JPH07205834A - Filling method of foaming substance - Google Patents

Abstract

PURPOSE:To provide a filling method of a foaming substance which can prevent the generation of rust inside closed cross section structure members. CONSTITUTION:A rust preventive is under-coated to a car body 10 which is made in a white body, and then, a foaming substance 26 is inserted in a closed cross section structure 24 from a foaming substance insertion hole 16 of a front pillar 12, and a foaming substance 26 is loaded to the loading part of a support plate 28. And a foaming substance 26 is inserted in a closed cross section structure 38 from a foaming substance insertion hole 18 of a center pillar 14, and the foaming substance 26 is inserted between the partition plates 44 in a closed cross section structure 42. Under such a condition, a second coating and a finish coating are applied to the car body 10, and the foaming substance 26 is foamed by the heating when the car body passes through the drying furnace of the second coating and the finish coating. Consequently, by the foaming substance in the closed cross section structures of the car body, a part where the rust preventive cannot be coated is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling a foam body by inserting and filling the foam body before foaming into a closed cross-section structure portion such as a rocker or pillar of an automobile body.

[0002]

2. Description of the Related Art Conventionally, an example of a method of filling a foam by inserting and filling the foam before foaming into a closed cross-section structure portion such as a rocker or a pillar of an automobile body is described in Japanese Utility Model Publication 6
It is disclosed in Japanese Patent Publication No. 3-203481.

As shown in FIG. 8, in this foam filling method, first, a low fluidity foaming resin is filled inside a closed cross-section structure portion such as a rocker 72 and a pillar 74 of a vehicle body 70,
The space inside the member is filled or partially filled with the foamed material that is foamed and cured.

[0004]

However, in this foam filling method, after the foam is filled, an undercoat is applied by applying a rust preventive agent. Therefore, the rust preventive agent is not applied to the foam-filled portion inside the closed cross-section structural member. For this reason, when water penetrates into the closed cross-section structural member, rust may be generated in a portion not coated with the rust preventive agent.

In view of the above facts, an object of the present invention is to provide a foam filling method capable of preventing the generation of rust inside a closed cross-section structural member.

[0006]

According to the method of filling a foam of the present invention, a press-molded part is welded and assembled on a vehicle body that is a white body to be undercoated, and then the foam body before foaming is formed in a closed cross-section structure portion of the vehicle body. Is inserted and filled, and then the foam is foamed by heating the intermediate coating and the top coating when passing through a drying furnace.

[0007]

According to the foam filling method of the present invention, a white body is coated with a rust preventive agent, that is, a so-called undercoat is formed.
After that, the foamed body before foaming is inserted and filled into the closed cross-section structure portion of the vehicle body, and then the foamed body is foamed by heating during passing through the drying furnace for intermediate coating and top coating. Therefore, there is no part in the closed cross-section structure of the vehicle body to which the anticorrosive agent cannot be applied due to the foam. Therefore, it is possible to prevent rust from being generated inside the closed cross-section structural member.

[0008]

FIG. 1 shows an embodiment of a method for filling a foam according to the present invention.
~ It demonstrates according to FIG.

In the figure, an arrow FR indicates a front direction of the vehicle body, an arrow UP indicates an upward direction of the vehicle body, and an arrow IN indicates an inward direction of the vehicle width direction.

As shown in FIG. 1, according to the foam filling method of this embodiment, the front pillar 12, the center pillar 14, etc., which form the skeleton of the vehicle body 10 by welding and assembling press-molded parts, are closed. Foam insertion holes 16 and 18 for inserting foam are formed in the cross-section structure.

As shown in FIG. 2, the front pillar 12 is
Is composed of a front pillar outer 20 which constitutes an outer side portion of the front pillar 12 in the vehicle width direction, and a front pillar inner 22 which constitutes an inner side portion of the front pillar 12 in the vehicle width direction. Structure 24
Is formed. In this closed cross-section structure portion 24, the foam 2
A support plate 28 for mounting the 6 is provided. The support plate 28 has an L-shaped cross section, one piece 28A is welded to the front pillar inner 22, and the foam 26 is mounted on the mounting portion 28B of the other piece.

The support plate 28 is the front pillar inner 22.
The foam 26 is located below the foam insertion hole 16, the foam 26 is inserted into the closed cross-section structure portion 24 from the foam insertion hole 16, and the foam 26 is mounted on the mounting portion 28B of the support plate 28. It is supposed to do.

The foam 26 is a bead-shaped foam particle 30.
Is placed in a bag 32 made of polyethylene or the like, which has a degree of freedom in its shape and can be easily inserted through the foam insertion hole 16.

As shown in FIG. 4, the center pillar 14
Is composed of a center outer 34 that constitutes an outer side portion of the center pillar 14 in the vehicle width direction, and a center pillar inner 36 that constitutes an inner side portion of the center pillar 14 in the vehicle width direction. The part 38 is formed. The lower end of the closed cross-section structure 38 has a rocker 4
The rocker 40 forms a closed cross-section structure portion 42 extending in the front-rear direction of the vehicle body.

As shown in FIG. 5, the partition plate 4 for determining the foaming position of the foam 26 in the closed cross-section structure 42.
A pair of 4 is provided. These partition plates 44 have a cross section L
Each piece 44A is shaped like a letter and extends in a direction away from each other, and is welded to the rocker inner 46 that constitutes the vehicle width direction inner side portion of the rocker 40. Further, the other pieces of the partition plate 44 are respectively defined as partition sections 44B, and the foam 26 is inserted between these partition sections 44B.

The pair of partition plates 44 are positioned so as to sandwich a portion below the foam insertion hole 18 (see FIG. 4) of the center pillar inner 36, and the foam 2 is inserted through the foam insertion hole 18.
When 6 is inserted into the closed cross-section structure 38, the foam 26 passes through the closed cross-section structure 38 and is inserted between the partition parts 44B of the partition plate 44 in the closed cross-section structure 42. .

Next, the operation of this embodiment will be described. In the foam filling method according to the present embodiment, the body 1 having a white body is used.
No. 0 is coated with a rust preventive agent as an undercoat. Thereafter, as shown in FIG. 2, the foam insert hole 1 of the front pillar inner 22 is inserted.
From 6, the foam 26 is inserted into the closed cross-section structure portion 24, and the foam 26 is mounted on the mounting portion 28B of the support plate 28.

Further, as shown in FIGS. 4 and 5, the foam 26 is inserted into the closed cross-section structure 38 from the foam insertion hole 18, and the foam 26 is separated by the partition plate 44 in the closed cross-section structure 42.
It is inserted between the partition parts 44B.

In this state, the vehicle body 10 is subjected to intermediate coating and top coating, and the foam 26 is foamed by heating the intermediate coating and top coating as they pass through the drying furnace. As a result, as shown in FIG. 3, the foam inserted into the closed cross-section structure 24 foams and hardens, and the foam 26 thus produced closes the closed cross-section structure 24 to provide a soundproofing effect. After foaming, tape 50
The foam insertion hole 16 is closed by.

Further, as shown in FIGS. 6 and 7, the foam inserted in the closed cross section structure 42 is foamed and cured, and the closed cross section structure 42 is closed by the generated foam 26 to obtain a soundproof effect. To be

As described above, in the foam filling method of this embodiment, the foam 26 is inserted into each closed cross-section structure portion after the rust preventive agent is applied to the vehicle body 10 having a white body by undercoating. There is no portion in the closed cross-section structure of the vehicle body where the rust preventive agent cannot be applied due to the foam 26. Therefore, it is possible to prevent the generation of rust inside the closed cross-section structural member.

Further, in the foam filling method of this embodiment,
Foam 2 by heating during the drying furnace for the middle coat and top coat
Since 6 is foamed, it is not necessary to provide special heating equipment for foaming the foam 26, and conventional production equipment can be used.

Further, in the foam filling method of this embodiment,
Since the foam 26 in which the bead-shaped foam particles 30 are put in the bag 32 made of polyethylene or the like is used, no special equipment is required as compared with the method of directly injecting the two-component urethane liquid or the like into the closed cross-section structure portion, and The workability is very good because there is no risk of contamination due to leakage of urethane liquid.

In the foam filling method of this embodiment,
The foam 26 in which the bead-shaped foam particles 30 are placed in the bag 32 made of polyethylene or the like is used, but the foam is not limited to this, and may be a sheet if it can be inserted from the foam insertion holes 16 and 18. The foam, the cylindrical foam or the like may be used. Further, according to the foam filling method of the present embodiment, the foam 26 is filled in the closed cross-section structure 24 of the front pillar 12 and the closed cross-section structure 42 of the rocker 40.
6 may be filled in another closed cross-section structure portion such as a center pillar or a side member. Further, a work hole for welding or the like may be used as the foam insertion hole.

[0025]

The foam filling method of the present invention is such that a press-molded part is welded and assembled to undercoat a white body, and then the foam before foaming is inserted and filled into the closed cross-section structure portion of the car body. After that, since the foam is foamed by heating while passing through the drying furnace for the intermediate coating and the top coating, there is an excellent effect that it is possible to prevent the generation of rust inside the structural member with the closed cross section.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle body to which a foam filling method according to an embodiment of the present invention is applied, as seen from the rear diagonal inside of the vehicle body.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a cross-sectional view showing the foam of FIG. 2 after foaming.

4 is a sectional view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

6 is a cross-sectional view showing the foam of FIG. 4 after foaming.

FIG. 7 is a cross-sectional view showing the foam of FIG. 5 after foaming.

FIG. 8 is a perspective view showing a vehicle body to which a foam filling method according to a conventional example is applied, as seen obliquely from the front of the vehicle body.

[Explanation of symbols]

 10 Car Body 12 Front Pillar 14 Center Pillar 16 Foam Body Insertion Hole 18 Foam Body Insertion Hole 24 Closed Cross Section Structural Section 28 Support Plate 40 Rocker 42 Closed Cross Section Structural Section 44 Partition Plate

Claims (1)

[Claims] 1. A dry oven for precoating a foamed body before foaming into a body having a white body formed by welding and assembling a press-molded part, and then inserting and filling the foamed body into a structure of a closed cross section of the body, and then performing intermediate coating and topcoating. A method for filling a foam, wherein the foam is foamed by heating during passage.