JP2022115534A - Method for joining metal component and method for manufacturing joint component - Google Patents

Abstract

To provide a caulking joint technique using burring processing which can secure sufficient joint strength without complicating a structure of a mold.SOLUTION: A method for joining a metal component caulks and joins a flange part 2A formed by burring processing, of plate-like parts of a plurality of metal components. The method includes a first recessed shape formation step 102A of forming a first recessed shape 3 in a region as an outer peripheral part of a lower hole 2a before burring processing, and a second recessed shape formation step 102B of forming a second recessed shape 4 in a region as an outer peripheral part of an opening 1a before the burring processing, wherein a region as the flange part 2A is set in the first recessed shape 3, and the caulking step caulks the flange part 2A after or while pushing up the part of the first recessed shape 3 after the burring processing.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a joining method for joining plate-like portions of two or more metal parts by crimping using burring forming, and a method for manufacturing joined parts using the joining method.

In recent years, in order to achieve both the improvement of collision safety and weight reduction of automobile bodies, the development of dissimilar material joining technology for body parts is progressing. Generally, spot welding and other joining methods are used to join automobile pressed parts, but joining dissimilar materials poses problems such as intermetallic compounds. In addition, even ultra-high-tensile steels have welding problems such as LME, and joining methods other than welding are required.

As alternatives to spot welding, joint methods such as friction stir welding (FSW), self-piercing riveting, and mechanical clinching are being developed. However, when these technologies are applied to the mass production of automotive parts, there are issues such as increased equipment investment and costs for additional parts for friction stir welding and self-piercing riveting, and a decrease in joint strength for mechanical clinching.

Here, in Patent Document 1, two metal plates are superimposed so that the prepared holes are aligned, and in this state, burring is performed to form a tubular flange portion, and then the end of the tubular flange portion is Another metal plate is sandwiched between the end crimped portion and the outermost metal plate by bending and crimping the peripheral edge portion in the radial direction so as to wrap the other metal plate. ing.

Further, in the press forming method described in Patent Document 2, a metal plate to be joined having round holes is superimposed on a base metal plate having round holes so that the centers of the holes are aligned, and a punch for burring is applied. It is described that the peripheral edge of the burring portion is press-fitted to the inner peripheral portion of the base metal plate by press-fitting into the round hole of the metal plate to be joined, thereby joining the two metal plates.

Further, in Patent Document 3, a breakthrough punch is inserted into the overlapped portion of the thin metal plates to form a guide hole, and after performing burring processing to bend the peripheral edge of the guide hole toward the back surface, a counter punch is applied. is pressed against the bent edge from the back surface of the thin metal plate to perform a hemming process in which the bent edge is folded back to the back surface of the overlapped portion to join the thin metal plates at the overlapped portion.

JP-A-11-239834 JP-A-8-215778 JP-A-6-190471

However, in the press forming method described in Patent Document 1, the flange portion that rises by burring has a cylindrical shape, and is formed only up to the direction perpendicular to the metal plate surface (the rise of 90 degrees or less with respect to the plate surface). . Therefore, in the step of caulking the end peripheral edge of the cylindrical flange, there is a possibility that the tip of the flange may be crushed and the caulking cannot be performed. In addition, when the tip plate end face of the flange portion (burring portion) is crushed by the mold during the caulking process, the mold is likely to be damaged, which may increase the mass production cost.

Further, the press molding method described in Patent Document 2 is a method in which the peripheral edge portion of the burring portion is crimped to the end surface of the base metal plate. may not be obtained.

Furthermore, the press molding method described in Patent Document 3 is premised on performing everything from drilling to caulking in one process, so the mold structure becomes complicated, and the mold manufacturing costs and repair costs. may increase. Moreover, in this press molding method, if the plate material to be joined is a high-strength material, there is a possibility that it cannot be processed due to restrictions on the mold.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a crimping joining technique using burring that can ensure sufficient joining strength without complicating the structure of the mold. With the goal.

To solve the problem, one aspect of the present invention is a method for joining metal parts by crimping and joining plate-like portions of a plurality of metal parts to flanges formed by burring, the method comprising: A step of forming a pilot hole in a plate-shaped portion of the caulking material that is the selected metal component, a step of forming an opening at a joining position in the plate-like portion of the caulking counterpart material that is a metal component other than the caulking material, and the caulking. A burring process is performed on the outer periphery of the pilot hole of the material, and the periphery of the pilot hole is raised to form a flange portion. a crimping step of crimping the flange portion to join the plate-like portions together in a state, and before the burring step, the region of the crimping material that will be the outer peripheral portion of the pilot hole is adjusted to the standing portion of the flange portion. Before the first concave shape forming step of forming a first concave shape concave on the side opposite to the lifting direction and the burring step, the area of the crimping partner member that will be the outer peripheral portion of the opening is removed from the crimping material. a second recessed shape forming step of forming a second recessed shape recessed in the same direction as the first recessed shape and positioned within the first recessed shape in a state where the crimping member is superimposed thereon. Then, a region to be the flange portion is set in the first concave shape, and in the caulking step, the first concave portion after the burring process is pushed up in the rising direction, or While pushing up, the flange portion is crimped.

According to the aspect of the present invention, when crimping, the first concave portion formed on the outer periphery of the flange portion is pushed up in the rising direction of the flange portion, so that the flange portion is placed on the crimping counterpart material. Transforms to wrap around. Then, the crimping press makes it possible to further crimp the wound portion.

Therefore, according to the aspect of the present invention, it is possible to obtain a joint structure capable of ensuring sufficient joint strength without complicating the mold structure such as the shape of the mold for caulking using burring. can. As a result, according to the aspect of the present invention, for example, caulking joining using high-tensile materials in automobile parts and joining of dissimilar materials become possible, contributing to weight reduction of automobile bodies.

It is a figure explaining the process of the joining method based on embodiment based on this invention. It is a figure explaining an opening process and a pilot hole process. It is a figure explaining a 1st concave shape formation process and a burring process. It is a top view which shows the relationship of the 1st concave-shaped part and the area|region used as a flange part. It is a figure which shows the dimension position of each part. It is a figure explaining another example of formation of the 1st concave shape. It is a figure explaining the example of a caulking process. It is a figure explaining the case of the conventional crimp-joining.

Next, embodiments of the present invention will be described.
The present embodiment relates to a technology for joining metal parts by stacking plate-shaped parts of a plurality of metal parts and crimping and joining flange parts formed by burring. That is, the present embodiment relates to a crimping technique using burring.

Here, the term "plate-shaped part of the metal part" means that at least the part to be crimped is plate-shaped. It indicates that it is okay to have a part.

In this embodiment, an example in which the entire metal part is made of a plate material will be described. Therefore, both the metal component and the plate-like portion of the metal component will be referred to as a metal plate in the description. That is, in the example of this embodiment, a plurality of metal plates are caulked and joined. A metal plate subjected to burring processing is called a caulking material, and a metal plate other than the caulking material is called a caulking mating material.

The method for joining metal parts according to the present embodiment comprises an opening step 100, a pilot hole step 101, a burring step 103, and a crimping step 104, as shown in FIG. Furthermore, the bonding method of this embodiment includes a first recessed shape forming step 102A and a second recessed shape forming step 102B. Each step is performed by press working.

The opening step 100 is a step of forming the opening 1a at the joining position in the plate-like portion of the crimping member 1 .
A pilot hole step 101 is a step of forming a pilot hole 2 a in the plate-like portion (joint portion) of the caulking material 2 .
In the first recessed shape forming step 102A, before the burring step 103, the area of the caulking member 2 that will be the outer periphery of the prepared hole 2a is formed into a first recessed shape 3 that is recessed on the side opposite to the rising direction. It is a process. Here, a region to be the flange portion 2A is set in the first concave shape 3. As shown in FIG.
In the second concave shape forming step 102B, before the burring step, the area that will be the outer peripheral portion of the opening in the caulking member is formed in the same direction as the first concave shape while the caulking member is superimposed on the caulking member. This is a step of forming a second concave shape 4 that is concave and located within the first concave shape.

The burring step 103 is a step of burring the outer periphery of the pilot hole 2a of the caulking member 2 to raise the periphery of the pilot hole 2a to form the flange portion 2A (rising portion). In the burring step 104 of the present embodiment, the caulking partner member 1 is placed on the caulking member 2 by aligning the prepared hole 2a and the opening 1a, and the outer peripheral portion in the first concave shape 3 and the second concave shape 4 are overlapped. The periphery of the pilot hole 2a is raised to form the flange portion 2A while the inner peripheral portion is restrained. In the burring step 104, only the caulking material 2 is constrained and burring is performed, and in the caulking step 104, the second concave shape 4 is arranged in the first concave shape 3 on the caulking material 2. The crimping partner material 1 may be piled up in such a manner as to do.

In the crimping step 104, the flange portion 2A is passed through the opening 1a of the crimping partner member 1, and a plurality of plate-like portions are stacked, and the outer peripheral portion (for example, the outer peripheral portion 3a in the concave shape 3) is bent from the flange portion 2A. is a step of crimping the flange portion 2A to join a plurality of metal plates (plate-like portions). At this time, in the present embodiment, in the crimping step, the flange portion 2A is crimped after or while pushing up the portion of the first concave shape 3 after the burring process.

Here, before the burring process 103, the opening process 100, the pilot hole process 101, the first concave shape forming process 102A, and the second concave shape forming process 102B are performed. There is no particular limitation on the execution order of the first concave shape forming step 102A and the second concave shape forming step 102B.

Moreover, there is no particular limitation on the tensile strength of the metal plates to be joined. For example, among the metal plates to be joined, at least the crimping partner material 1 may be made of a metal plate such as a steel plate or an aluminum alloy material having a tensile strength of 270 MPa or more. The caulking material 2 may also be a metal plate such as a steel plate or an aluminum alloy material having a tensile strength of 270 MPa or more. In the case of joining dissimilar materials, it is preferable to set the tensile strength of the caulking material 2 to be greater than the quoted strength of the caulking counterpart material 1 .
Also, the number of crimping partner members 1 may be two or more.

Next, an example of a specific joining method for metal parts will be described with reference to the drawings.
In the following example, it is assumed that the number of metal plates constituting the caulking material 2 and the caulking member 1 is one each. Two or more crimping members 1 may be provided.

<Opening process 100, prepared hole process 101>
In the opening process 100 and the pilot hole process 101, as shown in FIG. A punch 12 having the same cross-sectional shape as that of FIG.
The diameter of the opening 1a is larger than the diameter of the pilot hole 2a provided in the caulking member 2. As shown in FIG. Specifically, when the crimping partner material 1 and the crimping material 2 are overlapped for crimping and joining, the opening end of the opening 1a is positioned at or outside the outer edge of the region forming the flange portion. .

<First concave shape forming step 102A, second concave shape forming step 102B, and burring step 103>
In this embodiment, as shown in FIG. 3, a single press die is used to perform a first concave shape forming step 102A, a second concave shape forming step 102B, and a burring step 103 as a series of press working. For example. The first concave shape forming step 102A, the second concave shape forming step 102B, and the burring step 103 may be separate pressing steps.
First, as shown in FIG. 3(a), the prepared hole 2a and the opening 1a are concentric, and the crimping member 1 is superimposed on the crimping member 2. Then, as shown in FIG. As shown in FIG. 4, the caulking material 2 and the caulking counterpart material 1 are simultaneously formed into an area ARA (see FIG. 4 ) is pressed from above and below with a lower die 13 and an upper die 14 .

At this time, on the upper surface of the lower mold 13, a concave portion 13a having a shape following the first concave shape 3 is formed on the inner peripheral side at the position where the first concave shape 3 is formed. Further, on the lower surface of the upper die 14, an overhanging portion 14a having a shape following the first concave shape 3 is formed on the inner peripheral surface side at the position where the first concave shape 3 is formed. That is, the recessed portion 13a and the projecting portion 14a face each other in the pressing direction.

Therefore, by pressing the caulking material 2 from above and below with a lower die 13 and an upper die 14 as shown in FIGS. be. As shown in FIG. 4, the first concave shape 3 has an outer peripheral contour shape large enough to arrange the flange forming area ARA on the bottom surface of the first concave shape 3 . That is, the first concave shape 3 is set to have a size that allows setting of the area ARA, which will be the flange portion 2A, within the first concave shape 3 .

Simultaneously with the formation of the first recessed shape 3, a second recessed shape 4 is formed on the outer peripheral portion of the opening 1a of the member 1 to be crimped. In this embodiment, the lower surface of the portion of the second concave shape 4 has a shape following the upper surface of the first concave shape 3 .
The process of FIG. 3(a)→(b) constitutes a first recessed shape forming step 102A and a second recessed shape forming step 102B.

Subsequently, as shown in FIG. 3(b), while the caulking member 2 is constrained by the upper die 14 and the lower die 13, the caulking member 2 shown in FIG. As shown in (b)→(c), by passing a punch 15 for burring, the outer circumference of the pilot hole 2a is raised to form the flange portion 2A.
The processing from (b) to (c) in FIG. 3 constitutes the burring process.

In this burring process, the outer peripheral portion of the first concave shape 3 and the outer peripheral portion of the second concave shape 4 located on the outer periphery of the flange portion 2A are constrained by the upper die 14 and the lower die 13, so that the flange Since it does not affect the molding of the portion 2A, or has almost no effect, it remains as a ring-shaped (doughnut-shaped) concave state on the outer periphery of the flange portion 2A.

Here, as shown in FIG. 5, when the diameter (inner diameter) at the inner peripheral surface of the flange portion 2A is D1 [mm] and the plate thickness of the caulking material 2 is t [mm], the first concave shape 3 It is desirable that the diameter D2 [mm] of the outer peripheral contour shape of is (D1+2t) ≤ D2 ≤ 5D1.
It is physically impossible to make D2 smaller than (D1+2t), and if D2 is larger than 5×D1, stretch flange cracking may occur.

Moreover, it is desirable that the depth X [mm] of the first concave shape 3 is in the range of t≦X≦10t. If X is greater than 10t, stretch flange cracking may occur.
Moreover, it is desirable that the height Y [mm] of the flange portion 2A is in the range of X ≤ Y ≤ 10X. If Y is smaller than X, caulking cannot be achieved, and if Y is larger than 10X, stretch flange cracking may occur.

Here, in the above-described embodiment, the case where the caulking member 2 is formed with the pilot hole 2a and then the first concave shape 3 is formed has been exemplified, but the present invention is not limited to this. For example, as shown in FIGS. 6A to 6B, a lower die 21 having a recess 21a following the first recessed shape 3 and an upper die 21 having an overhang 22a following the first recessed shape 3 After forming the first recessed shape 3 by pressing the caulking material 2 with no prepared hole with the die 22, the upper die 24 and the lower die 23 are used as shown in FIG. 6(c)→(d). It is also possible to restrain and punch out the central portion of the first concave shape 3 with a blanking punch 25 to form the pilot hole 2a. In this case, when forming the first recessed shape 3, stretch-flange forming of the flat bottom can be ignored, and the risk of stretch-flange cracking can be reduced.

Similarly, in the crimping member 1 as well, the opening 1a may be formed after the second concave shape 4 is formed by press working. In this case as well, when forming the second concave shape 4, the flat-bottomed stretch-flange forming can be ignored, and the risk of stretch-flange cracking can be reduced.

In this case, the crimping material 2 and the crimping partner material 1 may be overlapped to form the first recessed shape 3 and the second recessed shape 4 by one press working.
Here, since the outer periphery of the opening 1a is a region that overlaps the outside of the region that becomes the flange portion 2A in plan view, the second concave shape 4 overlaps the outside of the region that becomes the flange portion 2A in plan view. formed in the area.
Further, when the crimping material 2 and the crimping partner material 1 are overlapped, the second concave shape 4 has a size that is positioned within the first concave shape.

<Caulking process 104>
In the crimping step 104, the flange portion 2A raised by the burring step 103, the caulking material 2 having the concave shape 3 formed around the flange portion 2A, and the caulking partner material 1 having the second concave shape 4 are used. (see FIG. 7(a)), it is executed.
In the caulking step 104, first, as shown in FIG. 7B, the caulking member 1 is placed on the caulking member 2 so that the prepared hole 2a and the opening 1a are concentric. That is, the flange portion 2A is inserted into the opening 1a.

Then, as shown in FIG. 7B, the outer periphery of the first concave shape 3 is restrained by the lower mold 26 and the upper mold 28 while the crimping member 1 is placed on the crimping member 2 . Reference numeral 27 is a spacer that adjusts the height of the upper die 28 to form a gap corresponding to the thickness of the caulking material.
Here, in the present embodiment, as the upper mold 28 for crimping the flange portion 2A in the crimping step 104, a conical upper mold 28 is used as shown in FIG. 7(b). The conical upper die 28 is set downward so that the tip of the cone faces the pilot hole. In this case, the caulking is performed while pushing up the first concave shape 3 .

Next, as shown in FIG. 7(b)→(c), by pushing up the first recessed shape 3 from below with a punch 29 in the rising direction, the ring-shaped first recessed shape 3 part is pushed up to the outer peripheral side ( The flange portion 2A is displaced in the diametrical expansion direction by rotating the flange portion side with the lower mold constraining side as a fulcrum.

At this time, the flange portion 2A is guided by the surface of the conical portion 28A of the upper die 28, so that the flange portion 2A is reliably bent so that the ring-shaped first concave portion 3 is rotated and bent. It is deformed in the radial direction (negative angle direction) and wrapped around the crimping member 1 to be crimped.

Here, the punch apex angle θ [°] of the conical portion 28A of the conical upper die 28 is preferably in the range of θ≦150°. If the punch apex angle θ is greater than 150°, there is a possibility that the ring-shaped portion of the first concave portion 3 will be crushed during caulking, making it impossible to perform caulking. Moreover, when the punch apex angle θ is small, the first concave shape 3 is easily rotated. However, as the punch apex angle θ becomes smaller, the thickness of the spacer 27 needs to be increased, and caulking may become looser accordingly.

In this embodiment, the second concave shape 4 overlaps the first concave shape 3, so that the first concave shape 3 is less likely to collapse.
By performing crimping using the conical upper die 28, it is possible to omit the step of final pressing, but the flange portion 2A wound around by the upper die 28 may be subjected to final pressing.

In the above description, the upper die 28 has a downwardly protruding conical portion 28A, and the inclined surface of the conical portion 28A guides the flange portion 2A. However, the present invention is not limited to this. Instead of the conical portion 2A, the upper mold 28 may be an upper mold provided with an R shape having an inclined surface for guiding the flange portion 2A as described above.

Here, in the above description, it is assumed that the pilot hole 2a is a round hole, but the sectional shape of the pilot hole 2a may not be circular. For example, the cross-sectional shape of the pilot hole 2a may be a quadrangular shape or an elliptical shape in which four corners are rounded or chamfered. Moreover, it is not always necessary to burr the entire periphery of the pilot hole 2a, and it is also possible to burr only a portion of the circumference to form the flange portion 2A. It is sufficient that the metal parts can be joined by crimping the formed flange portion 2A. For example, if the pilot hole has a square shape as described above, only the four corners may be burred, or only the four sides may be burred. Further, in this case, the conical portion 28A of the upper die 28 may have a conical shape such as a pyramid other than a conical shape.

In the example shown in FIG. 7, the flange portion is crimped by the upper die 28 while pushing up the recessed portion after the burring process, but the present invention is not limited to this. For example, the flange portion may be caulked by the upper die 28 after pushing up the concave portion after the burring process in the rising direction.

(Other operations)
When the first concave shape 3 is not formed before burring, that is, a pilot hole 2a is formed in the flat plate-shaped caulking member 2 (the punched hole is processed by punching), and the pilot hole 2a is subjected to burring. When the flange portion 2A (burring portion) is formed, as shown in FIG. 8(a), the flange portion 2A has a cylindrical shape and is formed in a direction perpendicular to the plate surface. Therefore, when the flange portion 2A is crushed from above in the caulking process (see FIGS. 8(b) to (d)), the end surface of the tip portion of the flange portion 2A is crushed as shown in FIG. 8(c). Therefore, as shown in FIG. 8(d), crimping may not be possible or may be insufficient.

On the other hand, in the present embodiment, before the burring process, the first concave shape 3 having a size that completely includes the area ARA which is the outer peripheral portion of the pilot hole 2a and which is the flange portion 2A is formed. It is formed in the caulking material 2 in advance.
As a result, the endless annular first concave shape 3 is arranged on the entire outer periphery of the flange portion 2A raised by the burring process.

Then, in the caulking process, by a simple operation of pushing up the first concave shape 3 after the burring process from below in the rising direction of the flange part 2A, the flange part 2A is deformed in the diameter expanding direction, that is, the press in the caulking process With respect to the direction, the flange portion 2A forms a negative angle (a state in which an angle is formed in the radially expanding direction), so that the flange portion 2A can be wound onto the crimping member 1 .
As a result, crimping can be reliably achieved.

(others)
The present disclosure can also take the following configurations.

(1) This embodiment relates to a method for joining metal parts by crimping and joining plate-shaped portions of a plurality of metal parts to a flange part formed by burring, wherein the metal part is selected from the plurality of metal parts. A step of forming a prepared hole in the plate-shaped portion of the caulking material, a burring process of performing burring processing on the outer periphery of the prepared hole of the caulking material, raising the circumference of the prepared hole to form a flange portion, and the above caulking a step of forming an opening at a joining position in a plate-like portion of a crimping member which is a metal part other than the material; a crimping step of crimping the flange portion to join the plate-like portions together, and before the burring step, a region of the crimping material that will be the outer peripheral portion of the pilot hole is set in a direction in which the flange portion is raised. Before the first concave shape forming step of forming a first concave shape concave on the opposite side and the burring step, a region of the crimping partner member which is to be the outer peripheral portion of the opening is placed on the crimping member. a second recessed shape forming step of forming a second recessed shape that is recessed in the same direction as the first recessed shape in a state in which the materials are stacked and is located within the first recessed shape; A region to be the flange portion is set in the recessed shape 1, and in the caulking step, the first recessed portion after the burring process is pushed up in the rising direction, or while being pushed up, the Crimp the flange.

According to this configuration, the first concave shape is formed before the burring process, and the first concave shape is pushed up during the caulking process. This simple operation ensures that the flange portion has a negative angle. Crimping can be performed in this state.
As a result, it is possible to obtain a joint structure capable of securing sufficient joint strength without complicating the mold structure such as the shape of the mold for caulking using burring. As a result, according to the aspect of the present invention, for example, caulking joining using high-tensile materials in automobile parts and joining of dissimilar materials become possible, contributing to weight reduction of automobile bodies.

(2) The first recessed shape forming step and the second recessed shape forming step are performed by one press working in a state in which the crimping member is superimposed on the crimping member.
The first concave shape and the second concave shape can be formed by one press working.

(3) In the burring step, the pilot hole and the opening are aligned, the caulking partner member is placed on the caulking member, and the outer peripheral portion within the first concave shape and the inside of the second concave shape are stacked. The periphery of the prepared hole is raised to form the flange portion while the outer peripheral portion of is restrained.
According to this configuration, it is possible to more reliably leave the concave portion formed by the first concave shape and the second concave shape on the outer periphery of the flange portion.

(4) The outer peripheral contour shape of the flange portion and the first concave shape is a circular shape in plan view, the diameter of the inner peripheral surface of the flange portion is D1 [mm], and the thickness of the caulking material is t [ mm], the diameter D2 [mm] of the outer peripheral contour shape of the first concave shape 3 is within the range of the formula (1).
(D1+2t) ≤ D2 ≤ 5 D1 (1)
According to this configuration, crimping can be performed while suppressing stretch flange cracking more reliably.

(5) When the thickness of the caulking material is t [mm], the depth X [mm] of the first concave shape is within the range of the formula (2).
t≦X≦10t (2)
According to this configuration, crimping can be performed while suppressing stretch flange cracking more reliably.

(6) When the depth of the first concave shape is X [mm], the height Y [mm] of the flange portion is within the range of the formula (3).
X≦Y≦10X (3)
According to this configuration, crimping can be performed while suppressing stretch flange cracking more reliably.

(7) The punch used for crimping the flange in the crimping process has a conical surface that contacts the tip of the flange, and the cone-shaped punch apex angle θ [°] is , (4).
θ≦150° (4)
According to this configuration, in the caulking process, the deformation of the flange portion when the first concave shape is lifted is guided by the conical surface of the upper die, and the flange portion is reliably wound on the caulking partner member 1 and caulked. By setting the angle as described above, the first concave shape that is pushed up is suppressed from collapsing, and the flange portion can be more reliably wrapped around the crimping member.
Note that the punch apex angle θ is set to 60° or more.

(8) Among the metal parts, at least the crimping partner material is made of a metal plate having a tensile strength of 270 MPa or more.
According to this configuration, even if the crimping partner material 1 is made of a member such as an aluminum alloy material, it is possible to more reliably join dissimilar materials.

(9) In the method for manufacturing a bonded component according to the present embodiment, plate-like portions of a plurality of metal components are bonded by the method for bonding metal components according to the present embodiment.
According to this configuration, it is possible to more easily manufacture the joining component using burring.
The joining parts are, for example, automobile body parts.

(10) A flange in which the plate-shaped portions of a plurality of metal parts are superimposed and the outer peripheral portion of the hole formed in the plate-shaped portion of the caulking material, which is a metal part selected from the plurality of metal parts, is raised by burring. The portion is inserted into an opening formed at a joining position in a plate-like portion of a crimping partner member, which is a metal part other than the crimping material, and the flange portion is crimped toward the outer peripheral side of the opening, thereby overlapping. In the joint structure of metal parts in which the plurality of plate-shaped portions are joined, the portion of the plate-shaped portion of the caulking material that is outer peripheral than the flange portion is bent to form the outer peripheral surface of the opening of the caulking member. The flange portion of the crimping material is crimped by contacting with the crimping material, and the opposing surfaces of the flange portion and the outer peripheral surface of the opening of the crimping member are in surface contact with each other. Joining structure of parts.
The present structure can be configured by the above-described crimping method according to the present embodiment.

1 Crimping mating material (metal part)
1a Opening 2 Caulking material (metal part)
2A Flange portion 2a Prepared hole 3 First concave shape 4 Second concave shape 100 Opening process 101 Prepared hole process 102A First concave shape forming process 102B Second concave shape forming process 103 Burring process 104 Caulking process

Claims (9)

A method for joining metal parts by crimping and joining plate-shaped parts of a plurality of metal parts with flanges formed by burring,
a step of forming pilot holes in the plate-like portion of the caulking material, which is a metal component selected from the plurality of metal components;
A step of forming an opening at a joining position in a plate-like portion of a crimping partner member, which is a metal part other than the crimping material;
a burring process of applying burring to the periphery of the prepared hole of the caulking material and raising the periphery of the prepared hole to form a flange;
a crimping step of crimping the flange portion to join the plate-like portions together in a state in which the prepared hole and the opening are aligned and the counter-crimping material is superimposed on the crimping material;
with
a first recessed shape forming step, prior to the burring step, of forming a first recessed shape in a region of the caulking material, which is to be the outer peripheral portion of the pilot hole, in a direction opposite to the rising direction of the flange portion; ,
Before the burring step, a region of the crimping partner member, which is to be the outer peripheral portion of the opening, is recessed in the same direction as the first concave shape in a state where the crimping counterpart member is superimposed on the crimping member, and a second recessed shape forming step of forming a second recessed shape located within the first recessed shape;
has
A region to be the flange portion is set in the first concave shape,
In the crimping step, the first concave portion after the burring process is pushed up in the rising direction, or while being pushed up, the flange portion is crimped.
A method for joining metal parts, characterized by: 2. The method according to claim 1, characterized in that the first recessed shape forming step and the second recessed shape forming step are performed by one press working in a state in which the crimping member is superimposed on the crimping member. A method of joining metal parts. In the burring step, the prepared hole and the opening are aligned, the caulking mating member is placed on the caulking member, and the outer peripheral portion within the first concave shape and the outer peripheral portion within the second concave shape are stacked. 3. The method for joining metal parts according to claim 1, wherein the periphery of the pilot hole is raised to form the flange portion while the flange portion is restrained. The outer peripheral contour shape of the flange portion and the first concave shape is a circular shape in a plan view,
When the diameter of the inner peripheral surface of the flange portion is D1 [mm] and the plate thickness of the caulking material is t [mm], the diameter D2 [mm] of the outer peripheral contour shape of the first concave shape is (1) 4. The method for joining metal parts according to any one of claims 1 to 3, wherein the range of the formula is set.
(D1+2t) ≤ D2 ≤ 5 D1 (1) When the thickness of the caulking material is t [mm], the depth X [mm] of the first concave shape is within the range of formula (2). A method for joining metal parts according to any one of Claims 1 to 3.
t≦X≦10t (2) When the depth of the first concave shape is X [mm], the height Y [mm] of the flange portion is within the range of formula (3). A method for joining metal parts according to any one of the above.
X≦Y≦10X (3) In the crimping step, the punch used for crimping the flange has a conical surface that contacts the tip of the flange,
The method for joining metal parts according to any one of claims 1 to 6, wherein the conical punch apex angle θ [°] is within the range of formula (4).
θ≦150° (4) The method for joining metal parts according to any one of claims 1 to 6, wherein at least a crimping partner material of the metal parts is made of a metal plate having a tensile strength of 270 MPa or more. A method for manufacturing joined parts, comprising joining plate-like portions of a plurality of metal parts by the method for joining metal parts according to any one of claims 1 to 7.

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