KR102639710B1 - Multilaiered plates of heterogeneous material and joint method thereof - Google Patents

Abstract

The method for joining multiple plates of different types according to the present invention includes a welding joining step of spot welding a second plate made of steel below a first plate made of steel at a plurality of locations spaced apart from each other at a predetermined distance; And a mechanical joining step in which a third plate containing a lightweight material is joined to the lower part of the second plate by SPR bonding or clinching at a plurality of points, and the joining position is between two adjacent spot welding positions among the plurality of spot welding positions. Includes ;

Description

Heterogeneous multi-plate joint structure and manufacturing method {MULTILAIERED PLATES OF HETEROGENEOUS MATERIAL AND JOINT METHOD THEREOF}

The present invention relates to a heterogeneous multi-plate joint structure and a manufacturing method thereof, and more specifically, to a heterogeneous multi-plate joint structure for joining three or more heterogeneous plates and a manufacturing method thereof.

As exhaust gas regulations have recently been strengthened, the development of electric vehicles is accelerating. However, because the range of electric vehicles is determined by the capacity of the battery, the weight of batteries mounted on electric vehicles is gradually increasing.

However, as the weight of the battery increases, fuel efficiency decreases, so the need for lighter vehicles is gradually increasing so that fuel efficiency can be increased by reducing the overall weight of the vehicle even if the battery weight increases.

Accordingly, there is a trend to replace part of the vehicle's BIW (Body In White) with lightweight materials from steel plates. In order to maintain BIW rigidity while reducing weight, lightweight materials are used only in areas where the weight reduction effect is significant, and steel plates and lightweight materials are used together. Development of the multi material mix BIW used is in progress.

Accordingly, there is a need for a method for joining dissimilar materials that can effectively join steel plates and lightweight materials. In particular, when steel plates and lightweight materials are joined in three or more layers, a technology for robustly joining them is required.

The matters described as background technology above are only for the purpose of improving understanding of the background of the present invention, and should not be taken as recognition that they correspond to prior art already known to those skilled in the art.

KR 10-1525018 B1 (2015.06.02.)

The present invention was devised to solve this problem, and the purpose of the present invention is to provide a heterogeneous multi-plate bonding structure that can combine two or more steel plates and one or more lightweight plates and a manufacturing method thereof.

In order to achieve the above object, a method for joining multiple plates of different types according to an embodiment of the present invention includes a welding joining step of spot welding a second plate made of steel below a first plate made of steel at a plurality of locations spaced apart from each other at a predetermined distance; And a mechanical joining step in which a third plate containing a lightweight material is joined to the lower part of the second plate by SPR bonding or clinching at a plurality of points, and the joining position is between two adjacent spot welding positions among the plurality of spot welding positions. Includes ;

After the welding joining step is performed, in the mechanical joining step, the second and third plates can be joined by passing a rivet through the third plate and joining the second plate.

It further includes a preparation step of forming a plurality of through holes in the first plate before the welding and joining step, and in the mechanical joining step after the welding and joining step, the rivets are connected to the second plate through the through holes formed in the first plate. The second and third plates can be joined by inserting it into the second plate and joining it to the third plate.

It further includes a preparation step of forming a plurality of through holes in the first plate before the welding joining step, and in the mechanical joining step after the welding joining step is performed, the rivet is placed at a position corresponding to the position of the through hole formed in the first plate. The second and third plates can be joined by penetrating through the third plate and joining the second plate.

It further includes a preparation step of forming a plurality of through holes in the third plate before the mechanical joining step, and in the mechanical joining step, the second and third plates are connected to the third plate by passing a rivet through the second plate. In the welding joining step, one electrode is inserted through a through hole formed in the third plate to contact the second plate, and the other electrode is brought into contact with the first plate to connect the first and second plates. The first and second plates can be joined by spot welding.

After the welding joining step is performed, in the mechanical joining step, the second and third plates can be joined by clinching the first, second, and third plates so that they simultaneously protrude upward.

It further includes a preparation step of forming a plurality of through holes in the first plate before the welding joining step, and in the mechanical joining step after the welding joining step is performed, a punch is inserted through the through hole formed in the first plate to form a plurality of through holes in the first plate. The second and third plates can be joined by bringing them into contact with the second plate and clinching them so that the second and third plates simultaneously protrude downward.

It further includes a preparation step of forming a plurality of through holes in the first plate before the welding joining step, and in the mechanical joining step after the welding joining step is performed, the punch is placed at a position corresponding to the through hole formed in the first plate. The second plate and the third plate can be joined by contacting the third plate and clinching the second plate and the third plate so that the second plate and the third plate simultaneously protrude upward and the protrusion is accommodated in the through hole of the first plate.

It further includes a preparation step of forming a plurality of through holes in the third plate before the mechanical joining step, and in the mechanical joining step, the second plate and the third plate are clinched so that they simultaneously protrude downward. The three plates are joined, and in the welding joining step, one electrode is inserted through the through hole formed in the third plate and brought into contact with the second plate, and the other electrode is brought into contact with the first plate to connect the first plate and the second plate. The first and second plates can be joined by spot welding the plates.

Before the mechanical joining step, it further includes a laminating step of forming a third plate by laminating a lightweight plate made of a lightweight material containing at least one of magnesium and aluminum and a reinforcing plate made of steel, and in the mechanical joining step, the lightweight plate is formed. The back plate and reinforcement plate can be SPR bonded or clinched bonded to the second plate.

Meanwhile, the heterogeneous multi-plate bonding structure includes a first plate made of steel that is spot-welded to each other at a plurality of places; and 2nd edition; A third plate including a lightweight material that is SPR bonded or clinched at a plurality of places to the second plate; wherein the spot welding positions of the plurality of places where the first plate and the second plate are joined are spaced apart from each other at a predetermined distance. , the SPR joining or clinching joining position of the second and third plates is characterized in that it is formed between two spot welding positions adjacent to each other.

The rivet that joins the second and third plates to the SPR may penetrate the third plate and be coupled to the second plate.

A through hole is formed between a plurality of spot welding positions in the first plate, and the rivet for SPR joining the second and third plates is inserted into the second plate through the through hole of the first plate, It may penetrate and be coupled to the third plate.

A through hole is formed between a plurality of spot welding positions in the first plate, and the rivet that SPR joins the second and third plates penetrates the third plate at a position corresponding to the position where the through hole of the first plate was formed. By being coupled to the second plate, the protrusion of the SPR joint can be accommodated in the through hole of the first plate.

A through hole is formed in the third plate at a position corresponding to the spot welding position of the first and second plates, and the rivet that SPR joins the second and third plates penetrates the second plate and is connected to the third plate. It can be.

The first, second, and third plates protrude upward at corresponding positions so that the second and third plates can be clinched.

A through hole is formed between a plurality of spot welding positions in the first plate, and the corresponding positions of the second and third plates protrude upward or downward so that the second and third plates can be clinched. .

A through hole is formed in the third plate at a position corresponding to the spot welding position of the first and second plates, and the corresponding positions of the second and third plates protrude downward to form the second and third plates. Can be joined by clinching.

The third plate includes a lightweight plate made of a lightweight material containing at least one of magnesium and aluminum and a reinforcing plate made of steel, and may be prepared by laminating one lightweight plate with another lightweight plate or reinforcing plate.

According to the heterogeneous multi-plate bonding structure and manufacturing method according to the present invention, the following effects are achieved.

First, two or more steel plates and one or more lightweight plates can be easily combined.

Second, dissimilar materials can be combined in various ways depending on interference with surrounding parts or required physical properties.

1 to 6 are diagrams showing heterogeneous multi-plate bonding structures according to various embodiments of the present invention joined by the SPR bonding method,
Figures 7 to 9 are diagrams showing heterogeneous multi-plate joint structures according to various embodiments of the present invention joined by a clinching joining method.

The terminology used herein is only intended to refer to specific embodiments and is not intended to limit the invention. As used herein, singular forms include plural forms unless phrases clearly indicate the contrary. As used in the specification, the meaning of "comprising" is to specify a specific characteristic, area, integer, step, operation, element and/or component, and to specify another specific property, area, integer, step, operation, element, component and/or group. It does not exclude the existence or addition of .

Although not defined differently, all terms including technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries are further interpreted as having meanings consistent with related technical literature and currently disclosed content, and are not interpreted in ideal or very formal meanings unless defined.

Hereinafter, a heterogeneous multi-plate bonding structure and a manufacturing method thereof according to a preferred embodiment of the present invention will be described with reference to the attached drawings.

Figures 1 to 6 are diagrams showing heterogeneous multi-plate joint structures according to various embodiments of the present invention joined by the SPR joining method, and Figures 7 to 9 are diagrams showing various embodiments of the present invention joined by the clinching joining method. This is a diagram showing a heterogeneous multi-plate joint structure.

As shown in Figures 1 to 9, the heterogeneous multi-plate joining structure according to the present invention includes a welding joining step of spot welding the first plate 100 and the second plate 200, which are steel plates, and the second plate. It includes a mechanical joining step of joining the third plate 300 to (200) by SPR bonding or clinching joining method, and optionally, forming a through hole 110 in the first plate 100 or forming a through hole 110 in the third plate 100. A preparation step of forming a through hole 330 in (300) and a third plate ( 300) is manufactured through a manufacturing method that further includes one or more of the lamination steps to form.

At this time, in the welding joining step, a plurality of spot welding positions (W) for joining the first plate 100 and the second plate 200 are formed to be spaced apart from each other by a predetermined distance. The shape and spacing at which each spot welding position W is arranged is not particularly limited, but for example, it may be formed in a square lattice structure or a triangular or hexagonal honeycomb structure. At this time, the spacing between the spot welding positions (W) may be 20 to 60 mm apart, and preferably 30 to 40 mm apart.

If the spacing between the plurality of spot welding positions (W) is too close, a shunt effect may occur, and if the spacing is too far, the joint rigidity of the first plate 100 and the second plate 200 may be reduced. .

In the mechanical joining step, the SPR joining position (R) or clinching joining position (C) that joins the second plate 200 and the third plate 300 is formed between two adjacent spot welding positions (W). desirable. To be more specific, an SPR joint position (R) or a clinching joint position (C) is formed in the center of two spot welding positions (W) adjacent to each other, for example, the two spot welding positions (W) are separated by 30 mm from each other. When spaced apart, it is desirable to form the two spot welding positions (W) to be spaced approximately 15 mm apart.

If the gap between the SPR joining position (R) or clinching joining position (C) and the spot welding position (W) is too close, contact the correct position with an electrode or punch to perform spot welding or SPR/clinching joining. Because it is difficult to do, it may be difficult to perform SPR/clinching joining after performing spot welding, or performing spot welding after performing SPR/clinching joining.

In addition, the third plate 300 according to the present invention may be formed in a structure in which one or more plates are stacked, including at least one lightweight plate 310, and optionally additional lightweight plate 310 or reinforcement made of steel. It may further include a plate 320.

The lightweight plate 310 is made of an alloy of lightweight metal containing at least one of aluminum and magnesium, and the reinforcement plate 320 is made of the same or similar steel material as the first plate 100 and the second plate 200. It may be a steel plate. In the drawing attached to the present invention, it is shown that a third plate 300 is formed by stacking one lightweight plate 310 and one reinforcing plate 320, but the present invention is not limited thereto, and A third plate 300 is formed by stacking another lightweight plate 310 on the plate 310, or a third plate 300 is formed by laminating one reinforcing plate 320 on two lightweight plates 310. You might be able to do it.

The manufacturing method of the heterogeneous multi-plate bonded structure according to the present invention is largely divided into a method by SPR bonding and a method by clinching bonding, which each perform a welding bonding step first and then a mechanical bonding step, or a mechanical bonding step. After performing this, the welding joint step can be performed. Hereinafter, various embodiments according to the present invention will be described.

1. SPR bonding - first example

As shown in FIG. 1, in the first embodiment, the first plate 100 and the second plate 200 are first spot welded in a plurality of places through a welding joint step, and then a mechanical joint step is performed to attach the rivet to the third plate. By performing SPR bonding while penetrating from the lower surface of the plate 300 toward the second plate 200, the first plate 100 and the second plate 200 are joined by spot welding, and the second plate 200 and the second plate 200 are joined by spot welding. The third plate 300 is SPR bonded.

At this time, the spot welding position (W) and the SPR joining position (R) are alternately arranged up and down so that the SPR joining position (R) is located in the center between the two spot welding positions (W).

2. SPR Bonding - Second Example

As shown in FIG. 2, in the second embodiment, a preparation step of forming a plurality of through holes 110 in the first plate 100 is performed before performing the welding joining step, and the first plate 100 is formed through the welding joining step. After the first plate 100 and the second plate 200 are spot welded in multiple locations, a mechanical joining step is performed to attach the rivet to the upper surface of the second plate 200 through the through hole 110 of the first plate 100. By performing SPR bonding while penetrating in the direction from the third plate 300, the first plate 100 and the second plate 200 are joined by spot welding, and the second plate 200 and the third plate 300 are joined by spot welding. SPR bonded.

At this time, the through hole 110 formed in the first plate 100 is formed between the spot welding position W where the first plate 100 and the second plate 200 are spot welded, and is formed through the through hole. The SPR joint position (R) formed by the inserted rivet is formed in the central part between the two spot weld positions (W).

3. SPR Bonding - Third Example

As shown in FIG. 3, the third embodiment is the same as the second embodiment, performing a preparation step of forming a plurality of through holes 110 in the first plate 100 before performing the welding joining step. After spot welding the first plate 100 and the second plate 200 in a plurality of places through a welding joining step, a mechanical joining step is performed to attach rivets from the lower surface of the third plate 300 to the second plate 200. By performing SPR bonding while penetrating in one direction, the first plate 100 and the second plate 200 are spot welded and the second plate 200 and the third plate 300 are SPR bonded.

At this time, by inserting the rivet into the lower surface of the third plate 300 corresponding to the through hole 110 formed in the first plate 100, the SPR joint protrusion R1 formed by inserting the rivet is formed in the first plate 100. It is accommodated inside the through hole 110, so that after the first plate 100, second plate 200, and third plate 300 are combined, no separate protrusions are formed and a flat surface is displayed. there is. Since a flat surface can be formed after joining, interference with surrounding components can be minimized.

4. SPR bonding - Example 4

As shown in FIG. 4, the fourth embodiment performs a preparation step of forming a plurality of through holes 330 in the third plate 300 before performing the welding joining step, and rivets are formed through the mechanical joining step. After performing SPR bonding while penetrating from the upper surface of the second plate 200 in the direction of the third plate 300, a welding joint step is performed to connect the first plate 100 and the second plate 200 at a plurality of points. By welding, the first plate 100 and the second plate 200 are joined by spot welding, and the second plate 200 and the third plate 300 are SPR joined.

At this time, in the welding joining step, one electrode is inserted through the through hole 330 formed in the third plate 300 to contact the lower surface of the second plate 200, and the other electrode is inserted into the third plate 300. The first plate 100 and the second plate 200 are spot welded by contacting the upper surface of the first plate 100 at a position corresponding to the through hole 330 of .

5. Modifications of the first to fourth embodiments

In the first to fourth embodiments, the third plate 300 is composed of a single layer of the lightweight plate 310, but this third plate 300 includes the lightweight plate 310 and the reinforcement plate 320. It can be replaced with a two-layer structure.

Figure 5 shows the third plate 300 of the first embodiment replaced with a double layer, and Figure 6 shows the third plate 300 of the second embodiment replaced with a double layer, and Fig. 7 In the figure, the third plate 300 of the third embodiment is shown replaced with a double layer.

In this way, even when the third plate 300 is composed of multiple layers and multiple plates of 4 or more layers of different materials are joined, welding and SPR bonding can be performed in the same manner as the first to fourth embodiments described above. .

In addition, in the case of the first embodiment shown in FIG. 1, the rivet penetrates and joins the first plate 100 at the SPR joining position (R), but the first plate 100 and the second plate 200 are spot welded. This bonding structure is not essential because it is bonded through. Therefore, as shown in FIG. 5, when the third plate 300 is composed of multiple layers in the first embodiment, the rivets connect the reinforcement plate 320, the lightweight plate 310, and the second plate 200. It is okay even if it does not penetrate to the first plate 100.

6. Clinching joint - Example 5

As shown in FIG. 8, in the fifth embodiment, the first plate 100 and the second plate 200 are first spot-welded in multiple locations through a welding joining step, and then a mechanical joining step is performed to form a third plate ( The first plate 100, the second plate 200, and the third plate 300 are simultaneously clinched by pressing the lower surface of the plate 300 with a punch.

At this time, the spot welding position (W) and the clinching joining position (C) are alternately arranged up and down, so that the clinching joining position (C) is arranged in the center between the two spot welding positions (W).

7. Clinching joint - Example 6

As shown in FIG. 9, the sixth embodiment performs a preparation step of forming a plurality of through holes 110 in the first plate 100 before performing the welding joining step, and the first plate 100 is formed through the welding joining step. After spot welding the first plate 100 and the second plate 200 in multiple locations, a mechanical joining step is performed and the punch is inserted into the upper surface of the second plate 200 through the through hole 110 of the first plate 100. By contacting and pressurizing to perform clinching joining, the first plate 100 and the second plate 200 are joined by spot welding, and the second plate 200 and the third plate 300 are clinched joined. .

At this time, the through hole 110 formed in the first plate 100 is formed between the spot welding position W where the first plate 100 and the second plate 200 are spot welded, and is formed through the through hole. The SPR joint position (R) formed by the inserted rivet is formed in the central part between the two spot weld positions (W).

8. Clinching joint - Example 7

As shown in FIG. 10, the seventh embodiment performs a preparation step of forming a plurality of through holes 110 in the first plate 100 before performing the welding joining step, as in the sixth embodiment. , After spot welding the first plate 100 and the second plate 200 in multiple locations through the welding joining step,

By performing a mechanical joining step, bringing the punch into contact with the lower surface of the third plate 300, and then applying pressure to perform clinching joining, the first plate 100 and the second plate 200 are joined by spot welding, and the second plate 300 is joined by spot welding. The plate 200 and the third plate 300 are SPR bonded.

At this time, by bringing the punch into contact with the lower surface of the third plate 300 corresponding to the through hole 110 formed in the first plate 100, the clinching joint protrusion C1 formed at the clinching joint position C is formed. It is accommodated inside the through hole 110 of the first plate 100, and after the first plate 100, second plate 200, and third plate 300 are combined, no separate protrusions are formed and it is flat. It can be made to represent the surface. Since a flat surface can be formed after joining, interference with surrounding components can be minimized.

9. Clinching joint - Example 8

As shown in FIG. 11, the eighth embodiment performs a preparatory step of forming a plurality of through holes 330 in the third plate 300 before performing the welding joining step, and punches through the mechanical joining step. After clinching the second plate 200 and the third plate 300 by pressing and contacting the upper surface of the second plate 200, a welding joining step is performed to bond the first plate 100 and the second plate 100 to the upper surface of the second plate 200. By spot welding 200 at multiple locations, the first plate 100 and the second plate 200 are spot welded, and the second plate 200 and the third plate 300 are clinched.

At this time, in the welding joining step, one electrode is inserted through the through hole 330 formed in the third plate 300 to contact the lower surface of the second plate 200, and the other electrode is inserted into the third plate 300. The first plate 100 and the second plate 200 are spot welded by contacting the upper surface of the first plate 100 at a position corresponding to the through hole 330 of .

10. Modifications of Embodiments 5 to 8

In the fifth to eighth embodiments, the third plate 300 is composed of a single layer of the lightweight plate 310, but this third plate 300 includes the lightweight plate 310 and the reinforcement plate 320. It can be replaced with a two-layer structure.

Figure 12 shows the third plate 300 of the sixth embodiment replaced with a double layer, and Figure 13 shows the third plate 300 of the seventh embodiment replaced with a double layer.

Even when the third plate 300 is composed of multiple layers and multiple plates of 4 or more layers of different materials are joined, welding and clinching can be performed in the same manner as the fifth to eighth embodiments described above. there is.

However, since it is not easy to perform clinching joining by stacking four or more sheets due to the nature of the construction method, it would be preferable to perform clinching joining only on structures in which up to three sheets are stacked.

When using the heterogeneous multi-plate bonding structure manufactured according to various embodiments of the present invention, a plurality of plates having different materials can be stacked and joined, so that the vehicle's By replacing some of the BIW with lightweight plates, it is possible to achieve lighter vehicles.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical idea or essential features. You will be able to understand it.

Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

100: first plate 110: through hole of first plate
200: 2nd edition 300: 3rd edition
310: lightweight board 320: reinforcement plate
330: Through hole of third plate R: SPR joint position
R1: SPR joint projection C: Clinching joint location
C1: Clinching joint protrusion W: Spot welding position

Claims (19)

A welding joining step of spot welding a second plate made of steel to the lower part of the first plate made of steel at a plurality of locations spaced apart from each other at a predetermined distance; and
A mechanical joining step of SPR joining or clinching a third plate containing a lightweight material below the second plate at a plurality of locations, where the joint location is between two adjacent spot welding locations among the plurality of spot welding locations; Including,
It further includes a preparation step of forming a plurality of through holes in the third plate before the mechanical joining step,
In the mechanical joining step, the second and third plates are joined by passing a rivet through the second plate and joining the third plate,
In the welding joining step, one electrode is inserted through a through hole formed in the third plate and brought into contact with the second plate, and the other electrode is brought into contact with the first plate to spot weld the first and second plates. A heterogeneous multi-plate joining method characterized by combining the first plate and the second plate.
delete delete delete delete delete delete delete A welding joining step of spot welding a second plate made of steel to the lower part of the first plate made of steel at a plurality of locations spaced apart from each other at a predetermined distance; and
A mechanical joining step of SPR joining or clinching a third plate containing a lightweight material below the second plate at a plurality of locations, where the joint location is between two adjacent spot welding locations among the plurality of spot welding locations; Including,
It further includes a preparation step of forming a plurality of through holes in the third plate before the mechanical joining step,
In the mechanical joining step, the second and third plates are joined by clinching so that the second and third plates simultaneously protrude downward,
In the welding joining step, one electrode is inserted through a through hole formed in the third plate and brought into contact with the second plate, and the other electrode is brought into contact with the first plate to spot weld the first and second plates. A heterogeneous multi-plate joining method characterized by combining the first plate and the second plate.
The method of claim 1 or 9,
Before the mechanical joining step, heterogeneous multi-plate bonding further includes a laminating step of forming a third plate by laminating a lightweight plate made of a lightweight material containing at least one of magnesium and aluminum and a reinforcing plate made of steel. method.
A first plate made of steel and spot welded to each other in multiple places; and 2nd edition;
It includes a third plate including a lightweight material that is SPR bonded or clinched at multiple locations to the second plate,
The plurality of spot welding positions of the first and second plates are spaced apart from each other by a predetermined distance, and the SPR joining or clinching joint positions of the second and third plates are formed between two adjacent spot welding positions. And
A through hole is formed in the third plate at a position corresponding to the spot welding position of the first and second plates,
A heterogeneous multi-plate joint structure characterized in that the rivet for SPR joining the second and third plates penetrates the second plate and is coupled to the third plate.
delete delete delete delete delete delete A first plate made of steel and spot welded to each other in multiple places; and 2nd edition;
It includes a third plate including a lightweight material that is SPR bonded or clinched at multiple locations to the second plate,
The plurality of spot welding positions of the first and second plates are spaced apart from each other by a predetermined distance, and the SPR joining or clinching joint positions of the second and third plates are formed between two adjacent spot welding positions. And
A through hole is formed in the third plate at a position corresponding to the spot welding position of the first and second plates,
A heterogeneous multi-plate joint structure characterized in that the second and third plates are clinched jointed with corresponding positions protruding downward.
The method of claim 11 or 18,
The third plate includes a light plate made of a lightweight material containing at least one of magnesium and aluminum and a reinforcing plate made of steel, and is prepared by laminating another lightweight plate or reinforcing plate on one lightweight plate. Heterogeneous multi-plate joint structure.

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