JP3451790B2 - Automobile painting method and painting trolley - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a painting method and a painting cart used in a painting process for manufacturing automobiles, particularly in an automatic painting process.

[0002]

2. Description of the Related Art In recent years, an increasing number of automobiles have a synthetic resin bumper coated with the same color as the body. In the manufacturing process of such an automobile, the body is electrostatically coated while the bumper is coated in another coating process, and then the bumper is attached to the body.
There was a problem in that there was a difference in the shades between the two because they had been subjected to separate coating processes.

Therefore, the bumper made of synthetic resin is subjected to a conductive treatment as a pretreatment for electrostatic coating, and then the body and the bumper are sent to the same coating step,
Both sides were painted in the same shade. Such a technique is disclosed in, for example, Japanese Patent Laid-Open No. 3-4970.

Further, as a means for sending the body and the bumper to the same painting process, a jig for supporting the bumper in the vicinity of the body supported on the base is provided, and the jig is used for raising and lowering the bumper. There is a trolley for painting which is provided with a means and a rotating means for rotating the bumper back and forth. Such a coating trolley is disclosed in, for example, Japanese Utility Model Laid-Open No. 3-54762.

[0005]

However, in painting an automobile using the conventional painting cart as described above, it is possible to change the height and direction of the bumper according to, for example, the movable range of the painting gun. Although it is possible, the structure is complicated by the elevating means and the rotating means, and the paint is apt to adhere to these means to cause malfunction, and further,
There is a problem that the work is complicated when the paint adhering to each means is periodically removed, and it has been a problem to solve such a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above-mentioned conventional problems, and is particularly suitable for the step of automatic painting in the painting of automobile bodies and bumpers, and uses a simple jig. It is an object of the present invention to provide a method for painting an automobile capable of performing excellent painting, and also to provide a painting cart having a simple structure and easy maintenance.

[0007]

According to a first aspect of the present invention, there is provided a method for coating an automobile, wherein a body of an automobile and a bumper assembled to the body are automatically coated in the same process before and after the front and rear of the body. With the bumpers arranged, each bumper is fixedly supported upward in an inclined state at an angle of 40 to 60 degrees, the body and each bumper are moved in the traveling direction of the body, and the painting guns facing the upper side and the lateral side of the body. After the coating is performed by the above method, the body and each bumper are sent to the baking process in the state of being fixedly supported as they are, and the above configuration is a means for solving the problem.

A vehicle for painting a vehicle according to the present invention is, as a third aspect, a vehicle for painting which is used when automatic painting is performed by a coating gun facing the upper side and the lateral side of the vehicle body. A body jig that supports the
The bumper jigs for supporting the front and rear bumpers in front of and behind the body supported by the body jig are provided, and each bumper jig has a plurality of supporting portions that obliquely protrude from the carriage main body and each supporting portion. A rod having a lower end removably fitted therein, and a bumper receiver having an outer shape corresponding to the inner shape of the bumper and provided with a connecting portion to which the upper end of each rod is removably fitted, Bumper up 40-60
The body and the bumper are fixedly supported in a tilted state at an angle of degrees, and the body and the bumper are moved in the traveling direction of the body. In this structure, the bumper is made of synthetic resin, more specifically, polypropylene or the like.

Here, in the above-mentioned automobile painting method and painting cart, the angle range for supporting the bumper is set to 40 to 60 degrees because the bumper is horizontal (0 degree) as shown in FIG. If it is supported on, both sides of the bumper will easily hang down during the baking process after painting,
On the other hand, if the support angle is set to 40 degrees or more, the allowable deformation amount (1 mm) will be within, and if the bumper is supported vertically (90 degrees), the front surface Sf of the bumper shown in FIG. Is sufficiently coated, but the film thickness of the paint on the upper surface Su of the bumper becomes insufficient. For this, if the support angle is 60 degrees or less, the front surface Sf of the bumper is
This is because not only an acceptable film thickness (15 μm) is obtained on both the upper surface Su and the upper surface Su but also there is no difference in the film thickness from the front surface Sf to the upper surface Su, so that it is more desirable. As described above, the support angle of the bumper is in the range of 45 to 55 degrees.

In the automatic coating process, the bumper supported as described above is mainly coated by a coating gun facing the upper side and the lateral side of the bumper. This allows the bumper to have an acceptable paint film thickness on the upper surface Su, the front surface Sf, and the side surfaces. The lower surface of the bumper is naturally painted, but it is not covered here because it is not noticeable in appearance when mounted on a vehicle.

[0011]

[0012]

In the automobile coating method according to the first aspect of the present invention, since the front and rear bumpers are fixedly supported on the front and rear of the body, a jig for supporting each bumper may be a simple one. By painting with a painting gun facing the upper side of the body, good painting is made on the front and upper surfaces of the bumper, and after painting, the body and bumper are sent to the baking process with the fixed support state as it is,
The amount of deformation of the bumper in the baking process is also extremely small. Further, by setting the support angle of the bumper within the range of 45 to 55 degrees as described in claim 2, the degree of change of the paint film thickness is further reduced, and the deformation amount of the bumper during baking is smaller. Become.

According to a third aspect of the present invention, the bumper jig is composed of a supporting portion, a rod, and a bumper receiver, and the bumper jig is arranged in front of and behind the body jig. Since the front and rear bumpers are fixedly supported in an inclined state within a range of 60 degrees, the structure of the bumper jig is simple, and the front of the bumper can be painted by using a painting gun facing the upper side of the body. Also, good coating is performed on the upper surface, and the amount of deformation of the bumper in the baking process after coating is extremely small. Further, since the support portion, the rod, and the bumper receiver that constitute the bumper jig can be attached to and detached from each other, the structure is simple, and the assembly and disassembly are extremely easy, and maintenance can be easily handled. Become. Further, the support angle of the bumper is set to 4 as described in claim 4.
By setting it in the range of 5 to 55 degrees, the degree of change in the coating film thickness is further reduced, and the deformation amount of the bumper during baking is further reduced.

[0014]

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a method for painting an automobile and a dolly for painting according to the present invention will be described below with reference to the drawings.

The coating carriage 1 shown in FIG. 1 is provided with a body jig 4 for supporting a body B of an automobile on the upper surface of a base 3 movable by a plurality of traveling wheels 2, and front and rear bumpers are provided in front of and behind the jig 4. Fb and rear bumper Rb 4
The bumper jigs 5 and 5 are fixedly supported in an inclined state at an arbitrary angle θ in the range of 0 to 60 degrees. In addition,
As is clear from FIG. 1, the painting cart 1 moves the body B in the traveling direction (rightward in FIG. 1).

As shown in FIG. 3 showing the front jig, the bumper jig 5 includes two cylindrical support portions 6 and 6 that project obliquely forward from the carriage main body (base 3), and each support. The rods 7, 7 whose lower end portions are detachably fitted to the portion 6, and the connecting portions 8 which have an outer shape corresponding to the inner shape of the front bumper Fb and whose upper end portions are detachably fitted. It is composed of a bumper receiver 9 provided with 8.

The support portions 6 are 40 to 6 with respect to the base 3.
It is inclined at an arbitrary angle θ in the range of 0 degree, more preferably in the range of 45 to 55 degrees. Each rod 7 is made of, for example, iron, and a large diameter portion 7a for keeping the amount of insertion into the support portion 6 is provided in the middle portion thereof. The bumper receiver 9 is made of, for example, fiber reinforced plastic, and has a structure in which the iron rod 10 is installed between the side wall portions 9a and 9a, and two connecting portions 8 and 8 are provided in the iron rod 10.
The front bumper Fb can be reliably supported simply by mounting the front bumper Fb.

The painting cart 1 is operated in the painting process shown in FIG. A body is placed in advance on the trolley for painting 1, and undercoating and intermediate coating (B1) are performed on the body in this state. On the other hand, the front and rear bumpers are subjected to water-based cleaning (B2). After completion of each step, a bumper is set on the painting cart 1 (B3), and in this state, primer coating (B4) as a conductive treatment is applied to the bumper, and then overcoating (B5) on the body and bumper. Will be done. After this overcoating, the body and bumper are baked (B6) at, for example, about 140 ° C. for 20 minutes, and then sent to assembly (B7). Therefore, the body is fitted with a painted and baked bumper at the same time.

In the top coating in the above process, automatic coating is performed using the coating guns facing the upper side and the side of the carriage. At this time, in the coating method and the coating carriage 1, since the bumpers Fb and Rb are fixedly supported in an inclined state at an arbitrary angle θ in the range of 40 to 60 degrees, the coating gun facing the upper side in particular is horizontal. By simply moving in the direction, the allowable paint film thickness (15 μm or more) shown in FIG. 5 can be obtained on the front surface Sf and the upper surface Su of the bumper shown in FIG.

Further, in the baking process after coating, if the bumper Fb is kept horizontal as shown in FIG. 2, for example, the bumper Fb is deformed so that both sides thereof hang down (symbol A).
To indicate). On the other hand, in the coating method and the coating carriage 1, since the bumpers Fb and Rb are fixedly supported in an inclined state at an arbitrary angle θ within the range of 40 to 60 degrees, the deformation thereof as shown in FIG. Is the allowable deformation (1m
It is extremely small within m).

Further, since the coating carriage 1 used in the coating method supports the bumpers Fb and Rb in a fixed state, the structure thereof becomes extremely simple. More specifically, the supporting portion 6, Since the bumper jig 5 is configured by the rod 7 and the bumper receiver 9 and the upper and lower ends of the rod 7 are simply inserted into the connecting portion 8 and the supporting portion 6 of the bumper receiver 9, assembly and disassembly are extremely simple. It is extremely easy to remove the paint adhering to the bumper jig 5. Moreover, in the above-mentioned embodiment, since the main part of the bumper receiver 9 that constitutes the bumper jig 5 is made of fiber reinforced plastic, there is no fear of being deformed by the heat during baking, and it is light in weight, so it is easier to handle. It's easier.

[0023]

As described above, according to the coating method for automobiles according to the first aspect of the present invention, the bumper-dedicated painting process is eliminated, and the energy and equipment cost for the painting and painting process are saved accordingly. In addition, it is possible to prevent the difference in color between the body and the bumper, and it is possible to simplify the jig for supporting the bumper, and the relatively simple operation of the painting gun in automatic painting. By doing so, it is possible to perform a good coating to obtain a sufficient paint film thickness on the important parts of the bumper appearance.Furthermore, by sending the body and bumper as they are to the baking process, the bumper deformation in this baking process can be prevented. It can be as small as is acceptable.

Further, according to the automobile coating method of the second aspect of the present invention, the degree of change in the coating film thickness is further reduced by setting the support angle of the bumper within the range of 45 to 55 degrees. In addition, the amount of deformation of the bumper during baking after coating can be further reduced.

According to the trolley for painting an automobile according to claim 3 of the present invention, the painting process dedicated to the bumper is abolished, the energy and equipment cost are saved in the painting and painting process accompanying this, and the hue of the body and the bumper is reduced. In addition to being able to prevent differences, the structure of the trolley can be greatly simplified, which makes maintenance extremely easy, and the relatively simple coating gun, especially in automatic painting. With just the operation, a sufficient paint film thickness can be obtained on the important parts of the bumper's appearance, and good-looking painting can be performed.Furthermore, the body and bumper can be sent directly to the baking process. Therefore, the deformation of the bumper in this baking process can be made extremely small within the allowable range. Further, since the bumper jig is composed of the support portion, the rod and the bumper receiver, the structure of the bumper jig can be further simplified, and the assembly and disassembly of the bumper jig are extremely easy. Therefore, maintenance such as work for removing the adhered paint can be easily performed.

Further, according to the vehicle for painting a vehicle of claim 4 of the present invention, the support angle of the bumper is 45 to 55.
By setting the range of the degree, it is possible to further reduce the degree of change in the coating film thickness, and it is possible to further reduce the deformation amount of the bumper during baking after coating.

[0027]

[Brief description of drawings]

FIG. 1 is a side view illustrating an embodiment of a painting carriage applied to a painting method according to the present invention.

FIG. 2 is a perspective view illustrating deformation of a bumper during baking.

FIG. 3 is a perspective exploded view illustrating a front bumper jig.

FIG. 4 is a block diagram illustrating a painting process of an automobile.

FIG. 5 is a graph showing changes in the amount of deformation of the bumper and the film thickness of the paint with respect to the support angle of the bumper.

[Explanation of symbols]

B body Fb front bumper Rb rear bumper 1 Painting cart 4 Body jig 5 Bumper jig 6 Support 7 rod 8 connection 9 bumper receiver

Claims (4)

(57) [Claims] 1. When automatically coating a car body and a bumper assembled to this body in the same process, front and rear bumpers are arranged in front of and behind the body, and each bumper is inclined upward at an angle of 40 to 60 degrees. Fixed and supported in the state, move the body and each bumper in the running direction of the body, and after painting with the painting gun facing the upper side and the side of the body, bake the body and each bumper in the fixed support state as it is A method for painting an automobile, which is characterized in that it is sent to a process. 2. The method of coating an automobile according to claim 1, wherein the support angle of the bumper is in the range of 45 to 55 degrees. 3. A painting trolley used when automatic painting is performed by a painting gun facing the upper side and the lateral side of a body of an automobile, the jig for a body supporting the body, and the jig for the body supported by the jig for the body. A bumper jig that supports the front and rear bumpers respectively is provided at the front and rear of the body, and each bumper jig has a plurality of support parts that project diagonally from the trolley body, and the lower end part is removable from each support part. The rod is fitted with a bumper receiver having an outer shape corresponding to the inner shape of the bumper and provided with a connecting portion to which the upper end portion of each rod is detachably fitted. A dolly for painting an automobile, which is fixedly supported in an inclined state at an angle of degrees and moves a body and a bumper in a traveling direction of the body. 4. A trolley for painting an automobile according to claim 3, wherein the support angle of the bumper is in the range of 45 to 55 degrees.