DE744590C - Hanging device for electrolytic hard chrome plating of several cylindrical workpieces arranged one above the other inside and / or outside with a chrome metal layer to be provided - Google Patents

Hanging device for electrolytic hard chrome plating of several cylindrical workpieces arranged one above the other inside and / or outside with a chrome metal layer to be provided

Info

Publication number
DE744590C
DE744590C DEJ66395D DEJ0066395D DE744590C DE 744590 C DE744590 C DE 744590C DE J66395 D DEJ66395 D DE J66395D DE J0066395 D DEJ0066395 D DE J0066395D DE 744590 C DE744590 C DE 744590C
Authority
DE
Germany
Prior art keywords
workpieces
chrome
metal layer
chrome plating
outside
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
Application number
DEJ66395D
Other languages
German (de)
Inventor
Wilhelm Krell
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.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm 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
Priority to BE455028D priority Critical patent/BE455028A/xx
Application filed by Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Priority to DEJ66395D priority patent/DE744590C/en
Application granted granted Critical
Publication of DE744590C publication Critical patent/DE744590C/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06Suspending or supporting devices for articles to be coated
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00Electroplating characterised by the article coated
    • C25D7/04Tubes; Rings; Hollow bodies

Description

Einhängevorrichtung zur elektrolytischen Hartverchromung mehrerer übereinander angeordneter innen und/oder außen mit einer Chrommetallschicht zu vesehender zylindrischer Werkstücke Die Erfindung betrifft eine Einhängevorrichtung zur elektrolytischen Hartverchromung mehrerer übereinander angeordneter, innen und/oder außen mit einer Chrommetallschicht zu versehender zylindrischer Werkstücke, insbesondere von Panzerbüchsen für Brennkraftmaschinen unter Benutrlmg hofier Stromdichten. -Es hat sich gezeigt, daß es sehr schwierig oder sogar unmöglich ist, gleichzeitig auf mehrere Panzerbüchsen für Brennkraftmaschinen eine äußerst gleichmäßige Hartchromschicht elektrolytisch niederzuschlagen, wenn der Stromübergang nicht an allen Stellen des zu verchromenden Stückes annähernd gleich ist.- Dies ist beispielsweise dann der Fall, wenn die Anode nicht von allen Stellen des Stückes gleich weit entfernt ist oder wenn der Stromdurchgang durch das Chrombad ungleichmäßig erfolgt, z. B. am Anfang der Anode stärker als an ihrem Ende ist.Suspension device for electrolytic hard chrome plating of several one above the other arranged inside and / or outside to be provided with a chrome metal layer cylindrical workpieces The invention relates to a suspension device for electrolytic Hard chrome plating of several superimposed, inside and / or outside with one Chrome metal layer of cylindrical workpieces to be provided, in particular of armored rifles for internal combustion engines using high current densities. -It has shown, that it is very difficult or even impossible to hit several anti-tank rifles at the same time for internal combustion engines an extremely uniform hard chrome layer electrolytically knock down if the current junction does not have to be chrome-plated at all points Piece is approximately the same.- This is the case, for example, when the anode is not equidistant from all points of the piece or if the electrical continuity takes place unevenly through the chrome bath, z. B. stronger than at the beginning of the anode is at its end.

Es ist bereits bekannt, dib gleichmäßige Stromzu- und -abführung beim Galvanisieren von Hohlkörpern, z. B. bei der Verchromung von Rohren, dadurch zu erreichen, daß den zu behandelten Werkstücken entweder biegsame, axial: -aausgexichtete Anoden zugeordnet oder innerhalb des Werkstückes mittig geführte Wanderanoden benutzt werden. Ferner ist bereits vorgeschlagen worden, die Stromzuführung beim elektrolytischen Verchromen rohrförmiger Werkstücke durch zusätzliche Anordnung mehrerer aus dünnten Kupferdränten bestehender Stromzuleitungen: zu verbessern. So ist es z. B. üblich, um so mehr Stromzuleitungen und Kontakte zu schaffen, je größer der Durchmesser des Werkstückes, also je größer die zu verchromende Fläche ist und je kleiner seine Wandstärke ist, wobei die Hilfskontakte in Zeitabständen auf den Werkstücken verschoben werden müssen, damit überall auf den Werkstücken ein möglichst gleichmäßiger Chromniederschlag erreicht wird.It is already known that the current supply and discharge is even Electroplating of hollow bodies, e.g. B. in the chrome plating of pipes, thereby too achieve that the workpieces to be treated are either flexible, axially: -aausgexierter Assigned to anodes or used centrally guided traveling anodes within the workpiece will. Furthermore, it has already been proposed that the power supply in the electrolytic Chrome plating of tubular workpieces by additionally arranging several thin ones Copper wires existing power lines: to be improved. So is it z. B. common to create the more power lines and contacts, the larger the diameter of the workpiece, i.e. the larger the area to be chrome-plated and the smaller its wall thickness, the auxiliary contacts at time intervals on the Workpieces have to be moved so that a possible anywhere on the workpieces uniform chromium deposit is achieved.

Derartige Maßnahmen können allenfalls bei der dekorativen Verchromung angewandt werden, bei der Hartverchromung von Panzerbüchsen für Brennkraftinaschinen führen sie jedoch keinesfalls zu dem gewünschten Erfolg, da bei Verwendung hoher Stromdichten unter anderem die zuverlässige Kontaktgabevon ausschlaggebender Bedeutung ist.Such measures can only be used for decorative chrome plating are used in the hard chrome plating of armored rifles for internal combustion engines however, they in no way lead to the desired success, since higher values are used when using them Current densities, among other things, the reliable contact is of crucial importance is.

Ein einwandfreier, im elektrolytischen Bade auf mehrere Panzerbüchsen für Brennkraftmaschinen gleichzeitig aufzubringender Hartchromitberzug wird erst durch die Benutzung einer Vorrichtung gemäß vorliegender Erfindung möglich; bei der die an isolierter Kathodenstäben hängenden Werkstücke an den freien Enden mit an sich bekannten Blendringen abgedeckt und mit axial auf den Kathodenstäben einstellbaren Kontaktringen verbunden sind, wobei die Kathodenstäbe mit um die Werkstücke herum achsenparallel verlaufenden, zu g- und druckspannungsfrei angeordneten starren Anoden in einer Festhaltevorrichtung zu einem gemeinsamen Gebilde zusammengefaßt sind. Für die Verchromung der Innenfläche der Werkstücke ist dabei zweckmäßig eine längs der Mittellinie derselben verlauf ende Innenanode vorgesehen, während der Außenfläche der Werkstücke zwei oder mehrere an deren Umfang angeordnete Anoden zugewiesen sind. Der Abstand der Außenanoden vom Werkstück ist vorteilhaft unter' Berücksichtigung der Betriebserfordernisse dem Abstand der Innenanode von den Werkstücken angepaßt.A perfect one, in the electrolytic bath on several anti-tank rifles for internal combustion engines at the same time to be applied hard chromite coating is only possible through the use of a device according to the present invention; at the workpieces hanging on insulated cathode rods at the free ends known cover rings and covered with axially adjustable on the cathode rods Contact rings are connected, the cathode rods with around the workpieces axially parallel, rigid anodes arranged to be free of g and compressive stress are combined in a retaining device to form a common structure. For the chrome-plating of the inner surface of the workpieces, a longitudinal one is expedient the center line of the same extending inner anode is provided while the outer surface the workpieces are assigned two or more anodes arranged on their circumference. The distance between the external anodes and the workpiece is advantageous under consideration the operating requirements are adapted to the distance between the inner anode and the workpieces.

In der Zeichnung ist die Vorrichtung gemäß der Erfindung dargestellt. Sie besteht in der Hauptsache aus mehreren Außenanoden 1, z, 3, aus als Schienen dienenden Kathoden 4, 5 sowie einer Innenanode 6, die sämtlich achsparallel zueinander angeordnet und zu einem einheitlichen, an sich starren Gebilde durch Verschraubung bei Zwischenlage von Isolierkörpern 14. 15, 16 zusammengefaßt sind. In diese Vorrichtung sind drei Werkstucke 7. R, 9 mittig ausgerichtet eingebracht. Die Festlegung der Werkstücke erfolgt zwischen auf den als Schienen dienenden Kathoden 4, 5 axial einstellbaren Ringscheiben io, ii, wobei die freien Enden der Werkstücke in an sich bekannter Weise durch Blendringe 12, 13 abgedeckt sind. Die Außenanode 3 ist an ihrem unteren Ende rechtwinklig abgebogen und mit der Innenanode 6 stromleitend verbunden, wodurch ein unzulässiger Spannungsabfall in der Anode vermieden und gleichzeitig eine genaue Ausmittung der Anode 6 erreicht wird.In the drawing, the device according to the invention is shown. It consists mainly of several external anodes 1, z, 3, as rails serving cathodes 4, 5 and an inner anode 6, all of which are axially parallel to one another arranged and to a uniform, rigid structure by screwing with the interposition of insulating bodies 14, 15, 16 are combined. In this device three workpieces 7. R, 9 are brought in centrally aligned. Establishing the Workpieces are carried out between the cathodes 4, 5 which are axially adjustable on the rails Ring disks io, ii, the free ends of the workpieces in per se known Way by cover rings 12, 13 are covered. The outer anode 3 is at its lower End bent at right angles and electrically connected to the inner anode 6, whereby an impermissible voltage drop in the anode is avoided and at the same time an accurate one Emission of the anode 6 is achieved.

Claims (3)

PATENTANSPRUCH: Einhä ngevorrichtung zur elektrolytischen Hartverchromung mehrerer übereinander angeordneter, innen und/oder außen mit einer Chrommetallschicht zu versehender zylindrischer Werkstücke, insbesondere von Panzerbüchsen für Brennkraftmaschinen unter Benutzung hoher Stromdichten, dadurch gekennzeichnet, daß die an isolierten Kathodens iiben (4,5) hängenden Werkstücke (7, B. ü 9) an den freien 7 Enden mit an sich bekannten Blendringen (1z,13) abgedeckt und mit axial auf den Kathodenstäben (4, 5) einstellbaren Kontaktringen (io, i i) verbunden sd;nd und daß die Kathodenstäbe (4., 5) mit um die Werkstücke herum achsenparallel verlaufenden, zug-und druckspannungsfrei angeordneten starren Anoden (1, z, 3) in einer Festhaltevorrichtung zu einem gemeinsamen Gebilde zusamtnengefaßt sind. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik sind im Erteilungsverfahren folgende Druckschriften in Betracht gezogen worden: deutsche Patentschrift .... \Tr. 472 937; USA.- 1 872 290; Pfanliauser, Verchromungstechnik, PATENT CLAIM: Hanging device for electrolytic hard chrome plating of several cylindrical workpieces arranged on top of one another, inside and / or outside to be provided with a chrome metal layer, in particular armored rifles for internal combustion engines using high current densities, characterized in that the workpieces hanging on insulated cathodes (4, 5) (7, B. ü 9) covered at the free 7 ends with per se known cover rings (1z, 13) and connected to axially adjustable contact rings (io, ii) on the cathode rods (4, 5) and that the cathode rods (4, 5) with rigid anodes (1, z, 3) which run parallel to the axis around the workpieces and are arranged free of tension and compressive stresses in a retaining device to form a common structure. To distinguish the subject of the application from the state of the art, the following publications were considered in the granting procedure: German patent specification .... \ Tr. 472,937; USA.- 1 872 29 0; Pfanliauser, chrome plating technology, 2. Auf1. 193 1, S. i 18, 4. Abs., und S.179. 2nd on1. 193 1, p. I 18, 4th paragraph, and p.179. 3. Abs.3. Para.
DEJ66395D 1940-01-31 1940-01-31 Hanging device for electrolytic hard chrome plating of several cylindrical workpieces arranged one above the other inside and / or outside with a chrome metal layer to be provided Expired DE744590C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE455028D BE455028A (en) 1940-01-31
DEJ66395D DE744590C (en) 1940-01-31 1940-01-31 Hanging device for electrolytic hard chrome plating of several cylindrical workpieces arranged one above the other inside and / or outside with a chrome metal layer to be provided

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEJ66395D DE744590C (en) 1940-01-31 1940-01-31 Hanging device for electrolytic hard chrome plating of several cylindrical workpieces arranged one above the other inside and / or outside with a chrome metal layer to be provided

Publications (1)

Publication Number Publication Date
DE744590C true DE744590C (en) 1944-01-20

Family

ID=7207901

Family Applications (1)

Application Number Title Priority Date Filing Date
DEJ66395D Expired DE744590C (en) 1940-01-31 1940-01-31 Hanging device for electrolytic hard chrome plating of several cylindrical workpieces arranged one above the other inside and / or outside with a chrome metal layer to be provided

Country Status (2)

Country Link
BE (1) BE455028A (en)
DE (1) DE744590C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE959776C (en) * 1953-07-08 1957-03-14 Wolfram Ruff Dr Ing Arrangement for hard chrome plating of light metal engine cylinders
DE1007128B (en) * 1952-03-21 1957-04-25 John William Howlett Chrome-plated piston ring with a circumferential groove and process for its manufacture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE472937C (en) * 1927-04-22 1929-03-08 Stone & Co Ltd J Device for electrolytic inner lining of metal pipes
US1872290A (en) * 1928-06-23 1932-08-16 Westinghouse Electric & Mfg Co Corrugated or threaded anode

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE472937C (en) * 1927-04-22 1929-03-08 Stone & Co Ltd J Device for electrolytic inner lining of metal pipes
US1872290A (en) * 1928-06-23 1932-08-16 Westinghouse Electric & Mfg Co Corrugated or threaded anode

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1007128B (en) * 1952-03-21 1957-04-25 John William Howlett Chrome-plated piston ring with a circumferential groove and process for its manufacture
DE959776C (en) * 1953-07-08 1957-03-14 Wolfram Ruff Dr Ing Arrangement for hard chrome plating of light metal engine cylinders

Also Published As

Publication number Publication date
BE455028A (en)

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