JPH1157606A - Separate coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separate coating method by which it is possible to shorten operating process without depending upon a masking procedure and increase coating deposition efficiency and further, prevent coating dust from flying in a method for finishing the coat in two or more tones with a parting line as a boundary. SOLUTION: In a coating method by which a coating of a given coat color 1 is applied to the entire face of an object to be coated and then a coating of a different coat color 2 from the coat color 1 is applied on the coat color 1 at a specified part of the entire face, a parting line is formed by applying the coating of the coat color 2 with the help of a coating gun tilted at an angle of (θ/2) deg. or more in such a manner that the discharge aperture of the gun is orientated to the specified part from the perpendicular of the parting part at the specified part. The coating gun to be used is of a two-fluid nozzle type with such a performance that the spray pattern open angle θ is within the range of 30 deg. and the velooity of atomized particle on a face to be coated is 20m/s or more which indicates excellent rectilinear propagation properties.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method which finishes at 2 tons or more at a parting line, has a high coating efficiency, does not scatter paint dust, does not require masking, and has a work process. The present invention relates to a separate coating method capable of shortening the coating time. INDUSTRIAL APPLICABILITY The method of the present invention can be used for separately painting articles in various fields, and is particularly useful for a separately painting process for a vehicle or an automobile body.

[0002]

2. Description of the Related Art Conventionally, in a method of separately painting a vehicle or an automobile into two or more tones, as shown in FIG. 2, first, the whole object is coated with a first coating color (1). After spray coating and baking, the portion (A) constituting the first coating color is subjected to masking at the time of finishing, and a coating material having a second coating color (2) different from the first coating color is masked. A method of spray painting and baking the uncoated portion (B) to finish by removing the masking, or as shown in FIG. 3, applying a paint of the paint color (1) to the work 2 using the paint gun 4. At this time, a method of forming an air curtain by an air flow to minimize the scattering of dust near the parting line, masking the coating surface of the coating color (1), and coating the coating of the coating color (2) Etc. are known.

[0003] However, these methods have a problem that a great deal of man-hour is required for attaching and detaching the masking. In the latter method, paint dust cannot be completely suppressed by the air flow, and the paint sticks out of the parting line. There was a problem that would.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have formed a parting line using a specific coating gun, and the other parts from a close distance under specific conditions. The present inventors have found that by coating, paint dust does not scatter even without masking and can be applied only to a required surface, and arrived at the present invention.

[0005] That is, the present invention provides: "1. After applying a paint of the coating color (1) over the entire surface of the object to be coated, a predetermined portion thereof has a coating color (2) different from the coating color (1).
In the coating method in which the paint is applied repeatedly, the predetermined parting portion has good straightness with a spray pattern opening angle θ within 30 ° and a spray particle velocity on the surface to be coated of 20 m / s or more. Using a two-fluid nozzle coating gun, the coating gun is inclined at an angle of (θ / 2) ° or more so that the discharge port of the gun is directed to a predetermined portion from the perpendicular of the parting-off part, and the coating color (2)
A distinctive coating method, wherein a parting line is formed by applying a paint.

[0006] 2. The two-fluid nozzle coating gun having a caliber of 0.2 to 1.5 mm is used for a part other than the parting part of the predetermined part, with a discharge rate of 3 to 150 cc / min and a coating distance of 30 to 8.
2. The method according to claim 1, wherein the paint of the paint color (2) is applied under the condition of 0 mm.

[0007] 3. Using a bell type coating gun having a bell diameter of 25 to 50 φ, a discharge rate of 10 to 100 cc / min and a coating distance of 30 to 10
2. The method according to claim 1, wherein the paint of the paint color (2) is applied under the condition of 0 mm.

[0008] 4. 4. When the paint of the paint color (2) is applied over a predetermined portion, air is blown to the other portion to prevent the paint dust of the paint color (2) from scattering, so that the paint is separated according to any one of the items 1 to 3. Painting method.

[0009] 5. One part of the object is coated with the coating color (1), and the spray pattern opening angle θ is 3 in the parting-off part.
Using a two-fluid nozzle coating gun with good linearity, within 0 ° and a spray particle velocity of 20 m / s or more on the surface to be coated, the discharge port of the gun is one part from the perpendicular to the parting part (Θ / 2) ° or more so as to form a parting line of the coating color (1), and after coating the part other than the parting part, further apply the other part of the object to be coated. Paint color (2) on the part and spray pattern
Using a two-fluid nozzle coating gun with a good straightness, the opening angle θ of which is within 30 ° and the spray particle velocity on the surface to be coated is 20 m / s or more, the spraying of the gun from above the perpendicular line of the parting part. The method is characterized in that the paint is applied by inclining at an angle of (θ / 2) ° or more so that the outlet is directed to the other part, and a parting line of the paint color (2) is formed, and the part other than the parting part is painted. Separate coating method.

[0010] 6. For the parts other than the parting part, 0.2
6. The coating method according to claim 5, wherein the coating is performed using a two-fluid nozzle coating gun having a discharge rate of 3 to 150 cc / min and a coating distance of 30 to 80 mm.

7. For parts other than the parting part, the bell diameter is 25.
Using a bell-type coating gun with a diameter of
Item 6. The method for separately coating according to Item 5, wherein the coating is performed under conditions of 100 cc / min and a coating distance of 30 to 100 mm. ”.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, as shown in FIG. 1, a spray gun 1 for coating a parting-off part has a spray pattern opening angle θ of 30 ° or less, preferably 10 ° or less, and a surface to be coated. Is a two-fluid nozzle coating gun having a good linearity with a spray particle velocity of 20 m / s or more, preferably 25 to 40 m / s.

The spray pattern opening angle .theta. Is adjusted by the shape and diameter of the air nozzle of the coating gun. If the opening angle .theta. Exceeds 30.degree. . On the other hand, if the speed at which the spray particles are applied to the surface to be applied is less than 20 m / s, the application efficiency is lowered and dust scattering is increased, which is not preferable.

The caliber of the two-fluid nozzle coating gun is 0.1 mm.
2 to 1.5 mm, preferably about 0.5 to 1.0 mm is appropriate. If the diameter of such a coating gun exceeds 1.5 mm, it is not preferable because sagging and tearing easily occur at a high discharge rate. Specific examples of the two-fluid nozzle coating gun include a marking gun (manufactured by Marktec, “Shot Marker S10”), an airbrush (Olympus “Peace Bon PB-408”), and Anest Iwata “HP-
C ").

In order to form a parting line by using the above-mentioned coating gun, the position of the discharge port of the coating gun is set to be perpendicular to the parting line, and the discharge port of the gun is to be set from the part perpendicular to the parting part. Spray coating is performed at an angle of (θ / 2) ° or more so as to approach the part. If the inclination is less than (θ / 2) °, the dust scatters to a portion other than the target portion, which is not preferable. When painting the parting-off part, air may be blown to a part other than the intended part to prevent the paint dust from scattering. Air blowing
By forming an air curtain toward a parting-off part using one or more air guns.

Other coating conditions for forming a parting line using the coating gun include a discharge rate of 3 to 50 cc / min and a coating distance of 10 to 70 cm. If the discharge amount is out of this range and it is small, the parting film cannot be formed, and if it is too large, sagging and pitting will easily occur, and if the coating distance is out of this range and it is distant, dust scattering may increase. Is not preferred.

As a coating gun for coating a part other than the parting part, a conventionally used two-fluid nozzle or bell type coating gun can be used. The diameter of the two-fluid nozzle coating gun is suitably about 0.2 to 1.5 mm. If the diameter exceeds 1.5 mm, sagging or burring easily occurs at a high discharge rate, which is not preferable. The bell diameter of the bell type coating gun is suitably about 25 to 50φ. If the bell diameter exceeds 50φ, the pattern width becomes wide and dust scattering increases, which is not preferable.

The conditions for coating the part other than the parting line using the two-fluid nozzle coating gun are as follows:
And a coating distance of 30 to 80 mm are appropriate, and the conditions for coating the part other than the parting line using the above-mentioned bell type coating gun are a discharge rate of 10 to 100 cc / min and a coating distance of 30 to 80 mm.
100 mm is appropriate. If the discharge amount exceeds the range, sagging or tearing tends to occur, and if the coating distance exceeds the range, dust scattering increases, which is not preferable.

The coating gun for coating the parting-off part and the coating gun for coating the other parts can be driven independently or in conjunction with each other. Further, a coating gun for coating a part other than the parting part can be used singly or plurally depending on an area to be coated, and can be subjected to pulse coating as needed.

[0020]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples.

Embodiment 1 FIG. 4 is an explanatory diagram based on a first embodiment of the present invention. The entire surface of the object 2 is coated with the paint of the coating color (1) using an electrostatic air spray gun (or an electrostatic bell coating gun),
The coating film 5 of the coating color (1) was formed.

After baking and drying, the coating film 5 of the coating color (1)
The paint of the paint color (2) is applied to the upper part of the two-tone paint.
For the coating of the parting part 6, a two-fluid nozzle coating gun 1 ("Pee-Pose PB-408") having a diameter of 0.8 mm and having a good straight running property.
Mold, manufactured by Olympos Co., Ltd., spray particle velocity 30 m / s) (hereinafter sometimes referred to as "parting-off gun"). The parting gun 1 has a spray pattern opening angle θ of about 10
°, the discharge port 7 of the parting gun 1 was positioned on the perpendicular line of the parting part 6, and the parting gun body was inclined by about 5 ° so that the discharge port 7 of the gun was directed to the coating site. In this state, coating was performed under the conditions of a coating distance of 40 mm and a discharge rate of 30 cc / min to form a parting line of the coating color (2).

In coating the parting portion 6, an air curtain 8 was formed using the air gun 3 toward the parting portion 6 to prevent the paint dust from scattering on the coating film 5 of the coating color (1).
The air discharge rate was about 200 liters / minute.

The part 9 other than the parting part 6 has a diameter of 1.2.
using a plurality of two-fluid nozzle coating guns 4 ("Atmax Nozzle", manufactured by Atmax Co., Ltd.)
The coating was performed under the conditions of 0 mm and a discharge rate of 20 cc / min per gun to form the coating film 10 of the coating color (2). Also, instead of a two-fluid nozzle coating gun, a bell type coating gun ("Robobell", manufactured by Lansberg) with a 25 mm bell diameter was used.
The coating may be performed under the conditions of a coating distance of 50 mm and a discharge rate of 50 cc / min to form the coating film 10 of the coating color (2).

As described above, the closing gun 1, the air gun 3,
And the paint gun 4 is linked, and the paint of the paint color (2) is
A predetermined part on the coating film 5 of the coating color (1) is painted,
The upper part was finished with a coating color (1) and the lower part was finished with a two-tone coating color (2). The parting part is also sharply formed and there is no scattering of paint dust. If necessary, the paint color (1) or the paint color (2)
A different coating color (3)
Can be separately applied by the same operation as the application of the above-described paint color (2). If necessary,
A clear coating may be applied to the entire surface of the object after the separate coating.

Embodiment 2 FIG. 5 is an explanatory diagram based on a second embodiment of the present invention. First, a paint of the paint color (1) is applied below the object 2 to be coated.

The coating of the parting part 6 is performed by a two-fluid nozzle coating gun 1 (manufactured by Marktec Co., Ltd., shot marker S10, spray particle velocity 30 m / m) having a diameter of 1.0 mm and a good linearity.
s) (hereinafter sometimes referred to as “parting-off gun”). The parting gun 1 has a spray pattern opening angle θ.
Is about 10 °, and the discharge port 7 of the parting gun 1 is positioned on a perpendicular line of the parting part 6, and the parting gun body is inclined by about 5 ° so that the discharge port 7 of the gun is directed to the coating part. In this state, coating was performed under the conditions of a coating distance of 20 mm and a discharge rate of 30 cc / min to form a parting line of the coating color (1).

At the time of coating the parting part 6, an air curtain 8 was formed using the air gun 3 toward the parting part 6 to prevent the paint dust from scattering on the surface of the workpiece 2. The air discharge rate was about 200 liters / minute.

The portion 9 other than the parting part has a diameter of 1.0 m.
m using a plurality of two-fluid nozzle coating guns 4 (“SGA-2”; manufactured by Anest Iwata) at a coating distance of 50 mm and a discharge rate of 50 cc / min. Was formed.

As described above, the closing gun 1, the air gun 3,
And the paint gun 4 is linked, and the paint of the paint color (1) is
After a predetermined portion of the object 2 is coated, it is left for about one minute, and then a coating color (2) is applied above the object 2.
The coating of the parting-off part 11 and the part 12 other than the parting-off part using the paint of the paint color (2) and the air spraying are performed using the paint color (1).
The coating operation was performed in the same manner as in the above-mentioned coating to form the coating film 10 of the coating color (2).

As described above, two kinds of paints were applied to predetermined portions, respectively, and the upper part of the object 2 was painted with a paint color (1) and the lower part thereof was painted with a two-tone paint color (2). The parting part is also sharply formed and there is no scattering of paint dust. If necessary, a paint having a paint color (3) adjacent to the paint color (1) or the paint color (2) may be used, and a paint similar to the paint of the paint color (2) may be used. Can be painted separately by operation. Further, if necessary, a clear coating may be applied to the entire surface of the object after the separate coating.

[0032]

As described above, according to the present invention, the scattering of dust at the parting-off portion can be prevented, so that the masking step is not required and the working steps can be greatly reduced. In addition, since the coating is performed at a short distance, a high coating efficiency can be obtained, and the coating can be performed only on the necessary parts, so that the amount of the coating used can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a spray pattern opening angle θ of a coating gun.

FIG. 2 is an explanatory diagram of a separate coating method having a conventional masking step.

FIG. 3 is an explanatory view of a separate coating method having a conventional air spraying step.

FIG. 4 is an explanatory diagram based on a first embodiment of the present invention.

FIG. 5 is an explanatory diagram based on a second embodiment of the present invention.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Parting-off gun 2 Object to be coated 3 Air gun 4 Painting gun 5 Coating color (1) coating 6,11 Parting-off part 7 Gun discharge port 8 Air curtain 9,12 Parts other than parting-off part 10 Paint color (2) Paint film

Claims (7)

[Claims] 1. A coating method in which a coating material having a coating color (1) is applied over the entire surface of an object to be coated, and then a coating material having a coating color (2) different from the coating color (1) is applied to a predetermined portion of the coating material. In this case, the parting-off part of the predetermined part is formed by a spray pattern opening angle θ of 3
Using a two-fluid nozzle coating gun with good linearity, which is within 0 ° and the spray particle velocity on the surface to be coated is 20 m / s or more, the discharge port of the gun is set at a predetermined position from the perpendicular of the parting part. To an angle of (θ / 2) ° or more so that
A separate coating method, wherein a parting line is formed by applying a paint of the paint color (2). 2. A two-fluid nozzle coating gun having a diameter of 0.2 to 1.5 mm is used for a part other than a parting part of a predetermined part, using a two-fluid nozzle coating gun to discharge at a rate of 3 to 150 cc / min and a coating distance of 30 to 8.
2. The method according to claim 1, wherein the coating of the coating color (2) is applied under a condition of 0 mm. 3. A discharge rate of 10 to 100 cc / min and a coating distance of 30 to 10 cc / min.
2. The method according to claim 1, wherein the coating of the coating color (2) is applied under a condition of 0 mm. 4. The method according to claim 1, wherein, when the paint of the paint color (2) is repeatedly applied to a predetermined portion, air is blown to other portions to prevent the paint dust of the paint color (2) from scattering. Coating method described in section. 5. A paint of paint color (1) is applied to one part of the object to be coated, and the spray pattern opening angle θ is 3 at the parting-off part.
Using a two-fluid nozzle coating gun with good linearity, within 0 ° and a spray particle velocity of 20 m / s or more on the surface to be coated, the discharge port of the gun is one part from the perpendicular to the parting part (Θ / 2) ° or more so as to form a parting line of the coating color (1), and after coating the part other than the parting part, further apply the other part of the object to be coated. Paint color (2) on the part and spray pattern
Using a two-fluid nozzle coating gun with a good straightness, the opening angle θ of which is within 30 ° and the spray particle velocity on the surface to be coated is 20 m / s or more, the spraying of the gun from above the perpendicular line of the parting part. The method is characterized in that the paint is applied by inclining at an angle of (θ / 2) ° or more so that the outlet is directed to the other part, and a parting line of the paint color (2) is formed, and the part other than the parting part is painted. Separate coating method. 6. A part other than the parting-off part has a diameter of 0.2.
The coating method according to claim 5, wherein the coating is performed using a two-fluid nozzle coating gun having a discharge amount of 3 to 150 cc / min and a coating distance of 30 to 80 mm. 7. A part other than the parting part has a bell diameter of 25.
Using a bell-type coating gun with a diameter of
The method according to claim 5, wherein the coating is performed under conditions of 100 cc / min and a coating distance of 30 to 100 mm.