WO2013150095A1

WO2013150095A1 - Fin-stabilized full-caliber training projectile, and method for producing same

Info

Publication number: WO2013150095A1
Application number: PCT/EP2013/057095
Authority: WO
Inventors: Klaus-Dieter Freudenthal; Thomas Heitmann; Michael Vagedes
Original assignee: Rheinmetall Waffe Munition Gmbh, Patente
Priority date: 2012-04-05
Filing date: 2013-04-04
Publication date: 2013-10-10
Also published as: DE102012006892B3; EP2834588A1

Abstract

The aim of the invention is to ensure the firing stability of a full-caliber training projectile (1) in an inexpensive manner, said training projectile comprising a solid head part (2) and a tubular fin body (3) which adjoins the rear side of the head part (2). According to the invention, this is achieved by designing the fin body (3) such that the propellant gases produced upon firing the training projectile (1) also act on the exterior (5) of the lateral wall (6) of the tubular fin body (3). For this purpose, a guiding system (7) is provided in the rear region of the fin body (3), said guiding system comprising a guiding strip (9) which is received by an annular groove (8) of the fin body (3). The guiding strip (9) has multiple web-shaped guiding elements (10) which are uniformly distributed over the circumference of the fin body (3) and which support the fin body (3) against the inner wall of the corresponding barrel. Furthermore, a sealing system (12) is arranged in the region of the solid head part (2) of the training projectile (1) in order to prevent the propellant gases from passing by the exterior of the training projectile (1) within the barrel.

Description

DESCRIPTION

Tail stabilized full-caliber training projectile and procedure to his

manufacturing

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 end on the rear side, the training projectile being provided on the intake side with a sealing system. The invention further relates to a method for producing a training projectile according to the invention.

Such a full-caliber training projectile is known from the document DE 10 2010 034 333 A1. 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.

In order to ensure that no propellant charge gases can flow past the inner wall of the weapon barrel and the outer wall of the training projectile at the launch of the training projectile disclosed in DE 10 2010 034 33 A1, an outside is approximately at the rear third of the tubular portion of the tail body arranged known sealing system. 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 projectiles, a high internal pressure of the Treibiadungsgase occurs within the tubular tail body, which strongly act on the side wall of the tubular Leitwerkskörpers especially in the area 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.

DE 35 32 411 C2 deals with a trained as a dummy ammunition hollow 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 rod. The con nection plate is in this case formed with the firing rod and the rear explosive chamber forming part of the projectile casing as 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.

DE 7346003 U1 relates 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 in the circumferential direction with spaced-apart projections, which sit firmly and extend radially.

From WO 96/12927 A, a sliding guide band is known, wherein in particular a method for providing a KE ammunition, such as subcaliber bullet, with the sliding guide band is shown. The US 4,040,359 A shows a fragile circulating belt consisting of a plastic-Gias mixture. This breaks down due to pressure during the waf- fenslauf.

The invention has for its object to provide a full-caliber practice bullet of the type mentioned, the firing resistance is ensured in a cost effective manner. 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 system is provided in particular for reducing an initial donation of the training projectile in the rear region of the tail body, which comprises a guide strip receiving a ring groove of the tail body. The guide band has a plurality of evenly distributed over the circumference of the tail body arranged, web-shaped guide elements, which support the tail body, and thus also the practice projectile, on the inner wall of the corresponding weapon barrel. 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.

While the tail body preferably consists of a light metal (usually an Aiuminiumiegierung), is preferably used as the material for the guide band plastic, sintered metal or soft iron. The guide band should comprise at least three web-shaped guide elements. The lateral spacing of adjacent web-shaped guide elements can be greater than the width of the respective guide element. The flow area can also be increased in depth.

To produce the practice projectile, the annular groove and then into the annular groove the guide strip having the web-shaped guide elements is first introduced into the outside of the tubular guide body.

When using plastic as a guide tape material either a corresponding, provided with guide elements guide tape can be prefabricated and then this pressed into the annular groove of the tail body (shrunk) or the guide tape material is using a corresponding, the contour of the guide elements and the recesses having shape in the Injected annular groove of the tail body.

When using sintered metal or soft iron as a guide tape material either a corresponding, provided with guide elements guide tape prefabricated and then pressed into the annular groove of the tail body (or shrunk after heating by appropriate cooling) or the guide tape material is using a corresponding, the contour the guide elements and recesses having mold poured into the annular groove of the tail body. Alternatively, it is possible to produce the ring of sintered metal or soft iron, press and mechanically herzusteilen the final contour.

Further details and advantages of the invention will become apparent from the following, explained with reference to figures embodiment. Show it: Fig. 1 shows the longitudinal section through an inventive, from a opftei! and a tubular tail body existing Vollkaiiber exercise floor and

Fig. 2 is an enlarged cross-section of the tail body of the training projectile shown in Fig. 1 along the section line II-II thereof.

1 shows a ladder-stabilized solid quake practice projectile which can be fired from a weapon barrel (not shown) (see also DE 10 2010 034 333 A1), which comprises a solid head part 2 and a tubular tail body 3 adjoining the head part 2 at the rear ,

The example of an aluminum alloy tubular Leitwerkskörper 3 is designed such that the resulting upon launch of the exercise projectile 1 propellant charge gases both in the interior 4 of the tail body 3 and on the outside 5 of the side wall 6 of the tubular fin body 3 act.

For this purpose, the tail body 3 is provided with a guide system 7, which includes a milled into the outer side 5 of the tubular tail body 3, circumferential, groove-shaped recess (annular groove) 8, in which an existing example of a suitable plastic guide strip 9 is arranged. The guide belt 9, seen in the circumferential direction, twelve equally spaced, web-shaped guide elements 10, between which are provided in the axial direction extending recesses 1 1 for the axial passage of the launching of the training projectile 1 Treibiadungsgase.

The guide elements 10 of the guide strip 9, which are formed slightly überkaiibrig be compressed during the launch of the exercise projectile 1 and thus provide a play-free leadership in the barrel. In addition, they serve a radial guidance of the corresponding, the practice bullet 1 containing cartridge in their transport packaging or ammunition bunker. Another object of the over-caliber plastic element is to achieve the interface problem, which is that at this position a minimum diameter is required (for example, 120.6 mm with 120 mm cartridges). In order to avoid that the propellant charge gases within the gun barrel can flow past the entire training floor 1 on the outside, a sealing system 12 is arranged in the region of the solid head part 2 of the practice projectile 1.

In this case, in the exemplary embodiment illustrated in FIG. 1, a sealing ring 13 made of plastic engages in a circumferential groove-shaped recess (annular groove) 14 in the rear-side area of the head part 2. In this sealing system 12 is a conical seal, wherein the width of the annular groove 14 is greater than the width of the sealing ring 13, so that the sealing ring 13 is axially displaceable to the projectile tip at a pressurization by the propellant gases within the annular groove 14. Due to the conical configuration of the groove bottom of the annular groove 14, the axial displacement of the sealing ring 13 also causes a radial widening of the sealing ring 13, so that there is a permanent Liderung between the training projectile 1 and the inner wall of the gun barrel.

For the preparation of the guide system 7, it has proven to be advantageous if first in the outer side 5 of the tubular fin body 3, the annular groove 8 and then in the annular groove 8, the web-shaped Führungsseiemente 10 having guide tape 9 is introduced. In this case, a corresponding, provided with guide elements guide tape prefabricated and this then pressed into the annular groove of the tail body (shrunk).

But it can also be provided that the leader tape material! is injected into the annular groove of the tail body using a corresponding shape having the contour of the guide elements and the recesses.

Of course, the invention is not limited to the embodiment described above. Thus, for example, a suitable sintered metal or soft iron can be used as a guide strip material instead of plastic. The guide strip provided with the guide elements can then in turn be prefabricated and pressed into the annular groove of the tail body (shrunk) or the guide strip material, using a corresponding, the contour of the guide elements and recesses having shape, are poured into the annular groove of the tail body. Furthermore, the guide band can be provided in the circumferential direction with predetermined breaking parts, so that it blown away after leaving the gun barrel of the air forces and the aerodynamics of the training projectile 1 is not adversely affected by the guide band.

LIST OF REFERENCE NUMBERS

1 full caliber practice floor, practice floor

2 headboard

3 tail bodies

4 interior

5 outside

6 side wall

7 guidance system

8 recess, annular groove

9 leader band

10 guide element

11 recess

12 sealing system

13 sealing ring

14 groove-shaped recess, annular groove

Claims

1. From a gun barrel fireable stabilizer stabilized full-caliber practice bullet (1) with a solid head part (2) and a rear side of the head part (2) subsequent tubular tail unit (3), the Ubungsgeschoss (1) circumferentially with a sealing system (12) is provided, with the features: a) the tubular fin body (3) is partially formed such Unterkalibrig that at launch of the practice projectile (1) resulting propellant gases on the outside (5) of the side wall (6) of the tubular Baffle body (3) act, b) the outer side (5) of the tubular tail body (3) contains at least one circumferential groove-shaped recess (annular groove) (8), in which a guide strip (9) is arranged; c) the guide strip (9) has, viewed in the circumferential direction, a plurality of equally spaced, web-shaped guide elements (10) between which recesses (11) for axial passage of the launching of the practice projectile (1) resulting propellant gases are provided, and d) the sealing system (12) is arranged in the region of the head part (2) of the training projectile (1).

2. Vollkaiiber exercise projectile according to claim 1, characterized in that the tail body (3) made of light metal and the guide strip (9) made of plastic, sintered metal or soft iron.

3. Vollkaltber-training projectile according to claim 1 or 2, characterized in that the guide strip (9) has at least three web-shaped guide elements (10).

4. A method for producing a full-caliber training projectile according to one of claims 1 to 3, characterized in that first in the outer side (5) of the tubular tail body (3), the annular groove (8) and then into the annular groove (8) that the web-shaped trained guide elements (10) having guide strip (9) is introduced.

5. The method according to claim 4, characterized in that when using plastic as a guide strip material either first with a guide elements (10) provided guide band (9) prefabricated and this is then pressed into the annular groove (8) of the tail body or that the Führungsbandmateriai using a corresponding, the contour of the guide elements (10) and the recesses (11) having the form in the annular groove (8) of the tail body (3) is injected.

6. The method according to claim 4, characterized in that when using Sintermetali or soft iron as Führungsbandmateriai either first with a guide elements (10) provided guide band (9) prefabricated and this then in the annular groove (8) of the tail body (3) is pressed or the guide band material is poured into the annular groove (8) of the tail body (3) using a corresponding shape having the contour of the guide elements (10) and recesses (11).