IL156554A - Shell fragmenting casing with inner plastic layer and methods for manufacturing same - Google Patents
Shell fragmenting casing with inner plastic layer and methods for manufacturing sameInfo
- Publication number
- IL156554A IL156554A IL156554A IL15655403A IL156554A IL 156554 A IL156554 A IL 156554A IL 156554 A IL156554 A IL 156554A IL 15655403 A IL15655403 A IL 15655403A IL 156554 A IL156554 A IL 156554A
- Authority
- IL
- Israel
- Prior art keywords
- shell
- area
- plastics film
- plastics
- elastic
- Prior art date
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
- F42B12/22—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 with fragmentation-hull construction
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Making Paper Articles (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
Description
SHELL FRAGMENTING CASING WITH INNER PLASTIC LAYER AND METHODS FOR MANUFACTURING SAME Pearl Cohen Zedek Latzer P-5794-1L Shell with a fragmenting outer casing and methods for manufacturing same The invention relates to a shell with a fragmenting outer casing and a plastics film adjoining the internal face of the outer casing, in which plastics film an explosive charge is arranged. The invention relates further to methods for manufacturing such a shell.
A shell of this kind is known, for example, from DE-AS 1 812 462. In this shell the plastics film has a structured area which is provided with a plurality of roof-shaped indentations distributed uniformly on its periphery and facing inwardly, the indentations of adjacent rows being offset with respect to one another. Laterally adjoining the structured area of the plastics film is at least one smooth area of film with which the film rests form-fittingly against the internal wall of the outer casing. As far as the Applicant is aware an elastic propylene (propylene provided with a rubber-elastic admixture) is used as the material for the entire plastics film, i.e. the film comprising both areas.
Tests carried out by the Applicant have shown that the use of such plastic films, in particular in highly-accelerated shells (as used, for example, in modern tank and artillery munitions) is not to be recommended, at least if these shells contain a plastic-bound explosive, since the latter tends to be deformed at high accelerations. If an elastic film material is used, the explosive therefore presses the roof-shaped protuberances outwardly. This can cause fractures to form in the explosive, which can lead to unintended transformation of the explosive and therefore represent a safety risk.
It is the object of the invention to ensure in the case of a shell of the above-mentioned type that even when plastic-bound explosive is used no fracturing of the explosive occurs during the acceleration phase of the shell. In addition, methods for manufacturing such a shell are to be disclosed.
This object is achieved according to the invention by the features of Claim 1 with respect to the shell and by claims 4 and 5 with respect to the methods. Further, especially advantageous embodiments of the invention are disclosed by the subsidiary claims.
The invention is based essentially on the idea of using as the plastics film a film which consists of at least two areas having different strength characteristics. In the structured area the plastics film consists of a deformation-resistant material which prevents inward compression of the roof-shaped indentations by the explosive during the acceleration phase of the shell. In the smooth area, by contrast, the plastics film consists' of an elastic plastics material, so that 'the film in this area is pressed elastically and form-fittingly against the internal wall of the outer casing.
To manufacture the plastics film for the shell according to the invention the areas of deformation-resistant plastics material and of elastic plastics material can be manufactured separately by blow-moulding and then welded or bonded together or joined while in the fusible state during blow-moulding.
However, it is also possible during blow-moulding to manufacture different materials having the same base material segmentally, initially as a one-piece hose which then takes on its final contour in a blow mould. Because the process for producing the hose consisting segmentally of different materials in the blow-moulding machine is computer-controlled, exact reproduceability for the different areas is ensured in this low-cost procedure.
Polypropylene has again proved advantageous as the base material for the plastics film. By means of suitable admixtures a highly deformation-resistant material is obtained on the one hand and a suitably elastic material is obtained (e.g. by means of a rubber-elastic admixture) on the other.
Further details and advantages of the invention are apparent from the following embodiment elucidated wi reference to the Figure.
The Figure shows in a partially sectional side view an explosive shell firable by means of ail artillery weapon, the shell being illustrated in its state before the introduction of an explosive charge and the closure of the front mouth aperture with a percussion fuse.
The shell, which includes a fragmenting outer casing 2 of steel, is denoted by reference numeral 1. A plastics film 3 in which the explosive (not shown) is arranged is located inside the casing 2.
The plastics film 3 includes a central structured area 5 provided with the roof-shaped indentations 4. Adjoining this structured area 5 at the front and rear are respective smooth areas 7, 8 resting form-fittingly against the internal wall 6 of the outer casing 2.
According to the invention the structured area 5 of the plastics film 3 consists of a deformation-resistant plastics material, e.g. polypropylene, optionally glassfibre-reinforced, while the smooth areas 7, 8 of the plastics film 3 consist in each case of an elastic plastics material, e.g. a polypropylene provided with a rubber-elastic admixture.
In the embodiment illustrated the plastics film 3 for the shell 1 according to the invention is composed of separate partial films corresponding to the areas 5, 7, 8 and is welded together in the regions denoted by 9, 10, e.g. by means of ultrasound.
Self-evidently, the invention is not restricted to the above-described embodiment. For example, a different base material, in which the required strength characteristics are induced by appropriate admixtures; can be used instead of polypropylene as the material for the plastics film.
List of reference numerals 1 Shell 2 Casing 3 Plastics film 4 Indentation Structured area, area 6 Internal wall 7, 8 Smooth areas, area 9, 10 Areas
Claims (9)
1. A shell having a fragmenting outer casing (2) and a plastics film (3) adjoining the outer casing (2) on its internal face, in which plastics film (3) an explosive charge is arranged, with the features: a) the plastics film (3) has a structured area (5) provided with roof-shaped indentations (4) and at least one lateral smooth area (7, 8) adjoining the structured area (5) and form-fittingly resting against the internal wall (6) of the outer casing (2) ; b) the structured area (5) of the plastics film (3) consists of a deformation-resistant plastics material and the smooth area (7, 8) of an elastic plastics material.
2. Shell according to Claim 1, characterised in that the elastic plastics material is polypropylene which is provided with a rubber-elastic admixture.
3. Shell according to Claim 1 or 2 characterised in that the deformation-resistant plastics material is polypropylene .
4. A method for manufacturing a shell (1) according to one of claims 1 to 3 , characterised in that to manufacture the plastics film (3) the area (5) made of deformation-resistant plastics material and the area (7, 8) made of elastic plastics material are produced separately and in that the partial films corresponding to these areas (5, 7, 8) are then welded or bonded together or joined while in the fusible state during blow-moulding.
5. Method for manufacturing a shell (1) according to one of claims 1 to 3 , characterised in that to manufacture the plastics film (3) by blow-moulding from suitably different materials having the same base material, a one-piece hose is first manufactured and then takes on its final contour in a blow mould.
6. Shell according to any of claims 1-3 substantially as described hereinabove.
7. Shell according to any of claims 1-3 substantially as illustrated in any of the drawings.
8. A method according to any of claims 4,5 substantially as described hereinabove.
9. A method according to any of claims 4,5 substantially as illustrated in any of the drawings. For the Applicant Lawyers, Patent Attorneys & Notaries P-5794-IL
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10227955A DE10227955A1 (en) | 2002-06-22 | 2002-06-22 | Projectile with a splinter-forming outer shell and method for its production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL156554A0 IL156554A0 (en) | 2004-01-04 |
| IL156554A true IL156554A (en) | 2007-12-03 |
Family
ID=7714696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL156554A IL156554A (en) | 2002-06-22 | 2003-06-19 | Shell fragmenting casing with inner plastic layer and methods for manufacturing same |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1376047B1 (en) |
| DE (2) | DE10227955A1 (en) |
| ES (1) | ES2232795T3 (en) |
| IL (1) | IL156554A (en) |
| NO (1) | NO327310B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006034891A1 (en) * | 2006-07-25 | 2008-02-07 | Rheinmetall Waffe Munition Gmbh | liner |
| DE102012000011A1 (en) * | 2012-01-02 | 2013-07-04 | Rheinmetall Waffe Munition Gmbh | Spin-stabilized explosive projectile |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3491694A (en) * | 1954-06-08 | 1970-01-27 | Us Navy | Plastic liners for controlled fragmentation |
| CH485194A (en) * | 1968-01-25 | 1970-01-31 | Oerlikon Buehrle Ag | Bullet with fragmentation jacket |
| FR2741437B1 (en) * | 1995-11-16 | 1997-12-19 | Poudres & Explosifs Ste Nale | METHOD OF MANUFACTURING EXPLOSIVE ELEMENT WITH CONTROLLED FRAGMENTATION |
-
2002
- 2002-06-22 DE DE10227955A patent/DE10227955A1/en not_active Withdrawn
-
2003
- 2003-03-15 ES ES03005875T patent/ES2232795T3/en not_active Expired - Lifetime
- 2003-03-15 DE DE2003500188 patent/DE50300188D1/en not_active Expired - Fee Related
- 2003-03-15 EP EP03005875A patent/EP1376047B1/en not_active Expired - Lifetime
- 2003-03-19 NO NO20031258A patent/NO327310B1/en not_active IP Right Cessation
- 2003-06-19 IL IL156554A patent/IL156554A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NO20031258L (en) | 2003-12-23 |
| EP1376047A3 (en) | 2004-03-24 |
| EP1376047A2 (en) | 2004-01-02 |
| NO327310B1 (en) | 2009-06-02 |
| EP1376047B1 (en) | 2004-12-08 |
| DE10227955A1 (en) | 2004-01-15 |
| ES2232795T3 (en) | 2005-06-01 |
| NO20031258D0 (en) | 2003-03-19 |
| DE50300188D1 (en) | 2005-01-13 |
| IL156554A0 (en) | 2004-01-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FF | Patent granted | ||
| KB | Patent renewed | ||
| KB | Patent renewed | ||
| MM9K | Patent not in force due to non-payment of renewal fees |