JPS60110366A - Automatic coating method and apparatus thereof - Google Patents

Abstract

PURPOSE:To secure a good paint penetrating property to a region having a narrow complicated shape, by controlling the flow amount of air corresponding to the dimension and shape of a coating region and performing automatic coating while changing a circular coating pattern. CONSTITUTION:The air spray coating gun 2 attached to the arm part 1 of a coating robot is moved along the peripheral part of the door of a car to continuously perform automatic coating. The flow amount of air flowing through a pattern regulating air passage 7 is properly controlled corresponding to the dimension and shape of the coating region of a body 4 through a flow amount control valve 8. By this method, automatic coating can be performed while the size of the circular coating pattern of the coating gun 2 is appropriately changed corresponding to the dimension and shape of a curner part 4a or a channel part along with the operation of the coating robot. Therefore, coating can be applied well in the same gun position without altering the angle of the gun 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic painting method and apparatus for automatically painting an object to be painted, such as an automobile body having a complicated surface shape, using a painting robot. It is something.

(Prior art) Conventionally, in automatic painting equipment equipped with a painting robot,
To make it easier to adjust pattern shape and film thickness distribution when performing automatic painting.

An air atomization (electrostatic) paint gun in the form of a fan pattern is used. Since this coating method has directionality in the pattern shape, it is recommended to apply robot coating to areas where the coating surface changes direction by 90 degrees.

Each time, the gun angle of the air atomization (electrostatic) painting gun relative to the coating surface must be changed by 90 degrees.
During switching, paint defects and damage due to twisting of painting hoses and cables are likely to occur.

Therefore, recently, as a countermeasure to this problem, a circular pattern with no directionality has been applied to the pattern shape. Rotary atomization coating using a so-called microbell has been published. But according to this method of painting.

Because the paint gun size is large and the pattern shape is formed mainly by centrifugal force and electrostatic force, 1) The coating area is narrow and has a complex shape, such as the area around the door of an automobile body or a part of the door inner. When painting, the N-1 turn size may be too large for the application area, or the arm of the painting gun or painting robot may interfere with the area around the door, or even the channel of the car body. There is a problem in that it has a negative effect on the ability of paint to crowd into the area.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to:

Automatic painting of coating areas with narrow coating areas and complex shapes can result in poor coating and damage to hoses and cables.It is important to keep the pattern size optimal depending on the coating area and to avoid interference with the object to be coated. This makes it possible to avoid this and ensure good paint crowding properties. An object of the present invention is to provide an automatic painting method and device.

(Structure of the invention) In other words, the present invention achieves this objective! Ma.

The present invention is characterized in that automatic painting is performed while changing a non-directional circular painting pattern in accordance with the size and shape of the coating area of the object to be coated. 1. An automatic painting device for directly carrying out the method of the present invention is provided with a pattern A conditioning air passage for changing the painting pattern on the outer periphery of the head of the air atomizing painting gun attached to the painting robot, The amount of air flowing through this air passage is controlled according to the size and shape (planar shape and three-dimensional shape) of the application area via a flow rate control means connected to the air passage. It is.

In this way, if you paint while changing the coating pattern depending on the size and shape of the area to be coated.

Even if the coating area is narrow and has a complex shape.

Since automatic painting can be performed using a small painting pattern, it is possible to paint well without changing the gun angle, and for channel-shaped application areas, it is possible to paint well without leaving any unpainted areas. Paint can be applied while ensuring paint crowding.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. As shown in Fig. 1, an air atomization painting gun 2 is fixedly attached to the tip of an arm part 1 of a painting robot. . As shown in FIG. 2, the atomizing head 3 of the air atomizing paint gun 2 has a circular pattern of paint passages 5 through which paint is ejected toward an automobile body 4, which is an object to be painted, and a paint passage 5. an annular atomizing air passage 6 disposed between the inside and outside of the atomizing air passage 6; and a pattern adjusting air passage 7 directed inward to change the coating pattern on the outside of the atomizing air passage 6. is provided.

The air flowing through the pattern adjustment air passage 7 is as follows.

Through a flow control valve (flow control means) 8 connected to the air passage 7, the size and shape (planar The flow rate can be controlled optimally according to the shape of the three-dimensional curved surface. Here, through a control unit (not shown) that inputs operation signals of the painting robot, the teaching operation of the movement trajectory of the painting robot is simultaneously performed, and the flow rate control valve 8 is controlled in accordance with the movement of the painting robot.
Valve control has been performed in advance.

When using this automatic painting device to paint the area around the door of tenon-4, for example, move the air atomizing paint gun 2 attached to the arm 1 of the painting robot around the door in the direction of the arrow in Figure 1. Continuously perform automatic painting while moving. During this coating, the amount of air flowing through the pattern adjustment air passage 7 is appropriately controlled according to the size and shape of the application area of the body 4.

The size of the circular painting pattern of air atomization painting gun 2 is as follows:
Automatic painting is performed while changing appropriately with the operation of the painting robot according to the dimensions and shapes of the corner portion 4a, channel portion 4b, etc. of the body 4.

Therefore, the course portion 4a where the coating surface changes direction by 90 degrees
Even when painting objects, it is possible to perform the painting with the same gun position each time without changing the gun angle of the air atomization painting gun 2, and the wrist at the tip of the arm 1 of the painting robot Twisting motion is also not necessary.

Also, when painting the channel portion 4b7j of the Pode 4, the pattern size changes depending on the uneven surface of the channel portion 4b, so as shown in FIG. This allows for a more complete coat without leaving any unpainted areas. Furthermore, since circular pattern painting is performed using an air atomization method, unlike single-turn electrostatic tin coating, there is no risk of poor coating in concave areas due to the Faraday effect, and a uniform coating thickness can be achieved. In Fig. 3, the symbol P indicates the coating film attached to the surface of the POD 4.In addition, in the embodiment, even if the air-type coating gun 2 is provided with an electrostatic coating function, the same effect as in the above embodiment can be obtained. can get.

(Effects of the Invention) As described above, according to the present invention, which performs painting while changing the circular painting pattern depending on the size and shape of the application area, the gun angle can be changed even when the direction of the application surface changes by 90 degrees. This eliminates painting defects and twisting of hoses and cables, eliminates the need for twisting movements of the painting robot's wrists, and simplifies the teaching work. The pattern size can be adjusted appropriately to the application area of the shape, interference between the object to be coated and the painting gun can be avoided, and the tendency of paint to crowd into the channel part of the object to be coated is significantly reduced compared to conventional methods. improves.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts showing an embodiment of the present invention. FIG. 2 is a cross-sectional view of the air atomization painting gun shown in FIG. 1, with the top not shown. FIG. 3 is a sectional view taken along line I--I in FIG. 1. 1--Arm portion of painting robot, 2--Air atomizing painting gun, 3--Atomizing head, 4--Pod (object to be coated). 4a...corner part, 4b...channel part, 7...
・Air passage for pattern adjustment, 8...Flow rate control valve (1 idiot)

Claims (2)

[Claims] (1) An automatic painting method characterized by performing automatic painting while changing a circular painting pattern according to the size and shape of the application area of the object to be painted. (2) An air passage for pattern adjustment is provided on the outer periphery of the H head of the air atomizing paint gun attached to the tip of the arm of the painting robot to change the circular painting pattern.
An automatic coating apparatus characterized in that a flow rate control means is connected to the air passageway for controlling the amount of air flowing through the air passageway according to the size and shape of the coating area of the object to be coated.