JP2007137262A - Reinforcing structure of plate material jointing part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure of a plate material jointing part free to easily construct it, to secure sufficient strength of it and to reinforce a jointing part of a plate material to which spot welding is applied. <P>SOLUTION: The reinforcing structure of the plate material jointing part 1 is constituted by spot-welding and connecting the neighborhood of end parts with every required interval by making a plurality of plate materials roughly match on the end part of one of the plate materials and the end parts of the other plate material. In this case, front and back surfaces of the plate material jointing parts including the end surfaces of both of the plate materials are covered with a surface hardened part 3 hardened by coating thermosetting resin 5 on a covered layer made of reinforced fiber sheet material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention mainly relates to a structure for reinforcing a plate material joint of a vehicle body, particularly a spot welded plate material joint.

For example, the body of an automobile usually adopts a monocoque structure, and a thin steel plate of about 1 to 2 mm press-molded into a required shape is overlapped at the joint, and this overlapped portion is joined by spot welding to form a box It is in shape.
Spot welding is generally performed at a relatively wide pitch with an interval of 50 mm. For this reason, a large number of non-welded portions exist between the welded portions, and sufficient rigidity cannot be obtained, and the vehicle body structure is twisted due to the movement of the tire during traveling. This twist affects the maneuverability and running performance of the vehicle.

In order to increase the torsional rigidity, it is conceivable to reduce the pitch of spot welding or to perform post-welding further on the non-welded portion between spot welds.
As a vehicle body reinforcement structure, there is a technique described in Patent Document 1 described below, but this technique does not attempt to reinforce a non-welded portion between spot welds.

Utility Model Publication No. 6-53355

However, if the spot welding pitch is narrowed, it takes much time to form the body.
In addition, when post welding is performed between spot welds, carbon dioxide gas welding is performed because a pinching type welding machine cannot be used. Carbon dioxide gas welding is performed by making a hole in one steel plate of the overlapped portion using a tool such as a drill and welding the periphery of this hole to the other steel plate. For example, in the case of spot welding with a pitch of 50 mm, at least five holes with a diameter of 6 mm are drilled in the non-welded portion and carbon dioxide gas welding is performed. However, carbon dioxide welding requires many holes to be drilled and welded, which is not only time consuming but also cumbersome. In addition, since one steel plate has a large number of holes having a diameter of 6 mm, the strength as expected in the welded portion cannot be obtained.

  In view of such a problem, the present invention provides a reinforcing structure for a plate material joint that can be easily constructed and can be reinforced with sufficient strength for a joint of a plate material subjected to spot welding. There is to do.

In order to solve the above problems, the present invention has the following configuration.
The invention according to claim 1 is a reinforcing structure of a plate material joint portion in which the vicinity of the matched end portions of a plurality of plate materials is joined by spot welding at every required interval, and includes a plate material joint portion including end surfaces of both plate materials. The front and back surfaces are characterized in that they are provided with a surface cured portion obtained by applying a thermosetting resin to a coating layer made of a reinforcing fiber sheet material and curing it.

The invention according to claim 2 is a plate material joint in which a plurality of plate materials are joined by spot welding at the required intervals in the vicinity of the end portions so that the end portion of one plate material is positioned on the plate surface of the other plate material. Part of the reinforcing structure, a surface-curing part obtained by applying a thermosetting resin to a covering layer made of a reinforcing fiber sheet material and curing it from the surface of the joint near the end of one plate to the surface of the other plate It is characterized by having a point.

The invention according to claim 3 is the reinforcing structure of the plate material joint portion according to the aspect of claim 1, wherein the adhesive is filled in the gap formed between the end portions of the spot-welded plate material, and the adhesive is solidified. By covering the front and back surfaces of the gap cured portion and the plate joint portion in the vicinity of both plate material end portions including the gap cured portion with a reinforcing fiber sheet material, and applying and curing a thermosetting resin on the reinforcing fiber sheet material It is characterized by having a surface hardened portion formed.

The invention according to claim 4 is the reinforcing structure of the plate material joint portion according to the aspect of claim 2, and is generated between the end portion of the one plate material spot-welded and the surface portion of the other plate material. Reinforced fiber sheet material is used to fill the surface of the other plate material from the gap cured portion formed by filling the gap with adhesive and solidifying the adhesive, and the joint portion in the vicinity of the end portion of one plate material including the gap cured portion. It is characterized in that it is provided with a surface-cured portion formed by applying and curing a thermosetting resin on the reinforcing fiber sheet material.

The plate material joint may be one in which screws are fastened between spot welds. The screw is preferably a tapping screw having a thin T-shaped head.
The glass fiber cloth is most suitable for the reinforcing fiber sheet material.
As the thermosetting resin, an epoxy resin or a polyester-polyurethane resin can be applied.
The plate material joint to which the present invention is applied can be applied to various joints as long as it is a spot welded joint. For example, it may be applied to a joint between an inner panel and an outer panel of a vehicle body.

According to the present invention, a plate material joined portion obtained by spot welding the vicinity of the end portions at every required interval so that the end portions of the plurality of plate materials are substantially matched, or the end portion of one plate material is the other end. For the plate joint joined by spot welding at the required intervals around the end so as to be located on the plate surface of the plate, the front and back surfaces of the plate joint including the end faces of both plate members, or one of the plate members Since the surface portion of the other plate material from the joint portion in the vicinity of the end portion is covered with the surface hardened portion obtained by applying the thermosetting resin to the reinforcing fiber sheet material and cured, the entire surface welded joint portion is the surface hardened portion. Therefore, the joint portion can have sufficient strength and rigidity.
In addition, since the thermosetting resin is only applied by covering the joint with the reinforcing fiber sheet material, the construction work can be performed relatively easily.

In the case of the inventions according to claims 3 and 4, a gap hardening portion filled with an adhesive and solidified in a gap generated between spot welded plate materials is provided, and the front and back surfaces of the plate material joint portion including the gap hardening portion are provided. Since it is covered by the surface hardened portion, it is possible to obtain even higher strength and rigidity in the spot-welded plate material joint.

Hereinafter, embodiments of the present invention will be described in detail with reference to the examples shown in FIGS.
FIG. 1 is a schematic cross-sectional view of a joint reinforcement structure according to an embodiment of the present invention.
In the figure, reference numeral 1 is a joint portion in which the upright pieces 2 and 2 of the two steel plates bent in an L shape face each other back to back and are spot-welded at a required interval along the length direction. The joint 1 is in a state in which the upper ends of the upright pieces 2 and 2 of the steel plate material are substantially aligned, and almost no gap is formed between the upright pieces.
3 is a surface hardening part which covered the whole surface of the junction part 1, ie, the standing piece surface including the upper end of the standing pieces 2 and 2 of both steel plate materials. The surface hardened portion 3 is obtained by applying a thermosetting resin 5 to a reinforcing fiber sheet 4 made of glass cloth, carbon cloth kevlar cloth, or the like and curing it. An epoxy resin or a polyester resin is used as the thermosetting resin.
A plurality of reinforcing fiber sheets forming the surface hardened portion may be layered.

This reinforcing structure is formed as follows.
First, the entire spot welded joint 1 is covered with the reinforcing fiber sheet material 4. The reinforcing fiber sheet material 4 is arranged in close contact with the surface of the joint 1.
Next, the thermosetting resin 5 is applied from above the reinforcing fiber sheet material 4 so as to be impregnated into the reinforcing fiber sheet material. Then, hot air of about 40-60 ° C. is blown to cure the thermosetting resin 5.
The joined portion of both steel sheets is firmly integrated by the formed surface hardened portion 5.

FIG. 2 shows a joint portion 11 in which the upright pieces 12 and 12 of two steel plate materials bent in an L-shape are faced back to back in the same manner as in FIG. 1 and spot-welded at a predetermined interval along the length direction. It is an example which has the clearance gap 16 between standing pieces.
The gap 16 is provided with a gap hardening portion 17 filled with an adhesive and solidified. As the adhesive, for example, an epoxy resin or a polyurethane resin is used.
The surfaces of both standing pieces including the gap hardening portion 16 are covered with a reinforcing fiber sheet material 14, and a thermosetting resin 15 is applied to the reinforcing fiber sheet material 14 and cured. The surface hardened portion 13 has the same structure as the surface hardened portion 3 in the case of the embodiment shown in FIG.

In this reinforcing structure, the adhesive is filled in the gap of the joint portion 11 prior to the formation of the surface hardened portion 13, and after forming the gap hardened portion 17, the surface hardened portion 13 is formed in the same manner as described above. It will be constructed.

FIG. 3 shows a case where the welded portions of both steel plates are different from those shown in FIGS. 1 and 2 and spot welding is performed by shifting the joined ends of both steel plates in the plane direction. That is, the end 32 a of the other steel plate material 32 is positioned on the plate surface of the one steel plate material 22.
Reference numeral 24 in the figure is a coating layer made of a reinforcing fiber sheet material covering from the surface of the joint portion in the vicinity including the end portion 32a of the other plate material 32 to the surface portion of the one plate material 22, and the coating layer 24 is thermally cured. The surface cured portion 23 is formed by applying and curing the resin 25.
As the reinforcing fiber sheet material, any glass fiber, aramid fiber or carbon fiber formed in a cloth shape may be used. For example, a glass cloth having a tape shape with a width of 50 mm and a mass of 150 g / cm 2 to 350 g / cm 2 is desirable. .

In addition, although not shown in the drawings, a plurality of plate members are joined by spot welding at the required intervals around the end portion so that the end portion of one plate member is positioned on the plate surface of the other plate member. In the case where a gap is provided between the front surface of one plate material and the back surface of the other plate material (in the example of FIG. 3, a gap is generated between the standing piece of one plate material and the standing piece of the other plate material. The present invention can be applied in the same manner.
In this case, the gap between the joints is filled with an adhesive to form a gap hardening portion.
Further, around the gap cured portion, a surface cured portion formed by applying a thermosetting resin to a coating layer made of a reinforcing fiber sheet material is provided.

In each of these examples, a tapping screw may be screwed along the longitudinal direction of the joint portion in the joint portion having the surface hardened portion or the surface hardened portion and the gap hardened portion. The tapping screw preferably has a T-shape with a thin head and a flat surface. These screws do not cause the head to protrude unnecessarily and do not interfere with subsequent processing on the joint.

The tensile strength of spot welding is a high-quality welding machine such as a vehicle manufacturing factory, and the welded part diameter is 5 to 6 mm, about 240 kgf / cm2, and the welded part diameter is 3 mm with a welding machine usually used in repair shops. 120 kgf / cm 2. In a repair shop or the like, the voltage and performance of the welding machine are different, so that not only the strength is lowered, but also variations occur.
On the other hand, the average strength when the five test pieces were joined using an adhesive mainly composed of an epoxy resin was 300 kgf / cm <2>.
Therefore, the tensile strength of the joint when using the adhesive is comparable to the tensile strength when welding with a high-quality welder.
Further, the bending strength of the surface-cured portion obtained by applying and curing an epoxy resin as a thermosetting resin on the reinforcing fiber sheet material was 3500 kgf / cm.

From these facts, in the reinforcing structure according to the present invention, in the case of a reinforcing structure in which a surface hardening portion is provided at a non-welded portion of spot welding or a gap hardening portion is used in combination with this, even when a twist occurs in the joint portion Compensate for sufficient stiffness.

Sectional drawing which shows schematically the reinforcement structure of the spot welding junction part which concerns on one Example of this invention. Sectional drawing which shows schematically the reinforcement structure of the spot welding junction part which concerns on the other Example of this invention. Sectional drawing which shows schematically the reinforcement structure of the spot welding junction part which concerns on another Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Joint part 2,12,22,32 Standing piece of steel plate 3,13,23 Surface hardening part 4,14,24 Reinforcing fiber sheet material 5,15,25 Thermosetting resin 16 Clearance between standing pieces 17 Clearance hardening Part

Claims (10)

A reinforcing structure of a plate material joining portion in which a plurality of plate materials are joined by spot welding at a predetermined interval in the vicinity of the end portion so that an end portion of one plate material and an end portion of the other plate material are substantially matched. ,
The front and back surfaces of the plate material joint portion including the end surfaces of both plate materials are covered with a surface hardened portion obtained by applying a thermosetting resin to the coating layer made of the reinforcing fiber sheet material and curing it.
The reinforcing structure of the board | plate material junction part characterized by the above-mentioned. A reinforcing structure of a plate material joint portion in which a plurality of plate materials are joined by spot welding of the vicinity of the end portion at every required interval so that the end portion of one plate material is positioned on the plate surface of the other plate material,
The surface portion of the other plate material is covered with the reinforcing fiber sheet material from the joint portion in the vicinity of the end portion of one plate material, and the surface cured portion is formed by applying and curing a thermosetting resin on the reinforcing fiber sheet material. The
Reinforcement structure for plate joints. A reinforcing structure of a plate material joining portion in which a plurality of plate materials are joined by spot welding at a predetermined interval in the vicinity of the end portion so that an end portion of one plate material and an end portion of the other plate material are substantially matched. ,
A gap cured portion formed by filling an adhesive into a gap generated between the end portions of the spot-welded plate material and solidifying the adhesive; and
A surface hardened portion formed by covering the front and back surfaces of the plate material joint portion in the vicinity of both plate material end portions including the gap hardened portion with a reinforcing fiber sheet material, and applying and curing a thermosetting resin on the reinforcing fiber sheet material; With
The reinforcing structure of the board | plate material junction part characterized by the above-mentioned. A reinforcing structure of a plate material joint portion in which a plurality of plate materials are joined by spot welding of the vicinity of the end portion at every required interval so that the end portion of one plate material is positioned on the plate surface of the other plate material,
A gap hardening portion formed by filling an adhesive into a gap generated between the end portion of the one plate material spot-welded and the surface portion of the other plate material, and solidifying the adhesive;
It is formed by covering the surface portion of the other plate material from the joint portion in the vicinity of the end portion of one plate material including the gap hardening portion with a reinforcing fiber sheet material, and applying and curing a thermosetting resin on the reinforcing fiber sheet material. With a hardened surface portion,
Reinforcement structure for plate joints. In the reinforcement structure of the board | plate material junction part in any one of Claim 1 to 4,
Screws are fastened between spot welds of the plate material joint,
Reinforcement structure for plate joints. The reinforcing fiber sheet material is a glass cloth,
The reinforcement structure of the board | plate material junction part in any one of Claim 1 to 4. The thermosetting resin is an epoxy resin.
The reinforcement structure of the board | plate material junction part in any one of Claim 1 to 4. The thermosetting resin is a polyester resin.
The reinforcement structure of the board | plate material junction part in any one of Claim 1 to 4. The screw is a tapping screw having a thin T-shaped head.
The reinforcement structure of the board | plate material junction part of Claim 5. The plate members to be joined are an inner panel and an outer panel of a vehicle body,
The reinforcement structure of the board | plate material junction part in any one of Claim 1 to 4.