EP0158828A1 - Procédé pour fabriquer un sabot métallique - Google Patents

Procédé pour fabriquer un sabot métallique Download PDF

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Publication number
EP0158828A1
EP0158828A1 EP85102846A EP85102846A EP0158828A1 EP 0158828 A1 EP0158828 A1 EP 0158828A1 EP 85102846 A EP85102846 A EP 85102846A EP 85102846 A EP85102846 A EP 85102846A EP 0158828 A1 EP0158828 A1 EP 0158828A1
Authority
EP
European Patent Office
Prior art keywords
stamping
die
preform
sabot
constitute
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Withdrawn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
EP85102846A
Other languages
German (de)
English (en)
Inventor
David R. Ibach
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.)
Honeywell Inc
Original Assignee
Honeywell Inc
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 Honeywell Inc filed Critical Honeywell Inc
Publication of EP0158828A1 publication Critical patent/EP0158828A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/02—Making machine elements balls, rolls, or rollers, e.g. for bearings
    • B21K1/025—Making machine elements balls, rolls, or rollers, e.g. for bearings of bullets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/06—Sub-calibre projectiles having sabots; Sabots therefor
    • F42B14/061—Sabots for long rod fin stabilised kinetic energy projectiles, i.e. multisegment sabots attached midway on the projectile

Definitions

  • projectiles known as "penetrators” which are not necessarily explosive on impact, but are of density, configuration, and propulsive force sufficient for maximum penetrating effects.
  • One such device is known as a "long rod” penetrator: it is of dense metal such as a tungsten alloy, and is of relatively small diameter compared to the bore of the cannon generally available. It extends along a longitudinal axis from a forward, aerodynamic point to a rearward stabilizing fin structure.
  • the present invention contemplates redesigning the sabot so that its parts can be made by metal forming, using a preformed rod and a compound die. In order to accomplish this, the amount of metal flow required in going from bar stock to the completed stamping is so great that special procedures must be followed if a precise product of stable dimensions is to result.
  • a munition 10 As shown in FIGURE I, a munition 10 according to the invention comprises a penetrator 11 arranged for firing from a cartridge case 12 containing a propulsion explosive 13 which is fired when a primer or percusion cap 14 is impacted by the firing pin of the gun, not ⁇ shown.
  • the munition as shown is inserted into the chamber 15 of the firing piece, which has a barrel 16.
  • the penetrator is shown to extend along a longitudinal axis 18 from a forward portion 19, pointed for aerodynamic reasons, to a rearward fin section 20, _ for flight stabilization. Approximately at its midportion, the penetrator is provided with a set of circumferential buttress grooves 21 for engagement by matching grooves 22 in a sabot 23 to which the mouth 24 of catridge case 12 is crimped at a groove 25.
  • a forwardly tapering protective cap 26 has forward apertures 27 and a rearward lip 28 which engages a forward groove 30 in sabot 23.
  • An obturator ring or a band 31 of nylon surrounds the rearward portion of sabot 23, and is received in a channel 32.
  • sabot 23 was bi-partite, consisting of a pair of machined metallic members having a plane mating face containing the axis 18 of the munition, and held together, and into cap 26, by nylon band 31 which was expanded over the sabot and allowed to contract into peripheral channel 32.
  • FIGURE 2 shows a sabot according to the invention to a slightly larger scale. It is made up of two identical halves 40 and 41 having a mating plane containing the common axis 42. Jointly the halves define a crimping groove 43, a channel 44 for band 31, and a groove 45 for cap 26.
  • the halves are manufactured by a stamping procedure, which forms both the convex outer portion and the concave inner portion containing the necessary buttress grooves. By reason of the forming procedure it is also possible to produce sabot halves with webs 46 and 47 which give a longitudinal stiffening to the structure not readily obtainable in prior, all machined units.
  • FIGURES 3-8 The units can be made of aluminum or magnesium, and FIGURE 3 shows a workpiece 50 severed from bar stock for further treatment.
  • the workpiece is first upset in a first die, by axial force, to produce a first preform 51 having a desired uneven mass distribution along its axis to facilitate further forming.
  • Preform 51 is next hot-forged in a second die, by transverse force, to produce a second preform 52, opposite views of which are shown in FIGURES 5A and 5B.
  • preform 52 has an unsymmetrical mass distribution transverse to the axis, with opposite unsymmetrically formed faces 53 and 54, the latter being generally flat but having a longitudinal groove or cavity 55 bordered by raised ridges 56 and 57.
  • Preform 52 is next hot-forged in a third die, by transverse force, to constitute a first stamping 60 shown in FIGURE 6 to have opposite unsymmetrically formed surfaces 61 and 62, the latter again being basically flat but including a longitudinal cavity 63 having a buttress thread portion 64.
  • the provision of ridges 56 and 57 in second preform 52 has been found to materially improve the sharpness of the buttress threads at the flat surface of first stamping 60.
  • the first stamping 60 is next solution heat treated to bring it to a "W" metallurgical condition, and then is frozen to render its metalography dormant.
  • the stamping is returned to the same third die for cold-forging, to a form shown in FIGURE 7, then artificially aged to a "T8" metallurgical condition, and trimmed to produce a second stamping 65--see FIGURE 8.
  • the sabot half is now ready for anodizing or other final treatment.
  • the operation of the projectile with a stamped sabot is the same as with previous machine sabots.
  • the propulsion gases"from explosive 13 force the sabot out of the cartridge at the crimped joint and propel the projectile down the cannon barrel 16, obturator 13 riding in the rifling of the barrel to prevent escape of propulsion gases and decouple rifling spin action to the projectile.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Forging (AREA)
EP85102846A 1984-03-16 1985-03-13 Procédé pour fabriquer un sabot métallique Withdrawn EP0158828A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59024984A 1984-03-16 1984-03-16
US590249 1984-03-16

Publications (1)

Publication Number Publication Date
EP0158828A1 true EP0158828A1 (fr) 1985-10-23

Family

ID=24361477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85102846A Withdrawn EP0158828A1 (fr) 1984-03-16 1985-03-13 Procédé pour fabriquer un sabot métallique

Country Status (1)

Country Link
EP (1) EP0158828A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2208247A (en) * 1985-07-19 1989-03-15 Mauser Werke Oberndorf Fin-stabilized, discarding-sabot projectile
US5103735A (en) * 1991-06-20 1992-04-14 The United States Of America As Represented By The Secretary Of The Army Splined sabot
US5259321A (en) * 1991-08-23 1993-11-09 Rheinmetall Gmbh Propelling cage for a subcaliber projectile
US5359938A (en) * 1990-10-24 1994-11-01 Olin Corporation Ultra light weight sabot
FR2757623A1 (fr) * 1996-12-06 1998-06-26 Rheinmetall Ind Ag Projectile sous-calibre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1601016A (en) * 1924-07-25 1926-09-28 Rockwood Sprinkler Co Method of making pressers for fliers
US2754576A (en) * 1952-01-30 1956-07-17 Kropp Forge Company Fabrication of forged brake band and the like
GB1239473A (en) * 1968-07-05 1971-07-14 North American Rockwell Aluminum alloy workpieces
US4326464A (en) * 1979-12-10 1982-04-27 The United States Of America As Represented By The Secretary Of The Army Gusset discarding sabot munition
US4360954A (en) * 1981-02-17 1982-11-30 The United States Of America As Represented By The Secretary Of The Army Method of making cast-in-place sabots
EP0068397A1 (fr) * 1981-06-26 1983-01-05 Rheinmetall GmbH Procédé pour la fabrication d'une ébauche pour une cage de propulsion

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1601016A (en) * 1924-07-25 1926-09-28 Rockwood Sprinkler Co Method of making pressers for fliers
US2754576A (en) * 1952-01-30 1956-07-17 Kropp Forge Company Fabrication of forged brake band and the like
GB1239473A (en) * 1968-07-05 1971-07-14 North American Rockwell Aluminum alloy workpieces
US4326464A (en) * 1979-12-10 1982-04-27 The United States Of America As Represented By The Secretary Of The Army Gusset discarding sabot munition
US4360954A (en) * 1981-02-17 1982-11-30 The United States Of America As Represented By The Secretary Of The Army Method of making cast-in-place sabots
EP0068397A1 (fr) * 1981-06-26 1983-01-05 Rheinmetall GmbH Procédé pour la fabrication d'une ébauche pour une cage de propulsion

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2208247A (en) * 1985-07-19 1989-03-15 Mauser Werke Oberndorf Fin-stabilized, discarding-sabot projectile
GB2208247B (en) * 1985-07-19 1989-07-26 Mauser Werke Oberndorf A fin-stabilised dart projectile
US5359938A (en) * 1990-10-24 1994-11-01 Olin Corporation Ultra light weight sabot
US5103735A (en) * 1991-06-20 1992-04-14 The United States Of America As Represented By The Secretary Of The Army Splined sabot
US5259321A (en) * 1991-08-23 1993-11-09 Rheinmetall Gmbh Propelling cage for a subcaliber projectile
FR2757623A1 (fr) * 1996-12-06 1998-06-26 Rheinmetall Ind Ag Projectile sous-calibre
US5959238A (en) * 1996-12-06 1999-09-28 Rheinmetall W & M Gmbh Subcaliber projectile

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19861006

RIN1 Information on inventor provided before grant (corrected)

Inventor name: IBACH, DAVID R.