EP0653503A1 - Procédé pour la fabrication d'un canon d'armes avec un revêtement intérieur résistant à l'usure - Google Patents

Procédé pour la fabrication d'un canon d'armes avec un revêtement intérieur résistant à l'usure Download PDF

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Publication number
EP0653503A1
EP0653503A1 EP94114911A EP94114911A EP0653503A1 EP 0653503 A1 EP0653503 A1 EP 0653503A1 EP 94114911 A EP94114911 A EP 94114911A EP 94114911 A EP94114911 A EP 94114911A EP 0653503 A1 EP0653503 A1 EP 0653503A1
Authority
EP
European Patent Office
Prior art keywords
area
weapon barrel
electropolishing
barrel
protective layer
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
EP94114911A
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German (de)
English (en)
Other versions
EP0653503B1 (fr
Inventor
Horst Reckeweg
Gert Schlenkert
Siegmar Kukulies
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.)
Rheinmetall Industrie AG
Original Assignee
Rheinmetall Industrie 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
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Publication of EP0653503A1 publication Critical patent/EP0653503A1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/02—Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
    • F41A21/04—Barrel liners

Definitions

  • the invention relates to a method for producing a weapon barrel according to the features of the preamble of claim 1.
  • a protective layer In order to obtain an improved service life for gun barrels, they are provided with a protective layer.
  • electrolytically applied chromium has proven itself as a protective layer, although other materials, such as nickel, cadmium or silver, are also used as a protective layer.
  • a weapon barrel is known from US Pat. No. 2,395,044, in which the cargo space and the region of the beginning of the caliber adjoining the cargo space are coated with a chrome layer to reduce erosion.
  • the layer thickness of the chromium in the area of the cargo space is in the size range of about 10 ⁇ m and decreases towards the mouth.
  • a weapon barrel for machine guns is finally known, in which a protective layer of the gun barrel itself is dispensed with and in which at least two replaceable wear-resistant bushings are used instead in the thermally highly stressed area (cargo space, caliber start area of the barrel).
  • the use of such sockets is relatively complex, since correspondingly pre-turned and gas-tight receptacles for the sockets must be present in the weapon barrel. Use of such Sockets on large-caliber gun barrels have therefore not prevailed.
  • the invention has for its object to provide a method for producing a gun barrel, which is provided with a protective layer that is easy to manufacture and that withstands the high thermal loads in the area of the cargo space and the beginning of the caliber, especially with large-caliber gun barrels.
  • the invention is therefore essentially based on the idea of making a recess in a caliber-prefabricated gun barrel, in the area of the cargo space to be provided with the protective layer and in the adjoining caliber area by means of electrochemical removal (electropolishing) and then electrolytically this recess with the protective layer again to fill in.
  • electrochemical removal electrochemical removal
  • electrolytic process electrolytic process for applying the protective layer.
  • the electrode position during the transition from electropolishing to chromium plating may have to be changed in order to ensure a smooth transition of the protective layer in the caliber range.
  • the cargo space-side part of a gun barrel is designated by 1, the cargo area being designated by 2 and the caliber beginning of the gun barrel adjoining the cargo area by 3.
  • An electrode 4 projects into the charge space 2 and the beginning of the caliber 3 and is connected via an electrical line 5 to a power source (not shown).
  • the gun barrel 1 is also connected via a line 6 to the power source (not shown) and forms the anode during the electropolishing process or the cathode during the chrome plating process.
  • the gun barrel 1 Before the start of the electropolishing process, the gun barrel 1 is degreased in a manner known per se. After degreasing, the gun barrel 1 is then placed in a container and removed from a corresponding electrolyte solution, e.g. a phosphoric acid / sulfuric acid mixture. The cathode 4 is then connected via line 5 and the weapon barrel 1 via line 6 to a power source. The electropolishing process is now carried out until as much material of the weapon barrel 1 is removed from the area to be chrome-plated as is to be applied by the subsequent chrome-plating. The corresponding recess resulting from the removal of the weapon barrel material is shown in dashed lines in FIG. 1 and provided with the reference number 7.
  • a corresponding electrolyte solution e.g. a phosphoric acid / sulfuric acid mixture.
  • the cathode 4 is then connected via line 5 and the weapon barrel 1 via line 6 to a power source.
  • the electropolishing process is now carried out until as much material of
  • the shape of the electrode 4 determines the profile of the recess 7 and can e.g. in the front area 8 of the electrode 4 be conical (to produce a recess 7 tapering towards the inner wall of the tube), cylindrical, spherical or curved.
  • the chromium plating is carried out by electrolytic deposition of chromium on the surface of the recess 7 of the weapon barrel 1.
  • sulfuric acid chromic acid can be used, for example.
  • the electrode 4 used as the cathode in the electropolishing process is now used as the anode (FIG. 2).
  • the electropolishing and chromium plating electrolytes have very different scattering properties. Therefore, the electropolished area 7 cannot be completely filled with chromium with the same anode position. Rather, in such a case, a trough-shaped depression is created in the area 9 of the tapered chrome layer 10 in the area of the caliber start 3 (not shown).
  • this trough can be significantly reduced if the anode 4 is shifted towards the mouth of the weapon barrel by a predetermined amount "x" during chrome plating.
  • An almost flat transition from the chrome layer 10 to the adjoining tube wall is obtained if the chrome plating process takes place in at least two partial steps.
  • the anode 4 is shifted towards the mouth of the gun barrel 1 by a predetermined amount (FIG. 2) and left in this position for a chrome-plating period. Then, e.g. after half the process time, the anode 4 is pulled back to the position at which the electropolishing was carried out (FIG. 1) and chromed further.
  • the shifting forward and from the front to the rear position of the anode 4 can also be carried out in several steps or continuously.
  • FIG. 3 shows an exemplary embodiment in which a sharp transition between the coated and uncoated barrel area can be achieved by covering the area of the weapon barrel 1 that is not to be chrome-plated with a corresponding lacquer layer 11.
  • the recess 7 produced by the electropolishing process is also approximately rectangular at its end on the caliber side.
  • the electrode 12 can also be cylindrical in its front region 13, as shown in FIG. 3.
  • the lacquer layer 11 does not have to extend to the muzzle of the barrel, but only to the extent that it is ensured that the anode 12 on the muzzle side no longer causes a chrome coating on the weapon barrel 1.
  • it can be easier to cover everything that is not to be chrome-plated later in the pipe with a suitable varnish.
  • the varnish manufactured and sold by Schering KG under the name Nolan has proven itself as a covering varnish.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP94114911A 1993-10-15 1994-09-22 Procédé pour la fabrication d'un canon d'armes avec un revêtement intérieur résistant à l'usure Expired - Lifetime EP0653503B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4335139A DE4335139A1 (de) 1993-10-15 1993-10-15 Verfahren zur Herstellung eines Waffenrohres mit einer verschleißfesten Innenbeschichtung
DE4335139 1993-10-15

Publications (2)

Publication Number Publication Date
EP0653503A1 true EP0653503A1 (fr) 1995-05-17
EP0653503B1 EP0653503B1 (fr) 1997-05-14

Family

ID=6500193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94114911A Expired - Lifetime EP0653503B1 (fr) 1993-10-15 1994-09-22 Procédé pour la fabrication d'un canon d'armes avec un revêtement intérieur résistant à l'usure

Country Status (4)

Country Link
US (1) US5476581A (fr)
EP (1) EP0653503B1 (fr)
JP (1) JP3058400B2 (fr)
DE (2) DE4335139A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19532170C2 (de) * 1995-08-31 1997-09-18 Ppv Verwaltungs Ag Verfahren zur Bildung eines platinhaltigen Überzugs auf einem Substrat und Verwendung des Verfahrens
DE19635404C2 (de) * 1996-08-31 2000-06-21 Rheinmetall W & M Gmbh Verfahren und Elektrode zum Entgraten und/oder Einrunden von scharfkantigen Übergängen in Rauchabzugsbohrungen in Waffenrohren
EP1081252A1 (fr) * 1999-09-02 2001-03-07 Enthone-OMI (Benelux) B.V. Procédé de placage sélectif
US20050081936A1 (en) * 2003-10-17 2005-04-21 Wilmeth Steven L. Piping for concrete pump systems
US20050081937A1 (en) * 2003-10-17 2005-04-21 Wilmeth Steven L. Piping for abrasive slurry transport systems
SE529744C2 (sv) * 2005-12-22 2007-11-13 Abb Technology Ag Anordning och metod för metallisk beläggning samt användning av anordningen
DE102006025244A1 (de) * 2006-05-29 2007-12-06 Rheinmetall Waffe Munition Gmbh Schutzschicht für Bauteile einer Waffe oder dergleichen
DE102010020329A1 (de) * 2010-05-12 2011-11-17 Diehl Stiftung & Co.Kg Fertigungsverfahren für medizinische Gefäßstützen
DE102012000686A1 (de) 2012-01-17 2013-07-18 Rheinmetall Waffe Munition Gmbh Waffenrohr mit verchromtem Innenprofil
US9546837B1 (en) * 2015-10-09 2017-01-17 Bh5773 Ltd Advanced gun barrel
WO2017210709A1 (fr) * 2016-06-09 2017-12-14 Ritter & Stark Gmbh Dispositif de configuration de l'appareil de réalisation de rayures dans des canons d'armes à feu par processus pecm
US10864567B2 (en) 2018-04-17 2020-12-15 Government Of The United States As Represented By The Secretary Of The Army Systems and methods for electroprocessing a gun barrel using a moving electrode

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2395044A (en) * 1942-04-02 1946-02-19 Walter T Gorton Gun
US2687591A (en) * 1949-10-31 1954-08-31 Us Army Rifled gun barrel with tapered chromium bore wall
EP0084752A1 (fr) * 1982-01-21 1983-08-03 ETAT-FRANCAIS représenté par le Délégué Général pour l' Armement Procédé de chromage intérieur d'un élément tubulaire, anode pour sa mise en oeuvre
US4711705A (en) * 1987-01-15 1987-12-08 M&T Chemicals Inc. Activation composition and method for forming adherent chromium electrodeposits on ferrous metal substrates from high energy efficient baths

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB524036A (en) * 1939-01-20 1940-07-29 Thomas Charles Winfield Improvements in or relating to cylinders of internal combustion engines
DE2045738A1 (de) * 1970-09-16 1972-03-23 Mauser Werke AG, 7238 Oberndorf Waffenrohr mit partieller Innenaus kleidung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2395044A (en) * 1942-04-02 1946-02-19 Walter T Gorton Gun
US2687591A (en) * 1949-10-31 1954-08-31 Us Army Rifled gun barrel with tapered chromium bore wall
EP0084752A1 (fr) * 1982-01-21 1983-08-03 ETAT-FRANCAIS représenté par le Délégué Général pour l' Armement Procédé de chromage intérieur d'un élément tubulaire, anode pour sa mise en oeuvre
US4711705A (en) * 1987-01-15 1987-12-08 M&T Chemicals Inc. Activation composition and method for forming adherent chromium electrodeposits on ferrous metal substrates from high energy efficient baths

Also Published As

Publication number Publication date
DE59402737D1 (de) 1997-06-19
JP3058400B2 (ja) 2000-07-04
DE4335139A1 (de) 1995-04-20
EP0653503B1 (fr) 1997-05-14
JPH07167590A (ja) 1995-07-04
US5476581A (en) 1995-12-19

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