JP2006306335A - Method of coupling dissimilar plate materials - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of coupling dissimilar plate materials, capable of easily and promptly performing complete galvanic corrosion protection, and attaining ease of work and cost reduction. <P>SOLUTION: This method is a method of coupling different types of plates in which both the plates 4, 5 are jointed in a laminated state by inserting a fastening member 8 into through holes O respectively opened and provided at a first plate 4 and a second plate 5 made of a metal material different from the first plate 4, and fastening the fastening member 8. Electric insulation adhesive tape T is made to adhere to either of the contact surfaces of both the plates 4, 5 in advance, both the plates 4, 5 are layered, and then the fastening member 8 of which surface facing at least both the plates 4, 5 is surface-treated is inserted and fastened. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for assembling dissimilar plate materials to prevent electrolytic corrosion that occurs between contact surfaces of different plate materials.

For example, a door of an automobile is provided with a door guard bar that increases resistance to side collision and increases safety. Recently, aluminum alloy is used for this door guard bar because of the demand for weight reduction, and the door guard bar is connected to the door panel via a steel plate bracket.
Since such brackets and door guard bars are dissimilar plate materials, they cannot be directly welded, and through holes are previously formed in both plate materials, and fastening members such as bolts are inserted and connected thereto.
However, even if firmly connected by the fastening member, there is a slight gap between the two, and if water or the like permeates into the gap, a potential difference may occur, and electric corrosion may occur. In particular, the door guard bar must be firmly connected due to its nature, but depending on the progress of the electrolytic corrosion, the connection by the fastening member may be loosened, and so-called looseness may occur.
Although electric corrosion can be prevented by coating or plating the door guard bar and the bracket, respectively, it is not preferable in terms of manufacturing cost.
For this reason, in the following patent document, not only between the contact surfaces of the bracket and the door guard bar, but also a sealer is applied in the through hole provided in the bracket and the door guard bar, not only insulating the contact portion, but also intrusion of moisture And prevent caries.
Japanese Patent No. 3127085 (abstract, see FIG. 1)

However, the sealer used in the door guard bar is a viscous fluid (for example, liquid silicon), which cannot be made to enter a narrow portion by simply applying it, and is incomplete as an electric corrosion prevention work. It is easy to become a thing. In addition, it is extremely difficult to distribute the viscous fluid in the through-hole, which requires work man-hours and tact time, and has problems in terms of workability and manufacturing cost. Furthermore, there is a problem that it is extremely difficult to remove the sealer when it adheres to a person's hand or clothes.
The present invention has been made to solve the problems associated with the above-described prior art, and can easily and quickly prevent complete electric corrosion, and is advantageous in terms of workability and manufacturing cost. An object of the present invention is to provide a method for assembling different types of plate materials.
In order to achieve the above object, the invention described in claim 1 is provided with a through hole in each of the first plate member and the second plate member made of a metal material different from the first plate member. A method of assembling different kinds of plate materials in which the both plate materials are connected in a stacked manner by inserting and fastening a fastening member to the plate, and an electrically insulating adhesive tape is previously attached to one of the contact surfaces of the both plate materials Then, after stacking the two plate members, the dissimilar plate member assembling method is characterized by inserting and tightening the fastening member having at least a surface opposite to the two plate members surface-treated.

According to the present invention, since the fastening member is inserted and tightened in a state in which the electrically insulating adhesive tape is stuck in advance on the contact surface of the dissimilar plate material, more complete electric corrosion prevention can be achieved only by sticking the tape. Moreover, the task of applying the tape is different from the operation of applying the sealer, and it is extremely simple and quick and does not adhere to human hands or clothes. But it is very advantageous.
In addition, if surface-treated fasteners are used, even if water or the like may enter between the inner surfaces of the through-holes of both plate members and the fastening member after fastening, the occurrence of electrolytic corrosion is completely prevented. it can.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of FIG. 1, FIG. 3 is a plan view showing a connection state between a bracket and a door guard bar, and FIG. It is sectional drawing which follows a line.
As shown in FIG. 1, an automobile door includes an inner panel 1 and an outer panel 2, and a door main body 3 is formed. Inside the door main body 3, various mechanisms (not shown) such as a window glass elevating mechanism are provided. A door guard bar 4 extending in the front-rear direction of the vehicle is provided.
The door guard bar 4 is a tube (see FIG. 4) having a rectangular cross section in order to increase the fracture resistance against a side collision, but both ends are scraped to a tapered shape and spot welded to the outer panel 2 via the bracket 5. They are connected by S or the like.
Since the bracket 5 and the outer panel 2 are made of a steel plate, spot welding S can be performed. However, the door guard bar 4 is made of an aluminum alloy such as duralumin for weight reduction, so it is directly connected to the bracket 5 that is a steel plate. Can't weld.
Therefore, as shown in FIG. 2, the door guard bar 4 and the bracket 5 are connected to each other by forming a through hole O in the bracket 5 and the door guard bar 4 and inserting a fastening member 8 including a bolt 6 and a nut 7 therethrough. is doing. The fastening member 8 may be a bolt 6 and a nut 7 that are separate from the bracket 5, but may be a member that is previously welded to the bracket 5 like a so-called weld nut.
In particular, in this embodiment, in order to prevent electrolytic corrosion occurring between the contact surfaces of the door guard bar 4 and the bracket 5, an electrically insulating adhesive tape T is previously applied to one of the contact surfaces of the door guard bar 4 and the bracket 5. After that, the two are fastened and fixed by the fastening member 8. As the adhesive tape T, a heat-resistant tape in which a silicone-based adhesive material is applied to a fluororesin film, for example, Nittofuron adhesive tape No. 1 manufactured by Nitto Denko Corporation. It is preferable to use 903UL or the like.
In using such an adhesive tape T, it is preferable to form the adhesive tape T corresponding to the shape or size of the contact surface between the bracket 5 and the door guard bar 4 by punching. As shown in FIG. 3, the punching process has a shape that matches the shape of the contact surface between the door guard bar 4 and the bracket 5. In this case, if the punching of the adhesive tape T is made slightly larger than the outer peripheral edge portion of the door guard bar 4 as shown by a one-dot chain line in FIG. 3, water does not collect between the two, and a local battery is generated due to a slight potential difference. Therefore, it is preferable that electrolytic corrosion can be more reliably prevented.
In this way, in order to prevent electric corrosion, if the adhesive tape T is punched between the contact surfaces of the door guard bar 4 and the bracket 5, the electric corrosion can be reliably prevented by simple work, and the door guard bar 4 and the bracket are protected. Adhesive tape T can be affixed to the entire contact surface 5, there is no local corrosion due to the occurrence of exposed portions or exposed portions in part, and it does not adhere to hands or clothes unlike sealers. Therefore, it is extremely advantageous in terms of workability and manufacturing cost.
However, even if the adhesive tape T is entirely applied to the contact surface between the door guard bar 4 and the bracket 5, the electric corrosion between the inner peripheral surface of the through hole O and the fastening member 8 cannot be completely prevented. In the present embodiment, the surface of the fastening member 8 that faces the inner peripheral surface of the through hole O provided in the bracket 5 and the door guard bar 4 is subjected to surface treatment. Here, as the surface treatment, for example, cationic coating is used, but any treatment may be used as long as it can form the electrical insulating film 9 that does not easily peel off. The surface treatment region may be a part of the surface of the bolt 6 and the nut 7 as shown in the grainy portion shown in a slightly exaggerated manner in FIG. 4, but it goes without saying that the entire surface may be surface treated. Yes.
If the main part of the fastening member 8 is surface-treated in this way, the door guard bar 4 can be removed without creating the cause of electric corrosion between the door guard bar 4 and the bracket 5 or between them and the fastening member 8. Can be attached to the vehicle door.
The door guard bar 4 is attached to the bracket 5 by the fastening member 8 and the door to which the bracket 5 is attached to the door main body 3 by spot welding S is later applied with paint and heated. It can withstand the heat of this heat treatment (generally about 180 ° C.). Since the sealer is cured only at the time of the heat treatment of the coating, it adheres to the clothes of various workers and is reduced in quantity until it is heat-treated after coating. Although this may be reduced, in the present embodiment, there is no problem in this respect.
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. For example, the embodiment described above relates to an aluminum alloy door guard bar and an iron bracket of an automobile, but can also be applied to the case where there is a possibility that electrolytic corrosion may occur due to a potential difference in other dissimilar plate materials. Moreover, the adhesive tape may be formed not only by punching but also by various cutting processes.

  The present invention can be applied to the assembly of an aluminum alloy door guard bar and an iron bracket of an automobile to prevent the occurrence of electrolytic corrosion.

It is sectional drawing which shows the shaping | molding apparatus which concerns on embodiment of this invention. It is a principal part expanded sectional view of FIG. It is a top view which shows the connection state of a bracket and a door guard bar. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG.

Explanation of symbols

4 ... door guard bar (first plate),
5 ... Bracket (second plate)
6 ... Bolt,
7 ... nuts,
8 ... Fastening member,
9: Electrical insulation film,
O ... through hole,
T: Adhesive tape.

Claims (6)

A through hole is formed in each of the first plate member and the second plate member made of a metal material different from the first plate member, and the two plate members are stacked by inserting and fastening a fastening member into the through hole. A method for assembling different kinds of plate materials connected in a shape,
After electrically sticking an electrically insulating adhesive tape to one of the contact surfaces of the two plate materials in advance and stacking the two plate materials, the fastening member having at least the surface facing the both plate materials is inserted. A method of assembling different kinds of plate materials, characterized by tightening. The method for assembling different kinds of plate materials according to claim 1, wherein the adhesive tape is stamped and formed to match the shape of the contact surfaces of the two plate materials. The method for assembling a dissimilar plate material according to claim 1 or 2, wherein the adhesive tape is made of a heat-resistant material that can withstand heating during coating. The said adhesive tape is a fluororesin tape, The assembly | attaching method of the dissimilar board | plate material in any one of Claims 1-3. The method for assembling different kinds of plate materials according to claim 1, wherein the fastening member has an electrically insulating coating film formed on at least a surface facing both the plate materials. The method for assembling different kinds of plate materials according to claim 1, wherein one of the plate materials is iron and the other is an aluminum alloy.

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