CA2715806A1 - Explosive projectile and method for the production thereof - Google Patents
Explosive projectile and method for the production thereof Download PDFInfo
- Publication number
- CA2715806A1 CA2715806A1 CA2715806A CA2715806A CA2715806A1 CA 2715806 A1 CA2715806 A1 CA 2715806A1 CA 2715806 A CA2715806 A CA 2715806A CA 2715806 A CA2715806 A CA 2715806A CA 2715806 A1 CA2715806 A1 CA 2715806A1
- Authority
- CA
- Canada
- Prior art keywords
- explosive
- projectile
- casing
- liquid
- elastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
- F42B12/20—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
- F42B12/207—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type characterised by the explosive material or the construction of the high explosive warhead, e.g. insensitive ammunition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B33/00—Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor
- F42B33/02—Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges
- F42B33/0214—Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges by casting
Abstract
The invention relates to an explosive projectile (1, 1') and to a method for producing the latter, said projectile comprising a projectile shell (2). The aim of the invention is to reduce the risk of an unintentional detonation of the explosive (6) upon launching. To achieve this, the invention proposes a liquid explosive as the explosive (6), said liquid explosive not hardening and remaining in liquid form after being introduced into the interior (5) of the projectile shell (2). The explosive (6) is sealed in an airtight manner in an elastic casing (7) in the interior (5) of the projectile shell (2).
Description
DESCRIPTION
Explosive projectile and method for the production thereof The invention relates to an explosive projectile having a projectile casing which surrounds an internal area which is filled with an explosive. The invention furthermore relates to a method for producing the explosive projectile.
DE 23 45 070 B2 describes an encapsulated explosive which is made such that it can be handled easily, and DE 38 43 443 Al discloses an explosive body. Various explosive projectiles are disclosed, inter alia, in DE 602 02 419 T2, DE 601 08 817 T2, DE 20 2004 019 504 U1, DE 295 19 568 U1, DE 39 13 543 Cl and DE 196 26 660 C2.
Furthermore, EP 1 338 860 A2 discloses a method for producing a large-caliber explosive projectile, in which a plastic-bonded explosive charge is located in the internal area of the projectile casing and is incorporated in a plastic casing, which can be unfolded and is introduced into the projectile.
If an explosive in liquid form is used, the internal area of the projectile casing is filled with this explosive, which is then cured. In this case, shrinkage can occur, and cracks can possibly also be formed in the explosive, both during casting and during curing of the explosive. Shrinkage and cracks such as these represent a not insignificant safety risk because the shrinkage and cracks can very quickly change their shape because of the high acceleration when the explosive projectile is fired, and the heat in the shrinkage and cracks can be so severely heated because of the compression that this results in that this can lead to ignition of the corresponding explosive.
Explosive projectile and method for the production thereof The invention relates to an explosive projectile having a projectile casing which surrounds an internal area which is filled with an explosive. The invention furthermore relates to a method for producing the explosive projectile.
DE 23 45 070 B2 describes an encapsulated explosive which is made such that it can be handled easily, and DE 38 43 443 Al discloses an explosive body. Various explosive projectiles are disclosed, inter alia, in DE 602 02 419 T2, DE 601 08 817 T2, DE 20 2004 019 504 U1, DE 295 19 568 U1, DE 39 13 543 Cl and DE 196 26 660 C2.
Furthermore, EP 1 338 860 A2 discloses a method for producing a large-caliber explosive projectile, in which a plastic-bonded explosive charge is located in the internal area of the projectile casing and is incorporated in a plastic casing, which can be unfolded and is introduced into the projectile.
If an explosive in liquid form is used, the internal area of the projectile casing is filled with this explosive, which is then cured. In this case, shrinkage can occur, and cracks can possibly also be formed in the explosive, both during casting and during curing of the explosive. Shrinkage and cracks such as these represent a not insignificant safety risk because the shrinkage and cracks can very quickly change their shape because of the high acceleration when the explosive projectile is fired, and the heat in the shrinkage and cracks can be so severely heated because of the compression that this results in that this can lead to ignition of the corresponding explosive.
Therefore, in general, after the explosive has been introduced and cured, the explosive projectiles must be checked by means of an X-ray installation for shrinkage and cracks, and this is associated with a considerable time and cost penalty.
The invention is based on the object of specifying an explosive projectile in which the risk of inadvertent ignition of the explosive on firing is less than in the case of explosive projectiles with cured liquid explosive. A further aim of the invention is to disclose a method for producing an explosive projectile such as this.
According to the invention, this object is achieved with regard to the explosive projectile by the features of claim 1, and with regard to the method by the features of claim 7. Further, particularly advantageous refinements of the invention are disclosed in the dependent claims.
The invention is essentially based on the idea of using a liquid explosive as the explosive, which does not cure, but remains liquid, after being introduced into the internal area of the projectile casing. In this case, the explosive in the internal area of the projectile casing is arranged in an elastic casing, such that it is sealed in an air-tight manner.
The explosive projectile according to the invention has, inter alia, the advantage that it can be produced in a simple manner, since the explosive can be introduced into the casing, which, for example, is composed of plastic, while it is still outside the projectile casing, and can be sealed in an air-tight manner. This makes it possible to largely prevent the occurrence of air bubbles within the liquid explosive, for example by connection to an appropriate vacuum device, at this point in time. Once the casing has been closed in an air-tight manner, this is then introduced into the projectile casing, together with the explosive, for example from the mouth of the projectile casing, with the elastic casing reliably preventing the liquid explosive from inadvertently emerging from the projectile casing, or air from inadvertently entering the elastic casing.
The elastic casing must, of course, be composed of a material which is compatible not only with the explosive but also with the other materials used in the projectile (to the extent that they come into contact with the casing), such that the corresponding material characteristics are retained over a relatively long time period in the predetermined temperature range. It is not unusual for the purchaser of corresponding explosive projectiles to specify a useful live of, for example, 25 years for such projectiles.
Preferably, the elastic casing is adhesively bonded in one subarea to the inner wall of the projectile casing.
This means that the liquid explosive cannot move in an undefined manner in the internal area of the projectile casing. In this case, a free space should remain between the elastic casing and the projectile casing, in order to allow the elastic casing to expand in the event of thermal expansion of the explosive within the internal area, without deformation of the projectile casing.
By way of example, the volume equalizing element may consist of a container which is filled with a compressible gas or a compressible liquid. The volume equalizing element is preshaped, and is matched to the planned position in the projectile ogive. During insertion into the projectile, in a vacuum or at a reduced pressure, the volume equalizing element is preferably folded or compressed. The preshaping of the volume equalizing element and the gas contained in it relieves the load on the body after insertion again, and, for example, merges itself into the ogive or onto it. The adhesive should be applied in advance in the area of the ogive, where the volume equalizing element is seated, in order to create a uniform adhesive layer.
The adhesive can preferably be applied by spraying it on.
Particularly when using explosive projectiles with nose fuzes, care must be taken when choosing the free space arranged at the front to ensure that the distance between the elastic casing or the liquid explosive and the fuze is not too great, in order to reliably ensure defined initiation of the explosive.
Further details and advantages of the invention will become evident from the following exemplary embodiments, which will be explained with reference to the figures, in which:
Figure 1 shows a longitudinal section through a schematically illustrated spin-stabilized explosive projectile (artillery projectile) without a nose fuze, with liquid explosive arranged in the internal area of the projectile casing, and with a free space being provided at the front, and Figure 2 shows a view corresponding to Figure 1, with a volume equalizing element which fills the free space being arranged at the front.
In Figure 1, 1 denotes a spin-stabilized explosive projectile which can be fired, for example, from an armored howitzer and has a projectile casing 2 composed of steel, which has an opening 3 at the front into which an impact fuze, which is not illustrated, can be screwed.
An internal area 5 is located in the projectile casing 2, which internal area 5 extends in the direction of the longitudinal axis 4 of the explosive projectile 1 and holds explosive 6. In this case, according to the invention, the explosive 6 is a liquid explosive, which is surrounded completely and in an air-tight manner by an elastic casing 7.
In the rear area of the projectile casing 2, the elastic casing 7 is adhesively bonded to the inner wall 11 of the projectile casing 2, while a free space 9 remains at the front between the elastic casing 7 and the projectile casing 2. This free space 9 is on the one hand chosen such that the elastic casing 7, and therefore the liquid explosive 6, can expand without any impediment when temperature changes occur. On the other hand, the distance between the elastic casing 7 and the fuze, which is not illustrated, is chosen so as to reliably ensure that the fuze initiates the liquid explosive 6.
In order to produce the explosive projectile 1, liquid explosive 6 is first of all introduced into the elastic casing 7, and this is then sealed in an air-tight manner. The elastic casing 7, with the liquid explosive 6 located in it, is then introduced through the opening 3 into the internal area 5 of the projectile casing 2, and is adhesively bonded to the projectile casing 2 at the rear. The corresponding adhesive layer has been annotated with the reference symbol 10 in Figure 1.
Figure 2 shows an explosive projectile 1' which corresponds substantially to the explosive projectile 1 described above. The only difference is that the free space 9 provided in the explosive projectile 1 is filled by an elastic volume equalizing element 100, which is prestressed. In this case, this volume equalizing element 100 consists of a container 101 (for example of a plastic film) in which a compressible gas (or possibly a compressible liquid) is located. When the liquid explosive is heated, the volume equalizing element 100 is then compressed by the expansion of the explosive 6. When the liquid explosive 6 cools down, the volume equalizing element 100 in contrast expands, in order in this case to compensate for shrinkage of the explosive.
The invention is based on the object of specifying an explosive projectile in which the risk of inadvertent ignition of the explosive on firing is less than in the case of explosive projectiles with cured liquid explosive. A further aim of the invention is to disclose a method for producing an explosive projectile such as this.
According to the invention, this object is achieved with regard to the explosive projectile by the features of claim 1, and with regard to the method by the features of claim 7. Further, particularly advantageous refinements of the invention are disclosed in the dependent claims.
The invention is essentially based on the idea of using a liquid explosive as the explosive, which does not cure, but remains liquid, after being introduced into the internal area of the projectile casing. In this case, the explosive in the internal area of the projectile casing is arranged in an elastic casing, such that it is sealed in an air-tight manner.
The explosive projectile according to the invention has, inter alia, the advantage that it can be produced in a simple manner, since the explosive can be introduced into the casing, which, for example, is composed of plastic, while it is still outside the projectile casing, and can be sealed in an air-tight manner. This makes it possible to largely prevent the occurrence of air bubbles within the liquid explosive, for example by connection to an appropriate vacuum device, at this point in time. Once the casing has been closed in an air-tight manner, this is then introduced into the projectile casing, together with the explosive, for example from the mouth of the projectile casing, with the elastic casing reliably preventing the liquid explosive from inadvertently emerging from the projectile casing, or air from inadvertently entering the elastic casing.
The elastic casing must, of course, be composed of a material which is compatible not only with the explosive but also with the other materials used in the projectile (to the extent that they come into contact with the casing), such that the corresponding material characteristics are retained over a relatively long time period in the predetermined temperature range. It is not unusual for the purchaser of corresponding explosive projectiles to specify a useful live of, for example, 25 years for such projectiles.
Preferably, the elastic casing is adhesively bonded in one subarea to the inner wall of the projectile casing.
This means that the liquid explosive cannot move in an undefined manner in the internal area of the projectile casing. In this case, a free space should remain between the elastic casing and the projectile casing, in order to allow the elastic casing to expand in the event of thermal expansion of the explosive within the internal area, without deformation of the projectile casing.
By way of example, the volume equalizing element may consist of a container which is filled with a compressible gas or a compressible liquid. The volume equalizing element is preshaped, and is matched to the planned position in the projectile ogive. During insertion into the projectile, in a vacuum or at a reduced pressure, the volume equalizing element is preferably folded or compressed. The preshaping of the volume equalizing element and the gas contained in it relieves the load on the body after insertion again, and, for example, merges itself into the ogive or onto it. The adhesive should be applied in advance in the area of the ogive, where the volume equalizing element is seated, in order to create a uniform adhesive layer.
The adhesive can preferably be applied by spraying it on.
Particularly when using explosive projectiles with nose fuzes, care must be taken when choosing the free space arranged at the front to ensure that the distance between the elastic casing or the liquid explosive and the fuze is not too great, in order to reliably ensure defined initiation of the explosive.
Further details and advantages of the invention will become evident from the following exemplary embodiments, which will be explained with reference to the figures, in which:
Figure 1 shows a longitudinal section through a schematically illustrated spin-stabilized explosive projectile (artillery projectile) without a nose fuze, with liquid explosive arranged in the internal area of the projectile casing, and with a free space being provided at the front, and Figure 2 shows a view corresponding to Figure 1, with a volume equalizing element which fills the free space being arranged at the front.
In Figure 1, 1 denotes a spin-stabilized explosive projectile which can be fired, for example, from an armored howitzer and has a projectile casing 2 composed of steel, which has an opening 3 at the front into which an impact fuze, which is not illustrated, can be screwed.
An internal area 5 is located in the projectile casing 2, which internal area 5 extends in the direction of the longitudinal axis 4 of the explosive projectile 1 and holds explosive 6. In this case, according to the invention, the explosive 6 is a liquid explosive, which is surrounded completely and in an air-tight manner by an elastic casing 7.
In the rear area of the projectile casing 2, the elastic casing 7 is adhesively bonded to the inner wall 11 of the projectile casing 2, while a free space 9 remains at the front between the elastic casing 7 and the projectile casing 2. This free space 9 is on the one hand chosen such that the elastic casing 7, and therefore the liquid explosive 6, can expand without any impediment when temperature changes occur. On the other hand, the distance between the elastic casing 7 and the fuze, which is not illustrated, is chosen so as to reliably ensure that the fuze initiates the liquid explosive 6.
In order to produce the explosive projectile 1, liquid explosive 6 is first of all introduced into the elastic casing 7, and this is then sealed in an air-tight manner. The elastic casing 7, with the liquid explosive 6 located in it, is then introduced through the opening 3 into the internal area 5 of the projectile casing 2, and is adhesively bonded to the projectile casing 2 at the rear. The corresponding adhesive layer has been annotated with the reference symbol 10 in Figure 1.
Figure 2 shows an explosive projectile 1' which corresponds substantially to the explosive projectile 1 described above. The only difference is that the free space 9 provided in the explosive projectile 1 is filled by an elastic volume equalizing element 100, which is prestressed. In this case, this volume equalizing element 100 consists of a container 101 (for example of a plastic film) in which a compressible gas (or possibly a compressible liquid) is located. When the liquid explosive is heated, the volume equalizing element 100 is then compressed by the expansion of the explosive 6. When the liquid explosive 6 cools down, the volume equalizing element 100 in contrast expands, in order in this case to compensate for shrinkage of the explosive.
List of reference symbols 1, 1' Explosive projectile, projectile 2 Projectile casing 3 Opening 4 Longitudinal axis Internal area 6 Explosive, liquid explosive 7 Elastic casing 9 Free space Adhesive layer 11 Inner wall 100 Volume equalizing element 101 Container
Claims (8)
1. An explosive projectile having a projectile casing (2) which surrounds an internal area (5) which is filled with an explosive (6), characterized in that the explosive (6) is a liquid explosive which is surrounded in a completely air-tight manner by an elastic casing (7).
2. The explosive projectile as claimed in claim 1, characterized in that a free space (9) remains in the internal area (5) of the projectile casing (2), between the explosive (6), which is surrounded by the elastic casing (7), and the inner wall, which free space (9) is chosen such that the elastic casing (7) can expand in the event of temperature fluctuations of the liquid explosive (6).
3. The explosive projectile as claimed in claim 2, characterized in that the free space (9) is filled by an elastic volume equalizing element (100).
4. The explosive projectile as claimed in claim 3, characterized in that the volume equalizing element (100) consists of a container (101) which is filled with a compressible gas or a compressible liquid.
5. The explosive projectile as claimed in one of claims 1 to 4, characterized in that the elastic casing (7) which surrounds the liquid explosive (6) is adhesively bonded in one subarea to the inner wall (11) of the projectile casing (2).
6. The explosive projectile as claimed in claim 5 in conjunction with one of claims 2 to 4, characterized in that the elastic casing (7) is adhesively bonded to the projectile casing (2) in the rear area thereof, and in that the free space (9) which remains between the elastic casing (7) and the projectile casing (2) is arranged in the front area of the internal area (5).
7. A method for producing an explosive projectile as claimed in one of claims 1 to 6, characterized in that liquid explosive (6) is first of all introduced into the elastic casing (7), and this is then sealed in an air-tight manner, and in that the elastic casing (7), with the liquid explosive (6) located in it, is then introduced through an opening (3) into the internal area (5) of the projectile casing (2), and is adhesively bonded to it at the rear.
8. The method as claimed in claim 7, characterized in that the amount of liquid explosive (6) is chosen such that, after the liquid explosive (6) has been introduced into the internal area (5) of the projectile casing (2), a free space (9) remains which is then filled with a volume equalizing element (100).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200810010707 DE102008010707A1 (en) | 2008-02-22 | 2008-02-22 | Explosive projectile and method for its production |
| DE102008010707.7 | 2008-02-22 | ||
| PCT/EP2009/000675 WO2009103409A1 (en) | 2008-02-22 | 2009-02-03 | Explosive projectile and method for the production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2715806A1 true CA2715806A1 (en) | 2009-08-27 |
Family
ID=40677753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2715806A Abandoned CA2715806A1 (en) | 2008-02-22 | 2009-02-03 | Explosive projectile and method for the production thereof |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2245419B1 (en) |
| CA (1) | CA2715806A1 (en) |
| DE (1) | DE102008010707A1 (en) |
| WO (1) | WO2009103409A1 (en) |
| ZA (1) | ZA201005625B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011100788A1 (en) | 2011-05-06 | 2012-11-08 | Rheinmetall Waffe Munition Gmbh | Projectile, in particular explosive projectile |
| DE102015005982A1 (en) * | 2015-05-08 | 2016-11-10 | Diehl Bgt Defence Gmbh & Co. Kg | Explosive charge for inclusion in a projectile shell and projectile |
| DE102016008391B4 (en) | 2016-07-09 | 2018-05-24 | Diehl Defence Gmbh & Co. Kg | bullet |
| DE202020004242U1 (en) | 2020-10-08 | 2022-01-11 | Josef Zambelli | Projectile of a projectile with improved acceleration in the barrel of a gun |
| DE102020006200A1 (en) | 2020-10-08 | 2022-04-14 | Josef Zambelli | PROCEDURE FOR IMPROVED ACCELERATION OF THE PROJECTILE OF A BULLET |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2373883A (en) | 1942-10-30 | 1945-04-17 | Clyde B Ferrel | Shell structure |
| US4011818A (en) * | 1976-04-01 | 1977-03-15 | The United States Of America As Represented By The Secretary Of The Navy | Warhead explosive liner |
| GB2251482B (en) | 1987-06-09 | 1993-09-22 | Royal Ordnance Plc | Explosive devices |
| DE3913543C1 (en) | 1989-04-25 | 1990-10-31 | Messerschmitt-Boelkow-Blohm Gmbh, 8012 Ottobrunn, De | One-piece projectile housing - has recess which allows mfr. from rear |
| DE29519568U1 (en) | 1995-12-09 | 1997-04-03 | Diehl Gmbh & Co | Explosive storey |
| DE19626660C2 (en) | 1996-07-03 | 2002-06-27 | Diehl Stiftung & Co | explosive projectile |
| FR2812385B1 (en) | 2000-07-28 | 2003-02-21 | Giat Ind Sa | EXPLOSIVE AMMUNITION WITH FRAGMENTABLE BODY |
| FR2830931B1 (en) | 2001-10-12 | 2004-04-02 | Giat Ind Sa | EXPLOSIVE AMMUNITION |
| DE10207209A1 (en) | 2002-02-21 | 2003-09-11 | Rheinmetall W & M Gmbh | Process for producing a large-caliber explosive projectile and an explosive projectile produced by this process |
| DE102004045361B3 (en) * | 2004-09-18 | 2006-05-11 | TDW Gesellschaft für verteidigungstechnische Wirksysteme mbH | Preparation of a hollow explosive charge involving:production of initial bore and fixing of base plate and detonation wave body generally useful for operations invoving explosive charges ensuring reproducible detonation waves |
| DE202004019504U1 (en) | 2004-12-17 | 2006-04-20 | Diehl Bgt Defence Gmbh & Co. Kg | Explosive projectile comprises detonator, non-sensitive charge, sleeve with opening for base screw, and concrete breaking head |
| DE102005050973A1 (en) * | 2005-10-25 | 2007-04-26 | Rheinmetall Waffe Munition Gmbh | explosive projectile |
-
2008
- 2008-02-22 DE DE200810010707 patent/DE102008010707A1/en not_active Withdrawn
-
2009
- 2009-02-03 CA CA2715806A patent/CA2715806A1/en not_active Abandoned
- 2009-02-03 WO PCT/EP2009/000675 patent/WO2009103409A1/en active Application Filing
- 2009-02-03 EP EP09713362.3A patent/EP2245419B1/en not_active Not-in-force
-
2010
- 2010-08-05 ZA ZA2010/05625A patent/ZA201005625B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ZA201005625B (en) | 2011-04-28 |
| EP2245419B1 (en) | 2014-01-22 |
| DE102008010707A1 (en) | 2009-08-27 |
| EP2245419A1 (en) | 2010-11-03 |
| WO2009103409A1 (en) | 2009-08-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20130906 |
|
| FZDE | Dead |
Effective date: 20160718 |