JPH09295160A - Joined structural member and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the appropriate energy absorption characteristic as a vehicle body with small increase in weight, and to improve the productivity by jointly using the adhesive and a spot welding method in joining a reinforced plate. SOLUTION: A reinforced plate 4 to which the adhesive is applied is fixed to a closing plate 2 by the spot welding in advance, the closing plate 2 is integrated with a side member 1 at spot-welded parts, a conductive metal block is inserted in a space of the closed section inside the member, and the spot welding is performed using a spot welding machine in which the block and a conventional electrode for the spot welding are one pair of electrodes. Even a structure in which the reinforced plate is installed on the closing plate side can be easily assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joined structural member and a method for manufacturing the same, and more particularly to a member of an automobile body, which includes a front side member, a hood rich reinforcement, an extension member, a rear side member, a side sill and a cross member. The present invention relates to a joint structure of a member structure, and more particularly, to a joint structure member in which a reinforcing member using an adhesive is provided at a joint portion of a joint structure member having a closed cross-section structure, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, spot welding has been used when assembling members of an automobile body. Also,
Regarding side sills, pillars, etc., vehicle bodies having a joint structure in which spot welds and structural adhesives are used together and the adhesive portions and the welded portions coexist on the same flange surface are mass-produced.

As described above, by using the bonding and the spot welding together for the joining of the above-mentioned members, the effects of significantly improving the vehicle body rigidity and the vehicle system vibration characteristic are obtained. Further, in the case of a joint structure member having a closed cross-section structure, which is used as a member such as a front side member or a rear side member to which an impact load is input at the time of a vehicle collision, in order to optimize the crushing characteristics of the vehicle as a whole, Reinforcing plates are spot-welded to the parts.

[0004]

However, since the installation position and shape of the reinforcing plate are designed on the premise of spot welding, the energy absorption characteristics of the vehicle body have not been optimized with the minimum weight increase. However, there is a problem that it goes against the weight reduction of the vehicle body. On the contrary, when the reinforcing plate is installed at an appropriate position, the assembly process of spots and the like becomes complicated, which may cause a problem that productivity is deteriorated. Therefore, it is an object of the present invention to provide a joined structural member and a method for manufacturing the joined structural member, which are capable of increasing proper productivity and energy absorption with a small amount of energy absorption.

[0005]

Means for Solving the Problems The inventors of the present invention have made extensive studies as a result of solving the above-mentioned problems. Installed in an adhesive, and a joining method using an adhesive and a point joining method, for example, a joining method using a joining method using spot welding joining or mechanical joining together,
The present invention has been accomplished by finding out that proper energy absorption characteristics as a vehicle body can be increased with a small weight and productivity can be increased.

The above object of the present invention is to join a flanged surface having a closed cross-section structure by a point-joining method or a point-joining method in which an adhesive is used in combination, and a reinforcing plate is installed from the inside of the closed-section structural member. In the above, the present invention has been achieved by a joint structure member characterized by using an adhesive and a point joining method together for joining the reinforcing plate, and a manufacturing method thereof.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In general, a joint structure member absorbs a shock by effectively deforming a corner portion when the member is crushed into a bellows shape at the time of a vehicle collision. With a hat member having a closed cross-sectional shape that is commonly used, only two corner portions of the side member can be effectively crushed, so that energy cannot be effectively absorbed. Therefore, in the present invention, the energy absorption due to the deformation of the four corners of the hat member is prevented by installing the reinforcing plate with the adhesive at the joint with the closing plate which has not effectively contributed to the energy absorption in the related art. It can be used effectively.

[0008]

EXAMPLES The present invention will now be described in more detail by way of examples, which should not be construed as limiting the invention.

Conventional Example 1 The structural member shown in FIG. 1 is a straight member having a hat cross section, which is made of a member formed of mild steel plate (t = 1.6 mm), and the side member 1 and the closing plate 2 are spotted. It is joined by the welded portion 3.

Embodiment 1 FIG. 2 shows a joined structural member of Embodiment 1 of the present invention. An adhesive joint portion 5 (adhesive used: T peel strength 1) in which a reinforcing plate 4 is also used for spot welding on the inner side of the side member 1 opposite to the closing plate 2 (back side of the side member 1).
88N-25mm). The pitch of the spot welding is approximately the same as the pitch of the spot welding portion 3 applied to the flange portion, and the middle of the welding portion 3 is spot welded. Others are exactly the same as the conventional example.

Embodiment 2 FIG. 3 shows a joint structure member of another embodiment 2. Reinforcement plate 4
(T = 0.8, 1.6 mm: Examples 2-1 and 2-2) are installed on the opposite side of Example 1, the closing plate 2
It is joined to the inner side of the side member 1 on the side of the joint portion with and through the adhesive joint portion 5 that also uses spot welding.

Comparative Examples 1 and 2 For comparison, FIGS. 4 and 5 show the bonded structural members of Comparative Examples 1 and 2, respectively. The same as in Examples 1 and 2 except that no adhesive was used.

Comparative Example 3 A bonded structural member was produced in exactly the same manner as in Example 1 except that the adhesive had a T peel strength of 167 N-25 mm.

Example 3 A bonded structural member was produced in exactly the same manner as in Example 1 except that the adhesive had a T peel strength of 176 N-25 mm.

Conventionally, when a reinforcing plate is installed on the hat member, it is usually installed on the back side of the side member 1 in order to perform spot welding by sandwiching the reinforcing plate from above and below with the tip of the gun of the spot welding machine.

As in Example 2 and Comparative Example 2, it was not easy to perform spot welding on the inside of the side member 1 on the joint side with the closing plate 2. In the present invention,
A reinforcing plate coated with an adhesive is fixed to the closing plate 2 by spot welding in advance, the closing plate 2 and the side member 1 are integrated at the spot welding portion 3, and then a conductive metal is formed in the closed cross-section space inside the member. A block was inserted, and spot welding was performed using a spot welding machine having the block and a conventional spot welding electrode as a pair of electrodes. Accordingly, the structure in which the reinforcing plate is installed on the closing plate side can be easily assembled.

When the reinforcing plate 4 with adhesive is fixed to the closing plate 2 in advance by the above steps, it may be positioned by a projection as shown in FIG.

Example 4 In Example 4, the reinforcing plate 4 of Example 2 is divided into two parts (t = 0.8, 1.6 mm: Examples 4-1 and 4-2).
It is. By installing the reinforcing plate only in the necessary portion, the weight increase can be further suppressed.

Table 1 shows the results of each Example and each Comparative Example.

[0020]

[Table 1]

First, Example 1 and Examples 2-1 and 2-
2. The results of Comparative Examples 1 and 2 will be described. FIG. 6 shows the amount of absorbed energy when a truck collision test was performed on each of the joint structure members. The trolley collision test is trolley weight 1690
It was carried out at kg and a trolley speed of 30 km / h. From the results of FIG. 6, it is understood that in order to obtain the amount of absorbed energy equivalent to that of Comparative Example 1, the weight increase of Example 1 is about 56% of that of Conventional Example 1. In addition, in Example 2, the weight increase is about 38%. However, in Comparative Example 2 as well, the same amount of absorbed energy can be obtained with the same increase in weight as in Example 1, but in terms of workability, Example 1 is simpler.

Next, the results of Examples 1 and 3 and Comparative Example 3 will be described. As shown in Table 1, changing the adhesive causes a difference in the energy absorption amount. The range of the adhesive effective in the present invention is 170 N in T peel strength.
-Mm or more, preferably 180 N-mm or more.

Further, the results of Examples 4-1 and 4-2 will be described. In Examples 4-1 and 4-2, the adhesive-bonded reinforcing plate of Examples 2-1 and 2-2 was basically used.
It is divided. As shown in Table 1, even when the adhesive-combined reinforcing plate is divided into two as in Example 4, there is almost no difference in absorbed energy. Therefore, the effect of the adhesive-combined reinforcing plate has conventionally effectively contributed to energy absorption. I know there isn't. Further, it can be seen that the deformation of the joint between the side member 1 and the closing plate 2 has an energy absorbing action. In Example 4, about 90% (748) compared to Example 2.
/811=0.92), the same energy absorption amount can be obtained with a weight increase of 35% as compared with Comparative Example 1.

In the present invention, it is also possible to use a rivet, a bolt, a mechanical clinch or projection welding instead of the spot welding portion.

[0025]

As described above, according to the present invention, the energy absorption characteristics of the vehicle body can be optimized and the productivity can be improved with a small weight increase.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a conventional closed-section structure hat member.

FIG. 2 is a configuration diagram of a first embodiment of the present invention.

FIG. 3 is a configuration diagram of a second embodiment of the present invention.

FIG. 4 is a configuration diagram of Comparative Example 1 of the present invention.

FIG. 5 is a configuration diagram of Comparative Example 2 of the present invention.

FIG. 6 is a positioning structure diagram for easily assembling the joining structure member of the present invention.

FIG. 7 is a diagram showing the results of collisions of trucks with energy absorption amounts according to Examples 1 and 2 of the present invention and Comparative Examples 1 and 2.

[Explanation of symbols]

 1 Side member 2 Closing plate 3 Spot welding part 4 Reinforcing plate 5 Adhesive joint part

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyuki Kaburagi 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (5)

[Claims] 1. A flange surface having a closed cross-section structure is joined by a spot joining method or a spot joining method using an adhesive,
A joint structure member in which a reinforcing plate is installed from the inside of a closed cross-section structure member, wherein an adhesive and a point joint method are used together for jointing the reinforcing plate. 2. A reinforcing plate is installed so as to straddle the abutting portions of two or more constituent members forming the closed cross-section structural member, and an adhesive and a point are used for joining the closed cross-section structural member. The joined structural member according to claim 1, which is used together with a joining method. 3. A concavo-convex portion for positioning is formed on both one or more constituent members forming the closed cross-section joint structural member and the reinforcing plate. The joined structural member according to 1 or 2. 4. The bonded structural member according to claim 1, wherein the T-peel strength after curing of the adhesive used for bonding the reinforcing plate is 170 N-25 mm or more. 5. The method for manufacturing a closed-section joined structural member according to claim 2 or 3, wherein in the step of assembling the closed-section joined structural member, before closing the closed section,
In advance, the reinforcing plate and one component forming the closed cross-section joining structural member are joined by spot welding together with an adhesive,
After that, the flange surface of the other component is joined by point joining or a point joining method in which an adhesive is used together to make a closed cross section, and then insert a conductive metal block into the closed cross section space inside the member, A spot welding machine using the block and a conventional spot welding electrode as a pair of electrodes is used to perform spot welding of the reinforcing plate and another structural member that is abutted against the structural member to which the reinforcing plate is previously joined. And a method for manufacturing a joined structural member.