JPH0448969A - Painting method for automobile body - Google Patents

Abstract

PURPOSE:To enhance working efficiency by carrying out a secondary anti-corrosive treatment process after an appearance ensuring process to prevent the adhesion of dust to a painting surface and separately subjecting the car main body and lid body separated in a lid body detaching process to the anti-corrosive work of the secondary anti-corrosive treatment process. CONSTITUTION:In a primary anti-corrosive treatment process 1, pretreatment work 2 and electrodeposition painting work 3 are applied to the car body X of an automobile in such a state that a lid body Z such as a door is attached to a car main body Y. In the succeeding appearance ensuring process 4, topcoating work 7 applying topcoating to at least the car body X to bake the coated car body is carried out. Further, in a lid body detaching process 9, the lid body Z is detached from the main body Y. In a secondary anti-corrosive treatment process 21, the lid body Z detached from the main body Y in the process 9 is fed on a lid body feed line B to carry out lid body anti-corrosive work 16 such as sealing coating work 17 and inner wax coating work 19 and the car body X from which the lid body Z is detached in the process 9 is fed on a car body feed line A to carry out car body anti-corrosive work 10 such as sealing work 11.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for painting an automobile body.

(Prior Art) Conventionally, as shown in FIG. 2, in this type of painting method for an automobile body, an automobile body It is known to paint X.

Using this type of painting method, the automobile body X is first subjected to a primary rust prevention treatment step 51. The primary rust prevention treatment step 51
is composed of a pretreatment work 52 and an electrodeposition coating work 53 performed after the pretreatment work 52.

In the pretreatment operation 52, the automobile body X is degreased and cleaned, and then a zinc phosphate-based anti-rust paint or the like is applied to the automobile body X. Next, in the painting work 53,
Epoxy paint or the like is applied to the automobile body X by electrodeposition, and the paint is baked. The pretreatment work 52 and the electrodeposition painting work 53 are aimed at improving the adhesion of the paint applied in the subsequent process and preventing rust, and these works are considered as the primary rust prevention treatment process 51. .

After the primary rust prevention treatment step 51, the automobile body X undergoes a secondary rust prevention treatment step 54. The secondary rust prevention treatment step 54
1 is comprised of a sealing material application operation 55 and an undercoat material application operation 56.

In the sealing material application operation 55 and the undercoat material application operation 56, vinyl chloride sealant, undercoat material, etc. are applied to the automobile body X and baked. The application work 55 of the sealing material and the application work 56 of the undercoat material are for the purpose of waterproofing, soundproofing, vibration proofing, rustproofing, etc., and these works are the secondary rust prevention treatment step 5.
It is said to be 4.

After the secondary rust prevention treatment step 54, the automobile body X undergoes an appearance guarantee step 57. The appearance guarantee process 57 includes an intermediate coating operation 58 and a top coating operation 59 performed after the intermediate coating operation 58.

In the intermediate coating work 58, an intermediate coating paint is applied to the automobile body X. After that, generally, an operation 60 of applying black paint to the door saturation part is performed, and an intermediate coating and a black paint are baked.Next, in a top coating operation 59,
A base coat paint and a clear paint are applied to the automobile body X, and operations 61 and 62 of baking the paint are performed. The intermediate coating work 58 and the top coating work 59 are intended to improve the appearance and weather resistance of the painted surface, and these works are considered as the appearance guarantee process 57.

Then, after the appearance guarantee step 57, a black paint is applied to the side sill portions of the automobile body X, and a baking operation 63 of the paint is performed. Next, an inspection step 64 is performed to determine whether correction of the painted surface is necessary or not, followed by an inner wax application step 65 in which paraffin wax or the like is applied.
A tertiary rust prevention treatment step 66 consisting of the following steps is performed. The inner wax application work 65 and the like are intended to prevent rust and finish the painted surface, and are referred to as a tertiary rust prevention treatment step 66.

However, the above-described coating method has the following disadvantages.

For one thing, in the sealant application work 55 of the secondary rust prevention treatment process 54, less work is performed by automatic machines than in the appearance guarantee process 57, and in the manual work, the workers wear dust-proof clothing, etc. Work while wearing. For this reason, there is a high possibility that clothing fiber dust, hair, etc. will adhere to the painted surface of the automobile body X, and if such dust adheres to the painted surface, there is a risk of causing a coating defect.

Secondly, in the undercoat material application operation 56 of the secondary rust prevention treatment step 54, the paint used during the undercoat material application operation 56 flies up in the form of fine particles and becomes dust, which is then deposited on the automobile body X. There is a risk that it may adhere to the surface and cause paint defects. Furthermore, if the paint in the form of fine particles adheres to the car body X, it is necessary to perform painting correction such as polishing the adhering part to remove dust and repainting the car body X, which requires a lot of effort. It takes.

Thirdly, the undercoat material application work 56:00, the intermediate coating work 60:00 after the application of the intermediate coat paint on the 5th day, and the inner wax application work 60:00.
Doors are opened and closed individually at 5 o'clock, etc. Therefore, the door must be opened and closed multiple times on the vehicle body transfer line 50, reducing work efficiency. Furthermore, it is not only necessary to install, for example, a door opener, etc. at each work position, but also the installation location is required, and the vehicle body transfer line 50
line length increases.

(Problems to be Solved by the Invention) The present invention solves these inconveniences, prevents dust from adhering to the painted surface, and improves the quality of the painting.
An object of the present invention is to provide a method for painting an automobile body that can improve work efficiency by eliminating work such as opening and closing doors.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for painting an automobile body, in which a degreasing process is applied to an automobile body in which a cover such as a door or a bonnet 7) is attached to the automobile body. A primary rust prevention treatment step in which pretreatment work such as cleaning and electrodeposition painting work is performed in which paint is applied and baked by electrodeposition, and after the first rust prevention treatment step, at least a top coat is applied to the automobile body. an appearance guarantee process in which a top coat is applied by baking the paint; a cover removal process in which the cover is removed from the car body after the appearance guarantee process; and a cover removal process in which the cover removed from the car body is removed from the car body in the cover removal process. The lid body is conveyed by the lid body conveyance line and subjected to rust prevention work such as sealing application work and inner wax application work, and the car body body from which the lid body has been removed in the lid body removal process is conveyed by the car body conveyance line and sealing is applied. Car body rust prevention work such as undercoat application work and inner wax application work 2
The present invention is characterized by comprising a second rust prevention treatment step.

(Function) When painting an automobile body by the above-described means, first, the automobile body is subjected to pretreatment such as degreasing and cleaning with the lids such as doors and bonnets attached in the primary rust prevention treatment step. Electrodeposition painting work is performed in which paint is applied and baked by work and electrodeposition.

Subsequently, the automobile body is subjected to a top-coating operation in which at least a top-coat paint is applied and the paint is baked in the appearance guaranteeing step.

Next, in the automobile body, lids such as doors and bonnets are removed from the vehicle body in the lid removal step. Thereby, when the second rust prevention treatment step is performed, the vehicle body and the lid removed from the vehicle body are transported by separate conveyance lines, and the second rust prevention treatment step is performed.

That is, the car body from which the lid has been removed in the lid removal process is transported by a car body transport line, and on the car body transport line, a sealing process, an undercoat application process, and, for example, a paraffin-based wax coating process are performed. Car body rust prevention work such as inner wax application work is performed. The lid removed from the vehicle body during the lid removal work is transported by a lid transport line, and a sealing application process is performed in which a colored sealant or a transparent sealant, such as vinyl chloride, is applied on the lid transport line. Rust prevention work will be carried out on the lid.

As described above, the secondary rust prevention treatment step is performed after the appearance guaranteeing step. As a result, even if dust is generated during sealing application work, undercoat application work, etc.,
Since the top coating work has already been completed on the automobile body, paint defects due to dust adhering to the painted surface are prevented.

Furthermore, since the secondary rust prevention treatment process is carried out after the lid removal process by transporting the vehicle body and the lid removed from the vehicle body by separate conveyance lines, the doors, etc. are removed in each process. The work of opening and closing is eliminated, making it possible to perform each rust prevention work efficiently.

(Example) An embodiment of the present invention will be described based on the drawings.

FIG. 1 is a schematic diagram showing the steps of this embodiment.

1 in Figure 1 is a pre-treatment work 2 in which a car body X with a lid 2 such as a door or bonnet attached is degreased and cleaned, and after the pre-treatment work 2, a paint is applied by electrodeposition and baked. 4 is a primary rust prevention treatment step consisting of a painting operation 3; after the primary rust prevention treatment step 1, an intermediate coating operation 5 of applying and baking an intermediate coating paint to the automobile body X; and then a base coat paint is applied. Appearance guarantee process consisting of base coat painting work 6 in which temporary baking is performed, and top coat painting work such as clear painting work 7 in which clear paint is then applied and baked;
8 is an inspection process for inspecting whether or not correction is necessary in the painting of the automobile body X after the appearance guarantee process 4; 9 is an inspection process 8
After that, there is a lid removal step in which a lid Z such as a door is removed from the automobile body X. Furthermore, 10 is the lid removal step 9
The sealing process 11 described below is applied to the vehicle body Y from which the lid Z has been removed. Undercoat application work 12. A car body rust prevention treatment process in which inner wax application work 13 is sequentially carried out; 14 is a car body assembly process in which the car body Y is assembled after the car body rust prevention treatment process 10; 15 is a car body assembly process in which the lid body Z is removed in the lid body removal process 9; The lid Z is reattached to the vehicle body Y, which has been removed, and is a process. Each of these steps 1. 4
．． 8. 9.10.14.15 are arranged along the vehicle body conveyance line A that conveys the automobile body X.

Further, in the figure, 16 indicates a sealing coating operation 171M, which will be described later, on the lid Z removed from the automobile body X in the lid removal step 9. A penalty color painting operation 18. A lid rust prevention treatment step in which inner wax application work 19 is sequentially performed, and 20 is a lid assembly step in which the lid Z is assembled after the lid rust prevention treatment step 16. Each of these steps 1620 is arranged along the lid conveyance line B that conveys the lid Z removed from the automobile body X in the lid removal step 9.

Note that the vehicle body rust prevention treatment step 10 and the lid body rust prevention treatment step 16 constitute a secondary rust prevention treatment step 21.

In the painting method of this embodiment having the above configuration, the car body X is painted by the following procedure.

First, the automobile body X is transported along the vehicle body transport line A, and a primary rust prevention treatment step 1 is performed. The primary rust prevention treatment step 1 is composed of a pretreatment operation 2 and an electrodeposition coating operation 3 performed after the pretreatment operation 2.

In the pretreatment work 2, the car body X is cleaned with skin oil, and then a zinc phosphate-based anti-rust paint or the like is applied to the car body X. Next, in the electrodeposition coating operation 3, an epoxy paint or the like is applied to the automobile body X by electrodeposition, and the paint is baked.

Next, the automobile body X undergoes an appearance guaranteeing step 4.

The appearance guarantee process 4 is composed of an intermediate coating work 5, a base coat painting work 6, and a clear painting work 7.

In the intermediate coating work 5, intermediate coating paint is applied to the automobile body X and baked. Next, in a base coat painting operation 6, a base coat paint is applied to the automobile body X, and the paint is temporarily baked. Thereafter, in a clear painting operation 7, a clear paint is applied to the automobile body X and the paint is baked.

As described above, since the primary rust prevention step 1 and the appearance guarantee step 4 are usually performed by automatic machines, it is possible to prevent the generation of artificial dust.

The automobile body X for which the appearance guaranteeing process 4 has been completed is inspected in the inspection process 8 to determine whether or not correction of the paint is necessary.

Thereafter, the lid Z is removed from the vehicle body X in the lid removal step 9.

The vehicle body Y from which the lid Z has been removed is subsequently conveyed by the vehicle body conveyance line A.

Here, the vehicle body Y whose paint needs to be corrected in the inspection step 8 is transported by another transport line (not shown), the correction portions are corrected, and then inspected again in the inspection step 8.

The vehicle body Y whose paint correction is not required in the inspection step 8 is transported by the vehicle body transport line A, and is subjected to the vehicle body rust prevention treatment step 10, which is a secondary rust prevention treatment step 21. The car body rust prevention treatment process IO is composed of a sealing application work for applying a sealant, an undercoat application work 12 for applying an undercoat material, and an inner wax application work 13 for applying wax.

In the sealing application work 11, a vinyl chloride sealant is applied to the vehicle body Y and baked. Next, in an undercoat application operation 12, a vinyl chloride-based undercoat material or the like is applied to the vehicle body Y and baked. After the undercoat application operation 12,
An inner wax application operation 13 is performed in which paraffin wax is applied. Although not shown, after the undercoat application step 12, a different color paint such as black paint may be applied to the side sill portions of the vehicle body Y, and the paint may be baked.

As described above, in the car body rust prevention treatment step 10, the secondary rust prevention treatment step 21, which was conventionally performed by opening and closing the door, is performed after the appearance guarantee step 4, so that the sealing application work 11, the underside The coat application work 12 and the inner wax application work 13 are combined after the appearance guarantee process 4. Further, since the vehicle body rust prevention treatment step 10 is performed on the vehicle body Y from which the lid Z has been removed in the lid removal step 9, the work of opening and closing the door is eliminated, improving work efficiency.

After that, the car body Y after the car body rust prevention treatment step 10 has been completed.
Then, a vehicle body assembly process 14 is performed. The vehicle body assembly process 14
Then, after rubber grommet material, Melsheet material, etc. are applied to the vehicle body Y, assembly work is performed. The vehicle body Y, which has been assembled in the vehicle body assembly step 14, is transported by the vehicle body transport line A toward a step 15 in which the lid body is attached.

On the other hand, the vehicle body X is removed by the lid removal step 9.
The lid Z removed from the vehicle body is transported by a lid transport line B that is separate from the vehicle transport line A in synchronization with the transport speed of the vehicle body Y that is transported by the vehicle transport line A.

The lid Z is transported by the lid transport line B and subjected to the lid rust prevention treatment step 16 of the secondary rust prevention treatment step 21. The lid rust prevention treatment step 16 is comprised of a sealing application work 17 for applying a sealant, a lid separate color painting work 18, and an inner wax application work 19.

In the sealing application work 17, a vinyl chloride sealant is applied to the lid Z and baked, similar to the sealing application work 11 to the vehicle body Y described above. Next, in the lid body separate color painting operation 18, a different color paint such as black paint is applied to the door sash portion, etc., and the paint is baked. Here, the lid Z whose coating needs to be corrected in the inspection step 8 is transported by another transport line (not shown), the correction location is corrected, and then returned to the lid transport line B again. After that, in an inner wax application operation 19, paraffin wax is applied.

As described above, in the lid rust prevention treatment step 16, the lid Z removed from the vehicle body Y in the lid removal step 9 is subjected to the lid rust prevention treatment step 16. The work of opening and closing is eliminated, improving work efficiency.

After that, the lid Z on which the lid rust prevention treatment step 16 has been completed,
A lid assembly process 20 is performed. In the lid assembly process 20, after rubber grommet material, Mel sheet material, etc. are applied to the lid Z, assembly work is performed.

The lid Z that has been assembled in the lid assembly process 20 is transported by the lid transport line B toward a lid attachment process 15.

Then, in step 15, the lid body attachment is performed, in which the lid body Z conveyed by the lid body conveyance line B is attached to the vehicle main body Y conveyed by the vehicle body conveyance line A.

As described above, the vehicle body Y and the lid Z are transferred to the vehicle body transport line A and the lid transport line B after the lid removal step 9.
The secondary rust prevention treatment step 21 is carried out separately in the separated state, which is transported and separated, and the secondary rust prevention treatment step 21 is performed after the appearance guaranteeing step 4. This not only improves work efficiency by eliminating the conventional work of opening and closing doors, but also eliminates the need to install, for example, a door opener at each work position, shortening the line length of vehicle body transfer line A. be able to.

(Effects of the Invention) As is clear from the above, according to the coating method of the present invention, the secondary rust prevention treatment step is performed after the appearance guaranteeing step, so the sealing application work and the undercoat application work are performed. Even if dust is generated due to dust, etc., the appearance guarantee process has already been completed for the automobile body, so it is possible to prevent paint defects due to dust adhering to the painted surface.

Furthermore, since the vehicle body and the lid separated in the lid removal process are separately subjected to rust prevention work in a secondary rust prevention treatment process, sealing application work, undercoat application work, and inner wax application work are performed separately. Each rust prevention work can be performed without opening and closing the door for each work.

Therefore, according to the present invention, it is possible to improve the coating quality by preventing dust from adhering to the painted surface, and furthermore, it is possible to improve the work efficiency by eliminating the work such as opening and closing the door. can provide a coating method.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the steps of an embodiment of the present invention, and FIG. 2 is a schematic diagram showing the steps of a conventional coating method. 1...Primary rust prevention treatment process 2...Pretreatment work 3...Electrodeposition coating work 4...Appearance guarantee process 7...Clear coating work (top coating work) 9...Lid body Removal process 10...Car body rust prevention treatment process (car body rust prevention work) 11, 1
7... Sealing application work 12... Undercoat? 4 Cloth work 13, 19... Inner wax application work 16...
Lid body rust prevention treatment process (M body rust prevention work) 21... Secondary rust prevention treatment process A... Vehicle body conveyance line B... Lid body conveyance line X... Automobile body Y... Vehicle body body Z...Lid body

Claims (1)

[Claims] 1. A method for painting an automobile body, in which a door, bonnet, etc. cover body is attached to the automobile body.
A primary rust prevention treatment process in which pretreatment work such as degreasing and cleaning, and electrodeposition painting work in which paint is applied and baked by electrodeposition;
After the primary rust prevention treatment step, an appearance guaranteeing step is performed in which a topcoating work is performed in which at least a topcoat is applied to the automobile body and the paint is baked; and a lid is removed from the car body after the appearance guaranteeing step. The lid body removed from the car body body in the body removal process and the lid body removal process is transported by a lid conveyance line, and lid rust prevention work such as sealing application work and inner wax application work is performed, and the lid body removal process is performed. A secondary rust prevention treatment step is carried out in which the vehicle body from which the lid has been removed in the process is transported through a vehicle body conveyance line and subjected to vehicle body rust prevention operations such as sealing application work, undercoat application work, and inner wax application work. A distinctive method of painting automobile bodies.