JPH0256281A - Method of applying chipping resistant paint to automobile - Google Patents

Abstract

PURPOSE:To match the lightness of the final finish coating color and chipping resistant paints by mixing proper ratios each of two kinds of the chipping resistant paints which are largely different in lightness according to the final finish coating color of a vehicle body and applying the mixture composed thereof to the vehicle body. CONSTITUTION:A scanner 13 automatically reads the finish coating color information of a bar code card 1 and inputs the information into a control panel 14 when the vehicle body B is transported to a painting stage. Then, the control panel 14 selects the mixing ratio meeting the lightness of the finish painting color information from the preset mixing ratios and outputs the ratio as a command signal to supply rate control pumps 11, 12. The chipping resistant paints of the assigned proportions are supplied to a mixing valve 6 side and are passed through the mixing valve 6 and a static mixer 7, by which the paints are sufficiently mixed to the assigned lightness; thereafter, the paint mixture is sprayed from a spray gun 8 to the vehicle body B.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for applying a chipping-resistant paint to prevent chipping on a part of an automobile body prior to topcoating.

Conventional technology The part of the outer surface of the car body below the bumper is
As shown in Figure 2, chipping-resistant paint is applied to alleviate the unpleasant noise and paint film damage caused by stone splashes (the chipping-resistant paint film is indicated by the symbol F).
.

When applying this chipping-resistant paint, regardless of the difference in the color of the second coat, for example, apply a single color (often dark gray) of the chipping-resistant paint uniformly over the electrodeposited film before applying the intermediate coat. The method used is to dry the paint, then apply an intermediate coat and a top coat to hide the chipping-resistant paint film.

In FIG. 2, 31 is a tank for chipping-resistant paint, 32 is a paint supply pump, 33 is a regulator, 34 is a spray gun, and 1 is a vehicle body as an object to be coated.

However, if the same color chipping-resistant paint is applied to all the top coat colors as described above, if chipping actually occurs, some top coat colors will be completely different from the top coat color. The chipping-resistant paint film of different colors is exposed, significantly reducing the appearance quality of the car body.

For example, as shown in Figure 3, when both the intermediate coat F and the top coat FT are damaged by chipping, the top coat FT is white and the chipping-resistant coat FC is close to black. If so, the color of the chipping-resistant coating FC becomes noticeable and the quality of the appearance deteriorates significantly even if no rust occurs. Fu is the undercoat electrodeposition coating, Sx is the side sill, D
is the door outer panel.

The present invention was made in view of the above-mentioned problems, and its purpose is to solve the three elements of color (brightness).

To provide a coating method that focuses on lightness, which is one of the chroma (1 hue), and can match the lightness of the final top coat color of a vehicle body with the lightness of a chipping-resistant paint.

Means for Solving the Problems In the painting method of the present invention, two types of chipping-resistant paints with significantly different lightness are prepared when spray-painting a chipping-resistant paint to prevent chipping on a part of the car body prior to topcoating. However, it is characterized in that these two types of chipping-resistant paints are mixed in appropriate amounts according to the final topcoat color of the vehicle body so as to match the lightness of the final topcoat color, and then painted.

More specifically, since there are generally dozens of colors for top coats on car bodies, these top coat colors are divided into several groups according to their lightness, and the chipping-resistant paint is In order to match the brightness, the mixing ratio of the two types of chipping-resistant paints should be mixed in advance for each group.

Then, depending on the top coat color of the car body, the optimal mixture ratio is selected from among the preset mixture ratios, and based on that mixture ratio, the two types of chipping-resistant paints with different brightnesses mentioned above are mixed. Paint.

Effect: According to this method, the lightness of the top coat color and the lightness of the chipping-resistant paint always match.

Embodiment FIG. 1 is an explanatory diagram of the configuration of a painting system to which the method of the present invention is applied. A car body B, which is an object to be painted, is conveyed to a painting stage by a conveyor not shown, and the car body B is Vehicle model information including topcoat color information is provided in advance in the form of a barcode card 1.

2.3 is a paint tank that is unitized with supply pumps 4, 5 and pressure-feeding piping, etc.;
A chipping-resistant paint having a high brightness, such as a white color, is stored in the tank 3, and a chipping-resistant paint having a low brightness, such as a black color, is stored in the other paint tank 3.

6 is a mixing valve, 7 is a static mixer, 8 is a
is a spray gun, and the chipping-resistant paint in each paint tank 2.3 is sent out by regulators 9, 10 and supply amount control pumps (gear pumps) 11 and 12, and
The mixture is thoroughly mixed by passing through the mixing valve 6 and the static mixer 7.

Reference numeral 13 indicates a scanner for reading the topcoat color information specified by the barcode card 1 attached to the vehicle body B. Reference numeral 14 indicates a control panel into which the topcoat color information read by the scanner is manually input. Command signal ■. The supply 1 control pumps 11, 12 are driven by the supply amount control pumps 11.1.
2 supplies the amount of chipping-resistant paint set by the control panel 14 to the mixing valve 6 side, as will be described later. Note that thinner as a solvent is simultaneously supplied to the mixing valve 6.

Here, as mentioned above, there are dozens of top coat colors for the car body, so as shown in Table 1, these top coat colors are divided into five groups within the range of N=1 to N=10 depending on the lightness. On the other hand, in order to match the brightness of the chipping-resistant paint with the brightness of the top coat color of each group, the mixing ratio of the two types of chipping-resistant paints should be mixed for each group. is set in advance.

For example, for a group of top coat colors whose brightness is N=5, the mixing ratio of the chipping-resistant paint with high brightness and the chipping-resistant paint with low brightness is set to 75=25.

Table 2 Therefore, in FIG. 1, when the vehicle body B is transported to the painting stage, the scanner 13 scans the barcode card 1.
The topcoat color information is automatically read, and the topcoat color information is input into the control panel 14.

When the top coat color information of vehicle body B is input to the control panel 14,
The control panel 14 selects a mixture ratio that matches the brightness of the topcoat color information from the preset mixture ratios in Table 1, and outputs it as a command signal to the supply amount control pumps 11 and 12. Each supply amount control pump 11, 12 supplies a specified amount of anti-chip paint to the mixing valve 6.
feed on the side. The two types of anti-chip paint supplied from each supply rate control pump 11 and 12 are mixed at the mixing valve 6.
The mixture is thoroughly mixed by passing through a static mixer 7, and after reaching a specified brightness, it is sprayed onto the vehicle body B from a spray gun 8. The coated film of the sprayed chipping-resistant paint is designated by the symbol FC.

As described above, before applying the top coat, a chipping-resistant paint with a brightness that matches the top coat color is applied.

Note that the overcoat color information may be input directly to the control panel r4 by the operator.

Effects of the Invention As described above, according to the present invention, appropriate amounts of two types of chipping-resistant paints that differ greatly in lightness are mixed in accordance with the top coat color of the car body, and the brightness of the chipping-resistant paint that is actually applied to the car body is adjusted. By adjusting the brightness to match the brightness of the topcoat color, even if the topcoat peels off and the chipping-resistant paint is exposed when the car body is chipped, the brightness of the chipping-resistant paint will match the topcoat color. Since it is consistent with this, it is not very noticeable and the exterior quality of the car body does not deteriorate.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a coating system to which the method of the present invention is applied, FIG. 2 is an explanatory diagram of the configuration of a conventional coating system, and FIG. 3 is an explanatory cross-sectional diagram taken along the ITJ-111 line in FIG. 2. 2.3...Paint tank, 6...Mixing valve, 7
... Static mixer, 8... Spray gun,
11.12... Supply amount control pump, 14... Control panel, B... Car body, FC... Chipping resistant paint coating.

Claims (1)

[Claims] (1) In a method of spray-painting a part of a car body with a chipping-resistant paint to prevent chipping before applying the topcoat, two types of chipping-resistant paint with greatly different brightness are applied depending on the final topcoat color of the car body. A method for applying chipping-resistant paint for automobiles, which is characterized in that the paint is mixed in an appropriate amount so as to match the brightness of the final topcoat color and then applied.