JP2017177133A - Different-material joined component and different-material joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a different-material joined component and a different-material joining method that are able to effectively improve the joining strength of first and second metal components.SOLUTION: A different-material joined component 1 is a component formed by joining a first metal component 2 and a second metal component 3 lower in fusion point than the first metal component 2. The first metal component 2 has a general shaft part 21, and a reduced diameter part 22 the outer periphery of which is reduced in diameter than the general shaft part 21. The second metal component 3 has a hole 31 joined to the diameter reduced part 22. A part 23 of the reduced diameter part 22, which part is joined to the joined hole 31, gradually inclines, and has a plurality of inclined faces 24, 25 that are smaller in inclination angle θ1, θ2, which is an acute angle with respect to the center axial line C of the first metal component 2, as the inclination faces are located nearer to the leading end side D1 of the reduced diameter part 22 with respect to the general shaft part 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a dissimilar material joining part and a dissimilar material joining method using parts made of different materials.

  Techniques for joining metal parts made of different materials include techniques such as diffusion joining, friction joining, ultrasonic vibration joining, brazing, and welding. Among them, in the friction welding technique, the first metal part and the second metal part are brought into contact with each other while rotating the first metal part, and frictional heat generated between the first metal part and the second metal part is caused. Join both parts.

For example, in the friction joining method of Patent Document 1, a tapered tip portion of a shaft-shaped member made of a metal material having a hardness higher than that of the holed member is attached to a straight hole portion of the holed member made of a magnetic metal. Fitting and friction bonding are disclosed. This friction joining is performed by applying a load to the shaft-like member and relatively rotating both of them while pressing the shaft-like member against the holed member.
Moreover, in the common rail disclosed in paragraph [0027] and FIG. 17 of Patent Document 2, a branch joint having a conical protrusion with a flat tip is provided on a common rail main body made of a thick steel pipe or a solid round bar. Friction welding is disclosed.

JP 2006-35306 A JP 2006-233964 A

  In the friction welding method disclosed in Patent Document 1, the inclination angle of the tapered tip portion of the shaft-like member is constant. Then, when the tip of the shaft-like member rotates and is pressed against the hole of the holed member, a pressure component that acts perpendicularly on the tapered tip of the shaft-like member due to a load applied to the shaft-like member Is uniform throughout the tip. Therefore, there is a possibility that sufficient pressure for friction welding may not be applied to the holed member from the proximal end portion of the tapered distal end where friction welding is finally started. As a result, an unjoined portion may be formed between the proximal end portion of the tapered distal end portion and the hole portion of the holed member.

  On the other hand, in the common rail disclosed in paragraph [0027] of Patent Document 2 and FIG. 17, the entire front end surface and side surfaces of the protrusions of the branch joined body are friction welded to the recesses formed in the common rail main body. Therefore, most of the pressure acting on the common rail main body from the branch joined body is applied to the tip surface of the branch joined body projection, and the side surface of the branch joined body projection may not be applied with sufficient pressure for friction welding. There is. As a result, there is a possibility that an unjoined portion is formed between the base end side portion of the side surface of the protrusion of the branched joined body where the friction welding is finally started and the common rail body.

  The present invention has been made in view of such problems, and is obtained by providing a dissimilar material joining component and a dissimilar material joining method that can effectively increase the joining strength between the first metal component and the second metal component. It is a thing.

One aspect of the present invention is a first metal part having a general shaft portion and a reduced diameter portion whose outer periphery is reduced in diameter than the general shaft portion;
A second metal part having a melting point lower than the melting point of the first metal part and having a joining hole joined to the reduced diameter part,
The joint portion joined to the joint hole in the reduced diameter portion is
A plurality of inclined surfaces that are inclined stepwise and have a smaller inclination angle as an acute angle with respect to the central axis of the first metal part as the inclined surface is located on the tip side where the reduced diameter portion is formed with respect to the general shaft portion. Or a dissimilar material joined part having a curved inclined surface that is recessed in a curved shape.

Another aspect of the present invention is a first metal part having a general shaft part and a reduced diameter part whose outer periphery is smaller than the general shaft part, and the melting point is lower than the melting point of the first metal part, A method of joining a second metal part having a joining hole in which a reduced diameter portion is disposed,
In the reduced diameter portion, the outer periphery of the joint portion arranged in the joint hole is
A plurality of inclined surfaces that are inclined stepwise and have a smaller inclination angle as an acute angle with respect to the central axis of the first metal part as the inclined surface is located on the tip side where the reduced diameter portion is formed with respect to the general shaft portion. Or formed as a curved inclined surface recessed in a curved shape,
The first metal component is pressed against the second metal component while being relatively rotated about a central axis thereof, and the plurality of inclined surfaces or the curved inclined surface of the joint is followed. In the dissimilar material joining method, the inner wall surface of the joining hole is deformed to join the first metal part and the second metal part.

  In the dissimilar material joining part, the shape of the joining part joined to the joining hole of the second metal part in the reduced diameter part of the first metal part is devised to join the first metal part and the second metal part. Strength is increased. Specifically, the joint portion in the reduced diameter portion has a plurality of inclined surfaces having a smaller inclination angle as an acute angle with respect to the central axis of the first metal part, or a curved surface shape that is recessed into a curved surface, as the inclined surface is located on the distal end side. Has an inclined surface.

  The inclination angle as an acute angle of the plurality of inclined surfaces with respect to the central axis of the first metal part is smaller as the inclined surface is located on the tip side. When the first metal part and the second metal part are joined by friction welding or the like, the first metal part and the second metal part act in a direction perpendicular to the plurality of inclined surfaces by the load applied between the first metal part and the second metal part. The pressure component to be increased becomes larger as the inclined surface is located on the base end side. For this reason, in such dissimilar material joined parts having a plurality of inclined surfaces, in particular, a gap that weakens the bonding strength between the proximal end portion of the inclined surface located on the most proximal side of the joined portion and the joining hole. Etc. does not exist.

  Further, the inclination angle as the acute angle of the curved inclined surface changes so as to approach the central axis of the first metal component as it goes toward the tip side. When the first metal part and the second metal part are joined by friction welding or the like, the first metal part and the second metal part act in a direction perpendicular to the curved inclined surface by a load applied between the first metal part and the second metal part. The pressure component to be increased increases toward the base end side of the curved inclined surface. Therefore, in the dissimilar material joined part having such a curved inclined surface, there is no gap or the like that weakens the bonding strength between the proximal end portion of the curved inclined surface of the joint and the joint hole.

  Therefore, according to the dissimilar material bonded component, the bonding strength between the first metal component and the second metal component can be effectively increased.

In the above-described dissimilar material joining method, the joint portion in the reduced diameter portion has a curved surface that is recessed into a plurality of inclined surfaces having a smaller inclination angle with respect to the central axis of the first metal part or a curved surface as the inclined surface is located on the tip side. The first metal part having the inclined surface is joined to the second metal part.
When joining the first metal part and the second metal part, the first metal part is brought into pressure contact with the second metal part while being relatively rotated about its central axis. At this time, when the outer periphery of the joint is formed as a plurality of inclined surfaces, it acts in a direction perpendicular to the plurality of inclined surfaces by a load applied between the first metal component and the second metal component. The pressure component increases as the inclined surface is located on the base end side. Therefore, the diffusion energy for performing friction welding can be increased as the inclined surface is located on the base end side. In particular, it is possible to effectively perform the frictional bonding between the proximal end portion of the inclined surface located on the most proximal side of the joint portion and the joining hole, and the base of the inclined surface located on the most proximal side. It is possible to prevent a gap or the like that weakens the bonding strength from being formed between the end side portion and the bonding hole.

  In addition, when the outer periphery of the joint is formed as a curved inclined surface when the first metal component is pressed against the second metal component while rotating relative to the center axis of the first metal component, Due to the load applied between the first metal part and the second metal part, the pressure component acting in the direction perpendicular to the curved inclined surface becomes larger toward the base end side of the curved inclined surface. Therefore, the diffusion energy for performing the friction welding can be increased toward the base end side of the curved inclined surface. In particular, it is possible to effectively perform frictional bonding between the proximal end portion of the curved inclined surface of the joint portion and the joining hole, and between the proximal end portion of the curved inclined surface and the joining hole. Further, it is possible to prevent a gap or the like that weakens the bonding strength from being formed.

  Therefore, according to the dissimilar material joining method, the joining strength between the first metal part and the second metal part can be effectively increased.

Sectional explanatory drawing which shows the dissimilar-material joining component concerning Embodiment 1. FIG. Explanatory drawing which shows the pressure component which acts between 1st metal components and 2nd metal components concerning Embodiment 1. FIG. Sectional explanatory drawing which shows the state which carries out the friction welding of the 1st metal component and 2nd metal component concerning Embodiment 1. FIG. The graph which shows typically the time-dependent change of the rotational speed of the 1st metal component concerning Embodiment 1, and the load added to a 2nd metal component from a 1st metal component. Cross-sectional explanatory drawing which shows dissimilar-material joining components concerning Embodiment 2. FIG. Explanatory drawing which shows the pressure component which acts between 1st metal components and 2nd metal components concerning Embodiment 2. FIG. Cross-sectional explanatory drawing which shows the state which carries out the friction welding of the 1st metal component and 2nd metal component concerning Embodiment 2. FIG. Cross-sectional explanatory drawing which shows dissimilar-material joining components concerning Embodiment 3. FIG. Explanatory drawing which shows the pressure component which acts between 1st metal components and 2nd metal components concerning Embodiment 3. FIG.

A preferred embodiment of the above-described dissimilar material joining component and dissimilar material joining method will be described with reference to the drawings.
(Embodiment 1)
As shown in FIG. 1, the dissimilar material joined component 1 of this embodiment is obtained by joining (connecting) a first metal component 2 and a second metal component 3 having a melting point lower than the melting point of the first metal component 2. It is. The first metal component 2 has a general shaft portion 21 and a reduced diameter portion 22 whose outer periphery is reduced in diameter than the general shaft portion 21. The second metal component 3 has a joint hole 31 in which the reduced diameter portion 22 is disposed and joined to the reduced diameter portion 22. As shown in FIG. 2, the joint portion 23 joined to the joint hole 31 in the reduced diameter portion 22 is inclined in a stepwise manner on the distal end side D <b> 1 where the reduced diameter portion 22 is formed with respect to the general shaft portion 21. The inclined surface located has a plurality of inclined surfaces 24 and 25 having smaller inclination angles θ1 and θ2 as acute angles with respect to the central axis C of the first metal part 2.

First, the dissimilar material joining component 1 of this embodiment will be described in detail.
The dissimilar material (dissimilar material) joining part 1 of this embodiment is a solid-phase joining as a friction joining, and is used for various applications as a mechanical part composed of two metal parts 2 and 3 having different strengths. Used. The first metal part 2 is made of an iron-based material containing iron, and the second metal part 3 is made of an aluminum material containing aluminum. The hardness and strength of the first metal part 2 are higher than the hardness and strength of the second metal part 3.
The first metal part 2 is a shaft-like part, and the second metal part 3 is a plate-like part (flange part) in which a joining hole 31 is formed. The dissimilar-material joining component 1 of this embodiment is used, for example, for applications in which high strength is required for the shaft-shaped portion and light weight is required for the plate-shaped portion.

  As shown in FIGS. 1 and 2, the reduced diameter portion 22 of the present embodiment is formed at the distal end portion of the first metal component 2, and the joint portion 23 is the entire reduced diameter portion 22. The plurality of inclined surfaces 24 and 25 constituting the joint portion 23 are inclined in two stages, and the plurality of inclined surfaces 24 and 25 are adjacent to the first inclined surface 24 and the tip side D1 of the first inclined surface 24. And the second inclined surface 25 having an inclination angle θ2 smaller than the inclination angle θ1 as an acute angle of the first inclined surface 24 with respect to the central axis C. The inclination angles θ1 and θ2 are acute angles formed on the base end side D2 between the central axis C of the first metal part 2 and the inclined surfaces 24 and 25. The outer peripheral surface of the joint portion 23 is formed in a shape in which a boundary portion between the first inclined surface 24 and the second inclined surface 25 is recessed toward the inner peripheral side. The boundary between the first inclined surface 24 and the second inclined surface 25 may be formed in a curved surface shape.

  The dissimilar material joining component 1 is configured such that there is no gap that weakens the joining strength between the proximal end portion 241 of the first inclined surface 24 located closest to the proximal end D2 and the joining hole 31. As for the junction part 23 of the 1st metal component 2 of this form, the whole contacts the joining hole 31, and is joined. Further, the joint hole 31 of the second metal part 3 is adjacent to the joint part 23 in the general shaft part 21 of the first metal part 2 in addition to the joint part 23 of the reduced diameter part 22 of the first metal part 2. The part 211 is joined. With this configuration, the base end side portion 241 of the first inclined surface 24 positioned closest to the base end side D <b> 2 is securely embedded in the joint hole 31, and a gap is further formed between the base end side portion 241 and the joint hole 31. Can be made difficult to form.

Next, the dissimilar material bonding method of this embodiment will be described.
In the dissimilar material joining method, the first metal part 2 and the second metal part 3 are joined by friction welding.
First, as shown in FIG. 3, a first metal part 2 having a general shaft part 21 and a reduced diameter part 22 and a second metal part 3 having a joint hole 31 in which the reduced diameter part 22 is arranged are prepared. In the reduced diameter portion 22 of the first metal part 2, the outer periphery of the joint portion 23 disposed in the joint hole 31 is formed to be inclined in two stages. The outer periphery of the joint portion 23 is formed by the first inclined surface 24 and the second inclined surface 25 adjacent to the distal end side D1 of the first inclined surface 24. Further, the joint hole 31 of the second metal part 3 is formed perpendicular to the surface of the second metal part 3.

  The joining hole 31 of this embodiment is formed as a straight hole perpendicular to the surface of the second metal part 3. The inner diameter of the joining hole 31 is formed in a size within the change range of the outer diameter of the part where the second inclined surface 25 is formed in the joining portion 23. The inner diameter of the joint hole 31 is a size between the minimum outer diameter of the distal end side D1 of the second inclined surface 25 in the joint portion 23 and the maximum outer diameter of the proximal end D2 of the second inclined surface 25 of the joint portion 23. Form with. In addition, the joining hole 31 can also be formed as a hole which a hole diameter expands in taper shape toward the base end side D2 in which the 1st metal component 2 is located, for example.

  Next, the first metal part 2 is held on a main shaft that can be adjusted in rotational speed and can be advanced and retracted, and the second metal part 3 is held on a holding base. Next, as shown in the figure, the first metal component 2 is opposed to the second metal component 3, and the first metal component 2 is rotated and brought closer to the second metal component 3. Then, the proximal end side opening 311 of the joint hole 31 of the second metal part 3 contacts the second inclined surface 25 in the joint part 23 of the first metal part 2. At this time, a load F is applied from the first metal part 2 to the second metal part 3, and friction welding is performed between the second inclined surface 25 and the joint hole 31.

  When friction welding is performed between the second inclined surface 25 and the joining hole 31, the material around the joining hole 31 is deformed so as to follow the second inclined surface 25. Further, when the load F is applied from the first metal part 2 to the second metal part 3, the deformation of the second metal part 3 proceeds and the first metal part 2 further approaches the second metal part 3. To do. The material around the joint hole 31 of the second metal part 3 also contacts the first inclined surface 24 in the joint part 23 of the first metal part 2. At this time, a load F is applied from the first metal part 2 to the second metal part 3, and not only between the second inclined surface 25 and the joining hole 31 but also between the second inclined surface 25 and the joining hole 31. Friction welding is performed.

  In this way, the inner wall surface of the joint hole 31 is first brought into contact with the second inclined surface 25 located on the distal end side D1 of the joint portion 23, and thereafter, the range in which the inner wall surface of the joint hole 31 is in contact with the second inclined surface 25. Not only that, the first inclined surface 24 located on the base end side D2 of the second inclined surface 25 is enlarged. Then, the first metal part 2 and the second metal part 3 are frictionally joined by deforming the inner wall surface of the joining hole 31 following the first inclined surface 24 and the second inclined surface 25 of the joint portion 23.

As shown in FIG. 4, the load F applied from the first metal part 2 to the second metal part 3 is a first-stage load F1 and a second-stage load F2 larger than the first-stage load F1. It changes in two stages. In the same figure, the rotational speed V of the 1st metal component 2 by a main axis | shaft and the time change of the load F applied to the 2nd metal component 3 from the 1st metal component 2 are shown.
The first-stage load F1 is the first metal component 2 after the friction welding is started until the material around the joint hole 31 is deformed into a state along the first inclined surface 24 and the second inclined surface 25. To the second metal part 3. The load F2 in the second stage is the difference between the first metal part 2 and the second metal part 3 after the material around the joint hole 31 is deformed into a state along the first inclined surface 24 and the second inclined surface 25. It is added from the first metal part 2 to the second metal part 3 in order to make the joint stronger.

Further, in the initial stage where the friction welding is performed by the first stage load F <b> 1, the surfaces of the first inclined surface 24 and the second inclined surface 25 in the first metal part 2, and the bonding holes 31 in the second metal part 3. The oxide film present on the inner wall surface is removed.
When the first-stage load F1 is applied from the first metal part 2 to the second metal part 3, the rotational speed V of the first metal part 2 is kept constant as friction welding, and the first metal part 2 is in a first state with respect to the second metal part 3. The metal part 2 is slid to generate frictional heat between the first metal part 2 and the second metal part 3. Thereafter, when the second stage load F2 is applied from the first metal part 2 to the second metal part 3, the rotation of the first metal part 2 can be stopped. In this case, from the first metal part 2 to the second metal part 3, only thrust without friction due to rotation is applied as the second stage load F <b> 2 as thrust pushing.

  When friction welding is performed, the second metal part 3 having a melting point lower than that of the first metal part 2 due to frictional heat generated between the first metal part 2 in the solid state and the second metal part 3 in the solid state. A part of the material is deformed. Further, due to frictional heat, a part of the material of the second metal part 3 is discharged as burrs (small metal pieces) from the base end side portion 241 of the first inclined surface 24 to the outside. The burr is discharged more when the second-stage load F2 is applied from the first metal part 2 to the second metal part 3.

As shown in FIG. 4, when friction welding and thrust pushing are performed between the first inclined surface 24 and the second inclined surface 25 and the joint hole 31, the inclination angle θ1 of the first inclined surface 24 and the second inclined surface The pressure component σ1 acting in the direction perpendicular to the first inclined surface 24 is larger than the pressure component σ2 acting in the direction perpendicular to the second inclined surface 25 due to the difference from the inclination angle θ2 of 25. More specifically, in the direction perpendicular to the first inclined surface 24, the pressure component σ 1 applied from the first inclined surface 24 to the material around the joint hole 31 is second in the direction perpendicular to the second inclined surface 25. It becomes larger than the pressure component σ2 applied to the material around the joining hole 31 from the inclined surface 25. Here, when the unit area where the load F (kN) acts on the second metal part 3 from the first metal part 2 is S (m ² ), the pressure components σ1 and σ2 are σ1 = F / S × cos ( 90 ° −θ1) and σ2 = F / S × cos (90 ° −θ2).

  Therefore, the diffusion energy for performing the friction welding generated between the first inclined surface 24 and the material around the bonding hole 31 is generated between the second inclined surface 25 and the material around the bonding hole 31. It becomes larger than the diffusion energy for performing friction welding. Thereby, in particular, the friction bonding between the proximal end portion 241 of the first inclined surface 24 located on the most proximal end D2 of the joint portion 23 and the joining hole 31 can be effectively performed. Further, a gap or the like that weakens the bonding strength can be prevented from being formed between the proximal end portion 241 of the first inclined surface 24 and the bonding hole 31.

  Further, when the second stage load F2 is applied from the first metal part 2 to the second metal part 3, the part 211 adjacent to the joint part 23 in the general shaft part 21 can be embedded in the joint hole 31. . In addition, this embedding applies a first-stage load F1 from the first metal part 2 to the second metal part 3, and follows the first inclined surface 24 and the second inclined surface 25 of the bonding portion 23 to form the bonding hole 31. It can also be performed when the inner wall surface is deformed. In these cases, the base end side portion 241 of the first inclined surface 24 is securely embedded in the joint hole 31, and a gap is less likely to be formed between the base end side portion 241 and the joint hole 31. Can do.

In the dissimilar material joining component 1 manufactured in this way, in particular, joining between the proximal end portion 241 of the first inclined surface 24 located on the most proximal side D2 of the joining portion 23 and the joining hole 31 is performed. There are no gaps that weaken the strength.
Therefore, according to the dissimilar material joining component 1 and the dissimilar material joining method of this embodiment, the joining strength between the first metal component 2 and the second metal component 3 can be effectively increased.

The plurality of inclined surfaces formed in the joint portion 23 can be formed in three or more stages in addition to the two stages of the first inclined surface 24 and the second inclined surface 25. In this case, the inclination angle as an acute angle with respect to the central axis C of the first metal component 2 is reduced as the inclined surface located on the distal end side D1 where the reduced diameter portion 22 is formed with respect to the general shaft portion 21. To do.
Further, the reduced diameter portion 22 of the first metal component 2 may be formed to have a length protruding through the joint hole 31 of the second metal component 3. In this case, the reduced diameter portion 22 is formed by the joint portion 23 having a plurality of inclined surfaces 24 and 25 and the general reduced diameter portion 22 having an outer diameter smaller than that of the general shaft portion 21.

In addition, a hollow hole along the central axis C may be formed at the center of the first metal component 2.
Further, instead of rotating the first metal component 2, the second metal component 3 can be rotated. Further, instead of applying the load F from the first metal part 2 to the second metal part 3, the load F can be applied from the second metal part 3 to the first metal part 2.
Further, when performing friction welding between the first metal part 2 and the second metal part 3, at least one of the first metal part 2 and the second metal part 3 is heated within a range in which the solid phase state is maintained. You can also

(Embodiment 2)
As shown in FIG. 5, this embodiment shows a case where the joint portion 23 joined to the joint hole 31 in the reduced diameter portion 22 has a curved inclined surface 26 that is recessed in a curved shape on the inner peripheral side.
The curved inclined surface 26 recessed in a curved shape can be considered as a case where the number of forming steps of the plurality of inclined surfaces 24 and 25 shown in the first embodiment is increased. As shown in FIG. 6, the inclination angle θ <b> 3 as the acute angle of the curved inclined surface 26 changes so as to approach the central axis C of the first metal part 2 as it approaches the distal end side D <b> 1. When the first metal part 2 and the second metal part 3 are joined by friction welding, the curved inclined surface 26 is applied by the load F applied between the first metal part 2 and the second metal part 3. The pressure component σ3 acting in the vertical direction becomes larger toward the base end side D2 of the curved inclined surface 26.

In this embodiment, as shown in FIG. 7, when the first metal part 2 is rotated and brought close to the second metal part 3, the tip side portion of the curved inclined surface 26 at the joint 23 of the first metal part 2 is applied. The proximal end side opening 311 of the joining hole 31 of the second metal part 3 comes into contact. When the first metal part 2 is pressed against the second metal part 3 while rotating relatively around the central axis C, the material around the joint hole 31 is deformed and curved. Not only the distal end portion of the inclined surface 26 but also the proximal end portion of the curved inclined surface 26 is brought into contact. Then, friction welding is performed between the curved inclined surface 26 and the material around the joining hole 31, and the material around the joining hole 31 is deformed so as to follow the curved inclined surface 26.
In this way, the inner wall surface of the joint hole 31 is first brought into contact with the distal end portion of the curved inclined surface 26 of the joint portion 23, and the range in which the inner wall surface of the joint hole 31 contacts the curved inclined surface 26 is the proximal end side. Enlarged to D2.

In this embodiment, as shown in FIG. 6, the pressure component σ3 acting in the direction perpendicular to the curved inclined surface 26 by the load F applied between the first metal component 2 and the second metal component 3 is a curved surface. Increases toward the proximal end D2 of the inclined surface 26. Therefore, the diffusion energy for performing the friction welding can be increased toward the base end side D2 of the curved inclined surface 26. In particular, the frictional joining between the proximal end portion 261 of the curved inclined surface 26 of the joint portion 23 and the joining hole 31 can be effectively performed, and the proximal end portion 261 of the curved inclined surface 26 and It is possible to prevent a gap or the like that weakens the bonding strength from being formed between the bonding hole 31 and the like.
Also in this embodiment, the other components of the dissimilar material bonding component 1 and the dissimilar material bonding method and the components indicated by the reference numerals in the drawing are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained. .

(Embodiment 3)
This form shows the dissimilar-material joining component 1 from which the shape of the 1st metal component 2 and the 2nd metal component 3 differs greatly from the case of Embodiment 1, 2 for reference. In the dissimilar material joining component 1 of this embodiment, as shown in FIG. 8, the first metal component 2 has a hollow hole 27, and the curved inclined surface 26 </ b> A in the joining portion 23 </ b> A is on the tip side D <b> 1 of the hollow hole 27. Adjacent to the inner diameter of the hollow hole 27, the diameter is increased.
The joint portion 23 </ b> A is formed at a position adjacent to the hollow hole 27 in the enlarged diameter portion 22 </ b> A formed so that the inner circumference is larger than the inner diameter of the hollow hole 27. In the joint portion 23A of the first metal component 2 of this embodiment, a curved inclined surface 26A that is recessed in a curved shape is formed on the outer peripheral side. The second metal part 3 also has a hollow hole 37, and the tip 32 of the second metal part 3 is joined to the joint 23A.

  As shown in FIG. 9, the inclination angle θ4 as an acute angle of the curved inclined surface 26A of the present embodiment also changes so as to approach the central axis C of the first metal component 2 toward the distal end side D1. When performing friction welding, the tip of the second metal part 3 is brought into contact with the curved inclined surface 26A, and the first metal part 2 and the second metal part 3 are joined in the same manner as in the above embodiments. be able to. At this time, the pressure component σ4 acting in the direction perpendicular to the curved inclined surface 26A due to the load F applied between the first metal component 2 and the second metal component 3 is the base end side of the curved inclined surface 26A. It gets bigger as you go to D2. Therefore, also in this embodiment, as shown in FIG. 8, in particular, the proximal end portion 262 of the curved inclined surface 26 </ b> A of the joint portion 23 </ b> A in the first metal component 2 and the distal end portion 32 of the second metal component 3. A gap or the like that weakens the bonding strength can be prevented from being formed therebetween.

In addition, instead of the curved inclined surface 26A, a plurality of inclined surfaces that are gradually inclined can be formed in the joint portion 23A. In this case, the inclination angle as an acute angle with respect to the central axis C of the 1st metal component 2 can be made small as the inclination surface located in the front end side D1 is a some inclined surface.
Also in this embodiment, the other components of the dissimilar material bonding component 1 and the dissimilar material bonding method and the components indicated by the reference numerals in the drawing are the same as those in the first and second embodiments, and the same effects as those in the first and second embodiments are obtained. Can be obtained.

  Further, the present invention is not limited only to the respective embodiments, and further different embodiments can be configured without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 Dissimilar-material joining component 2 1st metal component 21 General shaft part 22 Reduced diameter part 23 Joining part 24 1st inclined surface 25 2nd inclined surface 26 Curved-shaped inclined surface 3 2nd metal component 31 Joining hole

Claims (10)

A first metal component having a general shaft portion and a reduced diameter portion whose outer periphery is smaller than the general shaft portion;
A second metal part having a melting point lower than the melting point of the first metal part and having a joining hole joined to the reduced diameter part,
The joint portion joined to the joint hole in the reduced diameter portion is
A plurality of inclined surfaces that are inclined stepwise and have a smaller inclination angle as an acute angle with respect to the central axis of the first metal part as the inclined surface is located on the tip side where the reduced diameter portion is formed with respect to the general shaft portion. Or a dissimilar material joined part having a curved inclined surface that is recessed in a curved shape.   The joint includes a first inclined surface, a second inclined surface adjacent to the tip end side of the first inclined surface, and having a smaller inclination angle than an acute angle with respect to the central axis of the first inclined surface. The dissimilar-material joining component according to claim 1, comprising:   The dissimilar-material joining component according to claim 1 or 2, wherein the first metal component is made of an iron-based material containing iron, and the second metal component is made of an aluminum material containing aluminum.   The dissimilar-material joining component as described in any one of Claims 1-3 to which the part adjacent to the said junction part in the said general axial part other than the said junction part is joined to the said joint hole. A first metal part having a general shaft part, and a reduced diameter part whose outer periphery is smaller than the general shaft part, and a joint having a melting point lower than the melting point of the first metal part and the reduced diameter part being disposed A method of joining a second metal part having a hole,
In the reduced diameter portion, the outer periphery of the joint portion arranged in the joint hole is
A plurality of inclined surfaces that are inclined stepwise and have a smaller inclination angle as an acute angle with respect to the central axis of the first metal part as the inclined surface is located on the tip side where the reduced diameter portion is formed with respect to the general shaft portion. Or formed as a curved inclined surface recessed in a curved shape,
The first metal component is pressed against the second metal component while being relatively rotated about a central axis thereof, and the plurality of inclined surfaces or the curved inclined surface of the joint is followed. A dissimilar material joining method for joining the first metal part and the second metal part by deforming an inner wall surface of a joining hole.   The inner wall surface of the bonding hole is first brought into contact with the tip side portion of the curved inclined surface of the bonding portion, and the range in which the inner wall surface of the bonding hole contacts the curved inclined surface is the proximal end side. The dissimilar material joining method according to claim 5, wherein the dissimilar material joining method is performed.   The inner wall surface of the joint hole is first brought into contact with the inclined surface located on the distal end side of the plurality of inclined surfaces of the joint portion, and the range in which the inner wall surface of the joint hole comes into contact with the proximal end side The dissimilar material joining method according to claim 5, wherein the dissimilar material is expanded to an inclined surface.   The joint includes a first inclined surface, a second inclined surface adjacent to the tip end side of the first inclined surface, and having a smaller inclination angle than an acute angle with respect to the central axis of the first inclined surface. The dissimilar-material joining method as described in any one of Claims 5-7 which is a shape which has.   The said 1st metal component is comprised from the iron-type material containing iron, and the said 2nd metal component is comprised from the aluminum material containing aluminum, As described in any one of Claims 5-8. Dissimilar material joining method.   When the inner wall surface of the joint hole is deformed following the plurality of inclined surfaces or the curved inclined surface of the joint portion, a portion of the general shaft portion adjacent to the joint portion is placed in the joint hole. The dissimilar-material joining method as described in any one of Claims 5-9 embed | buried.

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