JP3796925B2 - How to paint a car body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating method used when an intermediate coating material and a top coating material (solid type top coating material, metallic base coating material, clear coating material) are applied to an automobile body.
[0002]
[Prior art]
As a coating system for an automobile body, a three-coat system such as an undercoat coating mainly performed by an electrodeposition coating method, an intermediate coating and a top coating mainly performed by an electrostatic coating method is employed.
[0003]
Of these, various types of electrostatic paint guns such as bell-type paint guns and air spray-type paint guns are widely used for intermediate paint and top coat paint, and automating the paint by installing them on a painting robot or special paint machine. Has been done.
[0004]
For example, when painting a side surface of a body, a conventional painting method using a special painting machine applies a painting gun attached to the special machine to a car body B conveyed at a constant speed as shown in FIG. In this way, the paint is sprayed on the side of the body. At this time, in the vicinity of the top dead center and the bottom dead center of the reciprocating motion, the discharge amount of the coating gun is set to 0, that is, turned off. The solid line and the dotted line in the figure indicate the absolute movement trajectory of the coating gun. The solid line indicates the state where the discharge of the paint is ON, and the dotted line indicates the state where the discharge of the paint is OFF.
[0005]
Further, as a method of painting the side surface of the body using the painting robot, for example, as shown in FIG. 7, the side surface of the body B is divided into regions of a fender B1, a front door B2, a rear door B3, and a quarter B4. In this region, the paint gun is reciprocated in the traveling direction of the body. Also in this case, the discharge of the paint is turned off at both ends of each reciprocating motion.
[0006]
[Problems to be solved by the invention]
In the conventional coating method described above, the paint is cut at both ends of each reciprocating motion mainly to prevent thickening, coating unevenness (spots), and eventually paint sagging. In other words, when painting is performed by reciprocating the painting gun, the gun speed at both ends is the slowest, but always painting at a constant discharge rate results in the thickest film thickness at the part where the gun speed was slowed down, This is because unevenness and paint sagging occur. In addition, overspray occurs at both ends of the reciprocating motion, and the coated skin of the overlying portion is lowered, so that the minimum required coating range is used to prevent this. Furthermore, in order to prevent such thickening or overspraying, the movement trajectory of the paint gun is overhanged larger than the painting area of the body. In this case, in order to reduce wasted paint as much as possible. The paint is cut.
[0007]
However, in such a conventional reciprocating coating method, since the discharge of the paint at both ends is cut, the effective work rate (effective work time) is only 50% to 70%, and the remaining 30% to 50% is wasted time. It becomes. There was a problem that the required coating time per unit became long and productivity was lowered.
[0008]
In addition, when the paint is turned off at both ends of the reciprocating motion, the paint dust inevitably adheres to the surface of the body. In order to prevent this, it is important to select a region in which reciprocating motion is performed, that is, where the paint is to be cut. Therefore, there are certain restrictions on the setting of the coating gun trajectory.
[0009]
The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a method for painting an automobile body that can improve the effective work rate of painting work and improve the quality of the skin to be painted. And
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided a method for painting an automobile body according to the first aspect of the invention, in which the automobile body is painted using a painting gun. The coating gun is continuously moved along a substantially circular or substantially elliptical stroke trajectory with respect to a partial area, and coating is performed while continuously discharging the paint.
[0011]
In the method of painting an automobile body according to claim 1, since the painting gun is continuously moved and the paint is applied while being continuously discharged, the effective work rate of the painting gun is almost 100%. The painting time required per machine is shortened and the productivity of the painting process is improved.
[0012]
In addition, there are no problems due to wasted paint dust due to overhang (such as paint dust adhering to the body), and since paint is discharged continuously, correction coating is not required, and the skin is expected to improve. it can. Furthermore, since the paint is not cut, the number of ON / OFF times of the paint discharge amount control valve is remarkably reduced, and the service life of the coating equipment is increased, thereby contributing to cost reduction.
[0013]
Furthermore, by making the movement trajectory of the coating gun a single stroke, it is possible to make the discharge amount uniform on the surface to be coated, and to prevent a thin film or a thick film from being formed.
[0015]
In addition , since the coating gun is moved in a substantially circular shape or a substantially elliptical shape, the painting robot and the dedicated painting machine are easy to operate, and the speed of the painting gun is fast and stable (stabilized). By increasing the gun speed, the time required for painting per machine is further shortened, and the number of painting robots required can be reduced. Further, stabilization of the gun speed simplifies the variation control of the discharge amount, and a simple control device is sufficient.
[0016]
On the other hand, the method for painting an automobile body according to claim 2 according to the second aspect of the present invention is the method for painting an automobile body in which the automobile body is painted using a painting gun, and the automobile body is linearly moved in a certain direction. The paint gun is applied while being moved by a combination of a substantially circular movement or a substantially elliptical movement or a linear movement in the direction, and the paint is continuously applied to at least a part of the region of the automobile body. It is characterized by painting while discharging .
[0017]
When painting an automobile body, paint it while the automobile body is stopped, or paint while moving the automobile body. The method of painting an automobile body according to the first aspect described above captures the automobile body and the painting gun as a relative operational relationship. When painting with the automobile body stopped, the automobile body is moved. It is intended to include both when painting.
[0018]
On the other hand, the automobile body painting method according to claim 2 is mainly for painting while moving the automobile body.
That is, in the method of painting an automobile body according to claim 2 , the automobile body is linearly moved in a certain direction, and the painting gun is moved by a substantially circular movement, a substantially elliptical movement, or a combination of this and a linear movement in the direction. In this way, the paint can be continuously discharged, and the effective work rate of the paint gun is almost 100%, as in the automobile body painting method according to claim 1. Coating time is shortened and productivity of the painting process is improved.
[0019]
In addition, there are no problems caused by wasteful paint dust due to overhang (such as adhesion of paint dust to the body), and the paint can be discharged continuously. As a result, correction coating is not required and the skin is improved. I can expect. In addition, since there is no need to cut the paint, the number of ON / OFF times of the paint discharge amount control valve is remarkably reduced, and the service life of the coating equipment is increased, thereby contributing to the reduction in maintenance costs.
[0020]
Further, in the method of painting an automobile body according to claim 2, since the relative movement trajectory of the painting gun with respect to the automobile body is a single stroke, it is possible to achieve a uniform discharge rate on the surface to be coated. A thick film can be prevented.
[0021]
In addition, since the movement trajectory of the one-stroke writing at this time is substantially circular or elliptical, the painting robot and painting machine are easy to operate, and the painting gun speed is fast and stable (stabilized). Become. By increasing the gun speed, the time required for painting per machine is further shortened, and the number of painting robots required can be reduced. Further, stabilization of the gun speed simplifies the variation control of the discharge amount, and a simple control device is sufficient.
[0023]
In the automobile body painting method according to the first and second aspects described above, the area of the automobile body is not particularly limited. However, as in the automobile body painting method according to claim 3 , body side, hood, roof, More preferably, it is divided by a trunk hood. This is because the painting area of a conventional general automobile body can be divided at least in this way. In this way, the number of paint cuts can be minimized.
[0024]
In the automobile body painting method according to the first and second aspects described above, examples of the painting gun to be used include an air spray gun and a bell type painting gun, and although not limited thereto, an electrostatic painting gun in terms of coating efficiency, In particular, a bell-type paint gun is more preferable as in the method for painting an automobile body according to claim 4 . This is because the paint pattern is stable, the generation of paint dust is extremely small, and the coating efficiency is excellent.
[0025]
In the automobile body painting method according to the first and second aspects described above, the painting gun may be either hand-blown or automatic. In the case of an automatic machine, either a dedicated machine or a painting robot may be used. If the paint gun is attached to a painting robot as in the automobile body painting method according to claim 5 , the above-described effect becomes even more remarkable.
[0026]
The above-described automotive body coating methods according to the first and second aspects can be applied to intermediate coating and top coating. In top coating, all coating methods such as solid coating, metallic base coating, and clear coating are applied. Applicable to top coating.
[0027]
【The invention's effect】
According to the method for painting an automobile body according to the first aspect, the effective work rate of the painting gun is almost 100%. As a result, the painting time required for one machine is shortened, and the productivity of the painting process is improved. In addition, since the paint is continuously discharged, no paint dust adheres to the body. As a result, no correction coating is required, and an improvement in the coated skin can be expected. Furthermore, since the paint is not cut, the number of ON / OFF times of the paint discharge amount control valve is remarkably reduced, and the service life of the coating equipment is increased, thereby contributing to cost reduction.
[0028]
Further , it is possible to make the discharge amount uniform with respect to the surface to be coated, and it is possible to prevent the film from being thin or thick.
[0029]
In addition , the painting robot and the painting machine are easy to operate, and the painting gun speed is fast and stable (fixed). By increasing the gun speed, the time required for painting per machine is further shortened, and the number of painting robots required can be reduced. Further, stabilization of the gun speed simplifies the variation control of the discharge amount, and a simple control device is sufficient.
[0030]
According to the method for painting an automobile body according to claim 2 , the paint can be continuously discharged, the effective work rate of the paint gun is almost 100%, and as a result, the painting time required for one vehicle is shortened. The productivity of the painting process is improved. In addition, since the paint can be continuously discharged, no paint dust adheres to the body, and as a result, no correction coating is required, and an improvement in the coated skin can be expected. In addition, since there is no need to cut the paint, the number of ON / OFF times of the paint discharge amount control valve is remarkably reduced, and the service life of the coating equipment is extended, thereby contributing to cost reduction.
[0031]
Further, since the relative moving locus of the spray gun for automotive body becomes single stroke manner, can be made uniform in the discharge amount with respect to the coated surface, it is prevented from being thin or thick. In addition, since the movement trajectory of the one-stroke writing at this time is substantially circular or elliptical, the painting robot and painting machine are easy to operate, and the painting gun speed is fast and stable (stabilized). Become. By increasing the gun speed, the time required for painting per machine is further shortened, and the number of painting robots required can be reduced. Further, stabilization of the gun speed simplifies the variation control of the discharge amount, and a simple control device is sufficient.
[0032]
According to the method for painting an automobile body described in claim 3 , in addition to the effect of the invention described in claim 3, the number of paint cuts (ON / OFF) can be minimized.
[0033]
According to the method for painting an automobile body according to claim 4 , the paint pattern is stable, the generation of paint dust is extremely small, and the coating efficiency is excellent.
[0034]
According to the method for painting an automobile body according to the fifth aspect , since the painting gun is mounted on the painting robot, the above-described effects become more remarkable.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a body showing an embodiment of an automobile body painting method of the present invention, and FIG. 5 is a perspective view showing a concrete painting means. FIGS. 2 to 4 are a body side view and a body plan view showing another embodiment of the automobile body painting method of the present invention.
[0036]
In the painting method of the present embodiment, as shown in FIG. 5, a bell type painting gun G is used, and a painting robot R is used to move the bell type painting gun G. One or more painting robots R are arranged on the left and right sides of the vehicle body B, and the vehicle body B that is the object to be coated is transported in the painting booth at a constant speed by the floor conveyor while being mounted on the painting carriage D. The
[0037]
The procedure of the painting method of this embodiment will be described. First, when the automobile body B is transported into the painting booth, the painting robot R is circular so as to include the upper and lower ends of the body side shown in FIG. The movement is started and the bell-shaped paint gun G is moved circularly at a constant speed. When the front end of the body B reaches the position of the bell type paint gun G, the paint starts to be discharged from the bell type paint gun G. Since the body B mounted on the painting carriage D is being conveyed at a constant speed in the direction of the arrow, the relative trajectory drawn by the bell-type painting gun G with respect to the body B is a substantially continuous circle as shown by the solid line in the figure. It becomes a stroke stroke trajectory. When the paint gun G reaches the rear end of the body B, the paint is cut and waits until the next body arrives.
[0038]
Depending on the relationship between the conveyance speed of the body B and the circular movement speed of the painting gun G, the painting gun G may be combined with not only a circular movement but also a linear movement with respect to the conveyance direction of the body B. That is, as a whole, the coating gun G may be moved forward or backward in the transport direction of the body B while moving the coating gun G in a circular motion. Also, since the front wheel arch part and rear wheel arch part exist on the body side, the circular motion of the paint gun G is not always the same diameter, and the diameter is partially changed so that a useless locus does not occur. It is desirable to use a circular motion.
[0039]
Furthermore, it is important to set the trajectory of the circular motion so that the pattern that is discharged from the bell-shaped paint gun G is properly applied. Therefore, the movement trajectory of the coating gun G is not limited to the circular motion but may be an elliptical motion.
[0040]
FIG. 2 shows another embodiment of the movement trajectory of the coating gun G. The embodiment of FIG. 1 is substantially circular, whereas the embodiment of FIG. Move paint gun G to. By doing so, the length of the locus close to a straight line increases, so that the gun speed can be increased and the actual coating time per unit can be shortened.
[0041]
When such a substantially elliptical trajectory is employed, it is desirable to set the top and bottom polarities shown in FIG. 2 as large as possible. This is because the smaller the top and bottom poles, that is, the sharper the trajectory, the smoother the movement of the painting robot at the turning part and the slower the gun speed.
[0042]
3 and 4 show an embodiment in which the horizontal surface of the automobile body, that is, the hood B5, the roof B6 and the trunk hood B7 are painted. In the embodiment of FIG. 3, the body B is moved at a constant speed in the direction of the arrow. While being conveyed, the horizontal bell-shaped paint gun G is moved in a substantially circular shape or a substantially elliptical shape.
[0043]
At this time, when the hood B5 is applied, when the roof B6 is applied, and when the trunk hood B7 is applied, the paint is turned ON / OFF only three times in total, and the regions B5, B6, and B7 are applied. During that time, the paint is discharged.
[0044]
On the other hand, in the embodiment of FIG. 4, the coating gun G is rotated in a substantially circular shape or a substantially elliptical shape while conveying the body B at a constant speed in the direction of the arrow, and either the left or right of the body B (see FIG. In this example, the entire coating gun G is moved from the left side to the other side at a constant speed. Further, when the coating area is large, such as the roof B6, such an operation can be repeated a plurality of times in the transport direction as shown in FIG. However, the paint from the paint gun G continues to be discharged.
[0045]
Thus, according to each embodiment of the present invention, the paint is applied while being continuously discharged without frequently being turned ON / OFF, so that most of the time during which the paint gun G is operating is effective work time. Thus, the effective work rate is almost 100%. As a result, the painting time required for one vehicle is shortened, and the productivity of the painting process is improved.
[0046]
In addition, since the paint can be continuously discharged, the paint dust does not adhere to the body B. As a result, correction coating is not necessary, and improvement of the coating skin can be expected. In addition, since there is no need to cut the paint, the number of ON / OFF times of the paint discharge amount control valve is remarkably reduced, and the service life of the coating equipment is extended, thereby contributing to cost reduction.
[0047]
Further, it is possible to make the discharge amount uniform with respect to the surface to be coated, and it is possible to prevent the film from being thin or thick. Furthermore, since the movement trajectory of the painting gun G is substantially circular or elliptical, the painting robot R and the painting dedicated machine are easy to operate, and the painting gun G speed is fast and stable (constant). Become. By increasing the gun speed, the time required for painting per machine is further shortened, and the number of painting robots required can be reduced. Further, stabilization of the gun speed simplifies the variation control of the discharge amount, and a simple control device is sufficient.
[0048]
The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[0049]
In the embodiment described above, a bell-type paint gun is used as the paint gun G, but the present invention is not limited to the bell-type paint gun, and other paint guns can be used. In addition, since the painting method of the present invention requires a simple movement locus, a dedicated automatic machine other than the painting robot R can be sufficiently used.
[Brief description of the drawings]
FIG. 1 is a side view of a body showing an embodiment of an automobile body painting method of the present invention.
FIG. 2 is a side view of the body showing another embodiment of the method for painting an automobile body of the present invention.
FIG. 3 is a body plan view showing another embodiment of a method for painting an automobile body of the present invention.
FIG. 4 is a body plan view showing another embodiment of the method for painting an automobile body of the present invention.
FIG. 5 is a perspective view showing another embodiment of the automobile body painting method of the present invention.
FIG. 6 is a side view of a body showing a conventional method of painting an automobile body.
FIG. 7 is a side view of a body showing a conventional method for painting an automobile body.
[Explanation of symbols]
B ... Car body B1 ... Fender B2 ... Front door B3 ... Rear door B4 ... Quarter B5 ... Hood B6 ... Roof B7 ... Trunk hood G ... Paint gun R ... Paint robot

Claims (5)

In a method of painting an automobile body using a painting gun to paint the automobile body, the paint gun is continuously moved in a substantially circular or substantially elliptical stroke with respect to at least a part of the area of the automobile body. The method of painting an automobile body is characterized in that the paint is applied while continuously discharging the paint. In a method of painting an automobile body that paints an automobile body using a painting gun, the automobile body is linearly moved in a certain direction, and the painting gun is moved in a substantially circular or substantially elliptical manner or in a linear movement in the direction. A method of painting an automobile body, wherein the painting is carried out while being moved in combination, and at least a part of the area of the automobile body is coated while being continuously discharged. 3. The method of painting an automobile body according to claim 1 , wherein the area of the automobile body is divided by a body side, a hood, a roof, and a trunk hood. 4. The method of painting an automobile body according to claim 1 , wherein the painting gun is a bell type painting gun. 5. The method of painting an automobile body according to claim 1 , wherein the painting gun is attached to a painting robot.

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