EP2834589B1 - Fin-stabilized full-caliber training projectile, and method for producing same - Google Patents

Description

The invention relates to a ladder-stabilized full-caliber training projectile which can be fired from a weapon barrel and has a solid head part and a tubular tail body adjoining the head part on the rear side, the training projectile being provided peripherally with a sealing system. The invention further relates to a method for producing such a training projectile.

Such a full-caliber practice bullet is from the document DE 10 2010 034 333 A1 known. It is a large caliber, for example, from a tank cannon with the caliber 120 mm shootable training projectile. In contrast to comparable known full-caliber practice projectiles, which usually comprise a head part with an adjoining projectile casing and a shaft with fin assembly adjoining the projectile casing, the projectile casing itself is designed as a tubular fin body in the aforementioned training projectile, so that a separate shank may be omitted with attached fin assembly. The resulting at the launch of the practice projectile projectile charge gases reach in this full-caliber training projectile in the interior of the tubular tail body and act to accelerate the practice projectile on the rear-side portion of the headboard, which limits the interior geschosskopfseitig.

To ensure that when shooting down in the DE 10 2010 034 333 A1 disclosed training projectile no propellant gases between the inner wall of the gun barrel and the outer wall of the training projectile can flow past this, is about the outside of a known sealing system arranged in the rear third of the tubular portion of the tail body. This consists essentially of a recessed into the outer surface of the tail body annular groove into which engages an existing plastic sealing ring.

When launching large-caliber practice bullets, a high internal pressure of the propellant charge gases occurs within the tubular tail body, which strongly acts on the side wall of the tubular tail body, in particular in the region between the sealing system and the head part. This can have an effect on the firing resistance, in particular when using a lighter body of a light metal.

The DE 35 32 411 C2 deals with trained as a training ammunition shaped charge projectile with caliber-identical stabilizer, which has a front and a rear explosive chamber and which is provided at the end face of the projectile casing with a firing bar. The connection plate is in this case formed with the firing rod and the rear explosive chamber forming part of the projectile casing as a forging and welded to a cylindrical tube made of the same metal as the central part. Between the front and the rear explosive chamber, a support disk is arranged, which prevents the projectile shell from being compressed by the high firing pressure, so that the projectile shell requires only a small wall thickness.

The DE 7346003 U1 refers to a projectile with stabilized rotation. According to this solution, a control ring is attached to a rear part of the projectile. The engages during firing in the gun barrel twist and gives the projectile a rotation. The body tapers from a maximum diameter immediately before the control ring to the front end of the projectile body. The conical part is provided with circumferentially spaced-apart projections which fit tightly and extend radially.

From the WO 96/12927 A In particular, a method for providing a KE ammunition, such as a subcaliber bullet, with the slipping leader tape is disclosed.

The US 4,040,359 A shows a fragile circulating belt consisting of a plastic-glass mixture. This breaks through pressure during the weapon pass.

The invention has for its object to provide a full-caliber practice projectile of the type mentioned, the firing resistance ensured in a cost effective manner is. Furthermore, a method for producing such a training projectile will be disclosed.

This object is achieved with respect to the exercise projectile by the features of claim 1 and in terms of the method by the features of claim 5. Further, particularly advantageous embodiments of the invention disclose the dependent claims.

The invention is based essentially on the idea to dispense with a sealing system in the tubular portion of the tail body and form the tail body partially unterkalibrig, so that the firing charge gases produced at the launch of the training projectile also act on the outside of the side wall of the tubular tail body and thus the on the Outside of the tubular tail body acting pressure counteracts the acting on the inside of the side wall of the exercise projectile internal pressure. In this case, a guide is provided in particular for reducing an initial donation of the exercise projectile in the rear region of the tail body, which comprises a plurality of evenly distributed over the circumference of the tail body arranged, web-shaped guide elements. In addition, a sealing system in the region of the massive head portion of the exercise bullet is arranged to avoid an outside bypassing the propellant charge gases on the practice floor within the barrel.

In order to obtain a compact construction of the training projectile, it has proved to be advantageous if the guide elements are not separate parts but parts of, for example, a light metal (such as an aluminum alloy) existing tail body.

The guide should comprise at least three web-shaped guide elements.

The web-shaped guide elements can advantageously be provided on their outer end in each case with a thin layer or a plate made of plastic or of a viscous paint. As a result, on the one hand it is ensured that the guide elements of the tail body support it exactly at the tube inner wall when introducing the practice projectile into the corresponding weapon barrel. On the other hand, a Such layer or plate made of plastic, in particular when using a cartridge with combustible sleeve, a radial support and thus a relief of the cardboard parts (sleeve casing and sleeve cover) of the cartridge case in the packaging of the corresponding cartridge or in the corresponding ammunition bunker. In addition, the attached plastic element serves to fulfill the interface requirement. This requires a minimum diameter at the position in the cartridge (for example, 120.6 mm for a 120 mm cartridge).

As soon as the training projectile provided with such a plastic layer penetrates into the corresponding weapon barrel upon firing, this layer or plate is stripped off or strongly compressed, so that it does not hinder the aerodynamics of the practice bullet after leaving the weapon barrel.

It has proven to be advantageous if, for the production of a practice projectile according to the invention, first a somewhat sub-caliber tail body is produced with a closed, essentially same-sized guide ring, and then grooves are milled into the guide ring for the axial gas passage.

Fig. 1

die Seitenansicht eines erfindungsgemäßen, aus einem Kopfteil und einem rohrförmigen Leitwerkskörper bestehenden Vollkaliber-Übungsgeschosses,

Fig. 2

die Ansicht des Querschnittes des Leitwerkskörpers des in Fig. 1 dargestellten Übungsgeschosses entlang der dort mit II-II bezeichneten Schnittlinie und

Fig. 3

einen vergrößerten Ausschnitt des in Fig. 2 mit III bezeichneten Wandbereiches d es Leitwerkskörpers.

Further details and advantages of the invention will become apparent from the following, explained with reference to figures embodiment. Show it:

Fig. 1

the side view of an inventive, consisting of a head part and a tubular tail body full caliber training projectile,

Fig. 2

the view of the cross section of the tail body of in Fig. 1 shown training projectile along there with II-II designated section line and

Fig. 3

an enlarged section of the in Fig. 2 III designated wall area d of the tail body.

In Fig. 1 is denoted by 1 from a gun barrel, not shown firing stabilizer stabilized full-caliber practice bullet (see also DE 10 2010 034 333 A1 ), which is a solid headboard 2 and a rear side of the headboard 2 subsequent tubular Leitwerkskörper 3 includes.

The tubular tail body 3 is designed such that the propellant charge gases formed during the launch of the training projectile 1 both into the interior 4 of the tail body 3 (FIG. Fig. 2 ) as well as on the outside 5 of the side wall 6 of the tubular fin body 3 act.

For this purpose, the tail body 3 is formed substantially unterkalibrig and is supported by six evenly spaced, web-shaped guide elements 7 on the inner wall of the gun barrel, not shown.

The web-shaped guide elements 7 are peripherally provided in each case with a layer 9 or a plate made of plastic or from a viscous paint ( Fig. 3 ), whose layer thickness is, for example, in the order of 0.5 mm for a 120 mm practice round. This layer 9 is used inter alia to relieve the cardboard parts (Hüisenmantel, sleeve cover) provided with a combustible sleeve cartridge which receives the practice of the invention bullet.

Once the exercise bullet 1 then penetrates into the gun barrel, not shown, this layer 9 is stripped off or strongly compressed, so that it does not hinder the aerodynamics of the training projectile 1 when leaving the gun barrel.

For the preparation of the web-shaped guide elements 7, it has proven to be advantageous if first a tail body 3 is made with a closed, substantially same-caliber guide ring, and then groove-shaped recesses 8 are milled into the guide ring for the axial passage of gas.

In order to avoid that the propellant charge gases within the gun barrel can flow past the entire exercise floor 1 on the outside, a sealing system 10 is arranged in the area of the solid head part 2 of the practice floor 1.

It attacks in the in Fig. 1 illustrated embodiment, an existing plastic sealing ring 11 in a circumferential groove-shaped recess (annular groove) 12 in the rear-side region of the head part 2 a. This sealing system 10 is around a conical seal, wherein the width of the annular groove 12 is greater than the width of the sealing ring 11, so that the sealing ring 11 is axially displaceable to the projectile tip at a pressurization by the propellant gases within the annular groove 12. Due to the conical configuration of the groove bottom of the annular groove 12, the axial displacement of the sealing ring 11 also causes a radial widening of the sealing ring 11, so that there is a permanent Liderung between the training projectile 1 and the inner wall of the gun barrel.

LIST OF REFERENCE NUMBERS

1

Full-caliber practice floor, training floor

2

headboard

3

tail body

4

inner space

5

outside

6

Side wall

7

guide element

8th

recess

9

layer

10

sealing system

11

sealing ring

12

groove-shaped recess, annular groove

Claims (5)

1. Fin-stabilized full-calibre training projectile (1) that can be fired from the barrel of a weapon, comprising a solid head part (2) and a tubular fin body (3) adjoining the rear side of the head part (2), the training projectile (1) being provided circumferentially with a sealing system (10), characterized by the following features:

   a) the tubular fin body (3) is partially formed in a sub-calibre manner in such a way that the propellant gases produced upon firing the training projectile (1) also act on the outer side (5) of the side wall (6) of the tubular fin body (3),

   b) the tubular fin body (3) has circumferentially a number of guiding elements (7) that are uniformly spaced apart from one another and take the form of webs, and

   c) the sealing system (10) is arranged in the region of the head part (2) of the training projectile (1).
2. Full-calibre training projectile according to Claim 1, characterized in that the fin body (3) has at least three guiding elements (7) in the form of webs.
3. Full-calibre training projectile according to either of Claims 1 and 2, characterized in that the fin body (3) and the guiding elements (7) integrally connected to it consist of a light metal.
4. Full-calibre training projectile according to one of Claims 1 to 3, characterized in that the guiding elements (7) in the form of webs are respectively provided at their outer end with a layer (9) or a sheet of plastic or of a high-viscosity coating.
5. Method for producing a full-calibre training projectile according to one of Claims 1 to 4, characterized in that first a fin body with a closed guiding ring of substantially the same calibre is produced, and in that then a number of clearances (8) for allowing the gas to pass through axially are milled into the guiding ring, arranged in a uniformly distributed manner around the circumference of the guiding ring.

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