JPS63130427A - Rust prevention method for sun roof housing - Google Patents

Abstract

PURPOSE:To eliminate a caulking putty burying work, by a method wherein a foaming sealer is situated to the flange part of a sun roof housing through a gap being large enough to allow passage of an electrodeposition solution, and through foaming of the foaming sealer after electrodeposition, the gap is sealed. CONSTITUTION:A foaming sealer 9 is coated on a peripheral flange part 6 of a sun roof housing 3, and with this state, and the flange part is mounted to a roof 7. A gap C being large enough to allow smooth flow of an electrodeposition solution is formed between the upper surface of the foaming sealer 9 and the under surface of the roof 7. After electrodeposition, in a baking and drying process, the foaming sealer 9 is foamed to seal the gap C, and sealing of a space between the under surface of the roof 7 and the flange part 6 is automatically effected. This constitution enables elimination of a work of burying the gap with caulking patty, which is heretofore effected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of rust-proofing a sunroof housing in an automobile equipped with a sunroof.

(Prior Art) The sunroof of an automobile is basically constructed as shown in FIG. A pair of left and right guide rails 2 for guiding the movable roof 1 in the front-rear direction are fixed to a sunroof housing 3, and the sunroof housing 3 is attached to a roof rail inner 5 via a bracket 4.

A gap between the flange portion 6 of the sunroof housing 3 and the lower surface of the roof 7 is sealed by the roof A.

Electrodeposition painting of the car body is done by replacing the sunroof housing 3 with the roof 7.
This is done with the device attached to the Moreover, conventionally the roof A
A mastic roof is used as a mastic roof, and the vehicle body is electro-deposited while the gap between the flange portion 6 and the lower surface of the roof 7 is sealed.

For this reason, the fluidity of the electrocoating liquid during electrocoating is poor at the corners of the movable roof storage space 8 formed between the roof 7 and the sunroof housing 3, and the areas shown with diagonal lines in FIG. There was a problem in that it became difficult to electrodeposit P, and no antirust effect could be expected in this portion P.

As a way to deal with this, as shown in FIG. It has been conventionally practiced to improve the fluidity of coating liquids.

(Problems to be Solved by the Invention) According to this method, the portion P can be properly electrodeposited, but it is necessary to seal the missing In portion B after the electrodeposition coating. For example, since it is necessary to embed caulking putty, there is a problem in that the number of man-hours increases and the cost increases.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a gap between the flange portion of the sunroof housing and the lower surface of the roof to allow smooth flow of the electrocoating liquid. After applying the foam roof to the desired thickness, the body of the car with the sunroof housing is electrodeposited, and in the next electrodeposition baking drying process, the foam roof is foamed to form a bond between the flange portion and the lower surface of the roof. It is characterized by sealing between.

(Function) According to the above configuration, electrodeposition coating is performed with a gap maintained between the upper surface of the foam roof applied on the flange portion of the sunroof housing and the lower surface of the roof, so that the electrodeposition is applied through the gap. The M coating liquid flows smoothly, and the fluidity of the electrodeposition coating liquid is improved even in the corners of the movable roof storage space, and the electrodeposition coating in the area indicated by P in Figure 5 is properly performed. .

In addition, in the subsequent electrodeposition baking drying process, the foamed roof can be automatically foamed using the heat of baking, and the volume increase of the foamed roof at that time completely seals the gap and closes the flange portion. and the underside of the roof.

(Example) An example of the present invention will be described based on FIGS. 1 to 4.

As shown in FIGS. 1 and 2, a foam roof 9 is provided on the peripheral flange portion 6 of the sunroof housing 3 to a predetermined thickness.
is applied, and the sunroof housing 3 is attached to the roof 7 in this state. When the sunroof housing 3 is attached, a gap C is formed between the upper surface of the foamed roof 9 and the lower surface of the roof 7 to allow smooth flow of the electrodeposition coating liquid.

The vehicle body with the sunroof housing 3 attached to the roof 7 as described above is electrocoated in an electrocoating process. At this time, the electrodeposition coating liquid flows inside and outside the movable roof storage space 8 through the gap C, and the fluidity of the electrodeposition coating liquid is improved even in the corners of the movable roof storage space 8, as shown in P in FIG. Electrodeposition coating of the parts shown is also done properly.

In the next electrodeposition baking drying process, the electrodeposition coating is baked at a temperature of about 180 to 200°C, and this heat can be used to foam the foam roof 9.

As a result, the volume of the foam roof 9 increases, and as shown in FIGS. 3 and 4, it is possible to completely seal the gap C and seal between the flange portion 6 and the lower surface of the roof 7. .

After that, the car body undergoes a special painting process such as chipping-resistant painting.
Painting is performed using an intermediate coating process, a top coating process, etc.

(Effects of the Invention) According to the present invention, proper electrodeposition coating can be applied to the entire area of the sunroof housing, ensuring a rust-preventing effect, and the foamed roof between the upper surface and the lower surface of the roof provided for this purpose. Gaps can be automatically sealed by foaming the foam roof using the heat from the electrodeposition baking drying process, eliminating the need for the conventional work of embedding caulking putty, reducing man-hours and reducing costs. This has the effect of being advantageous.

[Brief explanation of the drawing]

Figures 1 to 4 show embodiments of the present invention, with Figure 1 being a sectional view of the vehicle roof before electrodeposition coating, Figure 2 being a sectional view taken along line nn in Figure 1, and Figure 3 4 is a sectional view taken along the line TV-IV in FIG. 3. FIG. Fig. 6 shows the conventional example shown in Fig. 5 Vl-Vl.
FIG. 3 is a cross-sectional view of a portion corresponding to a line cross section.

Claims (1)

[Claims] (1) After applying a foam sealer on the flange of the sunroof housing to a thickness that creates a gap between it and the underside of the roof that allows for smooth flow of the electrocoating liquid, A method for anti-corrosion treatment of a sunroof housing portion, characterized in that the body of an automobile is electrodeposited, and in the next electrodeposition baking drying step, the foaming sealer is foamed to seal between the flange portion and the lower surface of the roof. .