JP3185000B2 - Vinyl chloride powder slash method in the car body manufacturing process - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a vinyl chloride film on the outer surface of a body floor in a process of manufacturing a vehicle body such as a passenger car.

[0002]

2. Description of the Related Art Conventionally, in order to protect an outer panel surface of a body floor of a passenger car or the like, a vinyl chloride film is formed by a so-called vinyl chloride sol process in a vehicle body manufacturing process. FIG.
FIG. 5 shows the outline of this vinyl chloride sol process, and FIG.
As shown in (a), first, in the electrodeposition coating baking step, the body B is passed through the electrodeposition furnace 21 at a temperature of about 170 ° C. for about 30 minutes, and in the next vinyl chloride sol coating step (FIG. 5B). The cooled body B is sprayed with appropriate spray means 22.
With this, the vinyl chloride sol is sprayed and applied. In the middle overcoating baking step (FIG. 5C), the body B is passed through the furnace 23 at a temperature of about 140 ° C. for about 30 minutes,
As a result, the vinyl chloride film 24 is formed on the outer surface of the body floor by curing.

[0003]

However, especially in the vinyl chloride sol coating process, since the back side of the body floor has a complicated shape, automatic coating by a robot using spray means 22 or manual spray coating by an operator is performed. It must be dealt with in combination. In addition, since spray coating is used, there are problems such as not only scattering and dripping of the material, but also variation in the thickness of the formed vinyl chloride film 24 and waste of the material. Further, the organic solvent contained in the material may have a bad effect on fire and the human body.

Heretofore, a so-called vinyl chloride powder slush method has been known, and a schematic process thereof will be described with reference to FIG. In the mold heating step (see FIG. 6A), a predetermined mold 26 is heated in the hot blast stove 25. Next, the heated mold 26 is placed in the powder box 2.
7 (FIG. 6 (b)), and in the powdering step (FIG. 6 (c)), the mold 26 and the powder box 27.
Is rotated, whereby the material adheres to the mold 26. The adhered material is melted by the heat of the mold 26, and is subjected to a cooling / demolding step (FIG. 6D) to form a vinyl chloride molded article 28.
Is released from the mold 26.

According to such a vinyl chloride powder slush method, even if the shape is quite complicated, the material can be attached and melted, and the unmelted material is recovered, so that no material is wasted. Further, by using the powder box 27, there is an advantage that a material can be adhered only to a necessary portion, and further that the film thickness can be adjusted by controlling the material and process conditions. However, this vinyl chloride powder slush method is mainly applied to relatively small parts and the like, cannot be applied to an automobile body as it is, and such a technique has not been realized conventionally.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a vinyl chloride powder slush method which solves the problem of a method of forming a film using a vinyl chloride sol and is particularly suitable and effective for forming a film on a body floor or the like. .

[0007]

According to the vinyl chloride powder slash method in the vehicle body manufacturing process of the present invention, the body after completion of the electrodeposition coating process is maintained at a predetermined temperature, has a large number of air blow nozzles and is filled with a material. The body is placed at a predetermined position of the blow box, and air is blown out from the air blow nozzle to stir the material, and the stirring causes the material to adhere to the body floor, and the attached material is melted. Thus, a vinyl chloride film is formed on the back side of the body floor.

[0008]

According to the present invention, a blow box having a large number of air blow nozzles is used, and the material filled in the blow box is agitated by air blow and adhered to the body floor, so that a proper and good quality is obtained at a desired portion of the body. Can be formed. In this case, since a large body does not need to be rotated, it is possible to realize a film forming method suitable and effective for forming a film on a body floor of this kind without increasing the scale of equipment.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vinyl chloride powder slash method in a vehicle body manufacturing process according to the present invention will be described below with reference to FIGS. FIG. 1 shows schematic steps of the vinyl chloride powder slush method of the present invention. This method is performed by an electrodeposition coating baking step, a powdering step, and a middle top coating baking step shown in FIGS. 1 (a), 1 (b) and 1 (c), respectively. Of the above steps, the electrodeposition coating baking step and the intermediate top coating baking step are performed substantially in the same manner as in the conventional example. That is, the electrodeposition coating baking process (FIG. 1A)
Then, the body B is heated in the electrodeposition furnace 1 at a temperature of about 170 ° C. for 30 minutes.
For about a minute, and a baking process
In (c)), the body B is passed through the furnace 1 ′ at a temperature of about 140 ° C. for about 30 minutes.

FIG. 2 shows the powdering process (FIG. 1).
(B)) is shown in more detail. First, the body B is placed at a predetermined position of the blow box 2 (FIG. 2).
(A)). At this time, the body B is heated to a constant temperature. In this case, as shown in FIG. 3, after the electrodeposition step in the electrodeposition furnace 1, the body B is suspended by the hanger 3 and moved to a position above the blow box 2 along the transfer rail 4. The blow box 2 is lifted by the lifter 5, whereby the body B is placed at a predetermined position on the blow box 2. The blow box 2 'or 2 "is used depending on the type of vehicle (sedan vehicle or coupe vehicle).
Can be set at the position of the lifter 5.

Here, the blow box 2 has a substantially box shape as shown in FIG. 4, and the upper part thereof is formed so as to match with the film forming portion of the body B. Also,
At the top of the blow box 2, a seal 7 made of highly heat-resistant silicon rubber or the like is laid as shown in the figure, while the bottom of the blow box 2 is formed of a cloth material 8 having high air permeability. Further, a number of air blow nozzles 9 are provided on the lower surface of the blow box 2, and air is blown from the air blow nozzles 9 into the blow box 2. The side 2a of the blow box 2
Is formed of an aluminum material or the like.

Although the material 10 is filled in the blow box 2, as shown in FIG. 2 (b), by blowing air from an air blow nozzle 9, the material 1 is filled.
0 is stirred in the blow box 2. As a result, the material 10 adheres to the film formation site on the back side of the body floor. As the material 10, for example, a vinyl chloride powder slush material that can be attached and melted in a paint baking process in a vehicle body manufacturing process is preferable. Here, an example of the material composition of the material 10 is shown in the following table. In the table, examples of the material composition of the conventional vinyl chloride sol material in the back floor are also described.

[0013]

[Table 1]

Thus, the material 10 attached to the body B is melted to form a vinyl chloride film 11 on the back side of the body floor as shown in FIG. 2 (c). In this way, a proper and good quality vinyl chloride film 11 can be formed on a desired portion of the body B. However, the scattering, dripping of the material and the material occurring in the case of the spray coating in the conventional vinyl chloride sol coating process are performed. No waste problem arises. Further, since the air blow by the air blow nozzle 9 is performed as described above, the step of rotating the large body B can be eliminated. Therefore, the present invention can be effectively and suitably applied to this type of film formation without increasing the scale of equipment.

[0015]

As described above, according to the present invention, an appropriate vinyl chloride film can be formed on a desired portion of a body, and material waste and a bad effect on a human body can be prevented.
The problem of the conventional film forming method using vinyl chloride sol can be solved. In addition, there is an advantage that the equipment does not need to be increased in scale and an efficient vinyl chloride powder slush method can be realized.

[Brief description of the drawings]

FIG. 1 is a view showing schematic steps of a vinyl chloride powder slush method of the present invention.

FIG. 2 is a view showing a powdering step according to the vinyl chloride powder slush method of the present invention.

FIG. 3 is a schematic perspective view of equipment used for a vinyl chloride powder slush method of the present invention.

FIG. 4 is a schematic perspective view of a blow box used in the vinyl chloride powder slush method of the present invention.

FIG. 5 is a view showing a vinyl chloride sol process in a conventional vehicle body manufacturing process.

FIG. 6 is a view showing schematic steps of a conventional vinyl chloride powder slush method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrodeposition furnace 2 Blow box 3 Hanger 4 Transfer rail 5 Lifter 6 Conveyor 7 Seal 8 Cloth material 9 Air blow nozzle 10 Material 11 Vinyl chloride film B Body

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B29C 41/00-41/52 B05D 1/00-7/26

Claims (1)

(57) [Claims] 1. After the electrodeposition coating step, the body is maintained at a predetermined temperature, the body is placed at a predetermined position of a blow box having a number of air blow nozzles and filled with a material, and the body is placed at a predetermined position. Air is blown out to agitate the material, the material is adhered to the body floor by the agitation, and the adhered material is melted to form a vinyl chloride film on the back side of the body floor. PVC powder slash method in the body manufacturing process.