the annular groove of the aluminum rear centering portion;

[0014] A circular steel cover plate is provided on the end surface of the aluminum rear centering portion away from the projectile body, and the steel cover plate is in contact with the end surface of the aluminum rear centering portion;

[0015] The steel baffle is in direct contact with the tail of the projectile, converting the thrust into the power of the projectile during the launch process; the steel cover plate converts the impact force of the gunpowder into the thrust of the projectile, while ensuring that no damage or yield fracture occurs during the launch process and plays a role in protecting the aluminum connecting ring and the aluminum rear centering part.

[0016] More preferably, an air-sealing ring is provided on the outer cylindrical surface of the aluminum rear centering portion, the air-sealing ring is in a circular shape and is made of nylon material;

[0017] The outer cylindrical surface of the aluminum rear centering part is in the shape of a stepped shaft with a thickness at the front and a thickness at the rear. The air-closing ring is sleeved from the rear to the front on the thin section of the stepped shaft of the outer cylindrical surface of the aluminum rear centering part. The front end face of the air-closing ring is pressed tightly against the end face of the thick section of the stepped shaft of the outer cylindrical surface of the aluminum rear centering part. The outer diameter of the air-closing ring is larger than the outer diameter of the aluminum rear centering part and the outer diameter of the steel cover plate.

[0018] The gas sealing ring forms an interference fit with the inner wall of the barrel, ensuring a closed environment for the emission gas, while reducing the barrel wear caused by direct contact between the outer circumference of the front centering part and the aluminum rear centering part and the barrel.

[0019] More preferably, the aluminum rear centering part is provided with an aluminum rear centering part connecting hole on the end face away from one end of the projectile body, and a steel cover plate connecting hole is provided on the steel cover plate, and the steel cover plate connecting hole is a through hole; the hole position of the aluminum rear centering part connecting hole corresponds one to one to the hole position of the steel cover plate connecting hole; it is used to fix the steel cover plate to the rear end face of the aluminum rear centering part, thereby providing better protection for the aluminum rear centering part during firing.

[0020] Preferably, a front centering portion weight-reducing through hole is provided on the front centering portion; the weight-reducing through hole can reduce the mass of the front centering portion, and at the same time reduce the front contact area between the front centering portion and the air during launch, thereby reducing air resistance.

[0021] More preferably, the front centering portion weight-reducing through hole is an arc-shaped hole or an isosceles trapezoidal hole, and there are multiple front centering portion weight-reducing through holes, which are evenly distributed around the circumference on the end face of the front centering portion.

[0022] More preferably, a front centering portion reinforcing rib is provided radially between two adjacent front centering portion weight-reducing through holes.

[0023] Preferably, an outer chamfer of the front centering part is provided at the intersection of the end face of the front centering part facing the firing direction and the outer cylindrical surface; an outer chamfer of the aluminum rear centering part is provided at the intersection of the end face of the aluminum rear centering part facing the firing direction and the outer cylindrical surface; the chamfer is beneficial to the direction of the projectile entering the barrel, thereby achieving the purpose of quickly installing the projectile.

[0024] Preferably, the inner ring of the front centering portion is provided with a front centering portion positioning boss protruding radially inward, the front centering portion positioning boss is located at the front end of the inner ring of the front centering portion, the front centering portion connecting thread is located at the rear end of the inner ring of the front centering portion, and the height of the front centering portion positioning boss protruding radially inward is higher than the crest of the front centering portion connecting thread;

[0025] The inner ring of the aluminum connecting ring is provided with an aluminum connecting ring positioning boss protruding radially inward, the aluminum connecting ring positioning boss is located at the rear end of the inner ring of the aluminum connecting ring, the internal thread of the aluminum connecting ring is located at the front end of the inner ring of the aluminum connecting ring, and the height of the aluminum connecting ring positioning boss protruding radially inward is higher than the crest of the internal thread of the aluminum connecting ring;

[0026] The front centering part positioning boss and the aluminum connecting ring positioning boss first facilitate positioning during assembly, and then convert the explosive thrust into projectile acceleration as much as possible during launch.

[0027] Preferably, an aluminum connecting ring mounting hole is provided on the end face of the aluminum connecting ring, and the rotation axis of the aluminum connecting ring mounting hole is parallel to the rotation axis of the aluminum connecting ring; the aluminum connecting ring mounting hole is used to assist the staff to quickly adjust the installation during installation.

[0028] The beneficial effects of the present invention are:

[0029] The front and rear centering parts of the present invention adopt split supports, which effectively reduce the deflection torque of the projectile in the bore and improve the axial consistency of the in-bore firing; the front centering adopts a trapezoidal through hole and reinforcing rib design, which reduces the action surface of air resistance and reduces the influence of air resistance on the movement of the projectile; the rear centering part assembly adopts a composite sandwich structure design of steel baffle-aluminum-steel cover plate, and the front and rear steel structures ensure that the rear centering part has sufficient support strength. At the same time, the aluminum rear centering part of the middle layer not only reduces the overall consumable mass, but also enables the projectile to obtain a higher speed with the same amount of propellant. At the same time, the use of aluminum alloy also helps to reduce production costs; compared with the direct connection between the rear centering part and the projectile, the aluminum connecting ring structure can make the rear centering easier to fall off after leaving the muzzle, thereby reducing the influence of the falling process on the trajectory. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a centering and projectile body of a lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to the present invention;

[0031] Figure 2 It is a schematic structural diagram of the front centering portion of the present invention;

[0032] Figure 3 It is a front elevation view of the front centering portion of the present invention;

[0033] Figure 4 yes Figure 3 AA cross-section of

[0034] Figure 5 It is a schematic structural diagram of the aluminum connecting ring of the present invention;

[0035] Figure 6 yes Figure 5 sectional view of

[0036] Figure 7 It is a schematic diagram of the steel baffle structure of the present invention;

[0037] Figure 8 This is a schematic structural diagram of the aluminum rear centering portion of the present invention;

[0038] Figure 9 yes Figure 8 sectional view of

[0039] Figure 10 It is a structural schematic diagram of the steel cover plate of the present invention.

[0040] In the figure, 1. front centering part; 2. projectile; 3. aluminum connecting ring; 4. aluminum rear centering part; 5. steel baffle; 6. air-sealing ring; 7. steel cover plate; 8. outer chamfer of front centering part; 9. weight-reducing through hole of front centering part; 10. reinforcing rib of front centering part; 11. connecting thread of front centering part; 12. positioning boss of front centering part; 13. outer thread of aluminum connecting ring; 14. inner thread of aluminum connecting ring; 15. positioning boss of aluminum connecting ring; 16. mounting hole of aluminum connecting ring; 17. thread of aluminum rear centering part; 18. outer chamfer of aluminum rear centering part; 19. connecting hole of aluminum rear centering part; 20. connecting hole of steel cover plate. DETAILED DESCRIPTION

[0041] The following will provide a clear and complete description of the relevant technologies in the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] This embodiment is suitable for the design of a lightweight composite centering structure for a sub-caliber launch balance gun, wherein the front centering portion 1 is connected and fixed to the front portion of the projectile body 2 via a front centering portion connecting thread 11, and the tail section of the projectile body 2 is connected and fixed to the aluminum rear centering portion 4 and its related components via an aluminum connecting ring internal thread 14.

[0043] Among them, the outer chamfer 8 of the front centering part can eliminate burrs generated during machining and reduce damage to the inner wall of the barrel. At the same time, it also facilitates the adjustment of the direction of the front centering part into the balance gun to achieve the purpose of rapid installation.

[0044] Among them, the front centering part weight-reducing through-holes 9 are eight trapezoidal weight-reducing holes arranged circumferentially in a uniform distribution manner. When the projectile 2 accelerates in the bore, the front centering part 1 will be affected by the air resistance due to the compression of the air in front. The weight-reducing through-hole structure helps to reduce the mass of the front centering part on the one hand, and on the other hand, it reduces the front contact area between the front centering part and the air, allowing the air to flow smoothly, which helps to reduce the air resistance.

[0045] Among them, the design of the front centering part reinforcement rib 10 can improve the structural strength of the front centering part 1 under strong impact loads, ensure the integrity of the front centering part 1 in the balanced barrel, and ensure that the projectile 2 does not tilt due to the center of mass weight when moving in the barrel, thereby ensuring the accuracy of the incident angle when the projectile 2 penetrates the target plate.

[0046] Among them, the front centering connecting thread 11 adopts M240×2-7H fine thread, which is threadedly matched with the thread of the projectile body 2. It mainly plays a connecting role in the entire launching process. When the projectile body 2 hits the target plate, the thread breaks and fails under the action of strong shear force, which can smoothly realize the separation of the cartridge case and reduce the impact on the penetration performance of the projectile body 2.

[0047] The front centering portion positioning boss 12 is only 2mm high and is located at the front end of the front centering portion connecting thread 11, making it easier for the operator to determine the assembly position and position during assembly. It also prevents the projectile body 2 from slipping off the front centering portion 1 during movement within the chamber.

[0048] Among them, the external thread 13 of the aluminum connecting ring adopts M250×2-6g fine pitch thread, which is matched with the thread 17 of the aluminum rear centering part to connect the aluminum connecting ring 3 and the aluminum rear centering part 4.

[0049] Among them, the internal thread 14 of the aluminum connecting ring adopts M236×2-7H fine thread, which cooperates with the connecting thread at the tail of the projectile 2 to fix the aluminum connecting ring 3 to the projectile 2. The aluminum connecting ring 3 is made of lightweight aluminum alloy material. Under the condition of the same volume, the mass is much smaller than that of alloy steel material. At the same time, the strength of aluminum alloy is low. During the process of the projectile 2 penetrating out of the barrel, the aluminum connecting ring 3 is more likely to be stretched and damaged to fall off, thereby reducing the impact of the aluminum rear centering part 4 component falling off on the projectile 2.

[0050] The aluminum connecting ring's positioning boss 15 is 2mm high and 10mm wide. This boss facilitates positioning during assembly and, in turn, mates with the steel baffle 5, nesting it between the projectile 2 and the aluminum rear centering portion 4. Made of 30CrMnSiA high-strength alloy steel, the steel baffle 5 comes into direct contact with the rear of the projectile 2. It is a crucial component for converting thrust into acceleration during launch, and therefore requires sufficient strength.

[0051] The aluminum connecting ring mounting holes 16 are two M8 threaded holes, and their main function is to assist the staff in quickly adjusting the installation when installing the projectile 2 and the aluminum connecting ring 3 .

[0052] Among them, the outer chamfer 18 of the aluminum rear centering part is set on the end face of the aluminum rear centering part 4 facing the head of the projectile 2, which facilitates the aluminum rear centering part 4 to quickly adjust its direction and accurately enter the balance gun, saving installation time, reducing friction resistance during assembly, and optimizing the assembly process.

[0053] The diameter of the steel cover plate 7 is slightly smaller than that of the aluminum rear centering portion 4. Eight steel cover plate connection holes 20 are arranged in a circular pattern around the edge of the steel cover plate 7, corresponding one-to-one with the aluminum rear centering portion connection holes 19 on the aluminum rear centering portion 4. The steel cover plate connection holes 20 are threaded through holes. The steel cover plate 7 is constructed of 30CrMnSiA high-strength alloy steel. As a structural component directly exposed to the explosive gas impact, it is also a crucial component for converting the explosive gas impact force into thrust for the projectile 2. Therefore, it must be protected from damage and yield fracture during launch. Using high-strength alloy steel effectively meets these design requirements.

[0054] Among them, the gas-closing ring 6 is installed between the connection between the aluminum rear centering part 4 and the steel cover plate 7. The gas-closing ring 6 is a ring made of nylon material. Under prestress, the gas-closing ring 6 is nested in the rear end face boss of the aluminum rear centering part 4. The outer diameter of the gas-closing ring 6 is larger than the maximum outer circumferential diameter of the aluminum rear centering part 4 and the front centering part 1. The enlarged diameter nylon belt of the gas-closing ring 6 can form an interference fit with the inner wall of the gun barrel to ensure a closed environment for the launch gas, and can also effectively avoid the loss caused by direct contact between the front / rear centering part and the gun barrel.

[0055] The key technical points in this embodiment are: First, the front centering part adopts a weight-reducing through-hole design to achieve lightweight large-caliber centering structure. Second, the front centering part adopts a reinforcing rib structure design to improve the structural strength and reliability of the centering part. Third, the rear centering part adopts a composite sandwich structure design of steel baffle-aluminum-steel cover plate, which reduces the consumable weight and production cost of the rear centering part while ensuring the structural strength of the rear centering part. Fourth, the rear centering part adopts an aluminum connecting ring design, so that during the falling-off process of the rear centering part, shear failure mainly occurs at the aluminum connecting ring, thereby reducing the impact of shear failure on the projectile itself, further reducing the impact on the test trajectory, and making the experimental results closer to the actual application scenario.

[0056] In summary, the present invention can enable the projectile to achieve a higher speed with the same amount of propellant, and the use of aluminum alloy also helps to reduce production costs; compared with the direct connection between the rear centering part and the projectile, the aluminum connecting ring structure can make the rear centering part easier to fall off after leaving the muzzle, thereby reducing the impact of the falling process on the trajectory.

[0057] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A lightweight composite centering structure design suitable for sub-caliber launch balance guns, characterized by: include: Front centering part (1), aluminum connecting ring (3), aluminum rear centering part (4); The front centering portion (1) is in the shape of a ring, and the inner ring of the front centering portion (1) is provided with a front centering portion connecting thread (11), and the front centering portion connecting thread (11) matches the external thread on the outer circumference of the front end of the body (2); The aluminum connecting ring (3) is in the shape of a ring, the inner ring of the aluminum connecting ring (3) is provided with an aluminum connecting ring internal thread (14), the outer ring of the aluminum connecting ring (3) is provided with an aluminum connecting ring external thread (13), and the aluminum connecting ring internal thread (14) matches the external thread on the outer circumference of the tail of the projectile (2); The aluminum rear centering portion (4) is in the shape of a circular groove, and the annular inner ring of the circular groove of the aluminum rear centering portion (4) is provided with an aluminum rear centering portion thread (17), and the aluminum rear centering portion thread (17) matches the aluminum connecting ring external thread (13); The front centering portion (1) is threadedly connected to the front section of the body (2) from front to back, the aluminum connecting ring (3) is threadedly connected to the tail of the body (2) from back to front, the aluminum rear centering portion (4) is threadedly connected to the outer ring of the aluminum connecting ring (3) from back to front, and the bottom of the circular groove of the aluminum rear centering portion (4) is pressed against the tail end face of the body (2) from back to front.

2. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 1 is characterized in that: A circular steel baffle (5) is provided at the bottom of the annular groove of the aluminum rear centering portion (4), and the front and rear surfaces of the steel baffle (5) are respectively in contact with the tail end surface of the projectile (2) and the bottom of the annular groove of the aluminum rear centering portion (4); A circular steel cover plate (7) is provided on the end surface of the aluminum rear centering portion (4) away from the elastic body (2), and the steel cover plate (7) is in contact with the end surface of the aluminum rear centering portion (4).

3. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 2 is characterized in that: An air-sealing ring (6) is provided on the outer cylindrical surface of the aluminum rear centering portion (4), the air-sealing ring (6) is in a circular ring shape, and the air-sealing ring (6) is made of nylon material; The outer cylindrical surface of the aluminum rear centering part (4) is in the shape of a stepped shaft that is thick at the front and thin at the back. The air-closing ring (6) is sleeved from the back to the front on the thin section of the stepped shaft of the outer cylindrical surface of the aluminum rear centering part (4). The front end face of the air-closing ring (6) is pressed against the end face of the thick section of the stepped shaft of the outer cylindrical surface of the aluminum rear centering part (4). The outer diameter of the air-closing ring (6) is larger than the outer diameter of the aluminum rear centering part (4) and the outer diameter of the steel cover plate (7).

4. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 2 is characterized in that: An aluminum rear centering portion connecting hole (19) is provided on the end surface of the aluminum rear centering portion (4) away from the elastic body (2), and a steel cover plate connecting hole (20) is provided on the steel cover plate (7), and the steel cover plate connecting hole (20) is a through hole; the hole position of the aluminum rear centering portion connecting hole (19) corresponds one-to-one to the hole position of the steel cover plate connecting hole (20).

5. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 1 is characterized in that: The front centering portion (1) is provided with a front centering portion weight-reducing through hole (9).

6. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 5 is characterized in that: The front centering portion weight-reducing through hole (9) is an arc-shaped hole or an isosceles trapezoidal hole. There are a plurality of the front centering portion weight-reducing through holes (9), and the plurality of the front centering portion weight-reducing through holes (9) are evenly distributed around the circumference on the end surface of the front centering portion (1).

7. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 6 is characterized in that: A front centering portion reinforcing rib (10) is radially provided between two adjacent front centering portion weight-reducing through holes (9).

8. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 1 is characterized in that: A front centering portion outer chamfer (8) is provided at the intersection of the end face of the front centering portion (1) facing the emission direction and the outer cylindrical surface; an aluminum rear centering portion outer chamfer (18) is provided at the intersection of the end face of the aluminum rear centering portion (4) facing the emission direction and the outer cylindrical surface.

9. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 1 is characterized in that: The inner ring of the front centering part (1) is provided with a front centering part positioning boss (12) protruding radially inward, the front centering part positioning boss (12) is located at the front end of the inner ring of the front centering part (1), the front centering part connecting thread (11) is located at the rear end of the inner ring of the front centering part (1), and the height of the front centering part positioning boss (12) protruding radially inward is higher than the tooth top of the front centering part connecting thread (11); The inner ring of the circular ring of the aluminum connecting ring (3) is provided with an aluminum connecting ring positioning boss (15) protruding radially inward, the aluminum connecting ring positioning boss (15) is located at the rear end of the inner ring of the aluminum connecting ring (3), the aluminum connecting ring internal thread (14) is located at the front end of the inner ring of the aluminum connecting ring (3), and the height of the aluminum connecting ring positioning boss (15) protruding radially inward is higher than the tooth top of the aluminum connecting ring internal thread (14).

10. The lightweight composite centering structure design suitable for a sub-caliber launch balance gun according to claim 1 is characterized in that: An aluminum connecting ring mounting hole (16) is provided on the end surface of the aluminum connecting ring (3), and the rotation axis of the aluminum connecting ring mounting hole (16) is parallel to the rotation axis of the aluminum connecting ring (3).

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