EP0215183B1 - Insert for lining an explosive charge and for forming a bar-shaped projectile, and method for making the insert - Google Patents

Insert for lining an explosive charge and for forming a bar-shaped projectile, and method for making the insert Download PDF

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Publication number
EP0215183B1
EP0215183B1 EP86104896A EP86104896A EP0215183B1 EP 0215183 B1 EP0215183 B1 EP 0215183B1 EP 86104896 A EP86104896 A EP 86104896A EP 86104896 A EP86104896 A EP 86104896A EP 0215183 B1 EP0215183 B1 EP 0215183B1
Authority
EP
European Patent Office
Prior art keywords
insert
disc
accordance
projectile
hardening
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.)
Expired
Application number
EP86104896A
Other languages
German (de)
French (fr)
Other versions
EP0215183A1 (en
Inventor
Hendrik Lips
Jörg Dr. Peters
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rheinmetall Industrie AG
Original Assignee
Rheinmetall GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rheinmetall GmbH filed Critical Rheinmetall GmbH
Publication of EP0215183A1 publication Critical patent/EP0215183A1/en
Application granted granted Critical
Publication of EP0215183B1 publication Critical patent/EP0215183B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/032—Shaped or hollow charges characterised by the material of the liner

Definitions

  • a generic insert is known from DE-PS 3 317 352.
  • the rear-side projections on the projectile are to be ensured by regionally different wall thicknesses of the insert.
  • the invention has for its object to provide a generic insert and a method for its production, which is characterized by comparatively little effort with good results.
  • a flat disk 10.1 has a region 12.1 around its center 16 and regions 14 which extend radially inward from the circumference 18.
  • the disk 10.1 is hardened; it is soft-annealed in the areas 12.1 and 14 by localized heat supply, so that a coherent area 20.1 between the areas 12.1 and 14 has a higher strength than the latter. Subsequently, the disk 10.1 is pressed into the form of a hollow spherical cap.
  • the disk 10.1 can also be pressed to the carrot in the hardened state and then heat treated in the aforementioned manner.
  • areas 20.1 have a core hardness of approx. 130 HV and areas 12.1 and 14 have a hardness of only approx. 70 HV.
  • the transition between the areas is advantageously not sharp, but rather comparatively smooth. This will be discussed later.
  • the flat disk 10.2 according to FIG. 2 is produced as follows: A soft-annealed flat disk with an oversize in thickness and diameter is cold deformed by pressure in the outer area. The cold deformation is about 20%. The disc treated in this way is machined to the target dimension in thickness and diameter to disc 10.2. Areas 20.2 solidified by pressure are delimited on the outside by the circumference 18 and delimited on the inside by a soft-annealed area 12.2 by the sides of an inscribed equilateral hexagon. In a variant not shown, the areas 20.2 are delimited on the inside by comparatively shorter secants compared to the area 12.2, which is then delimited on the outside by finite sections of the circumference 18.
  • the pressure for work hardening can be applied by a (two) hollow stamp hexagonal cross-section on the top or bottom (both sides).
  • the disk 10.2 is pressed for insertion in the form of a hollow spherical cap.
  • the flat disk 10.3 according to FIG. 3 also arises from a soft-annealed flat disk with an oversize in thickness and diameter.
  • the areas 20.3 are cold-deformed and consolidated by pressing from the top or bottom (on both sides) by means of a (two) punch with projections, the end faces of which have a specifiable crowning with a predeterminable diameter.
  • a radial deformation gradient can be set in the regions 20.3 in a simple manner by forming the end faces of the projections of the stamp. This avoids a comparatively sharp transition between the areas 20.3 and the surrounding and central areas 12.3.
  • processing is carried out to the required dimension according to thickness and diameter to the plane disc 10.3 shown and pressing the latter to insert.
  • FIG. 4 in the projectile 22 shown, the areas in question are provided with the reference symbols in connection with FIGS. 2 and 3.
  • the higher strength is used at 20.3 to avoid constriction of the rod-shaped projectile body and at 20.2 to shape the rear side for aerodynamic stabilization of the projectile trajectory.
  • Influencing the material properties by thermal and / or mechanical treatment not only proves to be considerably easier than in the known prior art, but also allows freedom of movement in the design of the projectile to be blasted within wide limits.
  • the above-mentioned smooth transitions between the areas mentioned avoid undesired material separations during explosive forming and flight of the projectile. Editing the printed insert to the final dimension (possibly turning a chamfer) is comparatively simple with the inserts according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Eine gattungsgleiche Einlage ist bekannt aus der DE-PS 3 317 352. Bei ihr sollen durch bereichsweise unterschiedliche Wandstärken der Einlage die heckseitigen Ausformungen am Projektil gewährleistet werden.A generic insert is known from DE-PS 3 317 352. In it, the rear-side projections on the projectile are to be ensured by regionally different wall thicknesses of the insert.

Nachteilig ist hierbei der große Fertigungsaufwand, welcher durch die Ergebnisse nicht gerechtfertigt ist: Schädliche Werkstofftrennungen lassen sich nicht vermeiden.The disadvantage here is the large manufacturing effort, which is not justified by the results: Harmful material separations cannot be avoided.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgleiche Einlage und ein Verfahren zu ihrer Herstellung zu schaffen, welches sich durch vergleichsweise geringen Aufwand bei guten Ergebnissen auszeichnet.The invention has for its object to provide a generic insert and a method for its production, which is characterized by comparatively little effort with good results.

Gelöst wird diese Aufgabe durch die technische Lehre nach dem Patentanspruch 1 mit erfinderischen Merkmalen in dessen Kennzeichen sowie die technischen Lehren nach den sich anschließenden Verfahrensansprüchen.This object is achieved by the technical teaching according to claim 1 with inventive features in its characteristics and the technical teaching according to the subsequent method claims.

Die Erfindung wird nachstehend anhand dreier in der Zeichnung dargestellter Ausführungsbeispiele näher erläutert; hierbei werden jeweilige Vorteile besonders erwähnt.The invention is explained below with reference to three exemplary embodiments shown in the drawing; respective advantages are particularly mentioned here.

Es zeigen:

  • Figuren 1, 2 und 3 ein erstes, zweites und drittes Ausführungsbeispiel nach der Erfindung an einer ebenen Scheibe zum Ausformen der Einlage und
  • Figur 4 ein aus der Einlage sprenggeformtes Projektil im seitlichen Aufriß.
Show it:
  • Figures 1, 2 and 3, a first, second and third embodiment of the invention on a flat disc for molding the insert and
  • Figure 4 is an exploded from the insert projectile in side elevation.

Gemäß Fig. 1 weist eine ebene Scheibe 10.1 um ihren Mittelpunkt 16 einen Bereich 12.1 und sich vom Umfang 18 radial nach innen erstreckende Bereiche 14 auf. Die Scheibe 10.1 ist gehärtet; sie wird in den Bereichen 12.1 und 14 durch lokalisierte Wärmezufuhr weichgeglüht, so daß ein zusammenhängender Bereich 20.1 zwischen den Bereichen 12.1 und 14 eine höhere Festigkeit als letzterer aufweist. Anschließend wird die Scheibe 10.1 zur Einlage in Form einer Hohlkugelkalotte gedrückt.1, a flat disk 10.1 has a region 12.1 around its center 16 and regions 14 which extend radially inward from the circumference 18. The disk 10.1 is hardened; it is soft-annealed in the areas 12.1 and 14 by localized heat supply, so that a coherent area 20.1 between the areas 12.1 and 14 has a higher strength than the latter. Subsequently, the disk 10.1 is pressed into the form of a hollow spherical cap.

Die Scheibe 10.1 kann auch im gehärteten Zustand zur Karlotte gedrückt und anschließend in der vorgenannten Weise warm behandelt werden.The disk 10.1 can also be pressed to the carrot in the hardened state and then heat treated in the aforementioned manner.

Besteht die Scheibe aus Armco-Eisen, weisen die Bereiche 20.1 eine Kernhärte von ca. 130 HV und die Bereiche 12.1 und 14 eine Härte von nur ca. 70 HV auf. Vorteilhafterweise ist der Übergang zwischen den Bereichen nicht scharf, sondern vergleichsweise fließend. Hierauf wird noch eingegangen werden.If the disc is made of Armco iron, areas 20.1 have a core hardness of approx. 130 HV and areas 12.1 and 14 have a hardness of only approx. 70 HV. The transition between the areas is advantageously not sharp, but rather comparatively smooth. This will be discussed later.

Die ebene Scheibe 10.2 nach Fig. 2 entsteht folgendermaßen: Eine weichgeglühte ebene Scheibe mit Übermaß in Dicke und Durchmesser wird durch Druck im Außenbereich kalt verformt. Die Kaltverformung beträgt etwa 20%. Die dieser Art behandelte Scheibe wird auf Sollmaß in Dicke und Durchmesser zur Scheibe 10.2 bearbeitet. Durch Druck verfestigte Bereiche 20.2 werden außenseitig durch den Umfang 18 begrenzt und innenseitig durch die Seiten eines einbeschriebenen gleichseitigen Sechsecks von einem weichgeglühten Bereich 12.2 abgegrenzt. Bei einer nicht dargestellten Variante werden die Bereiche 20.2 innenseitig von vergleichsweise kürzeren Sekanten gegenüber dem Bereich 12.2 abgegrenzt, welcher dann seinerseits von endlichen Abschnitten des Umfangs 18 außenseitig begrenzt wird. Der Druck zur Kaltverfestigung kann durch eine (zwei) Hohlstempel sechseckigen Querschnitts ober- oder unterseitig (beidseitig) aufgebracht werden. Zum Anschluß an die erwähnte Bearbeitung auf Sollmaß wird die Scheibe 10.2 zur Einlage in Form einer Hohlkugelkalotte gedrückt. Durch Abrunden der Druckflächen des Stempels (der Stempel) im Bereich der Begrenzung zum Bereich 12.2 kann auch hier auf einfache Weise ein fließender Übergang zwischen den genannten Bereichen erzielt werden.The flat disk 10.2 according to FIG. 2 is produced as follows: A soft-annealed flat disk with an oversize in thickness and diameter is cold deformed by pressure in the outer area. The cold deformation is about 20%. The disc treated in this way is machined to the target dimension in thickness and diameter to disc 10.2. Areas 20.2 solidified by pressure are delimited on the outside by the circumference 18 and delimited on the inside by a soft-annealed area 12.2 by the sides of an inscribed equilateral hexagon. In a variant not shown, the areas 20.2 are delimited on the inside by comparatively shorter secants compared to the area 12.2, which is then delimited on the outside by finite sections of the circumference 18. The pressure for work hardening can be applied by a (two) hollow stamp hexagonal cross-section on the top or bottom (both sides). To connect to the above-mentioned machining to the desired dimension, the disk 10.2 is pressed for insertion in the form of a hollow spherical cap. By rounding off the printing surfaces of the stamp (the stamp) in the region of the boundary to the region 12.2, a smooth transition between the regions mentioned can also be achieved here in a simple manner.

Auch die ebene Scheibe 10.3 nach Fig. 3 entsteht aus einer weichgeglühten ebenen Scheibe mit Übermaß in Dicke und Durchmesser. Durch einen (zwei) Stempel mit Vorsprüngen, deren Stirnflächen bei vorgebbarem Durchmesser eine vorgebbare Balligkeit aufweisen, werden die Bereiche 20.3 durch Drücken von der Ober- oder Unterseite (beidseitig) kaltverformt und -verfestigt. Dabei kann in den Bereichen 20.3 ein radialer Verformungsgradient auf einfache Weise durch Ausbilden der Stirnflächen der Vorsprünge des Stempels eingestellt werden. Hierdurch läßt sich ein vergleichsweise scharfer Übergang zwischen den Bereichen 20.3 und dem umgebenden und Zentralbereich 12.3 vermeiden. Nach dem Kaltverfestigen erfolgt das Bearbeiten auf Sollmaß nach Dicke und Durchmesser zur dargestellten Ebenenscheibe 10.3 und Drücken letzterer zur Einlage.The flat disk 10.3 according to FIG. 3 also arises from a soft-annealed flat disk with an oversize in thickness and diameter. The areas 20.3 are cold-deformed and consolidated by pressing from the top or bottom (on both sides) by means of a (two) punch with projections, the end faces of which have a specifiable crowning with a predeterminable diameter. A radial deformation gradient can be set in the regions 20.3 in a simple manner by forming the end faces of the projections of the stamp. This avoids a comparatively sharp transition between the areas 20.3 and the surrounding and central areas 12.3. After work hardening, processing is carried out to the required dimension according to thickness and diameter to the plane disc 10.3 shown and pressing the latter to insert.

Die vorgeschilderten Maßnahmen lassen sich zum Erzielen gewünschter Wirkungen variieren und/oder kombinieren. Dies läßt Fig. 4 erkennen: bei dem dargestellten Projektil 22 sind die betreffenden Bereiche mit den Bezugszeichen im Zusammenhang mit den Fig. 2 und 3 versehen. Die höhere Festigkeit dient bei 20.3 dem Vermeiden einer Einschnürung des stabförmigen Projektilkörpers und bei 20.2 der heckseitigen Ausformung zur aerodynamischen Stabilisierung der Projektilflugbahn.The measures described can be varied and / or combined to achieve desired effects. This can be seen in FIG. 4: in the projectile 22 shown, the areas in question are provided with the reference symbols in connection with FIGS. 2 and 3. The higher strength is used at 20.3 to avoid constriction of the rod-shaped projectile body and at 20.2 to shape the rear side for aerodynamic stabilization of the projectile trajectory.

Das Beeinflussen der Werkstoffeigenschaften durch thermisches und/oder mechanisches Behandeln erweist sich gegenüber dem bekannten Stand der Technik nicht nur als wesentlich einfacher, sondern es ermöglicht auch innerhalb weiter Grenzen Freizügigkeit im Gestalten des sprengzuformenden Projektils. Durch die erwähnten fließenden Übergänge zwischen den genannten Bereichen werden unerwünschte Werkstofftrennungen beim Sprengumformen und Fluge des Projektils vermieden. Ein Bearbeiten der bedrückten Einlage auf Einbauendmaß (ggfs. Andrehen einer Fase) ist bei den Einlagen nach der Erfindung vergleichsweise einfach.Influencing the material properties by thermal and / or mechanical treatment not only proves to be considerably easier than in the known prior art, but also allows freedom of movement in the design of the projectile to be blasted within wide limits. The above-mentioned smooth transitions between the areas mentioned avoid undesired material separations during explosive forming and flight of the projectile. Editing the printed insert to the final dimension (possibly turning a chamfer) is comparatively simple with the inserts according to the invention.

Claims (8)

1. Insert, substantially the shape of a hollow spherical cap, for lining an explosive charge and forming a bar-shaped projectile, with shaped parts on the tail which serve for the aerodynamic stabilisation of the flight path of the projectile and with zones which are grouped symmetrically around the centre of the insert and which differ from their immediate surroundings, characterised by the fact that the insert has zones (12.1, 20.1, 14; 12, 2, 20.2; 12.3, 20.3) with material of different properties, which alter the dynamic characteristics of the material in a preselected manner during the formation of the projectile.
2. Process for the production of an insert in accordance with Claim 1, characterised by the following steps in the process:
a) preparation of a flat disc by hardening (10.1),
b) pressing the flat disc (10.1) to form a spherical cap, and
c) localised soft-annealing of zones (10.1) and (14).
3. Process in accordance with the generic part of Claim 2 and step (a) of the characterising part, characterised by the reversal of the order in which steps (b) and (c) are carried out.
4. Process for the production of an insert in accordance with Claim 1, characterised by the following steps in the process:
a) a flat disc (10.2, 10.3) with a larger than required diameter and wall-thickness is soft-annealed,
b) zones (20.2, 20.3) are strain-hardened (consolidated),
c) the disc (10.2, 10.3) is worked to the required dimension, and
d) the disc is pressed into the shape of a spherical cap.
5. Process in accordance with Claim 4, characterised by the strain-hardening being effected by exerting pressure on the disc from the upper side.
6. Process in accordance with Claim 4, characterised by the strain-hardening being effected by pressing the disc from the top and from the bottom.
7. Process in accordance with Claim 4, characterised by the strain-hardening being effected by pressing the disc from the bottom.
8. Process in accordance with the generic part and the characteristics a), b) and d) of the characterising part of Claim 4 and any one of Claims 5, 6 or 7, characterised by the fact that the spherical cap is worked to the required dimension.
EP86104896A 1985-07-18 1986-04-10 Insert for lining an explosive charge and for forming a bar-shaped projectile, and method for making the insert Expired EP0215183B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3525613 1985-07-18
DE19853525613 DE3525613A1 (en) 1985-07-18 1985-07-18 INSERT FOR PUTTING A BLAST CHARGE AND FORMING A ROD-SHAPED PROJECTILE AND METHOD FOR PRODUCING THE INSERT

Publications (2)

Publication Number Publication Date
EP0215183A1 EP0215183A1 (en) 1987-03-25
EP0215183B1 true EP0215183B1 (en) 1989-02-15

Family

ID=6276058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104896A Expired EP0215183B1 (en) 1985-07-18 1986-04-10 Insert for lining an explosive charge and for forming a bar-shaped projectile, and method for making the insert

Country Status (6)

Country Link
US (1) US4714019A (en)
EP (1) EP0215183B1 (en)
JP (1) JPS6219700A (en)
DE (2) DE3525613A1 (en)
ES (2) ES8900199A1 (en)
NO (1) NO161402C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3628622C1 (en) * 1986-08-22 1996-08-08 Fraunhofer Ges Forschung Device for producing projectiles by means of explosions
DE3830527A1 (en) * 1988-09-08 1990-03-22 Diehl Gmbh & Co PROJECT-FORMING INSERT FOR HOLLOW LOADS AND METHOD FOR PRODUCING THE INSERT
US5365852A (en) * 1989-01-09 1994-11-22 Aerojet-General Corporation Method and apparatus for providing an explosively formed penetrator having fins
SE502461C2 (en) * 1991-07-01 1995-10-23 Bofors Ab Method of projectile-forming explosive charges
FR2681677B1 (en) * 1991-09-20 1995-01-27 Thomson Brandt Armements EXPLOSIVE CHARGE WITH COATING WITH DISTRIBUTED MECHANICAL PROPERTIES.
DE4213318C2 (en) * 1992-04-23 2000-04-13 Rheinmetall W & M Gmbh Method of making a cargo insert
WO1994025414A1 (en) * 1993-05-04 1994-11-10 Alliant Techsystems Inc. Improved propellant system
US5892172A (en) * 1997-04-22 1999-04-06 Alliant Techsystems Inc. Propellant system
US6505559B1 (en) * 2000-09-14 2003-01-14 Owen Oil Tools, Inc. Well bore cutting and perforating devices and methods of manufacture
DE102005044320B4 (en) 2005-09-16 2010-11-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Charge with a substantially cylindrical explosive device
CA2914605C (en) 2013-06-04 2018-12-11 Nissan Motor Co., Ltd. Molding method for removing separator distortion, and molding device for removing separator distortion

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765177A (en) * 1959-12-30 1973-10-16 Thiokol Chemical Corp Rocket motor with blast tube and case bonded propellant
US3722421A (en) * 1962-04-04 1973-03-27 Us Army Solid bipropellant
US3429264A (en) * 1965-12-01 1969-02-25 Nitrochemie Gmbh Solid rocket propellants
FR1603394A (en) * 1968-10-15 1971-04-13
US3745199A (en) * 1968-12-23 1973-07-10 Us Army Method of making an improved case-bonded end-burning propellant grain with restricted stress-relief ports
FR2234465A1 (en) * 1973-06-19 1975-01-17 Poudres & Explosifs Ste Nale Cylindrical rocket propellant charge blocks - with central branched and eccentric axially directed channels
FR2429990B1 (en) * 1978-06-27 1985-11-15 Saint Louis Inst EXPLOSIVE FLAT CHARGE
FR2487966B1 (en) * 1980-08-01 1986-07-11 Serat IMPROVEMENTS ON COATINGS FOR FORMED EXPLOSIVE CHARGES
JPS5747789A (en) * 1980-09-01 1982-03-18 Nippon Oils & Fats Co Ltd Sheet-like gunpowder, manufacture and use
FR2512539B1 (en) * 1981-09-04 1986-01-24 Saint Louis Inst HOLLOW LOAD
DE3317352C2 (en) * 1983-05-13 1985-03-07 Diehl GmbH & Co, 8500 Nürnberg Insert for a projectile-forming charge
US4594945A (en) * 1984-11-28 1986-06-17 General Dynamics, Pomona Division Thermal protection for propellant grains

Also Published As

Publication number Publication date
ES557528A0 (en) 1988-02-16
ES8900199A1 (en) 1989-04-01
NO161402C (en) 1989-08-09
DE3662119D1 (en) 1989-03-23
NO861438L (en) 1987-01-19
EP0215183A1 (en) 1987-03-25
JPH042878B2 (en) 1992-01-21
US4714019A (en) 1987-12-22
JPS6219700A (en) 1987-01-28
NO161402B (en) 1989-05-02
ES555811A0 (en) 1989-04-01
ES8801558A1 (en) 1988-02-16
DE3525613A1 (en) 1987-01-22

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