DE10308731B4 - Method and device for galvanic coating of hollow bodies - Google Patents

Abstract

Process for the electroplating of a
- on a frame (8)
- electrically isolated,
- horizontally rotatable
- fortified,
- Having at least one undercut and
- in an electrolyte (4) immersed hollow body (10),
which is set on the occasion of the electroplating process in a rotation about a horizontal axis (14),
wherein at least one anode (22) protrudes through an opening (18) located in the hollow body (10) into its interior space (20),
characterized,
In that a tube or inserted tube (28) partially inserted into the hollow body (10) through the opening (18) is automatically completely filled with electrolyte liquid (4) during the immersion of the hollow body (10) into the bath (4, 6). fills, and
- That the outer end (opening, 32) of the tube / pipe (28) when lifting the hollow body (10) from the electrolyte (4) due to gravity below the level of the inside of the hollow body (10) located end (the. ..

Description

The The invention relates to a process for the galvanic coating of hollow with and without undercut and a device for performing this Process.

to execution such a generic method has the device described in DE-PS 35 19 906 C1 galvanic bath on. To even with hollow bodies with undercut inside a uniform wetting and thus even galvanic To achieve coating is to change the position of a hollow body after the Immersion in an electrolyte remaining gas bubble a movement of the hollow body to be plated required. According to DE-PS 35 19 9061 are immersed in a galvanic bath and there to be galvanized hollow body vertically mounted in a frame and in the immersed state Pivoted or rotated about a horizontal axis.

Regarding the anode lead is in this type suspension either the installation of sliding contacts required or you limited itself with loose cable feed on a float (swing motion).

There the hollow body Undercuts, is a complete pouring (emptying) after the plating process is not possible, so that the remaining liquid - in particular special with several, consecutive, mutually incompatible Galvanizing baths - steamed and the hollow body must be dried.

Of the Invention is based on the object, a method of the initially to create a way of avoiding these abuses easy way allows becomes.

• – an einem Gestell
• – elektrisch isoliert,
• – horizontal drehbar
• – befestigten,
• – mindestens einen Hinterschnitt aufweisenden und
• – in einen Elektrolyten getauchten Hohlkörpers, der anlässlich des Galvanisierprozesses in eine Rotation um eine horizontale Achse versetzt wird, wobei mindestens eine Anode durch eine in dem Hohlkörper befindliche Öffnung in dessen Innenraum hineinragt, dadurch gekennzeichnet,
• – dass sich ein durch die Öffnung teilweise in den Hohlkörper eingeführter Schlauch oder eingeführtes Rohr während des Eintauchens des Hohlkörpers in das Bad selbsttätig vollständig mit Elektrolyt-Flüssigkeit füllt, und
• – dass das äußere Ende mit einer zweiten Öffnung des Schlauchs/des Rohres beim Herausheben des Hohlkörpers aus dem Elektrolyten infolge der Schwerkraft unter das Niveau des im Innern des Hohlkörpers befindlichen Endes des Schlauches/Rohres mit einer ersten Öffnung sinkt, wodurch der beim Herausheben aus dem Elektrolyten im Innenraum des Hohlkörpers sonst aufgrund von Hinterschneidungen zurückbleibende Flüssigkeitsrest vollständig durch den Schlauch/das Rohr abläuft.

This object is achieved in that a method is provided for the galvanic coating of a

• - on a frame
• - electrically isolated,
• - horizontally rotatable
• - fortified,
• - Having at least one undercut and
• - immersed in an electrolyte hollow body which is placed on the occasion of the electroplating process in a rotation about a horizontal axis, wherein at least one anode protrudes through an opening located in the hollow body in the interior thereof, characterized
• - That an inserted through the opening partially into the hollow body tube or inserted tube automatically fills completely during the immersion of the hollow body in the bath with electrolyte liquid, and
• - That the outer end with a second opening of the tube / tube when lifting the hollow body of the electrolyte due to gravity below the level of located in the interior of the hollow body end of the tube / tube with a first opening decreases, whereby the lifting out of the Electrolyte in the interior of the hollow body otherwise due to undercuts remaining residual fluid completely through the hose / tube expires.

preferred Details of the method according to the invention and a corresponding arrangement will become apparent from the other claims.

by virtue of an end swimmer is the highest point of the partial outside the Hollow body, but inside the galvanic bath hose located its floated outer end, while the other end of the hose inside the hollow body whose lowest point is located. The hose is so short that no intermediate maxima are present. Thus, can themselves Do not set any air bubbles in the hose when it is full. At the Lifting out the hollow body out of the bath takes the floated outer end the hose the lowest point. The hose runs empty and thereby takes the remaining, located at the lowest point of the hollow body liquid With. Therefore, a separate drying process can be dispensed with become.

There the opening of the hollow body Aligned horizontally when immersed in the plating bath is a gradual To fill. A sudden in shooting the liquid, as when dipping a hollow body with vertically upward opening, is avoided, d. h., it does not inject any electrolyte liquid into the environment. Liquid goes not lost and therefore does not need to be refilled.

There the axis of rotation with the longitudinal axis of the hollow body identical that can be in the hollow body protruding anode be rigidly attached to the frame. A turning the anode - as at vertically arranged hollow bodies - is not required.

The anode can be mounted on a simple pivot bearing, which makes it before galvanizing into the hollow body into and out again after galvanizing. As a result, the assembly effort for the preparation of the electroplating process is considerably simplified.

Of the Hose can at least partially consist of a rigid tube, only that to the lowest point within the hollow tube directed tail is designed as a flexible hose, so inadvertent touches no damages the surface of the hollow body occur.

A Simplification is also achieved when the anode is a hollow tube is formed, to the the inner end of the drain hose is flanged. Since thus the drain hose at the anode fixed, he is not a separate part, what the assembly and disassembly of the (at least one) hollow body considerably simplified on the frame.

Preferably represents the at the bottom of the hollow body located pin which serves as a cathode counter electrode.

Compared with the nearest booth The technique is a less expensive in the inventive arrangement Frame required. Since in the inventive solution only the hollow body to their horizontal axis are rotated and not the whole Frame in the electrolyte must be swung back and forth, the Volume of the plating bath on those with the size of the to be plated hollow body specified minimum size are limited.

Based The drawing below two embodiments of the invention explained in more detail. It shows:

1 the schematic diagram of a first embodiment of an inventive arrangement together with a hollow body to be coated in longitudinal section, namely:

1a in position during electroplating and 1b lifted out of the electrolyte;

2 the schematic diagram with respect to the anode to be used of a second embodiment.

The in the 1a schematically illustrated arrangement 2 for the production of a galvanic coating consists of a galvanic liquid 4 filled containers 6 (galvanic bath). In this galvanic bath 4 . 6 is a frame 8th submersible and removable again. To the frame 8th is a hollow body to be galvanized 10 by means of a pin 12 around its longitudinal axis 14 in a pivot bearing 16 attached rotatable and electrically insulated. The insulation can be realized by the pivot bearing 16 , the cone 12 and / or the frame 8th is electrically insulated (are).

The hollow body 10 is on the pin 12 so fastened that its opening 18 is directed laterally. In the interior 20 of the hollow body 10 sticks out as an anode 22 polarized electrode inside. During electroplating, the electrolyte gets into the electrolyte 4 dipped hollow body 10 over the cone 12 around its longitudinal axis 14 rotated in turns. The electrode rotates 22 not with.

Regardless of whether during filling a possibly present in the hollow body gas bubble 24 stops above, becomes the inner surface 26 of the hollow body 10 through the revolutions of the inside 20 located electrolyte fluid 4 completely wetted.

Except the electrode 22 protrudes into the interior 20 of the hollow body 10 a hose 28 into it. This hose 28 is so attached that its one end 30 at the deep point inside the hollow body 10 to come to rest. The other end 32 is equipped with a float and is located outside the hollow body 10 - but inside the electrolyte 4 , This position causes the hose 28 during the electroplating process automatically completely with electrolyte 4 filled.

When lifting out the hollow body 10 sinks the second (floated) opening 32 of the hose 28 due to gravity below the level of the first opening 30 ( 1b ). Therefore, when lifting out of the electrolyte 4 internally 20 of the hollow body 10 Remaining liquid residue through the hose 28 outwards.

In the 2 also simplified arrangement shown 2 shows the longitudinal section through a hollow body 10 that by means of a pin 12 rotatable on a frame 8th is arranged.

The special thing about this arrangement 2 is the anode shown on the left in the picture 22 ' , which pivot on a pivot bearing 34 is attached.

The anode 22 ' is also hollow, ie formed as a tube. To the inner end of the pipe 22 ' is a piece of hose 28a flanged, its end 30 at the lowest point of the hollow body 10 to come to rest. At the outer end of the rod-shaped anode 22 ' is another, with swimmers 32 provided hose piece 28b flanged. Similar as according to 1a / 1b fills the hollow anode 22 ' and hose pieces 28a . 28b formed volumes when immersed with electrolyte fluid 4 while lifting out of the electrolyte 4 by emptying the hose / tube 28a . 22 ' 28b also a complete emptying of the hollow body 10 he follows.

2

Arrangement, contraption

4

galvanic Liquid, Electrolyte, electrolyte-liquid

6

container

4

electrolyte

6

galvanic bath

8th

frame

10

(to galvanizing) hollow body

12

spigot

14

longitudinal axis of the pin, longitudinal axis of the Hollow body, horizontal axis

16

pivot bearing

18

Opening of the hollow body

20

Interior of the hollow body, Interior, interior volume

22

Anode, electrode

22 '

(cave) tubular Anode, tube

24

gas bubble

25

electrolyte rest

26

inner surface

28

Hose / tube

28a, 28b

hose Connector

30

first opening, inner opening, one end of the hose

32

Swimmer, second opening, outer opening, other end of the hose

34

pivot bearing (the anode)

Claims (9)

Process for the galvanic coating of a - on a frame ( 8th ) - electrically isolated, - horizontally rotatable - fastened, - at least one undercut and - in an electrolyte ( 4 ) submerged hollow bodies ( 10 ), which, on the occasion of the electroplating process, turns into a rotation about a horizontal axis ( 14 ), wherein at least one anode ( 22 ) by a in the hollow body ( 10 ) opening ( 18 ) in its interior ( 20 ), characterized in that - a through the opening ( 18 ) partially in the hollow body ( 10 ) inserted tube or inserted tube ( 28 ) during the immersion of the hollow body ( 10 ) in the bathroom ( 4 . 6 ) automatically completely with electrolyte liquid ( 4 ), and - that the outer end (opening, 32 ) of the hose / tube ( 28 ) when lifting out the hollow body ( 10 ) from the electrolyte ( 4 ) due to gravity below the level of the interior of the hollow body ( 10 ) end (the first opening, 30 ), whereby when lifting out of the electrolyte ( 4 ) in the interior ( 20 ) of the hollow body ( 10 ) otherwise due to undercuts remaining liquid residue completely through the hose / pipe ( 28 ) expires. Method according to claim 1, characterized in that the hollow body ( 10 ) horizontally aligned in the plating bath ( 4 . 6 ) is immersed. Method according to claim 1 or 2, characterized in that the hollow body ( 10 ) during the electroplating process about its own, horizontally oriented longitudinal axis ( 14 ) is pivoted and / or rotated, wherein the at least one in the interior ( 20 ) of the hollow body ( 10 ) protruding anode ( 22 ) does not rotate. Method according to one of claims 1 to 3, characterized in that during the Galvanisierprozesses in the hollow body ( 10 ) protruding anode ( 22 ) into this position before and after galvanizing out again. Arrangement ( 2 ) for electroplating one on a rack ( 8th ) electrically insulated, horizontally pivotally and / or rotatably mounted, at least one undercut and in an electrolyte ( 4 ) submerged hollow bodies ( 10 ), in whose interior ( 20 ) through an opening ( 18 ) at least one anode ( 22 ), for carrying out the method according to one of claims 1 to 4, characterized in that - a hose / tube ( 28 ) through the opening ( 18 ) partly in the interior ( 20 protruding, where he / it at the lowest point of the interior ( 20 ) ends, and - that outside the hollow body ( 10 ) ending portion of the hose / tube (18) at its end ( 32 ) has a float. Arrangement according to claim 5, characterized in that the opening ( 18 ) of the hollow body ( 10 ) is laterally oriented during the electroplating process. Arrangement according to one of claims 5 to 6, characterized in that the anode ( 22 ) is tubular-hollow and a portion of the projecting into the interior of the hose / tube ( 28 ). Arrangement according to one of claims 5 to 7, characterized in that in the interior ( 20 ) of the hollow body ( 10 ) protruding anode ( 22 ) non-rotatable on the frame ( 8th ) is arranged. Arrangement according to one of claims 5 to 8, characterized in that the hollow body ( 10 ) on a pin ( 12 ) which is rotatable on the frame ( 8th ) is hinged and forms the counter electrode / cathode.