JP2670860B2 - Painting method and painting equipment - Google Patents

Description

TECHNICAL FIELD The present invention mainly relates to a coating method and a coating apparatus for coating a vehicle body with a coating material.

(Prior Art) Conventionally, as a device of this type, according to Japanese Patent Publication No. 52-30170, a coating booth in the front stage where a water-based paint is applied and a coating stage in which a water-based paint is applied on the coating film applied in the coating booth It is known that a flash-off chamber provided with a heat source for radiant heating is arranged between the booth and the booth.

On the other hand, when recoating the oil-based paint on the coating film of the oil-based paint, a setting zone is arranged between the coating booth of the first stage and the coating booth of the second stage, and the solvent of the oil-based coating applied in the first stage of the coating booth is Evaporate in the setting zone,
Next, the oil paint is repeatedly applied in the latter coating booth.

(Problems to be Solved by the Invention) By the way, if the coating line for applying the water-based paint and the coating line for applying the oil-based paint are provided separately, a large arrangement space is required. It is desirable to be able to apply oil paint.

Here, the heat source of the flash-off chamber is turned on when evaporating the water content of the water-based paint applied in the previous coating booth, and turned off when the solvent of the oil-based paint applied in the previous coating booth is evaporated. It is conceivable that the flash-off chamber is also used as the setting zone so that the water-based paint and the oil-based paint can be applied on the same painting line.

However, when the heat source is a far-infrared lamp, the lamp has a structure that radiates far-infrared rays by heating the ceramics and the like on the outer periphery. A waiting time until the radiation stops is required, and the flash-off process and the setting process take a long time, which lowers the productivity.

It is an object of the present invention to provide a coating method and a coating apparatus which can satisfy the above-mentioned needs and improve productivity.

(Means for Solving the Problem) In order to achieve the above invention, in the present invention, between the coating booth in the first stage and the coating booth in the second stage in which the coating material applied on the coating booth is repeatedly coated, Using a coating device in which a flash-off chamber equipped with a heat source for radiant heating is arranged,
In the method of performing coating by freely switching the coating material applied in the former coating booth to an aqueous coating and an oil coating, a far-infrared lamp is used as the heat source, the heat source is held in an ON state, and the oil coating is applied in the previous coating booth. When applying, the setting process of evaporating the solvent of the oil-based coating film is performed in a state where the front surface of the heat source is covered with a shielding plate in the flash-off chamber. A flash-off process of evaporating the water content of the water-based coating film is executed in the off-chamber with the front surface of the heat source opened.

Further, the apparatus of the present invention comprises a flash-off chamber provided with a heat source for radiative heating, between a coating booth in the former stage and a coating booth in the latter stage in which paint is applied over the coating film applied in the coating booth. In the coating apparatus, the heat source is composed of a far-infrared lamp, and the reflector of the heat source is reversible between a shielded state located in front of the heat source and an irradiation state located behind the heat source.

(Operation) When the water-based paint is applied in the previous painting booth, the shield plate is switched to the state where the front of the heat source is opened to evaporate the water content of the water-based paint, and when the oil-based paint is applied, the shield plate is used as the heat source. The solvent of the oily paint is evaporated by switching to a state where the front surface of the is covered.

Therefore, in order to perform the flash-off process of evaporating water and the setting process of evaporating the solvent by switching between the state in which the front surface of the heat request is covered and the state in which the front surface is open while the heat source is on. , It becomes unnecessary to increase the time until the emission of far infrared rays is stopped or until the emission is stopped, and the time required for the flash-off process and setting process can be shortened.

Further, by configuring the heat source with a far-infrared lamp, the far-infrared rays enter the inside of the coating film, so that the coating film can be efficiently heated and the time of the flash-off process can be shortened.

Further, by making the reflector of the heat source reversible between the shielded state positioned in front of the heat source and the irradiation state positioned behind the heat source, the reflector can also be used as the shield plate, so that the number of parts can be eliminated.

In addition, a coating booth may be provided with a coating device for water-based paint and a coating device for oil-based paint, and the coating device may be used to coat the vehicle body with the water-based paint and oil-based paint. If two coating devices for the paint and the oil-based paint are provided, the interior of the coating booth becomes complicated, and the equipment cost increases.

However, such a problem can be solved by providing a common coating device for coating the water-based paint and the oil-based paint in the coating booth.

(Example) With reference to FIG. 1 to FIG. 3, (1) is a pre-stage coating booth, (2) is a post-stage coating in which the coating film applied in the coating booth (1) is overlaid with a coating material. Shown is a booth, a flash-off chamber (4) equipped with a far-infrared lamp (3) as a heat source for radiant heating between the coating booths (1) and (2), the coating booth (1) at the preceding stage and the flash-off. Air curtain zones (5) and (5) between the chamber (4) and between the flash-off chamber (4) and the coating booth (2) at the latter stage, respectively.
And a shielding plate (6) was provided in the flash-off chamber (4).

The far-infrared lamps (3) are mounted in large numbers on both sides and the upper surface of a support frame (7) provided in the flash-off chamber (4). It was possible to irradiate from.

Further, the shielding plate (6) is made of a mirror-finished stainless steel plate, and is movably provided along a rail (8) laid in the flash-off chamber (4), and is provided at the bottom of the flash-off chamber (4). An arm piece (11) fixed to the shield plate (6) provided on an endless chain (10) driven by a motor (9) is connected to the endless chain (10), and thus the shield plate (6) is connected. When the motor (9) moves the shield plate (6) to the inside of the support frame (7) to cover the front surface of the far-infrared lamp (3), the shield plate (6)
Is moved to the outside of the support frame (7) so that the front surface of the lamp (3) can be opened.

In the drawing, (6a) shows a hole formed in the shielding plate (6) for weight reduction.

Further, each of the coating booths (1) and (2) may be provided with a coating device for the water-based paint and a coating device for the oil-based paint so that the water-based paint and the oil-based paint can be coated by these coating devices. If the coating device for the water-based paint and the coating device for the oily material are provided in each of the coating booths (1) and (2), the inside of the coating booths (1) and (2) becomes complicated and the equipment cost increases.

So, in an Example, each said coating booth (1) (2)
In addition, a common coating device (12) for water-based coating and oil-based coating was installed so that equipment cost could be reduced.

As shown in FIG. 4, the coating device (12) is formed by connecting a first manifold (15) to a coating head (13) attached to a coating robot via a communication passage (14). A second manifold (17) is connected to 15) via a supply pipe (16), and a plurality of water-based paint introduction pipes (18) and oil-based paint introduction pipes (19) of the second manifold (17) are used for water The paint and the oil-based paint were selectively introduced so that the common coating head (13) could be used for the color change coating using the water-based paint and the oil-based paint.

More specifically, the first manifold (15) includes:
A passage (15a) in the manifold (15) connecting the supply pipe (16) to the communication passage (14) and a drain passage (2 to the outside).
0) and a switching valve (21) which is switchably connected to the air pipe (23) and the water pipe (24) in the passage (15a) via the first cleaning valve (22). A cleaning pipe consisting of the hydrophilic solvent pipe (25) and the solvent pipe (26) was connected.

The first cleaning valve (22) includes an air valve (22a) attached to the first manifold (15), a solvent valve (22b), and an opening / closing valve (22).
c) and the opening / closing valve (22c) through the cleaning pipe (22d)
It is composed of a water valve (22f) attached to a cleaning valve manifold (22e) connected to and a hydrophilic solvent valve (22g). During the painting operation, the first cleaning valve (22) is closed and the switching valve (22 twenty one)
To the passage (15a) side, the paint is led to the communication passage (14) through the passage (15a), and the switching valve (21) is changed to the drain passage (20) side during the cleaning work. 1
The cleaning liquid introduced to the drain passage (2) is introduced into the drain passage (2).
0) and open to the air valve (22a) to open the passage (15
a) and the paint in the communication passage (14) are extruded to the application head (13) side, and further, the valves (22b) (22) of the first cleaning valve (22).
f) Open (22g) sequentially, and pass the cleaning liquid through the passage (15a) in the order of solvent, hydrophilic solvent, water for oil paint and water, hydrophilic solvent, solvent for water paint. It was led to the communication passageway (14) through the cleaning.

Each second manifold (17) has a paint inlet pipe (18).
A selection valve (27) for switchingably connecting the (19) to the return pipe (18a) (19a) and the passage (17a) in the second manifold (17) connected to the supply passage (16) is attached. Further, the same washing pipe as above was connected to the passage (17a) via the second washing valve (28).

The second cleaning valve (28) is an air valve (28a) attached to the second manifold (17), a solvent valve (28b), and an opening / closing valve (28).
c) and the opening / closing valve (28c) via the cleaning liquid pipe (28d)
It is composed of a water valve (28f) attached to a washing valve manifold (28e) connected to the and a hydrophilic solvent valve (28g), and one selection valve (27) corresponding to a predetermined color of the water-based or oil-based paint at the time of painting. ) To the passage (17a) side and paint is applied to the passage (17a).
The cleaning liquid is guided to the supply (16) via a), and at the time of cleaning, the selection valve (27) is switched to the return pipes (18a) (19a) side to return the paint to the supply source and the second cleaning valve (28). ) Of each valve (28a) (28b) (28f) (28g), the passage (15a) of the first manifold (15) and the communication passage (14) are sequentially opened in the same order as the washing, and the supply passage ( The air and the cleaning liquid were supplied to 16) to clean them.

Thus, the coating device (1
When the water-based paint is applied by 2), the shielding plate (6) is switched to a state where the front surface of the far infrared lamp (3) is opened, and the far-infrared heating is performed in the flash-off chamber (4) so that the water content of the coating film is reduced. Evaporate the valve, then paint booth in the second stage (2)
In this case, when the water-based or oil-based paint is applied repeatedly, and when the oil-based paint is applied by the application device (12) in the previous stage of the coating booth (1), the shield plate (6) is placed in front of the far infrared lamp (3). After changing to a covered state, a setting step of leaving the coating film in the flash-off chamber (4) at room temperature to evaporate the solvent of the coating film was performed, and then a water-based or oil-based paint was repeatedly applied in the subsequent coating booth (2).

Although the flash-off chamber (4) is provided with the shield plate (6) in the above embodiment, the reflector (29) of each far-infrared lamp (3) can also be used as the shield plate.

That is, each of the reflectors (29) is axially attached to the outer periphery of the far-infrared lamp (3) at the end, as clearly shown in FIGS. 5 to 7, and a support for mounting each of the far-infrared lamps (3). The air cylinder (30) is attached to the frame (7), and the operating rod (32) is engaged with the pin (31) protruding from each reflector (29) so that the rod (32) is attached to the cylinder. It is connected to the piston rod of (30), and thus the operation of the cylinder (30) causes each reflector (29) to be in a shielded state (shown in phantom in FIG. 7) positioned in front of the far-infrared lamp (3). The irradiation state (the state shown by the solid line in FIG. 7) positioned on the back side of the far-infrared lamp (3) can be reversed.

If the transport conveyor of the coating line breaks down during the coating process and it stops, flash off by switching the shield plate (6) and reflector (29) to cover the front of the far-infrared lamp (3). This is advantageous because it can prevent the heating of the vehicle body of the room (4).

(Effect of the Invention) As described above, according to the invention of claim 1, the flash-off step of evaporating the water content of the aqueous coating film and the setting step of evaporating the solvent of the oily coating film can be performed in the same coating line. In addition to being able to efficiently heat the coating film to the inside, there is no need to wait for the far infrared radiation to start or stop, which reduces the time required for the flash-off process and setting process. You can improve the property.

According to the invention of claim 2, in addition to having the same effect as described above, the reflector of the heat source can also be used as the shielding plate, and the number of parts can be reduced, and according to the invention of claim 3, the equipment cost of the coating booth can be reduced. There is an effect that the number can be reduced and the arrangement space of the coating device is also advantageous.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a coating apparatus used for carrying out the method of the present invention, FIG. 2 is a cutaway front view of a main portion thereof, FIG. 3 is a perspective view of the main portion thereof, and FIG. 4 is a coating apparatus. Explanatory diagram of the fifth
FIG. 6 is a cutaway front view of an essential part showing another embodiment, and FIG.
Fig. 7 is a sectional view taken along the line VI-VI in Fig. 7, and Fig. 7 is a front view of essential parts showing its operating state. (1) (2) …… Coating booth (3) …… Far infrared lamp (heat source) (4) …… Flash-off chamber (6) …… Shield plate (12) …… Coating device (29) …… Reflector

Claims (3)

(57) [Claims] 1. A coating comprising a flash-off chamber provided with a heat source for radiative heating, disposed between a coating booth at a first stage and a coating booth at a second stage where paint is applied over the coating film applied in the coating booth. In the method of performing coating by using the apparatus to switch the coating material applied in the former coating booth between water-based coating and oil-based coating, a far-infrared lamp is used as the heat source, the heat source is held in the ON state, and the coating of the first stage is performed. When the oil-based paint was applied in the booth, the setting step of evaporating the solvent of the oil-based paint film was performed in the flash-off chamber while the front surface of the heat source was covered with the shielding plate, and the water-based paint was applied in the previous paint booth. In this case, the coating method is characterized in that a flash-off step of evaporating the water content of the water-based coating film is performed in a flash-off chamber with the front surface of the heat source opened. 2. A flash-off chamber provided with a heat source for radiative heating is provided between a coating booth in the front stage and a coating booth in the rear stage in which paint is applied over the coating film applied in the coating booth. In the coating apparatus, the heat source is composed of a far-infrared lamp, and the reflector of the heat source is reversible between a shielded state positioned in front of the heat source and an irradiation state positioned behind the heat source. Coating equipment. 3. The coating apparatus according to claim 2, wherein a common coating device for coating the water-based paint and the oil-based paint is provided in at least the preceding paint booth of the both paint booths.