JPH11170987A - Cleaning method for automobile body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove refuse such as iron powders by supplying cleaning liquid into a floor toward a large-diameter hole used as a discharging hole of the cleaning liquid in the condition that a body is inclined, and by forming flows of the cleaning liquid on the floor surface for cleaning. SOLUTION: A relatively large diameter hole 11 such as a through hole of a steering rod is drilled in a dash panel DP of a body B of an automobile. This large diameter hole 11 is a hole drilled for any car type. Because the large diameter hole 11 in the dash panel DP is opened in a vertical surface or a tilting surface, for using this as a discharging hole of cleaning liquid, inclination of the body B is required to be larger. When the cleaning liquid is delivered from a nozzle 2 toward a floor surface FP in the condition that the body is sharply inclined front-down, this cleaning liquid flows along the floor surface FP toward the large diameter hole 11 in the dash panel DP. Thus, refuse such as iron powders adhered to the floor surface is cleaned and flowed by the cleaning liquid, and drops from the large diameter hole into a cleaning vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning method for a painting line of an automobile production line, and more particularly to a method for cleaning an automobile body capable of efficiently removing dust such as iron powder adhered in a previous process.

[0002]

2. Description of the Related Art In a production line of an automobile body, a white body after a welding process is subjected to various cleaning and degreasing processes such as pre-cleaning, washing, hot water washing, preliminary degreasing, and degreasing, and then a zinc phosphate film is formed on the body surface. Is sent to a chemical conversion treatment step for forming a chemical conversion film consisting of, and thereafter, an electrodeposition coating as an undercoat is applied.

In such a pretreatment / electrodeposition process, the white body is subjected to various surface treatments while being continuously and constantly conveyed by an overhead conveyor while being mounted on a hanger.

By the way, in a welding process which is a pre-process of the painting process, a body panel is joined by spot welding or arc welding and assembled, so that the iron powder such as spatter at the time of the spot welding adheres to the automobile body. Be brought to As described above, a multi-step cleaning step is provided in a step before the chemical conversion step in order to clean such foreign substances. In particular, as a method of removing metallic foreign matter such as iron powder, a method using a magnet, a method using a rotary separator, and the like have been proposed in addition to providing a filter in a circulation system.

[0005]

However, even with such a conventional method, it is extremely difficult to completely wash away fine and lightweight iron powder, and particularly, it is difficult to remove dust adhering to the floor. . Considering floor rigidity and water leakage, there is a restriction on vehicle design that only a small number of small-diameter drain holes can be formed on the horizontal surface of the floor.Therefore, in the coating cleaning process, a large amount of cleaning liquid is used. Because it cannot be washed away sufficiently.

[0006] If the iron powder that cannot be removed in the cleaning step is carried into the chemical conversion treatment tank while adhering to the body, the iron powder adhering to the surface of the steel sheet is buried in the chemical conversion film, and the electrodeposition coating film is placed thereon. When this is formed, coating film defects such as dust spots will be caused.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a method for cleaning an automobile body that can efficiently remove dust such as iron powder.

[0008]

According to a first aspect of the present invention, there is provided a method of cleaning a vehicle body, the method comprising: cleaning a vehicle body in a state where the body is inclined toward a large-diameter hole to be a discharge port of a cleaning liquid; The cleaning liquid is supplied into the floor, and the cleaning is performed while forming a flow of the cleaning liquid on the floor surface.

Since a large number of through-holes are formed on the floor surface of the automobile body in addition to the holes dedicated to draining water, the present invention selects a large-diameter hole from these various holes. Use it to clean the floor. In other words, the cleaning liquid is supplied toward the large-diameter hole using the large-diameter hole as a discharge port for the cleaning liquid, and the dust adhering to the floor is washed away while creating a flow of the cleaning liquid on the floor surface. Since the normal floor surface is substantially horizontal, cleaning is performed with the body inclined to increase the flow of the cleaning liquid.

According to another aspect of the present invention, there is provided a method of cleaning an automobile body, comprising the steps of: The inclination angle of the body is changed according to the inclination angle of the surface on which the large-diameter hole to be formed is formed, the cleaning liquid is supplied into the floor toward the large-diameter hole, and the flow of the cleaning liquid is formed on the floor surface. It is characterized by washing.

According to the second aspect of the present invention, the cleaning is performed while changing the inclination angle of the body to an appropriate angle according to the shape of the floor. Thus, even if the floor shape is changed, the flow of the cleaning liquid is appropriately formed on the floor surface, so that the cleaning efficiency is improved.

In the first and second aspects of the present invention, the large-diameter hole to be used as the discharge port for the cleaning liquid is not particularly limited. The body is inclined on a surface or an inclined surface so that the large-diameter hole is substantially horizontal.

According to another aspect of the present invention, the large-diameter hole is any one of a large-diameter hole formed in a dash panel, a rear combination lamp hole, and a back door opening. And

The dash panel hole and the rear combination lamp hole are formed at substantially the same position even if the vehicle type is different, and have a large diameter.

In the above invention, the method for supplying the cleaning liquid is not particularly limited, but the method for cleaning an automobile body according to claim 5 is characterized in that the cleaning liquid is supplied intermittently.

According to a sixth aspect of the present invention, in the method for cleaning an automobile body, the cleaning liquid is continuously supplied so that a flow of the cleaning liquid is formed on the floor surface, and most of the cleaning liquid is supplied to the large-diameter hole. The supply of the cleaning liquid is temporarily stopped until the cleaning liquid is discharged.

The cleaning liquid supplied to the floor is discharged from the large-diameter hole. If the supply amount per hour is larger than the discharge amount, the cleaning liquid will be accumulated in the floor. Garbage such as iron powder includes some that are lightweight,
Although there is a possibility that the dust floats on the liquid pool portion of the floor and is not discharged from the large-diameter hole, all the dust attached to the floor can be efficiently discharged.

In the above invention, the inclination angle of the body is not particularly limited, but the method of cleaning an automobile body according to claim 7 is characterized in that the inclination angle of the body is 40 ° to 60 °. By providing the inclination angle of 40 ° or more, the cleaning liquid is easily discharged from the dash panel hole and the rear combination lamp hole. When this is applied to the outlet part of the dipping tank, the amount of liquid taken out of the tank can be reduced. In addition, when applied to the tank section, the body is pressed against the paint hanger by the water pressure supplied into the floor, so that a separate body retaining device is not required. Furthermore, when applied to a tank entrance or a tank exit, the occurrence of air pockets is suppressed, leading to quality improvement.

On the other hand, if the angle exceeds 60 °, the gravitational force of the body exerts a large effect, resulting in a large load on the conveyor. Further, when the present invention is applied to the entry part or the exit part of the dipping tank, the buoyancy or water pressure of the water causes a large load on the conveyor.

[0020]

According to the first aspect of the present invention, since the cleaning liquid is supplied to the large-diameter hole and the floor surface is washed away by using the large-diameter hole as a discharge port for the cleaning liquid, a large amount of the cleaning liquid is supplied. And the cleaning efficiency is improved in each step.

According to the second aspect of the present invention, even if the floor shape is different, the flow of the cleaning liquid is appropriately formed on the floor surface, so that the cleaning efficiency is improved in each step.

According to the third and fourth aspects of the present invention, even if the type of vehicle is different, it is formed at substantially the same position, and a large-diameter hole can be used as a discharge port.

According to the fifth and sixth aspects of the present invention, all dust attached to the floor can be efficiently discharged, and a large amount of cleaning liquid can be supplied.

According to the seventh aspect of the present invention, the cleaning liquid is easily discharged from the dash panel hole and the rear combination lamp hole, and the cleaning efficiency is improved. Further, when the present invention is applied to a dipping tank, the amount of liquid taken out of the tank is reduced, the occurrence of air pockets is prevented, and the floating of the body is suppressed.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a cleaning line to which an embodiment of the method for cleaning an automobile body according to the present invention is applied, FIG. 2 is a side view showing a coating hanger used in the embodiment,
FIG. 3 is a front view of the coating hanger, FIG. 4 is a side view of the coating hanger to which another embodiment of the method of cleaning an automobile body according to the present invention is applied, and FIGS. 7 is a side view of a body for explaining the embodiment, FIG. 7 is a perspective view showing an automobile body, and FIG.
It is sectional drawing which follows the III-VIII line.

First, the cleaning process shown in FIG. 1 is provided, for example, before the chemical conversion coating process. The white body B, which has completed the welding process, is mounted on a coating hanger H and is moved by an overhead conveyor C. It is transported at a constant speed. In FIG. 1, the sheet is conveyed from left to right.

In the cleaning process of this embodiment, a vertical portion C1 is set on the overhead conveyor C, and the body B to be conveyed first tilts downward in the vertical portion C1, then returns to horizontal, and finally ends upward. It is transported while tilting.

The vertical tank C1 is provided with a cleaning tank 1 in which a cleaning liquid L is stored. The cleaning tank 1 may be filled with the cleaning liquid L to serve as a dipping cleaning tank, or may be used as a mere cleaning tank by storing the cleaning liquid L in a part. In this example, the washing tank 1 contains an amount of washing liquid L necessary for circulation.
Is to be stored.

A circulating pipe 3 having a nozzle 2 is provided on both sides of the inlet section and the outlet section of the cleaning tank 1, and a pump P sucks the cleaning liquid L in the cleaning tank 1 and a filter. After the dust is filtered by F, the cleaning liquid L is supplied to the interior of the inclined body B. This nozzle 2 is shown in FIGS.
As shown in FIG. 7, the cleaning liquid L is discharged from the side window opening of the body B toward the floor FP in the room, and the flow of the cleaning liquid L is formed on the floor surface FP as shown in FIG.
By the way, the cleaning liquid L supplied to one body B
Is preferably about 200 to 2000 l / min.

It should be noted that the specific shape, quantity or arrangement of the nozzles 2 is not particularly limited.
It suffices if the flow of the cleaning liquid L occurs in P.

The inclination angle of the vertical portion C1 in the cleaning line shown in FIG.
It is desirable to have a steep inclination of about 60 °. in this case,
The inclination angle of the overhead conveyor C is 40 ° to 6
The inclination angle of the body B may be set to 40 ° to 60 ° by using a coating hanger H having a variable inclination angle described later.
° may be. If it is desirable to change the angle of inclination of the body B according to the type of vehicle in a line in which a plurality of types of vehicles are mixed, a paint hanger H having a variable angle of inclination is used. It is preferable to provide a guide rail that can be changed to the following.

Next, the coating hanger H in which the inclination angle of the body B is variable will be described. As shown in FIGS. 2 and 3, the overhead conveyor C includes a free rail FR on which a coating hanger H is suspended and a power rail on which a driving chain (not shown) connected to a driving unit (not shown) rotates. And a pin (not shown) attached to the drive chain at regular intervals.
The coating hanger H is conveyed by pushing the hooking portion 21 formed at the tip of.

The coating hanger H used in the present embodiment is:
The main body 22 is suspended from the free rail FR, and the movable part 23 is supported by the main body 22. The body B is attached to the attachment 24 as shown in FIG.
Is mounted on the movable portion 23 through the
Is supported by the main body 22 at or near the points P1 and P2 shown in FIG. 2, and is moved by the vertical movement of a guide roller 25 provided at the upper end of the movable portion 23 as shown in FIG. About the fulcrum as shown by the dashed line in FIG.

That is, a guide roller 25 shown in FIG. 3 is fixed to each of the front side and the rear side of the coating hanger H so as to protrude upward.
Slides along a guide rail 26 provided separately from the power rail PR and the free rail FR. Also, the width W of the front guide roller 25 and the width of the rear guide roller 25 are different.
Are different from each other, and similarly, the guide rails 26, 26 corresponding to the respective guide rollers 25 also have different widths so as not to overlap each other. Although four guide rollers 25 are provided for all the coating hangers H, guide rails 26 for guiding the guide rollers 25 are provided only at positions where the inclination of the body B is desired to be changed. For example, it is a tank section and a tank section of the cleaning tank 1 shown in FIG.

When the coating hanger H having such a variable inclination angle is used, the movable portion 23 of the coating hanger H can be set at one of the points P1 and P2 only by setting the height and the trajectory of the guide rail 26 as desired. The inclination angle changes in the front-back direction. At this time, as shown in FIG. 4, a plurality of guide rails 26 may be provided, and a guide rail corresponding to the desired inclination angle may be appropriately selected at a position where the inclination angle is desired to be changed. In the figure, an introduction rail 27 is provided at the entrance of the guide rail 26 so as to be rotatable around a fulcrum P3, and the introduction rail 27 is stepped using a driving means such as an air cylinder 28. Works. In this example, the guide rail 26 has three steps (a to
c) Since it is provided, three types of inclination angles can be selected.

Next, a cleaning method will be described. As shown in FIG. 7, a dash panel DP of a vehicle body B has a relatively large hole 1 such as a through hole for a steering rod.
1 has been established. The rear panel RP is also provided with a large-diameter hole 12 such as a through hole for a rear combination lamp. These holes 11 and 12 are provided in the floor panel FP
This is a hole that is larger than the drainage hole for the painting process that was opened in the same country, and is a hole that is opened in all car models. In the present embodiment, the large-diameter holes 11 and 12 are used as a discharge port of the cleaning liquid L. However, the large-diameter hole 11 of the dash panel DP and the large-diameter hole 12 of the rear panel RP
Is provided on a vertical surface or an inclined surface. When this is used as an outlet for the cleaning liquid L, the body B
It is necessary to increase the inclination.

In view of this, as shown in FIG. 1, in each of the entry section and the exit section of the washing tank 1, the inclination of the body B, which is usually around 30 °, is applied by using the above-mentioned coating hanger H having a variable inclination angle. The cleaning liquid L is supplied from the nozzle 2 to the floor surface F of the room in the state where the angle is 40 ° to 60 ° and the steeply inclined state.
Supply to P. FIG. 5 is a view showing a state of the flow of the cleaning liquid in the entrance section, and FIG. 6 is a view showing a state of the flow of the cleaning liquid L in the exit section. As shown in FIG. When the cleaning liquid L is discharged from the nozzle 2 toward the floor surface FP in this state, the cleaning liquid L flows along the floor surface FP toward the large-diameter hole 11 of the dash panel DP. At this time, dust such as iron powder attached to the floor surface is washed away by the cleaning liquid L, and falls from the large-diameter hole 11 into the cleaning tank 1. Also in the tank section shown in FIG.
Is discharged toward the large-diameter hole 12 in the rear panel RP along the floor surface FP. At this time, dust such as iron powder attached to the floor surface is washed away by the cleaning liquid L and falls into the cleaning tank 1 from the large-diameter hole 12.

At this time, it is desirable that the cleaning liquid L supplied from the nozzle 2 be supplied intermittently. That is, FIG.
As shown in FIG. 6, when the cleaning liquid L is supplied to the room for a certain period of time, the cleaning liquid L may accumulate around the large-diameter holes 11 and 12. Since light dust such as iron powder easily floats in the liquid pool, it is desirable to supply the next cleaning liquid L when almost all of the cleaning liquid has passed through the large-diameter holes 11 and 12. .

By the way, in the multi-vehicle type mixing line, since the shape of the floor panel FP is different and the setting position of the large-diameter hole suitable for the outlet of the cleaning liquid L is slightly different, the inclination angle is set according to the vehicle type. In addition, it is preferable that a plurality of guide rails 26a to 26c shown in FIG.

The embodiments described above are described for facilitating the understanding of the present invention, and are 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.

For example, the large-diameter hole used as the outlet for the cleaning liquid L is not limited to the through-hole of the dash panel or the rear combination lamp hole, and a hole suitable for the type of vehicle may be selected. Further, the cleaning method of the present invention can be applied not only to the entrance section and the exit section of the cleaning tank 1, but also to the cleaning while tilting the body by about 20 ° in the horizontal transfer section of the conveyor. In short, the cleaning liquid L
What is necessary is just to wash away garbage while forming the flow of.

[Brief description of the drawings]

FIG. 1 is a side view of a cleaning line showing an embodiment of a method for cleaning an automobile body of the present invention.

FIG. 2 is a side view showing a coating hanger used in the embodiment of FIG.

FIG. 3 is a front view showing a coating hanger used in the embodiment of FIG. 1;

FIG. 4 is a side view of a coating hanger showing another embodiment of the method for cleaning an automobile body of the present invention.

FIG. 5 is a side view of the body showing the embodiment of the method for cleaning an automobile body of the present invention.

FIG. 6 is a side view of the body showing an embodiment of the method for cleaning an automobile body of the present invention.

FIG. 7 is a perspective view showing an automobile body.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7;

[Explanation of symbols]

 B ... Car body C ... Overhead conveyor C1 ... Vertical part FP ... Floor DP ... Dash panel RP ... Rear panel 1 ... Washing tank 2 ... Nozzle 3 ... Circulation piping 11,12 ... Large diameter hole H ... Coating hanger 22 ... Main body 23 … Movable part 25… guide roller 26… guide rail 27… rail for introduction 28… air cylinder

Claims (7)

[Claims] 1. A cleaning liquid is supplied into a floor toward a large-diameter hole to be a discharge port of a cleaning liquid while the body is inclined, and the cleaning is performed while forming a flow of the cleaning liquid on the floor surface. How to wash the car body. 2. A cleaning line in which a plurality of types of bodies having different floor shapes are mixed and charged, and the body is inclined according to an inclination angle of a surface on which a large-diameter hole to be a discharge outlet of a cleaning liquid is formed. A method for cleaning an automobile body, comprising: changing an angle, supplying a cleaning liquid into the floor toward the large-diameter hole, and performing cleaning while forming a flow of the cleaning liquid on the floor surface. 3. The large-diameter hole according to claim 1, wherein the large-diameter hole is formed in a vertical or inclined surface of the floor, and the body is inclined so that the large-diameter hole is substantially horizontal. How to clean the car body. 4. The large-diameter hole is one of a large-diameter hole formed in a dash panel, a rear combination lamp hole, and a back door opening.
4. The method for cleaning an automobile body according to any one of the above items 3. 5. The method for cleaning an automobile body according to claim 1, wherein the cleaning liquid is supplied intermittently. 6. The cleaning liquid is continuously supplied so that a flow of the cleaning liquid is formed on the floor surface, and the supply of the cleaning liquid is temporarily stopped until most of the cleaning liquid is discharged from the large-diameter hole. The method according to claim 5, wherein the vehicle is stopped. 7. The method for cleaning an automobile body according to claim 1, wherein the inclination angle of the body is 40 ° to 60 °.