JPS5822539B2 - Partial plating method for resin moldings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of partially plating a resin molded body with a plated insulator.

BACKGROUND ART In general, knobs arranged on the front operation parts of television receivers, radio receivers, etc. are molded with resin, and a thin metal film is formed on the surface by plating for decorative purposes.

In this case, since the metal thin film is conductive, there is a risk of electricity passing through the knob from the chassis and causing electric shock or noise, so the part corresponding to the knob shaft should not be plated. There is a need.

To form such non-plated parts, the conventional method has been to coat the resin molded product with a mask that serves as a plating insulator, plate the entire product, and then remove the mask (peeling). .

Forming non-plated parts using a mask in this way is called masking.

Types of masking include covering with rubber caps and resin caps, but after plating, the caps can be peeled by removing each cap from the storage box and then peeling it off with pliers or using power. They would grab it by hand or hook it onto something.

This requires manual labor, is cumbersome to operate, and requires a large amount of force for peeling.

This invention was invented in order to correct the defects as described above, and it is necessary to attach a cap-shaped adherend (for example, a rubber cap) to the outside of a resin molded body (for example, a knob of a television receiver).
a step of plating the entire resin molded body with the adherend attached, and a step of reducing the pressure in the inner space formed between the resin molded body and the adherend. A method for partially plating a resin molded body, comprising the step of removing the adherend from the resin molded body by making the pressure relatively higher than the pressure in the outer space of the resin molded body and the adherend.

This method greatly simplifies the operation and allows mass processing.

Next, an embodiment in which the present invention is applied to a knob of a television receiver will be described with reference to the drawings.

First, the structure of the knob used for plating will be explained with reference to FIG.
b is covered with a rubber cap 2 as a plated insulator.

Then, in this state, the whole knob is immersed in a tin-based alloy plating bath, such as 5n-Ni, 5n-Co, etc. (If electroless plating is performed by immersing the knob in this bath, a rubber cap will appear as shown in Figure 2. The metal thin film 3 can be uniformly deposited on the surface of the knob 1 other than 2.

Next, the method for removing the rubber cap 2 after plating will be described. First, as shown in FIGS. Insert the high-pressure air injection needle 5 into the rubber cap 2.

Next, when high-pressure air is sent into the space 4 through the needle 5, this air pressure is applied to the inner surface of the rubber cap 2 in the direction of the arrow 6 within the space 4, and as a result, the rubber cap 2 expands as shown in the figure, and finally As shown in FIG. 3B, the rubber cap 2 can be easily removed from the knob shaft portion 1a.

In this case, the air pressure is also applied to the bottom surface of the knob in the space 4, so when the air pressure is increased, the knob 1 pops out in the direction of arrow 9, and at the same time, the rubber cap 2 and needle 5 move toward the shaft part 1.
Leave all at once in the direction of arrow 10 from a.

By removing the rubber cap 2 in this manner, the end portion 1b of the knob shaft portion can be made into a non-plated portion where the metal thin film 3 is not present.

As described above, in this embodiment, since the adherend, that is, the plated insulator, to be attached to the knob 1 is the rubber cap 2, its thickness may be relatively thin, and the rubber cap 2 may be Since the rubber cap 2 is simply attached to the outside of the end 1b of the knob 1, it is extremely easy to remove the rubber cap 2 without using human power by simply injecting high-pressure air into the air 4 through the needle 5 after plating is completed. And it can be done easily.

Further, since no special jig is required to remove the rubber cap 2, mechanization is facilitated.

The knobs 1 after plating are stored in each section of the storage box 7 as shown in FIG. 5, but in the conventional method, these knobs were taken out individually and then the rubber cap 2 was removed.

However, in this embodiment, a high-pressure air supply device 8 equipped with a large number of needles 5 is used, and the dowels 5 are simultaneously pierced into the rubber caps 2 of each knob in the storage box 7 as described above, and high-pressure air is supplied. By doing so, it becomes possible to remove a large number of rubber caps 2 at once.

Therefore, it is very easy to mechanize and can be operated with the individual knobs stored in the storage box, making it extremely suitable for performing a large number of partial plating processes at the same time.

Although the present invention has been described above based on one embodiment, it will be understood that further modifications can be made based on the technical idea of the present invention.

For example, the place where the needle 5 is inserted is the rubber cap 2 and the shaft part 1.
It can be made into a part where a and a are in close contact with each other.

Further, in the above embodiment, high pressure air was injected, but
By pulling the outer space of the knob 1 with a vacuum pump, the rubber cap 2 can be inflated outward and removed even if the pressure is made much smaller than that in the inner space 4.

In this case, air may be injected into the space 4 while creating a vacuum.

Moreover, it is also possible to use a resin cap instead of a rubber cap.

As described above, in the present invention, since the adherend to be attached to the outside of the resin molded body is cap-shaped, its thickness may be relatively thin, and the adherend is simply attached to the resin molded body. Therefore, by simply making the pressure in the space between the adherend and the resin molding relatively larger than the pressure in the outer space, the adherend can be inflated using the pressure difference between the inside and outside, and the Since it can be easily removed and no human effort is required, the operation for removing the adherend after the plating process can be greatly simplified.

Therefore, it is easy to mechanize, and a large number of adherends can be removed at the same time after the plating process while a large number of articles are housed in a case, and a large number of partial plating processes can be performed simultaneously.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a knob of a television receiver. Figure 1 is a sectional view of the knob and the rubber cap separated, and Figure 2 is a sectional view of the knob with the rubber cap removed. Figure 3A is a cross-sectional view of the state in which the rubber cap is covered with a high-pressure air injection needle;
Figure B is a perspective view of the rubber cap removed after high-pressure air has been injected, Figure 4 is a sectional view taken along line IV-IV when high-pressure air is injected in Figure 3A, and Figure 5 is a perspective view of each section of the storage box. It is a partial cross-sectional view of a state in which each injection needle is stuck into the rubber cap of the arranged knob. In addition, in the symbols used in the drawings, 1 is the knob, and 2 is the knob.
3 is a rubber cap, 3 is a metal thin film, and 5 is a needle.

Claims (1)

[Claims] 1. A step of attaching a cap-shaped adherend to the outside of the resin molded body, a step of plating the entire resin molded body with the adherend attached, and a step of plating the resin molded body and the adherend. and the step of removing the adherend from the resin molding by making the pressure in the inner space formed between the resin molding and the adherend relatively larger than the pressure in the outer space of the resin molding and the adherend. A method for partially plating resin molded objects.