DE1239160B - Device for electroplating ring-shaped bodies - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN ^ lljmw PATENT OFFICE

EDITORIAL

Int. CL: C 23 b

German class: 48 a -6 S ~~ SZ L.

Number: 1 239 160

File number: Sch 33242 VI b / 48 a

Aimcldetag: May 4th, 1963

Open date: April 20, 1967

C250 7- \

The invention relates to a device for the internal electroplating of ring-shaped bodies.

It is known to use annular bodies e.g. B. Bearing half-shells made of aluminum, made of St-Al composite material or other bearing metals in electroplating devices with an inner anode on the inner surface to provide a galvanic layer. The half-shells are usually paired for this purpose Assembled a circular ring and received by appropriate brackets, in the center the anode (e.g. a round rod made of nickel, copper or lead) is arranged. The ones to be electroplated Objects themselves are connected cathodically to the device. They get their electricity just like the anode via the suspension arm of the electroplating device or via a cable connection to the Power source. Analogous to the statements made at the beginning, it is also possible and customary to use closed Ring body, such. B. bearing bushes to be treated galvanically with inner anode. In all of these However, due to the relatively short distance between anode and cathode, this is the case Reason required geometric positional accuracy of the anode or the half-shells or ring bodies a decisive disadvantage to each other. This can be illustrated by a small numerical example. Already 1 mm decentering of the anode can be up to with a sleeve diameter of about 50 mm 5 μ difference in the layer thickness of the galvanic deposit cause what with an average Total precipitation of 20 μ already makes up 25%. In addition, the inner anode offers disadvantages associated with loss of time when charging the electroplating apparatus, which are associated with ring bodies cannot be automated.

Finally, it should be mentioned that during the GaI-vanizing Disturbances of the electrolyte balance arise from the fact that the surface ratio the anode rods in the center of the ring body is extremely unfavorable compared to the cathode surface have to be. Constant changes occur due to the dissolution of the anode during the galvanic process the anode-cathode surface ratio, which leads to further uncertainty about the deposition ratios leads. In addition, the removal of the anode leads to a progressive reduction in the stability of the anode, d. H. increased risk of anode decentering.

For these reasons, attempts have already been made to replace the inner anode during electroplating with an outer anode in the bath tank. The prior publication device for electroplating ring-shaped, which has become known in this field
body

Applicant:

Karl Schmidt

Company with limited liability,

Neckarsulm (Württ.), Christian-Schmidt-Str. 10

Named as inventor:

Dr. Bernhard Kiefer, Heilbronn / Neckar;

Alfred Buske, Neckarsulm (Württ.)

However, healings deal exclusively with electroplating equipment for half-shells and not, according to the subject matter of the invention, with closed ring or bearing bodies. The invention The underlying task is to enable the use of the outer anode also with bearing bushes. The problem is solved by means of a narrow container divided into several longitudinal shafts achieved in which the ring-shaped body to be electroplated, for example bearing bushes, flat in a row are arranged side by side with mutual contact so that the centers of the circular openings provided in the two container walls in the central axes of the to galvanizing sockets. The shafts of the container are dimensioned so that the bearing bushes to comply with the small positional tolerances are closely guided therein. The bushings are in common Connected cathodically, the contact of the individual socket in each case via the mutual contact points or sets the lines of contact of the individual bearing bodies. The container itself that made up

electrically non-conductive material, such as plastic, should exist, allowed by both sides each bearing bush centrally arranged bores allow the streamlines to pass between them Outer anode and cathode. The diameter of the holes in the container walls must be in certain In relation to the diameters of the socket to be galvanized.

The figures illustrate a device for the use of external anodes according to the invention when electroplating closed ring bodies. Figures 1 and 2 are side views of the invention Contraption;

709 550/291

Fig. 3 shows the section A-B according to Fig. 1 (top view); FIG. 3 also shows a detail of a plan view of the bottom of the container according to FIG. 1 shown.

The container 1 according to FIG. 1 consists of an electrically non-conductive material, for example made of plastic. It is divided into several, in this case four, longitudinal shafts 2 (FIG. 3), which are suspended in State of the container 1 are arranged vertically. The shafts 2 are interconnected by walls 3 separated. The sockets 4 to be electroplated are filled into the shafts 2 in a magazine-like manner. The narrow sides and the bottom of the container 1 are formed by a metal frame 5, both as Bracket and also serves as a contact rail. The current contact 6, which is used for the cathodic circuit of the Bearing bushes is required, is on the underside of the container at the support points of the bushes 4 made on the metal frame 5. The contact between the individual sockets in the shafts is set automatically by the mutual contact points of the parts to be electroplated. the both side walls of the container 1 each consist of a non-conductive synthetic peat plate 7 (Fig. 2 and 3), which together with the partitions 3 lead the bearing bushes. In the side walls 7 are on both sides in each case at the level of the axes of the bearing bushes bores are provided that the flow of current between Allow anode and cathode during electroplating. The diameter of the holes 8 must be in one have a certain relationship to the inside diameter of the parts to be electroplated. On the frame 5 a holding device 9 is attached to which the entire container 1 is suspended and electrically conductive connected to the power source. The semicircular provided in the bottom of the container 1 near the edge Holes 10 according to FIG. 4 (cutout) serve as drainage openings.

Claims (3)

Patent claims: 1. Apparatus for electroplating annular bodies such as bearing bushings using of external anodes, characterized by a narrow, electrically non-conductive one Material, in particular plastic, existing container (1), its narrow sides and the bottom are formed by a metal frame (5) and divided into several longitudinal shafts (2) is, in which the to be electroplated annular body (4) flat in a row under each other Touch are arranged side by side so that the centers of the two container walls (7) provided circular openings (8) in the central axes of the to be electroplated Parts (4) lie. 2. Apparatus according to claim 1, characterized in that in that, the bottom of the container (1) forming part of the metal frame (5) drainage openings (10) are provided. 3. Device according to claims 1 and 2, characterized in that the metal frame (5) is rubberized on all sides with the exception of the contact points (6). 1 sheet of drawings