KR102225490B1 - Multi material patchwork and manufacturing method thereof - Google Patents

Abstract

The method of manufacturing a patchwork of dissimilar materials according to the present invention comprises: a lamination step of laminating a high-rigidity non-ferrous material on a ferrous material to form a laminate; An assembly step of assembling the ferrous material and the non-ferrous material by clinching the laminate before molding the laminate; And a coating step of applying a power saving material to the seating surface of the ferrous material on which the non-ferrous material is seated, prior to the laminating step.

Description

Dissimilar material patchwork and its manufacturing method {MULTI MATERIAL PATCHWORK AND MANUFACTURING METHOD THEREOF}

The present invention relates to a dissimilar material patchwork and a method for manufacturing the same, and to a dissimilar material patchwork in which dissimilar materials are assembled and a method of manufacturing the same.

In recent years, the production of eco-friendly electric vehicles is increasing due to the strengthening of fuel economy regulations and environmental regulations for automobile body parts.

In addition, in order to improve fuel efficiency and secure collision stiffness due to an increase in the weight of an electric vehicle battery, the existing steel material is changed to a high-rigidity aluminum material to reduce weight, thereby realizing weight reduction.

In addition, in order to assemble the vehicle body parts, there is a trend of assembling the body parts by an assembly method such as aluminum welding, heterojunction, or welding using a laser instead of resistance welding of steel materials.

On the other hand, in order to form an aluminum material into a vehicle body part, a molding method using a press is applied, but the high rigidity aluminum material is difficult to form with a conventional molding method for molding with a deep molding depth and a complex shape due to the decrease in elongation due to the material properties. .

These high-rigidity aluminum materials are a problem that increases the cost of manufacturing vehicles due to the increase in raw material costs due to the application of expensive material costs compared to conventional steel materials, the application of the hot forming press method, and the increase in assembly costs due to the difficulty in assembling high-stiffness aluminum materials. There is a hindrance in its application to vehicle body parts.

Korean Registered Patent Publication No. 10-1825660

The present invention has been invented to solve the above problems, and an object of the present invention is to provide a patchwork of heterogeneous materials in which a high-rigidity aluminum material is firmly assembled to a steel material, and a method of manufacturing the same.

Dissimilar material patchwork according to an embodiment of the present invention in order to achieve the above object, iron material; And a laminate made of a high rigidity non-ferrous material laminated on the ferrous material, wherein the laminate is clinched to assemble the ferrous material and the non-ferrous material, and a power saving material is disposed between the ferrous material and the non-ferrous material. .

Here, the assembly portion, which is a portion to be clinched in the laminate, may be partially heated and clinched.

In addition, clinching may be performed in opposite directions at the same time in portions adjacent to each other in the assembly portion.

In addition, the power saving material may be a structural adhesive.

Further, in the present invention, the clinched laminate may be entirely heated and press-molded.

On the other hand, according to another aspect of the present invention, a method for manufacturing a patchwork of dissimilar materials comprises: a laminating step of laminating a high-rigidity non-ferrous material on a ferrous material to form a laminate; An assembly step of assembling the ferrous material and the non-ferrous material by clinching the laminate before molding the laminate; And before the laminating step, a coating step of applying a power saving material to the seating surface of the ferrous material on which the non-ferrous material is seated; a method of manufacturing a patchwork of heterogeneous materials comprising a.

Here, the assembling step may include a partial heating step of partially heating an assembly portion, which is a portion to be clinched in the laminate; And a clinching step of clinching the assembled portion of the laminate.

In addition, in the clinching process, one-way pressing for pressing the laminate from the non-ferrous material side and pressing in the other direction pressing on the ferrous material side are simultaneously performed at portions adjacent to each other of the assembling unit to press the assembly in both directions. can do.

In addition, in the applying step, a structural adhesive is used as the power saving material, and the structural adhesive may be applied to the seating surface of the iron material.

Furthermore, the present invention further includes a molding step of press-forming the laminate assembled in the assembling step, wherein the molding step includes: an overall heating process of heating the laminate as a whole; And a molding process of simultaneously forming the ferrous material and the non-ferrous material by press-forming the fully heated laminate.

The dissimilar material patchwork and its manufacturing method according to the present invention, by assembling two dissimilar materials by clinching, and applying a structural adhesive, which is a power saving material, to the seating surface of the ferrous material on which the aluminum material (non-ferrous material) is seated before assembly. , It has the effect that dissimilar materials can be firmly assembled while preventing corrosion of the potential difference between different materials, that is, between iron materials and aluminum materials.

Furthermore, the present invention has the advantage of assembling two dissimilar materials by assembling the two dissimilar materials in a two-way clinching to pressurize the assembly in both directions when assembling the two dissimilar materials.

1 is a view showing that a patchwork of different materials according to the prior art is molded.
2 is a view showing that the patchwork of different materials according to the present invention is molded.
3 is a view showing a method of manufacturing the dissimilar material patchwork of FIG. 2.
FIG. 4 is a view showing molding a patchwork of different materials manufactured by the manufacturing method of FIG. 3.
5 is a view showing in detail a method of manufacturing a patchwork of different materials in the flowchart of FIG. 3.
6 is a flowchart showing a method of manufacturing the patchwork of different materials of FIG. 5.
7 is a view showing that the patchwork of dissimilar materials according to the present invention is assembled by a two-way pressure clinching process.

Hereinafter, it will be described in detail through exemplary drawings of the present invention. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same reference numerals as much as possible, even if they are indicated on different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

FIG. 2 is a view showing that the patchwork of different materials according to the present invention is molded, FIG. 3 is a view showing a method of manufacturing the patchwork of different materials of FIG. 2, and FIG. 4 is It is a diagram showing the molding of a patchwork of different materials.

In addition, FIG. 5 is a diagram illustrating a method of manufacturing a different material patchwork in the flowchart of FIG. 3, and FIG. 6 is a flowchart illustrating a method of manufacturing a different material patchwork of FIG. 5.

Referring to the drawings, a method of manufacturing a patchwork of different materials according to the present invention includes a lamination step (S120), an assembly step (S130), and an application step (S110). For reference, in this patent specification, an aluminum material 2 will be described as an example as a non-ferrous material. In addition, in the entire drawing of the present patent specification, portions in which the brightness of each member such as the assembly portion 11, the insertion portion 12, etc. is changed to darken indicates a heated state, and the brightness is changed so that it does not become dark again. Indicates the state.

First, the lamination step (S120) is a step of laminating a high-rigidity aluminum material (2), which is a non-ferrous material, on a ferrous material (1) to form a laminate (10).

Accordingly, the dissimilar material patchwork (B) according to the present invention is made of a laminate 10 in which a high rigidity non-ferrous material 2 is stacked on a ferrous material 1.

In addition, the assembling step (S130) is a step of assembling the aluminum material 2 by clinching the laminate 10.

In addition, the coating step (S110) is a step of applying a power saving material to the seating surface of the iron material (1) on which the aluminum material (2) is seated before the lamination step (S120).

That is, according to the method of manufacturing a patchwork of dissimilar materials of the present invention, the application step (S110), the lamination step (S120), and the assembly step (S130) are sequentially performed, so that two materials having different materials are assembled to be dissimilar. The material patchwork (B) is produced.

Due to this, in the patchwork of dissimilar materials (B) according to the present invention, the laminate 10 is clinched to assemble the ferrous material 1 and the non-ferrous material 2, and the ferrous material 1 and the non-ferrous material 2 It takes a structure in which a power saving material is disposed between.

However, in the conventional patchwork manufacturing technology, two iron materials are assembled (fastened) by electric resistance welding and then formed. In this case, electric resistance welding is performed to assemble the two iron materials. Due to the replacement of the welding electrode, there is a limitation in that the productivity is hindered and the consumable material cost of the welding electrode consumables occurs.

In addition, the iron material patchwork is a patchwork assembled by welding two iron materials, as shown in FIG. 1, when forming the iron material patchwork (A) with a forming press 120, two iron materials (1) ) Are formed at the same time, and there is a problem that the welds Aa that are already welded to each other are not stretched and damaged during molding.

Furthermore, if the patchwork is not made of two ferrous materials, but is a different material patchwork made of ferrous and non-ferrous materials, the assembly portion (joining part) of the aluminum material is affected by the potential difference between the ferrous material and the non-ferrous material aluminum material. Corrosion may occur, and as a result, the bonding performance of the patchwork decreases, and there is a problem in that the lifespan of the non-ferrous aluminum material decreases.

In order to overcome the above-described conventional problem, the method of manufacturing a patchwork of dissimilar materials according to the present invention, assembles two dissimilar materials by clinching in the assembling step (S130), and also between dissimilar materials, that is, iron material (1). It has a method characteristic including a coating step (S110) of applying a power-saving material to prevent potential difference corrosion between the non-ferrous material aluminum material (2).

Then, a detailed description of the present invention having such a characteristic is as follows.

First, the assembly step (S130) is a step of assembling the iron material (1) and the aluminum material (2) by clinching the laminate (10) before molding the laminate (10). As shown, a partial heating process (S131) and a clinching process (S132) may be provided.

Here, the partial heating step (S131) is a step of partially heating the assembly portion 11, which is a portion to be clinched in the stacked body 10, by irradiation of a heat source, and the clinching step (S132) is a step of heating the stacked body 10 This is a process of punching the assembly part 11 of) with a clinch punching machine 110 to perform clinching. For reference, in the clinching punching machine 110, the upper punching member 112 punches the assembly portion 11 while the lower support member 111 supports the assembly portion 11.

As a non-ferrous material, high-strength aluminum material (2) has low ductility and high hardness, but low ductility means low tensile, and high hardness means that it can be broken by impact when punching strongly. it means.

Therefore, in order to assemble the aluminum material 2 to the iron material 1 by the clinching method, the aluminum material through a partial heating process (S131) in which heat is partially applied only to the assembly portion 11 that is a part to be clinched in the aluminum material. It increases the ductility of the material and causes the hardness to decrease.

The high-strength aluminum material (2) is composed of a dense and sturdy structure before applying heat, but when heat is applied to the assembly section 11 to be clinched, the sturdy and dense internal structure expands enormously due to thermal expansion. The ductility increases and the hardness decreases, and clinching assembly is possible with the characteristics of the changed internal structure. After the clinching assembly, the internal structure changes to the same coarse and firmness as the original structure by natural cooling over time. As a result, since high rigidity can be maintained even after clinching assembly, the problem of lowering the rigidity even when heat is applied for clinching bonding does not occur.

According to the above-described manufacturing method, in the patchwork (B) of dissimilar materials of the present invention, the assembly portion 11, which is a portion to be clinched in the laminate 10, is partially heated and clinched, so that the assembly portion 11 is clinched. Structure can be achieved.

As described above, the laminated body 10 assembled by clinching in the assembling step (S130) may be press-molded in the molding step (S140), which is the last step of FIG. 4, to become a part of an automobile.

Specifically, the shaping step (S140) may consist of a whole heating step (S141) and a shaping step (S142).

The entire heating process (S141) is a process of heating the laminated body 10 as a whole, and the molding process (S142) is a simultaneous molding of the ferrous material (1) and the non-ferrous material by press-forming the heated laminate (10). It is a process to do.

High-strength aluminum material (2) may be fractured by press strike due to a decrease in elongation during press forming. By simultaneously molding the aluminum material 2, it can be manufactured as a vehicle body part.

In other words, press molding is a technology in which the elongation of the base material is used and stretched to the plastic limit (the limit until fracture) with a press to form a desired shape. When the material is tensioned due to the confinement of the welding part, a defect occurs due to the fracture of the welding part. As shown in FIG. 1, the assembling part 11 clinched during press molding by the molding press 120 is also stretched, thereby preventing the occurrence of a fracture defect in the assembling part 11.

By such a manufacturing method, the dissimilar material patchwork (B) according to the present invention can take a structure in which the clinched laminate 10 is entirely heated and press-molded.

On the other hand, the application step (S110) is a step performed before the lamination step (S120) as shown in Figure 5, applying a power saving material to the seating surface on which the aluminum material (2) is seated in the iron material (1). Step.

More specifically, the application step (S110) is a step of performing a structural adhesive 20 is used as a power saving material, applying the structural adhesive 20 to the seating surface of the iron material (1).

In general, corrosion occurs due to the potential difference in the part where the ferrous material and the non-ferrous aluminum material are in contact. Potential difference corrosion is performed by performing surface treatment such as painting, coating, etc. on the surface of the aluminum material in contact with the ferrous material and then assembling (fastening). Can be prevented.

However, if a blow occurs due to punching performed during the clinching operation in the assembly step, a problem occurs in that the coating film on the surface of the material is broken. In addition, in the assembling step, the coating liquid melts and flows due to partial heating of the assembly section, resulting in contamination of the coating, resulting in a problem of deterioration of coating quality such as unpainted or different coating thicknesses.

Therefore, the present invention sprays the structural adhesive 20 onto the seating surface of the iron material 1 on which the aluminum material 2 is seated so as to prevent the corrosion of the potential difference between the iron material and the aluminum material along with the quality of the painting. do.

This structural adhesive 20 even if the assembly part 11 is heated for clinching assembly, it does not melt and flow, but melts and becomes a semi-solid state, so that it is moved to one side between the iron material 1 and the aluminum material 2 and does not come out. Accordingly, it is possible to completely prevent the potential difference corrosion between the iron material (1) and the aluminum material (2).

That is, when the structural adhesive 20 is heated, it becomes liquefied like a coating liquid and does not flow, becomes semi-solid like a gel, does not flow, and remains uniformly applied to the surface. Furthermore, the coating thickness is also applied thicker than the coating thickness, resulting in a thick film. It is formed, and when solidified by natural cooling, due to the property of being hardened and bonded to the surface of the material, the steel material (1) and the aluminum material (2) are strongly bonded to each other, so that between the iron material (1) and the aluminum material (2) Potential difference corrosion can be prevented while maintaining strong fastening properties.

On the other hand, in the clinching process (S132) of the assembly step (S130), the iron material (1) and the aluminum material (2) by the clinch punching machine 110, as shown in Fig. Can be assembled.

That is, one-way pressing for pressing the laminate 10 from the side of the aluminum material 2 and pressing in the other direction for pressing on the side of the iron material 1 are simultaneously performed at portions adjacent to each other of the assembly portion 11, The assembly portion 11 may be pressed in both directions.

In general, the one-way clinching assembly structure is a two-way fastening structure rather than one-way assembly, if a defect occurs in the assembly section due to the breakage of the assembly section due to external force, etc., the assembly section of the material may be separated from each other to prevent this. By being configured, the bonding property of the iron material 1 and the aluminum material 2 can be improved.

In addition, this two-way assembly structure (fastening structure) is compared with a one-way pressing method in which only one material is tensioned by applying a pressure load for punching in both directions by pressing punching in both directions so that the material is tightened while being tensioned. As the bidirectional material is stretched, the distribution of the pressure load and the tensile force of the base material are uniformly distributed in both directions, so that the two materials can be fastened while minimizing the deformation of the material.

By this manufacturing method, the dissimilar material patchwork (B) according to the present invention may have a structure in which the clinching is simultaneously performed in opposite directions at the portions adjacent to each other in the assembly portion 11.

As a result, the dissimilar material patchwork (B) and the manufacturing method of manufacturing the same according to the present invention is a ferrous material in which two dissimilar materials are assembled by clinching, and an aluminum material (non-ferrous material) 2 is seated before assembly. By applying the structural adhesive 20, which is a power-saving material, on the seating surface of (1), the dissimilar materials can be firmly assembled while preventing corrosion of the potential difference between different materials, that is, between the iron material 1 and the aluminum material 2. .

Further, in the present invention, when assembling two different materials by clinching, by assembling the assembling part 11 in both directions by pressing in both directions, the dissimilar materials can be more robustly assembled.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be described.

1: iron material 2: aluminum material
B: different material patchwork 10: laminate
11: assembly part 20: structural adhesive
110: clinching punching machine 111: lower support member
112: upper punching member 120: forming press
S110: application step S120: lamination step
S130: assembly step S131: partial heating process
S132: clinching process S140: forming step
S141: Overall heating process S142: Forming process

Claims (10)

Iron material; And
Including a laminate made of; a non-ferrous material laminated on the ferrous material,
The laminate is clinched to assemble the ferrous material and the non-ferrous material, and a power saving material is disposed between the ferrous material and the non-ferrous material,
The assembly part, which is the part to be clinched in the laminate, is partially heated and clinched,
One-way pressing of pressing the stacked body from the non-ferrous material side and pressing of the other direction pressing from the ferrous material side so that the pressing load and tensile force are uniformly distributed in both directions in the stacked body are adjacent to each other in the assembly part. At the same time, the assembly is pressed in both directions so that the clinching is performed in opposite directions at the same time,
Dissimilar material patchwork, characterized in that a power saving material is disposed between the ferrous material and the non-ferrous material including the assembly portion to prevent corrosion due to a potential difference between the ferrous material and the non-ferrous material.
delete delete The method of claim 1,
The power-saving material is a heterogeneous material patchwork, characterized in that the structural adhesive.
The method of claim 1,
Dissimilar material patchwork, characterized in that the clinched laminate is entirely heated and press-molded.
A lamination step of laminating a non-ferrous material on a ferrous material to form a laminate;
An assembly step of assembling the ferrous material and the non-ferrous material by clinching the laminate before molding the laminate; And
Prior to the laminating step, a coating step of applying a power saving material to the seating surface of the ferrous material on which the non-ferrous material is seated; includes,
The assembly step,
A partial heating step of partially heating an assembly portion, which is a portion to be clinched in the laminate; And
And a clinching step of clinching the assembly portion of the laminate,
The clinching process,
One-way pressing of pressing the stacked body from the non-ferrous material side and pressing of the other direction pressing the stacked body from the ferrous material side so that the pressing load and tensile force are uniformly distributed in both directions in the stacked body are portions adjacent to each other of the assembly unit At the same time, the assembly is pressed in both directions so that the clinching is performed in opposite directions at the same time,
The application step,
Dissimilar material patchwork manufacturing method, characterized in that coating the power saving material between the ferrous material and the non-ferrous material including the assembly portion to prevent corrosion due to a potential difference between the ferrous material and the non-ferrous material.
delete delete The method of claim 6,
The application step,
A method for manufacturing a patchwork of heterogeneous materials, characterized in that a structural adhesive is used as the power saving material, and the structural adhesive is applied to the seating surface of the iron material.
The method of claim 6,
A molding step of press-forming the laminate assembled in the assembling step; further comprising,
The molding step,
An overall heating step of heating the laminate as a whole; And
A molding process of simultaneously forming the ferrous material and the non-ferrous material by press-forming the fully heated laminate;
Dissimilar material patchwork manufacturing method comprising a.

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