JPS6325823B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a multicolor painting method for automobiles.

[Prior Art] Multi-color painting such as two-tone painting is used for painting automobile bodies.

Taking conventional multicolor painting as an example of two-tone painting, it is generally performed by the following steps.

Electrodeposition coating → Electrodeposition coating film baking → Primer coating → Primer coating film baking → 1st color coating → 1st
Color paint film baking → masking → second color painting → second color paint film baking [Problems to be solved by the invention] As mentioned above, conventional two-tone painting involves a large number of steps, and a dedicated painting booth and baking oven are required for each. Three pieces are required.

In view of the above points, it is an object of the present invention to provide a multicolor coating method that can reduce the number of steps and the number of dedicated coating booths and baking ovens.

[Means for Solving the Problems] That is, in the present invention, when applying primer coating and multi-color coating to an automobile body that has been subjected to a base coating, after coating the side of the body with a primer using a hand gun, an automatic coating machine In the same painting booth located on the top and side, while applying the first color paint mist prevention primer to the top surface of the body using the top gun, the first color paint was applied to the lower side of the body using the side gun. A multi-color painting method for an automobile, characterized in that the first color paint is then applied to a window frame area on the side of the body using a hand gun, the primer paint and the first color paint are baked, and then the second color paint is applied. I will provide a.

[Embodiment] The multicolor coating method of the present invention will be explained by taking two-tone coating as an example.

According to the present invention, two-tone painting can be performed by the following steps.

Electrodeposition coating → Electrodeposition coating film baking → Primer coating + 1st color coating → Simultaneous baking of primer coating film and 1st color coating → Masking → 2nd color coating → 2nd color coating
Color coating baking In other words, in the present invention, the first color coating is applied wet-on-wet while the primer coating is applied in the same coating booth during the process, thereby reducing the need for a dedicated coating booth by one compared to the conventional method. Moreover, since the primer coating film and the first color coating film are baked at the same time, one baking process and one baking oven can be saved.

Next, this embodiment will be explained based on the drawings.

FIG. 1 shows an example of the pattern of first color coating and second color coating in the embodiment. The shaded area 1 is the area to which the first color painting is applied, and the non-shaded area 2 is the area to which the second color painting is applied. For example, the first color painting is part 1 of the window frame.
a and the lower part 1b of the side.

First, apply a primer to the side of the car body using a handgun. Next, as shown in Figure 2, with automatic coating machines placed on the top and sides, use the top gun 3 to apply a primer to prevent mist of the first color paint on the top surfaces of the body, including the roof and hood, while using the side gun. Step 4: Apply the first color paint to the lower part 1b of the side. Next, apply the first color paint to the window frame area on the side of the body using a handgun.
By performing the primer coating and the first color coating partially at the same time in this manner, the coating time can be shortened. Moreover, when applying the primer and the first color paint at the same time, by applying the primer for preventing mist of the first color paint to the top surface of the body as described above, the first color paint can be applied directly onto the electrodeposited film of the base coat. Prevent paint mist as much as possible (if the first color paint mist is applied to the cured electrodeposited coating, the surface will become rough, which may interfere with polishing after the first color paint is baked). Moreover, by applying the first color paint to the lower side of the body away from the top surface of the body, the mist of the first color paint is prevented from adhering to the primer as much as possible.
Even if there is a slight mist of the first color paint on the primer, since the primer is wet, it will not become rough and can be tolerated), preventing problems such as deterioration of the finish quality of the paint.

As described above, the two-tone coating is completed by applying primer coating and first color coating, baking, then masking, applying second color coating, and baking.

Although the present invention has been described above using two-tone painting as an example, the present invention is not limited to this example, and can also be applied to multi-color painting of three or more colors.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a coating pattern when two-tone coating is performed by the method of the present invention, and FIG. It is a schematic diagram showing an example of a painting method. (Main symbols in the drawing), 1: First color painted part,
2: Second color painting part, 3, 4: Painting gun.

Claims (1)

[Claims] 1. When applying primer painting or multi-color painting to a car body that has been painted with a base coat, after applying the primer to the side of the body with a hand gun,
In the same painting booth, automatic paint machines are installed on the top and side, and a top gun is used to paint the first coat on the top of the body.
While applying a primer to prevent mist of colored paint, apply the first color paint to the lower side of the body using a side gun, then apply the first color paint to the window frame area on the side of the body using a hand gun, and then A multicolor painting method for an automobile, characterized in that a second color coating is applied after the primer coating and the first color coating are baked.