JPH03275172A - Repairing method for coating in molded article foamed at low pressure - Google Patents

Abstract

PURPOSE:To enhance the surface quality and workability of the title article by polishing the finish polishing part thereof while this finish polishing part is directly brought into contact with a cooling body and cooled in the case of cut-treating the coating defective part therof foamed at low pressure and, thereafter, performing finish polishing. CONSTITUTION:In the case of cut-treating a coating defect part 3 of a molded article 1 (e.g. ria spoiler) foamed at low pressure and, thereafter, performing finish polishing, while the finish polishing part 32 is directly brought into contact with a cooling body 6 (e.g. material packing cold water into a bag) and cooled, the part 32 is polished with a polisher 5. As a result, frictional heat is inhibited which is generated at a time for polishing the part 32 with the polisher 5. Therefore, the surface quality of the repaired part is made good and also workability is enhanced. Moreover finish polishing completion is rapidly judged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for repairing coating defects on a low-pressure foam molded product.

(Conventional technology) Conventionally, when a low-pressure foamed molded product has dust or scratches that cause paint defects, when attempting to repair it, the first step is to sand the area with sandpaper, and then apply finishing touches to the area. A method of polishing with a polisher tool is proposed.

(Problems to be Solved by the Invention) However, in the method described above, the following problems have arisen due to frictional heat generated when polishing the final polished portion with a polisher.

That is, a low-pressure foam molded product has many air bubbles inside it. Therefore, the air bubbles expand due to the frictional heat generated by the polisher and the painted surface is stretched, making it impossible to identify paint defects such as scratches, and even if it is determined that the final polishing is complete, the final polished area cools down. Then, the defective part of the paint may reappear, and there is a waste of time in having to wait for the final polishing part to cool down before deciding whether to finish the final polishing.

In addition, as mentioned above, low-pressure foam molded products have many air bubbles inside and are flexible, and the surface becomes soft when it receives heat from friction, so it is difficult to polish it with a polisher. , the final polished part becomes depressed and difficult to polish with a polisher, resulting in poor workability. Furthermore, the finished polished portion is deformed by the frictional heat, resulting in a decrease in surface quality.

As described above, it is practically difficult to finish polishing the surface by polishing with a polisher, and conventionally, if there was a coating defect, repainting was performed without repairing it.

The present invention has been made by focusing on the above-mentioned conventional problems, and makes it possible to repair defective coating parts of low-pressure foam molded products by making it practical to perform final polishing by polishing with a polisher. The purpose is to

(Means for Solving the Problems) In order to solve the above-mentioned problems, the painting repair method for a low-pressure foamed molded product of the present invention includes the following steps: The method is characterized in that the final polishing part is polished while cooling the final polishing part by direct contact with a cooling body.

(Function) If there are paint defects such as dust or scratches on the low-pressure foam molded product,
First, the part is ground with sandpaper or the like to make the surface quality of the part uniform.

Next, polish the area with a polisher to finish it off. During this final polishing, in the paint repair method of the present invention, a cooling body is brought into direct contact with the polished portion to appropriately cool it.

Therefore, the frictional heat generated in this final polishing area is suppressed, and various problems caused by this frictional heat, such as the inability to check the condition of the painted surface due to the tension on the painted surface due to the expansion of air bubbles, and the possibility that the surface is damaged due to heat. This can prevent softening that makes polishing difficult and surface deformation due to heat.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the embodiment will be explained. In order to explain the examples, we will take as an example the automobile glue sand boiler 1 made of low-pressure foamed urethane shown in FIG. Take protrusion 3 as an example.

FIG. 1 is a process diagram showing a method for painting and repairing a low-pressure foamed molded product according to an embodiment of the present invention. First, as shown in FIG. 1 (a),
A knife 4 is used to scrape off the dirt protrusion 3 that will be the repaired part. At this time, the dirt protrusion 3 is
Lightly apply coarse sandpaper to the area and scratch the surface. This is because the surface of the dirt protrusion 3 is smooth as it is, so when the knife 4 is applied, the knife 4 slides on the dirt protrusion 3, and the dirt protrusion 3 is dented by the flexibility of the low-pressure foamed urethane, causing the dirt protrusion 3 to dent. This is because the dust escapes from the knife 4. On the other hand, if the surface of the dust protrusion 3 is scratched with sandpaper, this scratch becomes a catch for the knife 4, and it becomes possible to scrape it off.

Also, at this time, as shown in FIG. 2, the blade of the knife 4 is held up at a substantially right angle and scraped from multiple directions, thereby concentrating the force of the knife 4 and making it possible to scrape off flatly.

Next, fine-grained (#2000) sandpaper is applied to the scraped portion 30 by the above-mentioned knife 4, and then the top is polished with a fine-grained polishing material (121, I). , as shown in Figure 1 (b),
By polishing including the periphery 31 of the scraped part 30,
The border between the scraped part 30 and the surrounding area 31 is made pocas-like.

Finally, as shown in FIG. 1(C), the polisher 5 performs final polishing, and at this time, the final polished portion 32 is cooled by the cooling body 6 to return the temperature to below room temperature. The final polished portion 32 is polished, and the surface condition of the final polished portion 32 is checked during cooling. As the cooling body 6, a bag filled with cold water or ice water is used, and this is brought into direct contact with the finished polished portion 32 to cool it.

As shown below, in this embodiment, first, the dust protrusion 3
Since the dirt protrusions 3 are scraped off with the knife 4, the working time can be significantly shortened compared to a method in which the dirt protrusions 3 are polished off with sandpaper from the beginning.

In addition, since the finish polishing part 32 is polished by the polisher 5 while being cooled by direct contact with the cooling body 6, the frictional heat generated when polishing by the polisher 5 is suppressed, and as described below. The harmful effects caused by this frictional heat can be prevented.

That is, since the finish polished portion 32 is not deformed by the frictional heat generated during polishing with the polisher 5, the surface quality can be improved.

Further, since the final polished portion 32 becomes hard by cooling, the final polished portion 32 is not dented during polishing with the polisher 5, and polishing with the polisher 5 becomes easier, improving workability.

In addition, since the painted surface does not stretch due to frictional heat, it is possible to polish with Polisher 5 while checking for the presence of paint defects such as dust and scratches, and this prevents paint defects from appearing after the work is completed. Therefore, it is possible to quickly determine whether the final polishing is finished when the surface of the polished part becomes similar to other parts.

Hereinafter, embodiments of the present invention have been described with reference to the drawings, but the specific configuration is not limited to the embodiments described above, and, for example,
If the paint defect is just a scratch, the step of scraping with a knife is not necessary.

(Effects of the Invention) As explained above, in the method for painting and repairing low-pressure foamed molded products of the present invention, the finish polished portion is polished with a polisher while being cooled with a cooling body. Frictional heat generated can be suppressed.

Therefore, the surface quality of the repaired portion is improved, workability is improved, and it is possible to quickly determine whether the final polishing is complete.

[Brief explanation of drawings]

FIGS. 1A, 1B, and 1C are process diagrams of a painting repair method according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the process of scraping with a knife. 1... Rear spoiler (low pressure foam molded product) 5... Polisher 6... Cooling body 32... Finish polished part

Claims (1)

[Claims] 1) After removing the paint defects on the low-pressure foam molded product,
A method for painting and repairing a low-pressure foam molded product, which comprises polishing the final polished part while cooling the final polished part by direct contact with a cooling body.