JPH0985143A - Coating method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating method, which has flexibility in application, is inexpensive and capable of suppressing the lowering of productivity and the increase of material cost and forming a parting line with a high quality coating surface, and the device. SOLUTION: This coating device has a spray gun 1 for coating, which is provided with a spray nozzle 2 arranged at a position P1 above the boundary PL of a coating region A of a material W to be coated and inclined to the coating region A, and a coating material suction device 4, which is provided with an opening part 5 arranged at a position P3 deviated from a position P2 directly under the spray nozzle 2 and facing the coating region A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and a coating apparatus suitable for coating an object to be coated, which has a coating unnecessary portion which is inconvenient for the coating to adhere to.

[0002]

2. Description of the Related Art When a coating surface of a plurality of colors is formed on a surface to be coated, a color boundary is formed between adjacent coating surfaces of different colors. This color boundary is generally called a parting line,
When painting multiple types of colors, quality control of this parting line is important.

Therefore, various coating methods and coating apparatuses have been conventionally developed in order to prevent the dripping of the coating material and the generation of the coating material pool and to form a high quality parting line that clearly separates the adjacent areas from each other. There is.

The coating apparatus shown in FIG. 3 is an example of a coating apparatus for forming a coating surface having a parting line, and is disclosed in Japanese Patent Laid-Open No.
No. 0-19063.

A spray nozzle 12 having a special structure (a part of the spray range is biased to be biased) is provided at the paint spraying portion of the spray gun 11 for spraying of this spraying device. By coating with, the parting line is formed on the boundary of the coating area of the object W to be coated.

On the other hand, FIG. 4 shows an example of a method for forming a parting line at the boundary of the coating area using a masking tape, which is carried out, for example, by coating the body sill portion of an automobile.

In this method, as shown in FIG. 4 (a), an undercoat and an intermediate coat are applied to a panel part W which is an object to be coated to form an underlayer 21 and an intermediate layer 22, and subsequently under a wet condition, A black coating layer 23 is formed by applying sill black coating. When the coated surface dries, as shown in Fig. 4 (b),
The end of the heat-resistant masking tape 24 is positioned along the parting line to cover the portion to be left as the black coating layer. After the masking step is completed, as shown in FIG. 4C, the vehicle body coating, that is, the topcoat layer 25 is formed, and the coated surface is dried. After the completion of the drying, the masking tape 24 is peeled off, as shown in FIG.
As shown in (d), a parting line PL is formed at a desired position.

[0008]

However, in the coating apparatus shown in FIG. 4, since the coating nozzle of the coating spray gun needs a spray nozzle having an expensive special structure, the apparatus cost increases. I have a problem. Moreover, since the spray nozzle has a special structure, it is relatively poor in versatility.

The coating method shown in FIG. 5 requires a step of covering the non-painted area with a masking tape and a step of peeling off the tape, which has the problem of increasing the number of steps and lowering the productivity. Further, the use of the masking tape also raises the material cost.

Further, a poor parting due to floating of the masking tape due to poor adhesion, the coating film being turned off by being carried by the masking tape to be peeled off, the masking tape adhesive remaining after peeling off the masking tape, or the masking tape peeling surface There is also a possibility that problems may occur due to secondary factors associated with the use of masking tape such as coloring and the generation of tape marks.

On the other hand, it is known that even a coating spray gun equipped with a general spray nozzle can form a parting line by inclining and coating. In this case, as shown in FIG. As described above, the quality of the coating film surface is deteriorated due to the dripping of paint and the accumulation of paint.

The present invention has been made in view of the above problems of the prior art, has general versatility, is inexpensive, and can suppress a decrease in productivity and an increase in material cost. An object of the present invention is to provide a coating method and a coating apparatus capable of forming a parting line while having a high quality coating surface.

[0013]

SUMMARY OF THE INVENTION To achieve the above object, the present invention is directed to a coating area of an object to be coated by inclining a spray nozzle of a coating spray gun relative to the coating area. At the same time as spraying, the sprayed paint is sucked to remove the excess paint.

Further, the spray nozzle is arranged at a position above a boundary line of the coating area, and the sprayed and scattered paint is sucked from a position deviated from a position directly below the spray nozzle. It is characterized by

Further, according to the present invention for achieving the above object, there is provided a spray gun for painting having a spray nozzle which can be tilted relatively to a coating area of an object to be coated, and a spray gun sprayed from the spray nozzle. And a paint suction means for sucking the existing paint.

Further, the spray nozzle is arranged at a position above a boundary line of the coating area, and the paint suction means is arranged at a position deviated from a position directly below the spray nozzle. And

[0017]

The present invention thus constructed operates as follows for each structure.

According to the first aspect of the present invention, the spray nozzle is tilted relative to the coating area to spray the paint, and at the same time, the excess amount of the sprayed paint is removed. Therefore, even if a parting line is formed,
It is possible to prevent the dripping of paint and the occurrence of paint stagnation in the painting area.

According to the second aspect of the present invention, the spray nozzle is arranged at a position above the boundary line of the coating area, and an excessive amount of the sprayed and scattered paint is located directly below the spray nozzle. Since the liquid is sucked from the position deviated from the deviation, the excessive amount of the sprayed and scattered paint can be efficiently removed.

According to the third aspect of the present invention, there are provided a spray nozzle that is tiltable relative to the coating area, and a paint suction means that sucks an excessive amount of the sprayed and scattered paint. Therefore, even if the parting line is formed, it is possible to prevent the paint from dripping and the paint from being accumulated in the coating area.

In the structure according to the fourth aspect, the spray nozzle is arranged at a position above the boundary line of the coating area, and the paint suction means is displaced from the position directly below the spray nozzle. Since it is located at, the excess amount of paint that is sprayed and scattered is efficiently removed.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram for explaining an embodiment of a coating apparatus according to the present invention, FIG. 1 (a) shows a side view of the coating apparatus during coating, and FIG. 1 (b) shows FIG. 2 is a schematic diagram showing the positional relationship of the members forming the coating apparatus, and FIG. 2 is a diagram showing changes in the coating film pattern in the coating region depending on whether or not the coating apparatus of FIG. 1 is applied. 3 and 4
The same reference numerals are given to members in common with.

As shown in FIG. 1A, the coating spray gun 1 of the coating apparatus according to the embodiment of the present invention is tilted with respect to the coating area A of the object W to be coated, and the boundary of the coating area A is inclined. It has a general-purpose standard spray nozzle 2 located above the line PL. Reference numeral 5 is a hose connection portion for connecting an air supply unit for dispersing and spraying the paint.

On the other hand, a paint suction device 4 which is a paint suction means for removing an excessive amount of the sprayed and scattered paint.
Has a diameter of 7 to 15 facing the coating area A of the object W to be coated.
It has an opening 5 which is mm. Further, as shown in FIG. 1B, the paint suction device 4 is arranged at a position P3 which is deviated from a position P2 immediately below the arrangement position P1 of the spray nozzle 2.

The detailed arrangement condition set is that the distance L3 between the discharge end 21 of the nozzle 2 and the surface of the object to be coated is 1.
0 mm, the distance L1 between the end 51 of the opening 5 of the paint suction device 4 and the surface of the object to be coated is 5 to 10 mm, and the position P4 where the axis of the nozzle 2 and the opening 5 of the paint suction device 4 intersect is opposed. The position P5 on the surface of the object to be coated and the end 51 of the paint suction device 4
The distance from the position P6 on the surface of the object to be coated opposite to is 60
mm.

With respect to the horizontal line passing through the position P4 where the axes of the nozzle 2 and the opening 5 intersect, the inclination angle θ1 of the spray gun 1 for coating is 30 to 35 degrees, and the inclination angle θ2 of the paint suction device 4 is It is set to 45 to 75 degrees.

A paint supply unit including a pump unit, a pressure regulator, a temperature controller with a built-in heater, etc. is connected to the spray gun 1 for painting via a hose, and the paint is supplied from this paint supply unit. It A controller is connected to the paint supply unit, and the discharge pressure of the pressure regulator, the pulse interval that determines the discharge interval, and the holding temperature are controlled.

Further, in the opening 5 of the paint suction device 4, for example, negative pressure means for generating a negative pressure in the opening by sending air to the outside by rotational movement of the impeller or rotor or reciprocating movement of the piston. The air blower or the compressor is connected, and it is possible to suck the sprayed and scattered paint. Then, the sucked paint is finally introduced into the drain.

That is, the coating apparatus according to the present invention does not require an expensive spray nozzle having a special structure, and
A general or inexpensive blower or compressor can be applied as a suction device for the sprayed and scattered paint, so that the coating device is inexpensive and has versatility.

Next, the conditions for coating will be described.

The paint used in this coating device is IH
It has a viscosity equivalent to 20 to 30 seconds in an S viscosity cup. The coating conditions are a paint discharge pressure of 3 to 9 kg / cm ² and a gun moving speed of 300 to 800 mm / sec.

Here, it is sufficient that the amount of air sucked by the negative pressure means is equal to or more than the amount of air ejected from the coating spray gun.

For coating, first, the controller connected to the paint supply unit sets the above-mentioned coating conditions and spray gun control conditions.

Then, coating is performed while moving a spray gun driving means (not shown), for example, an arm of a coating robot to which the spray gun is attached. On this occasion,
Since the spray nozzle 2 of the spray gun 1 is inclined to the coating area A, even if a general-purpose standard spray nozzle is used, a clear parting line is formed at the top of the coating area A by the spray paint C1. PL can be formed.

On the other hand, the paint suction device 4 has a position P deviated from a position P2 immediately below the position P1 where the spray nozzle 2 is arranged.
Since it is arranged in No. 3, it is possible to efficiently remove the excessive spray paint C2 existing below that which causes the dripping of paint in the painting area and the occurrence of paint stagnation.

As a result, even when the present invention is applied, the coating film pattern in the coating area is as shown in FIG.
It is possible to form a high quality coating film surface without causing paint dripping or paint accumulation. Note that FIG.
(B) has shown the coating film pattern of the coating area at the time of forming a parting line with the spray gun for coating provided with the general spray nozzle.

Therefore, since a masking member for covering the non-painted area is unnecessary, it is possible to suppress a decrease in productivity due to an increase in the number of steps, and to eliminate the occurrence of defects due to secondary factors associated with the use of masking tape. Further, the material cost does not increase due to the use of the masking member.

The setting conditions are work environment, unpainted material,
It is desirable to make appropriate changes in response to changes in the paint to be applied.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the claims.

For example, the sucked excess paint is finally introduced into the drain and discarded, but it can be reused by removing the mixed foreign matter or adjusting the viscosity. .

[0042]

As described above, according to the present invention, the following effects can be obtained by the configurations described in the respective claims.

In the structure described in claim 1, the spray nozzle is inclined relative to the coating area to spray the paint, and at the same time, the excess amount of the sprayed paint is removed. Therefore, even if the parting line is formed, it is possible to prevent the paint from dripping or from accumulating in the paint region.

Therefore, an expensive spray nozzle having a special structure is not required, and the coating apparatus is inexpensive and versatile. Further, since a masking member for covering the non-painted area is unnecessary, it is possible to suppress a decrease in productivity due to an increase in the number of steps and eliminate the occurrence of defects due to secondary factors associated with the use of the masking member. Further, the material cost does not increase due to the use of the masking member.

According to the second aspect of the present invention, the spray nozzle is arranged at a position above the boundary line of the coating area, and an excessive amount of the sprayed and scattered paint is located directly below the spray nozzle. Since the liquid is sucked from the position deviated from the deviation, the excessive amount of the sprayed and scattered paint can be efficiently removed.

Therefore, since it is possible to more efficiently prevent the paint from dripping and the paint from accumulating in the coating area, it is possible to form a higher quality coating film surface.

According to the third aspect of the present invention, there are provided a spray nozzle that is tiltable relative to the coating area and a paint suction means that sucks an excess amount of the sprayed and scattered paint. Therefore, even if the parting line is formed, it is possible to prevent the paint from dripping and the paint from being accumulated in the coating area.

Therefore, an expensive spray nozzle having a special structure is not required, and the coating apparatus is inexpensive and versatile. Further, since a masking member for covering the non-painted area is unnecessary, it is possible to suppress a decrease in productivity due to an increase in the number of steps and eliminate the occurrence of defects due to secondary factors associated with the use of the masking member. Further, the material cost does not increase due to the use of the masking member.

In the structure described in claim 4, the spray nozzle is arranged at a position above the boundary line of the coating area, and the paint suction means is displaced from the position directly below the spray nozzle. Since it is located at, the excess amount of paint that is sprayed and scattered is efficiently removed.

Therefore, since it is possible to more efficiently prevent the dripping of the paint and the accumulation of the paint in the coating area, it is possible to form a higher quality coating film surface.

[Brief description of drawings]

FIG. 1 is a conceptual diagram for explaining an embodiment of a coating device according to the present invention, FIG. 1 (a) is a side view of the coating device during coating, and FIG. 1 (b) is a coating device. It is the schematic showing the positional relationship of the member which comprises.

FIG. 2 is a diagram showing a change in a coating film pattern in a coating region depending on whether or not the coating device of FIG. 1 is applied.

FIG. 3 is a side sectional view showing an example of a conventional coating apparatus for forming a coating surface having a parting line.

FIG. 4 is a side sectional view showing an example of a conventional coating method for forming a coated surface having a parting line.

[Explanation of symbols]

 1, 11 ... Spray gun for painting, 2, 12 ... Spray nozzle, 4 ... Paint suction device, 5 ... Opening area, A ... Painting area C, C1, C2 ... Spray paint, PL ... Boundary (parting line), W ... The object to be coated.

Front page continuation (72) Inventor Tatsuo Tanaka 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd.

Claims (4)

[Claims] 1. A spray nozzle (2) of a spray gun (1) for coating is relatively inclined with respect to a coating area (A) of an object to be coated (W), so that the coating material (C) is applied to the coating area (A). ), The paint (C) that has been sprayed and scattered at the same time is sucked to remove the excess paint (C2). 2. The spray nozzle (2) is arranged at a position (P1) above the boundary line (PL) of the coating area (A), and the paint (C) which is sprayed and scattered,
The coating method according to claim 1, wherein suction is performed from a position (P3) deviated from a position (P2) directly below the spray nozzle (2). 3. A spray gun for painting (1) having a spray nozzle (2) which can be tilted relative to a coating area (A) of an object to be coated (W), and the spray nozzle (2).
And a paint suction means (4) for sucking paint (C) which is sprayed from and scattered. 4. The spray nozzle (2) is arranged at a position (P1) above the boundary line (PL) of the coating area (A), and the paint suction means (4) is provided at the spray nozzle (2). The coating device according to claim 3, wherein the coating device is arranged at a position (P3) deviated from the position (P2) immediately below 2).