JPS6046194B2 - Continuous partial plating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noble metal partial plating apparatus for band-shaped metal parts.

When electroplating a band-shaped component with a noble metal material, a partial plating method is used to limit the noble metal material to the functionally necessary areas.

One method for this is to apply a mask to the plating-preventing portion using tape or an insulating coating, or to pass the band-shaped component through a mask with holes in an elastic sheet and spray the plating solution. The former method has a disadvantage in terms of cost when attaching and removing the tape or insulating film, and the latter method has poor precision at the boundaries of the plated portions. Therefore, the width of the plated portion must be made wider than the functionally required dimension to avoid missing the plated layer. Furthermore, the plating liquid flow reaches the back side of the cathode plated object, and due to the current distribution, 20 to 30% of the surface plating layer is also applied to the back side.
A plating layer is formed. The present invention uses a permeable roll that rotates close to a strip-shaped part to supply and hold a plating solution, and limits the partial plating area using a roll plating brush that plating only the local area on one side that comes into contact with the plating solution. be.

That is, a brush, a rotating cylinder made of an insulating material and having a large number of plating solution discharge holes and on which the brush is attached, and a plating solution discharge hole and an anode arranged on a straight line in the axial direction coaxially with and inside the cylinder. and a hollow fixed ejection shaft having a hollow fixed ejection shaft, the plating solution supplied into the fixed ejection shaft is ejected from the plating solution ejection hole and seeped onto the surface of the brush through the plating solution ejection hole of the rotating cylinder. A plating device that continuously partially plating a predetermined portion of a strip-shaped component that is moved in a direction different from the rotational direction in contact with a plating solution discharged onto a surface, wherein the brush is a seamless cylinder made of a chemical-resistant fiber fabric. A continuous partial plating device characterized by a shaped body enables efficient partial plating of precious metals. Examples of the present invention will be described in detail below. Furthermore, the first
From the drawings to Fig. 5, the same reference numerals indicate the same parts. FIG. 1 is a schematic perspective view of a continuous partial plating apparatus using a brush according to the present invention.

For convenience of explanation, structural parts are omitted, a part of the continuous band-like part is removed, and a part of the constituent part is shown in cross section. The continuous band-shaped part 1 is, for example, an electronic exchange connector, and the width of the surface of the bent part 1a is about 2? Only functionally requires gold plating. The strip-shaped component 1 is continuously fed in the direction of arrow A at a constant speed by a drive device (not shown).

A cathode potential is applied to the strip component 1 by a metal fixed brush 2. What about strip part 1? It is pressed against the guide surface 4a of the guide component 4 by the moving presser roller 3, and is fed horizontally while being kept at a constant height. The plating solution is fed from the shaft 5 in the direction C, and the strip parts 1 are arranged in rows on the upper surface of the fixed spouting shaft 6.
A small hole placed in the feed direction. It ejects upward from 6a. Two rows of insoluble anodes 8 are attached to both sides of the small hole 6a. A cylindrical body 7 using a brush is provided which airtightly fits into the shaft portions 5 at both ends of the ejection shaft 6 and rotates on the ejection shaft 6 by receiving rotational force from gears. plating·
The liquid permeates through the surface of the cylindrical body 7 and is discharged, comes into contact with the bent surface 1a of the band-shaped component 1, and forms a current path. The spouted plating solution flows down as the cylindrical body 7 rotates, and is also refluxed by the pump. In this example, the cylindrical body 7 had a length of about 50 C7n, the rotation speed was 150 revolutions/min, and the plating solution was 500 e/min, thereby obtaining appropriate results. FIG. 2 is a side view of the cylindrical body 7 having a brush for brush roll plating.

The drawing shows the structure divided into four sections: top, bottom, left and right. Gears 9 are provided on both sides of the cylindrical body 7 and are rotatable about the shaft 5. The flange portion 9a of the gear 9 is airtightly fitted into the inner hole of the perforated cylinder 10, and is screwed at multiple locations. Perforated a
The outer surface of the cylinder 10 is made of highly elastic and seamless fibers made of chemical-resistant fibers.The cylindrical brush roll plating brush is made of polypropylene-based synthetic fibers or polyamide-based synthetic fibers. A knitted cylinder made of synthetic fibers is used. This fiber cylinder 11 is placed over the perforated cylinder 10, and both sides are joined to the perforated cylinder 10. Inside the perforated cylinder 10 is an insoluble anode 8 as shown in FIG.
A jet shaft 6 having a diameter is provided. FIG. 3 is a sectional view of the main parts of the connector terminal 1 and the brush roll plating brush.

The plating liquid 12 ejected from the perforated cylinder passes through the texture of the fiber cylinder 11, permeates and discharges onto the surface of the fiber cylinder 11, and comes into contact with the connector bent surface 1a. The plating liquid 12 discharged from the texture of the fiber cylinder 11 flows down as the cylinder body 7 rotates while forming an averaged and uniform liquid film 12. A current is generated between the insoluble anode 8 in the plating solution and the surface of the bent portion 1a of the strip-shaped component 1 which is given a cathode potential. FIG. 4 is a cross-sectional view of a part of the side surface when a thread is wound around the perforated cylinder 10.

The amount of plating liquid that permeates and discharges varies depending on the gap between the threads, and the liquid film is not smooth and the plated area is not uniform. FIG. 5 is a cross-sectional view of a perforated cylinder 10 in which fibers are overlapped and sewn together.

The liquid film of the plating solution changes with each rotation of the perforated cylinder 10, resulting in inaccurate width of the plated portion. As described above, according to the present invention, a smooth and stable liquid surface on the brush can be formed.

Therefore, it is possible to precisely define the plating area and to apply plating to a uniform thickness. In addition, the plating solution may not be applied to the back side of the product to be plated (
This prevents it from turning to the top (in the figure of the invention). When functional plating with precious metals is applied, such as in connectors, it is possible to limit the functional plating to only the functional contact parts, making it possible to significantly reduce the amount of precious metal materials used. Furthermore, the amount of plating solution that adheres to the plated item is kept to a minimum, there is little leakage during subsequent washing with water, and recovery is also easy. In addition, since the water washing process is sufficient with small and short equipment, the equipment can be downsized, which is effective in terms of cost and floor space. Additionally, the amount of plating solution circulated is minimized, making asset management and quality control easier. Furthermore, the burden on wastewater treatment facilities will also be reduced due to the reduction in the amount of wastewater. Although the embodiment of the present invention is based on a connector for an electronic exchange, it is not limited to this product, and can be similarly applied to connectors in general.

Furthermore, although the presence of a bent portion in the connector as in this embodiment facilitates partial plating, it is also possible to plate the connector in other shapes, for example in the form of a band on a flat plate.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a continuous partial plating apparatus using a brush roll plating brush according to the present invention, FIG. 2 is a side view of a cylindrical body having a brush roll plating brush according to the present invention, and FIG.
The figure is a cross-sectional view of a connector terminal and a brush roll plating brush according to the present invention, FIG. 4 is a cross-sectional view of a part of the side surface when thread is wound around a perforated cylinder, and FIG. It is a sectional view in the case of overlapping stitching. In the figure, 1 is a belt-shaped part, 6 is a jet shaft, 7 is a cylindrical body, 1
0 indicates a cylinder with holes, 11 indicates a fiber cylinder, and 12 indicates a plating solution.

Claims (1)

[Scope of Claims] 1. A brush, a rotary cylinder made of an insulating material and having a large number of plating solution discharge holes on which the brush is attached, and a plating solution discharge hole coaxially and internally installed in the cylinder and arranged on a straight line in the axial direction. and a hollow fixed ejection shaft having an anode, the plating liquid supplied into the fixed ejection shaft is ejected from the plating liquid ejection hole, and permeates onto the brush surface through the plating liquid ejection hole of the rotating cylinder. A plating device that continuously partially plating a predetermined portion of a strip-shaped component that is moved in a direction different from the rotating direction in contact with the plating solution discharged onto the surface of the brush, wherein the brush is made of a chemical-resistant fiber fabric. A continuous partial plating device characterized by a seamless cylindrical body made of. 2. A continuous partial plating apparatus according to claim 1, characterized in that polypropylene synthetic fibers are used as the chemical-resistant fibers. 3. A continuous partial plating apparatus according to claim 1, characterized in that polyamide synthetic fibers are used as the chemical-resistant fibers. 4. A continuous partial plating device according to claim 1, characterized in that a stockinette knit is used for a seamless cylinder. 5. A continuous partial plating apparatus according to claim 1, characterized in that a twill weave is used for a seamless cylinder.