EP0263204B1 - A linear cutting charge - Google Patents
A linear cutting charge Download PDFInfo
- Publication number
- EP0263204B1 EP0263204B1 EP86307745A EP86307745A EP0263204B1 EP 0263204 B1 EP0263204 B1 EP 0263204B1 EP 86307745 A EP86307745 A EP 86307745A EP 86307745 A EP86307745 A EP 86307745A EP 0263204 B1 EP0263204 B1 EP 0263204B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- charge
- casing
- groove
- bar
- liner
- 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 - Lifetime
Links
Images
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/08—Blasting cartridges, i.e. case and explosive with cavities in the charge, e.g. hollow-charge blasting cartridges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/28—Cartridge cases characterised by the material used, e.g. coatings
Definitions
- This invention relates to a hollow charge for linear cutting purposes.
- Hollow charges comprising a mass of explosive having a variously shaped cavity at one of its surfaces, the cavity being lined with a metal liner. Detonation of the charge violently compresses the metal liner converting it into an outwardly projected slug of metal, the shape of which is dependent upon the shape of the cavity.
- the slug has powerful penetrating properties which are utilized by detonating the charge with its cavity adjacent and facing a surface to be penetrated, i.e. the work surface. The penetration of the slug is dependent on the separation of the charge from the work surface, i.e. the stand-off distance, the optimum value of which is normally determined by experiment.
- a hollow charge known for linear cutting purposes comprises an elongated mass of explosive material having a cavity in the form of a V-shaped groove along its length, which mass is encased by a thin walled metal casing. Detonation produces a planar slug along the length of the groove which can be utilized for linear cutting.
- a lead tube is packed with explosive granules and then passed through a series of rollers arranged to form the packed tube into a bar of chevron cross-section thereby forming a lead- lined, V-shaped groove along the length of the bar.
- the present invention seeks to provide a linear cutting charge having a construction conducive to accurate and uniform formation of its effective dimensions.
- a linear cutting charge includes an explosive mass formed in the shape of a bar from a composite of explosive material and a first pliant material, the bar having a groove extending longitudinally along one of its faces, within which groove is located a continuous liner formed from a composite of particulate metal and a second pliant material.
- both the bar and the liner may be formed by extrusion, but formation may also be by other techniques, e.g. moulding or rolling.
- the particulate metal may advantageously be copper.
- the first and second pliant materials are chosen to be chemically compatible with the explosive material and are preferably identical.
- the groove has an outwardly widening, triangular cross-section and both the bar and the liner may be of chevron cross-section, the liner being bonded to the bar so as to cover the surfaces of the groove.
- the linear cutting charge further includes a casing which may advantageously be substantially rigid to prevent distortion of the bar and the liner during handling, which casing may advantageously include a spacing portion having an engagement surface for presentation to a work surface, which engagement surface is parallel to the outer edges of the liner and spaced therefrom, thereby to maintain an optimum stand-off distance.
- the casing may be flexible to facilitate cutting of curved surfaces and curved lines.
- stiffening means may be advantageously included, which may comprise metallic strips embedded in the casing normal to the engagement surface and extending longitudinally on either side of the groove, whereby the bending of the linear cutting charg e may be limited to lateral bending parallel with the engagement surface.
- the casing may advantageously include a groove filling portion of low density material to prevent the influx of dense material when, for example, the linear cutting charge is used underwater.
- the casing including the spacing portion and the groove filling portion may be integrally constructed from a low density flexible material such as expanded polyethylene.
- the linear cutting charge of Figures 1 and 2 has an explosive bar 1 of chevron cross-section having a groove 2 defined by the intersecting surfaces 3 and 4 which are included one to the other at an angle of 120 degrees.
- the bar 1 is formed by extrusion from a pliant mixture of 88% by weight of RDX (Cyclotrimethylene- trinitramine), 8.4% PIB (Polyisobutylene), 2.4% DEHS (2(Diethylhexyl) sebacate), and 1.2% PTFE (polytetrafluroethylene).
- RDX Cyclotrimethylene- trinitramine
- PIB Polyisobutylene
- DEHS Diethylhexyl
- PTFE polytetrafluroethylene
- the thickness of the bar measured in a direction normal to either of the faces 3 or 4 is 6.35 mm.
- a flexible casing 6 of expanded polyethylene surrounds the bar 1 except for the groove 2 and includes spacing portions 7 and 8 which protrude beyond the edges 9 of the liner 5 by a distance of 3.8mm which, for this configuration, is the optimum stand-off distance between the edges 9 and an engagement surface 12 presented to a work surface 10.
- the casing 6 and the bar 1 are bonded together by a compatible adhesive.
- the explosive bar 1 may conveniently be initiated by an electrically operated detonator (not shown) which may be affixed externally to the casing at one end of the linear cutting charge.
- FIG. 3 A second embodiment of the invention is illustrated in Figure 3 in which the bar 1 and liner 5 described with reference to Figures 1 and 2 are surrounded entirely by a casing 11 of a low density material such as expanded polyethylene having an engagement surface 12 which is placed in contact with a work surface 13.
- the casing 11 comprises a first portion 156 which is substantially the same as the casing 6 of Figure 1 and a groove filling portion 17 which is bonded to the first portion 16 at surfaces 18 and 19 by a suitable adhesive.
- Stiffening means comprising metallic strips 14 and 15 are embedded in the casing 11 on either side of the groove 2 and normal to the engagement surface 12, thereby limiting bending of the linear cutting charge to lateral bending parallel to the plane of the engagement surface 12.
- the casing may be of a rigid material such as polystyrene, and any casing may or may not include a groove filling portion.
- a groove filling portion may alternatively comprise a thin walled, air filled compartment, thereby excluding material from the groove and providing minimal resistance to the cutting slug generated by detonation of the charge.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Photoreceptors In Electrophotography (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Surgical Instruments (AREA)
- Dry Shavers And Clippers (AREA)
Abstract
Description
- This invention relates to a hollow charge for linear cutting purposes.
- Hollow charges are known comprising a mass of explosive having a variously shaped cavity at one of its surfaces, the cavity being lined with a metal liner. Detonation of the charge violently compresses the metal liner converting it into an outwardly projected slug of metal, the shape of which is dependent upon the shape of the cavity. The slug has powerful penetrating properties which are utilized by detonating the charge with its cavity adjacent and facing a surface to be penetrated, i.e. the work surface. The penetration of the slug is dependent on the separation of the charge from the work surface, i.e. the stand-off distance, the optimum value of which is normally determined by experiment.
- One particular example of a hollow charge known for linear cutting purposes comprises an elongated mass of explosive material having a cavity in the form of a V-shaped groove along its length, which mass is encased by a thin walled metal casing. Detonation produces a planar slug along the length of the groove which can be utilized for linear cutting. In a known method of manufacture of such linear cutting charges, a lead tube is packed with explosive granules and then passed through a series of rollers arranged to form the packed tube into a bar of chevron cross-section thereby forming a lead- lined, V-shaped groove along the length of the bar. The thickness of the lead wall encasing the two outer apices of the V-shaped groove is relied upon to space the charge from the work surface and thus defines the stand-off distance. Linear cutting charges so produced often have a non-uniform wall thickness and when these non-uniformities occur at the stand-off region or in the lining of the groove, variations in cutting efficiency and a lack of uniformity in cutting power results. See also US-A 3 185 089, which discloses a linear shaped charge of the type indicated with a liner of disconnected metallic elements to adapt the charge to be flexed in all directions and produce a greater flexibility in any particular direction.
- The present invention seeks to provide a linear cutting charge having a construction conducive to accurate and uniform formation of its effective dimensions.
- According to the present invention a linear cutting charge includes an explosive mass formed in the shape of a bar from a composite of explosive material and a first pliant material, the bar having a groove extending longitudinally along one of its faces, within which groove is located a continuous liner formed from a composite of particulate metal and a second pliant material.
- Preferably, both the bar and the liner may be formed by extrusion, but formation may also be by other techniques, e.g. moulding or rolling.
- The particulate metal may advantageously be copper.
- The first and second pliant materials are chosen to be chemically compatible with the explosive material and are preferably identical.
- Preferably, the groove has an outwardly widening, triangular cross-section and both the bar and the liner may be of chevron cross-section, the liner being bonded to the bar so as to cover the surfaces of the groove.
- Preferably the linear cutting charge further includes a casing which may advantageously be substantially rigid to prevent distortion of the bar and the liner during handling, which casing may advantageously include a spacing portion having an engagement surface for presentation to a work surface, which engagement surface is parallel to the outer edges of the liner and spaced therefrom, thereby to maintain an optimum stand-off distance. Alternatively the casing may be flexible to facilitate cutting of curved surfaces and curved lines.
- When the flexible charge is intended for cutting curved lines in a planar surface, stiffening means may be advantageously included, which may comprise metallic strips embedded in the casing normal to the engagement surface and extending longitudinally on either side of the groove, whereby the bending of the linear cutting charg e may be limited to lateral bending parallel with the engagement surface.
- The presence of dense material in the groove is detrimental to cutting efficiency and therefore the casing may advantageously include a groove filling portion of low density material to prevent the influx of dense material when, for example, the linear cutting charge is used underwater.
- Conveniently, the casing including the spacing portion and the groove filling portion may be integrally constructed from a low density flexible material such as expanded polyethylene.
- Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings of which
- Figure 1 is a transverse section of a flexible linear cutting charge,
- Figure 2 is an oblique view of the whole linear cutting charge of Figure 1 and
- Figure 3 is a transverse section of a flexible linear cutting= charge having stiffening means.
- The linear cutting charge of Figures 1 and 2 has an explosive bar 1 of chevron cross-section having a
groove 2 defined by theintersecting surfaces 3 and 4 which are included one to the other at an angle of 120 degrees. - The bar 1 is formed by extrusion from a pliant mixture of 88% by weight of RDX (Cyclotrimethylene- trinitramine), 8.4% PIB (Polyisobutylene), 2.4% DEHS (2(Diethylhexyl) sebacate), and 1.2% PTFE (polytetrafluroethylene).
- The thickness of the bar measured in a direction normal to either of the
faces 3 or 4 is 6.35 mm. A V-section liner 5 of 0.635mm thickness formed by extrusion from a pliant mixture of 85% by weight of 300 mesh copper powder and 5.6% PIB, 1.6% DEHS and 7.8% PTFE, is bonded to thesurfaces 3 and 4 by pressure. - A flexible casing 6 of expanded polyethylene surrounds the bar 1 except for the
groove 2 and includesspacing portions 7 and 8 which protrude beyond theedges 9 of the liner 5 by a distance of 3.8mm which, for this configuration, is the optimum stand-off distance between theedges 9 and an engagement surface 12 presented to a work surface 10. The casing 6 and the bar 1 are bonded together by a compatible adhesive. - The explosive bar 1 may conveniently be initiated by an electrically operated detonator (not shown) which may be affixed externally to the casing at one end of the linear cutting charge.
- A second embodiment of the invention is illustrated in Figure 3 in which the bar 1 and liner 5 described with reference to Figures 1 and 2 are surrounded entirely by a casing 11 of a low density material such as expanded polyethylene having an engagement surface 12 which is placed in contact with a
work surface 13. The casing 11 comprises a first portion 156 which is substantially the same as the casing 6 of Figure 1 and a groove filling portion 17 which is bonded to thefirst portion 16 atsurfaces 18 and 19 by a suitable adhesive. - Stiffening means comprising
metallic strips groove 2 and normal to the engagement surface 12, thereby limiting bending of the linear cutting charge to lateral bending parallel to the plane of the engagement surface 12. - It will be apparent to those skilled in the art that various other arrangements of the present invention are possible. For example, the casing may be of a rigid material such as polystyrene, and any casing may or may not include a groove filling portion. A groove filling portion may alternatively comprise a thin walled, air filled compartment, thereby excluding material from the groove and providing minimal resistance to the cutting slug generated by detonation of the charge.
Claims (16)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP86307745A EP0263204B1 (en) | 1986-10-08 | 1986-10-08 | A linear cutting charge |
AT86307745T ATE51958T1 (en) | 1986-10-08 | 1986-10-08 | LINEAR CUTTING CHARGE. |
ES86307745T ES2015534B3 (en) | 1986-10-08 | 1986-10-08 | LINEAR CUT LOAD |
GR90400326T GR3001010T3 (en) | 1986-10-08 | 1990-05-24 | A linear cutting charge |
GR90300049T GR900300049T1 (en) | 1986-10-08 | 1991-07-31 | A linear cutting charge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP86307745A EP0263204B1 (en) | 1986-10-08 | 1986-10-08 | A linear cutting charge |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0263204A1 EP0263204A1 (en) | 1988-04-13 |
EP0263204B1 true EP0263204B1 (en) | 1990-04-11 |
Family
ID=8196171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86307745A Expired - Lifetime EP0263204B1 (en) | 1986-10-08 | 1986-10-08 | A linear cutting charge |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0263204B1 (en) |
AT (1) | ATE51958T1 (en) |
ES (1) | ES2015534B3 (en) |
GR (2) | GR3001010T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU169487U1 (en) * | 2016-08-03 | 2017-03-21 | Станислав Иванович Дорошенко | EXTENDED EXPLOSIVE CHARGE |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2476994B (en) * | 2010-01-18 | 2015-02-11 | Jet Physics Ltd | Linear shaped charge |
CN104016818B (en) * | 2014-05-29 | 2017-04-05 | 山东大学 | A kind of multifunctional emulsified explosive cutter sweep and its method |
FR3028853B1 (en) * | 2014-11-21 | 2016-12-30 | Pyroalliance | DETONATING CUTTING ROPES AND THEIR PREPARATION |
FR3130363B1 (en) | 2021-12-15 | 2024-03-01 | Pyroalliance | Set separable by pyrotechnic cutting |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2605703A (en) * | 1944-07-06 | 1952-08-05 | Du Pont | Liner for hollow charges |
BE471713A (en) * | 1946-03-09 | |||
US3136249A (en) * | 1961-06-12 | 1964-06-09 | Jet Res Ct Inc | Shaped charge explosive unit and liner therefor |
US3185089A (en) * | 1962-06-28 | 1965-05-25 | Thiokol Chemical Corp | Flexible linear shaped charge for underwater use |
FR2333764A1 (en) * | 1975-12-05 | 1977-07-01 | Poudres & Explosifs Ste Nale | PROCESS FOR MANUFACTURING DETONATING CORDS FOR CUTTING AND IMPROVED DIEDRICAL OR HOLLOW LOADS AND DEVICES THUS OBTAINED |
-
1986
- 1986-10-08 EP EP86307745A patent/EP0263204B1/en not_active Expired - Lifetime
- 1986-10-08 ES ES86307745T patent/ES2015534B3/en not_active Expired - Lifetime
- 1986-10-08 AT AT86307745T patent/ATE51958T1/en not_active IP Right Cessation
-
1990
- 1990-05-24 GR GR90400326T patent/GR3001010T3/en unknown
-
1991
- 1991-07-31 GR GR90300049T patent/GR900300049T1/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU169487U1 (en) * | 2016-08-03 | 2017-03-21 | Станислав Иванович Дорошенко | EXTENDED EXPLOSIVE CHARGE |
Also Published As
Publication number | Publication date |
---|---|
GR3001010T3 (en) | 1991-12-30 |
GR900300049T1 (en) | 1991-07-31 |
ES2015534B3 (en) | 1990-09-01 |
ATE51958T1 (en) | 1990-04-15 |
EP0263204A1 (en) | 1988-04-13 |
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