EP1118832A2 - Procédé pour le revêtement de la surface intérieure d'un tube de canon - Google Patents

Procédé pour le revêtement de la surface intérieure d'un tube de canon Download PDF

Info

Publication number
EP1118832A2
EP1118832A2 EP00126825A EP00126825A EP1118832A2 EP 1118832 A2 EP1118832 A2 EP 1118832A2 EP 00126825 A EP00126825 A EP 00126825A EP 00126825 A EP00126825 A EP 00126825A EP 1118832 A2 EP1118832 A2 EP 1118832A2
Authority
EP
European Patent Office
Prior art keywords
chrome
layers
deposited
partial
chrome 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
EP00126825A
Other languages
German (de)
English (en)
Other versions
EP1118832A3 (fr
EP1118832B1 (fr
Inventor
Gert Schlenkert
Horst Reckeweg
Hartmut Wagner
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 Waffe Munition GmbH
Original Assignee
Rheinmetall W&M GmbH
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 Rheinmetall W&M GmbH filed Critical Rheinmetall W&M GmbH
Publication of EP1118832A2 publication Critical patent/EP1118832A2/fr
Publication of EP1118832A3 publication Critical patent/EP1118832A3/fr
Application granted granted Critical
Publication of EP1118832B1 publication Critical patent/EP1118832B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F41A21/22—Barrels which have undergone surface treatment, e.g. phosphating

Definitions

  • the invention relates to a method for coating the inside of a weapon barrel, on the inner surface to avoid erosion in at least one area a chrome layer is applied by electroplating.
  • a disadvantage of this known method is, inter alia, that the electrodeposited ones Hard chrome layers of the increased ammunition do not withstand. The resulting chrome breakouts often make expensive rework required.
  • the slowdown of the growth of crystallite or the growth cessation takes place through Impairment of growth of neighboring grains and / or due to an increased rate of defects in the growth process.
  • the invention has for its object a method for coating the inside of gun barrels to indicate with a galvanically applied hard chrome layer, which to no significant directional mechanical behavior of the respective chrome layer leads, so that when the gun barrels are used as intended, chrome breakouts can be largely excluded.
  • the invention is essentially based on the idea of electrolytic deposition the chrome layer by means of a pulsed electric current one of the number of To deposit current pulses corresponding number of partial chrome layers on one another.
  • the pulse duration of the electrical current is chosen such that the respective Crystallite growth during the individual deposited partial chrome layers before their natural end is interrupted, so that the finished chrome layer is a globular polytropic Has chrome structure.
  • chrome crystallites which are deposited with an unpulsed direct current, about a length of 5 to 10 ⁇ m, arise when using the invention Process crystallites with a length between about 0.2 and 2 microns. This gives not only an isotropic texture, but also when using a pulsed current a grain refinement that also provides better stability against the chrome layer Causes stress.
  • the process also has the advantage that thicker durable by applying multiple layers of chrome with polytropic structure Let chrome layers be produced than this with conventional chrome plating processes is possible.
  • Fig. 1 denotes a tub indicated by dashed lines, in which there is a chromic acid containing electrolytic liquid.
  • a chromic acid containing electrolytic liquid in which there is a chromic acid containing electrolytic liquid.
  • Coating gun barrel 2 arranged.
  • An axially located in the gun barrel 2 rod-shaped electrode 3 and the weapon barrel 2 are connected via electrical lines 4, 5 a current source 6 connected to a downstream control unit 7.
  • the control unit 7 generates an electrolysis pulse-shaped current 8, which seven pulses 9-15 predetermined height and duration having.
  • the respective pulse duration 16 is selected such that the crystallite growth of the partial chrome layers 17-23 deposited by the current pulses 9-15 (FIG. 3) is interrupted before their natural end.
  • the individual partial chrome layers 17-23 may be one that corresponds to the length of the chromium crystallites produced in each case Layer thickness of e.g. Have 0.2 to 2 ⁇ m.
  • the arrows within the individual chrome crystallites mark the texture alignment.
  • the chromium layer 26 consists of a globular polytropic chrome structure.
  • chrome layer 27 is one on the inner surface 25 of the weapon barrel 2 by means of direct current deposited chrome layer 27 is shown, which also has a thickness of 70 microns.
  • the arrows in turn mark the texture alignment.
  • the chrome layer 27 has in in this case a sharp (111) [uvw] texture because this texture layer has a higher growth rate compared to other texture layers.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP00126825A 2000-01-19 2000-12-07 Procédé pour le revêtement de la surface intérieure d'un tube de canon Expired - Lifetime EP1118832B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10001888 2000-01-19
DE10001888A DE10001888A1 (de) 2000-01-19 2000-01-19 Verfahren zur Innenbeschichtung eines Waffenrohres

Publications (3)

Publication Number Publication Date
EP1118832A2 true EP1118832A2 (fr) 2001-07-25
EP1118832A3 EP1118832A3 (fr) 2001-08-22
EP1118832B1 EP1118832B1 (fr) 2004-11-17

Family

ID=7627863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00126825A Expired - Lifetime EP1118832B1 (fr) 2000-01-19 2000-12-07 Procédé pour le revêtement de la surface intérieure d'un tube de canon

Country Status (5)

Country Link
US (1) US6562216B2 (fr)
EP (1) EP1118832B1 (fr)
AT (1) ATE282812T1 (fr)
DE (2) DE10001888A1 (fr)
ES (1) ES2230023T3 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10255853A1 (de) * 2002-11-29 2004-06-17 Federal-Mogul Burscheid Gmbh Herstellung strukturierter Hartchromschichten
DE102004019370B3 (de) * 2004-04-21 2005-09-01 Federal-Mogul Burscheid Gmbh Herstellung einer strukturierten Hartchromschicht und Herstellung einer Beschichtung
US9005420B2 (en) * 2007-12-20 2015-04-14 Integran Technologies Inc. Variable property electrodepositing of metallic structures
DE102008017270B3 (de) * 2008-04-04 2009-06-04 Federal-Mogul Burscheid Gmbh Strukturierte Chrom-Feststoffpartikel-Schicht und Verfahren zu deren Herstellung sowie beschichtetes Maschinenelement
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959088A (en) * 1975-03-19 1976-05-25 The United States Of America As Represented By The Secretary Of The Army Method and apparatus for generating high amperage pulses from an A-C power source
US4138512A (en) * 1977-10-17 1979-02-06 The United States Of America As Represented By The Secretary Of The Army Process for chemical vapor deposition of a homogeneous alloy of refractory metals
FR2460340A1 (fr) * 1979-06-29 1981-01-23 Sygeoda Sa Procede de traitement de pieces en acier
DE3907087A1 (de) * 1989-03-04 1990-09-13 Rheinmetall Gmbh Hochdruckbehaelter
US5433797A (en) * 1992-11-30 1995-07-18 Queen's University Nanocrystalline metals
US5516415A (en) * 1993-11-16 1996-05-14 Ontario Hydro Process and apparatus for in situ electroforming a structural layer of metal bonded to an internal wall of a metal tube
JP3918142B2 (ja) * 1998-11-06 2007-05-23 株式会社日立製作所 クロムめっき部品、クロムめっき方法およびクロムめっき部品の製造方法
DE19853293A1 (de) * 1998-11-19 2000-05-25 Rheinmetall W & M Gmbh Verfahren zur Herstellung eines innenseitig mit einer Hartchromschicht versehenen Waffenrohres

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
DE10001888A1 (de) 2001-07-26
ATE282812T1 (de) 2004-12-15
EP1118832A3 (fr) 2001-08-22
DE50008662D1 (de) 2004-12-23
EP1118832B1 (fr) 2004-11-17
ES2230023T3 (es) 2005-05-01
US6562216B2 (en) 2003-05-13
US20010025796A1 (en) 2001-10-04

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