DK2909570T3

DK2909570T3 - Cartridge and method of manufacture thereof

Info

Publication number: DK2909570T3
Application number: DK13779532.4T
Authority: DK
Inventors: Thomas Heitmann; Frank Schötzig; Michael Vagedes
Original assignee: Rheinmetall Waffe Munition Gmbh
Priority date: 2012-10-19
Filing date: 2013-10-07
Publication date: 2018-08-20
Also published as: PT2909570T; EP2909570A1; HUE039282T2; PL2909570T3; DE102012020540A1; TR201810338T4; ES2681977T3; EP2909570B1; WO2014060237A1

Abstract

The invention relates to a training cartridge or combat ammunition comprising a combustible propellant charge casing consisting of a casing exterior and a casing cover (5), and a fin-stabilized full-caliber projectile (1) having a solid head part (2) and a tubular fin body (3) adjoining the rear end of the head part (2), the conically tapering front region (4) of the casing cover (5) projecting at least partially into a correspondingly conically tapering rear end region (6) of the tubular fin body (3) and being non-positively connected to the latter with the aid of an adhesive (7). The adhesive (7) further serves as a damper. In order to avoid damages to the propellant charge casing caused by the full caliber projectile under the effect of environmental loads, the adhesive (7) is designed as a damper between the full caliber projectile (1) and the casing cover (5) of the propellant charge casing.

Description

DESCRIPTION

CARTRIDGE AND CORRESPONDING METHOD OF PRODUCTION

The invention relates to a practice cartridge or live ammunition with a combustible propellant charge case comprising a case sleeve and a case cover and also a tail-stabilised full-calibre projectile with a solid head section and tubular tail body adjoining the rear of the head section. The front conically tapering section of the case cover of the propellant charge case protrudes at least partially into a corresponding conically tapering rear end section of the tubular tail body and is force-fitted thereto by means of an adhesive. In order to avoid damage to the propellant charge casing through the full-calibre projectile in the event of environmental stresses, the invention proposes configuring the adhesive between the full-calibre projectile and the case cover of the propellant charge case as a damping element.

The use of adhesive even in practice ammunition is known per se. Thus, DE 10 2009 009 772 A1 discloses a force-fitted adhesive connection between a segmented receiving device and a propellant element. An adhesive connection between knobshaped extensions with a support wall is cited in DE 10 2008 029 397 Al. DE 10 2008 015 421 A1 envisages adhering a section of a case cover acting a sealing ring to the projectile. On the other hand, DE 10 2007 037 741 A1 moves away from such adhesive connections and proposes connecting the case sleeve and projectile to each other by means of friction welding. A practice cartridge in which a case cover and a projectile casing are connected to each other via an adhesive connection is known from DE 10 2010 034 333 Al. This involves ammunition with a projectile calibre of, for example, 120 mm that can be fired from the cannon of a tank.

In contrast to comparable known practice cartridges with full calibre projectiles which usually comprise a head section with a projectile casing adjoining it and a shaft with fin assemblies adjoining the projectile casing, in the practice projectile according to DE 10 2010 034 333 A1 the projectile casing itself designed as a tubular tail body do that a separate shaft with a fin assembly attached thereto can be dispensed with. In this full-calibre practice projectile the propellant charge gases produced on firing the practice projectile enter the interior of the tubular tail body and to accelerate the practice projectile act on the tail-side area of the head section which delimits the interior on the projectile head side. In these cartridges the mass forces of the relatively heavy projectiles occurring in the event of environmental stresses (vibrations, falling of the projectile) are essentially take up by the combustible propellant charge cases. For internal ballistic reasons, at a given diameter it is not possible to significantly increase the wall thickness in order to increase the strength of the propellant charge cases.

The purpose of the invention is to show a possibility in which the probability that damage occurring to the propellant charge casing through the full-calibre projectile due to environmental stresses is essentially reduced compared with comparable known cartridges. A method of producing a cartridge of this type is also set out.

On the basis of DE 102010034333 Al, in accordance with the invention, with regard to the practice or live cartridge this task is solved by the features of claim 1 and with regard to the method by the feature of claim 6. Other, particularly advantageous embodiments of the invention are disclosed in the sub-claims.

The invention is essentially based on the idea of arranging a damping element between the full-calibre projectile and the case cover of the propellant charge case. This is done in a simple manner through the appropriate selection and arrangement of an adhesive made of an elastic material which on the one hand connects the case over to the full-calibre projectile and on the other hand acts as damping or damping means. This means that the adhesive also/at the same time acts as damping means.

It has proven to be advantageous if as an adhesive, a silicone adhesive, preferably a silicone rubber, with a layer thickness of at least 300 pm (+/-) is used. However, the layer thickness(es) depend(s) on the adhered surface so that the preferred layer thickness(es) should only be considered as (a) guideline and experience value(s).

To produce such a connection the case cover is arranged by means of a tool centred, but at a radial distance with regard to the tail body and the silicone adhesive is then thickly applied to the outer side of the case cover. The tail body is then pushed onto the case cover in such a way that the intermediate space between the case cover and the tail body is completely filled by the silicone layer. The silicone layer is then hardened.

Further details and advantages of the invention are set out in the following example of embodiment explained by way of a figure.

Shown in the figure is a longitudinal section of a full-calibre projectile known from DE 10 2010 034 333 A1 the tail body of which is connected to the case cover of a propellant charge case (not shown completely).

The tail-stabilised full-calibre projectile is designated 1 and comprises a solid head section 2 as well as a tubular tail body 3 adjoining the head section 2 on the rear side. The forward, conically tapering section 4 of the case cover 5 protrudes into a corresponding conically tapering rear section 6 of the tubular tail body 3 and is connected to this by means of an adhesive 7.

In accordance with the invention it is now envisaged that the adhesive 7 brings about both a form-fitting connection between the case cover 5 and the tail body 3 and also assumes the function of a damping element in order to prevent damage to the propellant charge case by the full-calibre projectile 1 in the event of environmental stresses.

For this the case cover 5 is arranged by means of a tool centred with regard to the tail body 3 but at radial distance therefrom. A silicone adhesive 7, preferably silicone rubber (for example Elastosil E43 by the company Wacker Chemie,

Munich) is then thickly applied to the outer side 8 of the case cover 5. The tail body 3 is then pushed so far onto the case cover 5 until the distance between the outer side 8 of the case cover 5 and the inner side 9 of the tail body 3 is around 500 pm. The intermediate space between the case cover 5 and the tail body 3 is then completely filled with the silicone adhesive 7.

Finally the silicone layer 7 between the case cover 5 and tail body 3 is then hardened. E-type silicone adhesives by Elastosil are single-component adhesives which harden through the absorption of moisture from the air. The determined hardening time for further handling is at least 6 hours. If, on the other hand, dual-component adhesives, e.g. Loctite, are used the determined hardening time is at least 50 minutes. Through this the duration of hardening can be considerably reduced.

List of reference 1. Full-calibre projectile 2. Head section 3. Tail body 4. Section 5. Case cover 6. Section 7. Adhesive, silicone adhesive 8. Outer side (case cover) 9. Inner side (tail body)

Claims

A cartridge comprising a combustible cartridge casing and a sheath cap (5) and a tail-stabilized full-caliber projectile (1) with a solid body (2) and a tubular tail body (3) joining the body (2) to the body (2), wherein the front tapered area (4) of the sheath cover (5) projects at least partially into a corresponding tapered area (6) on the tail side and is connected forcefully thereto by an adhesive (7), characterized in that: the adhesive (7) is an elastic material which further serves as a damping element.

Cartridge according to claim 1, characterized in that the layer thickness of the adhesive (7) is between 200-500 µm.

Cartridge according to claim 2, characterized in that the layer thickness of the adhesive (7) is preferably 300 µm.

Cartridge according to one of claims 1 to 3, characterized in that the adhesive (7) is a silicone adhesive.

Cartridge according to claim 4, characterized in that the silicone adhesive (7) is a silicone rubber.

Cartridge according to one of claims 1 to 5, characterized in that the cartridge is an exercise cartridge or combat ammunition.

Process for producing a cartridge according to one of claims 1 to 6, characterized in that the sheath cover (5) is arranged by means of a tool centered, but at radial distance from the tail body (3), that the adhesive (7) is applied as a a thick bead on the outside (8) of the sheath cover (5), and the tail body (3) is subsequently pushed onto the sheath cover (5) in such a way that between the space between the sheath cover (5) and the tail body (3) is completely filled by the adhesive ( 7) and the adhesive (7) is then cured.