JPS63107782A - Automobile assembling method - Google Patents

Abstract

PURPOSE:To prevent generation of a coat resembling a pitted skin by separating external plate parts from vehicle structural members, applying an intermediate coat and a finishing coat to each external plate part set in a horizontal state and assembling these parts into the structural members painted separately. CONSTITUTION:A front fender 2, a rear fender 3, a roof panel 4, each door 5, 6, a hood 7 and a trunk lid 8 are separated from a cab main which is a structural member already primed of a vehicle body. Each separated external plate part is set in a horizontal condition and installed on a receiving jig 10 of a conveyor 9. After this it is caused to pass through a coating machine 11 to receive an intermediate coat. After this intermediate coating, a finishing coat is applied under the same facility configuration. In addition, intermediate and finishing coats are applied to the cab main along with the painting of external plate parts. Each external plate part already coated are assembled with bolts.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of assembling an automobile, and more particularly to a method of assembling an automobile including intermediate coating and top coating.

Conventional technologyIn the manufacturing process of automobiles, in addition to exterior parts such as front fenders, rear fenders, and roof panels, opening/closing bodies such as doors, hoods, and trunk lids are assembled and attached to the vehicle body, and then an undercoat is applied, followed by an intermediate coat. It is common to apply a top coat and a top coat (for example, "Complete Book of Automotive Engineering Vol. 19: Automobile Manufacturing Method" (April 2, 1972
0), Sankaido, Pi 83). Each panel as described above is assembled to the vehicle body frame member in advance by welding, bolts, or the like.

Problems to be Solved by the Invention In the method of manufacturing a car as described above, the so-called outer panel parts of the side parts of the car body, such as the front fender, rear fender, and doors, are assembled in advance to the car body frame member in a nearly vertical state. It will be painted in that position. The regulations, especially the front fender and rear fender.

Regarding the undried paint film after the inner coating on the door) and the undried paint film after the top coat, there is a difference between the force trying to slide down in the vertical direction due to gravity and the force trying to stay in the original position, and the balance between the two forces must be maintained. As a result, the paint film becomes orange-skinned and the quality of the paint appearance deteriorates.

problem! The present invention solves the above-mentioned paint defects! In order to solve this problem, it is recommended to paint the outer panel parts on the sides of the vehicle body, such as the front fender, rear fender, and doors, in a horizontal position.

Specifically, as shown in the examples, the outer panel parts of the automobile body are separated from the vehicle body frame members, and the outer panel surfaces of these individual outer panel components are kept in a substantially horizontal state, and intermediate coating and top coating 1 are applied. On the other hand, the intermediate coating (I) and top coating of the vehicle body frame members are separately applied, and after the intermediate coating and top coating of each component, each outer panel component is assembled to the vehicle body frame member.

The outer panel part referred to here is the front fender.

In addition to rear fenders and doors, this includes roof panels, hoods, trunk lids, etc.

Embodiment Figures 1 to 81 and 3 are examples of the present invention! As shown in FIG. 3, for example, undercoating! Finished y't knee The rear fender 3 and roof panel 41 are separated, and the front door 5. The rear door 6, hood 7, and trunk/IJ rad opening/closing bodies are also separated from the cab mains in the same way.

Then, the outer panel parts separated from the cab main 1, that is, the front fender 2. Rear fender 3° Roof panel 4 Stupid front door 5. 6. Set the rear door 7 and the trunk lid 8 horizontally on the jig 10 of the conveyor 9 as shown in Figures 1 and 8, and pass them through the coating machine 11''l'. First, perform intermediate coating 1. 12 Has spray device, 13 spray device 1
This is an elevating mechanism that raises and lowers 2.

After the intermediate coating, seven top coats are applied, for example, under the same equipment configuration as in FIGS. 1 and 2.

Further, for the cab main 1, an intermediate coat and a top coat are separately applied in parallel with the above-mentioned painting of the outer panel parts.

The painted outer panel parts are then assembled to the cab main 1 by fastening means such as bolts.

Figure 4 shows the experimental results of the relationship between the object to be painted and the finished surface of the paint from the time of spraying the paint until the baking of the paint film is completed. The sharpness value is taken, and the horizontal axis shows the orientation of the object to be painted, ranging from 0° (horizontal) to 90' (vertical) to 18o0 (reverse horizontal). The value (PGD value) measured by a PGD meter manufactured by the research institute is used.

As is clear from FIG. 4, there is a very high correlation between the finished surface of the coating and the posture of the object to be coated, and it can be seen that painting in a horizontal posture is most advantageous. This is because the closer the posture of the object to be painted is to the vertical position, the more the force of the paint film trying to slide down in the vertical direction due to gravity and the force of trying to stay in its original position are balanced. Paint film! It is the mastery of forming.

Therefore, by painting each of the outer panel parts in a horizontal position as described above, it is possible to apply the paint to the front fender 2. Rear fender 3. Front door5. The painted surface of the rear door 6 can be significantly improved.

Effects of the Invention According to the present invention, an outer panel part is separated from a vehicle body frame member,
Because each outer panel part is placed in a horizontal position and painted with intermediate and top coats before being assembled to the car body frame, there is no peeling on the paint film, especially on fenders that are installed vertically to the car body frame. The painted surface of the door! can be significantly improved.

In addition, compared to painting each exterior panel part after it has been assembled into the vehicle body frame, there is no need to make complicated movements in the spray device of the paint sprayer, and a paint sprayer with a relatively simple structure is sufficient. .

[Brief explanation of the drawing]

@1 Figure is an explanatory diagram of a painted state showing an embodiment of the present invention, l
! 2. Figure 3 is a cross-sectional view taken along line A-A in Figure 1, Figure 3 is a perspective view of each outer panel part in a separated state, and Figure 4 is a characteristic diagram showing the relationship between coating quality and coating posture. ...Cab main as a vehicle body frame member, 2...
Front fender, 3...Rear fender, 4...Roof panel, 5...Front door, 6.°・Rear door, 7...Hood, 8...Trunk lid% 10.
...Receiving jig, 12 spray equipment. 2 people outside

Claims (1)

[Claims] (1) Separate the outer panel parts of the car body from the car body frame members,
These individual exterior parts are painted with intermediate and top coats with their exterior surfaces in a nearly horizontal state, while intermediate and top coats are applied separately to the vehicle body frame members. An automobile assembly method characterized by assembling each outer panel part to a frame member.