JPH0842543A - Method and structure for attaching nut with seal - Google Patents

Abstract

PURPOSE:To prevent the infiltration of a covering material into a screw hole in a very simple method, when the covering material is applied after a nut is attached to a work. CONSTITUTION:Before a nut 4 is fixed facing a bolt hole 8 on one surface of a work 1, such as a wheel house panel, in which a bolt hole 8 is formed, the edge of an opening 10a on the opposite work side of the screw hole 10 of the nut 4 is coated with a foaming agent 9. After the opening 10a on the opposite work side is closed with a foam-molded product 9' molded through foaming of the foaming agent 9, the work 1 and the nut 4 are both covered with the covering material, for example, polyvinyl chloride resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting method and a mounting structure for a nut with a seal fixed to a wheel house panel of an automobile.

[0002]

2. Description of the Related Art For example, as shown in FIG. 5, a wheel house panel 1 of an automobile has a bracket 6 bolted up for mounting various parts (for example, a washer tank) 5 on the engine room 3 side. Therefore, it is necessary to fix the nut 4 for screwing the bolt 7 to the tire house 2 side of the wheel house panel 1.

By the way, the tire house 2 side of the wheel house panel 1 is to be covered with a covering material 11 made of polyvinyl chloride resin after the nut is fixed, and the screw hole 10 of the nut 4 is covered with the covering material 11 when the covering material is applied. Dressing 1
1 may invade. Then, there arises a problem that it becomes difficult to screw the bolt onto the nut 4.

Therefore, as shown in FIG. 7, the lid 2 for closing the screw hole 10 on the side opposite to the wheel house panel of the nut 4 fixed to the tire house 2 side of the wheel house panel 1.
It has been proposed to provide 0 to prevent the coating material 11 from entering the screw hole 10 (see, for example, JP-A-63-23015).

[0005]

By the way, as shown in FIG. 6, the fixing of the nut to the wheel house panel is performed with the welding machine in a state where the nut 4 is positioned at a position corresponding to the bolt hole 8 of the wheel house panel 1. One electrode 12 of A is inserted into the screw hole 10 of the nut 4, and the other electrode 1
3 is performed while pressing the nut 4 toward the wheel house panel 1 side. However, in the case of the above-described known example, since the nut 4 is provided with the lid 20, the insertion degree of the electrode 12 to be inserted into the screw hole 10 cannot be sufficiently obtained, and the nut 4 is tilted or positioned. It can be difficult. To avoid this, a dedicated nut and parts feeder are required.

As a method for avoiding the problems in the above-mentioned known example, there is a method in which a coating material is applied after the opening on the side opposite to the wheel house panel of the screw hole in the nut fixed to the wheel house panel is closed by masking. Since the masking work before coating the coating material is performed on the vehicle body located on the line, it becomes an upward work, resulting in a problem that it becomes heavy work.

The present invention has been made in view of the above points, and in the case where the coating material is applied after the nut is attached to the workpiece, the coating material for the screw holes is applied to the screw holes when applying the coating material by a very simple method. The purpose is to prevent intrusion.

[0008]

According to a method of mounting a nut with a seal of the present invention, a nut is fixed to one surface of a work (for example, a wheel house panel) having a bolt hole corresponding to the bolt hole. Before, a foaming agent is applied to the rim of the opening on the side opposite to the work in the screw hole of the nut, and the opening on the side opposite to the work is closed by a foam molding obtained by foaming the foaming agent, and then the work and the nut Both are coated with a coating material (for example, polyvinyl chloride resin).

The mounting method of the nut with seal of the present invention has the following preferred embodiments.

That is, the foaming agent is foamed at the time of welding the nut to the work, or at the time of electrodeposition coating of the work performed after the nut is fixed, or the welding of the nut to the work. It is preferable to perform it at the time of electrodeposition coating of the work performed after the fixing of the nut and from the viewpoint of easily and accurately positioning the nut and contributing to simplification of the process.

Further, when the nut is welded, it is preferable to insert one electrode into the threaded hole of the nut so that the nut can be positioned easily and accurately during welding.

The mounting structure of the nut with seal of the present invention is as follows.
A nut is fixed to one surface of a work (for example, a wheel house panel) in which a bolt hole is formed, corresponding to the bolt hole, and a non-work side opening in the screw hole of the nut is foamed with a foaming agent. It is characterized in that it is closed by the foamed molded product obtained by the above and the work and the nut are both covered with a covering material (for example, polyvinyl chloride resin).

[0013]

With the method and structure for mounting a nut with a seal according to the present invention, the following effects can be obtained by the above means.

That is, the opening on the side opposite to the work in the screw hole of the nut fixed to the work (for example, the wheel house panel) is to be closed by the foam molding obtained by foaming the foaming agent. It is possible to prevent the coating material from entering the screw holes of the nut when applying the coating material (for example, polyvinyl chloride resin) without taking special measures such as providing a lid or masking, and foaming the foaming agent. By fixing the nut at the same time as (or) after fixing the nut, the nut can be fixed easily and accurately.

In the method of mounting a nut with a seal according to the present invention, the foaming agent is foamed at the time of welding the nut to the work, or at the time of electrodeposition coating of the work performed after the nut is fixed, Alternatively, when the nut is welded to the work and the work is performed by electrodeposition coating performed after the nut is fixed, positioning of the nut becomes easy and accurate, and the process can be simplified.

Further, when one of the electrodes is inserted through the threaded hole of the nut when the nut is welded,
Positioning of the nut during welding can be performed easily and accurately.

[0017]

According to the method and structure for mounting a nut with a seal of the present invention, the anti-work side opening in the screw hole of the nut fixed to the work (for example, a wheel house panel) causes the foaming agent to foam. Since it is to be closed by the foamed molded product obtained, it can be applied to the screw hole of the nut when applying the covering material (for example, polyvinyl chloride resin) without special measures such as providing a lid or masking. In addition to preventing the coating material from entering, if the foaming agent is foamed at the same time as (/) after the nut is fixed, the nut can be fixed easily and accurately, which simplifies the process. There is an excellent effect that the structure can be simplified.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 and 2 show a mounting structure of a nut with a seal and a procedure of a mounting method according to a first embodiment of the present invention.

In this embodiment, as shown in FIG.
The wheel house panel 1 is used as a work, and one surface of the wheel house panel 1 (in this embodiment, the tire house 2
It is supposed that the nut 4 is fixed to the side).

The wheel house panel 1 has a bolt hole 8 for inserting a bolt 7 for mounting a bracket 6 for supporting various parts (for example, a washer tank) 5 arranged on the engine room 3 side. Has been formed.

Then, on the tire house 2 side of the wheel house panel 1, a nut 4 is fixed in correspondence with the bolt hole 8, but as shown in FIG. Opening 10a in the screw hole 10 opposite to the wheel house panel side (in other words, the tire house 2 side)
The foaming agent 9 is applied to the rim of the. The application of the foaming agent 9 is limited to the edge of the opening 10a, and most of the screw holes 10 are opened.

The fixing of the nut 4 to the wheel house panel 1 is performed by welding with a welding machine A (see FIG. 4) as described in the section of the prior art. In the case of this embodiment, the nut 4 is fixed. Since the screw hole 10 is almost opened, the electrode 12 inserted in the screw hole 10 can penetrate the screw hole 10. Therefore, the positioning of the nut 4 can be easily and accurately performed by the electrode 12.

Nut 4 positioned as described above
When welding is performed while applying pressure to the other electrode 13, the melted portion 4a of the nut 4 is melted by the welding heat, and as shown in FIG.
It is fixed to the wheel house panel 1 as shown in,
At the same time, the foaming agent 9 applied to the rim of the opening 10a opposite to the wheel house panel side of the screw hole 10 (in other words, the tire house 2 side) foams due to welding heat to cause volume expansion,
The side opposite to the wheel house panel of the screw hole 10 (in other words,
The opening 10a on the tire house 2 side is closed by the foam molding 9 '. The welding temperature is a high temperature of 200 ° C. or higher, and the high temperature state is continued for about 6 seconds. Therefore, if a foaming agent (for example, acrylic emulsion-based thermally foamed resin) that completely foams under the temperature condition is selected, Opening 1 on the side opposite to the wheel house panel of the screw hole 10 (in other words, on the side of the tire house 2) by the foam molding 9'only by the welding heat
0a can be blocked.

After that, through the electrodeposition coating process, the tire house 2 side of the wheel house panel 1 and the nut 4 are covered with a covering material (polyvinyl chloride resin in this embodiment) 11. Since the opening 10a on the wheel house panel side (in other words, the tire house 2 side) is closed by the foam molding 9 ', the foam molding 9'prevents the covering material 11 from entering the screw hole 10. . Therefore, the screw hole 10 of the nut 4 is maintained in a normal state, and the bolt 7 is normally screwed to the nut 4 when the bracket 6 is bolted up.

As described above, according to this embodiment, the screw hole 10 of the nut 4 fixed to the wheel house panel 1 is provided.
Since the opening 10a on the side opposite to the workpiece is closed by the foamed molded body 9'obtained by foaming the foaming agent 9, the opening is covered without any special means such as providing a lid or masking. When the coating material 11 (for example, polyvinyl chloride resin) is applied, the coating material 11 does not enter the screw hole 10 of the nut 4 and the foaming of the foaming agent 9 is fixed to the nut 4 (in other words, welding). Since it is done at the same time, nut 4
Can be easily and accurately fixed, and the process and the structure can be simplified.

Further, since the one electrode 12 is inserted through the screw hole 10 of the nut 4 when the nut 4 is welded, the nut 4 can be easily and accurately positioned at the time of welding.

Second Embodiment FIG. 3 shows a procedure of a method of attaching a nut with a seal according to a second embodiment of the present invention.

In the present embodiment, as the foaming agent 9, a foaming agent that does not foam during welding but completely foams in the subsequent electrodeposition coating step is adopted. The temperature in the electrodeposition coating step is about 180 ° C., which is lower than the welding temperature, but the duration is long, about 30 minutes, so complete foaming can be obtained by using the foaming agent 9 suitable for this temperature condition. As the foaming agent 9 used in this case, a foaming agent that does not foam by heating for a short time as in welding but foams by heating for a long time is used. Therefore, in the case of the present embodiment, when the welding is completed, as shown in FIG. 3B, the foaming agent 9 is not foamed, and at the end of the electrodeposition coating step, as shown in FIG. As a result of the complete foaming, the opening 10a of the screw hole 10 on the side opposite to the wheel house panel (in other words, on the side of the tire house 2) is closed by the foam molding 9 '. Other configurations, functions, and effects are the same as those in the first embodiment, and the description thereof will be omitted to avoid duplication.

Third Embodiment FIG. 4 shows a procedure of a method of attaching a nut with a seal according to a third embodiment of the present invention.

In the present embodiment, as the foaming agent 9, a foaming agent which is slightly foamed at the time of welding and is completely foamed in the subsequent electrodeposition coating step is adopted. In the case of the present embodiment, the temperature condition at the time of welding is high temperature, but for a short time,
Considering that sufficient foaming cannot be obtained when the foaming agent 9 is of a type that does not sufficiently foam in a short time or when the welding heat is not satisfactorily transferred to the foaming agent 9, it is lower than the welding temperature. It is about 180 ℃, but the duration is about 30
It is designed to obtain complete foaming in a long and long electrodeposition coating process. Therefore, in the case of the present embodiment, when the welding is completed, as shown in FIG. 4B, the foaming agent 9 is slightly foamed, but the screw hole 10 is on the side opposite to the wheel house panel (in other words, the tire house). 2 side) The opening 10a has not been closed yet.
As shown in FIG. 1, the opening 1 is completely foamed to the side opposite to the wheel house panel of the screw hole 10 (in other words, the tire house 2 side).
0a is closed by the foamed molded body 9 '.
Other configurations, functions, and effects are the same as those in the first embodiment, and the description thereof will be omitted to avoid duplication.

In the above description, a wheel house panel is used as the work and a polyvinyl chloride resin is used as the coating material. However, other automobile members may be used as the work, and another resin is used as the coating material. Needless to say, may be used.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a mounting structure for a nut with a seal according to a first embodiment of the present invention.

FIG. 2A is a cross-sectional view showing a state during welding in the method of attaching the nut with a seal according to the first embodiment of the present invention,
(B) is a cross-sectional view showing a state after welding.

FIG. 3 (a) is a cross-sectional view showing a state at the time of welding in the method of attaching the nut with a seal according to the second embodiment of the present invention,
(B) is a sectional view showing a state after welding, and (C) is a sectional view showing a state after completion of the electrodeposition coating step.

FIG. 4A is a cross-sectional view showing a state at the time of welding in the method of mounting the nut with seal according to the third embodiment of the present invention,
(B) is a sectional view showing a state after welding, and (C) is a sectional view showing a state after completion of the electrodeposition coating step.

FIG. 5 is a sectional view of an essential part showing a conventional mounting structure of a nut with a seal.

FIG. 6 is a cross-sectional view showing a state during welding in the conventional nut mounting method with a seal.

FIG. 7 is an explanatory diagram illustrating a welding process in a conventional nut mounting method with a seal.

[Explanation of symbols]

1 is a work (wheel house panel), 2 is a tire house, 3 is an engine room, 4 is a nut, 7 is a bolt, 8
Is a bolt hole, 9 is a foaming agent, 9'is a foam molded body, 10 is a screw hole, 10a is an opening on the side opposite to the work (anti-wheel house panel side opening), 11 is a covering material (polyvinyl chloride resin),
12 and 13 are electrodes.

Claims (10)

[Claims] 1. A foaming agent is applied to the rim of the non-work side opening in the threaded hole of the nut before the nut is fixed to one surface of the work in which the bolt hole is formed so as to correspond to the bolt hole. A method for mounting a nut with a seal, characterized in that the work and the nut are both covered with a covering material after the opening on the side opposite to the work is closed by a foamed molded body obtained by foaming the foaming agent. 2. The foaming of the foaming agent is performed at the time of welding the nut to the work.
How to install the nut with seal described. 3. The method for mounting a nut with a seal according to claim 1, wherein the foaming agent is foamed during electrodeposition coating of the work, which is performed after the nut is fixed. 4. The seal according to claim 1, wherein the foaming agent is foamed at the time of welding the nut to the work and at the time of electrodeposition coating of the work performed after the nut is fixed. How to install the nut. 5. The method according to any one of claims 1 to 4, wherein the coating material is polyvinyl chloride resin.
The method for installing a nut with a seal according to any one of 1. 6. The work according to claim 1, wherein the work is a wheel house panel.
The method for installing a nut with a seal according to any one of 1. 7. The mounting of a nut with a seal according to claim 1, wherein one electrode is inserted into a threaded hole of the nut when the nut is welded. Method. 8. A nut is fixed to one surface of a work having a bolt hole in correspondence with the bolt hole,
A non-work side opening in the screw hole of the nut is closed by a foam molding obtained by foaming a foaming agent, and the work and the nut are both covered with a covering material. Nut mounting structure. 9. The mounting structure for a nut with a seal according to claim 8, wherein the covering material is polyvinyl chloride resin. 10. The mounting structure for a nut with a seal according to claim 8, wherein the work is a wheel house panel.