KR20230091625A - Method for spot welding laminated composite panel - Google Patents

Abstract

A spot welding method of a laminated composite panel according to the present invention comprises: a bending step in which a laminated composite panel made of a first metal material, a second metal material, and a non-metallic material disposed between the first metal material and the second metal material is bent and deformed so that the first metal material is bent toward the second metal material; a first contact step of bringing the first metal material of the laminated composite panel into contact with one surface of a first metal panel; and a first welding step of spot welding the laminated composite panel and the first metal panel by contacting and pressing a welding electrode on an exposed surface of the first metal material bent toward the second metal material and the other surface of the first metal panel, respectively, thereby capable of bonding the laminated composite panel to a metal panel without any additional processes such as removing non-metallic layers or inserting metal pieces.

Description

Spot welding method of laminated composite panel {METHOD FOR SPOT WELDING LAMINATED COMPOSITE PANEL}

The present invention relates to a method for spot welding a laminated composite panel, in which a laminated composite panel and a metal panel are spot-welded.

In constituting the vehicle structure, panel parts are applied to separate the vehicle and external space and configure the vehicle shape.

In order to satisfy various performance conditions such as stiffness, strength, durability, and crash safety in a typical vehicle, various materials are applied to individual parts to form the body structure.

At this time, in order to make the vehicle light, the vehicle body structure is made of parts applied with very strong materials, lightweight metal materials with low density such as aluminum or magnesium, plastics or plastic composite materials mixed with reinforcing materials.

Compared to parts made of only a single metal, parts made of laminated composite panels in which non-metallic thin plates such as metal and plastic are laminated have the advantage of being able to make lightweight parts because non-metallic thin plates such as plastic with low density are laminated.

However, since the non-metallic sheet such as plastic laminated on the laminated composite panel is an electrical insulator, it has a disadvantage that electric resistance welding, which is generally applied to automobile assembly processes, is impossible.

In order to solve this problem, a part of the non-metallic thin plate such as plastic is removed and only the thin metal plate layer is in contact with the welding partner material to weld, or a method of welding by installing a separate energized line mechanically in the welding equipment, removing a part of the laminated composite panel A method of welding a separate single metal piece inserted and inserted with a welded object is being used.

However, the above-listed technologies require the introduction of separate additional processes, such as a process for physically removing a non-metal layer that is not exposed to the outside so that the surface metal layer does not disappear and a process for inserting a metal piece, or use only specially designed tools. Therefore, it has the disadvantage of requiring additional equipment investment.

Therefore, in order to solve these disadvantages, there is a need for a bonding method that can utilize general spot welding equipment that has already been invested and utilized in automobile factories without change and does not require additional processes such as removing a non-metal layer or inserting a metal piece.

Republic of Korea Patent Publication No. 10-2016-0105889

The present invention has been devised to solve the above problems, and provides a method of spot welding a laminated composite panel for bonding a laminated composite panel to a metal panel without additional additional processes such as removing a non-metal layer or inserting a metal piece. It has a purpose.

In order to achieve the above object, the spot welding method of a laminate composite panel according to the present invention is laminated with a first metal material, a second metal material, and a non-metal material disposed between the first metal material and the second metal material. a bending step of bending the laminated composite panel so that the first metal material is bent toward the second metal material; a first contact step of bringing the first metal material of the laminated composite panel into contact with one surface of the first metal panel; And a first welding method for spot welding the laminated composite panel and the first metal panel by contacting and pressing a welding electrode to the exposed surface of the first metal material bent toward the second metal material and the other surface of the first metal panel, respectively. step; includes.

Here, the bending step may include a cutting process of cutting a portion of the laminated composite panel in a state connected to the remaining portion; and a bending process of bending a portion of the laminated composite panel cut in the cutting process.

In this case, the cutting process may be performed by punching or notching the laminated composite panel.

In addition, in the bending process, a portion of the cut laminated composite panel may be bent and deformed so that the second metal material is folded and overlapped.

The bending step, as another embodiment, may include a bending step of bending and deforming one end of the laminated composite panel so that the second metal material is folded and overlapped.

In this case, the bending step may further include a cutting step of cutting a portion of the laminated composite panel to be separated from the remaining portion.

Meanwhile, the present invention provides a second contact step of bringing one surface of the second metal panel into contact with the other surface of the first metal panel; and pressing a welding electrode into contact with one surface of the first metal panel and the other surface of the second metal panel exposed through the cutting hole of the laminated composite panel formed by the cutting in the cutting process to press the welding electrode into contact with each other. and a second welding step of spot welding the second metal panel.

In the spot welding method of a laminated composite panel according to the present invention, a bending step of bending and deforming a laminated composite panel is configured so that a first metal material is bent toward a second metal material, that is, the second metal material is folded and overlapped. As the conductive route is formed along the metal material and the laminated composite panel can be spot-welded with the first metal panel, the bonding between the laminated composite panel and the first metal panel can be performed by removing the non-metallic material (non-metal layer) or inserting an additional metal piece. Without a separate process such as, it has an effect that can be implemented smoothly and easily with only general equipment (eg, a welding electrode).

In addition, the present invention can spot-weld the first metal panel (on one side of which the laminated composite panel is bonded) and the second metal panel in contact with the other side thereof through the cutting hole of the laminated composite panel formed by the cutting process of the bending step. Accordingly, the bonding of the first metal panel and the second metal panel to which the laminated composite panel is bonded can be performed using general equipment (eg, a welding electrode) without a separate process such as removal of a non-metal material (non-metal layer) or insertion of an additional metal piece. It has the advantage of being smooth and easy to implement.

1 is a flowchart showing a method of spot welding a laminated composite panel according to the present invention.
FIG. 2 is an example of the bending step of FIG. 1, showing that the cut portions of the laminated composite panel are bent toward each other.
FIG. 3 is an example of the bending step of FIG. 1, showing that the cut portions of the laminated composite panel are bent toward each other.
FIG. 4 is a view showing that one end portion of the laminated composite panel that is not cut is bent as another embodiment of the bending step of FIG. 1 .
5 is a cross-sectional view taken along lines A and B in the laminated composite panel in FIGS. 2 to 4;
6 is a view showing the structure of a vehicle roof assembly to which the present invention is applied.
7 is an exploded perspective view showing the roof assembly of FIG. 6;
8 is a cross-sectional view taken along line C of FIG. 6 .
9 is a cross-sectional view along line D of FIG. 6 .
10 and 11 are views showing various types of roof beams (laminated composite panels) to which the present invention is applied in the roof assembly of FIG. 7 .

Hereinafter, preferred embodiments will be described in detail so that those skilled in the art can easily practice the present invention with reference to the accompanying drawings. However, in describing a preferred embodiment of the present invention in detail, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the same reference numerals are used throughout the drawings for parts having similar functions and actions. In addition, in the present specification, terms such as 'upper', 'upper', 'top', 'lower', 'lower', 'lower', 'side' are based on the drawings, and components are actually arranged It may vary depending on which direction it is going.

In addition, throughout the specification, when a part is said to be 'connected' to another part, it is not only 'directly connected', but also 'indirectly connected' with other components in between. Also includes In addition, 'including' a certain component means that other components may be further included, rather than excluding other components unless otherwise stated.

1 is a flowchart showing a method of spot welding a laminated composite panel according to the present invention.

In addition, FIG. 2 is a view showing that the cut portions of the laminated composite panel are bent toward each other as an example of the bending step of FIG. 1, and FIG. 3 is an example of the bending step of FIG. 1, showing the laminated composite panel. It is a view showing that the cut portions of are bent towards each other, and FIG. 4 is a view showing that one end of the laminated composite panel is bent as another embodiment of the bending step of FIG. 1 .

In addition, FIG. 5 is a cross-sectional view along lines A and B in the laminated composite panel in FIGS. 2 to 4 .

Referring to FIG. 1 , the spot welding method of the laminated composite panel according to the present invention includes a bending step (S100), a first contact step (S200), and a first welding step (S300).

First, the bending step (S100) is a step of bending the laminated composite panel 100 as shown in FIGS. 2 to 4 .

In this case, the laminated composite panel 100 is formed by laminating a first metal material 110 , a non-metal material 120 , and a second metal material 130 . That is, the non-metallic material 120 is disposed between the first metallic material 110 and the second metallic material 130 .

The laminated composite panel 100 is subjected to bending deformation in the bending step (S100), such that the first metal material 110 is bent toward the second metal material 130.

In other words, in the bending step (S100), the laminated composite panel 100 is bent in a direction in which the first metal material 110 of the laminated composite panel 100 is bent toward the second metal material 130.

Specifically, the bending step (S100) may include a cutting step (S110) and a bending step (S120) as shown in FIG.

Here, the bending step (S100) may be configured to sequentially proceed with the cutting process (S110) and the bending process (S120) as an embodiment.

In the cutting process (S110), as shown in FIGS. 2 and 3, a portion 100a of the laminated composite panel 100 is cut.

At this time, a portion 100a of the laminated composite panel 100 is cut while being connected to the remaining portion.

That is, when cutting the part 100a of the laminated composite panel 100, the cutting line becomes a closed structure and is not cut to be separated from the rest, but the cutting line becomes an open structure so that the state connected to the rest can be maintained .

This cutting process (S110) may be performed by punching or notching the laminated composite panel 100.

In addition, in the bending process (S120), a portion (100a) of the laminated composite panel 100 cut in the cutting process (S110) is bent and deformed.

That is, the cut portion 100a of the laminated composite panel 100 is bent and deformed so that the second metal material 130 is folded and overlapped.

In other words, in the bending process (S120), the cut portion 100a of the laminated composite panel 100 is bent and deformed in a structure in which the second metal material 130 of the laminated composite panel 100 is folded and overlapped.

The present invention can smoothly perform the first welding step (S300) through the above-described bending step (S100).

Specifically, in the first welding step (S300) of welding the laminated composite panel 100 and the first metal panel 200 with a welding electrode, the laminated composite panel 100 is bent, as shown in FIG. 5(b). When not deformed, the upper surface of the first metal material 110 is formed by the non-metal material 120 disposed between the first metal material 110 and the second metal material 130 in the laminated composite panel 100. Since the upper welding electrode E in pressure contact and the lower welding electrode E in pressure contact with the lower surface of the first metal panel 200 do not conduct electricity, electric resistance welding cannot be performed.

However, in the present invention, as shown in FIG. 5 (a) in the bending step (S100), the first metal material 110 is bent toward the second metal material 130, that is, the second metal material 130 is folded. By bending and deforming the laminated composite panel 100 so as to overlap, as the contact surface of the first metal material 110 in contact with the first metal panel 200 is bent to become an exposed surface 110a exposed to the outside, upper welding When the electrode E is in press-contact with the exposed surface 110a of the first metal material 110, electricity is transmitted along the first metal material 110 and conducts electricity with the lower welding electrode E. Resistance welding is performed.

Furthermore, in the present invention, the cutting hole 100c of the laminated composite panel 100 is formed by cutting in the cutting process S110, so that the first metal panel 200 and the second metal panel 200 in contact therewith are formed through the cutting hole 100c. A second welding step (S500) of spot welding a metal panel (not shown) through electric resistance welding may be implemented.

Meanwhile, in the bending step (S100), as another embodiment, the cutting step (S110) and the bending step (S120) may be independently performed.

Specifically, the bending step (S100) may include a bending step (S120).

In the bending process (S120), as shown in FIG. 4, one end portion 100b of the laminated composite panel 100 is bent and deformed so that the second metal material 130 is folded and overlapped.

That is, in one embodiment of FIGS. 2 and 3 described above, a portion 100a of the laminated composite panel 100 is cut and the cut portion 100a is bent, whereas in the other embodiment of FIG. 4, without cutting One end (100b) located on the edge of the laminated composite panel 100, which is not an unbendable inner portion, is bent and deformed. In other words, one end portion 100b of the laminated composite panel 100 is directly bent without cutting as it can be bent without cutting.

By such a bending process (S120), as described above, the first welding step (S300) of spot welding the laminated composite panel 100 and the first metal panel 200 through electric resistance welding may be performed.

For reference, one end portion 100b of the laminated composite panel 100 may be formed in a protruding form at one side during panel manufacturing.

And, the bending step (S100) may further include a cutting step (S110).

In this cutting process (S110), a portion 100a of the laminated composite panel 100 is cut. As shown in FIG. 4, the portion 100a of the laminated composite panel 100 is cut to be separated from the rest.

That is, when cutting the portion 100a of the laminated composite panel 100, the cutting line becomes a closed structure and is cut so as to be separated from the rest.

This cutting process (S110) may be performed by punching the laminated composite panel 100.

The second welding step (S500) as described above may be performed by such a cutting process (S110). That is, in the cutting process (S110), a second welding step (S500) of spot welding the first metal panel 200 and the second metal panel in contact therewith through electric resistance welding may be performed.

Then, the above-mentioned first welding step (S300) and second welding step (S500) will be described in detail together with the first contact step (S200) and the second contact step (S400).

First, after the bending step (S100) of bending and deforming the laminated composite panel 100, the first contact step (S200) and the first welding step of spot welding the laminated composite panel 100 with the first metal panel 200 Looking at (S300) in detail, it is as follows.

In the first contact step (S200), the first metal material 110 of the laminated composite panel 100 is brought into contact with one surface 200a of the first metal panel 200.

As an example, as shown in FIG. 5(a) , in the first contact step (S200), the first metal material 110 may be brought into contact with the upper surface, which is one surface 200a, of the first metal panel 200.

In addition, in the first welding step (S300), the exposed surface 110a of the first metal material 110 bent toward the second metal material 130 and the other surface 200b of the first metal panel 200, respectively The welding electrode is contacted and pressed to spot weld the laminated composite panel 100 and the first metal panel 200 to each other.

Then, after the first contact step (S200) and the first welding step (S300) of welding the laminate composite panel 100 and the first metal panel 200, the first metal panel 200 and the second metal A second contact step (S400) and a second welding step (S500) of spot welding the panel may proceed.

That is, the present invention may further include a second contacting step (S400) and a second welding step (S500).

First, in the second contact step (S400), although not shown in the drawing, one surface of the second metal panel (not shown) is brought into contact with the other surface 200b (lower surface on the drawing) of the first metal panel 200. .

In addition, in the second welding step (S500), one surface (200a) of the first metal panel 200 exposed through the cutting hole (100c) of the laminated composite panel 100 formed by cutting in the cutting process (S110), The first metal panel 200 and the second metal panel are spot-welded by contacting and pressing the welding electrode to the other surface of the second metal panel.

6 is a view showing the structure of a roof assembly for a vehicle to which the present invention is applied, FIG. 7 is an exploded perspective view showing the roof assembly of FIG. 6, FIG. 8 is a cross-sectional view taken along line C in FIG. 6, and FIG. It is a cross section along line D.

10 and 11 are views showing various types of roof beams (laminated composite panels) to which the present invention is applied in the roof assembly of FIG. 7 .

Referring to the drawings, the roof assembly 10 disposed on the top of the vehicle has a structure as shown in FIG. 6, and as shown in FIG. 7, the roof member 11, the roof rail 12, the roof beam ( 13), and a mastic sealer 14.

That is, in the roof assembly 10, the roof member 11 is disposed on the upper side, and the roof rails 12 are disposed on both sides of the roof member 11 in the longitudinal direction of the vehicle. In addition, a loop beam 13 formed to substantially correspond to the width of the loop member 11 is disposed below the loop member 11, and a mastic sealer 14 is disposed between the loop beam 13 and the loop member 11. are placed

As shown in FIG. 8, such a roof assembly 10 is coupled by inserting a roof rail 12 between the roof member 11 and the roof beam 13 at the side. At this time, the roof beam 13 corresponds to the aforementioned laminated composite panel 100, the roof rail 12 corresponds to the first metal panel 200, and the roof member 11 corresponds to the second metal panel. there is.

Specifically, as shown in FIG. 9, by cutting and bending a portion 13a of the end of the roof beam 13 (laminated composite panel), the loop beam 13 (laminated composite panel) is formed by the upper roof rail 12 ) (first metal panel) and can be spot-welded by the welding electrode, and in addition, through the cutting hole 13c of the roof beam 13 (laminated composite panel) formed by cutting a portion 13a, the roof rail 12 The (first metal panel) and the upper loop member 11 (second metal panel) may be spot welded by a welding electrode.

On the other hand, as shown in FIGS. 10 and 11, in the loop beam 13 (laminated composite panel), the cutting and bending structure of FIGS. 2 and 3 is applied to the flange portion, so that a portion 13a is bent and the cutting hole ( 13c) may be formed, and the cutting and bending structure of FIG. 4 may be applied so that one end portion 13b may be bent and a cutting hole 13c may be formed.

As a result, in the spot welding method of the laminated composite panel according to the present invention, the first metal material 110 is bent toward the second metal material 130, that is, the second metal material 130 is folded and overlapped. By configuring the bending step (S100) of bending deformation of (100), an energization route is formed along the first metal material 110, so that the laminated composite panel 100 can be spot-welded with the first metal panel 200. Accordingly, the bonding of the laminated composite panel 100 and the first metal panel 200 is performed without a separate process such as removal of the non-metallic material 120 (non-metal layer) or insertion of an additional metal piece, using general equipment (as an example, a welding electrode) It can be implemented smoothly and easily.

And, the present invention through the cutting hole (100c) of the laminated composite panel 100 formed by the cutting process (S110) of the bending step (S100), the first metal panel 200 (one side (200a)) laminated composite panel As (100) is bonded) and the second metal panel in contact with the other surface (200b) thereof can be spot-welded, the laminate composite panel 100 is bonded to the first metal panel 200 and the second metal panel. The bonding can be smoothly and easily implemented with only general equipment (eg, a welding electrode) without a separate process such as removal of the non-metal material 120 (non-metal layer) or insertion of an additional metal piece. At this time, since cutting or bending can be implemented in the product molding process without a separate additional processing step as it is also performed with a general cutting machine and press machine, it is of course not to impede productivity.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains will realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. You will understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: roof assembly 11: roof member
12: roof rail 13: roof beam
13a: (of roof beam) part 13b: (of roof beam) cutting hole
14: mastic sealer E: welding electrode
100: laminated composite panel 100a: part (of laminated composite panel)
100b: one end (of laminated composite panel) 100c: cutting hole (of laminated composite panel)
110: first metal material 110a: exposed surface (of the first metal material)
120: non-metal material 130: second metal material
200: first metal panel 200a: one side (of the first metal panel)
200b: (of the first metal panel) other side
S100: Bending step S110: Cutting process
S120: Bending process S200: first contact step
S300: first welding step S400: second contact step
S500: 2nd welding step

Claims (7)

A laminated composite panel laminated with a first metal material, a second metal material, and a non-metal material disposed between the first metal material and the second metal material is bent so that the first metal material is bent toward the second metal material. Bending step to deform;
a first contact step of bringing the first metal material of the laminated composite panel into contact with one surface of the first metal panel; and
A first welding step of spot-welding the laminated composite panel and the first metal panel by contacting and pressing a welding electrode to the exposed surface of the first metal material bent toward the second metal material and the other surface of the first metal panel, respectively. ;
Spot welding method of a laminated composite panel comprising a.
According to claim 1,
The bending step is
a cutting process of cutting a portion of the laminated composite panel while being connected to the remaining portion; and
a bending process of bending a portion of the laminated composite panel cut in the cutting process;
Spot welding method of a laminated composite panel comprising a.
According to claim 2,
The cutting process is a method of spot welding a laminated composite panel formed by punching or notching the laminated composite panel.
According to claim 2,
The bending process is a method of spot welding a laminated composite panel in which a portion of the cut laminated composite panel is bent and deformed so that the second metal material is folded and overlapped.
According to claim 1,
The bending step is
a bending process of bending and deforming one end of the laminated composite panel so that the second metal material is folded and overlapped;
Spot welding method of a laminated composite panel comprising a.
According to claim 5,
The bending step is
a cutting process of cutting a portion of the laminated composite panel to be separated from the rest;
Spot welding method of the laminated composite panel further comprising a.
According to claim 2 or 5,
a second contact step of bringing one surface of the second metal panel into contact with the other surface of the first metal panel; and
A welding electrode is pressed into contact with one surface of the first metal panel and the other surface of the second metal panel exposed through the cutting hole of the laminated composite panel formed by the cutting in the cutting process, so that the first metal panel and A second welding step of spot welding the second metal panel;
Spot welding method of the laminated composite panel further comprising a.

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