EP0279732B1 - Projectile perforant à noyau dur et guide ductile et son procédé de fabrication - Google Patents

Projectile perforant à noyau dur et guide ductile et son procédé de fabrication Download PDF

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Publication number
EP0279732B1
EP0279732B1 EP88400271A EP88400271A EP0279732B1 EP 0279732 B1 EP0279732 B1 EP 0279732B1 EP 88400271 A EP88400271 A EP 88400271A EP 88400271 A EP88400271 A EP 88400271A EP 0279732 B1 EP0279732 B1 EP 0279732B1
Authority
EP
European Patent Office
Prior art keywords
guide
core
projectile
undulations
point
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
Application number
EP88400271A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0279732A1 (fr
Inventor
Pierre Sommet
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.)
Francaise De Munitions (sfm) Ste
Original Assignee
Francaise De Munitions (sfm) Ste
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 Francaise De Munitions (sfm) Ste filed Critical Francaise De Munitions (sfm) Ste
Priority to AT88400271T priority Critical patent/ATE56815T1/de
Publication of EP0279732A1 publication Critical patent/EP0279732A1/fr
Application granted granted Critical
Publication of EP0279732B1 publication Critical patent/EP0279732B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
    • F42B12/06—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type with hard or heavy core; Kinetic energy penetrators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
    • F42B12/76—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing
    • F42B12/78—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing of jackets for smallarm bullets ; Jacketed bullets or projectiles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49803—Magnetically shaping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49927—Hollow body is axially joined cup or tube
    • Y10T29/49929—Joined to rod

Definitions

  • the present invention relates to a perforating projectile of caliber less than or equal to 40 mm.
  • the invention also relates to a cartridge comprising such a perforating projectile as well as the method for the manufacture thereof.
  • Known perforating projectiles most often comprise a shell of metal or ductile alloy such as copper or brass which surrounds a core of hard metal such as hardened steel or tungsten carbide embedded in lead.
  • the core of the piercing projectile has on its rear part a Morse cone which is fitted into a complementary cone formed in a guide or shoe made of ductile metal which thus partially covers the hard core.
  • This assembly method makes it possible to obtain good conditions for rotating the core.
  • This projectile thus has a satisfactory perforating power.
  • undulations are made on the outer face of the guide in order to limit the friction between this outer surface and the scratches formed inside the barrel of the shooting weapon.
  • a perforating projectile comprising a hard core, the rear part of which is covered by a guide or shoe made of ductile material.
  • the fixing of this guide on the core is carried out by welding, brazing, gluing, overmolding or by metallic deposit.
  • a perforating bullet according to the preamble of claim 1 has been described and comprising a hard core surrounded by a soft metal casing which is bonded to the core by means of a push-back or shrinking process which makes penetrate the soft metal into recesses existing on the surface of the core.
  • the outer surface of the soft casing remains smooth, so that this casing offers a high friction resistance during its movement inside the barrel of the shooting weapon.
  • the object of the present invention is to remedy the drawbacks of known embodiments, by creating a perforating projectile in which the core and the guide are linked together in such a way that the rotation of the assembly takes place under optimal conditions. and in which the guide has undulations on its outer surface which reduce the friction of the projectile inside the barrel of the shooting weapon, such a projectile being easy and inexpensive to manufacture.
  • the perforating projectile of caliber less than or equal to 40 mm aimed by the invention comprises a core having a front point, this core being of a hard or high density metal or metal alloy, surrounded at the rear of its point by a generally cylindrical guide of ductile metal, the part of the core which is surrounded by the guide having projections and recesses and the guide being crimped on this part of the core by radial compression so that the interior surface of the guide is linked axially and in rotation to said part of the core by means of the projections and recesses of the latter.
  • this projectile is characterized in that the guide is crimped onto said part of the core by electromagnetic forming and in that said part of the core has undulations, the internal surface of the guide in contact with said part of the core conforming to the profile of these undulations and the external surface of the guide reproducing the profile of these undulations being predetermined so that those reproduced on the external surface of the guide having the desired ballistic properties.
  • ductile metal is meant a metal or alloy more ductile than the steel of the barrel of the shooting weapon.
  • Crimping by electromagnetic forming which is known per se in particular from US Pat. No. 4,523,872, consists in introducing the core covered with the guide into a solenoid.
  • the magnetic field generated by this solenoid develops intense forces (Laplace forces) for a few microseconds which not only compress the guide radially on the nucleus, but also make it possible to obtain a true weld, by diffusion of atoms, between this guide and the core.
  • ductile metal such as copper or an alloy such as brass for the guide and steel for the core is optimal for the implementation of electromagnetic forming.
  • this electromagnetic forming thus makes it possible to obtain an excellent bond between the guide and the core, while being perfectly suited to industrial mass production.
  • the dimensions of the guide and of the core do not need to be adjusted with very great precision, since the deformations generated during crimping make it possible to compensate for dimensional differences.
  • the perforating projectile of caliber less than or equal to 40 mm comprises a core 1 having a front point 2 of conventional ogival shape.
  • This core 1 is made of a metal or hard and / or high density metal alloy such as hardened steel and is surrounded at the rear of its tip by a guide 3 of generally cylindrical shape made of ductile metal, such as copper or brass.
  • the part 4 of the core 1 which is surrounded by the guide 3 has projections 5 and recesses 6 and the guide 3 is crimped onto this part 4 of the core by radial compression, so that the inner surface of the guide 3 is axially linked and in rotation to said part 4 of the core via the projections 5 and the recesses 6 of the latter.
  • the guide 3 is crimped on the part 4 of the core 1 by electromagnetic forming.
  • the ogival tip 2 of the core is connected to the part 4 surrounded by the guide 3, by an annular shoulder 7 whose radial width corresponds substantially to the thickness e of the wall of the guide 3, the edge of the latter being in abutment against this shoulder 7.
  • the projections 5 and the recesses 6 formed on the part 4 of the core consist of annular undulations and the inner surface of the guide 3 in contact with this part 4 of the core follows the profile of these ripples.
  • the outer surface of the guide 3 has corrugations 8 which follow the profile of the corrugations 5 formed on the part 4 of the core.
  • the profile of these corrugations 5 is predetermined as a function of the profile sought for the external corrugations 8 of the guide.
  • the maximum diameter di of the pointed tip 2 is slightly less than the through caliber of the barrel of the projectile weapon.
  • the maximum diameter d 4 of the part 4 of the core 1 is less than the diameter d 1 so that the thickness e of the wall of the guide 3 is sufficient to allow its deformation when it comes into engagement with the grooves of the barrel of the weapon.
  • This thickness e is of the order of mm.
  • the amplitude of the corrugations 8 is between 0.5 and 1 mm.
  • the undulations 5 formed on the part 4 of the core 1 are such that the maximum diameter d 4 is equal to d 2 - 2e (d 2 being equal to the caliber of the projectile) and that the minimum diameter ds of the guide is equal to d 3 - 2e (ds being equal to the minimum diameter of the guide which is equal to di in the example of FIG. 1).
  • the undulations 8 the profile of which is constituted in the example of FIG. 1 by successively concave or convex equal arcs of circle, comprise at least two arcs forming bumps which ensure perfect guidance of the projectile inside the barrel, all by limiting friction. Furthermore, the amplitude of these undulations 8 is sufficiently small and their radius is large enough not to affect the aerodynamic properties of the projectile.
  • the part 4 of the core 1 has, opposite the tip 2, a substantially frustoconical surface 9, the small base 10 of which coincides with the rear end of this part.
  • the inner surface of the guide 3 has a substantially frustoconical surface complementary to this substantially frustoconical surface of the part 4 of the core and the guide 3 has a rear wall 11 pressed against the rear end 10 of the core 1.
  • This device comprises a solenoid 13 surrounding the guide 3 engaged on the part 4 of the core 1.
  • This solenoid 13 is connected to a generator 14 of electric current.
  • a capacitor 15 is arranged in parallel with the terminals of the solenoid 13, a capacitor 15 is arranged.
  • the electrical circuit further comprises a charge switch 16 and a discharge switch 17.
  • the copper or brass used for the guide 3 and the steel used for the core 1 form a pair of ideal materials for the implementation of the electromagnetic forming process.
  • the core steel is preferably Z 85 WDCV 6542 steel.
  • Another advantage of this process lies in the fact that it allows, in a single operation, to reproduce on the surface of the guide 3 the undulations which make it possible to limit the friction inside the barrel of the shooting weapon.
  • the guide 3 can be obtained from a simple drawn tube. Furthermore, the corrugations formed on the core do not need to be machined with precision, since the electromagnetic forming gives the corrugations of the guide a smooth surface, even if the corrugations of the core are not machined with great precision. On the contrary, a surface of the core not precisely machined, leaving micro-roughness, is favorable to the adhesion between the guide and the core.
  • the shape of the corrugations formed on the part 4 of the core 1 may be different from that shown in FIG. 1.
  • the guide 3 could be devoid of bottom and made from a simple drawn tube, which further reduces manufacturing costs.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Powder Metallurgy (AREA)
  • Paper (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Stringed Musical Instruments (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Soft Magnetic Materials (AREA)
  • Toys (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Physical Vapour Deposition (AREA)
EP88400271A 1987-02-11 1988-02-05 Projectile perforant à noyau dur et guide ductile et son procédé de fabrication Expired - Lifetime EP0279732B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88400271T ATE56815T1 (de) 1987-02-11 1988-02-05 Panzerbrechendes geschoss mit hartem kern und dehnbarer buchse und verfahren zu dessen herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8701691A FR2610715A1 (fr) 1987-02-11 1987-02-11 Projectile perforant a noyau dur et guide ductile
FR8701691 1987-02-11

Publications (2)

Publication Number Publication Date
EP0279732A1 EP0279732A1 (fr) 1988-08-24
EP0279732B1 true EP0279732B1 (fr) 1990-09-19

Family

ID=9347796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400271A Expired - Lifetime EP0279732B1 (fr) 1987-02-11 1988-02-05 Projectile perforant à noyau dur et guide ductile et son procédé de fabrication

Country Status (21)

Country Link
US (1) US4878434A (pt)
EP (1) EP0279732B1 (pt)
KR (1) KR930000303B1 (pt)
CN (1) CN1017374B (pt)
AT (1) ATE56815T1 (pt)
AU (1) AU596504B2 (pt)
BR (1) BR8805262A (pt)
CS (1) CS271480B2 (pt)
DE (2) DE3860615D1 (pt)
ES (1) ES2003843B3 (pt)
FI (1) FI884648A (pt)
FR (1) FR2610715A1 (pt)
GR (2) GR890300043T1 (pt)
IL (1) IL85373A0 (pt)
IN (1) IN167362B (pt)
MA (1) MA21180A1 (pt)
NO (1) NO166814C (pt)
PT (1) PT86722B (pt)
WO (1) WO1988006266A1 (pt)
YU (1) YU24488A (pt)
ZA (1) ZA88869B (pt)

Families Citing this family (36)

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Publication number Priority date Publication date Assignee Title
DE4016051C2 (de) * 1990-05-18 1994-10-06 Rheinmetall Gmbh Mantelpenetrator
DE19604061C2 (de) * 1996-02-05 1998-07-23 Heckler & Koch Gmbh Geschoß
FI100917B (fi) * 1996-08-14 1998-03-13 Lapua Oy Menetelmä luodin valmistamiseksi ja luoti
US5826320A (en) * 1997-01-08 1998-10-27 Northrop Grumman Corporation Electromagnetically forming a tubular workpiece
US6186072B1 (en) 1999-02-22 2001-02-13 Sandia Corporation Monolithic ballasted penetrator
US7311046B2 (en) * 2001-04-19 2007-12-25 Ruag Ammotec Gmbh Bullet for infantry ammunition
US6973879B1 (en) * 2002-03-16 2005-12-13 Mcelroy Hugh Anthony Monolithic high incapacitation small arms projectile
JP4136802B2 (ja) * 2002-09-27 2008-08-20 株式会社神戸製鋼所 ビード付き円筒形リングの製造方法
US7451705B2 (en) * 2004-03-17 2008-11-18 Fry Grant R Non-discarding sabot projectile system
NO328405B1 (no) * 2005-11-24 2010-02-15 Performance Bullet Production Panserbrytende prosjektil
US7966937B1 (en) 2006-07-01 2011-06-28 Jason Stewart Jackson Non-newtonian projectile
US8171852B1 (en) 2006-10-24 2012-05-08 Peter Rebar Expanding projectile
US8438767B2 (en) 2006-10-24 2013-05-14 P-Bar Co., Llc Expanding projectile
SE533168C2 (sv) * 2008-06-11 2010-07-13 Norma Prec Ab Projektil för skjutvapen
USD733835S1 (en) 2011-07-26 2015-07-07 Ra Brands, L.L.C. Firearm bullet
USD733834S1 (en) 2011-07-26 2015-07-07 Ra Brands, L.L.C. Firearm bullet
US8950333B2 (en) 2011-07-26 2015-02-10 Ra Brands, L.L.C. Multi-component bullet with core retention feature and method of manufacturing the bullet
USD734419S1 (en) 2011-07-26 2015-07-14 Ra Brands, L.L.C. Firearm bullet
USD735289S1 (en) 2011-07-26 2015-07-28 R.A. Brands, L.L.C. Firearm bullet
USD733837S1 (en) 2011-07-26 2015-07-07 Ra Brands, L.L.C. Firearm bullet
USD733252S1 (en) 2011-07-26 2015-06-30 Ra Brands, L.L.C. Firearm bullet and portion of firearm cartridge
USD733836S1 (en) 2011-07-26 2015-07-07 Ra Brands, L.L.C. Firearm bullet
US9250050B2 (en) * 2011-10-21 2016-02-02 Setpoint Systems, Inc. Apparatus, system, and method for ammunition cartridge case annealing
PL2920542T3 (pl) * 2012-11-15 2017-10-31 Ruag Ammotec Gmbh Pocisk z lutowanym rdzeniem pocisku
US9188414B2 (en) 2013-02-15 2015-11-17 Ra Brands, L.L.C. Reduced friction expanding bullet with improved core retention feature and method of manufacturing the bullet
US9726371B2 (en) 2013-05-08 2017-08-08 Whirlpool Corporation Glass and metal burner cap and method of making the same
US9534876B2 (en) 2013-05-28 2017-01-03 Ra Brands, L.L.C. Projectile and mold to cast projectile
US11268791B1 (en) 2014-05-23 2022-03-08 Vista Outdoor Operations Llc Handgun cartridge with shear groove bullet
US10048051B1 (en) * 2015-06-18 2018-08-14 Cutting Edge Bullets, LLC Firearm projectile
FR3039266B1 (fr) * 2015-07-22 2017-09-01 Cime Bocuze Penetrateur comportant un coeur entoure d'une gaine ductile et procede de fabrication d'un tel penetrateur
HRP20221423T1 (hr) * 2016-09-02 2023-01-06 Saltech Ag Projektil s penetratorom
US10352669B2 (en) * 2016-09-30 2019-07-16 Badlands Precision LLC Advanced aerodynamic projectile and method of making same
US10551154B2 (en) * 2017-01-20 2020-02-04 Vista Outdoor Operations Llc Rifle cartridge with improved bullet upset and separation
USD848569S1 (en) 2018-01-20 2019-05-14 Vista Outdoor Operations Llc Rifle cartridge
DE102019126604A1 (de) * 2019-10-02 2021-04-08 Rheinmetall Waffe Munition Gmbh Penetrator, Verwendung eines Penetrators und Geschoss
US11408717B2 (en) 2020-04-29 2022-08-09 Barnes Bullets, Llc Low drag, high density core projectile

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US1322662A (en) * 1919-11-25 Eibeaktt-pbojectile
DE1072515B (pt) *
GB190918589A (en) * 1909-04-15 1910-01-13 Ceska Banka An Improved Projectile.
FR496867A (fr) * 1918-09-24 1919-11-19 Fernand Louis Roux Projectile
US1709414A (en) * 1927-02-02 1929-04-16 Stendebach Friedrich Projectile
GB351004A (en) * 1930-03-15 1931-06-15 Hermann Ernst Gustav Thorismun Improvements in or relating to bullets
FR764833A (fr) * 1933-02-23 1934-05-29 Soc Fr Munitions De Chasse Perfectionnement dans la fabrication des projectiles d'armes à feu
US3143966A (en) * 1959-10-02 1964-08-11 Olin Mathieson Expanding bullet
US4523872A (en) * 1981-08-12 1985-06-18 Grumman Aerospace Corporation Torsion resistant grooved joint
PT77697B (fr) * 1982-11-24 1986-02-12 Ladriere Serge Projectile perfectionne destine a etre decharge par des armes a feu
US4793037A (en) * 1987-02-06 1988-12-27 Carter Herman L Method of making a bullet

Also Published As

Publication number Publication date
DE3860615D1 (de) 1990-10-25
KR930000303B1 (ko) 1993-01-15
CS83488A2 (en) 1990-02-12
GR890300043T1 (en) 1989-05-25
GR3002535T3 (en) 1993-01-25
NO884517L (no) 1988-10-10
DE279732T1 (de) 1989-01-05
KR890700801A (ko) 1989-04-27
PT86722B (pt) 1993-08-31
FI884648A0 (fi) 1988-10-10
WO1988006266A1 (fr) 1988-08-25
AU596504B2 (en) 1990-05-03
IN167362B (pt) 1990-10-13
CN88100863A (zh) 1988-08-31
FI884648A (fi) 1988-10-10
ES2003843A4 (es) 1988-12-01
NO166814C (no) 1991-09-04
PT86722A (pt) 1989-02-28
BR8805262A (pt) 1989-08-15
CS271480B2 (en) 1990-10-12
IL85373A0 (en) 1988-07-31
NO166814B (no) 1991-05-27
ZA88869B (en) 1988-08-08
MA21180A1 (fr) 1988-10-01
ATE56815T1 (de) 1990-10-15
US4878434A (en) 1989-11-07
CN1017374B (zh) 1992-07-08
EP0279732A1 (fr) 1988-08-24
AU1292988A (en) 1988-09-14
FR2610715A1 (fr) 1988-08-12
ES2003843B3 (es) 1991-03-01
NO884517D0 (no) 1988-10-10
YU24488A (en) 1990-10-31

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