EP1240475A1 - Corps d'obus, et procede de realisation de moyens de guidage faisant saillie radialement - Google Patents

Corps d'obus, et procede de realisation de moyens de guidage faisant saillie radialement

Info

Publication number
EP1240475A1
EP1240475A1 EP00982808A EP00982808A EP1240475A1 EP 1240475 A1 EP1240475 A1 EP 1240475A1 EP 00982808 A EP00982808 A EP 00982808A EP 00982808 A EP00982808 A EP 00982808A EP 1240475 A1 EP1240475 A1 EP 1240475A1
Authority
EP
European Patent Office
Prior art keywords
projectile
guide means
nickel
welding
base body
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.)
Granted
Application number
EP00982808A
Other languages
German (de)
English (en)
Other versions
EP1240475B1 (fr
Inventor
Kurt Steinhoff
Matthias Schupfer
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.)
RUAG Components AG
Original Assignee
EIDGENOESS MUNITIONSFAB THUN
SM Schweizerische Munitionsunternehmung AG
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 EIDGENOESS MUNITIONSFAB THUN, SM Schweizerische Munitionsunternehmung AG filed Critical EIDGENOESS MUNITIONSFAB THUN
Priority to EP00982808A priority Critical patent/EP1240475B1/fr
Publication of EP1240475A1 publication Critical patent/EP1240475A1/fr
Application granted granted Critical
Publication of EP1240475B1 publication Critical patent/EP1240475B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • F42B14/02—Driving bands; Rotating bands

Definitions

  • the invention relates to a projectile with a projectile body and with guide means which are arranged directly on the projectile body and project radially from a base body for guiding the projectile body in a gun barrel.
  • the invention further relates to a method for producing radially projecting guide means on a projectile body a projectile to be guided in a gun barrel.
  • Known projectiles usually have a copper guide means fastened to the surface of the projectile body. Bullets with a plurality of guide means arranged at a defined distance from one another are also known.
  • a circumferential groove is screwed into the projectile body, into which a ring is shrunk, pressed in and / or anchored by welding.
  • a disadvantage of the known bullets is that they can enter copper into the gun barrel when fired. This ultimately leads to embrittlement of the gun barrel and results in a reduction in its mechanical strength.
  • the gun barrel is unusable after a number of launches that are dependent on various initial conditions.
  • the entry of copper into the system environment is also of concern, particularly in the case of ammunition which is intended for training purposes.
  • the invention is therefore based on the problem of designing a projectile of the type mentioned at the outset in such a way that when it is fired it largely prevents copper from entering the gun barrel and its surroundings.
  • the invention is based on the problem of developing a method for producing radially projecting guide means in such a way that there is optimal adhesion of the guide means to the projectile body, the transition zone between the two parts being intended to be able to be optimized or minimized. Extremely high temperature and gas pressure loads on the guide means should also occur without these failing.
  • the subject of the invention is said to be particularly suitable for thin-walled projectiles containing payloads, so-called "carrier pro;] ectiles".
  • the copper content can be reduced almost at will in the area of the projectile body that touches the gun barrel during firing. This reliably prevents the copper from coming loose from the guide means. As a result, the projectile according to the invention largely prevents copper from entering the gun barrel and its surroundings when it is fired.
  • Contamination and / or a reduction in the wear resistance of the inner surfaces of the gun barrel due to a reduction in its strength and through brittleness, due to metallurgical interactions between the materials, can thereby be reliably avoided.
  • the guide means can be manufactured particularly inexpensively if the radially outer region of the guide means is designed as a layer containing nickel attached to a base body.
  • the projectile body has a particularly high stability in the area of the guide means if the material of the basic body is a tempering steel or a maraging steel.
  • connection of the nickel-containing layer to the base body can be produced particularly cost-effectively if the guide means are cohesively connected to the base body.
  • the welding process is particularly suitable. - In order not to receive any impermissible deformations, it is recommended to cool the base body, which is advantageously done by a liquid flowing through the base body.
  • the nickel-containing layer could be applied, for example, on a guide tape.
  • the guide band could then be connected to the projectile body like that of the known projectile. However, it helps to reduce the manufacturing costs of the projectile according to the invention if the guide means are arranged directly on the projectile body.
  • the guiding agents have a particularly high resistance if they have a nickel content of over 90%.
  • the guiding agents have a particularly high resistance if they have a nickel content of over 90%.
  • the second-mentioned problem namely the creation of the aforementioned method for producing radially protruding guide means in such a way that the entry of copper into the gun barrel can be easily avoided, is solved according to the invention by applying a layer containing nickel to a base body at least in one layer.
  • a copper portion of the radially outer region of the guide means can be restricted to an intended, tolerable dimension or completely prevent. Since the radially outer region of the guiding means touches the gun barrel when fired, a transfer of copper from the guiding means to the gun barrel can be reliably prevented, even if the projectile body contains copper.
  • the projectile according to the invention thereby largely prevents copper from entering the gun barrel when it is fired. This reliably prevents the gun barrel from becoming brittle.
  • the basic body can either be the projectile body itself or a guide band to be connected to the projectile body.
  • the production of the guide means according to the invention is particularly cost-effective if the nickel-containing layer is applied in the build-up welding process. Furthermore, the guiding means can thereby have particularly large dimensions.
  • the cracks and the micro-cavities are further reduced if the basic body is exposed to a protective gas atmosphere at 480 ° C. for three to six hours.
  • the base material experiences a further increase in strength.
  • This heat treatment preferably follows a cooling phase to room temperature after the heat treatment carried out at 815 ° C.
  • the tolerances provided for the guide means can be easily maintained if the nickel-containing layer is machined to the intended dimensions after the deposition welding. This machining can take place, for example, in the turning process.
  • FIG. 1b the partial area FIG. 1 a of the projectile after it has been fired
  • FIG. 2 shows a partial area of the projectile shown in FIG. 1 before the guide means is manufactured
  • 3 shows a partial area of the projectile from FIG. 1 after an order welding for the production of the guide means.
  • Figures la and lb represent partial areas of a projectile 1
  • Figure la shows a first partial area with a guiding means 2 in its design before firing in the direction A from a gun barrel, not shown, with a spiral-shaped inner contour.
  • the guide means 2 consists of high-purity nickel and is anchored in a circumferential groove in the projectile body 5 made of 42CrMo4 tempering steel and has shoulders 3.
  • Fig. Lb shows the same section after firing through the gun barrel. This results in characteristic elevations 4 in the guide means 2 projecting from the lateral surface of the projectile body 1, which elevations offset the projectile 1 in the gun barrel m rotation, which causes the notoriously known swirl stabilization on its trajectory.
  • the shoulder 3 of the guide means 2 is deformed in the train - of the gun barrel (not shown) during the firing and serves, in the manner of a piston seal, at the same time as a highly effective sealant even at extremely high gas pressures.
  • the front part of the floor 1 is designed in a notoriously known manner; the firing direction is characterized by an arrow and labeled A.
  • the base body 5 can also be made as a steel ring connected to the projectile body 1.
  • Figures 2 and 3 illustrate two process steps in the manufacture of the guide means 2.
  • the base body 5 is made of 42CrMo4 alloy steel tube or maraging steel. As shown in FIG. 2, this basic body 5 has a smooth outer surface and bevels formed on its groove 7.
  • Circumferential weld seams made of nickel are then applied in the longitudinal direction in the groove 7 on the base body 5 and radially overlapped to the desired thickness of a layer 6, as shown in FIG. 3.
  • the base body 5 is subjected to heat treatment after the circumferential welding layer 6 has been produced.
  • the base body 5 with the layer 6 is first heated to 815 ° C. in an argon atmosphere and this temperature is maintained between one hour and three hours.
  • the basic body 5 is heated to 480 ° C. and this temperature is maintained for a further three to six hours.
  • the layer 6 and the base body 5 have a homogeneous structure.
  • the processing of the welding layer 6 takes place in a notoriously known manner by machining to the predetermined over-caliber dimension.
  • intensive cooling of the base body 5 is of particular importance.
  • water cooling with a connection to the mains was chosen and the flow rate of the water was set in such a way that there was no noticeable heating of the flowing water. This also allowed warpage to be avoided on very thin-walled base bodies, so that deposition welding by means of an arc is also suitable for extremely thin-walled bullets for submunition.
  • Basic body ring made of maragin steel with a caliber of 150 mm (diameter); Length 120 mm; Width of the guide means 52 mm.
  • Cooling Water with an inlet pressure of 2 bar passed through a mandrel that is support for the ring during build-up welding and has grooved baffles for throttling the flow. The measured water flow was around 5 1 / s.
  • Base floor made of maragin steel (closed on one side) with a caliber of 150 mm; Length 700 mm; Width of the guide means 52 mm.
  • Cooling water with an inlet pressure of 2 bar introduced via a flange with 0-ring seal (upper hole) and discharged (lower hole); during the build-up welding there is a turbulent tion.
  • the measured water flow was also about 5 l / s.
  • Pendulum width of the welding electrode (deflection longitudinal to the base body): 52 mm
  • Pendulum time 0.8 s (per half-wave)
  • the service life of the gun barrels is considerably longer when using guide means according to the invention than those made of copper; the range of the storeys can also be increased, since larger loads with correspondingly higher gas pressures are now permissible.
  • the tried and tested method can be adapted to different basic materials and configurations.
  • the welding parameters can also be adapted to meet the technical requirements of the machine or the cooling medium water can be replaced by other flowable substances.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arc Welding In General (AREA)
  • Microwave Tubes (AREA)

Abstract

Selon l'invention, des moyens de guidage (2), constitués d'un nickel le plus pur possible, sont disposés par liaison de matière sur la surface enveloppe d'un obus. On évite ainsi la pénétration de cuivre dans un tube d'arme destiné au tir de l'obus, ce qui a pour résultat d'augmenter la durée de vie dudit tube. La réalisation des moyens de guidage (2) se fait, de préférence, par rechargement ou par soudure dans une atmosphère de protection. On obtient ainsi une fixation fiable des éléments de guidage (2-4) ancrés directement dans un corps d'obus (1) dont la paroi peut être mince, et ces éléments de guidage peuvent subir des sollicitations au tir très élevées.
EP00982808A 1999-12-20 2000-12-20 Corps d'obus, et procede de realisation de moyens de guidage faisant saillie radialement Expired - Lifetime EP1240475B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00982808A EP1240475B1 (fr) 1999-12-20 2000-12-20 Corps d'obus, et procede de realisation de moyens de guidage faisant saillie radialement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99811175A EP1111327A1 (fr) 1999-12-20 1999-12-20 Projectile et procédé pour la production de moyens de guidage dépassant radialement du projectile
EP99811175 1999-12-20
PCT/CH2000/000676 WO2001046641A1 (fr) 1999-12-20 2000-12-20 Corps d'obus, et procede de realisation de moyens de guidage faisant saillie radialement
EP00982808A EP1240475B1 (fr) 1999-12-20 2000-12-20 Corps d'obus, et procede de realisation de moyens de guidage faisant saillie radialement

Publications (2)

Publication Number Publication Date
EP1240475A1 true EP1240475A1 (fr) 2002-09-18
EP1240475B1 EP1240475B1 (fr) 2004-03-03

Family

ID=8243199

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99811175A Withdrawn EP1111327A1 (fr) 1999-12-20 1999-12-20 Projectile et procédé pour la production de moyens de guidage dépassant radialement du projectile
EP00982808A Expired - Lifetime EP1240475B1 (fr) 1999-12-20 2000-12-20 Corps d'obus, et procede de realisation de moyens de guidage faisant saillie radialement

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP99811175A Withdrawn EP1111327A1 (fr) 1999-12-20 1999-12-20 Projectile et procédé pour la production de moyens de guidage dépassant radialement du projectile

Country Status (6)

Country Link
EP (2) EP1111327A1 (fr)
AU (1) AU1979701A (fr)
DE (1) DE50005561D1 (fr)
ES (1) ES2215766T3 (fr)
NO (1) NO323281B1 (fr)
WO (1) WO2001046641A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE306406C (fr) *
FR5398E (fr) * 1904-04-20 1906-03-27 Krupp Ag Projectile en acier avec évidement rempli d'un métal à poids spécifique élevé
US2353693A (en) * 1942-09-28 1944-07-18 Joseph H Church Rotating band
US2813190A (en) * 1954-11-01 1957-11-12 Air Reduction Multiple arc welding
US3888295A (en) * 1973-10-29 1975-06-10 David E Schillinger Method of bonding an annular band of material to an object
DE3539310A1 (de) * 1985-11-06 1987-05-07 Rheinmetall Gmbh Verfahren zum aufbringen eines metallischen fuehrungsbandes auf eine geschosshuelle insbesondere geringer wandstaerke sowie nach diesem verfahren hergestellte geschosshuelle
DE3911575A1 (de) * 1989-04-08 1990-10-11 Rheinmetall Gmbh Geschossanordnung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0146641A1 *

Also Published As

Publication number Publication date
NO323281B1 (no) 2007-02-26
EP1240475B1 (fr) 2004-03-03
AU1979701A (en) 2001-07-03
NO20022941D0 (no) 2002-06-19
NO20022941L (no) 2002-06-20
DE50005561D1 (de) 2004-04-08
WO2001046641A1 (fr) 2001-06-28
EP1111327A1 (fr) 2001-06-27
ES2215766T3 (es) 2004-10-16

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