EP0173094B1 - Plating barrel - Google Patents

Plating barrel Download PDF

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Publication number
EP0173094B1
EP0173094B1 EP85109556A EP85109556A EP0173094B1 EP 0173094 B1 EP0173094 B1 EP 0173094B1 EP 85109556 A EP85109556 A EP 85109556A EP 85109556 A EP85109556 A EP 85109556A EP 0173094 B1 EP0173094 B1 EP 0173094B1
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EP
European Patent Office
Prior art keywords
plating barrel
bar
barrel according
electrically
interior
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EP85109556A
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German (de)
French (fr)
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EP0173094A1 (en
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Frank Maurer
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Individual
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Individual
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Priority to AT85109556T priority Critical patent/ATE37567T1/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/16—Apparatus for electrolytic coating of small objects in bulk
    • C25D17/18—Apparatus for electrolytic coating of small objects in bulk having closed containers
    • C25D17/20—Horizontal barrels

Definitions

  • the invention relates to an electroplating drum with a polygonal plan with a mat wall made of several rectangular wall sections made of electrically non-conductive lamellae, which are connected to one another with their end areas in the joint area formed by two wall sections, with end walls which face the cavity enclosed by the jacket wall seal and with an electrical lead connecting a DC voltage source with a cathode located in the interior of the electroplating drum.
  • the workpiece surfaces of small parts are provided with metallic coatings using electroplating technology.
  • the principle of this method is based on the fact that the metal intended for the coating is deposited on the base material of the part to be coated by means of electric current from the so-called electrolyte solution.
  • the anode which is also in this solution, consists either of the metal to be deposited or of an inert electrode.
  • electroplating drums of the type mentioned are known, for. B. from DE-A-12544178.
  • drums are rotated in a bath containing the electrolytic solution in such a way that all of the small parts inside the drum are moved so that they are directly or indirectly in electrically conductive contact with the anode located in the region of the axis of rotation of the electroplating drum devices.
  • Such drums are very suitable for applying nickel, copper and zinc layers, i. H. of materials with a relatively low electrical resistivity. Due to the very large number of small parts in a drum at the same time, only the at least parts come into direct contact with the cathode when the drum rotates. The majority of parts have contact with the cathode via a more or less long path, which is formed by the contact between the parts. This leads to voltage losses in electrical current transmission, which are greater the poorer the layer deposited on the parts to be coated conducts the electrical current. Chromium is one of the metals with a relatively high electrical resistance, with the result that either the batch of parts to be coated at the same time or the direct current required must be selected to be relatively small in order to avoid excessive voltage drops. A small current leads to a long chrome plating time.
  • the invention has for its object to provide a galvanizing drum of the type mentioned, which is designed so that chrome plating is possible in a shorter time.
  • the invention is accordingly characterized in that at least one electrically conductive lamella is additionally arranged between the non-conductive lamellae, that at least one of the connections, of which the lamella is held in the wall section belonging to it, is designed as an electrical power supply, and that between the power supply and the supply line are electrical contact.
  • This type of design leads from the known contact strips, strips or other contacts located inside the drum to a grid-like cathode arranged on the inner wall of the drum.
  • a disc made of conductive material is advantageously attached to the inside of at least one of the end walls of the electroplating drum the power supply lines and, on the other hand, is connected in an electrically conductive manner to the supply line coming from the direct voltage source via a sliding contact. It is particularly advantageous to use a graphite disc, since an electroplated coating can be washed off particularly easily from graphite.
  • the electrically conductive lamellae with an electrically conductive projection which projects into the interior of the electroplating drum and which advantageously extends over the entire length of these lamellae from one of their end sections to the other. This considerably increases the possibility of direct contacting of the small parts to be coated with the lamellar part acting as an anode.
  • the innermost layer consists of electrically conductive material, while the other ' ren, this layer at least partially covering layers are made of electrically non-conductive material.
  • This inner electrically conductive layer advantageously has the electrically conductive projection protruding into the interior of the electroplating drum.
  • the side of the electrically conductive lamella facing the outside of the electroplating drum is provided with an electrically non-conductive layer.
  • the electroplating drum 10 shown in Fig. 1 has a cylindrical plan. Their side walls consist of flat wall sections 12 which form the shape of a regular hexagon with one another. The two end faces of the electroplating drum 10 are formed by end walls 16, 18.
  • the end wall 16 is designed as a gear so that the drum 10 can be set in rotation about its longitudinal axis L via the ring gear and a gear (not shown) and a drive motor (not shown).
  • a hexagonal shape any other, even irregular, cross-sectional shape with at least three corners can be present.
  • a graphite disc 20 is attached as a cathode on the inner wall thereof.
  • an opening 22 is also provided centrally, through which a supply cable 24 for electrical current from a DC voltage source, not shown, is passed. This line 24 is in pressing contact with the graphite disc 20.
  • the anode (not shown) goes centrally through the end wall 16 with the gear.
  • the wall sections abut in the joint areas 14 at an internal angle of 120 ° or against one another.
  • bolts 42 are attached, which are passed through the end walls 16 and 18, so that the two end walls 16, 18 are pressed parallel to the longitudinal direction L against the wall sections 12 and are fixed in position in this state.
  • the wall sections 12 are formed from lamellae 30, 32 which are rod-shaped and lie with their longitudinal axis on the plane normal to the longitudinal axis L of the electroplating drum.
  • Each of the wall sections 12 is formed from a plurality of lamellae 30, 32, which are aligned normal to the longitudinal axis L and lie close together.
  • the lamellae 30, 32 are so close to one another with their contact surfaces 26 that a dense wall is formed which is only broken through by openings 34 made in the lamellae.
  • a lamella 32 is shown, the one in its two end regions 38 (on its left side in the drawing) with the end region 36 of a lamella 30 and on the other hand (on its right side in the drawing) with the end region 38 one further slat 32 is connected.
  • the lamellae 30, 32 are only half as thick as in their remaining region, so that the entire width of the lamella is constantly thick over the entire length of the lamellae - even in the joint region thereof.
  • the lamellae 30, 32 are connected to one another in their end regions 36, 38 by means of bolts 42 which are passed through recesses 40 in the end regions 36, 38. These bolts run in the joint regions 14 of two wall sections 12 in each case.
  • the bolts 42 have only a very small tolerance in the openings 40 in order to ensure continuous electrical contact between the bolt 42 and the slat end region 36, 38.
  • the middle one shown in FIGS. 2 and 3 lamination 32 comprises three p aralle- le layers 32.1, 32.2 and 32.3.
  • One of the outer layers 32.3 has the openings 34 for the passage of the electrolytic liquid from the interior of the drum 10 into the other bath area surrounding the drum.
  • the innermost layer 32.2 is provided on its side facing the interior of the drum 10 with a projection 50 which extends as a continuous strip from one end region of the lamella 32 to the opposite end region thereof.
  • the projection 50 and the layer 32.2 are made of electrically well-conductive material such as. B. made of stainless steel or titanium.
  • the layers 32.1, 32.3 and a layer 32.4 applied to the side of the inner layer 32.2 facing the outside of the electroplating drum 10, like the other fins 30, consist of electrically non-conductive material such as B. plastic (Fig. 4).
  • the parts to be coated come into contact in the drum with the projection strips 50, which act as cathodes, of various slats 32. It is thereby possible to bring significantly more parts into direct contact with the cathode than would be the case without the electrically conductive fins 32.
  • the projection strips 50 are in electrically conductive contact with one another via the bolts 42.
  • the bolts 42 are in turn on the graphite disc 20 with the DC voltage source in conductive connection.
  • the surface of the pane 20 exposed to contamination can thereby be reduced.
  • any conductive material e.g. As copper, stainless steel or titanium, but especially the aforementioned graphite can be used. The latter is particularly easy to clean from an electroplated coating and is particularly acid-resistant.

Abstract

1. Plating barrel with a polygonal outline having a) an outer walling composed of several rectangular wall sections consisting of electrically nonconducting bars whose end regions are joined together in the abutting region formed by every two wall sections with each other, b) end walls which seal off the cavity surrounded by the outer walling at the end face, c) an electrical supply lead which connects a direct voltage source to a cathode situated in the interior of the plating barrel, characterized d) in that at least one electrically conducting bar (32) is additionally arranged between the nonconducting bars (30), e) in that at least one of the joints which hold the bar (32) in its appropriate wall section (12) is constructed as an electric current supply conductor (42), and f) in that electrical contact exists between the current supply conductor (42) and the supply lead (24).

Description

Die Erfindung betrifft eine Galvanisiertrommel mit mehreckigem Grundriß mit einer Matelwandung aus mehreren, rechteckigen Wandabschnitten aus elektrisch nicht leitenden Lamellen, die mit ihren Endbereichen in dem von jeweils zwei Wandabschnitten miteinander gebildeten Stoßbereich untereinander verbunden sind, mit Abschlußwänden, die den von der Mantelwandung umschlossenen Hohlraum stirnseitig verschließen und mit einer elektrischen Zuleitung, die eine Gleichspannungsquelle mit einer im Innenraum der Galvanisiertrommel befindlichen Kathode verbindet.The invention relates to an electroplating drum with a polygonal plan with a mat wall made of several rectangular wall sections made of electrically non-conductive lamellae, which are connected to one another with their end areas in the joint area formed by two wall sections, with end walls which face the cavity enclosed by the jacket wall seal and with an electrical lead connecting a DC voltage source with a cathode located in the interior of the electroplating drum.

In solchen Galvanisiertrommein werden die Werkstückoberflächen von Kleinteilen mit metallischen Überzügen mit Hilfe der Galvanotechnik versehen.In such electroplating drums, the workpiece surfaces of small parts are provided with metallic coatings using electroplating technology.

Das Prinzip dieses Verfahrens beruht darauf, daß sich das für den Überzug bestimmte Metall mittels elektrischen Stromes aus der sogenannten Elektrolytlösung auf dem Grundwerkstoff des zu beschichtenden Teils niederschlägt.The principle of this method is based on the fact that the metal intended for the coating is deposited on the base material of the part to be coated by means of electric current from the so-called electrolyte solution.

Dieses Teil taucht während der Beschichtung als Kathode in die Elektrolytlösung ein. Die ebenfalls in dieser Lösung sich befindende Anode besteht entweder aus dem abzuscheidenden Metall oder aus einer inerten Elektrode.This part is immersed as a cathode in the electrolyte solution during coating. The anode, which is also in this solution, consists either of the metal to be deposited or of an inert electrode.

Stand der technikState of the art

Bei der Massenbeschichtung von Kleinteilen sind Galvanisiertrommeln der eingangs genannten Art bekannt, z. B. aus der DE-A-12544178.In the bulk coating of small parts, electroplating drums of the type mentioned are known, for. B. from DE-A-12544178.

Diese Trommeln werden in einem die elektrolytische Lösung enthaltenden Bad derart in Rotation versetzt, daß alle der im Inneren der Trommel sich befindenden Kleinteile so durcheinanderbewegt werden, daß sie dabei direkt oder indirekt mit der sich im Bereich der Rotationsachse der Galvanisiertrommel befindenden Anode in elektrisch leitenden Kontakt geraten.These drums are rotated in a bath containing the electrolytic solution in such a way that all of the small parts inside the drum are moved so that they are directly or indirectly in electrically conductive contact with the anode located in the region of the axis of rotation of the electroplating drum devices.

Derartige Trommeln eignen sich sehr gut zum Aufbringen von Nickel-, Kupfer- und Zinkschichten, d. h. von Materialien mit relativ kleinem spezifischen elektrischen Widerstand. Aufgrund der sehr großen Anzahl der in einer Trommel sich gleichzeitig befindenden Kleinteile kommen bei der Rotation der Trommel nur die wenigstens Teile in unmittelbaren direkten Kontakt mit der Kathode. Die überwiegende Zahl von Teilen hat über einen mehr oder weniger langen Weg, der durch die Berührung der Teile untereinander gebildet wird, Kontakt mit der Kathode. Dies führt zu Spannungsverlusten bei der elektrischen Stromübertragung, die umso größer sind, je schlechter die auf den zu beschichtenden Teilen abgeschiedene Schicht den elektrischen Strom leitet. Chrom gehört zu den Metallen mit relativ hohem elektrischen Widerstand mit der Folge, daß entweder die Partie der gleichzeitig zu beschichtenden Teile oder der benötigte Gleichstrom verhältnismäßig klein gewählt werden müssen, um übermäßigen Spannungsabfall zu vermeiden. Ein kleiner Strom führt aber zu einer langen Verchromungsdauer.Such drums are very suitable for applying nickel, copper and zinc layers, i. H. of materials with a relatively low electrical resistivity. Due to the very large number of small parts in a drum at the same time, only the at least parts come into direct contact with the cathode when the drum rotates. The majority of parts have contact with the cathode via a more or less long path, which is formed by the contact between the parts. This leads to voltage losses in electrical current transmission, which are greater the poorer the layer deposited on the parts to be coated conducts the electrical current. Chromium is one of the metals with a relatively high electrical resistance, with the result that either the batch of parts to be coated at the same time or the direct current required must be selected to be relatively small in order to avoid excessive voltage drops. A small current leads to a long chrome plating time.

Darstellung der erfindungRepresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, eine Galvanisiertrommel der eingangs genannten Art anzugeben, die so ausgebildet ist, daß Verchromen in kürzerer Zeit möglich ist.The invention has for its object to provide a galvanizing drum of the type mentioned, which is designed so that chrome plating is possible in a shorter time.

Diese Erfindung ist durch die Merkmale des Hauptanspruches gegeben. Die Erfindung zeichnet sich dementsprechend dadurch aus, daß zwischen den nicht leitenden Lamellen zusätzlich zumindest eine elektrisch leitende Lamelle angeordnet ist, daß mindestens eine der Verbindungen, von denen die Lamelle im dem ihr zugehörenden Wandabschnitt gehalten ist, als elektrische Stromzuführung ausgebildet ist, und daß zwischen der Stromzuführung und der Zuleitung elektrischer Kontakt besteht.This invention is given by the features of the main claim. The invention is accordingly characterized in that at least one electrically conductive lamella is additionally arranged between the non-conductive lamellae, that at least one of the connections, of which the lamella is held in the wall section belonging to it, is designed as an electrical power supply, and that between the power supply and the supply line are electrical contact.

Diese Art der Ausbildung führt von den bekannten, im Inneren der Trommel sich befindenden Kontaktleisten, -bändern oder sonstigen Kontakten hin zu einer an der Innenwand der Trommel angeordneten rasterartigen Kathode.This type of design leads from the known contact strips, strips or other contacts located inside the drum to a grid-like cathode arranged on the inner wall of the drum.

Um den Spannungsanschluß von der außerhalb der Trommel sich befindenden Gleichspannungsquelle zu den in den Stoßbereichen jeweils zweier Wandabschnitte sich befindenden Stromzuführungen konstruktiv zu erleichtern, wird in vorteilhafter Weise an der Innenseite zumindest einer der Abschlußwände der Galvanisiertrommel eine Scheibe aus leitendem Material angebracht, die einerseits direkt mit den Stromzuführungen und andererseits über einen Schleifkontakt mit der von der Gleichspannungsquelle kommenden Zuleitung elektrisch leitend verbunden ist. Von besonderem Vorteil ist es, eine Scheibe aus Graphit zu verwenden, da sich von Graphit ein aufgalvanisierter Belag besonders leicht abwaschen läßt.In order to facilitate the construction of the voltage connection from the DC voltage source located outside the drum to the power supply lines located in the joint areas of two wall sections in each case, a disc made of conductive material is advantageously attached to the inside of at least one of the end walls of the electroplating drum the power supply lines and, on the other hand, is connected in an electrically conductive manner to the supply line coming from the direct voltage source via a sliding contact. It is particularly advantageous to use a graphite disc, since an electroplated coating can be washed off particularly easily from graphite.

Es ist weiterhin möglich, die elektrisch leitenden Lamellen mit einem in den Innenraum der Galvanisiertrommel hineinragenden elektrisch leitenden Versprung zu versehen, der in vorteilhafter Weise über die gesamte Länge dieser Lamellen von einem ihrer Endabschnitte bis zum anderen sich erstreckt. Dadurch vergrößert sich die Möglichkeit der direkten Kontaktierung der zu beschichtenden Kleinteile mit dem als Anode wirkenden Lamellenteil beträchtlich. Abhängig von der Art der Kleinteile kann es auch von Vorteil sein, den Vorsprung gezahnt, z. B. wellenförmig oder gezackt auszuführen, damit die Teile an der Zahnung hängen bleiben und dadurch gut kontaktiert werden.It is also possible to provide the electrically conductive lamellae with an electrically conductive projection which projects into the interior of the electroplating drum and which advantageously extends over the entire length of these lamellae from one of their end sections to the other. This considerably increases the possibility of direct contacting of the small parts to be coated with the lamellar part acting as an anode. Depending on the type of small parts, it may also be advantageous to serrate the projection, e.g. B. wave-shaped or serrated so that the parts get stuck on the teeth and are therefore well contacted.

Um den elektrisch leitenden Teil einer Lamelle von der bei der Beschichtung entstehenden Verunreinigung freizuhalten, hat es sich als besonders vorteilhaft erwiesen, die Lamelle sandwichartig aufzubauen. Die innerste Schicht besteht aus elektrisch leitendem Material, während die ande-' ren, diese Schicht zumindest teilweise bedeckenden Schichten aus elektrisch nicht leitendem Material hergestellt sind. In vorteilhafter Weise besitzt diese innere elektrisch leitende Schicht den in den Innenraum der Galvanisiertrommel ragenden elektrisch leitenden Vorsprung.In order to keep the electrically conductive part of a lamella free from the contamination which occurs during the coating, it has proven to be particularly advantageous to construct the lamella in a sandwich-like manner. The innermost layer consists of electrically conductive material, while the other ' ren, this layer at least partially covering layers are made of electrically non-conductive material. This inner electrically conductive layer advantageously has the electrically conductive projection protruding into the interior of the electroplating drum.

Um die nicht zur Kontaktierung geeignete Oberfläche der elektrisch leitenden Lamelle noch weiter vor Verunreinigungen zu schützen, ist die der Außenseite der Galvanisiertrommel zugewandte Seite der elektrisch leitenden Lamelle mit einer elektrisch nicht leitenden Schicht versehen.In order to further protect the surface of the electrically conductive lamella not suitable for contacting from contamination, the side of the electrically conductive lamella facing the outside of the electroplating drum is provided with an electrically non-conductive layer.

Kurze beschreibung der zeichnungenBrief description of the drawings

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen :

  • Fig. 1 eine schematische, perspektivische Seitenansicht einer Galvanisiertrommel ;
  • Fig. 2 eine Draufsicht auf eine in einem Wandbereich sich befindende Lamelle ;
  • Fig. 3 eine Schnittdarstellung gemäß Schnitt 3-3 in Fig. 2 und
  • Fig. 4 einen Schnitt durch eine Art von erfindungsgemäßer Lamelle gemäß Schnitt 4-4 in Fig. 2.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it :
  • Fig. 1 is a schematic, perspective side view of an electroplating drum;
  • 2 shows a plan view of a lamella located in a wall area;
  • Fig. 3 is a sectional view according to section 3-3 in Fig. 2 and
  • 4 shows a section through a type of lamella according to the invention in accordance with section 4-4 in FIG. 2.

Wege zum ausführen der erfindungWays of carrying out the invention

Die in Fig. 1 dargestellte Galvanisiertrommel 10 besitzt einen zylindrischen Grundriß. Ihre Seitenwände bestehen aus ebenen Wandabschnitten 12, die untereinander die Form eines regelmäßigen Sechseckes bilden. Die beiden Stirnseiten der Galvanisiertrommel 10 werden durch Abschlußwände 16, 18 gebildet. Die Abschlußwand 16 ist als Zahnrad ausgebildet, so daß die Trommel 10 über den Zahnkranz und über ein nicht dargestelltes Getriebe und einen nicht dargestellten Antriebsmotor um ihre Längsachse L in Rotation versetzt werden kann. Statt Sechseckform kann jede andere, auch unregelmäßige Querschnittsform mit mindestens drei Ecken vorliegen.The electroplating drum 10 shown in Fig. 1 has a cylindrical plan. Their side walls consist of flat wall sections 12 which form the shape of a regular hexagon with one another. The two end faces of the electroplating drum 10 are formed by end walls 16, 18. The end wall 16 is designed as a gear so that the drum 10 can be set in rotation about its longitudinal axis L via the ring gear and a gear (not shown) and a drive motor (not shown). Instead of a hexagonal shape, any other, even irregular, cross-sectional shape with at least three corners can be present.

Auf der anderen Abschlußwand 18 ist auf der Innenwand derselben eine Graphitscheibe 20 als Kathode befestigt. In der Abschlußwand 18 ist weiterhin zentrisch eine Öffnung 22 angebracht, durch die ein Zuleitungskabel 24 für elektrischen Strom von einer nicht dargestellten Gleichspannungsquelle hindurchgeführt ist. Diese Leitung 24 steht in drückendem Kontakt mit der Graphitscheibe 20. Die (nicht dargestellte) Anode geht mittig durch die Abschlußwand 16 mit dem Zahnrad.On the other end wall 18, a graphite disc 20 is attached as a cathode on the inner wall thereof. In the end wall 18, an opening 22 is also provided centrally, through which a supply cable 24 for electrical current from a DC voltage source, not shown, is passed. This line 24 is in pressing contact with the graphite disc 20. The anode (not shown) goes centrally through the end wall 16 with the gear.

Durch die sechseckige Grundrißform der Galvanisiertrommel 10 stoßen die Wandabschnitte in den Stoßbereichen 14 unter einem Innen winkel von 120° bzw. aneinander. In diesen Stoßbereichen 14 sind Bolzen 42 angebracht, die durch die Abschlußwände 16 und 18 hindurchgeführt sind, so daß die beiden Abschlußwände 16, 18 parallel zur Längsrichtung L gegen die Wandabschnitte 12 gepreßt und in diesem Zustand lagemäßig fixiert werden.Due to the hexagonal plan shape of the electroplating drum 10, the wall sections abut in the joint areas 14 at an internal angle of 120 ° or against one another. In these joint areas 14, bolts 42 are attached, which are passed through the end walls 16 and 18, so that the two end walls 16, 18 are pressed parallel to the longitudinal direction L against the wall sections 12 and are fixed in position in this state.

Die Wandabschnitte 12 werden aus Lamellen 30, 32 gebildet, die stabartig ausgebildet sind und mit ihrer Längsachse auf der auf der Längsachse L der Galvanisiertrommel normalen Ebene liegen.The wall sections 12 are formed from lamellae 30, 32 which are rod-shaped and lie with their longitudinal axis on the plane normal to the longitudinal axis L of the electroplating drum.

Jeder der Wandabschnitte 12 ist aus mehreren, normal zur Längsachse L ausgerichteten, dicht aneinanderliegenden Lamellen 30, 32 gebildet. Die Lamellen 30, 32 liegen mit ihren Kontaktflächen 26 so dicht aneinander, daß eine dichte Wandung entsteht, die nur durch in den Lamellen angebrachte Öffnungen 34 durchbrochen wird.Each of the wall sections 12 is formed from a plurality of lamellae 30, 32, which are aligned normal to the longitudinal axis L and lie close together. The lamellae 30, 32 are so close to one another with their contact surfaces 26 that a dense wall is formed which is only broken through by openings 34 made in the lamellae.

In Fig. 2 ist eine Lamelle 32 dargestellt, die in ihren beiden Endbereichen 38 einmal (auf ihrer in der Zeichnung linken Seite) mit dem Endbereich 36 einer Lamelle 30 und zum anderen (auf ihrer in der Zeichnung rechten Seite) mit dem Endbereich 38 einer weiteren Lamelle 32 verbunden ist. In den Endbereichen 36, 38 sind die Lamellen 30, 32 nur halb so dick wie in ihrem übrigen Bereich, so daß die gesamte Breite der Lamelle über die gesamte Länge der Lamellen - auch im Stoßbereich derselben - konstant dick ist. Die Verbindung der Lamellen 30, 32 untereinander geschieht in ihren Endbereichen 36, 38 mittels Bolzen 42, die durch Ausparungen 40 in den Endbereichen 36, 38 hindurchgeführt sind. Diese Bolzen verlaufen in den Stoßbereichen 14 jeweils zweier Wandabschnitte 12. Die Bolzen 42 haben in den Öffnungen 40 nur eine sehr geringe Toleranz zwecks Sicherstellung eines durchgehenden elektrischen Kontaktes zwischen Bolzen 42 und Lamellenendbereich 36, 38. Die in den Fig. 2 und 3 dargestellte mittlere Lamelle 32 weist drei paralle- le Schichten 32.1, 32.2 und 32.3 auf. Die eine der äußeren Schichten 32.3 besitzt die Öffnungen 34 zum Durchtritt der elektrolytischen Flüssigkeit vom Innenraum der Trommel 10 in den die Trommel umgebenden übrigen Badbereich. Die innerste Schicht 32.2 ist an ihrer im Innenraum der Trommel 10 zugewandten Seite mit einem Vorsprung 50 versehen, der als durchgehende Leiste von einem Endbereich der Lamelle 32 zum gegenüberliegenden Endbereich derselben sich erstreckt. Der Vorsprung 50 und die Schicht 32.2 sind aus elektrisch gut leitendem Material wie z. B. aus Edelstahl oder aus Titan hergestellt. Um die Schicht 32.2 von Verunreinigungen beim Beschichten freizuhalten, sind deren Seitenflächen von den äußeren Schichten 32.1 und 32.3 bedeckt. Die Schichten 32.1, 32.3 und eine auf der der Außenseite der Galvanisiertrommel 10 zugewandten Seite der inneren Schicht 32.2 aufgebrachte Schicht 32.4 bestehen wie die übrigen Lamellen 30 aus elektrisch nicht leitendem Material wie z. B. Kunststoff (Fig. 4).In Fig. 2, a lamella 32 is shown, the one in its two end regions 38 (on its left side in the drawing) with the end region 36 of a lamella 30 and on the other hand (on its right side in the drawing) with the end region 38 one further slat 32 is connected. In the end regions 36, 38, the lamellae 30, 32 are only half as thick as in their remaining region, so that the entire width of the lamella is constantly thick over the entire length of the lamellae - even in the joint region thereof. The lamellae 30, 32 are connected to one another in their end regions 36, 38 by means of bolts 42 which are passed through recesses 40 in the end regions 36, 38. These bolts run in the joint regions 14 of two wall sections 12 in each case. The bolts 42 have only a very small tolerance in the openings 40 in order to ensure continuous electrical contact between the bolt 42 and the slat end region 36, 38. The middle one shown in FIGS. 2 and 3 lamination 32 comprises three p aralle- le layers 32.1, 32.2 and 32.3. One of the outer layers 32.3 has the openings 34 for the passage of the electrolytic liquid from the interior of the drum 10 into the other bath area surrounding the drum. The innermost layer 32.2 is provided on its side facing the interior of the drum 10 with a projection 50 which extends as a continuous strip from one end region of the lamella 32 to the opposite end region thereof. The projection 50 and the layer 32.2 are made of electrically well-conductive material such as. B. made of stainless steel or titanium. In order to keep the layer 32.2 free of contaminants during the coating, the side surfaces thereof are covered by the outer layers 32.1 and 32.3. The layers 32.1, 32.3 and a layer 32.4 applied to the side of the inner layer 32.2 facing the outside of the electroplating drum 10, like the other fins 30, consist of electrically non-conductive material such as B. plastic (Fig. 4).

Die zu beschichtenden Teile kommen in der Trommel mit den als Kathode wirkenden Vorsprungsleisten 50 verschiedener Lamellen 32 in Berührung. Es ist dadurch möglich, wesentlich mehr Teile in direkten Kontakt mit der Kathode zu bringen, als es ohne die elektrisch leitenden Lamellen 32 der Fall wäre. Die Vorsprungsleisten 50 stehen über die Bolzen 42 in elektrisch leitendem Kontakt miteinander. Die Bolzen 42 stehen wiederum über die Graphitscheibe 20 mit der Gleichspannungsquelle in leitender Verbindung. Es ist in diesem Zusammenhangauch möglich, statt der Kontaktscheibe 20 einen Kontaktring zu verwenden, der im Bereich der Bolzen 42 auf zumindest einer der Abschlußwände 16, 18 befestigt und mit dem Zuleitungskabel 24 elektrisch leitend kontaktiert ist. Die der Verunreinigung ausgesetzte Oberfläche der Scheibe 20 kann dadurch verringert werden. Für den Ring oder die Scheibe kann jedes leitfähige Material, z. B. Kupfer, Edelstahl oder Titan, insbesondere aber der erwähnte Graphit verwendet werden. Letzterer läßt sich von einem aufgalvanisierten Belag besonders leicht reinigen, und er ist besonders säurefest.The parts to be coated come into contact in the drum with the projection strips 50, which act as cathodes, of various slats 32. It is thereby possible to bring significantly more parts into direct contact with the cathode than would be the case without the electrically conductive fins 32. The projection strips 50 are in electrically conductive contact with one another via the bolts 42. The bolts 42 are in turn on the graphite disc 20 with the DC voltage source in conductive connection. In this context, it is also possible to use a contact ring instead of the contact disk 20, which is fastened in the region of the bolts 42 on at least one of the end walls 16, 18 and is electrically conductively contacted with the supply cable 24. The surface of the pane 20 exposed to contamination can thereby be reduced. For the ring or disc, any conductive material, e.g. As copper, stainless steel or titanium, but especially the aforementioned graphite can be used. The latter is particularly easy to clean from an electroplated coating and is particularly acid-resistant.

Claims (11)

1. Plating barrel with a polygonal outline having
a) an outer walling composed of several rectangular wall sections consisting of electrically nonconducting bars whose end regions are joined together in the abutting region formed by every two wall sections with each other,
b) end walls which seal off the cavity surrounded by the outer walling at the end face,
c) an electrical supply lead which connects a direct voltage source to a cathode situated in the interior of the plating barrel, characterized
d) in that at least one electrically conducting bar (32) is additionally arranged between the nonconducting bars (30),
e) in that at least one of the joints which hold the bar (32) in its appropriate wall section (12) is constructed as an electric current supply conductor (42), and
f) in that electrical contact exists between the current supply conductor (42) and the supply lead (24).
2. Plating barrel according to Claim 1, characterized in that the current supply conductors (42) are in touching contact with a conducting disc
(20) which is mounted in its turn on the inside of at least one of the end walls (16, 18) of the plating barrel (10), and in that said disc (20) makes electrical contact with the supply lead (24).
3. Plating barrel according to Claim 2, characterized in that the conducting disc (20) consists of graphite.
4. Plating barrel according to Claim 1, characterized in that the electrically conducting bar (32) consists of a bar (30) which is equipped with an electrically conducting layer on the side facing the interior of the plating barrel (10).
5. Plating barrel according to Claim 4, characterized in that the conducting bar (32) has an electrically conducting projection (50) projecting into the interior of the plating barrel (10).
6. Plating barrel according to Claim 5, characterized in that the projection (50) extends linearly from one end section (38) of the bar (32) to its other end section (38).
7. Plating barrel according to Claim 5, characterized in that the projection is toothed.
8. Plating barrel according to Claim 1, characterized in that the bar (32) is of sandwich-type construction such that the innermost layer (32.2) consists at least partially of electrically conducting material, while the other layers (32.1, 32.3), which at least partially cover said layer (32.2), consist of electrically non-conducting material.
9. Plating barrel according to Claim 7, characterized in that the inner layer (32.2) of the bar (32) has the electrically conducting projection (50) projecting into the interior of the plating barrel (10).
10. Plating barrel according to Claim 9, characterized in that the side of the inner layer (32.2) facing the outside of the plating barrel (10) is covered with an electrically nonconducting layer (32.4).
EP85109556A 1984-08-07 1985-07-30 Plating barrel Expired EP0173094B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85109556T ATE37567T1 (en) 1984-08-07 1985-07-30 GALVANIZED DRUM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843429011 DE3429011A1 (en) 1984-08-07 1984-08-07 GALVANIZED DRUM
DE3429011 1984-08-07

Publications (2)

Publication Number Publication Date
EP0173094A1 EP0173094A1 (en) 1986-03-05
EP0173094B1 true EP0173094B1 (en) 1988-09-28

Family

ID=6242488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109556A Expired EP0173094B1 (en) 1984-08-07 1985-07-30 Plating barrel

Country Status (3)

Country Link
EP (1) EP0173094B1 (en)
AT (1) ATE37567T1 (en)
DE (2) DE3429011A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1173631B1 (en) 1999-04-28 2003-02-19 RICHARD TSCHERWITSCHKE GMBH Kunststoff-Apparatebau und Ablufttechnik Electroplating barrel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1119623B (en) * 1959-02-12 1961-12-14 Linnhoff Ohg Wilhelm Drum plating machine
NL269246A (en) * 1961-04-14
FR1454498A (en) * 1965-08-25 1966-02-11 Commissariat Energie Atomique Surface treatment process and device for carrying out said process or a similar process
DE2544178A1 (en) * 1975-10-03 1977-04-14 Linnhoff Ohg Wilhelm Plastic drum for surface treatment of small parts - assembled from small polythene plates, and able to hold heavy charge

Also Published As

Publication number Publication date
EP0173094A1 (en) 1986-03-05
DE3429011A1 (en) 1986-02-20
ATE37567T1 (en) 1988-10-15
DE3565291D1 (en) 1988-11-03

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