EP0977002A3 - Gun barrel with a wear reducing hard chromium layer - Google Patents

Gun barrel with a wear reducing hard chromium layer Download PDF

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Publication number
EP0977002A3
EP0977002A3 EP99110786A EP99110786A EP0977002A3 EP 0977002 A3 EP0977002 A3 EP 0977002A3 EP 99110786 A EP99110786 A EP 99110786A EP 99110786 A EP99110786 A EP 99110786A EP 0977002 A3 EP0977002 A3 EP 0977002A3
Authority
EP
European Patent Office
Prior art keywords
hard chrome
gun barrel
chromium layer
hard chromium
wear reducing
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)
French (fr)
Other versions
EP0977002B1 (en
EP0977002A2 (en
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/en
Publication of EP0977002A3 publication Critical patent/EP0977002A3/en
Application granted granted Critical
Publication of EP0977002B1 publication Critical patent/EP0977002B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

Die Erfindung betrifft ein Waffenrohr mit einer innenseitigen verschleißmindernden Hartchromschicht (3), die eine Vielzahl von Mikrorissen (6) enthält.The invention relates to a weapon barrel with an inside wear-reducing hard chrome layer (3) that a variety of microcracks (6) contains.

Um zu erreichen, daß die Hartchromschicht (3) des Waffenrohres (1) eine gegenüber herkömmlichen Hartchromschichten verbesserte Thermoschockbeständigkeit aufweist, schlägt die Erfindung vor, daß in der Querschnittsfläche der jeweiligen Hartchromschicht (3) mindestens 500 Risse/cm bzw. auf der Oberfläche der Hartchromschicht mindestens 150 Risse/cm vorhanden sind.

Figure 00000001
In order to ensure that the hard chrome layer (3) of the weapon barrel (1) has improved thermal shock resistance compared to conventional hard chrome layers, the invention proposes that at least 500 cracks / cm in the cross-sectional area of the respective hard chrome layer (3) or on the surface of the hard chrome layer there are at least 150 cracks / cm.
Figure 00000001
EP99110786A 1998-07-30 1999-06-04 Gun barrel with a wear reducing hard chromium layer Expired - Lifetime EP0977002B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19834394A DE19834394A1 (en) 1998-07-30 1998-07-30 Gun barrel with a wear-reducing hard chrome layer
DE19834394 1998-07-30

Publications (3)

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

Family

ID=7875873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99110786A Expired - Lifetime EP0977002B1 (en) 1998-07-30 1999-06-04 Gun barrel with a wear reducing hard chromium layer

Country Status (4)

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

Families Citing this family (4)

* 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 (en) * 2004-01-23 2005-08-11 Bayerische Motoren Werke Ag Method for producing a component with an internally coated bore
US8701326B2 (en) 2011-12-08 2014-04-22 Sturm, Ruger & Company, Inc. Pistol barrel system and method
DE102012000686A1 (en) * 2012-01-17 2013-07-18 Rheinmetall Waffe Munition Gmbh Gun barrel with chromed inner profile

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244029A1 (en) * 1971-09-07 1973-03-15 M & T Chemicals Inc PROCESS FOR THE PRODUCTION OF SLIGHTLY INCREASED ELECTROCAL CHROME DEPOSIT
US3943040A (en) * 1974-09-20 1976-03-09 The Harshaw Chemical Company Microcracked chromium from a bath using an organic sulfur compound
GB1456355A (en) * 1974-10-07 1976-11-24 Parker Ste Continentale Electrodeposition of microcracked chromium
FR2549090A1 (en) * 1983-07-13 1985-01-18 Traitements Surface Mecanique Process for protecting a metal surface by electrolytic deposition of a thick layer of microfissured chromium and articles obtained
DE4107273A1 (en) * 1991-03-07 1992-09-10 Rheinmetall Gmbh Hard chromed weapon barrel interior with reduced wear - has cracks and pores in chrome surface which are filled with low friction PTFE particles

Family Cites Families (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985916A (en) * 1970-02-02 1976-10-12 Kaman Sciences Corporation Sealing and densifying chrome plated metal parts
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
AT361527B (en) * 1976-05-14 1981-03-10 Kloeckner Werke Ag METHOD FOR PRODUCING A COMPOSITE
CH638411A5 (en) * 1979-07-20 1983-09-30 Accumold Ag METHOD FOR DEFORMING A WEARED, CONICAL, IN PARTICULAR BENT, CHILLER TUBE.
CH644040A5 (en) * 1979-11-07 1984-07-13 Accumold Ag METHOD FOR TREATING THE INTERIOR SURFACE OF A CHILLER TUBE FOR CONTINUOUS CASTING.
FR2514032A1 (en) * 1981-10-06 1983-04-08 Nicolas Guy CHROME-BASED COATING FOR WEAR-RESISTANT STEEL AND PROCESS FOR PREPARING THE SAME
GR79748B (en) * 1982-12-23 1984-10-31 Ver Edelstahlwerke Ag
US4756677A (en) * 1982-12-23 1988-07-12 Vereinigte Edelstahlwerke Aktiengesellshaft Method of manufacturing a weapon barrel
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 (en) * 1983-04-14 1984-10-18 Evertz, Egon, 5650 Solingen ONE-PIECE CONTINUOUS CASTING CHOCOLATE AND METHOD FOR THEIR PRODUCTION
CH663455A5 (en) * 1984-04-19 1987-12-15 Balzers Hochvakuum TUBE WITH AN INTERNAL COATING.
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
EP0725160A1 (en) * 1991-11-20 1996-08-07 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 (en) * 1994-03-25 1997-03-27 Rheinmetall Ind Gmbh Gun barrel with an erosion-reducing insert and use of the gun barrel in electrical cannons
DE4419864C2 (en) * 1994-06-07 2001-01-11 Rheinmetall W & M Gmbh Electrode for internal electrolytic coating and / or for electropolishing gun barrels
US5415351A (en) * 1994-09-06 1995-05-16 Kraft Tool Company Pneumatic spray gun with improved bearing frame
JP2987768B2 (en) * 1997-03-27 1999-12-06 株式会社シェルター Glued laminated lumber for buildings and building components for framed structures
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 (en) * 1999-04-26 2002-06-27 Rheinmetall W & M Gmbh Method of making a gun barrel
DE19919688A1 (en) * 1999-04-30 2000-11-02 Rheinmetall W & M Gmbh Process for coating the inside of a gun barrel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244029A1 (en) * 1971-09-07 1973-03-15 M & T Chemicals Inc PROCESS FOR THE PRODUCTION OF SLIGHTLY INCREASED ELECTROCAL CHROME DEPOSIT
US3943040A (en) * 1974-09-20 1976-03-09 The Harshaw Chemical Company Microcracked chromium from a bath using an organic sulfur compound
GB1456355A (en) * 1974-10-07 1976-11-24 Parker Ste Continentale Electrodeposition of microcracked chromium
FR2549090A1 (en) * 1983-07-13 1985-01-18 Traitements Surface Mecanique Process for protecting a metal surface by electrolytic deposition of a thick layer of microfissured chromium and articles obtained
DE4107273A1 (en) * 1991-03-07 1992-09-10 Rheinmetall Gmbh Hard chromed weapon barrel interior with reduced wear - has cracks and pores in chrome surface which are filled with low friction PTFE particles

Also Published As

Publication number Publication date
DE19834394A1 (en) 2000-02-03
DE59903519D1 (en) 2003-01-09
EP0977002B1 (en) 2002-11-27
ES2185270T3 (en) 2003-04-16
EP0977002A2 (en) 2000-02-02
US20010029689A1 (en) 2001-10-18
US20020095846A1 (en) 2002-07-25
US6381893B2 (en) 2002-05-07
US6701656B2 (en) 2004-03-09

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