RU2364823C1 - Method of producing separable casing of signal ammunition - Google Patents

Abstract

FIELD: ammunition.

SUBSTANCE: invention relates to ammunition to be fired from ship-based grenade-launcher systems. Proposed method comprises mechanical processing of hollow cylinder and bottom, fitting seal ring on the bottom outer surface at the point the bottom joint the cylinder via, for example magnetic-pulse squeezing. Note that prior to seal ring fitting, the cylinder and bottom surfaces in contact are mechanically hardened to form cold-work with the strain degree of 5 to 10 %. Antifreeze lubricant is applied onto bottom surface in contact with the cylinder. The cylinder and bottom are fitted on expanding mandrel to center their inner surfaces.

EFFECT: higher reliability, tightness and reduced play of mating parts.

1 ex, 5 dwg

Description

The invention relates to the field of armament, and in particular to signal munitions with a housing that is separated at the time of splashdown and intended for firing (launching), preferably from marine grenade launcher systems.

Signal ammunition for marine grenade launcher systems operate according to a complex ballistic scheme:

- a shot of ammunition from a grenade launcher;

- flight of ammunition along an air trajectory for a given range;

- splashdown of ammunition with simultaneous operation of the means of initiation;

- separation of ammunition at a depth with the simultaneous ignition of the pyrotechnic composition of the torch and the ejection of a signal device from the shell of the ammunition;

- ascent of the signal device to the water surface and the supply of a light signal.

The detachable body of the signal munition must meet the following requirements:

- ensure the tightness of the signal element;

- to have the smallest possible runout to ensure high external ballistic characteristics of the munition;

- to ensure the trouble-free operation of the ignition-blow-out charge and the signal element, the dispersion of the separation forces should be in a narrow range and should not depend on the temperature range of the combat use of the signal munition.

A large number of methods are known for manufacturing separable bodies.

So, in US patent No. 2342096 the body of the lighting projectile is made of two parts with their subsequent connection using thread that is destroyed at the time of separation.

Such a technical solution without the use of sealing elements leads to a significant range of efforts to separate the housing and does not ensure the tightness of the connection.

A known method of manufacturing a body of lighting ammunition (German patent No. 1703734 dated 07/04/1968), based on the machining of the cylinder and the bottom with their subsequent connection with bolts that are cut off when the case is separated.

This technical solution has the disadvantages of a technical solution according to US patent No. 2342096.

Known (US Pat. Germany No. 1913790 from 01/08/1970) a method of manufacturing a shell of smoke munition, based on the implementation in the body of a weakening bridge, which is destroyed during separation.

This technical solution allows to ensure the tightness of the equipment of the housing and the minimum runout of the bottom relative to the shell, but at the same time, the dispersion of the forces of separation of the housing is in a wide range, which significantly reduces the reliability of the ignition-blow charge and the signal element.

Known (Swedish patent No. 213493 dated 01/01/1963 - prototype) a method of manufacturing a shared housing for lighting ammunition, including machining the hollow cylinder and the bottom, installing the sealing ring on the bottom at the junction with the cylinder, followed by connecting the cylinder and the bottom with pins, cut off when dividing the case.

The disadvantages of this technical solution include:

- a wide range of variation in the forces of separation of the body, caused by the dispersion of the mechanical characteristics of the metal of the cylinder, bottom and pins;

- a high misalignment of the bottom cylinder, worsening the external ballistic characteristics of the munition.

The task of the invention is to increase the reliability of the signal munition.

The technical result consists in reducing the dispersion of forces during the separation of the housing, increasing the tightness of the shared housing and reducing the misalignment of the shared parts of the housing.

The technical result is achieved by the fact that the method of manufacturing a shared body of the signal munition includes machining the hollow cylinder and the bottom, installing on the outer surface of the bottom at the junction with the cylinder a sealing ring and connecting the cylinder and the bottom, for example, by magnetic pulse compression, while prior to installation of the sealing ring, riveting is created on the contacting surfaces of the cylinder and the bottom with a degree of deformation of 5-10 percent, and the bottom surface is in contact with the cylinder and antifreeze grease and install the cylinder and the bottom on the expanding mandrel, centering them on the inner surfaces.

When creating surface hardening on the contacting surfaces of the cylinder and the bottom with a degree of deformation in the range of 5–10 percent, both the surfaces are hardened and the microprofiles are smoothed out, which allows for a practically “clean” shift of the cylinder relative to the bottom, to prevent filling of the bottom irregularities with the cylinder material, significantly reduce the spread of effort in the separation of the body.

The lower limit of deformation is selected from the condition that the surface cleanliness is not coarser than Rz10, which ensures a minimum force dispersion during the separation of the case, and, consequently, the stability of the ballistic characteristics of the ignition-blow charge, which eliminates the possibility of destruction of the signal device case and the absence of ignition at the time of separation of the munition case pyrotechnic composition of the torch signaling device.

The upper boundary of the deformation is due to the strength characteristics of the surface layer of the contacting parts, i.e. with an increase in the degree of deformation of more than 10 percent, during compression, microcracks form in the surface layer, contributing to a violation of the tightness of the case at the place of connection of the parts, which, ultimately, reduces the reliability of the signal munition.

Application of an antifreeze lubricant on the bottom surface of the antifreeze grease in contact with the cylinder made it possible to reduce the friction forces during separation of the housing and increase the tightness of the joint, since after crimping the grease is in a closed volume under pressure, filling in the microroughness of the mating surfaces. In addition, antifreeze grease is a compensator for the influence of temperatures in the range of combat use of signal ammunition on the dispersion of forces during separation of the hull, i.e. virtually eliminates the influence of changes in the mechanical properties of the mating parts when the ambient temperature changes on the dispersion of forces during the separation of the case, which helps to increase the reliability of the signal munition.

Installing the mandrel before expanding the cylinder and the bottom on a mandrel centering them along the inner surfaces made it possible to virtually eliminate misalignment of the parts after crimping, which helped to reduce the dispersion of the body separation forces and significantly improved the external ballistic characteristics of the signal munition.

Figure 1 shows a General view of a shared housing signal ammunition manufactured by the present method.

Figure 2-5 shows the operation for the manufacture of the housing.

Example

According to the claimed method carry out the manufacture of a shared housing of the signal munition (see figure 1-5). In this case, the hollow cylinder 1 and the bottom 3 are machined, then the adjacent surfaces of the cylinder and the bottom are finished by rolling by a profile roller with a deformation degree of 5-10 percent with the formation of rivets 2 (see figure 2) and 4 (see figure 3 ), apply antifreeze lubricant 6 to the bottom surface of the cylinder in contact with the cylinder, and install an o-ring 5 (see Fig. 4), install the cylinder and bottom onto an expandable mandrel 7 (see Fig. 5), centering them on the inner surfaces, and produce crimp cylinder 1 to bottom 3, for example p magnetic pulse method.

The test results confirmed that the use in the signal ammunition of the hull made by the proposed method can improve the reliability of its action by reducing the dispersion of forces during separation of the hull, increasing the tightness of the junction of the parts of the hull, reducing the runout of mating parts.

Claims (1)

A method of manufacturing a shared body of signal ammunition, including machining the hollow cylinder and the bottom, installing on the outer surface of the bottom at the junction with the cylinder of the sealing ring and then connecting them, for example, by magnetic pulse method, characterized in that before installing the sealing ring on the contacting surfaces the hollow cylinder and the bottom create a hardening with a degree of deformation of 5-10%, apply antifreeze lubricant to the bottom surface in contact with the hollow cylinder and install t a hollow cylinder and a bottom on an expanding mandrel, centering them on the inner surfaces.

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