JPS6360840B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the plating of minute metal parts, and more particularly to a plating container adapted to receive the parts and to be immersed in a plating bath.

Prior Art As shown in Fig. 1, a conventional plating container has a square bottom 1 formed by a metal grid 1, and upright metal rods 2 are welded to the four corners of the square. A metal cage-like body 5 for electrodes (the first
(Fig. 2) and a synthetic resin net 6 (Fig. 2) that covers this metal cage-like body from the outside.

Problems to be Solved by the Invention A drawback of conventional containers is that a large amount of plating metal adheres to the metal grid and the upright metal bars, which are the strength members forming the bottom of the metal cage, and that it is extremely uneconomical in the case of precious metal plating;
Because minute parts to be plated (for example, the second hand of a watch) get stuck between the grid and the synthetic resin net, and because it is difficult to manufacture the grid with accurate pitches, the current density is not constant, and therefore the plating is difficult. becomes non-uniform, etc.

The aim of the invention is to provide a container which eliminates these drawbacks.

Means for Solving the Problems The above objects are achieved by the following container according to the invention. That is, in the container 10 for receiving minute metal parts and plating the parts, the container: has an open top surface having a bottom surface for supporting the parts and side surfaces having a predetermined height to prevent the parts from falling. The net-like body is made of synthetic resin monofilament warps 21 and wefts 22, 24, and cathode metal wires 22 woven at predetermined intervals as warps and/or wefts so as to be in contact with the component. a net-like body; a metal frame 12 fixed to the net-like body along the side surface of the net-like body and conductively coupled to the cathode metal wire; a metal frame 12 conductively coupled to the metal frame, the upper end of which is connected to a power source; A container 1 for plating minute metal parts, comprising a hanging metal wire 13 adapted to be connected to a terminal;
0'' achieves the above objective.

Function: The parts to be plated are placed in the container 10 and immersed in a plating bath containing an anode. When the anode terminal of the DC power supply is connected to the anode in the bathtub and the cathode terminal is connected to the upper end 14 of the metal wire 13 for hanging of the container 10, the metal wire 13 for hanging and the metal frame 12 connected thereto, Since the cathode metal wire 22 connected to the metal frame 12 and the part to be plated placed in the container net 11 in contact with the cathode metal wire 22 are electrically connected, the anode terminal and This part is plated by applying a DC voltage between the cathode terminal and the cathode terminal.

The mesh body 11 has cathode metal wires 22 woven into the mesh instead of a part of the warp and/or weft, so the mesh surface is smooth and there is no space between the grid and the mesh as in the prior art. Small parts to be plated will not get into the area. The net is woven with a constant warp pitch and a weft pitch, and the metal wire 22 for the cathode
Since they are arranged at predetermined intervals, the current density is relatively constant and plating is performed uniformly. Furthermore, since a metal grid is not used as in the prior art, uneconomical adhesion of plating metal to the grid can be avoided.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 3 is a perspective view of one embodiment of the container 10 of the present invention.

The synthetic resin used as the material for the monofilaments constituting the warp and weft of the network is preferably selected from polyester, polyamide, polyethylene, polypropylene, fluororesin, and the like.

The net may be any of multiple weaves such as single-layer weave, double-layer weave, and triple-layer weave. As a single layer weave, satin weave, twill weave, etc. are preferable. Examples of multiple weaves include single warp and weft double weave, double warp and single weft weave, double warp and double weft weave,
It is preferable to use a double-warp, triple-weft weave or the like.

As the material of the cathode metal wire 22, copper, iron, nickel, aluminum, alloys thereof, etc. are used. It is preferable that the cathode metal wire 22 is woven so that more of the cathode metal wire 22 is exposed on the inside than on the outside of the container so that it can easily come into contact with the parts to be plated. for example,
When woven into a single-layer mesh, the crimps of the metal wires 22 exposed on one side of the mesh preferably have longer floats than the crimps exposed on the opposite side. In the case of a multi-woven net, for example, in the case of a single-warp and double-weft fabric shown in FIG. It consists of a cathode metal wire 22 woven as a part of the weft,
It is preferable that the upper layer wefts 22 and 23 face the inside of the net-like body 11.

The liquid in the plating tank may get heated, so
Preferably, the mesh is fixed by heat treatment at a temperature of 150°C or higher.

The stitching of the net depends on the size of the parts to be plated, and for fine pieces, the warp threads are per inch of width.
300 mesh is often used, and the weft mesh is preferably about 100 mesh.

The pitch of the metal wires 22 also depends on the size of the parts to be plated, and for fine parts, a pitch of about 2 mm to 10 mm is preferable. The diameter of the metal wire is preferably within the range of 0.05 mm to 2 mm.

Example Single warp and double weft weave (Figure 5): Warp: Diameter = 0.17mm Mesh = 148/25.4mm Upper weft: Diameter = 0.19mm Mesh = 50/25.4mm Lower weft: Diameter = 0.22mm Mesh = 50/25.4mm metal wire for cathode: as a substitute for a part of the upper layer weft,
Bronze wires of 0.23 mmφ are woven into every 10 threads (approx. 5 mm pitch) to replace part of the warp threads.
Bronze wires of 0.23mmφ were woven every 50 lines (pitch approximately 8mm).

This net is cut to fit the box shape as shown in the developed view in Figure 4, and the required length is cut from the parts 31, 32, 33, 34 (Figure 4) that will be the upper edges when the box shape is made. A few threads are pulled out so that the metal wires 22 protrude, and the four corners are fixed by welding, gluing, or suturing to form a box shape. Next, the metal wire 22 protruding from the upper edge of the box shape was brazed to the metal frame 12.

The mesh body 11 was attached to the metal frame 12 by tying it with synthetic resin threads.

Effects of the invention (1) The inner surface of the net has a single-layer structure compared to the conventional two-layer structure, and the surface is smoother than the inner surface of the conventional basket, so that products do not get caught.

(2) The pitch of the cathode metal wire 22 is uniform, and the current density distribution can be made uniform, so that uneven plating can be eliminated.

(3) The pitch of the cathode metal wire 22 can be freely changed depending on the size of the part to be plated, and the current density can be changed freely.

(4) Since the metal wire 22 for the cathode is not a strength member like the grid of the prior art, the metal wire 22 of the grid is
Since it is possible to select a diameter much smaller than φ), the amount of plating precious metal consumed can be saved.

(5) Since the main body of the net is made of synthetic resin, the parts to be plated will not be damaged.

(6) It is lightweight, easy to handle, and resistant to corrosion.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a metal cage-like body of the prior art. FIG. 2 is a schematic perspective view of a synthetic resin net that is to be placed over the cage-like body from the outside. FIG. 3 is a schematic perspective view showing the container of the present invention.
FIG. 4 is a developed view of a mesh body which is one component of this container. FIG. 5 is a partial cross-sectional view showing one embodiment of the structure of the net-like body. DESCRIPTION OF SYMBOLS 10...Container, 11...Mesh body, 12...Metal frame, 1
3... Metal wire for hanging, 21... Meridian, 23... Upper layer weft, 24... Lower layer weft, 22... Metal wire for cathode.

Claims (1)

[Claims] 1. A container for receiving minute metal parts and plating the parts, wherein the container has: a bottom surface for supporting the parts, and side surfaces having a predetermined height to prevent the parts from falling. The net-like body has an open top surface, and the net-like body has warps and/or wefts of a synthetic resin monofilament at predetermined intervals.
or a net-like body 11 consisting of a cathode metal wire woven as a weft so as to be in contact with the component; fixed to the net-like body along the side surface of the net-like body and coupled to the cathode metal wire in a conductive manner; A container for plating minute metal parts, the container comprising: a metal frame 12 made of metal; . 2. The container according to claim 1, wherein the synthetic resin monofilament is a monofilament of a synthetic resin selected from the group consisting of polyester, polyamide, polyethylene, polypropylene, and fluororesin. 3. The container according to claim 1, wherein the net-like body has a single layer woven structure. 4. The container according to claim 1, wherein the net-like body has a multi-woven structure. 5. The container according to claim 3 or 4, wherein the cathode metal wire is woven so that more of the cathode metal wire is exposed on the inside than on the outside of the container. 6. Claim 5, wherein the cathode metal wire woven into the single-layer woven network is configured to have a longer float on the inside of the container than on the outside of the container. Container as described in. 7. Among the thread layers constituting the multi-woven network, the cathode metal wire is woven only into the thread layer arranged on the side facing the inside of the container;
The container according to claim 5, characterized in that: 8. The multi-woven network consists of two weft layers and a warp that connects the weft layers to each other, and the cathode metal wire is only in the yarn layer facing the inside of the container among the weft layers. 8. Container according to claim 7, characterized in that it is woven.