EP1949020B1 - Method for producing a segmented sabot - Google Patents

Abstract

The invention relates to a method or producing a segmented sabot (1) for projectiles having a subcalibre penetrator, which can be connected to a penetrator via a threaded (4) positive locking region and which comprises a plurality of sabot segments (8) arranged one next to the other in the circumferential direction. Said sabot segments (8) are separated in first sections (6) extending from the front end (5) of the sabot (1) in the axial direction by first joints (7) that are continuous in the radial direction and are at first integrally interconnected in a second section (9) that adjoins the first section (6), said second section (9) of the sabot (1) being provided with predetermined breaking points. Said breaking points are produced by producing axially extending second joints (11) in the second section (9), which second joints axially directly adjoin the first joints (7) and which extend from the outer surface (12) of the sabot (1) up to the positive locking region of the sabot (1), thereby forming a perforated threaded section. Once the penetrator is introduced into the sabot (1), the second joints (11) are closed with a vulcanized material by vulcanization.

Description

The invention relates to a method for producing a segmented sabot for projectiles with Unterkalibrigem penetrator with the features specified in the preamble of claim 1.

The production of such a sabot, which is connectable via a formed as a thread form-fitting zone with a subcaliber penetrator, for example, from DE 25 37 116 A1 known. This sabot is composed of a plurality of circumferentially juxtaposed and longitudinally extending sabot segments together, wherein the sabot segments are separated in a direction extending from the front of the sabot in the axial direction of the first portions by radially continuous joints and in a to the first Subregion subsequent second portion are integrally connected to each other. The second portion of the known sabot has no joints between the sabot segments and is very narrow with respect to the first portion. In this case, the width of the second portion is chosen such that this portion, while resisting the firing forces occurring during firing in the gun barrel, ruptures outside of the barrel by centrifugal and / or airflow forces, so that the sabot segments release the subcaliber penetrator.

The abovementioned sabots have the advantage that they can be produced in a simple manner, because the otherwise usually complete segmentation of a blank and the subsequent complicated processing of the sabot segments held together by clamps are dispensed with prior to the introduction of the penetrator into the sabot. However, it has proven to be disadvantageous that in the known projectiles the exact ' Design of the second portions is relatively critical because at too wide second portions of the tear lines when tearing the respective sabot are often not reproducible and disturbing influence of the penetrator is caused by the detaching sabot segments. In the case of very narrow second subregions, on the other hand, there is the danger that the respective penetrator will already be torn open in the weapon barrel at the rear. As a result, propellant gases can pass between the joints and in the form-fitting region between the sabot and the penetrator, which also leads to a non-reproducible flight behavior of the penetrator outside of the gun barrel.

Starting from the DE 25 37 116 A1 The object of the invention is to provide a method for producing a sabot, in which the problems associated with the second portion of the sabot are largely avoided. In particular, therefore, the width of the second portion should be arbitrary within certain limits, without this having a negative impact on the detachment behavior of the sabot of the penetrator.

This object is achieved by the features of claim 1. Further, particularly advantageous embodiments of the invention disclose the dependent claims.

Essentially, the invention is based on the idea of providing the second partial region of the sabot initially left in one piece with predetermined breaking points. These are produced by the fact that in the second portion extending in the axial direction joints are introduced, which connect directly to the axial joints of the first portion and extending from the outer surface of the sabot into the positive connection region of the sabot, so that a perforated threaded area results. After screwing the penetrator into the sabot, the parting lines of the second subregion are then closed by vulcanization with a vulcanizate.

On the one hand, the method can be selected by selecting appropriate process parameters such that the perforations are retained even after vulcanization and Therefore, act as predetermined breaking points in the detachment process of the penetrator segments.

On the other hand, it can also be provided that the perforated threaded portion and the material of the sabot be selected such that it forms in the vulcanization by the thermal expansions to cracks of the still existing sabot material between the threads, so that the joints between the sabot segments in the second portion also extend in the radial direction through the entire sabot wall. The release behavior of the sabot segments is determined in this case primarily only by the properties of the vulcanizate in the event of firing.

It has proven to be advantageous if when using two-flange sabots introduced in the first sections joints only to the front end of the rear flange of the sabot (pressure flange) extend, even if the rear side behind the pressure flange extending sabot range, as is common in large-caliber high-performance tank projectiles, is very long.

The introduction of the joints in the first and / or second portion of the sabot, for example, by means of appropriate band saws etc.

• Fig. 1 die Seitenansicht eines erfindungsgemäßen Treibkäfigs;
• Fig.2 den Längsschnitt des in Fig. dargestellten Treibkäfigs entlang der dort mit II-II bezeichneten Schnittlinie und
• Fig.3 einen in Fig.2 mit III bezeichneten vergrößerten Ausschnitt.

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

• Fig. 1 the side view of a sabot invention;
• Fig.2 the longitudinal section of the sabot shown in FIG. Along the section line II and II
• Figure 3 one in Fig.2 with III designated enlarged detail.

In the Fig.1 and 2 is shown with 1 a two-flange sabot, which is formed as a one-piece body. The front guide flange 2 and the rear pressure flange of the For example, consisting of aluminum sabot 1 are provided with the reference numerals 2 and 3. The sabot 1 has an internal thread 4, by means of which it is positively connected to a penetrator (not shown) connectable.

In one of the front end 5 of the sabot 1 in the axial direction rearwardly extending first portion 6 four uniformly distributed over the circumference and arranged in the radial direction first dividing joints 7 of equal length are provided, each extending to the pressure flange 3 and four circumferentially arranged side by side sabot segments 8 define (in the Fig.2 and 3 only two sabot segments are shown).

In a subsequent to the first portion 6 second portion 9, which extends to the rear end 10 of the sabot 1, the sabot segments 8 are integrally connected. Although the sabot segments 8 are likewise separated by second parting lines 11 extending in the axial direction, these parting lines 11 adjoin axially directly to the parting lines 7 of the first part region 6, however, the parting lines 11 of the second part region 9 extend from the outer surface 12 the sabot 1 in the radial direction is not completely therethrough, but only into the form-locking region 13 into ( Figure 3 ). This results in parting lines 11, which extend to below the thread outer diameter 14, so that there is a perforated threaded portion, wherein the individual perforations in Fig.2 denoted by 15.

After screwing a penetrator into the thread 4 of the sabot 1 and the application of a guide strip in the corresponding groove-shaped recess 16 of the pressure flange 3, the vulcanization of the rear side sabot area 17 is carried out so that the second joints 11 are closed by the vulcanizate and shot no propellant gases can get into the interior of the sabot or in the form-fitting region between sabot and penetrator.

Preferably, the vulcanization is carried out such that by the process heat and the different expansion coefficients of the Penetratormaterials (eg tungsten) and the sabot material (aluminum) push the threads of the sabot 1 on the threads of the penetrator. The resulting tensile stresses in the sabot 1, which act on the remaining material in the perforated predetermined breaking point area, are so great that the connections between the perforations tear 15 and the sabot 1 is held together only by the vulcanizate, not shown.

Of course, the invention is not limited by the embodiment described above. For example, the method according to the invention can also be used for the production of one-flange sabots. Furthermore, it may prove appropriate in individual cases, to select the joints in the second portion of the sabot and the process parameters during vulcanization such that no tearing of the perforations occurs during vulcanization.

In addition, the number of parallel joints can be chosen such that there are two, three or even more than 4 sabot segments.

LIST OF REFERENCE NUMBERS

1

Sabot, two-flange sabot

2

Flange, guide flange

3

Flange, pressure flange

4

Thread, internal thread

5

front end

6

first subarea

7

first parting line

8th

Sabot segment

9

second subarea

10

rear end

11

second parting line

12

outer surface

13

Form-fit area

14

Outer thread diameter

15

perforation

16

recess

17

rear-side sabot area

Claims (3)

1. Method for production of a segmented discarding sabot (1) for projectiles with a sub-calibre penetrator, which can be connected to a penetrator via an interlocking area which has a thread (4), and comprises a plurality of discarding sabot segments (8) which are arranged alongside one another in the circumferential direction, wherein the discarding sabot segments (8) are separated in a first subarea (6), which extends from the front end (5) of the discarding sabot (1) in the axial direction, by first separating joints (7) which are continuous in the radial direction, and are initially integrally connected to one another in a second subarea (9) which is adjacent to the first subarea (6), characterized in that second separating joints (11) which extend in the axial direction are incorporated in the second subarea (9), are axially directly adjacent to the first separating joints (7) and extend from the outer surface (12) of the discarding sabot (1) into the interlocking area (13) of the discarding sabot (1), thus resulting in a perforated threaded area, and in that, after the penetrator has been introduced into the discarding sabot (1), the second separating joints (11) are closed by vulcanization with a vulcanizate.
2. Method according to Claim 1, characterized in that the perforated threaded area and the material of the discarding sabot (1) are chosen such that, when the vulcanization process is carried out, the thermal expansions of the discarding sabot material lead to cracks being formed in the discarding sabot material which is still present between the thread pitches.
3. Method according to Claim 1 or 2, characterized in that, in the case of a two-flange discarding sabot (1), the first separating joints (7) which are incorporated in the first subarea (6) extend to the front end of the rear flange (3) of the discarding sabot (1).

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