EP0653503B1 - Method for making a gun barrel with wear resistant internal coating - Google Patents
Method for making a gun barrel with wear resistant internal coating Download PDFInfo
- Publication number
- EP0653503B1 EP0653503B1 EP94114911A EP94114911A EP0653503B1 EP 0653503 B1 EP0653503 B1 EP 0653503B1 EP 94114911 A EP94114911 A EP 94114911A EP 94114911 A EP94114911 A EP 94114911A EP 0653503 B1 EP0653503 B1 EP 0653503B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- barrel
- fact
- accordance
- coating
- zone
- 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.)
- Expired - Lifetime
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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 interchangeable 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 part of a weapon barrel on the cargo space side is designated by 1, the cargo space being identified by 2 and the caliber beginning of the weapon barrel following the cargo space 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 effect a recess 7 tapering towards the inner wall of the tube), cylindrical, spherical or curved.
- the chromium plating is carried out by electrolytically depositing 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 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 chrome-plated 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.
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines Waffenrohres nach den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a method for producing a weapon barrel according to the features of the preamble of
Um eine verbesserte Lebensdauer von Waffenrohren zu erhalten, werden diese mit einer Schutzschicht versehen. Dabei hat sich als Schutzschicht insbesondere elektrolytisch aufgebrachtes Chrom bewährt, wenngleich auch andere Materialien, wie Nickel, Kadmium oder Silber, als Schutzschicht verwendet werden.In order to obtain an improved service life for gun barrels, they are provided with a protective layer. In particular, 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.
Aus der US-PS 2,395,044 ist beispielsweise ein Waffenrohr bekannt, bei dem eine Beschichtung des Ladungsraumes und des sich an den Ladungsraum anschließenden Bereich des Kaliberanfangs mit einer Chromschicht zur Verminderung der Erosion erfolgt. Dabei liegt die Schichtdicke des Chroms im Bereich des Ladungsraumes im Größenbereich von etwa 10 µm und nimmt zur Mündung hin ab.For example, 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 µm and decreases towards the mouth.
Derartige geringe Schichtdicken der Schutzschicht im Bereich des Ladungsraumes bewirken allerdings bei großkalibrigen Rohren (z.B. bei Waffenrohren mit einem Kaliber von 155 mm) keine ausreichende Lebensdauerverbesserung gegenüber unbeschichteten Waffenrohren. Vielmehr hat sich gezeigt, daß bei derartigen Waffenrohren Schichtdicken in der Größenordnung von 100 - 200 µm erforderlich sind. Allerdings erfordert das elektrolytische Aufbringen entsprechender Schichtdicken bisher eine aufwendige mechanische Vor- und Nachbehandlung der Waffenrohre.Such small layer thicknesses of the protective layer in the area of the cargo space, however, cause large-caliber ones Pipes (e.g. with gun barrels with a caliber of 155 mm) do not improve the service life sufficiently compared to uncoated gun barrels. Rather, it has been shown that layer thicknesses of the order of 100-200 μm are required with such gun barrels. However, the electrolytic application of appropriate layer thicknesses has hitherto required complex mechanical pre- and post-treatment of the weapon barrels.
Aus der US-PS 2,687,591 ist ferner ein mit einer Schutzschicht versehenes Waffenrohr bekannt, bei dem die Dicke der Schutzschicht zur Mündung hin zunimmt. Derartige Waffenrohre haben sich zumindest bei großkalibrigen Rohren nicht bewährt, da die höchsten thermischen Beanspruchungen des Waffenrohres am Geschoßeinlauf, d.h. am Übergang vom Patronenlager zu den Zügen, liegen und in diesem Bereich auch die Schutzschichtdicke am größten sein muß. Außerdem haben Versuche der Anmelderin ergeben, daß im vorderen Bereich der Waffenrohre die Schutzschicht häufig aufgrund der starken mechanischen Belastungen zerstört wird und diese Stellen dann zu Gasschlupf und Turbulenzen führen, die ihrerseits dann erosionsfördernd sind.From US Pat. No. 2,687,591 a weapon barrel provided with a protective layer is also known, in which the thickness of the protective layer increases towards the muzzle. Such gun barrels have not proven themselves, at least with large-caliber barrels, since the highest thermal stresses on the barrel at the bullet inlet, i.e. at the transition from the cartridge chamber to the trains, and the protective layer thickness must be greatest in this area. In addition, tests by the applicant have shown that the protective layer in the front area of the gun barrels is frequently destroyed due to the strong mechanical loads and these points then lead to gas slip and turbulence, which in turn then promote erosion.
Aus der DE-OS 2 045 738 ist schließlich ein Waffenrohr für Maschinenwaffen bekannt, bei dem auf eine Schutzschicht des Waffenrohres selbst verzichtet wird und bei dem stattdessen in dem thermisch hochbelasteten Bereich (Ladungsraum, Kaliberanfangsbereich des Rohres) mindestens zwei auswechselbare verschleißfeste Buchsen eingesetzt werden. Die Verwendung derartiger Buchsen ist relativ aufwendig, da entsprechend vorgedrehte und gasdichte Aufnahmen für die Buchsen in dem Waffenrohr vorhanden sein müssen. Eine Verwendung derartiger Buchsen bei großkalibrigen Waffenrohren hat sich daher nicht durchgesetzt.From DE-OS 2 045 738 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 interchangeable 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.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung eines Waffenrohres anzugeben, welches mit einer Schutzschicht versehen ist, die einfach herzustellen ist und die den hohen thermischen Belastungen im Bereich des Ladungsraumes und des Kaliberanfangs, insbesondere auch bei großkalibrigen Waffenrohren, standhält.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.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst. Die Unteransprüche betreffen besonders vorteilhafte Ausführungsformen der Erfindung.This object is achieved by the features of the characterizing part of
Der Erfindung liegt also im wesentlichen der Gedanke zugrunde, in einem kalibergenau vorgefertigten Waffenrohr, in dem mit der Schutzschicht zu versehenden Bereich des Ladungsraumes und des sich daran anschließenden Kaliberbereiches mittels elektrochemischen Abtragens (Elektropolierens) eine Ausnehmung einzubringen und anschließend elektrolytisch diese Ausnehmung mit der Schutzschicht wieder auszufüllen. Vorzugsweise wird dabei die gleiche Elektrode für den Elektropolierungsvorgang und den elektrolytischen Vorgang zum Aufbringen der Schutzschicht verwendet.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. The same electrode is preferably used for the electropolishing process and the electrolytic process for applying the protective layer.
Durch ein derartiges Verfahren ist es auf einfache Weise möglich, das Waffenrohr mit relativ dicken Schutzschichten von 100 bis 200 µm zu versehen, ohne daß etwa eine mechanische Nachbearbeitung oder ein aufwendiges mechanisches Abtragen des Rohrmaterials vor dem Aufbringen der Schutzschicht erforderlich ist.By means of such a method, it is possible in a simple manner to provide the weapon barrel with relatively thick protective layers of 100 to 200 μm, without the need for mechanical reworking or complex mechanical removal of the barrel material before the protective layer is applied.
Aufgrund der unterschiedlichen Eigenschaften der Elektropolierungs- und Verchromungselektrolyten und damit auch der unterschiedlichen Feldverteilung in den Elektrolyten, muß allerdings beachtet werden, daß die Elektrodenstellung beim Übergang vom Elektropolieren zum Verchromen unter Umständen verändert werden muß, um einen ebenen Übergang der Schutzschicht im Kaliberbereich zu gewährleisten.Due to the different properties of the electropolishing and chromium plating electrolytes and thus also the different field distribution in the electrolytes, it must be noted that 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.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus den folgenden anhand von Figuren erläuterten Ausführungsbeispielen. Es zeigen:
- Fig.1
- den Querschnitt eines Teiles eines Waffenrohres, der mit einer Chromschicht versehen werden soll, vor dem Elektropolierungsprozess;
- Fig.2
- den Querschnitt des in den Fig.1 dargestellten Waffenrohres nach dem Verchromungsvorgang und
- Fig.3
- den Querschnitt des in Fig. 1 dargestellten Waffenrohres mit einer Lackschicht zur Begrenzung des Elektropolierungs- und Verchromungsbereiches.
- Fig. 1
- the cross section of a part of a gun barrel, which is to be provided with a chrome layer, before the electropolishing process;
- Fig. 2
- the cross section of the gun barrel shown in Figure 1 after the chrome plating and
- Fig. 3
- the cross section of the gun barrel shown in Fig. 1 with a layer of paint to limit the electropolishing and chrome plating.
In Fig. 1 ist mit 1 der ladungsraumseitige Teil eines Waffenrohres bezeichnet, wobei der Ladungsraum mit 2 und der sich an den Ladungsraum anschließende Kaliberanfang des Waffenrohres mit 3 gekennzeichnet sind. In den Ladungsraum 2 und den Kaliberanfang 3 ragt eine Elektrode 4 hinein, die über eine elektrische Leitung 5 mit einer nicht dargestellten Stromquelle verbunden ist. Das Waffenrohr 1 ist ebenfalls über eine Leitung 6 mit der nicht dargestellten Stromquelle verbunden und bildet bei dem Elektropolierungsvorgang die Anode bzw. bei dem Verchromungsvorgang die Kathode.In FIG. 1, the part of a weapon barrel on the cargo space side is designated by 1, the cargo space being identified by 2 and the caliber beginning of the weapon barrel following the cargo space by 3. An electrode 4 projects into the
Vor Beginn des Elektropolierungsvorganges erfolgt zunächst in an sich bekannter Weise eine Entfettung des Waffenrohres 1. Nach dem Entfetten wird dann das Waffenrohr 1 in einen Behälter eingebracht und von einer entsprechenden Elektrolytlösung, z.B. einem Phosphorsäure/Schwefelsäure-Gemisch, durchströmt. Die Kathode 4 wird anschließend über die Leitung 5 sowie das Waffenrohr 1 über die Leitung 6 mit einer Stromquelle verbunden. Der Elektropolierungsvorgang wird nun so lange durchgeführt, bis von dem später zu verchromenden Bereich soviel Material des Waffenrohres 1 abgetragen ist, wie durch die nachfolgende Verchromung aufgebracht werden soll. In Fig.1 ist die entsprechende durch die Abtragung des Waffenrohrmaterials sich ergebende Ausnehmung gestrichelt dargestellt und mit dem Bezugszeichen 7 versehen.Before the start of the electropolishing process, the
Die Form der Elektrode 4 bestimmt das Profil der Ausnehmung 7 und kann im vorderen Bereich 8 der Elektrode 4 z.B. konusförmig (um etwa eine sich zur Rohrinnenwand hin verjüngende Ausnehmung 7 zu bewirken), zylindrisch, ballig oder kurvenförmig ausgebildet sein.The shape of the electrode 4 determines the profile of the
Nach dem Elektropolieren erfolgt die Verchromung durch elektrolytisches Abscheiden von Chrom auf der Oberfläche der Ausnehmung 7 des Waffenrohres 1. Dabei kann als Elektrolyt z.B. schwefelsaure Chromsäure verwendet werden. Erfindungsgemäß wird die bei dem Elektropolierungsvorgang als Kathode benutzte Elektrode 4 nun als Anode verwendet (Fig.2). Allerdings hat sich gezeigt, daß die Elektropolierungs- und chromungselektrolyte stark unterschiedliche Streueigenschaften aufweisen. Daher kann der elektropolierte Bereich 7 bei gleicher Anodenstellung nicht vollständig durch Chrom aufgefüllt werden. Es entsteht in einem derartigen Fall vielmehr eine muldenförmige Vertiefung im Bereich 9 der sich verjüngenden Chromschicht 10 im Bereich des Kaliberanfangs 3 (nicht dargestellt).After the electropolishing, the chromium plating is carried out by electrolytically depositing chromium on the surface of the
Erfindungsgemäß läßt sich diese Mulde wesentlich verringern, wenn die Anode 4 beim Verchromen um einen vorgegebenen Betrag "x" zur Mündung des Waffenrohres hin verschoben wird. Einen nahezu ebenen Übergang von der Chromschicht 10 zu der sich anschließenden Rohrwand erhält man, wenn der Verchromungsvorgang in mindestens zwei Teilschritten erfolgt. Dazu wird die Anode 4 nach der Elektropolierung um einen vorgegebenen Betrag zur Mündung des Waffenrohres 1 hin verschoben (Fig.2) und während eines vorgegebenen Zeitraumes zum Verchromen in dieser Position belassen. Anschließend wird, z.B. nach der Hälfte der Prozeßzeit, die Anode 4 wieder auf die Position, bei der die Elektropolierung erfolgte, zurückgezogen (Fig.1) und weiter verchromt. Die Verschiebung nach vorne und von der vorderen in die hintere Position der Anode 4 kann auch in mehreren Schritten oder kontinuierlich vorgenommen werden.According to the invention, 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
Fig.3 zeigt ein Ausführungsbeispiel, bei dem durch eine Abdeckung des nicht zu verchromenden Bereiches des Waffenrohres 1 mit einer entsprechenden Lackschicht 11 ein scharfer Übergang zwischen dem beschichteten und unbeschichteten Rohrbereich erzielt werden kann. Entsprechend ist auch die durch den Elektropolierungsvorgang erzeugte Ausnehmung 7 an ihrem kaliberseitigen Ende annähernd rechteckig ausgebildet. Die Elektrode 12 kann in diesem Fall in ihrem vorderen Bereich 13 -wie in Fig.3 dargestellt- auch zylindrisch ausgebildet sein. Außerdem muß die Lackschicht 11 sich nicht bis zur Rohrmündung erstrecken, sondern lediglich so weit, daß sichergestellt ist, daß mündungsseitig durch die Anode 12 keine Chrombeschichtung auf dem Waffenrohr 1 mehr verursacht wird. Allerdings kann es verfahrenstechnisch einfacher sein, alles, was später im Rohr nicht verchromt werden soll, durch einen entsprechenden Lack abzudecken. Als Abdecklack hat sich insbesondere der von der Fa. Schering KG unter der Bezeichnung Nolan hergestellte und vertriebene Lack bewährt.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
- 11
- WaffenrohrGun barrel
- 22nd
- LadungsraumCargo space
- 33rd
- KaliberanfangCaliber start
- 44th
- Elektrode, Kathode, AnodeElectrode, cathode, anode
- 55
- elektrische Leitungelectrical line
- 66
- elektrische Leitungelectrical line
- 77
- AusnehmungRecess
- 88th
- vordere Bereich der Elektrodefront area of the electrode
- 99
- BereichArea
- 1010th
- ChromschichtChrome layer
- 1111
- LackschichtPaint layer
- 1212th
- Elektrode, Kathode, AnodeElectrode, cathode, anode
- 1313
- vordere Bereich der Elektrodefront area of the electrode
Claims (7)
- Method for the production of a gun barrel (1) having a wear resistant internal coating (10) applied by an electrolytic method in the zone of the loading chamber (2) and of the calibre part (3) of the barrel (12) which is subject to high thermal stresses and which immediately follows loading chamber (2), characterised by the fact that in a barrel (1) prefabricated to the precise calibre by electrochemical erosion of the zone (2,3), and to be provided with a protective coating (10), material is removed from the barrel (1) by an amount which is then reapplied as the protective coating (10).
- Method in accordance with Claim 1, characterised by the fact that by electrochemical erosion in the zone of the loading chamber of the barrel (1) a layer of material of between 100 and 200 µm is removed.
- Method in accordance with Claim 1 or 2, characterised by the fact that an electrode (4,12) required for the electrochemical erosion operation is also used as the anode for the electrolytic coating of the barrel (1).
- Method in accordance with Claim 3, characterised by the fact that the front zone (8,13) of the anode (4,12) is cylindrical, conical, crown-shaped or of curved form.
- Method in accordance with Claim 3 or 4, characterised by the fact that the front zone (8,13) of the electrode (4,12) for the electrolytic internal coating is displaced continuously or discontinuously in such a way as to produce an even transition over the tapering zone (9) of the protective coating (10).
- Method in accordance with any one of Claims 1 to 5, characterised by the fact that chromium is used for the electrolytic internal coating.
- Method in accordance with any one of Claims 1 to 6, characterised by the fact that the part of the barrel (1) which is not to be provided with a protective coating (10) is at least in part covered with a coating of a lacquer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4335139A DE4335139A1 (en) | 1993-10-15 | 1993-10-15 | Process for manufacturing a weapon barrel with a wear-resistant inner coating |
| DE4335139 | 1993-10-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0653503A1 EP0653503A1 (en) | 1995-05-17 |
| EP0653503B1 true EP0653503B1 (en) | 1997-05-14 |
Family
ID=6500193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94114911A Expired - Lifetime EP0653503B1 (en) | 1993-10-15 | 1994-09-22 | Method for making a gun barrel with wear resistant internal coating |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5476581A (en) |
| EP (1) | EP0653503B1 (en) |
| JP (1) | JP3058400B2 (en) |
| DE (2) | DE4335139A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19532170C2 (en) * | 1995-08-31 | 1997-09-18 | Ppv Verwaltungs Ag | Process for forming a platinum-containing coating on a substrate and use of the process |
| DE19635404C2 (en) * | 1996-08-31 | 2000-06-21 | Rheinmetall W & M Gmbh | Method and electrode for deburring and / or rounding sharp-edged transitions in smoke extraction bores in gun barrels |
| EP1081252A1 (en) * | 1999-09-02 | 2001-03-07 | Enthone-OMI (Benelux) B.V. | Selective plating method |
| 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 (en) * | 2005-12-22 | 2007-11-13 | Abb Technology Ag | Device and method of metallic coating and use of the device |
| DE102006025244A1 (en) * | 2006-05-29 | 2007-12-06 | Rheinmetall Waffe Munition Gmbh | Protective layer for components of a weapon or the like |
| DE102010020329A1 (en) * | 2010-05-12 | 2011-11-17 | Diehl Stiftung & Co.Kg | Manufacturing process for medical vascular supports |
| DE102012000686A1 (en) | 2012-01-17 | 2013-07-18 | Rheinmetall Waffe Munition Gmbh | Gun barrel with chromed inner profile |
| US9546837B1 (en) * | 2015-10-09 | 2017-01-17 | Bh5773 Ltd | Advanced gun barrel |
| WO2017210709A1 (en) * | 2016-06-09 | 2017-12-14 | Ritter & Stark Gmbh | Configuration assembly of the apparatus for producing the grooves in barrels of firearms by means of a pecm method |
| 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 (6)
| 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 |
| 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 |
| DE2045738A1 (en) * | 1970-09-16 | 1972-03-23 | Mauser Werke AG, 7238 Oberndorf | Gun barrel with partial inner lining |
| FR2520009A1 (en) * | 1982-01-21 | 1983-07-22 | France Etat | PROCESS OF INTERNAL CHROMING OF A TUBULAR ELEMENT, ANODE FOR ITS IMPLEMENTATION AND CHROME ELEMENT OBTAINED ACCORDING TO THIS PROCESS |
| 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 |
-
1993
- 1993-10-15 DE DE4335139A patent/DE4335139A1/en not_active Withdrawn
-
1994
- 1994-09-22 EP EP94114911A patent/EP0653503B1/en not_active Expired - Lifetime
- 1994-09-22 DE DE59402737T patent/DE59402737D1/en not_active Expired - Lifetime
- 1994-10-17 JP JP6250651A patent/JP3058400B2/en not_active Expired - Fee Related
- 1994-10-17 US US08/323,250 patent/US5476581A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5476581A (en) | 1995-12-19 |
| DE59402737D1 (en) | 1997-06-19 |
| EP0653503A1 (en) | 1995-05-17 |
| JPH07167590A (en) | 1995-07-04 |
| DE4335139A1 (en) | 1995-04-20 |
| JP3058400B2 (en) | 2000-07-04 |
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