JPH07108212A - Spray painting method - Google Patents

Abstract

PURPOSE:To form a uniform painted surface while reducing the scattering of paint and enhancing painting efficiency by shortening the distance from each of the paint jet orifices at each of the end parts of a painting surface and increasing the moving speed of spray guns and turning the paint jet orifices toward the central part of the painting surface to perform lap painting. CONSTITUTION:The distance L1 between the paint jet orifice 5 of a spray gun 1 and a painting surface 41 at the end part 31 of painting surfaces 41, 42 is made shorter than the distance L2 between the paint jet orifice 5 of the spray gun 1 and the painting surface at a part other than the end part 31 and the moving speed of the spray gun 1 at the end part 31 is increased to perform painting and, therefore, the width of the spray pattern applied to the painting surface 41 of the end part 31 is reduced and a necessary amt. of paint can be reduced. The aiming direction A1 of the paint spray orifice 5 of the spray gun 1 at the end part 31 is inclined toward the central part 32 of an object 3 to be painted from the end part 31 thereof and painting is applied from the end part 31 to the central part 32 to perform lap painting at the end part 31 and, therefore, the coating of the spray pattern 10 applied to the painting surface 41 of the end part 31 is distributed much on the side of the end part 31 and little on the side of the central part 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray coating method in which a spray gun is controlled to coat an object having a rectangular shape and a flat coating surface.

[0002]

2. Description of the Related Art Conventionally, as a coating device using a robot used for spray coating, as shown in FIG. 4, a spray gun 1 attached to an arm tip of a robot 2 is used. The spray gun 1 of this coating device
The robot 2 directs the object to be painted 3 onto the painted surface 4,
The paint is sprayed from the paint spray port of the spray gun 1 so that the painted surface 4 is painted. Reference numeral 13 is a spray pattern of the paint sprayed by the spray gun 1. A conventional coating method using such a spray coating apparatus is, as shown in FIG. 5, a distance L between the coating spray port 5 of the spray gun 1 and the coating surface 4, and a feed pitch P of the spray gun 1 in the width direction. While the spray gun 1 is moved in the direction of the arrow, the coating surface 4 of the coating object 3 is overcoated. In addition, 6 is a coating pattern of the paint. Thus, conventionally, the paint spray port 5 of the spray gun 1 is
Since the coating surface 4 of the coating object 3 is overcoated while the distance L between the coating surface 4 and the coating surface 4 is constant, the coating material in the shaded area 7 is scattered at the end of the coating object 3. Improvement of coating efficiency was hindered. In order to prevent this paint from scattering and to prevent the paint from adhering to the non-painted surface, a paint reservoir is provided to block part of the sprayed paint and to limit the coating range. The spraying part for spraying air is used as a coating robot 2 near the spray gun 1.
Japanese Patent Application Laid-Open No. 1-23722 discloses a method of restricting the scattering of paint by providing it at the tip of the. Further, as shown in FIG. 6, the distance LB between the paint spray port 3 of the spray gun 1 and the coating surface 4 at the end is the distance between the paint spray port 5 of the spray gun 1 and the coating surface 4 other than at the end. It is shorter than LA and the amount of paint sprayed at the end is smaller than the amount of paint sprayed at other than the end, the moving speed of the spray gun 1 is made faster, or the amount of paint sprayed is made smaller and the moving speed is made smaller. Japanese Patent Laid-Open No. 3-225764 discloses a method of reducing the scattering of paint by coating the edges at a high speed.

[0003]

However, in the above-mentioned conventional coating method, since additional means such as a blocking member for limiting the coating range is used as means for preventing the paint from scattering or improving the paint efficiency. The cost of adding this additional means is high. In addition, as shown in FIG. 6, when spray coating the end of the coating object 3,
As indicated by the shaded portion 12, there was a defect that a small amount of paint was still scattered.

The present invention has been made in view of the above problems, and provides a spray coating method capable of minimizing paint scattering, improving coating efficiency, and forming a uniform coating surface. The purpose is to

[0005]

In order to achieve the above object, the present invention makes a spray gun run on the coating surface of an object to be coated and sprays the coating material from a coating material spray port to coat the entire surface. In the spray coating method, the distance between the coating surface and the paint spray port at the end of the coating surface is changed between the end and the other end to shorten the distance at the end and move at the end. The speed is made higher than the moving speed other than the end part, and further, the target direction of the paint spray port of the spray gun is applied from the end part to the center part of the object to be coated so that the coating is repeated at the end part. It is characterized by painting.

[0006]

According to the spray coating method of the present invention, the distance between the paint spraying port at the end and the coating surface is made shorter than the distance between the paint spraying port of the spray gun and the coating surface other than at the end. Since coating is performed at a speed higher than the moving speed of the spray gun at the end, the width of the spray pattern applied to the end coated surface is reduced and the amount of paint applied to the coated surface is small. Moreover, since the target direction of the paint spray port of the spray gun at the end is tilted from the end of the object to be coated toward the center, coating is performed from the end of the object to the center. The coating amount distribution of the coating pattern applied to the painted surface of the portion is large on the end side of the object to be coated and small on the center side. Therefore, it is possible to form a uniform coated surface up to the end of the coated surface and to extremely reduce the scattering of the coating material.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an explanatory view of an embodiment of the spray coating method of the present invention, FIG. 2 is an explanatory view showing a movement path of a spray gun of the embodiment of FIG. 1, FIG. 3 is an enlarged view of a main part of FIG. 1, and FIG. It is a perspective view of the conventional spray coating equipment which shows an example of the spray coating equipment used for the spray coating method of the present invention.
In the figure, 1 is a spray gun, 3 is an object to be coated, 5 is a paint spray port, 31 is the end of the object to be coated, 32 is a part other than the end, 41 is the painted surface of the end 31, and 42 is the end. It is the coated surface of the portion 32 other than. The spray gun 1 is a robot 2
Of the spray gun 1 is driven by a signal from a control unit (not shown), and the vertical distance between the paint spray port 5 and the coating surface 4 of the object 3 to be coated, the target direction of the paint spray port 5 and The moving speed is controlled and adjusted to a predetermined value.

L ₁ is the distance between the paint spray port 5 and the coating surface 41 of the end 31 of the object 3 to be coated. This distance L ₁ is
The distance is determined to be shorter than the distance L ₂ between the portion 32 other than the end portion and the painted surface 42 and is input to the control unit. In this embodiment, L ₁ = 400 mm and L ₂ = 600 mm.

A ₁ is the aiming direction of the paint spray port of the spray gun 1 when the end 31 of the object 3 is painted. The aiming direction A ₁ is an angle in the width direction with respect to the direction perpendicular to the coating surface, which is inclined from the end 31 of the object 3 to be coated toward the center. This A ₁ is input to the control unit. In this embodiment, A ₁ = 20 °.

The moving speed of the spray gun at the end 31 of the object 3 to be coated is inputted to the controller as a speed higher than the moving speed of the portion 32 other than the end on the coating surface 42.
In this embodiment, the moving speed of the end portion 31 is 1.2 times the moving speed of the painted surface 42 other than the end portion.

The vertical distance L ₁ of the paint spray port 5 is changed from the vertical distance L ₂ to the vertical distance L ₂ , that is, the feed distance P _{1 in} the width direction (parallel to the pitch of the path) at the time of changing from the high moving speed to the normal moving speed, and the end portion. The pitch of the path of the paint spray port 5 in the portion 32 other than the above is P _2, and the feed pitch P ₂ is the portion 3 other than the end portion.
The width of the second coating pattern 11 is set to about 1/2, and the feed distance P ₁ is input to the control unit as about P ₂ /(1.1 to 1.4). In this embodiment, L ₁ = 400 mm, L ₂
= 600 mm, A ₁ = 20 °, and the moving speed of the end 31 is 1.2 times the moving speed of the coating surface 32 other than the end, P ₁ = 100 mm, P ₂ = 125 mm Is input to the control unit in the same manner as. 10 is the end 31
L ₁ on the coating surface 41 of the coating pattern of 1 stroke in the aiming direction A ₁ , 11 is a portion 3 other than the end portion 31
This is a one-stroke application pattern at a distance L ₂ on the second coated surface 42.

Next, the spray coating method of this embodiment will be described. First, the paint spray port 5 of the spray gun 1
Is located at a distance L ₁ from the coated surface 41 of the end portion 31,
The aim direction of the paint spray outlet 5 as A ₁ (the position of A), an end portion 31 of the coated object 3, the spray gun 1 in the X direction in FIG. 2, a faster rate than the moving speed when the distance L ₂ ( In this embodiment, the coating is performed while moving at a speed of 1.2 times.
The amount of paint sprayed from the spray gun 1 is the same as that at the distance L ₂ . At this time, the coating pattern 10 is formed on the coated surface 41.

Then, the aiming direction of the paint spray port 5 is returned to the direction perpendicular to the coating surface 41, the paint spray port 5 is moved in the width direction by a distance P ₁ , and the coating surface 41 and the paint spray port 5 are Back to the distance L ₂ (position B), and the end 31
The coating surface 41 is repeatedly coated while moving the spray gun 1 in the X direction of FIG. 2 at a speed (1 / 1.2) slower than the moving speed of the spray gun 1 at the distance L ₁ . The amount of paint sprayed from the spray gun 1 is the same as the amount sprayed at the distance L ₁ .

Next, while keeping the distance L ₂ between the paint spray port 5 and the coating surface 41 and the aiming direction of the paint spray port 5 vertical to the coating surface 4, the paint is sprayed in the width direction by a distance of P _2. The spray port 5 is moved (position C), and the part 32 other than the end portion of the coating object 3 is coated while moving the spray gun 1 in the X direction of FIG. 2 at the same spray amount and at the same moving speed. To do.

In the same manner as described below, as indicated by the arrow in the figure,
The coating material spray port 5 is moved in the order of D, E, and F, and a portion 32 other than the end portion of the coating object 3 is formed in a constant spray pattern.
Overcoat. When approaching the other end 31, the paint spray port 5 is moved in the width direction by a distance of P ₁ , and the distance between the paint spray port 5 and the coating surface 41 is L.
₁ , the target direction of the paint spray port 5 is A ₁ (position G), and the end 31 is moved in the X direction of FIG. 2 in the same manner as the above-mentioned end coating method. While painting, the painting is completed.

Next, the coating condition at the end portion of the object to be coated by the method of the present invention will be described in more detail with reference to FIG. 3 which is an enlarged explanatory view of the main part of FIG. 8 and 10 are spray patterns and application patterns when the distance is L ₁ and the aiming direction A ₁ , respectively, and 9 and 11 are spray patterns when the distance is L ₂ and the aiming direction is vertical to the painting surface 41. And the application pattern. When the end portion 31 is coated by the conventional method, the spray pattern 9 shown by the alternate long and short dash line in FIG. 3 has a distance L ₂ and an aiming direction perpendicular to the coating surface 41, and moves in the width direction by a distance P _2. Fig. 7 shows a spray pattern in the case of being made to.

[0017] than when placing the spray gun 1 to the distance L _2, when people when placed at a distance of L ₁ is the width of the spray pattern is narrower, to the application of the end 31 as in the conventional method, It is possible to prevent the paint that largely protrudes from the end portion 31 from scattering.

Further, by setting the aimed direction angle A _1, the coating weight distribution of the coating pattern 10 is often the end side of the coated object 3, since becomes less opposite, the distance L ₂ from the position of B In the coating pattern 11 coated with, the coating amount distribution gradually decreases toward the end, but this can be compensated for. With these, it is possible to form a uniform and good coating surface up to the end of the coating surface 41, and it is possible to extremely reduce the scattering of the coating material.

[0019]

According to the present invention, in a spray coating method in which a spray gun is run on the coating surface of an object to be coated and the coating is sprayed from the coating spray port to coat the entire surface, The distance between the coating surface and the paint spray port at the end is changed between the end and the other end to shorten the distance at the end, and the moving speed at the end is the moving speed other than the end. Even faster, and by coating the target direction of the paint spray port of the spray gun from the end to the center of the object to be painted, multiple coatings are applied at the end, so even the end of the coating part In addition to forming a uniform coating surface, it is possible to extremely reduce the scattering of the coating material and improve the coating efficiency.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of a spray coating method of the present invention.

FIG. 2 is an explanatory view showing a moving path of the spray gun of FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a perspective view of a spray coating device used in a spray coating method.

FIG. 5 is an explanatory view showing a conventional spray coating method.

FIG. 6 is an explanatory view showing a conventional spray coating method.

[Explanation of symbols]

1: Spray gun 2: Robot 3: Painting object 4, 41, 42: Painting surface 5: Paint spraying port 6, 10, 11: Application pattern 31: End part 32: Parts other than the end part L, L ₁ , L ₂ : Distance between paint surface and paint spray port P, P ₁ , P ₂ : Spray gun feed pitch A ₁ : Target direction of paint spray port

Claims (1)

[Claims] 1. A spray coating method in which a spray gun is run on a coated surface of an object to be coated, and a coating material is sprayed from a coating material spray port to coat the entire surface. The distance to the paint spray port is changed between the end portion and the portion other than the end portion, and the distance at the end portion is shortened, and the moving speed at the end portion is made faster than the moving speed other than the end portion. A spray coating method characterized in that the target direction of the paint spray port of the spray gun is from the edge of the object to be coated toward the center so that the edges are overcoated.