EP0153687A2 - Dispositif pour la fabrication de poudre de charge propulsive sous forme de boudin - Google Patents

Dispositif pour la fabrication de poudre de charge propulsive sous forme de boudin Download PDF

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Publication number
EP0153687A2
EP0153687A2 EP85101798A EP85101798A EP0153687A2 EP 0153687 A2 EP0153687 A2 EP 0153687A2 EP 85101798 A EP85101798 A EP 85101798A EP 85101798 A EP85101798 A EP 85101798A EP 0153687 A2 EP0153687 A2 EP 0153687A2
Authority
EP
European Patent Office
Prior art keywords
fluid
needles
channels
perforated plate
strand
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.)
Withdrawn
Application number
EP85101798A
Other languages
German (de)
English (en)
Other versions
EP0153687A3 (fr
Inventor
Dietmar Dipl.-Chem. Dr. Müller
Harald Franken
Rudolf Kröhnert
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP0153687A2 publication Critical patent/EP0153687A2/fr
Publication of EP0153687A3 publication Critical patent/EP0153687A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/221—Extrusion presses; Dies therefor extrusion dies
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/0075—Shaping the mixture by extrusion

Definitions

  • the invention relates to a device for producing propellant charge powder in the form of a strand with axially parallel channels in a press with at least one molding die which has a plurality of needles arranged in parallel in its area forming the strand for molding the channels.
  • twin-shaft screw textluder are used as co-rotating or counter-rotating devices (DE-OS 30 44 577), which have screw-shaped feeder segments in an alternating arrangement and calming zones in a defined arrangement.
  • a molding head with a reduced inner diameter which forms the plasticized propellant powder into a strand.
  • Needles are also arranged on the molding head, which protrude into the bore of the shaping part and form the channels in the strand.
  • the invention has for its object to provide a device with which - continuously or discontinuously - amaschineladun g sstrang with a defined and reproducible geometry of the channels can be made.
  • the needles are designed as open hollow needles and are subjected to a fluid with a slight excess pressure.
  • the open hollow needles are constantly flowed through by the fluid, which is under slight excess pressure.
  • the fluid penetrates at the open ends of the hollow needles into the channels formed on the outside of them, so that these too are under a slight excess pressure.
  • Known devices in the form of an extruder have a molding head with a perforated plate that closes off the extruder chamber on the outlet side with a plurality of passage holes arranged symmetrically on a circle, and a centrally arranged needle holder, the needles of which protrude into a molded part located downstream with an inner diameter that is reduced compared to the arrangement circle of the holes.
  • the plasticized propellant powder is thus first pressed through the holes in the pinhole by means of the extruder shafts.
  • the resulting individual strands of smaller diameter are then combined in the molded part with the reduced inner diameter to form a larger strand.
  • the needle holder and the perforated diaphragm have at least one radially extending channel for supplying the fluid to the hollow needles.
  • the perforated plate a respective fluid channel disposed between adjacent holes, so that the fluid ohlnadeln the H symmetrically flows and different flow resistances, and the flow paths are avoided or vice versa ensures that the fluid flows out on each hollow needle at the same speed and pressure.
  • the needle holder is interchangeably mounted in a receptacle of the perforated plate, so that the number and arrangement of the channels can be selected by exchanging the needle holder with the same fluid feed in each case.
  • the invention further provides for minimizing the interfacial forces between the molded part and the strand.
  • the molded part consists of brass, stainless steel or a steel with a high TiC content in spherulitic form.
  • Such a molded part can be produced, for example, by electrical discharge machining, so that surface unevenness is avoided by mechanical processing.
  • the above-mentioned materials have a surface with very low roughness or a spherical roughness in the micro range. Instead, plastic inserts, e.g. B. PTFE, possible.
  • Both air and an inert gas can be used as the fluid, which is under a pressure of approximately 1.5 bar, for example.
  • the extruder shown in Figure 1 has a housing 1, which is composed of several segments 2, which are clamped together by end flanges 3.
  • a housing 1 On the drive side 4, two parallel, counter-rotating or counter-rotating worm shafts 5 are inserted into the housing, which extend to the front end flange 3 and end there in tips.
  • a molding head 17 connects to the last housing segment 2.
  • Such a screw extruder can be used, for example, to produce propellant powder with one or more bases, as described in the earlier patent application P 32 42 301, so that only the essential parts of the extruder are dealt with here.
  • the first housing segment 2 on the drive side is provided with an addition opening 6 for the solid components, namely nitrocellulose (NC) and additives.
  • the next segment 2 following downstream is equipped with a nozzle channel 7 through which a solvent is metered in.
  • the penultimate housing segment 2 in the conveying direction has a cutout 8, which serves on the one hand for degassing the plasticized product and on the other hand for photo-optical recording of the surface of the plasticized product at this point.
  • a camera 9 is provided which is directed into the opening 8 and is connected to a monitor 10. over the photo-optical recording, the solvent is dosed via channel 7.
  • DE-OS 30 44 577 for this, reference is made to DE-OS 30 44 577.
  • the two symmetrically constructed worm shafts 5 initially have a conveyor segment 11 on the drive side, which is of a single-start design. This is followed in the area of the nozzle channel 7 by a further multi-start conveyor segment 12, which in turn is followed by a first kneading segment 13 and a second kneading segment 14.
  • a baffle plate 15 adjoins the last kneading segment, which in turn is followed by a multi-start conveyor segment 12.
  • further kneading segments 13 are placed on the exit end of the shaft.
  • calming zones 16 are provided, in which there are no displacement bodies on the shafts.
  • the individual housing segments, as well as the "molding head 17, are provided with heating or cooling devices 18 in order to be able to control the temperature of the plasticized product differently in the individual kneading and conveying areas.
  • the molding head 17 is seated in a housing segment 19 (FIGS. 2 and 3), which connects to the last housing segment 2 of the extruder.
  • a perforated plate 20 with a plurality of axially parallel holes 21, which are spaced from the axis in a circle are arranged.
  • the plasticized propellant powder is pressed through these holes.
  • a molded part 22 with a reduced inner diameter adjoins the perforated plate 20, which gives the strand the final shape and the final outer diameter.
  • a plurality of needles 23 extend, which follow a precisely defined one Geometry are arranged.
  • the needles 23 are seated on a needle holder 24 which is axially exchangeably inserted in the perforated diaphragm 20 and are designed as hollow needles which are open on both sides.
  • Radial channels 25 in the perforated plate 20 open into the needle holder 24. These radial channels 25 each run between the holes 21 of the perforated plate 20 and are connected to an annular channel 26 on the outer circumference of the perforated plate.
  • the annular channel 26 is supplied with a fluid, preferably air or inert gas, under a weak excess pressure via two axially parallel bores 27. The fluid flows from the annular channel via the radial channels 25 in the perforated plate 20 into the needle holder 24 and from there through the hollow needles 23 into the channels of the extruded propellant charge.
  • the needles are designed as hollow needles, to which the fluid is supplied via corresponding channels in the bottom of the press pot.
EP85101798A 1984-02-28 1985-02-19 Dispositif pour la fabrication de poudre de charge propulsive sous forme de boudin Withdrawn EP0153687A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3407238 1984-02-28
DE19843407238 DE3407238A1 (de) 1984-02-28 1984-02-28 Vorrichtung zum herstellen von treibladungspulver in strangform

Publications (2)

Publication Number Publication Date
EP0153687A2 true EP0153687A2 (fr) 1985-09-04
EP0153687A3 EP0153687A3 (fr) 1987-01-07

Family

ID=6229072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101798A Withdrawn EP0153687A3 (fr) 1984-02-28 1985-02-19 Dispositif pour la fabrication de poudre de charge propulsive sous forme de boudin

Country Status (3)

Country Link
US (1) US4622000A (fr)
EP (1) EP0153687A3 (fr)
DE (1) DE3407238A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0232156A2 (fr) * 1986-02-06 1987-08-12 Cadbury Limited Matrice d'extrusion

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4792423A (en) * 1987-07-13 1988-12-20 United Technologies Corporation Method for making solid rocket propellant
US5251531A (en) * 1989-04-25 1993-10-12 Wnc-Nitrochemie Gmbh Method and apparatus to prepare monobasic propellant charge powders with alcohol and ether as solvents
DE3913603C1 (fr) * 1989-04-25 1990-03-29 Wnc-Nitrochemie Gmbh, 8261 Aschau, De
JPH05193975A (ja) * 1991-08-29 1993-08-03 Furukawa Electric Co Ltd:The 押出し成形式多孔質光ファイバ母材製造装置
US5483862A (en) * 1994-11-22 1996-01-16 The United States Of America As Represented By The Secretary Of The Army Apparatus and method for homogenizing plastic explosives

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191027700A (en) * 1910-11-28 1911-05-25 Messrs Curtis S & Harvey Ltd Improvements in the Manufacture of Tubes from Plastic Materials.
GB916534A (en) * 1961-05-17 1963-01-23 Richard Sizer Ltd Improvements in and relating to cube and pellet extrusion of feedstuffs
US3402682A (en) * 1966-10-04 1968-09-24 Gen Mills Inc Die-head for producing hollow particles
FR1577201A (fr) * 1957-10-19 1969-08-08
FR2169160A1 (fr) * 1972-01-24 1973-09-07 Gillette Co
DE2605481A1 (de) * 1975-02-15 1976-08-26 Icoa Verfahren und vorrichtung zur herstellung polykapillarer elemente
EP0052797A1 (fr) * 1980-11-26 1982-06-02 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Procédé et dispositif pour la fabrication en continu de poudre de charge propulsive
US4413968A (en) * 1982-03-11 1983-11-08 Thiokol Corporation Extrusion die metering device
DE3242301A1 (de) * 1982-11-16 1984-05-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren und vorrichtung zur herstellung ein- oder mehrbasiger treibladungspulver

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US321374A (en) * 1885-06-30 Dleditch
US2320243A (en) * 1940-03-27 1943-05-25 Du Pont Smokeless powder composition
US2342204A (en) * 1940-03-27 1944-02-22 Du Pont Method of manufacturing smokeless powder
US3035950A (en) * 1959-02-27 1962-05-22 Phillips Petroleum Co Reinforced gelled propellants
US3090196A (en) * 1959-09-09 1963-05-21 Olin Mathieson Rocket propellent
US3146495A (en) * 1962-03-07 1964-09-01 Albert A Sanford Seamless plastic tubing extrusion molding machine
US3574800A (en) * 1965-11-01 1971-04-13 Us Army Method of preparing staple-containing propellant grains
US3451102A (en) * 1965-11-10 1969-06-24 American Cyanamid Co Catalyst extrusion header and process of extrusion
GB1207952A (en) * 1966-07-06 1970-10-07 Mini Of Technology Improvements in or relating to extrusion apparatus
US3761330A (en) * 1968-07-29 1973-09-25 Aerojet General Co Filler rich powder and method of making
DE3031369C2 (de) * 1980-08-20 1987-01-02 Pyrotechnische Fabrik F. Feistel GmbH + Co KG, 6719 Göllheim Pyrotechnische Ladung aus Nebelsatz und Anzündsatz und Verfahren zur Herstellung der Nebelmischung und des Anzündsatzes

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191027700A (en) * 1910-11-28 1911-05-25 Messrs Curtis S & Harvey Ltd Improvements in the Manufacture of Tubes from Plastic Materials.
FR1577201A (fr) * 1957-10-19 1969-08-08
GB916534A (en) * 1961-05-17 1963-01-23 Richard Sizer Ltd Improvements in and relating to cube and pellet extrusion of feedstuffs
US3402682A (en) * 1966-10-04 1968-09-24 Gen Mills Inc Die-head for producing hollow particles
FR2169160A1 (fr) * 1972-01-24 1973-09-07 Gillette Co
DE2605481A1 (de) * 1975-02-15 1976-08-26 Icoa Verfahren und vorrichtung zur herstellung polykapillarer elemente
EP0052797A1 (fr) * 1980-11-26 1982-06-02 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Procédé et dispositif pour la fabrication en continu de poudre de charge propulsive
US4413968A (en) * 1982-03-11 1983-11-08 Thiokol Corporation Extrusion die metering device
DE3242301A1 (de) * 1982-11-16 1984-05-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren und vorrichtung zur herstellung ein- oder mehrbasiger treibladungspulver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0232156A2 (fr) * 1986-02-06 1987-08-12 Cadbury Limited Matrice d'extrusion
EP0232156A3 (en) * 1986-02-06 1988-08-17 Cadbury Limited Extrusion die
US4834635A (en) * 1986-02-06 1989-05-30 Cadbury Limited Extrusion die for extruded product

Also Published As

Publication number Publication date
DE3407238A1 (de) 1985-11-21
US4622000A (en) 1986-11-11
EP0153687A3 (fr) 1987-01-07

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Inventor name: FRANKEN, HARALD

Inventor name: MUELLER, DIETMAR, DIPL.-CHEM. DR.