JP2516269B2 - Seam plate rust prevention structure and rust prevention method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seam plate rust preventive structure and a rust preventive method for a car body plate member in which rust does not occur at the seam plate member.

2. Description of the Related Art In some cases, a vehicle body plate material is overlaid and joined by spot welding or the like to a portion of the vehicle body of an automobile which can be seen from the outside. In this way, for example, a thermosetting sealing agent is applied to the overlapping parts of the vehicle body plate materials so that rust does not occur at the joint parts, and then a brush is applied to secure the initial appearance. , There may be a case where correction work is performed with a spatula or the like.
52-89460).

In addition, after the seam of the vehicle body plate material is soldered, finishing may be performed by polishing.
(Japanese Patent Laid-Open No. 53-11575).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the former rust preventive treatment means for applying a thermosetting sealing agent to the seam of a vehicle body plate material, those skilled in the finishing work with a brush, a spatula, etc. performed after applying the sealing agent are skilled in It will be necessary.

That is, if the sealing material is removed too much during the correction work with a brush or a spatula, the edge of the body plate material that is overlaid on the upper side is exposed and rust prevention is not sufficiently performed, while if the sealing agent is left too much, the flatness becomes flat. Since it is damaged, the finishing work tends to vary, and in order to eliminate the variation, it is necessary to rely on the intuition of the operator.

On the other hand, in the latter rust preventive means that finishes by polishing after solder welding, there is no problem in terms of appearance quality or rust preventive hardening, but there is a problem that the number of working steps increases and the cost increases.

Therefore, the present invention does not require post-processing for finishing, has good appearance quality, and is highly reliable in terms of rust prevention. Is provided.

Means for Solving the Problems In order to achieve the above object, the seam anticorrosion structure for a vehicle body plate material according to claim 1, wherein the first layer is provided at a position covering the seam of the underbody coated vehicle body plate material. Is a thin hot-melt film having good followability to a curved surface and adhesion to a coating material, and a second layer is an uncured thermosetting adhesive resin, and the tape is pre-baked. The coating film for body painting is continuously applied to the upper surface of the layer with other portions.

Further, the seam rustproof structure of the vehicle body plate material according to claim 2,
At the position that covers the seam of the body plate material that has been applied with the undercoat,
A tape is used, in which the first layer is a thin film hot-melt film having good followability to a curved surface and good adhesion to a coating material, and the second layer is an uncured thermosetting adhesive resin. A coating film for painting a vehicle body is continuously applied to the upper surface of one layer together with other portions.

According to a third aspect of the present invention, the first layer is a thin hot-melt film having good followability to a curved surface and good adhesion to a paint, and the second layer is not applied to the joint portion of the vehicle body plate material to which the undercoat coating is applied. This is a rust preventive method in which a tape made of a thermosetting adhesive resin for curing is applied, the tape is baked, and then the tape is also coated at the time of painting the vehicle body to form a coating film.

In a fourth aspect of the present invention, the first layer is a thin film urethane film having good followability with respect to a curved surface and good adhesion to a paint, and the second layer is uncured at a joint portion of a vehicle body plate material to which an undercoat coating is applied. This is a rust-prevention method in which a tape made of the thermosetting adhesive resin is attached, and then the tape is also applied at the time of painting the vehicle body to form a coating film.

According to the inventions of claims 1 and 3, the tape is provided along the shape of the vehicle body at the seam portion of the vehicle body plate so that the second layer of the tape adheres to the surface of the undercoat. The eye area is sealed. Then, by subjecting the tape to a baking treatment, the hot melt film of the first layer is melted and then cured at room temperature, so that the upper surface of the first layer becomes smooth. Then, the coating film for painting the vehicle body is formed over the entire surface including the tape so as to be in close contact with the upper surface of the first layer, and the overall appearance quality is secured.

Further, in the invention according to claims 2 and 4, the tape is provided along the shape of the vehicle body at the seam portion of the vehicle body plate so that the second layer adheres to the surface of the undercoat. Is sealed. Then, the coating film for painting the vehicle body is formed over the entire surface including the tape so as to be in close contact with the upper surface of the first layer, and the overall appearance quality is secured.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a steel plate as a vehicle body plate, and a steel plate 2 is superposed on the steel plate 1 from above and joined by spot welding.

ED coating film (electrodeposition coating film) on the upper surface of these steel plates 1 and 2
3 is formed as an undercoat paint film, and a steel plate 1,
A tape 4 is provided at a position that covers the second seam.

As shown in FIG. 3, the tape 4 has a base material 4a as a first layer and an adhesive 4b applied to the base material 4a as a second layer.
Before being installed, it is wound with the separator 7 in between.

The base material 4a has good followability to the irregularities and curved surfaces of the ED coating film 3 which is the coating surface, and has good adhesion of the coating material.
It consists of a thin nylon 12 hot melt film with a thickness of about μm.

The pressure-sensitive adhesive 4b is made of an uncured epoxy thermosetting pressure-sensitive adhesive resin, and is applied to the base material 4a in a thin film shape with a thickness of about 30 to 100 μm. The adhesive 4b is made of polyester,
Urethane-based or acrylic-based uncured thermosetting adhesive resin may be used, and the one that improves the adhesion between the substrate 4a and the ED coating film 3 is selected.

On the ED coating film 3 to which the tape 4 is pasted, an intermediate coating film 5 as a coating film is formed over the entire surface including the upper surface of the tape 4, and the upper surface of the intermediate coating film 5 is overcoated. The coating film 6 is formed.

In such an anticorrosion structure, the seams of the steel plates 1 and 2 are reliably sealed so that antirust is ensured. Further, since the base material 4a of the tape 4 is excellent in conformability to a curved surface and the tape 4 is very thin and conforms well to the coated surface, there is little unevenness in the joint after the top coating, The appearance quality is very good.

In addition to the structure in which the steel plate 1 and the steel plate 2 are superposed on each other, the steel plate 2 is superposed on the stepped portion 11 formed on the steel plate 1 as shown in FIG. It is also possible to use a flat top surface. In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

Next, the rustproofing method for the steel plates 1 and 2 will be described with reference to FIGS. 4 and 5. Here, the steel plates 1 and 2 are sill outer panels.

First, as shown in FIG. 4, the tape 4 is attached to the seam portions of the ED-coated steel plates 1 and 2 in the same manner as a general adhesive tape. Here, the tape 4 is used because a desired thinness can be obtained so that the joints are not conspicuous, and the tape 4 is soft and has a good followability to the steel plates 1 and 2, and the adhesiveness of the paint is high.

Next, the tape 4 is baked, and the hot melt film of the first layer is once melted and then cured at room temperature to make the upper surface of the tape 4 smoother and the adhesive 4b of the tape 4 once softened. After that, it will cure at normal temperature.

Next, as shown in FIG. 5, intermediate coating and top coating are performed, and the upper surface of the tape 4 as well as the upper surface of the ED coating film 3 of the steel plates 1 and 2 is subjected to vehicle body coating to form the intermediate coating film 5 and the top coating film 6. To form. That is, the coating film for vehicle body coating formed in close contact with the upper surface of the tape 4 is continuously formed over the upper surface of the ED coating film 3 of the steel plates 1 and 2. Then, the baking process after painting is performed, and the rustproofing process is completed.

As described above, in this embodiment, since the second layer of the tape is attached to the undercoat coated surface, not only the number of steps is small and the work is very simple, but also no post-processing for finishing is required. In addition, there is no variation due to the quality of post-processing, and skill is not required for the work. Also, since this tape seals the joint portion of the vehicle body plate material, it is highly reliable in terms of rust prevention. Further, the tape follows the shape of the vehicle body and the adhesion of the paint when painting the vehicle body is good, and the appearance quality is high.

Further, in the baking treatment, the hot melt film is once melted and then cured at room temperature, so that the tape surface becomes smoother, the conformability to the vehicle body plate material is improved, and the appearance quality is further improved.

In particular, the tape 4 is not only easy to handle and does not require skill like general adhesive tape, but it also has the adhesive 4b so that the tape 4 can be affixed with the panel to be rustproofed standing upright. There is also an effect that the work can be performed and the work becomes easy.

As the material of the base material 4a (first layer), an EVA (ethylene vinyl oxide) -based hot melt film which is another hot melt (thermoplastic) film having good conformability to a curved surface may be used.

Further, as the material of the base material 4a, it is also possible to use a urethane film which has no thermoplasticity but has good followability to a curved surface and good adhesion to a paint. When such a urethane film is used, the above-described tape baking process can be omitted. In this case, after the tape 4 is once softened during the baking process after coating, which is performed later,
It will cure at room temperature. Here, a urethane film having heat resistance that can sufficiently withstand the baking process is used.

EFFECTS OF THE INVENTION As described above, according to the invention described in claims 1 and 3, the hot melt having good followability to a curved surface and adhesion to a paint is used as the first layer, and the second layer having adhesiveness is used as the body plate material. Since it is affixed to the seam area to seal the seam area, the work is simple, and there is no need for post-processing for finishing, and it is highly reliable in terms of rust prevention. Then, by subjecting the tape to a baking treatment, the hot melt is melted and the tape surface becomes smoother, the conformability to the vehicle body plate material is improved, and the coating film adheres to the upper surface of the first layer of the tape to form another coating film. By being applied in succession with the part, a very high quality of its appearance is obtained.

According to the invention described in claims 2 and 4, a urethane film having good followability to a curved surface and adhesion to a paint is used as a first layer, and a second layer having adhesiveness is attached to a seam portion of a vehicle body plate material. Since this seam area is sealed, the work is easy, there is no need for post-processing for finishing, and the reliability is high in terms of rust prevention, and it adheres to the upper surface of the first layer of this tape. By continuously applying the coating film to other portions, it is possible to obtain a product having high appearance quality.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a seam portion of a plate material subjected to anticorrosion treatment, FIG. 2 is a cross-sectional view of another embodiment, FIG. 3 is a perspective view showing the structure of a tape, and FIGS. 4 and 5 are It is a perspective view which shows a rust prevention process. 1,2 ... Steel plate (body plate material), 3 ... ED coating film (undercoating), 4 ... Tape, 4a ... Substrate (first layer), 4b ... Adhesive (second layer), 5 …… Intermediate coating film (coating film).

Claims (4)

(57) [Claims] 1. A first layer is a thin film hot-melt film having good followability to a curved surface and good adhesion to a paint, and a second layer is uncured at a position covering a joint of a vehicle body plate material to which an undercoat coating is applied. A tape made of a thermosetting adhesive resin is provided, and a coating film for painting a vehicle body is continuously applied to the upper surface of the first layer of the tape which has been subjected to a baking treatment in a continuous manner. Anti-corrosion structure for seam plate material. 2. A first layer is a thin film urethane film having good followability to a curved surface and good adhesion to a paint at a position covering a joint of a vehicle body plate material to which an undercoat is applied.
A tape whose layer is an uncured thermosetting adhesive resin is provided, and a coating for car body painting is continuously applied to the upper surface of the first layer of the provided tape in a continuous manner with other parts. A rustproof structure for the seam of the car body plate. 3. A first layer is a thin hot-melt film having good followability to a curved surface and good adhesion to a paint, and a second layer is an uncured thermosetting film at a joint portion of an undercoat-coated vehicle body plate material. After attaching a tape made of a water-soluble adhesive resin, the tape is baked, and then a coating film is formed on the tape when painting the vehicle body to form a coating film. Method. 4. A first layer is a thin urethane film having good followability to a curved surface and good adhesion to a paint, and a second layer is an uncured thermosetting resin at a seam portion of a vehicle body plate coated with an undercoat. A method for preventing joint rusting of a vehicle body plate material, which comprises applying a tape made of an adhesive resin and then applying a coating on the tape at the time of painting the vehicle body to form a coating film.