JPH0688010B2 - Painting method and equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and an apparatus therefor, and more particularly to a coating means capable of separately coating a member to be coated having an opening in two or more colors.

[Conventional technology]

Conventionally, various coating methods have been provided. However, in the case of separately coating a member to be coated in two or more colors, tape coating or cover masking is used to perform spray coating by distinguishing the coated portion from the coated portion. Is common.

[Problems to be solved by the invention]

However, in the case where two colors are separately coated by the above-described coating method, the surface of the member to be coated needs to be covered with a masking tape or a masking cover, so that the coating process is complicated and the masking tape is used. In the case of a product, the coating interface becomes rough at the time of peeling, and it is necessary to shape this in a later step.

On the other hand, in the case of using the masking cover, it is difficult to adhere the surface of the member to be coated,
During spray coating, the paint may enter the non-adhesive portion and the interface may become unclear.

Furthermore, when the shape of the member to be coated is complicated, none of the above methods can be used, and therefore the member to be coated is limited to a simple shape.

Therefore, it is conceivable to apply the coating by a dipping method which does not have these drawbacks. In this method, however, the member to be coated is submerged in the coating material at the boundary of the separate coating of the member to be coated. If the member to be coated has an opening, the paint will adhere to the inside of the opening. For this reason, this method may not be adopted when there is a portion of the member to be coated that does not need to be coated.

The present invention has been made in view of the above matters, and is not restricted by the shape of the coating surface of the member to be coated, accurate coating can be performed separately, and the coating adheres to the portion that does not require coating. It is a technical issue to use a non-painting method.

[Means for solving problems]

In order to solve the above-mentioned technical problem, the present invention provides a coating method in which the bottomed cylindrical member 5 to be coated having the opening 5a is dipped in the coating material A in the dip tank 1 for coating as follows. I took technical measures.

That is, in the notch 6 formed at the upper edge of the dip tank 1,
The member 5 to be coated is held in close contact so that the opening 5a is located outside the side wall 1a of the dip tank 1, and then the relative position between the liquid surface of the coating material and the member 5 to be coated is brought closer to an arbitrary position on the member 5 to be coated. Sink up to paint A and paint.

In order to bring the relative position between the coating liquid surface and the coating object member 5 close to each other, the notch 6 can be moved downward or the coating liquid surface side can be raised.

The device for carrying out this method comprises a dip tank 1 and a holding arm 7.

That is, the dip tank 1 is formed in a box shape, an outlet 2 is formed in the side wall 1a of the dip tank 1, and a shielding wall 3 biased upward by a spring means 4 at a position to close the outlet 2.
Is provided so that it can move up and down. Further, a cutout portion 6 which is in close contact with the coating target member 5 is formed on the upper edge of the shielding wall 3.

On the other hand, the holding bowl 7 holds the opening 5a of the member 5 to be coated outside the dip tank so that the member 5 to be coated is cut into the notch 6
It is moved downward into the paint A from the position where it is in close contact with.

As the holding arm 7, for example, a structure in which an expansion type check is provided at the tip and the expansion is performed in the opening 5a of the member 5 to be coated to hold the member 5 to be coated can be used. .

[Action]

First, as shown in FIG. 5 (A), the holding arm 7 is made to support the member 5 to be coated, and subsequently, as shown in FIG. 5 (B), the opening 5a of the member 5 to be coated is the dip tank 1 The member 5 to be coated is pressed against the notch 6 so as to be positioned outside the side wall 1a. Then,
The shielding wall 3 moves downward against the elastic force of the spring means 4, and the notch 6
Moves so as to be below the coating liquid surface. here,
Up to a predetermined position of the member to be coated 5 is submerged in the paint, and painting is performed. In this case, as shown in FIG. 5 (C), the material to be coated 5 adheres only to the portion immersed in the coating material, and the coating material does not penetrate into the opening 5a and the interior of the material 5 to be coated.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

Before describing an embodiment of this coating method, the apparatus will be described first.

As shown in FIG. 1, the dip tank 1 is formed in a substantially elongated box shape, and a side wall 1a thereof is provided with an outflow port 2 and an overflow port 2a.

Furthermore, the side wall 1a receives the overflowing paint A.
1b is installed with an inclination.

A collection pipe 8 is connected to the gutter 1b.
Is connected to the inlet 9a of the concentration adjusting device 9.
On the other hand, a discharge pipe 10 is connected to the discharge port 9b of the concentration adjusting device 9, the end of which separates the corner 1e of the dip tank 1 into a triangle, and the bottom edge of the concentration adjustment device 9 does not contact the bottom plate 1d. It is provided.

Rails 1c and 1c are provided on both sides of the outlet 2, and a shield wall 3 is provided on the rails 1c and 1c so as to be watertight and vertically movable. The lower end of this barrier 3 and the dip tank 1
The spring means 4 is inserted between the bottom plate 1d and the bottom plate 1d so as to constantly urge the shield wall 3 in the upward direction.

With this apparatus, the coated member 5 to be coated is a bottomed cylinder having an opening 5a, and the cut-off wall 3 is formed with a notch 6 having the same sectional shape as the coated member 5. There is.

The opening 5a of the member to be coated 5 is held by the holding arm 7, and the opening 5a is placed outside the dip tank 1 and pressed against the notch 6.

The holding arm 7 can be inserted into the opening 5a, and has a chuck for expanding at the tip thereof. Further, the holding arm 7 can be freely operated in the vertical and horizontal directions by hydraulic pressure or the like.

<< Description of Coating Method >> An example of a coating method using the above apparatus will be described below with reference to FIG.

First, as shown in FIG. 5 (A), the holding arm 7 is made to support the member 5 to be coated, and subsequently, as shown in FIG. 5 (B), the opening 5a of the member 5 to be coated is the dip tank 1 A portion close to the opening 5a so as to be located outside the side wall 1a is pressed against the notch 6. Then, the shielding wall 3 moves downward against the elastic force of the spring means 4, and the notch 6 moves below the liquid surface of the coating material. Here, although the member 5 to be coated is immersed in the coating material, the downward movement of the shielding wall 3 is stopped at a predetermined position and the member 5 to be coated is coated. In this case, a small amount of the paint A flows out between the notch 6 and the member 5 to be painted, but is collected by the gutter 1b.

As described above, as shown in FIG. 5 (C), the painted member 5 has the paint adhered only to the part immersed in the paint, and the paint penetrates into the opening 5a and the inside of the member 5 to be painted. do not do.

Subsequently, the unpainted portion of the member 5 to be coated is coated in the same process. Then, after the drying process is completed, the member to be coated 5 is removed of unnecessary parts (FIG. 5 (D)) and moved to the next process such as coating.

In the coating process, the concentration of the liquid surface fluctuates due to the volatilization of the coating solvent, but the concentration is constant by circulating the coating material A in the dip tank 1 by the concentration adjusting device 9 described above. Can be converted.

While the paint is circulating, the paint is made to overflow from the overflow port 2a to make the liquid level constant. However, the liquid level of the overflow port 2a is set at the upper edge of the dip tank 1. Of course, this is not necessary if the height is the same.

Incidentally, during this circulation, a wave is generated by the paint discharged from the discharge pipe 10, but this wave is blocked by the wave preventing plate 11 to stabilize the liquid surface and improve the accuracy of separate coating of the coated members 5. It has become.

By mixing the defoaming agent in the coating material A, it is possible to smooth the liquid surface and further improve the accuracy of the separate coating interface.

<< Other Examples of Paint Method >> The apparatus and method for applying the coating by keeping the liquid surface side of the paint constant and lowering the coated member 5 side have been described above. The same effect can be obtained by bringing the relative position of the coating member 5 closer.

Hereinafter, a method and an apparatus for applying the coating material by raising the liquid surface side will be described with reference to FIGS. 6 and 7.

FIG. 6 shows a diaphragm 12 arranged in the dip tank 1 and an air compressor 13 for supplying or sucking air to the diaphragm 12, which is connected to the diaphragm 12 depending on the amount of air supplied to the diaphragm 12. The surface goes up and down.

On the other hand, the notch 6 is formed on the upper edge of the side wall 1a of the dip tank 1, and the member 5 to be coated is brought into pressure contact therewith.

In coating, the member 5 to be coated is pressed against the notch 6 in the contracted state of the diaphragm 12, and then air is supplied to the diaphragm 12 to raise the coating liquid surface to a predetermined height for coating.

FIG. 7 shows a dip tank 1 to which a paint tank 14 is connected, and a reversible pump 15 is provided between the paint tank 14 and the paint tank 14. The paint A in the paint tank 14 is transferred to the dip tank 1 or recovered to obtain a liquid. It moves the surface up and down. Since the other steps are the same as those described above, the description thereof will be omitted.

According to these two kinds of examples, the structure of the dip tank 1 can be simplified, and a large number of notches 6 are formed at the upper edge portion of the dip tank 1.
Since it is also easy to form, mass productivity can be expected.

〔The invention's effect〕

According to the present invention, since the member to be coated can be dip-coated, pretreatment such as masking is not necessary for the member to be coated, and even if the shape of the coated surface of the member to be coated is complicated It is possible to overflow paint. In addition, even when a bottomed tubular member to be coated having an opening is coated, the opening does not sink during coating, so that it is possible to coat only the outer surface of the member to be coated. You can save money.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an overall perspective view,
2 is a front view of the main part, FIG. 3 is a perspective view of the main part, FIG. 4 is a cross-sectional view of the main part, FIG. 5 shows the painting process, and FIGS. Sectional views, FIGS. 5 (C) and (D) are side views of the member to be coated, FIG. 5 (E) is a perspective view of the member to be coated, and FIGS. 6 and 7 are portions showing other embodiments. FIG. 1 ... Dip tank, 2 ... Outflow port, 3 ... Barrier wall, 4 ... Spring means, 5 ... Painted member, 6 ... Notch, 7 ... Holding arm, 1a ... Side wall, 5a ... …Aperture.

Claims (2)

[Claims] 1. A coating method in which a member 5 having an opening 5a is dipped in a coating material A in a dip tank 1 in a coating method in a notch 6 formed in an upper edge of the dip tank 1. The member 5 is closely held so that its opening 5a is located outside the side wall 1a of the dip tank 1, and then the relative position between the liquid surface of the coating material and the member 5 to be coated is brought close to the member 5 to be coated. The coating method in which the paint is submerged in paint A and painted. 2. A bottomed tubular member 5 to be coated having an opening 5a.
Is a box-shaped coating device, which has a box-like shape and has an outlet 2 formed on its side wall, and a shielding wall 3 urged upward by spring means 4 at a position where the outlet 2 is closed. Is provided so as to be movable up and down, and a dip tank 1 in which a notch 6 that is in close contact with the coated member 5 is formed on the upper edge of the barrier 3 and an opening 5a of the coated member 5 are provided outside the dip tank. A coating device comprising: a holding arm 7 for holding and lowering a member to be coated 5 into the paint A from a position in which the member to be coated 5 is brought into close contact with the cutout portion 6.