WO2008056449A1 - Structure for joining members - Google Patents

Abstract

A structure for joining members, suitable for joining together members having a small thickness and joining members of different materials. The structure has a nut (1), a first member (2) superposed on the nut (1) such that a hole (2) previously formed in the first member (2) continues to the threaded hole of the nut (2), and a second member (4) superposed over the first member (3) so as to cover the hole (2). The material of the second member (4) is caused to enter into the hole (2) of the first member (3) and into the threaded hole of the nut (1) by using friction heat and plastic flow of the material generated by using a joining tool (5).

Description

 Specification

 Member joint structure

 Technical field

 The present invention relates to a member joining structure.

 Background art

 [0002] Friction stir welding is a method for connecting members to be joined together without melting them (see, for example, Patent Document 1).

[0003] In this technique, an object to be bonded is placed on a support tool, which is a backing member, and pressed against the object to be bonded while rotating the bonding tool.

Stir and assimilate the material softened by frictional heat and plastic flow.

[0004] Next, the bonding tool is moved away from the object to be bonded, and the part where the material is assimilated is cured.

The members to be joined are joined to each other.

[0005] The welding tool includes a cylindrical shoulder portion, and a short cylindrical shape that is coaxially connected to the shoulder portion and protrudes toward the tip of the tool, and has a smaller outer diameter than the shoulder portion. .

 Patent Document 1: Japanese Patent Laid-Open No. 2 0 0 4 _ 1 3 6 3 6 5

 Disclosure of the invention

 Problems to be solved by the invention

 [0006] However, the method disclosed in Patent Document 1 does not consider joining members having small thickness dimensions, and cannot join members made of different materials to each other.

[0007] The present invention has been made in view of the above situation, and an object thereof is to provide a member joining structure suitable for mutual joining of members having small thickness dimensions and mutual joining of members having different materials. It is said.

 Means for solving the problem

[0008] In order to achieve the above object, in the present invention, a fitted member having an opening at one end and provided with a groove extending in the circumferential direction on a wall surface of the opening, and a hole that has been previously drilled are provided. A first member overlaid on the fitted member so as to be continuous with the opening; and a second member overlaid on the first member so as to cover the hole, and the second member by frictional heat and plastic flow The material derived from the above is configured so as to enter the hole of the first member and the opening of the mating member.

 [0009] In the present invention, a fitted member having an opening at one end and provided with a groove extending in the circumferential direction on the wall surface of the opening, and a first member overlaid on the fitted member so as to cover the opening. A member and a second member superimposed on the first member, and the material derived from the first and second members is shaped so as to enter the opening of the mating member by frictional heat and plastic flow Take the configuration.

 [0010] In the present invention, comprising an assimilated member having an opening at one end, a first member superimposed on the assimilated member so as to cover the opening, and a second member superimposed on the first member. The material derived from the first and second members is assimilated around the opening of the member to be assimilated by frictional heat and plastic flow.

 [001 1] In the present invention, a first member having an opening, a fitted member that is overlapped with the first member so that a hole having a groove extending in a circumferential direction on a wall surface is continuous with the opening, A second member superimposed on the member to be fitted so as to cover the hole, the member to be fitted is fixed to the first member, and the second member is fitted by frictional heat and plastic flow The structure is shaped so as to enter the opening of the part.

 [0012] The present invention includes a first member, a member to be assimilated having a hole and superimposed on the first member, and a second member superimposed on the member to be assimilated so as to cover the hole. A configuration is adopted in which the second member is assimilated around the opening of the member to be assimilated and the first member by frictional heat and plastic flow.

 [0013] In the present invention, the first member, a fitting member having a hole provided with a groove extending in the circumferential direction on the wall surface, and being overlapped with the first member, and a covering member so as to cover the hole. And a second member stacked on the fitting member, and adopting a configuration in which the second member and the first member are shaped so as to enter the opening of the fitted member by frictional heat and plastic flow.

[0014] In the present invention, a nut can be used for the fitted member or the assimilated member. The invention's effect

 [0015] According to the member bonding structure of the present invention, the following excellent effects can be obtained.

(1) In the present invention, the second member and the fitted member hold the first member, and the material derived from the second member is applied to the fitted member by frictional heat and plastic flow. Even if the thickness of the first and second members is small, or even if the materials of the first and second members are different, they should be joined together efficiently and reliably. Can do.

 (2) In the present invention, the first member is held by the second member and the member to be assimilated, and the materials derived from the first and second members are fitted by frictional heat and plastic flow. Since it is engaged with the groove of the member, even when the thickness dimension of the first and second members is small, both can be joined efficiently and reliably.

 [0018] (3) In the present invention, the second member and the member to be assimilated hold the first member, and the material derived from the first and second members by frictional heat and plastic flow is used as the member to be assimilated. Therefore, even when the thickness of the first and second members is small, both can be efficiently and reliably joined.

 (4) In the present invention, the second member is stacked on the member to be fitted that is fixed to the first member, and the material to be fitted from the second member by frictional heat and plastic flow is used. Even if the thickness of the first and second members is small, or even if the materials of the first and second members are different, they can be joined together efficiently and reliably. be able to.

 [0020] (5) In the present invention, the assimilated member is held by the first and second members, and the material derived from the second member by frictional heat and plastic flow is given to the assimilated member and the first member. Since assimilation is achieved, even when the thickness of the first and second members is small, both can be joined efficiently and reliably.

[0021] (6) In the present invention, the member to be fitted is held by the first and second members, and the material derived from the first and second members is applied to the member to be fitted by frictional heat and plastic flow. Even if the thickness of the first and second members is small, or even if the materials of the first and second members are different, they can be joined together efficiently and reliably. You can.

 [0022] (7) In the present invention, the cost can be reduced by using a standard nut for the fitted member or the assimilated member.

 Brief Description of Drawings

 [0023] FIG. 1 is a conceptual diagram showing a construction procedure of a first example of a member joining structure of the present invention.

 FIG. 2 is a conceptual diagram showing a construction procedure of a second example of the member joining structure of the present invention.

 FIG. 3 is a conceptual diagram showing a construction procedure of a third example of the member joining structure of the present invention.

 FIG. 4 is a conceptual diagram showing a construction procedure of a fourth example of the member joining structure of the present invention.

 FIG. 5 is a conceptual diagram showing a construction procedure of a fifth example of the member joining structure of the present invention.

 FIG. 6 is a conceptual diagram showing a construction procedure of a sixth example of the member joining structure of the present invention.

 FIG. 7 is a conceptual diagram showing a construction procedure of a seventh example of the member joining structure of the present invention.

 FIG. 8 is a conceptual diagram showing a construction procedure of an eighth example of the member joining structure of the present invention. Explanation of symbols

 [0024] 1 Nut (Fitted member / Assembled member)

 2 holes

 3 First member

 4 Second member

 1 0 hole

 1 1 First member

 1 2 Second member

 1 7 First member

 1 8 Second member

 1 9 Assimilation layer

 2 1 Assimilation layer

 2 4 Assimilation layer

 2 7 Assimilation layer

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first example of the member joining structure of the present invention.

 [0027] This member joining structure includes a nut 1, a first member 3 overlaid on a nut 1 so that a hole 2 previously drilled is continuous with the screw hole, and a first member 3 so as to cover the hole 2. The first member 3 is thinner than the second member 4. The second member 4 is overlapped with the first member 3.

 [0028] Although the second member 4 is made of an aluminum alloy, the nut 1 and the first member 3 are not particularly limited, and may be, for example, an aluminum alloy or steel.

 [0029] As shown in FIG. 1 (c), the material derived from the second member 4 enters the hole 2 of the first member 3 and the screw hole of the nut 1 by frictional heat and plastic flow. The first member 3 is held between the second member 4 and the nut 1.

 When the second member 4 is shaped as described above, for example, a joining tool 5 as shown in FIGS. 1 (a) and 1 (b) is used.

 [0031] The joining tool 5 includes a cylindrical pin portion 6 having a smaller outer diameter than a screw hole of the nut 1 and a hole 2 of the first member 3, and a cylindrical shoulder portion 7 having a larger outer diameter. The total length of the pin portion 6 is slightly shorter than the total thickness of the first and second members 3 and 4.

 [0032] The material of the welding tool 5 is made of steel that is harder than an aluminum alloy and has a higher softening temperature.

 [0033] First, the nut 1 is placed on the backing member 8, and the first member 3 and the second member 4 are overlapped.

 [0034] When the material of the nut 1 and the first member 3 is the same, both may be fixed by welding.

 Next, when the pin portion 6 is pressed against the second member 4 while rotating the welding tool 5, the pin portion 6 gradually sinks into this portion softened by frictional heat and plastic flow.

[0036] Eventually, the material derived from the second member 4 softened by frictional heat and plastic flow is pushed from the hole 2 of the first member 3 into the screw hole of the nut 1 and It is crimped to the inner peripheral surface of the screw hole, and finally the shoulder 7 end surface of the welding tool 5 is pressed against the second member 4.

[0037] Furthermore, the welding tool 5 is pulled away from the second member 4, the plastic flow site of the second member 4, and the second member 4 that has been pushed into the screw hole of the nut 1 due to plastic flow. When the material derived from is cured, the material fits into the thread groove, and the backing member 8 is pulled away from the nut 1, thereby completing the joining of the first and second members 3, 4.

 [0038] The hole 9 of the second member 4 after the pin portion 6 of the welding tool 5 has been pulled out can be used for port fastening of another member if a female screw is applied.

[0039] Further, instead of the nut 1, a fitted member having a parallel groove on the wall surface of the opening,

<May be a bag nut or the like.

FIG. 2 shows a second example of the member joining structure of the present invention.

 [0041] In this member joining structure, the nut 1, the first member 11 stacked on the nut 1 so that the hole 10 drilled in advance is connected to the screw hole, and the hole 10 are covered. And a second member 1 2 superimposed on the first member 1 1, and the first and second members 1 1 and 1 2 have the same thickness.

 [0042] Although the second member 12 is made of an aluminum alloy, the nut 1 and the first member 11 are not particularly limited, and may be, for example, an aluminum alloy or steel.

 [0043] As shown in FIG. 2 (c), the material derived from the second member 12 enters the hole 10 of the first member 1 1 and the screw hole of the nut 1 by frictional heat and plastic flow. The first member 11 is held by the second member 12 and the nut 1.

 When the second member 12 is shaped as described above, for example, a joining tool 13 as shown in FIGS. 2 (a) and 2 (b) is used.

[0045] The joining tool 13 includes a cylindrical pin portion 14 having a smaller outer diameter than a hole 10 of the first member 11 1 and a cylindrical shape having a larger outer diameter. The shoulder part 15 is coaxially connected to the tip of the pin 15 and the total length of the pin 14 is The first, first and second members 1 1 and 12 are slightly shorter than the total thickness.

[0046] The material of the welding tool 13 is made of steel that is harder than an aluminum alloy and has a higher softening temperature.

First, the nut 1 is placed on the backing member 8 and the first member 1 1 and the second member 1 2 are overlapped.

 [0048] When the material of the nut 1 and the first member 11 is the same, both may be fixed by welding.

 [0049] Next, while rotating the joining tool 1 3, the pin portion 1 4 is moved to the second member

 When pressed against 1 2, the pin part 14 gradually sinks into this part softened by frictional heat and plastic flow.

 [0050] Eventually, the material force derived from the second member 12 softened by frictional heat and plastic flow. The first member 11 is pushed into the screw hole of the nut 1 from the hole 10 of the first member 1 and the screw hole. The end surface of the shoulder portion 15 of the welding tool 13 is pressed against the second member 12 in the end.

 [0051] Further, the welding tool 13 is pulled away from the second member 12 and the second member 12 is a plastic flow site, and the second member is pressed into the screw hole of the nut 1 with plastic flow. When the material derived from 1 2 is cured, the material fits into the thread groove, and the backing member 8 is pulled away from the nut 1 to complete the joining of the first and second members 1 1 and 1 2. To do.

 [0052] The hole 16 of the second member 12 after the pin portion 14 of the joining tool 13 is pulled out can be used for port fastening of another member if female threading is performed.

 [0053] Further, instead of the nut 1, a member to be fitted having a parallel groove on the wall surface of the opening, a bag nut or the like may be used.

 FIG. 3 shows a third example of the member joining structure of the present invention.

 [0055] This member joining structure includes a nut 1, a first member 17 that is stacked on the nut 1 so as to cover the screw hole, and a second member 18 that is stacked on the first member 17. The first and second members 17 and 18 have the same thickness.

[0056] The first and second members 17 and 18 are made of an aluminum alloy. The material is not particularly limited and may be, for example, an aluminum alloy or steel.

 [0057] As shown in FIG. 3 (c), the material derived from the first and second members 17 and 18 is shaped to enter the screw hole of the nut 1 by frictional heat and plastic flow, The first member 17 is held by the member 18 of 2 and the nut 1.

 [0058] When the first and second members 17 and 18 are shaped as described above, for example, a joining tool 5 as shown in Fig. 3 (a) and Fig. 3 (b) is used.

 [0059] The welding tool 5 has a shape in which a cylindrical pin portion 6 having a small outer diameter with respect to the screw hole of the nut 1 is coaxially connected to a distal end surface of a cylindrical shoulder portion 7 having a larger outer diameter. The total length of the pin portion 6 is slightly shorter than the total thickness of the first and second members 17 and 18.

 [0060] The material of the welding tool 5 is steel that is harder than an aluminum alloy and has a higher softening temperature.

 [0061] First, the nut 1 is placed on the backing member 8, and the first member 17 and the second member 1 8 are overlapped.

 [0062] When the material of the nut 1 and the first member 17 is the same, both may be fixed by welding.

Next, when the pin portion 6 is pressed against the second member 1 8 while rotating the welding tool 5, the pin portion 6 gradually sinks into this portion softened by frictional heat and plastic flow.

 [0064] Eventually, the pin portion 6 of the welding tool 5 penetrates the second member 18 and is pressed against the first member 17 and the pin portion 6 gradually becomes softened by frictional heat and plastic flow. Intrusion occurs around the pin portion 6 of the joining tool 5 in a state where the anabolic layer 19 of the material derived from the first and second members 17 and 18 is softened.

 [0065] This assimilation layer 1 9 force is pushed into the screw hole of the nut 1 and is crimped to the inner peripheral surface of the screw hole. Finally, the shoulder 7 end face of the welding tool 5 is the second member 1 8 It will be in the state pressed against.

[0066] Further, the joining tool 5 is pulled away from the second member 18 and the assimilated layer 19 is cured. As a result, the assimilation layer 19 fits into the thread groove, and the backing member 8 is pulled away from the nut 1 to complete the joining of the first and second members 17 and 18.

[0067] The hole 20 of the second member 18 after the pin portion 6 of the joining tool 5 has been pulled out can be used for the fastening of another member by female threading.

[0068] Further, instead of the nut 1, a fitted member having a parallel groove on the wall surface of the opening,

<May be a bag nut or the like.

FIG. 4 shows a fourth example of the member joining structure of the present invention.

 [0070] This member joining structure includes a nut 1, a first member 17 that is stacked on the nut 1 so as to cover the screw hole, and a second member 18 that is stacked on the first member 17. The first and second members 17 and 18 have the same thickness.

 [0071] The nut 1, first and second members 17 and 18 are all made of an aluminum alloy.

 [0072] As shown in FIG. 4 (c), the material derived from the first and second members 17 and 18 forms an anabolic layer 21 together with the material derived from nut 1 by frictional heat and plastic flow. The nut 1 and the first and second members 1 7 and 1 8 are integrated.

 [0073] When the first and second members 17 and 18 are shaped as described above, for example, a joining tool 13 as shown in Figs. 4 (a) and 4 (b) is used. .

 [0074] The welding tool 13 is formed by coaxially connecting a cylindrical pin portion 14 having a small outer diameter with respect to the screw hole of the nut 1 to a distal end surface of the cylindrical shoulder portion 15 having a larger outer diameter. The pin portion 14 is slightly shorter than the total thickness of the nut 1, first and second members 1 7, 18.

 [0075] The material of the welding tool 13 is made of steel that is harder than an aluminum alloy and has a higher softening temperature.

 First, the nut 1 is placed on the backing member 8 and the first member 17 and the second member 1 8 are overlapped.

 [0077] Next, while rotating the welding tool 1 3, the pin portion 1 4 is moved to the second member.

When pressed against 1 8, the pin part 14 gradually sinks into this part softened by frictional heat and plastic flow. Eventually, the pin portion 14 of the welding tool 1 3 penetrates through the second member 18 and is pressed against the first member 17, and the pin portion 1 4 is softened by frictional heat and plastic flow. This occurs in a state in which the anabolic layer 21 of the material derived from the first and second members 17 and 18 is softened around the pin portion 14 of the joining tool 13.

 This assimilation layer 2 1 also entrains a material derived from the periphery of the screw hole of the nut 1, and finally the shoulder part 15 of the joining tool 1 3 is pressed against the second member 18. It will be attached.

 [0080] Furthermore, the first and second members 1 7, 1 are separated by pulling the joining tool 13 away from the second member 18 8 to cure the assimilation layer 2 1 and pulling the backing member 8 away from the nut 1. 8 joints are completed.

 [0081] The hole 2 2 of the second member 18 after the pin portion 14 of the joining tool 1 3 is pulled out can be used for port fastening of another member if female threading is performed.

 [0082] Further, instead of the nut 1, an assimilated member having a parallel groove on the wall surface of the opening, a bag nut, or a material derived from the periphery of the screw hole of the nut 1 is wound on the assimilated layer 21. A member having no groove on the inner wall of the opening may be used.

 FIG. 5 shows a fifth example of the member bonding structure of the present invention.

 [0084] This member joining structure includes a first member 11 having a hole 10 formed in advance, and a nut 1 superimposed on the first member 11 so that a screw hole is continuous with the hole 10. And a second member 12 stacked on the nut 1 so as to cover the screw hole.

[0085] The second member 1 2 is made of an aluminum alloy, but the nut 1 and the first member 1 1 are made of a common material other than the aluminum alloy, and the nut 1 is welded to the first member 1 1 It is fixed by the technique such as.

[0086] As shown in FIG. 5 (c), the material derived from the second member 12 enters the screw hole of the nut 1 and the hole 10 of the first member 11 by frictional heat and plastic flow. It is shaped like that.

[0087] When the second member 1 2 is shaped as described above, for example, FIG.

A welding tool 13 as shown in Fig. 5 (b) is used. [0088] The welding tool 1 3 includes a cylindrical pin portion 14 having a smaller outer diameter than a hole 10 of the first member 1 1 and a screw hole of the nut 1 and a cylindrical shape having a larger outer diameter. The pin portion 14 has a total length that is the sum of the thicknesses of the nut 1, first and second members 1 1 and 1 2. On the other hand, it is slightly shorter.

 [0089] The material of the welding tool 13 is made of steel that is harder than the aluminum alloy and has a higher softening temperature.

 First, the first member 11 is placed on the backing member 8, and the second member 12 is overlaid on the nut 1 that is already fixed to the first member 11.

[0091] Next, while rotating the welding tool 1 3, the pin portion 1 4 is moved to the second member.

 1 When pressed against 2, the pin part 1 is softened by frictional heat and plastic flow.

4 gradually sinks.

 [0092] Eventually, the material force derived from the second member 12 softened by frictional heat and plastic flow. The screw hole is pushed from the screw hole of the nut 1 into the hole 10 of the first member 1 1 and the screw hole. The end surface of the shoulder portion 15 of the welding tool 13 is pressed against the second member 12 in the end.

 [0093] Further, the joining tool 13 is pulled away from the second member 12 and the second member 12 is pressed into the plastic flow site of the second member 12 and the screw hole of the nut 1 due to the plastic flow. When the material derived from 1 2 is cured, the material fits into the thread groove, and the backing member 8 is pulled away from the first member 11 1, so that the first and second members 1 1, 1 The joining of 2 is completed.

 [0094] The hole 2 3 of the second member 1 2 after the pin portion 1 4 of the joining tool 1 3 is pulled out can be used for port fastening of another member if female threading is performed.

 [0095] Instead of the nut 1, a fitted member having a parallel groove on the wall surface of the opening may be used.

 FIG. 6 shows a sixth example of the member joining structure of the present invention.

[0097] This member joining structure includes a first member 11 having a hole 10 formed in advance, and a nut 1 stacked on the first member 11 so that a screw hole is continuous with the hole 10. And a second member 12 stacked on the nut 1 so as to cover the screw hole. [0098] The nut 1, first and second members 11 and 12 are made of an aluminum alloy as a raw material.

 [0099] As shown in FIG. 6 (c), the material derived from the second member 12 is made of the material derived from the nut 1 and the material derived from the first member 11 1 by frictional heat and plastic flow. At the same time, an assimilation layer 24 is formed to integrate the nut 1 and the first and second members 1 1, 1 2.

 [0100] When the second member 12 is shaped as described above, for example, a joining tool 13 as shown in FIG. 6 (a) and FIG. 6 (b) is used.

 [0101] The joining tool 1 3 is a cylindrical pin portion 1 4 having a smaller outer diameter than the screw hole 1 of the first member 1 1 1 1 10 The pin portion 14 has a total length that is the sum of the thicknesses of the nut 1, first and second members 1 1 and 1 2. On the other hand, it is slightly shorter.

 [0102] The material of the joining tool 1 3 is made of steel that is harder than aluminum alloy and has a higher softening temperature.

 First, the first member 11 is placed on the backing member 8, and the second member 12 is overlaid on the nut 1 that is already fixed to the first member 11.

[0104] Next, while rotating the welding tool 1 3, the pin portion 1 4 is moved to the second member.

 1 When pressed against 2, the pin part 1 is softened by frictional heat and plastic flow.

4 gradually sinks.

 [0105] Over time, the material force derived from the second member 12 softened due to frictional heat and plastic flow. The nut is pushed from the screw hole of the nut 1 into the hole 1 0 of the first member 1 1 and the joining tool. This occurs in the softened state of the anabolic layer 24 of the material derived from the second member 12 and the material derived from the periphery of the screw hole of the nut 1 around the pin portion 14 of the 1 3.

 [0106] The assimilation layer 24 also includes a material derived from the periphery of the hole 10 of the first member 11 1, and finally the shoulder portion 15 of the joining tool 13 is the second end surface. It will be in the state pressed against member 1 of 2.

[0107] Furthermore, the assimilation layer 2 4 is cured by separating the welding tool 1 3 from the second member 1 2. Then, by pulling the backing member 8 away from the first member 11, the joining of the first and second members 11 and 12 is completed.

[0108] The hole 25 of the second member 1 2 after the pin portion 14 of the joining tool 1 3 is pulled out can be used for porting of another member by female threading.

[0109] Further, instead of the nut 1, an assimilated member having a parallel groove on the wall surface of the opening, or a material derived from the periphery of the screw hole of the nut 1, is wound on the anabolic layer 24. A member having no groove on the inner wall of the opening may be used.

FIG. 7 shows a seventh example of the member bonding structure of the present invention.

 [0111] This member joining structure includes a first member 17, a nut 1 overlaid on the first member 17 and a second member 18 overlaid on the nut 1 so as to cover the screw hole. It is equipped with.

 [0112] The first and second members 17 and 18 are made of an aluminum alloy, and the nut 1 and the first member 17 are not particularly limited. For example, the first and second members 17 and 18 are either an aluminum alloy or steel. May be.

[0113] As shown in Fig. 7 (c), the second member 18 and the material derived from the first member 17 are shaped so as to enter the screw hole of the nut 1 by frictional heat and plastic flow. It is made.

 [0114] When the first and second members 17 and 18 are shaped as described above, for example, a joining tool 13 as shown in FIGS. 7 (a) and 7 (b) is used. .

 [0115] In the welding tool 1 3, the cylindrical pin portion 1 4 having a small outer diameter with respect to the screw hole of the nut 1 is coaxial with the tip end surface of the cylindrical shoulder portion 1 5 having a larger outer diameter. It has a continuous shape, and the total length of the pin portion 14 is slightly shorter than the total thickness of the nut 1, first and second members 17, 18.

 [0116] Steel, which is harder and higher in softening temperature than aluminum alloy, is used for the material of the welding tool 1 3.

 [0117] First, the first member 17 and the nut 1 are placed on the backing member 8 in this order, and the nut

 Overlay the second member 1 8 on 1.

[0118] Next, while rotating the welding tool 1 3, the pin portion 1 4 is moved to the second member. When pressed against 1 8, the pin part 14 gradually sinks into this part softened by frictional heat and plastic flow.

 [01 19] Over time, the material force derived from the second member 18 softened due to frictional heat and plastic flow. The material is pressed against the inner peripheral surface of the screw hole of the nut 1 and the pin portion 14 is connected to the first member 1. The material derived from the first member 1 7 that reached 7 and softened by frictional heat and plastic flow was also pressed onto the inner peripheral surface of the screw hole of the nut 1, and finally the shoulder of the joining tool 1 3 Part 1 5 End face is pressed against second member 1 2

[0120] Further, the welding tool 13 is pulled away from the second member 18 and the plastic flow sites of the first member 17 and the second member 18 and the plastic flow are formed in the screw holes of the nut 1. When the material derived from the pushed first and second members 1 7 and 1 8 is cured, the material fits into the thread groove, and the backing member 8 is pulled away from the first member 17. The joining of the first and second members 1 7 and 18 is completed.

 [0121] The hole 2 6 of the second member 18 after the pin portion 14 of the joining tool 1 3 has come out can be used for porting of another member if female threading is applied.

 [0122] Instead of the nut 1, a fitted member having a parallel groove on the wall surface of the opening may be used.

 FIG. 8 shows an eighth example of the member joining structure of the present invention.

 [0124] This member joining structure includes a first member 17, a nut 1 stacked on the first member 17 and a second member 1 8 stacked on the nut 1 so as to cover the screw hole. It is equipped with.

 [0125] The nut 1, first and second members 17 and 18 are all made of an aluminum alloy.

 [0126] As shown in FIG. 8 (c), the material derived from the second member 18 is made of the material derived from the nut 1 and the material derived from the first member 17 due to frictional heat and plastic flow. At the same time, an assimilation layer 27 is formed, and the nut 1 and the first and second members 17 and 18 are integrated.

[0127] When the first and second members 1 7 and 1 8 are shaped as described above, for example, A joining tool 13 as shown in FIG. 8 (a) and FIG. 8 (b) is used.

[0128] The welding tool 1 3 has a cylindrical pin portion 1 4 having a small outer diameter with respect to the screw hole of the nut 1 and is coaxial with the tip surface of the cylindrical shoulder portion 1 5 having a larger outer diameter. It has a continuous shape, and the total length of the pin portion 1 4 is the nut 1, first, second member

Slightly shorter than the total thickness of 1 7 and 1 8.

[0129] The material of the welding tool 1 3 is made of steel which is harder than aluminum alloy and has a higher softening temperature.

[0130] First, the first member 17 and the nut 1 are placed on the backing member 8 in this order, and the nut

 Overlay the second member 1 8 on 1.

[0131] Next, while rotating the welding tool 1 3, the pin portion 1 4 is moved to the second member.

 1 When pressed against 8, the pin part is softened by frictional heat and plastic flow.

4 gradually sinks.

 [0132] Eventually, the material force derived from the second member 18 softened by frictional heat and plastic flow was pushed into the screw hole of the nut 1, and the pin portion 14 reached the first member 17. This occurs in a state where the anabolic layer 27 of the material derived from the first and second members 17 and 18 is softened around the pin portion 14 of the joining tool 13.

 [0133] This assimilation layer 2 7 also entrains the material derived from the periphery of the screw hole of the nut 1, and finally the shoulder portion 15 of the welding tool 1 3 is pressed against the second member 18. It will be attached.

 Furthermore, the joining tool 13 is pulled away from the second member 18, the assimilation layer 2 7 is cured, and the backing member 8 is pulled away from the first member 17, thereby the first and second members. Joining of 1 7 and 1 8 is completed.

 [0135] The hole 2 8 of the second member 18 after the pin portion 14 of the joining tool 1 3 has been pulled out can be used for port fastening of another member if female threading is performed.

 [0136] Further, instead of the nut 1, an assimilated member having a parallel groove on the wall surface of the opening or a material derived from the periphery of the screw hole of the nut 1 is wound on the assimilation layer 27. A member having no groove on the inner wall of the opening may be used.

[0137] The member bonding structure of the present invention is not limited to the above-described embodiment. However, it goes without saying that modifications can be made without departing from the scope of the present invention.

Industrial applicability

 The member joining structure of the present invention can be applied to joining and assembling processes for various parts.

Claims

The scope of the claims  [1] —A fitting member having an opening at the end and provided with a groove extending in a circumferential direction on a wall surface of the opening; and a fitting member so that a hole drilled in advance is connected to the opening. A first member overlaid on the first member so as to cover the hole, and a material derived from the second member by frictional heat and plastic flow is used as the first member. A member joining structure characterized by being shaped so as to enter the opening of the member and the opening of the mating member.  [2] —A fitted member having an opening at an end and provided with a groove extending in a circumferential direction on a wall surface of the opening; and a first member overlaid on the fitted member so as to cover the opening; A second member superimposed on the first member, and the material derived from the first and second members is shaped so as to enter the opening of the mating member by frictional heat and plastic flow. Characteristic member joint structure.  [3] An assimilated member having an opening at one end, a first member overlaid on the assimilated member so as to cover the opening, and a second member overlaid on the first member, friction heat and A member joining structure characterized in that the material derived from the first and second members is assimilated around the opening of the member to be assimilated by plastic flow.  [4] A first member having an opening, a fitting member overlaid on the first member so that a hole having a groove extending in the circumferential direction on the wall surface is connected to the opening, and the hole is covered. And a second member overlaid on the mating member, and the mating member is fixed to the first member, and the second member is opened by frictional heat and plastic flow. A member joining structure characterized by being shaped so as to penetrate into the.  [5] A first member, a member to be assimilated having a hole and superimposed on the first member, and a second member superimposed on the member to be assimilated so as to cover the hole. A member joining structure, wherein the second member is assimilated to the periphery of the opening of the member to be assimilated and the first member by plastic flow.  [6] The first member; and a hole having a groove extending in a circumferential direction on the wall surface, and the first member A fitted member overlaid on the member 1 and a second member overlaid on the fitted member so as to cover the hole, the second member and the first member by frictional heat and plastic flow Is formed so as to enter the opening of the mating member.  5. The member connection according to claim 1, wherein a nut is used as the mating member. 1; 1  6. The member joint structure according to claim 3, wherein a nut is used as the assimilated member.