JP6379066B2 - How to paint a bumper - Google Patents

Description

  The present invention relates to a method of painting a bumper that is a component part of a vehicle such as an automobile.

  A bumper for a vehicle is usually painted using a painting robot as described in Patent Document 1, for example. On the other hand, as shown in FIG. 2A, in the bumper B, a pair of side surface plate portions 2 (2a, 2b) extending rearward are curved at both ends of the front plate portion 1 extending relatively long in the lateral width direction. It has the form connected to the shape or the bent shape. For this reason, conventionally, when the bumper B is painted, it is painted along the locus indicated by the arrow line Da in FIG. 2A, and the direction of the path is the longitudinal direction of the bumper B. According to such means, since the moving stroke of the coating gun 4 in one pass can be made longer and the number of times of folding can be reduced, work efficiency is good.

  However, the conventional means has the following problems.

First, the coating order of each part of the bumper B is, for example, in the order of the right side plate 2a, the front plate 1 and the left side plate 2b in the forward process pass, and in the subsequent return process pass, The left side plate portion 2b, the front plate portion 1, and the right side plate portion 2a are arranged in this order. Therefore, the time difference between the forward process pass and the return process pass is large, and a relatively large time difference occurs between the coating times of the side plate portions 2a and 2b. Since such a time difference causes a difference in how the coating film is dried, there is a possibility that a difference occurs in the coloring of the coating of the pair of side face plates 2a and 2b. Since the side plate portions 2a and 2b of the bumper B are generally provided so as to be connected to the fender panel, any one of the side plate portions 2a and 2b of the bumper B is different from the planned color development. When a colored coating state is reached, the color difference from the fender panel becomes conspicuous.
Second, in order to improve the quality of painting, it is necessary to always control the painting gun 4 in a posture perpendicular to the portion to be painted. On the other hand, conventionally, as shown in FIG. 2B, the outer surface of the boundary region 3 between the side plate portion 2 and the front plate portion 1 is a curved surface 30, and straddles the ridge line of the curved surface 30. Thus, the painting gun 4 is moved. Therefore, the control for setting the coating gun 4 to the vertical posture with respect to the curved surface 30 is not only complicated, but the posture control is likely to be shifted. If such deviation occurs, coating unevenness occurs and the quality of the coating deteriorates. If the performance of the painting robot is improved in order to solve this problem, the equipment cost becomes expensive.

  For the bumper B coating, instead of the general metallic coating in which three layers of primer layer, base layer, and clear layer are laminated, for example, a chromatic pearl color high-design coating with a two-layer base layer structure You may want to apply. However, such high-design coating is considerably more conspicuous in the difference in coating coloration and coating unevenness than the above-described general metallic coating, and the above-described problems become more remarkable.

JP 2003-299995 A

The present invention has been conceived under the circumstances as described above, and a difference in coloring occurs between the pair of side plate portions of the bumper, or the curved surface of the boundary region between the side plate portion and the front plate portion. An object of the present invention is to provide a bumper coating method capable of appropriately eliminating problems such as coating unevenness at low cost.

  In order to solve the above problems, the present invention takes the following technical means.

  The bumper coating method provided by the present invention includes a front plate portion and a pair of side plate portions connected to both longitudinal ends thereof, and an outer surface of a boundary region between the pair of side plate portions and the front plate portion. A bumper is applied by spraying a paint from a painting gun of a painting robot onto a bumper having a curved surface, and the painting order of the bumper is the same as the painting of both the pair of side plate portions. The coating of the front plate portion is performed in the order of coating, and the pair of side plate portions and the curved surface are coated in the same direction as the direction in which the ridge line of the curved surface extends, The painting of the front plate part is characterized in that the direction of the pass is performed in substantially the same direction as the longitudinal direction of the front plate part.

According to such a configuration, the following effects can be obtained.
First, since it is possible to prevent a large time difference from occurring in the respective coating times of the pair of side plate portions of the bumper, it is possible to dry the respective coating films on the pair of side plate portions, and various other types. It is possible to prevent a large difference in the coating conditions. As a result, the difference in the coloring of the coating applied to each of the pair of side surface plate portions can be suppressed, and the design properties can be improved. This is also preferable in finishing both the pair of side plate portions so that the color difference from the fender panel is not noticeable. In addition, since the pair of side plate portions is coated prior to the front plate portion, it is expected that the paint will have sufficient time for the paint to fully fit on the pair of side plate portions and that the quality of the coating on the side plate portions will be improved. it can.
Secondly, when painting the curved surface of the boundary region between the side plate portion and the front plate portion, there is no need to move the coating gun so as to cross the ridge line of the curved surface, and the painting gun is applied to the portion to be painted. On the other hand, it is easy to control to maintain a vertical posture. Therefore, it is not necessary to use a highly accurate and expensive painting robot, and the equipment cost can be reduced. In addition, it is possible to suppress the occurrence of coating unevenness due to a posture control error of the coating gun and improve the quality of the coating.
Thirdly, since the direction of the path is the same as the painting of the side plate portion and the painting of the curved surface, it is possible to eliminate the occurrence of coating unevenness between them.
Fourth, the front plate portion has a larger area than the side plate portion, but the coating of the front plate portion is the same as the longitudinal direction of the front plate portion, so that the entire bumper is coated. This is effective in shortening the required time. The painting of the front plate part is different in the direction of the path from the painting of other areas, but unlike the side plate part, there is less possibility of comparing colors with other panel materials such as fender panels, etc. The difference in path direction is not a significant issue.
Fifth, in the present invention, as described above, since it is possible to suppress the difference in the coloring of the coating and the coating unevenness, for example, it is suitable for high-design coating of chromatic pearl color.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is explanatory drawing which shows an example of the coating method of the bumper which concerns on this invention, (a) is a perspective view, (b) is a left view, (c) is a front view, (d) is a right side FIG. An example of a prior art is shown, (a) is a perspective view, (b) is a sectional view.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
In FIG. 1, for the sake of easy understanding, the same elements as those in the prior art shown in FIG.
The same reference numerals as those in FIG.

In FIG. 1, a bumper B to be painted is the same as that shown in FIG. 2, and a pair of side plate portions 2 (2 a, 2 a, 2) extending rearward at both ends of the front plate portion 1 extending in the lateral width direction. 2b) is a form connected in a curved or bent shape. The outer surface of the boundary region 3 between each side plate portion 2 and the front plate portion 1 is a curved surface 30.
In an actual painting operation, the bumper B is not necessarily painted in the posture shown in FIG. The bumper B is generally supported by an appropriate jig (not shown), and the paint is applied in a state where, for example, the outer surface of the front plate portion 1 is set to an upward orientation or an obliquely upward orientation. Applied. The type of painting is spray painting using a painting gun 4 of a painting robot.

In order to paint the bumper B, first, a pair of side plate portions 2 is painted prior to painting the front plate portion 1.
More specifically, for example, the outer surface of one side plate portion 2a is first painted. At that time, the curved surface 30 of the boundary region 3 (3a) between the side plate portion 2a and the front plate portion 1 is also painted. The painting in this case is performed along a locus as indicated by an arrow line D1. In this coating, the direction of the path is set to be substantially the same as the direction in which the ridge line of the curved surface 30 extends (corresponding to the short direction of the bumper B, which is the vertical direction in FIG. 1). Next, the outer surface of the other side plate 2b and the curved surface 30 of the boundary region 3 (3b) between the side plate 2b and the front plate 1 are painted. The painting in this case is performed with a locus as indicated by the arrow line D2, but the painting method (pass direction) is the same as the painting of the curved surface 30 of the side plate portion 2a and the boundary region 3a.

  In this way, if the pair of side surface plate portions 2 (2a, 2b) are continuously coated, a large time difference will not occur in the coating time of these portions, so that each of the side surface plate portions 2a, 2b It is possible to prevent a difference in coloring of the coating film by preventing a significant difference in the way of drying the coating film and other various coating conditions. The side plate 2 is attached to the vehicle so as to be connected to the fender panel of the vehicle. However, according to the present embodiment, the color difference from the fender panel is hardly noticeable in any of the pair of side plates 2a and 2b. It is possible to finish.

  Also, if the coating trajectory of the arrow lines D1 and D2 described above is used, unlike the case where the coating gun 4 moves while straddling the ridge line of the curved surface 30, the coating gun 4 is applied to the portion to be coated. Control to maintain a vertical posture is facilitated. In addition, it is possible to suppress the occurrence of coating unevenness due to a posture control error of the coating gun 4 and improve the quality of the coating. The painting of each side plate portion 2 and the painting of the curved surface 30 in the boundary region 3 have the same direction of the path, so it is possible to suitably eliminate the occurrence of coating unevenness between them. is there. For this reason, the coating method according to the present embodiment is optimal for, for example, the above-described chromatic pearl high-design coating.

  After finishing the painting of the pair of side surface plate portions 2, the front plate portion 1 is painted. In this case, the painting is performed along a locus indicated by an arrow line D3. In this coating, the direction of the pass is the longitudinal direction of the front plate portion 1. In this way, since the length of one pass can be increased, it is preferable for efficiently coating the front plate portion 1 having a large area and shortening the time required for coating the entire outer surface of the bumper B. It will be a thing. Although the coating of the front plate portion 1 differs from the coating of the side plate portion 2 and the curved surface portion 30 in the direction of the path, as described above, this itself does not cause a problem.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each work process of the bumper coating method according to the present invention can be changed within the intended scope of the present invention.

When two painting guns are used, it is possible to paint a pair of side plate portions simultaneously. As the coating gun, a general spray gun, a bell type spray coating apparatus, or the like can be used, but its specific structure and type are not limited.

B Bumper 1 Front plate part 2 Side plate part 3 Boundary area 30 Curved surface 4 Paint gun

Claims (1)

A painting robot is provided on a bumper having a front plate portion and a pair of side plate portions connected to both ends in the longitudinal direction, and an outer surface of a boundary region between the pair of side plate portions and the front plate portion being a curved surface. This is a bumper painting method by spraying paint from a painting gun
The order of painting on the bumper is the order of painting on the front plate after finishing painting both of the pair of side plate portions,
The coating of the pair of side surface plate portions and the curved surface is performed by setting the direction of the path as substantially the same direction as the direction in which the ridge line of the curved surface extends,
The bumper coating method is characterized in that the coating of the front plate portion is performed with the direction of the pass being substantially the same as the longitudinal direction of the front plate portion.

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