JPS61245865A - Method for electrostatic painting of fuel filler lid made of resin - Google Patents

Abstract

PURPOSE:To reduce painting cost and to enhance quality, by applying conductive primer to the surface of the front end part of the fuel filler lid made of a resin hingedly connected to the main body of a metal car body and simultaneously applying electrostatic painting to both of them from said front end part toward the rear end part. CONSTITUTION:After the painting of an under coat was applied to a metal car body comprising a rear fender panel B, a fuel filler rid R made of a resin is mounted to said car body. In this state, a conductive resin W is applied to the range from the contact parts M, W at a hinge part to at least a part of the front end surface of the fuel filler lid R and an intermediate painting is performed in an electrostatic painting booth in such a state that at least a part of the front end part of the fuel filler lid R is earthed to the main body of the car body. At this time, if the main body of the car body is conveyed in the booth from the front end side of the fuel filler lid R, both of them can be simultaneously subjected to high quality electrostatic painting.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a resin car body in which a resin fuel filler lid can be electrostatically painted at the same time as the metal car body while the resin fuel filler lid is attached to the metal car body. Concerning an electrostatic coating method for parts.

(Prior Art) Automobile bodies are usually manufactured using metal panel materials, but in recent years, resin body parts have been incorporated into some of the automobile bodies.

FIG. 7 is a diagram showing a fuel filler lid R attached to a rear fender B constituting the automobile body shown in FIG. 6, for example as disclosed in Utility Model Application No. 58-35,422 A filler base G provided on the back surface of the rear fender B has a fuel tank cap C which is detachably attached to the tip of a filler tube (not shown) connected to the fuel tank.

In recent years, the fuel filler lid R for opening and closing the opening H formed in the filler base G has been molded from resin. And the rear fender
Painting of automobile bodies made of metal panel materials such as B is usually done by applying an undercoat by electrodeposition, and then
Intermediate and top coats are applied using electrostatic coating.

In electrostatic painting, the object to be coated, the automobile body, is used as an anode, and the paint spraying device is used as a cathode, and a high negative voltage is applied to it to create an electrostatic field between the two poles, and the sprayed paint particles are negatively charged.
This is a method of efficiently adsorbing paint to the object to be coated, which is the opposite polarity, and is widely used for painting automobile bodies, etc. due to its high coating efficiency. When painting an automobile body having a resin fuel filler lid R as described above by electrostatic painting, the resin fuel filler lid R is attached to the metal automobile body body, and these are electrostatically coated. When electrostatically painting at the same time in a paint booth, the resin fuel filler lid R receives more paint than the metal car body due to the difference in charge rate between the metal car body and the resin fuel filler lid R. The problem was that it was difficult to put on.

Therefore, conventionally the fuel filler lid R was made of resin.
and the metal car body body separately, and after each is painted, a resin fuel filler lid R is attached to the car body body, or if these are painted at the same time, the resin fuel filler lid R is painted. Regarding the lid R, an electrically conductive primer paint is applied to the resin product in advance and an undercoat is performed without performing an undercoat by electrodeposition.

(Problems to be Solved by the Invention) However, as mentioned above, if the vehicle body and the resin fuel filler lid R were painted separately,
Not only does this lead to an increase in painting costs, but even if paints of the same color are used, there will inevitably be differences in hue.
You can't get high quality products. Furthermore, even if the undercoating is done separately, there is not only the difficulty that the color and texture of the paint applied to the car body and the paint applied to the resin fuel filler lid R do not match. ,
There was a problem in that the painting cost increased.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to electrostatically coat a metal vehicle body and a resin fuel filler lid R at the same time, thereby achieving high-quality coating while reducing coating costs. The aim is to obtain a surface.

(Means for Solving the Problems) To achieve the above object, the present invention includes a resin fuel filler lid that is rotatably attached to a metal vehicle body at a hinge provided at the front end thereof, and A conductive primer that grounds the resin fuel filler lid to a metal vehicle body body is applied to the front end of the resin fuel filler lid so that at least a portion of the surface of the resin fuel filler lid is exposed;
This is an electrostatic coating method for a resin fuel filler lid, characterized in that the surface of the resin fuel filler lid is electrostatically coated from the front end to the rear end at the same time as the metal vehicle body.

(Function) By attaching a resin fuel filler lid to a metal vehicle body and applying a conductive primer to the front end of the fuel filler lid so that at least a portion of the surface of the front end of the fuel filler lid is exposed, Electrostatic coating is performed from the front end to the rear end of the resin fuel filler lid while at least a portion of the rear end of the resin fuel filler lid is grounded to the metal vehicle body. As a result, the electrostatic paint first adheres to the conductive primer applied to the surface of the fuel filler lid. Since the electrostatic paint in the wet state before drying contains a solvent and has low electrical resistance, the surface of the fuel filler lid where the electrostatic paint is to be applied is teeth,
The vehicle body is grounded in sequence, making it possible to perform high-quality electrostatic painting on the vehicle body and fuel filler lid at the same time.

(Example) Hereinafter, the electrostatic coating method for resin car body parts of the present invention will be described with reference to the drawings.

FIG. 2 is a diagram showing a state in which a fuel filler lid R made of resin is attached to an automobile body made of a gold film, which is made of a fender panel B, etc., after being undercoated.

Generally, an automobile body is formed by welding various metal panel materials such as a rear fender, body sides, and floor main through a floor main process, a main body first process, and a metal line process. The metal car body body thus formed is carried into the car body painting process shown in FIG. In this painting process, oil adhering to the car body is first completely removed in a degreasing process 1, and then a chemical conversion treatment is performed to form a chemically stable inorganic film on the surface of the steel plate. This chemical conversion treatment activates the surface of the steel sheet and imparts antirust properties, and further improves the adhesion of the coating film. After the pretreatment consisting of the above degreasing process and chemical conversion treatment process 1 is completed, an undercoat 2 is usually applied by electrodeposition coating.
The undercoat film surface is baked and cured in a drying oven 3. Next, in a step indicated by reference numeral 4, the undercoat film surface is wiped to remove unevenness in the coating), and dust etc. adhering to the vehicle body body B is wiped off (
dustproof wipes).

After the undercoating is completed in this way, the fuel filler lid R having the arm 20 is attached to the fender panel B of the vehicle body via the hinge box 21 in step 5. Install.

FIG. 3 is a view showing the front end of the fuel filler lid R, and a pin 22 that fits into a hinge box 21 is integrally formed at the tip of the arm 20. Also arm 2
A protrusion 24 that comes into contact with the hinge box 21 when the fuel filler lid R is closed is formed at the base of the fuel filler lid R.

A part of the hinge box 21 is shown in FIG. 4, and a flange portion 23 that is fastened to a filler base G fixed to the back surface of the flyer fender B is formed in the opening.

When the fuel filler lid R is attached to the rear fender B via the filler base G together with the hinge box 21 as a hinge part, and when the fuel filler lid R is closed, the arm 2 is attached as shown in FIG.
0 and the opening of the hinge box 21 contact at the contact portion M, and the protrusion 24 and the flange portion 23 contact at the contact portion N.
contact at.

From these contact parts M and N to the fuel filler lid R
A conductive primer, ie, a conductive resin W, is applied to at least a portion of the surface of the rear end as shown in FIG. Since the conductive primer is applied only to a limited area in this way, the amount of conductive primer used is significantly reduced. Incidentally, before attaching the fuel filler lid R to the vehicle body together with the hinge box 21, the conductive primer W may be applied to the above-mentioned range.

In this manner, the intermediate coating 7 is applied in the electrostatic coating booth with a part of the surface of the rear end of the resin fuel filler lid on the automobile body being grounded.

In this electrostatic painting process 7, the arm portion 2O and the hinge box 21 provided at the front end of the fuel filler lid R are located further forward of the vehicle body than the rear end of the fuel filler lid R. When the vehicle body is carried into the electrostatic coating booth from the front side, electrostatic paint is first deposited on the front end surface of the fuel filler lid R along with the vehicle body. That is, the electrostatic paint is primarily applied to the conductive primer W first.

This paint is sometimes in a wet state and has very low electrical resistance. Therefore, the electrostatic paint that adheres to the conductive primer W and the electrostatic paint that adheres to the surface of the fuel filler lid R cause the fuel to flow. The surface of the filler lid R is sequentially grounded to the vehicle body, making it possible to paint the entire surface of the fuel filler lid R.

After the intermediate coating film surface is formed by electrostatic coating in this way, as shown in FIG. Transported to the process. If electrostatic coating is to be performed in this top coating step in the same manner as in the intermediate coating step, electrostatic coating is carried out in the same manner as described above.

FIG. 5 is a diagram showing another structural example of the fuel filler lid R, and this fuel filler lid R is integrated with a steel hinge plate 30 and a filler base G on the vehicle body side. A hinge plate 31 made of iron plate and a hinge pin 3 that connects these hinge plates 30 and 31.
2 and can be attached. Hinge plate 3
A hinge plate 31 forming a hinge portion together with 0 is fixed to the filler base G with screws 33. Such a fuel filler lid R is also electrostatically coated by the same method as described above.

(Effects of the Invention) As described above, according to the present invention, the resin fuel filler lid is rotatably attached to the metal vehicle body at the hinge provided at the front end thereof, and the resin fuel filler lid is rotatably attached to the metal vehicle body. A conductive primer for grounding the resin fuel filler lid is applied to the front end of the resin fuel filler lid so that at least a part of the surface of the resin fuel filler lid is exposed; Since the electrostatic coating is applied from the top to the rear end at the same time as the metal car body, it is possible to electrostatically paint the resin fuel filler lid at the same time as the car body, and the amount of conductive primer used can be Coupled with the fact that it requires less
Not only can painting costs be significantly reduced, but since electrostatic painting is performed at the same time, the color and surface of the paint film formed on resin car body parts are uniform with the car body itself, resulting in high quality. The effect that a coating film surface can be formed is obtained.

[Brief explanation of drawings]

Fig. 1 is a process diagram showing a coating process according to an embodiment of the electrostatic coating method of the present invention, Fig. 2 is a sectional view showing a resin fuel filler lid attached to a vehicle body, and Fig. 3 is a process diagram showing a coating process according to an embodiment of the electrostatic coating method of the present invention. 2 is a perspective view showing the rear end of the fuel filler lid shown in FIG. 2, FIG. 4 is a perspective view showing a part of the hinge box shown in FIG. 2, and FIG. 5 is a fuel filler according to another embodiment of the present invention. FIG. 6 is a sectional view showing the lid, FIG. 6 is a perspective view showing the vehicle body, and FIG. 7 is an enlarged perspective view of section V11 in FIG. 6 with the fuel filler lid in an open state. B... Rear fender-1 R... Fuel filler lid, W... Conductive primer, 21... Hinge box, 30.31... Hinge plate.

Claims (1)

[Claims] A resin fuel filler lid is rotatably attached to a metal vehicle body at a hinge provided at its front end, and a conductive primer for grounding the resin fuel filler lid to the metal vehicle body is attached to at least the resin fuel filler lid. It is applied to the front end of the resin fuel filler lid so that a part of the surface of the resin fuel filler lid is exposed, and applied simultaneously to the metal vehicle main body from the front end of the resin fuel filler lid surface toward the rear end. An electrostatic coating method for a resin fuel filler lid, characterized in that electrostatic coating is performed.