WO2024084689A1

WO2024084689A1 - Fixed structure, fixing method, and fixing device

Info

Publication number: WO2024084689A1
Application number: PCT/JP2022/039318
Authority: WO
Inventors: 宗佑松浦; 雅暉野崎; 優治田中; 洋輔中村; 勝坂本; 英紀紺谷
Original assignee: かがつう株式会社
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2024-04-25
Also published as: JP7408207B1

Abstract

The present invention addresses the problem of providing a fixed structure, a fixing method, and a fixing device with which a high-precision surface can be held and manufacturing costs can be reduced.　Provided is a structure that fixes a plurality of members including at least a first member, the structure being characterized in that a first through-hole is provided to the first member, a caulk body is inserted through the first through-hole, one end of the first through-hole has formed therein a first opening section that is open in one flat surface section of the first member, the one flat surface section of the first member has a first recessed section provided so as to surround the first opening section, a first head section at one end of the caulked caulk body is accommodated in the first recessed section, and the one flat surface section of the first member and the first head section are made flush with each other. Also provided are a fixing method that has a step for caulking both ends of the caulk body at the same time, and a fixing device.

Description

Fastened structure, fastening method and fastening device

The present invention relates to a structure having multiple members attached to it, a method for attaching multiple members, and an apparatus for attaching them.

A conventional method for fastening multiple components is a crimping structure using rivets. In a structure fastened by this crimping structure using rivets, both ends of the rivet heads protrude from the surface of the structure to be fastened. These protruding rivet heads can cause problems in the structure.
For example, in the case of a heat sink, when the flat surface of the heat sink needs to be tightly attached to the flat surface of the cooled member, if the head of the rivet protrudes from the flat surface of the heat sink, it will not be possible to tightly attach the heat sink to the flat surface of the cooled member.
Therefore, a method has been proposed in which multiple bosses are formed on one side of the base of the heat sink, the bosses are inserted into multiple boss holes formed in the heat sink, and the bosses are crimped to fix the base and the heat sink together without forming any protrusions on the other side of the base (Patent Document 1).

Also, in a rivet fastening structure, a fastening method has been proposed in which a recess is formed in the surface of the structure so that the head of the rivet does not protrude from the structure, and the structure is fastened with a rivet that has a dish-shaped head that fits into the recess, thereby preventing the formation of a protruding part. (Patent Document 2)

JP 2018-77995 A JP 2009-115314 A

The fastening method proposed in Patent Document 1 can maintain a flat surface without protrusions, but requires the manufacture of a base having multiple bosses, which is not easy to manufacture and is expensive.
In addition, the fastening method proposed in Patent Document 2 can maintain a flat surface without any protrusions, but there are manufacturing errors in the recesses on the surface of the structure and in the dished head, which creates unevenness in the housing for the dished head, making it impossible to maintain a highly accurate flat surface. There is also the problem that the manufacturing of rivets with dished heads is very costly.

The present invention aims to provide a fixed structure, a fixing method, and a fixing device that can solve the above problems, maintain a highly accurate flat surface, and reduce manufacturing costs.

In order to solve such problems, the present invention has the following configuration.
A structure in which a plurality of members including at least a first member are fixed to each other,
The first member has a first through hole,
A crimping body is inserted into the first through hole,
One end of the first through hole forms a first opening that opens into one planar portion of the first member,
a first recess is provided in one planar portion of the first member so as to surround the first opening,
A first head portion of one end of the crimped body is accommodated in the first recess,
A structure characterized in that one flat surface of the first member and the first head are flush with each other.

The present invention also has the following configuration.
A method for fastening a plurality of members, comprising the steps of:
Stacking the plurality of members so that through holes formed in the plurality of members are aligned;
a step of inserting a crimping body into the through holes of the aligned members;
A fastening method comprising the step of simultaneously crimping both ends of the crimping body.

The present invention also has the following configuration.
A fastening device having a punch, a stripper, a die, and a die pin, for fastening a plurality of members,
A crimping body is inserted into a through hole passing through the plurality of members,
The punch abuts against one end of the crimping body,
The stripper abuts against one flat surface of the plurality of members,
The die abuts against the other flat surface of the plurality of members,
The die pin abuts against the other end of the crimping body,
A fastening device, characterized in that the punch, the stripper, the die and/or the die pin are moved so as to simultaneously fasten both ends of the crimping body.

By storing the head of the crimped rivet in a recess formed on the surface of the structure to be fixed, it is possible to provide a fixed structure, a fixing method, and a fixing device that maintain a highly accurate flat surface and reduce manufacturing costs by using a crimped body in which both ends are crimped at the same time.

1A and 1B are diagrams of a structure 1 according to a first embodiment of the present invention, in which FIG. 1A shows the structure 1 before crimping and FIG. 1 is a diagram showing a part of a crimping process in which the structure 1 of the first embodiment of the present invention is crimped by a press machine 2. FIG. 11A to 11C are diagrams showing the remaining part of the crimping process in which the structure 1 of the first embodiment of the present invention is crimped by a press machine 2. 4 is a graph showing the movement of each part of a press machine 2 in a crimping process according to the first embodiment of the present invention. 1 is a perspective image of a cutaway view of the structure 1 according to the first embodiment of the present invention. 1 is a perspective image of a cutaway view of another example of the structure 1 according to the first embodiment of the present invention. 1A and 1B are diagrams of a structure 3 according to a second embodiment of the present invention, in which FIG. 1A shows the structure before crimping and FIG. 11 is a diagram showing a part of a crimping process in which the structure 3 of the second embodiment of the present invention is crimped by a press machine 2'. 1A and 1B are diagrams showing a structure 4 according to a modified example 2 of the present invention, in which FIG. 1A shows the structure 4 before crimping and FIG.

Hereinafter, a structure 1 according to an embodiment of the present invention will be described with reference to the drawings.
In the following description, the same reference numerals in different drawings indicate parts having the same functions, and duplicated descriptions in each drawing will be omitted as appropriate.

[Embodiment 1]
FIG. 1 is a diagram of a structure 1 according to a first embodiment of the present invention, in which (a) is a diagram showing the structure before crimping and (b) is a diagram showing the structure after crimping.

[Configuration of each component]
The structure 1 of the first embodiment is composed of three metal members: a base member 11 (first member), a U-shaped member 12 (second member), and a rod 13 (crimped body).
The structure 1 is a heat sink, and the base material 11 is brought into contact with the surface of a member to be cooled, and heat is released into the air from the base material 11 and the U-shaped material 12.

The base material 11 is a rectangular plate-like member molded from aluminum, and has a base 111 and a cylindrical protrusion 112 (protrusion) protruding from the center of one surface 1111 of the base 111 (the other planar portion of the first member).
The base material 11 is formed with a circular through hole 113 (first through hole) that is concentric with the protrusion 112 and through which the rod 13 can be inserted. The protrusion 112 has one opening (second opening) of the through hole 113, and the other surface 1112 (one flat surface of the first member) of the base 111 of the base material 11 has the other opening (first opening) of the through hole 113. Around the other opening of the through hole 113, a circular recess 114 (first recess) that is concentric with the through hole 113 and has a larger diameter than the through hole 113 is formed. As described later, the recess 114 is formed as a counterbore for accommodating the head 1311 (first head) of the lower end 131 formed when the rod 13 is crimped, and its radius and depth are designed so that the head 1311 of the lower end 131 can be accommodated without excess or deficiency.

The U-shaped member 12 is a member formed from aluminum, and is formed by bending a rectangular plate material so that its cross section is U-shaped, and includes a base portion 121 and a bent portion 122 (standing portion). Note that the bent portion 122 is not limited to a shape bent at a right angle, and may be a shape that forms a curved surface.
A circular fitting hole 123 (fitting portion) that can fit onto the protrusion 112 of the base material 11 is formed in the base 121 of the U-shaped material 12. The height of the fitting hole 123 is approximately the same as the height of the protrusion 112. The inner diameter of the fitting hole 123 is approximately the same as the outer diameter of the protrusion 112 of the base material 11, so that the fitting hole 123 can fit onto the protrusion 112 without any gaps.

The rod 13 is a cylinder made of aluminum and is longer than the length of the through hole 113 plus the depth of the recess 114. The diameter of the rod 13 is approximately the same as the diameter of the through hole 113 of the base material 11, so the rod 13 can be inserted into the through hole 113 without any gaps.

[Structure after crimping]
The projection 112 of the base material 11 is fitted into the fitting hole 123 of the U-shaped material 12, the rod 13 is inserted into the through hole 113 of the base material 11, and the rod 13 is crimped by simultaneously applying pressure from above and below using a press machine 2. The structure 1 obtained in this manner is shown in FIG.
The lower end 131 of the rod 13 is crimped and formed into a head 1311 that is housed substantially tightly in the recess 114 of the base material 11 .
The head portion 1311 and the other surface 1112 of the base material 11 are flush with each other.
The head 1311 and the recess 114 of the base material 11 are abutted against each other in a strongly pressed state by applying pressure to the rod 13 and crimping it.
The upper end 132 of the rod 13 is crimped and formed into a substantially truncated cone shape together with the protrusion 112 of the base member 11 and the fitting hole 123 of the U-shaped member 12 .
This generally truncated cone-shaped portion has a larger diameter than the original through-hole 113, and prevents the rod 13 from slipping out of the through-hole 113 together with the head 1311 of the rod 13. In addition, the generally truncated cone shape prevents the fitting hole 123 of the U-shaped member 12 from slipping out of the protrusion 112 of the base member 11.
In addition, the rod 13, which has been crimped by applying pressure from above and below, is deformed into a generally barrel shape with a bulged central portion in the longitudinal direction (between the generally truncated cone portion and the head portion 1311). Due to this generally barrel-shaped bulge itself and the strong adhesion between the circumferential surface of the rod 13 and the inner circumferential surface of the through-hole 113, the rod 13 is prevented from slipping out vertically.
FIG. 5 shows a perspective image of the cut and crimped structure.

The base material 11 is not limited to a rectangular shape, and any shape can be selected depending on the application.
The shape of the U-shaped material 12 before being bent into a U-shaped cross section is not limited to a rectangular shape, and any shape can be selected depending on the application.
In addition, the height of the fitting hole 123 of the U-shaped material 12 does not need to be approximately the same as the height of the protrusion 112 of the base material 11, and may be lower than the height of the protrusion 112 or may be the same as the thickness of the base 121 of the U-shaped material 12. In addition, the height of the fitting hole 123 may be slightly higher than the height of the protrusion 112.
FIG. 6 shows an example in which the height of the fitting hole 123 is the same as the thickness of the base portion 121 .

The base material 11, the U-shaped material 12, and the rod 13 may be formed of metals other than aluminum, for example, simple metals such as copper and iron, alloys, and the like.
Furthermore, the base material 11, the U-shaped material 12, and the rod 13 do not need to be made of the same metal; one may be made of a different metal than the other two, or all three may be made of different metals.
In addition, another member may be disposed between the base material 11 and the U-shaped material 12 .

[Crimping device (fixing device)]
The configuration of a press machine 2, which is a crimping device for crimping the structure 1, will be described with reference to FIG.
The press 2 has a die 21 that contacts the base material 11 from below, a stripper 22 that contacts the U-shaped material 12 from above, a die pin 23 that contacts the rod 13 from below, and a punch 24 that contacts the rod 13 from above.

The die 21 is a thick plate-like member and has an insertion hole 213 near the center through which the die pin 23 can be inserted.
The die 21 is attached with four die suspension bolts 211 .
The die 21 is configured to be lowered together with the die hanging bolts 211 by a movable means (not shown).
A die pin backing 231 is installed on the die hanging bolt 211 so as to be vertically slidable. A coil spring 212 is installed between the die 21 and the die pin backing 231 concentrically with the die hanging bolt 211, and biases the die 21 and the die pin backing 231 in a direction separating them.

The die pin 23 is a rod-shaped member that is installed between an insertion hole 213 provided in the die 21 and a die pin backing 231. A die damper 232 is arranged around the die pin 23, and when the die 21 descends a predetermined amount, it comes into contact with the die damper 232.

The stripper 22 is a thick plate-like member, and has an insertion hole 223 near the center through which the punch 24 can be inserted. The stripper 22 also has a protrusion 224 that protrudes downward from the main body of the stripper 22 so as to be able to abut against the base 121 while avoiding the bent portion 122 of the U-shaped material 12.
The stripper 22 is provided with four stripper hanging bolts 221 .
The stripper 22 is configured to be lowered together with the stripper hanging bolt 221 by a movable means (not shown).
A punch backing 241 is installed so as to be vertically slidable on the stripper hanging bolt 221. A coil spring 222 is installed between the stripper 22 and the punch backing 241 concentrically with the stripper hanging bolt 221, and biases the stripper 22 and the punch backing 241 in a direction separating them.

The punch 24 is a rod-shaped member, and is disposed between an insertion hole 223 formed in the stripper 22 and a punch backing 241 .
The punch 24 is configured to be lowered together with the punch backing 241 by a movable means (not shown).
A stripper damper 242 is disposed around the punch 24 , and when the punch backing 241 descends a predetermined amount, it comes into contact with the stripper damper 242 .

[Crimping process (fixing method)]
2 and 3 are diagrams showing the crimping process for crimping the base material 11, the U-shaped material 12, and the rod 13, and the process progresses in the order of FIG. 2(a), FIG. 2(b), FIG. 3(c), FIG. 3(d), and FIG. 3(e).
The crimping process is performed by a press machine 2. In this press machine 2, a die 21, a stripper 22, and a punch 24 move to crimp the rod 13.

(Step a) The projection 112 of the base material 11 is fitted into the fitting hole 123 of the U-shaped material 12, and the assembly of the base material 11 and the U-shaped material 12 is placed on the die 21. Next, the rod 13 is inserted into the through hole 113 of the base material 11, and the lower end 131 of the rod 13 is placed on the die pin 23. After that, the stripper 22 and punch 24 move downward, and the projection 224 of the stripper 22 abuts against the base 121 of the U-shaped material 12, as shown in FIG. 2(a).

(Step b) The stripper 22 stops and only the punch 24 continues to move downward until the punch 24 abuts against the upper end 132 of the rod 13, as shown in FIG. 2(b).

(Step c) Furthermore, when the punch 24 moves downward, the upper part of the rod 13 is slightly crimped and deformed, as shown in FIG. 3(a). The die pin 23 remains fixed, but as the punch 24 moves, the lower end 131 of the rod 13 is pressed against the die pin 23 relatively, so that the lower part of the rod 13 is also slightly crimped and deformed.

3D, when the punch backing 241 comes into contact with the stripper damper 242, the movement of the stripper 22 is resumed, and the stripper 22 moves downward together with the punch 24. At this time, the die 21 also starts to move downward.
Although the die pin 23 remains fixed, the punch 24 moves, and the die 21 and stripper 22 also move, so that the lower end 131 of the rod 13 is relatively heavily pressed by the die pin 23. Due to this pressure, the lower part of the rod 13 is also crimped and significantly deformed.
Moreover, since the punch 24 continues to move, the upper portion of the rod 13 is further crimped and significantly deformed.

(Step e) When the die 21 comes into contact with the die damper 232, the downward movement of the die 21, the stripper 22 and the punch 24 stops. At this time, the upper surface of the die 21 is flush with the upper surface of the die pin 23.
3(e), the protrusion 112 of the base material 11, the fitting hole 123 of the U-shaped material 12, and the upper part of the rod 13 are formed into a generally truncated cone shape. The lower part of the rod 13 is also crimped and is housed in the recess 114 of the base material 11 formed as a counterbore. The crimped head 1321 of the lower end 131 of the rod 13 is flush with the other surface 1112 of the base material 11.
After stopping, the die 21, the stripper 22 and the punch 24 immediately start moving upward and return to their original positions.

One structure 1 is formed in one cycle of the above-mentioned steps a to e, and by repeating this cycle, structures 1 can be mass-produced.
4 is a graph showing the change in the positions of the die 21, the protrusion 224 of the stripper 22, and the punch 24 in one cycle, where (1), (2), and (3) respectively indicate the positions of the punch 24, the protrusion 224 of the stripper 22, and the die 21. Also, (a), (b), and (e) in the graph respectively indicate the time t at which the states shown in FIG. 3(a), FIG. 3(b), and FIG. 3(e) are reached.

As described above, the lower end 131 of the rod 13 is crimped by the die pin 23, and when the crimping is completed, the upper surface of the die 21 is flush with the upper surface of the die pin 23. Therefore, the crimped head 1321 of the lower end 131 of the rod 13 is molded to be flush with the other surface 1112 of the base material 11 with high precision.
This highly accurate evenness allows the other surface 1112 of the base material 11 to come into contact with the surface of another member, such as a member to be cooled, without any gaps, thereby reducing the thermal conduction resistance at the boundary between these two surfaces and increasing the heat dissipation efficiency as a heat sink.
In addition, the lower end 131 of the rod 13 is crimped and stored in the recess 114 of the base material 11 , so that the crimped head 1311 of the lower end 131 is strongly pressed against the inner surface of the recess 114 of the base material 11 .
This strong compression firmly bonds the base material 11 and the rod 13, and also reduces the thermal conduction resistance at the interface between the base material 11 and the rod 13, thereby increasing the heat dissipation efficiency as a heat sink.
Furthermore, the structure 1 can be manufactured simply by fixing the base material 11 and the U-shaped material 12 using the cylindrical rod 13, so that the manufacturing cost can be reduced.

In the first embodiment, the punch 24 presses the rod 13 from above, and at the same time, the die pin 23 presses the lower end 131 relatively.
Without being limited to this, the die 21 and stripper 22 may be kept fixed and the die pin 23 may be moved upward to pressurize the lower end 131, i.e., the punch 24 may pressurize the rod 13 from above and, at the same time, the die pin 23 may directly pressurize the lower end 131.
In either method, the rod 13 is crimped by applying pressure from both the upper and lower directions at the same time.
In contrast to these, by moving only the punch 24, the lower end 131 and the upper end 132 of the rod 13 can be crimped, that is, the rod 13 can be crimped by applying pressure only from above. Note that by moving only the die pin 23, the rod 13 can be crimped by applying pressure only from below. In either method, the rod 13 is crimped by applying pressure only from above or below.

In the method of crimping the rod 13 by simultaneously applying pressure from both the top and bottom directions, the travel distance (stroke) of the die 21, stripper 22, die pin 23, punch 24, etc. can be halved compared to the method of crimping by applying pressure from one direction. This makes it possible to prevent buckling of the rod 13 that occurs when the rod 13 is crimped.

[Modification 1]
The first modification is a structure in which another member (not shown) is disposed between the base member 11 and the U-shaped member 12 of the first embodiment.
It is also possible to place an intermediate material (fourth member) made of another material, such as copper, which has a higher thermal conductivity than aluminum, between the base material 11 and the U-shaped material 12, both made of aluminum, and crimp the three members together with a rod 13.
In this way, by using a material with high thermal conductivity, the heat conduction efficiency of the heat sink as a whole is increased, and the heat dissipation performance can be improved.
In addition, an intermediate material (fourth member) made of a metal material such as stainless steel that is stronger than aluminum can be placed between the base material 11 and the U-shaped material 12, both made of aluminum, and the three members can be crimped together with a rod 13.
In this way, by using a material having high strength, the strength of the heat sink as a whole increases, and it is possible to configure a heat sink suitable for locations where strength is required.
The intermediate material does not need to be a material of the same shape and size as the first base material 31 and/or the U-shaped material 12, but may be a material of a different shape and size.
In addition, two or more intermediate members may be disposed between the base member 11 and the U-shaped member 12 .

[Embodiment 2]
FIG. 7 is a diagram of a structure 3 according to a second embodiment of the present invention, in which (a) shows the structure before crimping and (b) shows the structure after crimping.

[Configuration of each component]
The structure 3 of the second embodiment is composed of three metal members: a first base member 31 (first member), a second base member 32 (third member), and a rod 13 (crimped body).
The first base material 31 and the second base material 32 are members having the same shape.
The structure 3 is a heat sink, and the first base material 31 or the second base material 32 is brought into contact with the surface of the member to be cooled, and heat is released from the first base material 31 and the second base material 32 into the air.

The first base material 31 is a rectangular plate-like member formed of aluminum, and has a circular through hole 313 (first through hole) through which the rod 13 can be inserted. The other opening (first opening) of the through hole 313 is located on the other surface 312 (one flat surface of the first member) of the first base material 31. A circular recess 314 (first recess) that is concentric with the through hole 313 and has a larger diameter than the through hole 313 is formed around the other opening of the through hole 313. As described below, the recess 314 is formed as a countersink to accommodate the head 1311 (first head) at the lower end formed when the rod 13 is crimped, and its radius and depth are designed so that the head 1311 at the lower end can be accommodated without excess or deficiency.

The second base material 32 is a rectangular plate-like member formed of aluminum, and has a circular through hole 323 (third through hole) through which the rod 13 can be inserted. The other opening (third opening) of the through hole 323 is located on the other surface 322 (one flat surface of the third member) of the second base material 32. A circular recess 324 (third recess) that is concentric with the through hole 323 and has a larger diameter than the through hole 323 is formed around the other opening of the through hole 323. As described below, the recess 324 is formed as a countersink to accommodate the head 1321 (second head) at the upper end that is formed when the rod 13 is crimped, and its radius and depth are designed so that the head 1321 at the upper end can be accommodated without excess or deficiency.

The rod 13 is a cylinder made of aluminum, and is longer than the sum of the length of the through hole 313 plus the depth of the recess 314, and the length of the through hole 323 plus the depth of the recess 324. The diameter of the rod 13 is approximately the same as the diameter of the through hole 313 of the first base material 31 and the through hole 323 of the second base material 32, and the rod 13 can be inserted into the through hole 313 and the through hole 323 without any gaps.

[Structure after crimping]
One surface 311 of the first base material 31 and one surface 321 of the second base material 32 are overlapped so that the through hole 313 of the first base material 31 and the through hole 323 of the second base material 32 are aligned, and the rod 13 is inserted through the through hole 313 of the first base material 31 and the through hole 323 of the second base material 32, and the rod 13 is crimped by simultaneously applying pressure from above and below using a press machine 2'. The structure 3 obtained in this manner is shown in FIG. 7(b).
The lower end 131 of the rod 13 is crimped and formed into a head 1311 that is housed substantially tightly in the recess 314 of the first base member 31 .
Similarly, the upper end 132 of the rod 13 is crimped and formed into a head 1321 that is substantially tightly received in the recess 324 of the second base member 32 .
The head portion 1311 and the other surface 312 of the first base material 31, and the head portion 1321 and the other surface 322 of the second base material 32 are flush with each other.
The head 1311 and the recess 314 of the first base material 31, and the head 1321 and the recess 324 of the second base material 32 are abutted against each other in a strongly pressed state by applying pressure to the rod 13 and crimping it.
In addition, the rod 13, which has been crimped by applying pressure from above and below, is deformed into a generally barrel-like shape with a bulge near the center in the longitudinal direction. Due to this generally barrel-like bulge itself, and also due to the strong adhesion between the circumferential surface of the rod 13 and the inner circumferential surfaces of the through

holes

313 and 323, the rod 13 is prevented from slipping out vertically.

The first base material 31 and the second base material 32 are not limited to a rectangular shape, and any shape can be selected depending on the application.
The first base material 31 and the second base material 32 do not need to be members of the same shape and size, but may be members of different shapes and sizes.

The first base material 31, the second base material 32, and the rod 13 may be formed of a metal other than aluminum, for example, a simple metal such as copper or iron, or an alloy.
Furthermore, the first base material 31, the second base material 32 and the rod 13 do not need to be made of the same metal; one may be made of a different metal than the other two, or all three may be made of different metals.
In addition, another member may be disposed between the first base material 31 and the second base material 32 .

[Crimping device (fixing device)]
The configuration of a press machine 2', which is a crimping device for crimping the structure 1, will be described with reference to FIG.
The press machine 2' has the same configuration as the press machine 2, and has a die 21' that contacts the first base material 31 from below, a stripper 22' that contacts the second base material 32 from above, a die pin 23' that contacts the rod 13 from below, and a punch 24' that contacts the rod 13 from above.
However, the shape of a stripper 22 ′ of the press 2 ′ is different from the shape of the stripper 22 of the press 2 .
The stripper 22' comes into contact with the second base material 32 from above, and therefore the contact surface is formed in a flat shape.

[Crimping process (fixing method)]
FIG. 8 is a diagram showing a process of crimping the base material 11, the U-shaped material 12, and the rod 13, which corresponds to the process shown in FIG. 2(a).
The crimping process is carried out by a press machine 2'. In this press machine 2', a die 21', a stripper 22' and a punch 24' move to crimp the rod 13.
The crimping process of the second embodiment is substantially the same as that of the first embodiment, so only the differences will be described.

(Step a) An assembly in which one surface 311 of the first base material 31 and one surface 321 of the second base material 32 are overlapped so that the through hole 313 of the first base material 31 and the through hole 323 of the second base material 32 are aligned is placed on the die 21'. Next, the rod 13 is inserted through the through hole 313 of the first base material 31 and the through hole 323 of the second base material 32, and the lower end 131 of the rod 13 is placed on the die pin 23'. After that, the stripper 22' and the punch 24' move downward, and the stripper 22' comes into contact with the second base material 32 as shown in FIG. 8.

(Steps b to e) Steps b to e are the same as steps b to e in the first embodiment, but the shape of the structure 3 when the crimping of the rod 13 is completed is different from the shape of the structure 1 in the first embodiment.
The lower end 131 and the upper end 132 of the rod 13 are crimped and housed in a recess 314 of the first base material 31 and a recess 324 of the second base material 32, which are formed as countersunk holes. The crimped head 1311 of the lower end 131 and the crimped head 1321 of the upper end 132 of the rod 13 are flush with the other surface 312 of the first base material 31 and the other surface 322 of the second base material 32, respectively.

As described above, the lower end 131 and the upper end 132 of the rod 13 are crimped by the die pin 23' and the punch 24', respectively, and when the crimping is completed, the upper surface of the die 21' and the lower surface of the stripper 22' are flush with the upper surface of the die pin 23' and the lower surface of the punch 24', respectively. Therefore, the crimped head 1311 of the lower end 131 of the rod 13 and the crimped head 1321 of the upper end 132 of the rod 13 are molded to be flush with the other surface 312 of the first base material 31 and the other surface 322 of the second base material 32, respectively, with high precision.

This highly accurate evenness allows the other surface 312 of the first base material 31 and the other surface 322 of the second base material 32 to come into contact with the surface of another member, such as a member to be cooled, without any gaps. This reduces the thermal conduction resistance at the boundary between these two surfaces, and increases the heat dissipation efficiency as a heat sink.
In addition, the lower end 131 of the rod 13 is crimped and housed in the recess 314 of the first base material 31, so that the crimped head 1311 of the lower end 131 is strongly pressed against the inner surface of the recess 314 of the first base material 31. Similarly, the crimped head 1321 of the upper end 132 is strongly pressed against the inner surface of the recess 324 of the second base material 32.
This strong compression firmly bonds the first base material 31 and the second base material 32 to the rod 13, and also reduces the thermal conduction resistance at the interface between the first base material 31 and the second base material 32 and the rod 13, thereby increasing the heat dissipation efficiency as a heat sink.
Furthermore, the structure 3 can be manufactured simply by fixing the first base material 31 and the second base material 32 together using the cylindrical rod 13, so that the manufacturing cost can be reduced.

In the second embodiment, similarly to the first embodiment, the punch 24' presses the rod 13 from above, and at the same time, the lower end 131 is relatively pressed by the die pin 23'.
Without being limited to this, the die 21' and stripper 22' may be kept fixed and the die pin 23' may be moved upward to pressurize the lower end 131, i.e., the punch 24' may pressurize the rod 13 from above and at the same time, the die pin 23' may directly pressurize the lower end 131.
In either method, the rod 13 is crimped by applying pressure from both the upper and lower directions at the same time.
In contrast to these, by moving only the punch 24', the lower end 131 and the upper end 132 of the rod 13 can be crimped, that is, the rod 13 can be crimped by applying pressure only from above. Note that by moving only the die pin 23', the rod 13 can be crimped by applying pressure only from below. In either method, the rod 13 is crimped by applying pressure only from above or below.

In the method of crimping the rod 13 by simultaneously applying pressure from both the top and bottom directions, the travel distance (stroke) of the die 21', stripper 22', die pin 23', punch 24', etc. can be halved compared to the method of crimping by applying pressure from one direction. This makes it possible to prevent buckling of the rod 13 that occurs when the rod 13 is crimped.

[Modification 2]
Modification 2 is a structure 4 in which another member is disposed between the first base material 31 and the second base material 32 of embodiment 2.
9A and 9B are diagrams of the structure 4 of the second modified example, in which FIG. 9A shows the structure before crimping and FIG. 9B shows the structure after crimping.
It is also possible to place an intermediate material 33 (fourth member) made of another material such as copper that has a higher thermal conductivity than aluminum between a first base material 31 and a second base material 32 made of aluminum, and crimp the three members together with a rod 13.
In this way, by using a material with high thermal conductivity, the heat conduction efficiency of the heat sink as a whole is increased, and the heat dissipation performance can be improved.
In addition, an intermediate material (fourth member) made of a metal material such as stainless steel that is stronger than aluminum can be placed between the first base material 31 and the second base material 32, both of which are made of aluminum, and the three members can be crimped together with the rod 13.
In this way, by using a material having high strength, the strength of the heat sink as a whole increases, and it is possible to configure a heat sink suitable for locations where strength is required.
It should be noted that the intermediate material 33 does not need to be a member having the same shape and size as the first base material 31 and/or the second base material 32, and may be a member having a different shape and size.
In addition, two or more intermediate materials may be disposed between the first base material 31 and the second base material 32 .

The above describes the fixed structures by using as examples embodiment 1 a structure 1 having one plate-shaped member, a base material 11, and one U-shaped member 12 fixed thereto, and embodiment 2 a structure 3 having two plate-shaped members, a first base material 31 and a second base material 32, fixed thereto. However, the present invention is not limited to embodiment 1 and embodiment 2.
The members to be fixed may be members of any shape. Furthermore, unlike the first and second modified examples, the number of members to be fixed is not limited to two, but may be three or more members.

Furthermore, the

structures

1, 3, and 4, the press machine 2, and the press machine 2', and the fixing methods using these, of the embodiment 1 and its variant 1 and the embodiment 2 and its variant 2 of the present invention have been described in detail with reference to the drawings, but the specific configurations are not limited to these embodiments and their variants, and even if there are design changes and the like that do not deviate from the gist of the present invention, they are included in the present invention.
Furthermore, the above-described embodiments and their modified examples can be combined by utilizing each other's technologies, so long as there are no particular contradictions or problems in the purpose, configuration, and the like.

1 Structure 11 Base material 111 Base 1111 One surface 1112 of base 111 The other surface 112 of base 111 Projection 113 Through hole 114 Recess 12 U-shaped material 121 Base 122 Bent portion 123 Fitting hole 13 Rod 131 Lower end 1311 Head 132 with lower end 131 crimped Upper end 1321 Head 2, 2' with upper end 132 crimped Press machine 21, 21' Die 211 Die hanging bolt 212 Coil spring 213 Insertion hole 22, 22' Stripper 221 Stripper hanging bolt 222 Coil spring 223 Insertion hole 224 Projection 23, 23' Die pin 231 Die pin backing 232 Die damper 24, 24' Punch 241 Punch backing 242 Stripper damper 3 Structure 31 First base material 311 One surface 312 of first base material 31 The other surface 313 of first base material 31 Through hole 314 Recess 32 Second base material 321 One surface 322 of second base material 32 The other surface 323 of second base material 32 Through hole 324 Recess 33 Intermediate material 4 Structure

Claims

A structure in which a plurality of members including at least a first member are fixed to each other,
The first member has a first through hole,
A crimping body is inserted into the first through hole,
One end of the first through hole forms a first opening that opens into one planar portion of the first member,
a first recess is provided in one planar portion of the first member so as to surround the first opening,
A first head portion of one end of the crimped body is accommodated in the first recess,
A structure characterized in that one flat surface of the first member and the first head are flush with each other.
the plurality of members includes a second member,
the other end of the first through hole forms a second opening that opens into a cylindrical protrusion formed on another flat surface portion of the first member,
The second member is disposed around the protrusion,
The second member is formed with a substantially annular fitting portion that fits with the protrusion,
2. The structure according to claim 1, wherein the protrusion, the crimping body in the protrusion, and the fitting portion are crimped to form a substantially truncated cone shape.
the plurality of members includes a third member,
The third member is provided with a third through hole that is substantially concentric with the first through hole,
The crimping body is inserted into the first through hole and the third through hole,
one end of the third through hole forms a third opening that opens into one planar portion of the third member,
a third recess is provided in one planar portion of the third member so as to surround the third opening,
A second head portion of the other end of the crimped body is accommodated in the third recess,
2. The structure according to claim 1, wherein one flat surface of the third member and the second head are flush with each other.
A heat sink in which the second member of the structure described in claim 2 has a vertical portion perpendicular to the other flat surface of the first member.
The heat sink described in claim 4, characterized in that a fourth member having a higher thermal conductivity and/or strength than the first member and/or the second member is disposed between the first member and the second member.
A heat sink characterized in that a fourth member having a higher thermal conductivity and/or strength than the first member and/or the second member is disposed between the first member and the second member of the structure described in claim 2.
A heat sink characterized in that a fourth member having a higher thermal conductivity and/or strength than the first member and/or the third member is disposed between the first member and the third member of the structure described in claim 3.
The structure described in any one of claims 1 to 3 or the heat sink described in any one of claims 4 to 7, characterized in that the crimped body is deformed into an approximately barrel shape.
A method for fastening a plurality of members, comprising the steps of:
Stacking the plurality of members so that through holes formed in the plurality of members are aligned;
a step of inserting a crimping body into the through holes of the aligned members;
A fastening method comprising the step of simultaneously crimping both ends of the crimping body.
The fastening method described in claim 9, characterized in that one end of the crimped body is relatively pressurized by pressurizing the multiple members.
A fastening device having a punch, a stripper, a die, and a die pin, for fastening a plurality of members,
A crimping body is inserted into a through hole passing through the plurality of members,
The punch abuts against one end of the crimping body,
The stripper abuts against one flat surface of the plurality of members,
The die abuts against the other flat surface of the plurality of members,
The die pin abuts against the other end of the crimping body,
A fastening device, characterized in that the punch, the stripper, the die and/or the die pin are moved so as to simultaneously fasten both ends of the crimping body.
12. The fastening device according to claim 11, wherein the punch, the stripper and the die are moved while the die pin is fixed, and the other end of the crimping body is relatively pressed by the die pin.