JPS6326197B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for fleshing decorative chains by electroplating. There are many types of decorative chains used for net dresses, bracelets, pendants, etc., but most of these are manufactured in long lengths using dedicated automatic chain making machines. The chain is used as it is, or it is further processed in various ways to create decorative chains with a variety of designs. Processing methods for these decorative chains include cutting off a certain side of the chain, flattening a part of the chain with a roll or the like, or adding a pattern, and compression deformation. Generally, it is desirable for decorative chains to be connected so that each individual chain link can be bent freely as a unit, and depending on the structure of the chain, there may be a limit to its directionality and degree of freedom, but at least it can be It must be flexible enough to bend or move smoothly to the extent that it can be used without any problems. To this end, the shorter the interval between connections compared to the size of the chain linkage, that is, the shorter the interval between bending fulcrums, or in other words, the more connections there are within a unit length, the more flexible the chain will be. Although the relatively short spacing between the chain links greatly contributes to the flexibility of the chain, there are major restrictions when mechanically narrowing the spacing. Normally, for example, in the case of a cable chain in which simple oval-shaped wire links are connected in a single piece, the cut wires are wound around the core rod to form the link, or the wires are wound in a spiral shape and then cut and connected. In either case, there is a connecting process, so theoretically it should be possible to narrow the direct connection interval to an inner diameter large enough to accommodate two wires (2d when the wire diameter is d), but in reality it is 2.5d. The limit is up to
Even an inner diameter of 2.5d is actually quite difficult technically, and it is usually around 3d. Moreover, it is even more difficult to braze this dense chain of about 3D so that it has sufficient strength. Based on this knowledge, the inventor of the present invention investigated a method of making the connection spacing of wire irons closer together, and found that by applying a high-quality, dense electrodeposited layer under the plating conditions for ordinary copper wire irons. It has been found that this method can serve the specified purpose. Furthermore, as a result of conducting research and experiments on the method of thickening the wire iron using this electric iron, the inventor found that when the wire iron is thickened using the electric iron, the connection strength of the wire iron significantly decreases as the wire becomes thicker. It has been found that it is possible to provide a decorative chain which is increased and the connecting intervals of each wire linkage are closely packed, and which is excellent in terms of performance and appearance, and is particularly advantageous when performing compression deformation processing in a subsequent process. Furthermore, if electroplating is applied so that the weight of the decorative chain before electroplating becomes at least twice as large after electroplating, even if the chain material is not brazed at the butt part of each wire. It was also discovered that the same strength as a pre-brazed chain can be obtained, and the brazing process can be omitted, and that if the material is made of a brazed chain, it can be about twice as strong. Ta. The present invention has been made based on these results, and uses a conventional method to overlay a high-quality and dense electrodeposited layer on a decorative chain with coarse connection intervals under normal plating conditions for copper electroplating. The intended purpose was achieved by increasing the weight of the thickened chain and narrowing the connection spacing between the wire links. An advantage of the electroplating of the present invention is that the overlay is relatively thick on the outer parts and relatively thin where it overlaps and is shaded, such as in connecting members, yet it can be thickened to the required dimensions. It is easy to convert the voltage into 100%, and its accuracy can be precisely controlled by controlling the electric current, time, etc. Also, if you electrodeposit while moving the chain, the connection fulcrums that are relatively difficult to electrodeposit will also have the effect of reducing the distance between the fulcrums, and by electrodepositing to fill the space between the links in this way, it will extend in the connection direction. In addition to having the effect of reducing the space and the degree of deformation, it is also extremely advantageous when performing compression deformation or other processing. As mentioned above, when fleshing is performed by electric plating according to the method of the present invention, there is a tendency to greatly increase the strength, but this tendency is noticeable in the process of increasing the weight to twice the weight, and increases after that point. This indicates a phenomenon in which the trend slows down and approaches saturation. The present invention is characterized by making use of this phenomenon to increase the size, and in doing so, it has the effect of increasing the strength of the butt joints with or without brazing, and also has the advantage that brazing can be omitted. Furthermore, according to the method of the present invention, strengthening of the above-mentioned joints makes the connection intervals closer together, which in turn reduces the occurrence of breakage and unnecessary parts during subsequent processing such as compression deformation processing. It also has benefits. In this way, the electroplating process of the present invention is not only effective as a strength supplement for the compression deformation process that is often performed subsequently, but also enables the production of chains of greater variety and higher decorative value by itself. It has a soothing effect. In other words, there is a natural limit to the variety of chains that can be produced by an automatic chain-making machine, but according to the method of the present invention, inexpensive chains that can be made by automatic machines can be used as raw materials and can be made into new and interesting chains. It has the advantage of being able to produce a wide variety of chains. Examples of the present invention are shown below. Example As shown in Figure 1a, the inner diameter l of the wire 1 is the wire diameter d.
Electroplating was carried out using a device as shown in FIG. 2, using a brazed product and an unbrazed cable chain 2 having a thickness approximately three times as large as that of the brazing material. In Figure 2, 3 is an electroplating tank containing plating liquid;
4 is a fixed anode, 5 is a cathode that also serves as a hook for chain 2, and electroplating was performed under the following conditions. Plating liquid composition: H ₂ SO ₄ , 60 g/, CuSO ₄ , 290 g/ Temperature: 28°C Current density: 1.5 to 2 A/dm ^2As a result, the products shown in Figure 1 b, c, and d were obtained.The results are as follows. It is as follows. In addition, those in Table 1 are red copper (85Cu-15Zn) wire diameters.
The results are for a 50 cm oval chain material in which the 0.05 nm joint portion is not brazed, and Table 2 shows the results when the same as above is brazed.

【table】

[Table] This relationship is illustrated in FIG. 3, and it can be seen that the strength increases significantly up to about twice the weight, and thereafter the increase is relatively small. When a non-brazed material is electroplated, it has twice the weight and has the same strength as a brazed material, and when a brazed material is electroplated, it has twice the weight and almost twice the strength. The cross-sectional area of the joint has more than doubled and its enlargement has stopped.

[Brief explanation of the drawing]

FIG. 1 is a front view and a side view of a decorative chain showing enlargement due to electroplating of the chain material according to an embodiment of the present invention at different magnifications, where a is the chain material, b is 2.01 times, c is 3.03 times, d indicates enlargement of 4.99 times. FIG. 2 is an explanatory diagram of the electroplating method in the embodiment of the present invention, and FIG. 3 is a chart showing the relationship between enlargement and strength in the embodiment of the present invention. 1... Wire iron, 2... Chain material, 3... Electroplating tank, 4... Anode, 5... Cathode.

Claims (1)

[Claims] 1. A decorative copper alloy chain in which each wire link is interconnected with an inner diameter sufficiently large for the wire diameter is used as a material, and a CuSO ₄ −H ₂ SO ₄ plating bath is used to create approximately Electroplating is performed at a current density of about 1.5 to 2 A/dm ² to overlay and thicken a dense electrodeposited copper layer with good compression deformation resistance on the surface of the above-mentioned material chain, and at the same time, the connection spacing between each wire iron is made dense. Electroplating process for decorative chains characterized by tightening. 2. Electroplating of a decorative chain according to claim 1, characterized in that the decorative chain material in which the joints of the wires are brazed is electroplated to increase its strength. Attached processing method. 3. Claim No. 3, characterized in that the joint portion of each wire link is made of a non-brazed decorative chain material by electroplating to give it strength comparable to that of a brazed decorative chain material. The method for electroplating a decorative chain according to item 1. 4 Electroplating of a decorative chain, characterized by subjecting the decorative chain plated by the method described in any one of claims 1 to 3 to compression deformation. Construction method.