DK164377B

DK164377B - EXPLOSIVE LOADING FOR LINEAR CUTTING FORM

Info

Publication number: DK164377B
Application number: DK559286A
Authority: DK
Inventors: David Alan Dadley; Peter John Haskins
Original assignee: Royal Ordnance Plc
Priority date: 1986-11-21
Filing date: 1986-11-21
Publication date: 1992-06-15
Also published as: DK559286A; DK559286D0; DK164377C

Description

DK 164377 BDK 164377 B

Opfindelsen vedrører en lineær ladning omfattende en eksplosiv masse i form af en stang, som langs en af sine flader har en langsgående fordybning, hvori der er anbragt en foring.The invention relates to a linear charge comprising an explosive mass in the form of a rod having along one of its faces a longitudinal depression in which a liner is arranged.

5 Der kendes hule ladninger omfattende en eks plosiv masse, der i den ene flade har en hensigtsmæssigt udformet hulhed, der er foret med en metalforing. Detonering af ladningen komprimerer metalforingen kraftigt og omdanner den til et udadrettet TO metalprojektil, hvis form afhænger af hulhedens form.Hollow charges are known comprising an explosive mass having in one face an appropriately formed hollow lined with a metal liner. Detonating the charge greatly compresses the metal liner and transforms it into an outward TO metal projectile, the shape of which depends on the shape of the cavity.

Dette såkaldte projektil har effektive gennemtrængningsegenskaber, der udnyttes ved at detonere ladningen med hulheden vendende imod og i anlæg mod en flade, der skal gennemtrænges, dvs. arbejdsfladen.This so-called projectile has effective penetration properties which are utilized by detonating the charge with the cavity facing and in contact with a surface to be penetrated, ie. work surface.

T5 Projektilets gennemtrængning afhænger af ladningens afstand fra arbejdsfladen, den såkaldte frigangsdistance, hvis optimale størrelse normalt fastlægges ved eksperimenter.T5 The penetration of the projectile depends on the distance of the charge from the work surface, the so-called clearance distance, the optimal size of which is usually determined by experiments.

Et kendt eksempel på en hul ladning til line-20 ære skæreformål omfatter en langagtig masse af eksplosivt materiale, der har en langsgående hulhed i form af en V-formet fordybning, og hvor den eksplosive masse er indkapslet i et tyndvægget metalhylster.A known example of a hollow charge for line-20 cutting purposes comprises a longitudinal mass of explosive material having a longitudinal cavity in the form of a V-shaped recess, wherein the explosive mass is encapsulated in a thin-walled metal casing.

Detcr.ering af ladningen frembringer et plant projek-25 til, der forløber i fordybningens længderetning, og som kan udnyttes til lineær skæring. Ved en kendt fremgangsmåde til fremstilling af sådanne lineære skæreladninger fyldes et blyrør med eksplosivt granulat, hvorefter det ledes gennem en række valsear-30 rangementer, der giver det fyldte rør et vinkelformet tværsnit med den blyforede V-formede fordybning forløbende i stangens længderetning. Det er alene tykkelsen af de blyvægge, der omgiver de to ydre spidser af den V-formede fordybning, der bestemmer lad-35 ningens afstand fra arbejdsfladen og dermed fri-gangsdistancen. Sådan fremstillede lineære skæreladninger har ofte uensartede vægtykkelse, og i til- 2Detection of the charge produces a flat project-25 which extends in the longitudinal direction of the depression and which can be utilized for linear cutting. In a known method for producing such linear cutting charges, an explosive granular lead tube is filled and then passed through a series of roller arrangements giving the filled tube an angular cross-section with the lead-lined V-shaped recess extending longitudinally of the rod. It is only the thickness of the lead walls that surround the two outer tips of the V-shaped recess that determines the charge distance from the work surface and thus the clearance distance. Such linear cutting charges are often of uniform wall thickness, and in addition 2

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fælde af at disse uregelmæssigheder optræder i fri-gangsområdet eller i fordybningens foring, kan der opstå variationer, hvad angår skæreeffektiviteten med deraf følgende uensartede skæreresultater.In the event of these irregularities occurring in the free-range area or in the recess lining, variations in cutting efficiency may occur with the resulting uneven cutting results.

5 løvrigt kendes der fra US-A-3 185 089 en lineær ladning, hvor ladningens foring består af mange separate metalliske elementer for at tillade, at ladningen kan bøjes i alle retninger. Dette fører også til variationer i skæreeffektiviteten og til manglende ensartet-10 hed i skæreeffekten.5, a linear charge is known from US-A-3 185 089 in which the charge of the charge consists of many separate metallic elements to allow the charge to be bent in all directions. This also leads to variations in the cutting efficiency and to a lack of uniformity in the cutting effect.

Opfindelsen tager sigte på at anvise en lineær skæreladning, hvis konstruktion bidrager til en nøjagtig og ensartet dannelse af dens effektive dimensioner.The invention aims to provide a linear cutting charge whose construction contributes to accurate and uniform formation of its effective dimensions.

15 Den lineære skæreladning ifølge opfindelsen er ejendommelig ved, at den eksplosive masse er dannet af en blanding af et eksplosivt materiale og et første ef-tergiveligt materiale, at foringen er dannet af en blanding af et metal på partikelform og et andet eftergive-20 ligt materiale, og at foringen er sammenhængende.The linear cutting charge according to the invention is characterized in that the explosive mass is formed of a mixture of an explosive material and a first yieldable material, that the liner is formed of a mixture of a metal in particulate form and a second yieldable material. material and that the lining is coherent.

Både stangen og foringen er med fordel fremstillet ved ekstrusion, men kan også være dannet ved andre teknikker, f.eks. støbning eller valsning.Both the rod and the liner are advantageously made by extrusion, but may also be formed by other techniques, e.g. casting or rolling.

Metallet på partikelform er med fordel kob- 25 ber.The metal in particulate form is advantageously coupled.

Det første og det andet eftergivelige materiale vælges, så de er kemisk kompatible med det eksplosive materiale og vælges med fordel ens.The first and second resilient materials are selected so that they are chemically compatible with the explosive material and advantageously selected equally.

Fordybningen har med fordel et udefter åbnende 30 trekantet tværsnit, og både stangen og foringen kan have et vinkelformet tværsnit, idet foringen er fæstnet til stangen,, så den dækker fordybningens overflader.Advantageously, the recess has an outwardly opening triangular cross-section, and both the bar and liner may have an angular cross-section, the liner being attached to the bar, so as to cover the recesses' surfaces.

Det er ligeledes en fordel, hvis den lineære 35 skæreladning yderligere omfatter et hus, der er så stift, at det forhindrer- vridning af stangen og fo- 3It is also advantageous if the linear cutting charge further comprises a housing so rigid as to prevent twisting of the rod and foil.

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ringen under håndtering, hvilket hus med fordel omfatter en afstandssektion med en indgrebsflade, der er indrettet til at vende mod arbejdsfladen, og hvilken indgrebsflade forløber parallelt med foringens 5 ydersider og en vis afstand derfra med henblik på at opretholde en optimal frigangsdistance. Alternativt kan huset være fleksibelt, så skæring af krumme flader og krumme linier lettes.the ring during handling, which housing advantageously comprises a spacer section with an engaging surface arranged to face the work surface, and which engaging surface extends parallel to the outer sides of the casing and some distance therefrom in order to maintain an optimum clearance distance. Alternatively, the housing may be flexible to facilitate cutting of curved surfaces and curved lines.

Når den fleksible ladning skal anvendes til 10 skæring af krumme linier på en plan flade, kan den med fordel omfatte afstivningsorganer, der kan bestå af metalliske strimler, der er indstøbt i huset vinkelret på indgrebsfladen og forløber i længderetningen på begge sider af fordybningen, således at bøj-15 ning af den lineære skæreladning kun kan finde sted i et lateral retning parallelt med indgrebsfladen.When the flexible charge is to be used for cutting curved lines on a flat surface, it may advantageously comprise stiffening means which may consist of metallic strips embedded in the housing perpendicular to the engaging surface and extending longitudinally on both sides of the depression. bending of the linear cutting charge can only take place in a lateral direction parallel to the engaging surface.

Tilstedeværelsen af tungere materiale i fordybningen er skadeligt for skæreeffektiviteten, og huset kan derfor med fordel omfatte en udfyldnings-20 del af let materiale, der er indrettet til at anbringes i fordybningen og forhindre indstrømning af tungere materiale, eksempelvis når den lineære skæreladning anvendes under vand.The presence of heavier material in the recess is detrimental to the cutting efficiency, and therefore the housing may advantageously comprise a filler portion of light material adapted to be placed in the recess and prevent inflow of heavier material, for example when the linear cutting charge is used underwater. .

Huset, incl. afstandssektionen og udfyldnings-25 delen til fordybningen kan passende udføres ud i et af et let,fleksibelt materiale, såsom ekspanderet polyethylen.The house, incl. The spacer section and the fill portion for the recess may conveniently be made out of one of a light, flexible material such as expanded polyethylene.

I det følgende forklares opfindelsen nærmere under henvisning til tegningen, hvor 30 fig. 1 viser et tværsnit gennem en fleksibel lineær skæreladning fig. 2 et perspektivbillede af den lineære skæreladning i fig. 1, og fig. 3 et tværsnit gennem en fleksibel lineær 35 skæreladning med afstivningsorganer.The invention will now be explained in more detail with reference to the drawing, in which 1 shows a cross section through a flexible linear cutting charge FIG. 2 is a perspective view of the linear cutting charge of FIG. 1, and FIG. 3 is a cross-section through a flexible linear cutting insert with stiffening means.

Den i figurerne 1 og 2 viste lineære skæreladning har en eksplosiv stang 1 med vinkelformet 4The linear cutting charge shown in Figures 1 and 2 has an explosive rod 1 with angular 4

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tværsnit og med en fordybning 2, der af grænses af flader 3 og 4 med en indbyrdes vinkel på 120°.cross-section and with a depression 2 bounded by faces 3 and 4 at an angle of 120 °.

Stangen 1 er fremstillet ved ekstrusion af en eftergivelig eller blød blanding af 88-vægt% af 5 RDX (c’yclotrimethylen trinitramin) , 8,4% PIB (poly-isobutylen); 2,4% DEHS (2 (diethylhexyl) sebacat), og 1,2% PTFE (polytetrafluroethylen).Bar 1 is prepared by extrusion of a resilient or soft mixture of 88% by weight of 5 RDX (cyclo-trimethylene trinitramine), 8.4% PIB (polyisobutylene); 2.4% DEHS (2 (diethylhexyl) sebacate), and 1.2% PTFE (polytetrafluoroethylene).

Stangens tykkelse målt i en retning vinkelret på enten fladen 3 eller fladen 4 er 6,35 mm.The thickness of the bar measured in a direction perpendicular to either the surface 3 or the surface 4 is 6.35 mm.

10 En V-formet foring 5 med en tykkelse på 0,635 mm er fremstillet ved ekstrusion af en eftergivelig eller blød blanding af 85-vægt% kobberpulver med en finhed på 300 mesh og 5,6% PIB, 1,6% DEHS og 7,8% PTFE og fæstnet til fladerne 3 og 4 ved tryk.A V-shaped liner 5 with a thickness of 0.635 mm is made by extrusion of a resilient or soft blend of 85% by weight copper powder with a fineness of 300 mesh and 5.6% PIB, 1.6% DEHS and 7, 8% PTFE and attached to surfaces 3 and 4 by pressure.

15 Stangen 1 er bortset fra den side, der har fordybningen 2, omgivet af et fleksibelt hus 6, der er fremstillet af ekspanderet polyethylen, og omfatter afstandssektioner 7 og 8, der i den viste udføreIsesform rager 3,8 mm frem forbi foringen 20 5's kanter 9, idet denne afstand i dette tilfælde repræsenterer den optimale frigangsdistance mellem kanterne 9 og den indgrebsflade 12, der ligger an mod arbejdsfladen 10. Huset 6 og stangen 1 er fastgjort til hinanden ved hjælp af et kompati-25 belt klæbemiddel.The bar 1, apart from the side having the recess 2, is surrounded by a flexible housing 6 made of expanded polyethylene and comprises spacer sections 7 and 8 which, in the embodiment shown, extend 3.8 mm past the liner 20 5. edges 9, this distance representing in this case the optimum clearance distance between the edges 9 and the engaging surface 12 abutting the working surface 10. The housing 6 and the rod 1 are fixed to each other by means of a compatible adhesive.

Den eksplosive stang 1 kan passende detoneres ved hjælp af en elektrisk betjent, ikke vist detonator, der kan være fastgjort udvendigt på huset ved den ene ende af den lineære skæreladning.Suitably, the explosive rod 1 can be detonated by means of an electrically operated, not shown detonator, which may be secured externally to the housing at one end of the linear cutting charge.

30 I fig. 3 er vist en anden udførelsesform for opfindelsen, hvor stangen 1 og foringen 5, der blev beskrevet under henvisning til figurerne 1 og 2, er omgivet fuldstændigt af et hus 11 af et letvægtsmateriale , såsom ekspanderet polyethylen og med 35 en indgrebsflade 12 anbragt i kontakt mod arbejds-fladen 13. Huset 11 omfatter et første parti 16, der stort set svarer til huset 6 i fig. 1, og en udfyldningsdel 17, der er anbragt i fordybningenIn FIG. 3, another embodiment of the invention is shown in which the rod 1 and the liner 5 described with reference to Figures 1 and 2 are completely surrounded by a housing 11 of a lightweight material such as expanded polyethylene and contacted with a contact surface 12. towards the work surface 13. The housing 11 comprises a first portion 16 which corresponds substantially to the housing 6 in FIG. 1, and a filling portion 17 disposed in the recess

Claims

20 PATENT REQUIREMENTS

A linear charge comprising an explosive mass in the form of a rod (1) having along one of its faces a longitudinal depression (2) in which a liner is arranged, characterized in that the explosive mass is formed by a mixing of an explosive material and a first resilient material, that the liner (5) is formed of a mixture of a metal in particulate form and a second resilient material and that the liner is coherent.

The cutting charge according to claim 1, characterized in that the metal in particle form is copper.

Cutting charge according to claims 1 and 2, characterized in that the first and second sensitive material are the same. DK 164377 B

The cutting charge according to claim 3, characterized in that the resilient materials consist of PIB (polysiobutylene), DEHS (2 (diethylhexyl) sebacate), and PTFE (polytetrafluoroethylene).

Cutting charge according to any one of the preceding claims, characterized in that both the rod (1) and the liner (5) are extrusion-shaped.

Cutting charge according to any one of the preceding claims, characterized in that it further comprises a housing (6) which is open at the recess and has a contact surface (12) arranged to abut against a working surface.

Cutting charge according to claim 6, characterized in that the housing (6) extends past the recess (2) to form a clearance portion (7, 8) by which the abutment surface is caused to take a predetermined amount. clearance distance from the outer edges of the casing.

Cutting charge according to claims 6 and 7, characterized in that the housing (11) comprises a part (17) of a light material, which part fills the recess.

Cutting charge according to claim 8, characterized in that the filling part (17) and the housing 25 (11) are made in one.

Cutting charge according to any one of the preceding claims, characterized in that the recess (2) has an outwardly opening triangular cross-section.

Cutting charge according to claim 10, characterized in that the rod (1) and the liner (5) have an angular cross-section.

Cutting charge according to any one of claims 6-10, characterized in that the housing is substantially rigid.

Cutting charge according to any one of claims 6-11, characterized in that the housing is substantially flexible. UK 1t> <h5 // D

Cutting charge according to claim 13, characterized in that it comprises stiffening means (14, 15) which causes the bending of the rod to be substantially reduced to bending in the lateral direction 5 parallel to the abutment surface.

Cutting charge according to claim 14, characterized in that the stiffening means comprise metal strips (14, 15) embedded in the housing (11) perpendicular to the abutment surface and extending longitudinally on both sides of the recess (2).

Cutting charge according to claims 13-15, characterized in that the housing is made of expanded polyethylene.