JPH07126894A - Electrodeposition coating device - Google Patents

Abstract

PURPOSE:To form coating films of a thickness uniform over the.entire part of the flanks of a work immersed in an electrodeposition liquid by disposing current shielding parts in the central parts of a part of electrodes among the plural electrodes facing the flanks of the work in parallel therewith. CONSTITUTION:An electrodeposition tank 2 storing the electrodeposition liquid is internally juxtaposed with the plural electrodes 3 facing the flanks of the work W immersed in the electrodeposition liquid in parallel therewith at prescribed intervals along the side walls in the tank. The respective electrodes 3 are housed into cylindrical cases formed of semipermeable membranes. At this time, the central parts of the required number of the electrodes 3a arranged on the outlet side of the tank are provided with the insulating covers 5 for prohibiting the energization to the lateral central parts of the work W to expose only the upper step parts and lower step parts thereof and to expose the entire surface of the other electrodes 3b. The coating films of the thickness uniform over the entire part are formed by subjecting the work W to electrodeposition with such constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeposition coating apparatus in which a plurality of electrodes are arranged side by side along a side wall inside an electrodeposition tank storing an electrodeposition liquid at required intervals.

[0002]

2. Description of the Related Art In an electrodeposition coating apparatus, electrodes facing a side surface of an object to be coated immersed in an electrodeposition solution are arranged side by side along a side wall in an electrodeposition tank at a predetermined interval so that the electrodes can be coated. By making the object soaked in the electrodeposition liquid and making the opposite electrode to the electrode, the ionized electrodeposition coating is electrically attached to the surface of the object to be coated, and the surface of the object to be coated is substantially uniform. It forms a coating film.

[0003]

However, when coating is actually performed and the thickness of the coating film is measured, the coating film formed on the side surface of the article to be coated is not always uniform, and the coating film on the central portion of the side surface is not necessarily uniform. Was found to be thicker than the upper and lower side surfaces. This is the amount of current supplied to the central part of the side surface rather than the amount of current supplied to the upper part of the side surface and the lower part of the side surface when energized from the electrodes extending from the upper part of the side surface to the central part of the side surface and the lower part of the side surface. It is thought that this is because there are more people.

When the coating film thickness is not uniform as described above, it is necessary to apply electricity until the upper side surface and the lower side surface have a predetermined thickness, so that it is necessary for the central portion of the side surface. Since the paint is adhered as described above, not only the expensive electrodeposition paint is wasted, but also the washing process, the air blowing process, and the baking process are difficult to finish uniformly, and there is a risk of defective coating. Therefore, in the present invention, when electrodeposition coating is performed, the coating thickness formed on the left and right side surfaces of the coating is made uniform to save the electrodeposition coating, and a coating failure due to uneven coating thickness is caused. The technical issue is to prevent it.

[0005]

In order to solve this problem, the present invention is directed to a side surface of an object to be coated which is immersed in the electrodeposition liquid along a side wall inside the electrodeposition tank in which the electrodeposition liquid is stored. In an electrodeposition coating apparatus in which a plurality of electrodes extending in parallel in the vertical direction in parallel with each other are arranged side by side at required intervals, at least one of the electrodes is energized to an object to be coated at an upper and lower intermediate portion thereof. It is characterized in that a current shield is provided.

[0006]

According to the present invention, a plurality of electrodes extending in the vertical direction facing the side surface of the article to be dipped in the electrodeposition liquid and extending in the vertical direction are arranged in parallel along the side wall of the electrodeposition tank at a required interval. At least one of the electrodes is provided with a current shield that blocks energization from the upper and lower intermediate portions to the center of the side surface of the object to be coated. Since the amount of electricity applied to the central portion is reduced, the amount of paint attached to the central portion is reduced, and a coating film having a uniform thickness is formed on the entire side surface of the object to be coated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a side view showing an electrodeposition coating apparatus according to the present invention, FIG. 2 is a perspective view showing a main part thereof, and FIGS.
[Fig. 6] is a perspective view showing a main part of another embodiment.

In FIG. 1, reference numeral 1 indicates a plurality of electrodes 3 along a side wall of an electrodeposition tank 2 in which the electrodeposition liquid is stored, facing a side surface of an article W dipped in the electrodeposition liquid and in parallel with each other. In the electrodeposition coating apparatus arranged in parallel at required intervals, the electrodes 3 are vertically extended from the upper side surface to the central side surface and the lower side surface, and are housed in a cylindrical case 4 formed of a semipermeable membrane. Thus, the diaphragm electrode device is configured.

Of the electrodes 3, a required number of electrodes 3a arranged on the outlet side have upper and lower intermediate portions of the object W to be coated.
It is shielded by the insulating cover 5 that blocks the central part of the side surface of the battery, and is housed in the case 4 with only the upper and lower parts exposed, and the other electrodes 3b are covered by the insulating cover 5 from the upper end to the lower end. It is housed in the case 4 with its entire surface exposed without being shielded.

The above is an example of the configuration of the present invention, and its operation will be described below. When electric power is started when the article W to be coated is completely immersed in the electrodeposition tank 2, a coating film is formed on the surface of the article W to be coated. Then, first, the middle portion is energized by the electrode 3b that is not shielded by the insulating cover 5, so that the central portion of the side surface of the article W is energized as compared with the upper side surface and the lower side surface of the article W. Since the amount is large, the coating film formed in the central portion is thickly applied.

Next, when the object W to be coated approaches the outlet side, this time, the electrode 3a whose upper and lower intermediate portions are shielded by the cover 5 is used.
As a result, the cover 5 blocks the energization of the central portion of the side surface of the object to be coated W, and the amount of the current is reduced, so that the amount of paint adhered thereto is reduced and the overall coating film thickness is reduced. Be uniform.

The electrode 3a has a cover 5 covering the middle portion thereof.
Not only in the case of covering with a cover, but as shown in FIG. 3, for example, as shown in FIG. 3, for example, a cover 5 is provided on the outer periphery of the case 4, or as shown in FIG. A shield plate 7 may be provided so as to be spaced apart from the electrode 6 at a position where the upper and lower intermediate portions of the electrode 6 and the central portion of the side surface of the article W face each other so as to prevent energization.

Further, an electrode in which the intermediate portion and its upper portion are covered with a current shield and an electrode in which the intermediate portion and its lower portion are covered with a current shield may be arranged in parallel to form a state in which the intermediate portion is covered. In short, if the current shield is arranged so as to be interposed between the intermediate portion of the electrode and the central portion of the side surface of the article W facing the current shield, the shape and the mounting method are arbitrary.

FIG. 5 is a side view showing another electrodeposition coating apparatus according to the present invention, which is parallel to the side surface of the object W to be coated immersed in the electrodeposition liquid stored in the electrodeposition tank 2. A plurality of electrodes 8 facing each other and extending in the horizontal direction are arranged side by side along the side wall in the electrodeposition tank 2 in a vertically multi-stage manner. Each electrode 8 is housed in a cylindrical case 9 formed of a semipermeable membrane, and among the electrodes 8,
An insulating cover 10 for blocking electric conduction from the electrode 8a to the central portion of the side surface of the object to be coated W is partially provided at the tip of the electrode 8a provided in the middle stage on the outlet side so as to cover the case 9. There is.

Also in this case, as in the case of the above-mentioned embodiment, the amount of current flowing in the middle portion of the side surface of the article W is reduced, so that the amount of paint adhering to the middle portion is reduced and the side surface of the article W is entirely covered. A coating film having a uniform thickness can be formed. The insulating cover 10 is not limited to be provided so as to cover the case 9 of the electrode 8a provided in the middle stage, and may be provided outside the electrode 8a inside the case 9. The shape and the mounting method thereof. Is optional.

[0016]

As described above, according to the present invention, the amount of electricity supplied to the central portion of the side surface of the object to be coated, which was conventionally thickly coated, is reduced, and a coating film having a uniform thickness as a whole is formed. Therefore, not only is it possible to save expensive electrodeposition paint and reduce the coating cost, but it is also possible to prevent coating defects due to uneven coating film thickness.

[Brief description of drawings]

FIG. 1 is a side view showing an electrodeposition coating apparatus according to the present invention.

FIG. 2 is a perspective view showing a main part thereof.

FIG. 3 is a perspective view showing a main part of another embodiment.

FIG. 4 is a perspective view showing a main part of another embodiment.

FIG. 5 is a side view showing another electrodeposition coating apparatus according to the present invention.

[Explanation of symbols]

 1 ... Electrodeposition coating device 2 ... Electrodeposition tank 3, 3a, 3b ... Electrode 4 ... Case 5 ... Cover (current shield) 6 ... Panel-shaped electrode 7 ...・ Shield plate (current shield) 8, 8a ... Electrode 9 ... Case 10 ... Cover (current shield) W ... Work

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadamichi Hirono 1-9 Kakimotocho, Toyota City, Aichi Prefecture Trinity Industry Co., Ltd. (72) Hirofumi Takada 1-9 Kakimotocho, Toyota City, Aichi Prefecture Address: Trinity Industry Co., Ltd.

Claims (4)

[Claims] 1. A vertical direction along a side wall of an electrodeposition tank (2) storing the electrodeposition liquid, facing the side surface of the article to be coated (W) immersed in the electrodeposition liquid in a vertical direction. In an electrodeposition coating apparatus in which a plurality of electrodes (3, 6) are arranged side by side at required intervals, at least one of the electrodes (3, 6) is energized to an object to be coated (W) at the upper and lower intermediate portions thereof. Electrodeposition coating device, which is provided with a current shield (5, 7) for blocking the 2. The current shield (5) is connected to the electrode (3).
The electrodeposition coating apparatus according to claim 1, which is mounted around the electrode (3a) so as to cover the intermediate portion of (a). 3. The current shield (7) is connected to the electrode (6).
2. The electrodeposition coating apparatus according to claim 1, wherein the electrode (6a) is provided so as to be spaced apart from (a) and to be disposed at a position where an intermediate portion of the electrode (6a) and a central portion of the side surface of the article (W) face each other. 4. A plurality of electrodes (8) extending in the horizontal direction facing the side surface of the article to be coated (W) immersed in the electrodeposition liquid stored in the electrodeposition tank (2) and extending horizontally. In an electrodeposition coating apparatus that is vertically arranged in multiple stages along the side wall in the deposition tank (2), the electrode (8a) provided in the middle stage is attached to the center of the side surface of the article (W) from the electrode (8a). An electrodeposition coating apparatus, which is partially provided with a current shield (10) for preventing energization of a portion.