EP0977002A2 - Tube de canon muni d'une couche de chrome dur pour réduire l'usure - Google Patents

Tube de canon muni d'une couche de chrome dur pour réduire l'usure Download PDF

Info

Publication number
EP0977002A2
EP0977002A2 EP99110786A EP99110786A EP0977002A2 EP 0977002 A2 EP0977002 A2 EP 0977002A2 EP 99110786 A EP99110786 A EP 99110786A EP 99110786 A EP99110786 A EP 99110786A EP 0977002 A2 EP0977002 A2 EP 0977002A2
Authority
EP
European Patent Office
Prior art keywords
cracks
gun barrel
chrome
chrome layer
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
EP99110786A
Other languages
German (de)
English (en)
Other versions
EP0977002B1 (fr
EP0977002A3 (fr
Inventor
Gert Schlenkert
Hartmut Wagner
Horst Reckeweg
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 W&M 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 EP0977002A2 publication Critical patent/EP0977002A2/fr
Publication of EP0977002A3 publication Critical patent/EP0977002A3/fr
Application granted granted Critical
Publication of EP0977002B1 publication Critical patent/EP0977002B1/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
    • F41A21/02—Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
    • F41A21/04—Barrel liners
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12632—Four or more distinct components with alternate recurrence of each type component

Definitions

  • the invention relates to a weapon barrel with an inside wear-reducing hard chrome layer, which a variety of Contains micro cracks.
  • a disadvantage of these known gun tubes is other that their production is relatively expensive.
  • those located inside the chrome layer Micro cracks should not be filled with the sliding layer, so that these retain their chrome-inducing effects.
  • the present invention is based on the object Specify gun barrel, its hard chrome layer opposite one conventional hard chrome layers improved thermal shock resistance has without this through the microcracks a layer of high lubricity must be filled.
  • the invention is based on the idea that Number of micro cracks in the hard chrome layer compared to gun barrels with conventional hard chrome layers, being in the cross-sectional area of the respective hard chrome layer at least 500 cracks / cm or on the surface of the Coating at least 150 cracks / cm are present.
  • the fact that an increase in the number of cracks within the Hard chrome layer to improve thermal shock resistance of the gun barrel is surprising. Because there the micro cracks in known wadding triggers for chipping the number of chromium layers, it is obvious at first to keep the micro cracks as small as possible.
  • the surprisingly caused by the increase in the crack number improved thermal shock resistance of hard chrome can be explained as follows:
  • the shot is subject to very brittle chrome layer high loads that lead to accordingly high thermally induced strains and stresses to lead. Once the strains become elastic due to the chrome layer exceed the recordable share, they will be via the existing and additional cracks (expansion joints) added.
  • the conventional chrome layers where the number of cracks measured in cross section is approximately between 200 and 400 cracks / cm or that on the surface of the coating counted number of cracks is between 40 and 70 cracks / cm-, the cracks have a relatively high amount of elongation at one take such thermal shock so that they are too relative large cracks grow together, which in turn for the Chromium breakouts are responsible.
  • the invention now proposes by increasing the number of cracks to minimize the amount of elongation related to the individual crack (Pseudo-productility), so that a growing together larger Cracks responsible for chrome breakouts no longer can arise.
  • the gun barrels according to the invention have in addition to the improved Thermal shock resistance has the advantage over that well-known chrome-plated gun barrels with chrome layers greater wall thickness can be applied to the gun barrel can, which allow better protection of the pipe material.
  • the chrome layers of the invention Gun barrels less sensitive to mechanical Loads (e.g. with floor contact) and therefore also advantageous can be used in machine guns.
  • the composition can influence the frequency of cracks of the chromium plating electrolyte, the chromium plating temperature and the type of current supply when the gun barrel is chrome-plated take place, the optimal parameters for the respective application can be determined by tests have to.
  • 1 designates a gun barrel that one Cargo space 2 includes.
  • the gun barrel 1 is with a hard chrome layer 3 provided the wall thickness 4 and extends in the direction of the longitudinal axis 5.
  • Fig.2 are in the hard chrome layer 3 shows a large number of microcracks 6, according to the invention in the cross-sectional area of the respective hard chrome layer at least 500 cracks / cm or on the surface the coating has at least 150 cracks / cm.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Physical Vapour Deposition (AREA)
EP99110786A 1998-07-30 1999-06-04 Tube de canon muni d'une couche de chrome dur pour réduire l'usure Expired - Lifetime EP0977002B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19834394 1998-07-30
DE19834394A DE19834394A1 (de) 1998-07-30 1998-07-30 Waffenrohr mit einer verschleißmindernden Hartchromschicht

Publications (3)

Publication Number Publication Date
EP0977002A2 true EP0977002A2 (fr) 2000-02-02
EP0977002A3 EP0977002A3 (fr) 2000-03-29
EP0977002B1 EP0977002B1 (fr) 2002-11-27

Family

ID=7875873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99110786A Expired - Lifetime EP0977002B1 (fr) 1998-07-30 1999-06-04 Tube de canon muni d'une couche de chrome dur pour réduire l'usure

Country Status (4)

Country Link
US (2) US6381893B2 (fr)
EP (1) EP0977002B1 (fr)
DE (2) DE19834394A1 (fr)
ES (1) ES2185270T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6594936B1 (en) * 2002-10-03 2003-07-22 Gary Sniezak Method for lining a gun barrel
DE102004003403A1 (de) * 2004-01-23 2005-08-11 Bayerische Motoren Werke Ag Verfahren zur Herstellung eines Bauteils mit einer innenbeschichteten Bohrung
RU2419757C1 (ru) * 2010-05-31 2011-05-27 Открытое акционерное общество "Акционерная Компания "Туламашзавод" Способ изготовления ствола артиллерийского орудия
US8701326B2 (en) 2011-12-08 2014-04-22 Sturm, Ruger & Company, Inc. Pistol barrel system and method
DE102012000686A1 (de) * 2012-01-17 2013-07-18 Rheinmetall Waffe Munition Gmbh Waffenrohr mit verchromtem Innenprofil

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4107273A1 (de) 1991-03-07 1992-09-10 Rheinmetall Gmbh Waffenrohr

Family Cites Families (33)

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US3985916A (en) * 1970-02-02 1976-10-12 Kaman Sciences Corporation Sealing and densifying chrome plated metal parts
AU4610272A (en) * 1971-09-07 1974-03-07 M & T Chemicals Inc Wearing surface
US3780465A (en) * 1972-06-01 1973-12-25 Us Navy Wear resistant gun barrel and method of making the same
US4051275A (en) * 1974-06-21 1977-09-27 Forestek Clarence W Embedding and compacting particles in porous surfaces
US3943040A (en) * 1974-09-20 1976-03-09 The Harshaw Chemical Company Microcracked chromium from a bath using an organic sulfur compound
FR2287532A1 (fr) * 1974-10-07 1976-05-07 Parker Ste Continentale Perfectionnements relatifs au depot electrolytique de chrome microfissure
AT361527B (de) * 1976-05-14 1981-03-10 Kloeckner Werke Ag Verfahren zur herstellung eines verbundwerk- stoffes
CH638411A5 (de) * 1979-07-20 1983-09-30 Accumold Ag Verfahren zum verformen eines verschlissenen, konischen, insbesondere gebogenen kokillenrohres.
CH644040A5 (de) * 1979-11-07 1984-07-13 Accumold Ag Verfahren zur behandlung der innenoberflaeche eines kokillenrohres zum stranggiessen.
FR2514032A1 (fr) * 1981-10-06 1983-04-08 Nicolas Guy Revetement a base de chrome pour acier resistant a l'usure et procede de preparation
US4756677A (en) * 1982-12-23 1988-07-12 Vereinigte Edelstahlwerke Aktiengesellshaft Method of manufacturing a weapon barrel
GR79748B (fr) * 1982-12-23 1984-10-31 Ver Edelstahlwerke Ag
US4435455A (en) * 1983-01-10 1984-03-06 United Technologies Corporation Compliant composite tubular liners of fiber reinforced glass/glass-ceramic having utility as gun barrel liners
DE3313503A1 (de) * 1983-04-14 1984-10-18 Evertz, Egon, 5650 Solingen Einteilige durchlaufstranggiesskokille und verfahren zu ihrer herstellung
FR2549090A1 (fr) * 1983-07-13 1985-01-18 Traitements Surface Mecanique Procede de protection d'une surface metallique par depot electrolytique d'une couche epaisse de chrome microfissure et pieces obtenues
CH663455A5 (de) * 1984-04-19 1987-12-15 Balzers Hochvakuum Rohr mit einer innenbeschichtung.
USH543H (en) * 1986-10-10 1988-11-01 The United States Of America As Represented By The Secretary Of The Army Laminated chromium composite
US4896581A (en) * 1988-12-30 1990-01-30 Richard Cole Accurizer
US4911060A (en) * 1989-03-20 1990-03-27 The United States Of America As Represented By The Secretary Of The Army Reduced weight gun tube
US5074189A (en) * 1989-12-22 1991-12-24 Legend Ammunition, Inc. Electrically-fired and magnetically actuated firearm
US5298092A (en) * 1990-05-17 1994-03-29 The Boeing Company Non-chromated oxide coating for aluminum substrates
US5182139A (en) * 1991-09-16 1993-01-26 The United States Of America As Represented By The Secretary Of The Army Ultrasonic realtime determination and display of thickness of chromium on gun barrels
US5580398A (en) * 1991-11-20 1996-12-03 Ohmi; Tadahiro Method of forming passive oxide film based on chromium oxide, and stainless steel
US5341719A (en) * 1992-12-14 1994-08-30 General Electric Company Multi-layer composite gun barrel
IL107544A0 (en) * 1993-11-09 1994-02-27 Golan Galvanics Ltd Electrolyte for electroplating of chromium based coating having improved wear resistance corrosion resistance and plasticity
USH1365H (en) * 1994-02-04 1994-11-01 The United States Of America As Represented By The Secretary Of The Air Force Hybrid gun barrel
DE4410325C2 (de) * 1994-03-25 1997-03-27 Rheinmetall Ind Gmbh Waffenrohr mit einer erosionsmindernden Einlage und Verwendung des Waffenrohres in elektrischen Kanonen
DE4419864C2 (de) * 1994-06-07 2001-01-11 Rheinmetall W & M Gmbh Elektrode zur elektrolytischen Innenbeschichtung und/oder zum Elektropolieren von Waffenrohren
US5415351A (en) * 1994-09-06 1995-05-16 Kraft Tool Company Pneumatic spray gun with improved bearing frame
JP2987768B2 (ja) * 1997-03-27 1999-12-06 株式会社シェルター 建築物における構造用集成材及び骨組構造用建築部材
US5841057A (en) * 1997-10-09 1998-11-24 The United States Of America As Represented By The Secretary Of The Navy Method and apparatus for liquid injection to reduce gun barrel erosion
DE19918794C2 (de) * 1999-04-26 2002-06-27 Rheinmetall W & M Gmbh Verfahren zur Herstellung eines Waffenrohres
DE19919688A1 (de) * 1999-04-30 2000-11-02 Rheinmetall W & M Gmbh Verfahren zur Innenbeschichtung eines Waffenrohres

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4107273A1 (de) 1991-03-07 1992-09-10 Rheinmetall Gmbh Waffenrohr

Also Published As

Publication number Publication date
US6381893B2 (en) 2002-05-07
US20020095846A1 (en) 2002-07-25
EP0977002B1 (fr) 2002-11-27
EP0977002A3 (fr) 2000-03-29
DE59903519D1 (de) 2003-01-09
ES2185270T3 (es) 2003-04-16
DE19834394A1 (de) 2000-02-03
US20010029689A1 (en) 2001-10-18
US6701656B2 (en) 2004-03-09

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