US3924510A - Process for the production of explosive devices surrounded by a case - Google Patents

Process for the production of explosive devices surrounded by a case Download PDF

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Publication number
US3924510A
US3924510A US387039A US38703973A US3924510A US 3924510 A US3924510 A US 3924510A US 387039 A US387039 A US 387039A US 38703973 A US38703973 A US 38703973A US 3924510 A US3924510 A US 3924510A
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United States
Prior art keywords
case
explosive
explosive device
process according
placing
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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
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US387039A
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English (en)
Inventor
Manfred Strunk
Heinz Kroschel
Alfred Voss
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Dynamit Nobel AG
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Dynamit Nobel AG
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Publication of USB387039I5 publication Critical patent/USB387039I5/en
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Publication of US3924510A publication Critical patent/US3924510A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • F42B1/036—Manufacturing processes therefor

Definitions

  • the explosive device is placed in a case having an open Aug. 10, 1972 Germany 2239281 end with the other mutually pp end portion proximate to the open end.
  • a pressing tool is then 5 86/1 moved to apply a force to the other mutually opposite [58] Fie'ld R 29 32 end portion of the explosive device such that in the 86 264/1 1 1 3 f two pressing operations, a pressing tool is effective on 425/1516 the mutually opposite end portions to provide the explosive device with a uniform density.
  • references Cited also includes the press molding of a detonation inhibiting barrier within the case prior to placing the explo- UNTTED STATES PATENTS sive within the case and subsequently sealing the open 2,888,715 6/1959 Frank 264/120 X end of the case with a sealing member. 3,027,838 4/1962 Meddick 102/24 HC 3,034,393 5/1962 Lieberman et al. 102/24 HC 14 Claims, 4 Drawmg Flglll'es K I g ⁇ 1 ⁇ US. Patent Dec.
  • This invention relates to a process for the production of explosive devices surrounded by a case, wherein the explosive is molded by means of pressure with a molding tool within the case which is open on one side.
  • a conventional process tbr the manufacture of hollow explosive charges resides in casting the explosive into the case provided for this purpose which process is economical. Since an explosive which lends itself to casting has a low detonation velocity, it is possible to admix thereto up to 60% by weight of high explosive. For high-efficiency charges, special casting procedures are employed which make it possible to cast explosive charge elements having 70-80 percent by weight of high explosive. However, these special processes are unsuitable for mass production purposes. Consequently, cast hollow charge devices normally contain a relatively low proportion of high explosive. Therefore, they have a minor density and a low detonation velocity with a correspondingly poor penetration effect. Highly sophisticated casting methods, which make it possible to produce hollow explosive charges having a higher penetrating power are, however, uneconomical.
  • Pressing methods are also known for the production of hollow explosive charges having a high penetration. By means of these methods, it is possible to utilize up to 97 percent by weight of high explosive. Basically, two pressing methods are utilized:
  • the former procedure is the one employed customarily.
  • the latter procedure is employed primarily for the production of small hollow charges, for example for the manufacture of initiation charges for blast furnaces.
  • This object is attained, in accordance with this invention, by executing, prior to the pressing operation within the case, an additional preliminary pressing operation in a matrix mold, wherein the explosive is exposed to pressure from the side which, during the subsequent pressing operation within the case, is in opposition to the open side of the case, in such a manner that, in both pressing operations, the moving pressing tool is effective on mutually opposite points of the explosive device.
  • the proportion of high explosive can be -97 percent by weight. Since the manufacturing procedure takes place in an accurate tool, any asymmetry or air gaps are avoided.
  • the pressing operation takes place in two successive operating steps from different sides, so that the density of the thus-produced explosive device is extraordinarily uniform. Since the second pressing step is effected directly in the case, the explosive charge firmly contacts the case and is extremely resistant to external influences and the charge is exactly centered.
  • the process of this invention can also be employed for the production of hollow explosive charges with detonation wave control.
  • hollow explosive charges an inert body is arranged in the zone of the primer, surrounded by an annular charge. This makes it possible for the ignition to be transmitted annularlyand thus uniformly from the outside to the hollow explosive charge.
  • the barrier can be centered by means of a centering pin extended through the ignition opening of the case. This initial operating step is followed by pressing the explosive charge, already preliminarily pressed in the mold, within the case.
  • FIG. 1 shows the first pressing operation in the matrix mold during the production of a simple hollow explosive charge
  • FIG. 2 shows the second pressing operation in the case.
  • FIG. 3 shows the additional process step when manufacturing a hollow explosive charge with controlled guidance of the detonation wave
  • FIG. 4 shows the subsequent pressing of the already preliminarily pressed hollow explosive charge within the case.
  • the explosive 3 is first introduced into a matrix 2 fashioned as hollow cylinder. From below, the conically shaped lower forming die 4 of the pressing tool is inserted. After the exactly dimensioned quantity of explosive has been fed into the matrix, a pressure is exerted from above on the explosive 3 by means of the upper forming die 1 of the pressing tool. The matrix 2, as well as the lower die 4, retain their position, while only the upper die 1 is being moved. This results in the density distribution as indicated in FIG. 1, wherein the greatest explosive density occurs in the proximity of the upper die, whereas the pressure effect is increasingly reduced in the downward direction.
  • the projectile case 5 consists of a tubular sleeve closed off at its lower end face, or merely having an opening 6 for the insertion of a primer while it is completely open at its upper end face.
  • the explosive device 3' is inserted in the projectile case 5 in such a manner that the conical recess 7, produced during the first pressing step by the bottom die 4, now opens toward the top.
  • the explosive device 3 is thus inverted as compared to the first pressing step.
  • a copper funnel 8 is inserted in the conical recess 7; this funnel sealingly closes off the projectile case 5 after the projectile has been completed.
  • a somewhat wider, tubular matrix 2 is used than in the first process step, because the projectile case 5 is an additional component of the press mold.
  • the lower die 4 has a different shape in this figure. At its upper side 6, the die 4 is matched to the configuration of the lower end face of the projectile case 5 and fully supports same.
  • the conical tip of the top die 1 is pressed from above against the copper funnel 8 and thus compresses the explosive device 3'.
  • the latter is compacted primarily in the funnel zone during this operation, so that the finished charge in total has a uniformly high density.
  • firm contact is also established among the molded charge, the projectile case, and the funnel.
  • the first pressing step according to FIG. 1 is the same as described in the previous embodiment.
  • the projectile case 5" receives a prefabricated explosive device 9, together with a barrier 10.
  • a prefabricated explosive device i.e. one which has been compacted in a special pressing operation
  • the barrier 10 is centered by means of a centering pin 11 inserted from below through the ignition or primer opening of the projectile case 5".
  • the preliminarily compressed explosive device 3 and funnel 8 are inserted in the projectile case 5 and a pressing step similar to the step of FIG. 2 is carried out. That is, preliminarily compressed explosive device 3 is pressed from the funnel side by means of the movable die 1.
  • EXAMPLE 1 A hollow explosive charge produced according to the process of this invention, with a diameter of the explosive of 64 mm. and made up of a mixture of 295 g. of cyclonite as the high explosive and 15 g. of wax for stabilization, wherein the cyclonite has a grain size distribution, according to a screening analysis, of 18 percent by weight with 0.75 0.5 mm., 60 percent by weight with 0.5 0.3 mm., and 22 percent by weight with 0.3 0.15 mm., was subjected to a blasting experiment at a distance of mm. from a homogenous steel block having a minimum tensile strength of 60 kp./mm and resulted in an average penetration depth of 410 mm.
  • the charges produced in accordance with the pressing method of this invention exhibit a high and uniform density which is not impaired even by outside invluences. This was L to be true by subjecting nine test charges to a destructive test to determine the density of the explosive; three of these charges were tested immediately after manufacturing, i.e. without being exposed to environmental influences, three were tested after a storage time of 7 days at 63 C., two after a storage time of 7 days at 40 C., and one charge was tested after being stressed by vibration and shock forces. The density was found to be 1.700 g./cm This value is very high and, in spite of high initial stressing of the test specimens, shows a relatively low range of variation resulting in uniform penetration effect.
  • EXAMPLE 2 The density of such a hollow charge can be further improved to a minor extent by a specific grain size selection for the explosive.
  • screened explosive having a maximum granular size of 0.37 mm. yielded, with the same charge structure and likewise 295 g. of cyclonite and 15 g. of wax, a penetration effect of, on the average 414 mm., demonstrating a small increase in the penetration effect.
  • Process for the production of explosive devices surrounded by a case comprising the steps of placing an explosive charge in a matrix mold, moving a pressing tool in a first direction within the mold to apply a force to the explosive charge to compress the charge and form an explosive device of a predetermined shape with mutually opposite end portions, the pressing tool during the movement thereof applying the force to one of the mutually opposite end portions, placing the explosive device within a case having an open end such that the other mutually opposite end portion of the explosive device is arranged proximate thereto, and moving a pressing tool to apply a force to the other mutually opposite end portion of the explosive body within the case such that in the two pressing operations, a pressing tool is effective on the mutually opposite end portions of the explosive device to provide the explosive device with a uniform density.
  • the matrix mold is a tubular mold having one end portion closed by a conical member extending into the mold, and moving the pressing tool through the open end portion of the mold in the direction of the closed end portion.
  • a process according to'claim 5 wherein the pressing tool has a flat end face and moving the flat end face into contact with the one mutually opposite end portion of the explosive device to provide the one mutually opposite end portion of the explosive device with a substantially flat end surface, the other mutually opposite end portion being provided with an end surface conforming to the conical member extending into the mold.
  • a process according to claim 8 further comprising prior to placing the explosive device in the case, press molding a detonation inhibiting barrier surrounded by an annular charge within the case.
  • the case has an iginition openingin the end opposite the open end thereof and further comprising the step of extending a centering pin through the ignition opening of the case and centering the inhibiting barrier with the centering pin.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Press Drives And Press Lines (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
US387039A 1972-08-10 1973-08-09 Process for the production of explosive devices surrounded by a case Expired - Lifetime US3924510A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2239281A DE2239281C3 (de) 1972-08-10 1972-08-10 Verfahren zur Herstellung von mit einer Hülle umgebenen Sprengstoffkörpern

Publications (2)

Publication Number Publication Date
USB387039I5 USB387039I5 (enrdf_load_stackoverflow) 1975-01-28
US3924510A true US3924510A (en) 1975-12-09

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Country Status (6)

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US (1) US3924510A (enrdf_load_stackoverflow)
BE (1) BE803470A (enrdf_load_stackoverflow)
DE (1) DE2239281C3 (enrdf_load_stackoverflow)
FR (1) FR2367033A1 (enrdf_load_stackoverflow)
GB (1) GB1421503A (enrdf_load_stackoverflow)
IT (1) IT996104B (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4250792A (en) * 1978-03-20 1981-02-17 Dynamit Nobel Aktiengesellschaft Process for the production of compacted explosive charges
US4450124A (en) * 1978-12-04 1984-05-22 Dynamit Nobel Aktiengesellschaft Production of compacted, large-caliber explosive charges
US4455914A (en) * 1978-12-04 1984-06-26 Dynamit Nobel Aktiengesellschaft Process for the production of compacted explosive devices for ammunition or explosive charges, especially those of a large caliber
US4616566A (en) * 1984-10-05 1986-10-14 Halliburton Company Secondary high explosive booster, and method of making and method of using same
US4651618A (en) * 1984-04-25 1987-03-24 Diehl Gmbh & Co. Process for the introduction of a charge into a projectile casing
US4674391A (en) * 1984-08-02 1987-06-23 Messerschmitt-Bolkow-Blohm Gmbh Device for supporting warhead case during a charge pressing step
EP1345003A3 (en) * 2002-03-12 2004-05-12 Halliburton Energy Services, Inc. Shaped charge liner with precursor liner
US20110209871A1 (en) * 2009-07-01 2011-09-01 Halliburton Energy Services, Inc. Perforating Gun Assembly and Method for Controlling Wellbore Pressure Regimes During Perforating
US20110219978A1 (en) * 2010-03-09 2011-09-15 Halliburton Energy Services, Inc. Shaped Charge Liner Comprised of Reactive Materials
US20110232466A1 (en) * 2010-03-23 2011-09-29 Bruce Van Stratum Modular hand grenade
US20120027883A1 (en) * 2010-06-17 2012-02-02 Halliburton Energy Services, Inc. High Density Powdered Material Liner
US8734960B1 (en) 2010-06-17 2014-05-27 Halliburton Energy Services, Inc. High density powdered material liner
US9546856B1 (en) * 2014-09-22 2017-01-17 The United States Of America As Represented By The Secretary Of The Army Press load process for warhead
WO2020027736A1 (en) * 2018-07-31 2020-02-06 Orica International Pte Ltd Explosive device configured for producing a quasi-planar shock wave
US11209255B1 (en) 2019-09-10 2021-12-28 The United States Of America As Represented By The Secretary Of The Army Press load process for warheads
US20220074719A1 (en) * 2020-03-03 2022-03-10 Geodynamics, Inc. Asymmetric initiated shaped charge and method for making a slot-like perforation

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3323991A1 (de) * 1983-07-02 1989-06-08 Juergen Wisotzki Trichter- oder schalenfoermige einlage fuer hohlladungen sowie verfahren und form zu deren herstellung
DE3335821A1 (de) * 1983-10-01 1985-04-11 Rheinmetall GmbH, 4000 Düsseldorf Treibladung und verfahren zu ihrer herstellung
GB8509061D0 (en) * 1985-04-09 1985-05-15 British Res Agricult Eng Briquetting fibrous crop &c material
RU2209804C2 (ru) * 2001-05-28 2003-08-10 Федеральное государственное унитарное предприятие "Научно-исследовательский институт полимерных материалов" Устройство для нанесения бронирующего покрытия

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE852217C (de) * 1944-03-16 1952-10-13 Laeis Werke Ag Stehende hydraulische Formsteinpresse
US2888715A (en) * 1957-03-21 1959-06-02 Stokes F J Corp Proportional pressing
US3027838A (en) * 1956-06-27 1962-04-03 Borg Warner Shaped charge
US3034393A (en) * 1959-06-01 1962-05-15 Aerojet General Co Method for producing a shaped charge
US3255659A (en) * 1961-12-13 1966-06-14 Dresser Ind Method of manufacturing shaped charge explosive with powdered metal liner
US3736875A (en) * 1969-09-23 1973-06-05 Dynamit Nobel Ag Explosive charge with annular ignition gap

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE715247C (de) * 1939-10-05 1941-12-17 Westfaelisch Anhaltische Spren Verfahren und Vorrichtung zur Herstellung von Sprengladungen, Zuendladungen o. dgl.
DE730343C (de) * 1939-11-22 1943-01-11 Westfaelisch Anhaltische Spren Vorrichtung und Verfahren zur Herstellung von Spreng- oder Zuendladungen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE852217C (de) * 1944-03-16 1952-10-13 Laeis Werke Ag Stehende hydraulische Formsteinpresse
US3027838A (en) * 1956-06-27 1962-04-03 Borg Warner Shaped charge
US2888715A (en) * 1957-03-21 1959-06-02 Stokes F J Corp Proportional pressing
US3034393A (en) * 1959-06-01 1962-05-15 Aerojet General Co Method for producing a shaped charge
US3255659A (en) * 1961-12-13 1966-06-14 Dresser Ind Method of manufacturing shaped charge explosive with powdered metal liner
US3736875A (en) * 1969-09-23 1973-06-05 Dynamit Nobel Ag Explosive charge with annular ignition gap

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4250792A (en) * 1978-03-20 1981-02-17 Dynamit Nobel Aktiengesellschaft Process for the production of compacted explosive charges
US4450124A (en) * 1978-12-04 1984-05-22 Dynamit Nobel Aktiengesellschaft Production of compacted, large-caliber explosive charges
US4455914A (en) * 1978-12-04 1984-06-26 Dynamit Nobel Aktiengesellschaft Process for the production of compacted explosive devices for ammunition or explosive charges, especially those of a large caliber
US4651618A (en) * 1984-04-25 1987-03-24 Diehl Gmbh & Co. Process for the introduction of a charge into a projectile casing
US4674391A (en) * 1984-08-02 1987-06-23 Messerschmitt-Bolkow-Blohm Gmbh Device for supporting warhead case during a charge pressing step
US4616566A (en) * 1984-10-05 1986-10-14 Halliburton Company Secondary high explosive booster, and method of making and method of using same
EP1345003A3 (en) * 2002-03-12 2004-05-12 Halliburton Energy Services, Inc. Shaped charge liner with precursor liner
US20110209871A1 (en) * 2009-07-01 2011-09-01 Halliburton Energy Services, Inc. Perforating Gun Assembly and Method for Controlling Wellbore Pressure Regimes During Perforating
US8807003B2 (en) 2009-07-01 2014-08-19 Halliburton Energy Services, Inc. Perforating gun assembly and method for controlling wellbore pressure regimes during perforating
US8739673B2 (en) 2009-07-01 2014-06-03 Halliburton Energy Services, Inc. Perforating gun assembly and method for controlling wellbore pressure regimes during perforating
US8555764B2 (en) 2009-07-01 2013-10-15 Halliburton Energy Services, Inc. Perforating gun assembly and method for controlling wellbore pressure regimes during perforating
US8381652B2 (en) 2010-03-09 2013-02-26 Halliburton Energy Services, Inc. Shaped charge liner comprised of reactive materials
US9617194B2 (en) 2010-03-09 2017-04-11 Halliburton Energy Services, Inc. Shaped charge liner comprised of reactive materials
US20110219978A1 (en) * 2010-03-09 2011-09-15 Halliburton Energy Services, Inc. Shaped Charge Liner Comprised of Reactive Materials
US8794153B2 (en) 2010-03-09 2014-08-05 Halliburton Energy Services, Inc. Shaped charge liner comprised of reactive materials
US20110232466A1 (en) * 2010-03-23 2011-09-29 Bruce Van Stratum Modular hand grenade
US8136437B2 (en) * 2010-03-23 2012-03-20 Martin Electronics, Inc. Modular hand grenade
US8734960B1 (en) 2010-06-17 2014-05-27 Halliburton Energy Services, Inc. High density powdered material liner
US8741191B2 (en) 2010-06-17 2014-06-03 Halliburton Energy Services, Inc. High density powdered material liner
US20120027883A1 (en) * 2010-06-17 2012-02-02 Halliburton Energy Services, Inc. High Density Powdered Material Liner
US8449798B2 (en) * 2010-06-17 2013-05-28 Halliburton Energy Services, Inc. High density powdered material liner
US9546856B1 (en) * 2014-09-22 2017-01-17 The United States Of America As Represented By The Secretary Of The Army Press load process for warhead
WO2020027736A1 (en) * 2018-07-31 2020-02-06 Orica International Pte Ltd Explosive device configured for producing a quasi-planar shock wave
US12104887B2 (en) 2018-07-31 2024-10-01 Orica International Pte Ltd Explosive device configured for producing a quasi-planar shock wave
US11209255B1 (en) 2019-09-10 2021-12-28 The United States Of America As Represented By The Secretary Of The Army Press load process for warheads
US20220074719A1 (en) * 2020-03-03 2022-03-10 Geodynamics, Inc. Asymmetric initiated shaped charge and method for making a slot-like perforation

Also Published As

Publication number Publication date
DE2239281B2 (de) 1980-08-14
BE803470A (fr) 1973-12-03
DE2239281A1 (de) 1974-02-21
GB1421503A (en) 1976-01-21
DE2239281C3 (de) 1984-05-30
FR2367033A1 (fr) 1978-05-05
USB387039I5 (enrdf_load_stackoverflow) 1975-01-28
FR2367033B1 (enrdf_load_stackoverflow) 1979-03-02
IT996104B (it) 1975-12-10

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