JP5900410B2 - Member joining method - Google Patents

Description

  The present invention relates to a method for joining members.

  For example, Patent Document 1 discloses a method of joining cylindrical metal members together by friction welding. In this joining method, both ends are joined by generating frictional heat on the joining surface by rotating at high speed around the central axis while pressing the end faces of the cylindrical metal member.

International Publication No. 2008/010265 Pamphlet

  When the abutting portion where the metal members abut each other has a rectangular frame shape in plan view, the metal members cannot be rotated and joined, and therefore it is conceivable to join the metal members by reciprocating linearly. 27A and 27B are diagrams for explaining the problem. FIG. 27A is an exploded perspective view before joining, FIG. 27B is a sectional view before joining, and FIG. 27C is a sectional view after joining.

  As shown in FIG. 27A, here, a case where the first member 101 and the second member 110 are joined by friction welding is illustrated. The first member 101 includes a side wall portion 102 having a rectangular frame shape in plan view, and a partition portion 103 disposed on the side wall portion 102 at equal intervals. The second member includes a bottom portion 111 having a rectangular shape in plan view and a side wall portion 112 having a rectangular frame shape in plan view that hangs down from the bottom portion 111.

  When friction welding is performed on such a rectangular member in plan view, as shown in FIG. 27 (b), the outer side of the first member 101 is restrained immovably by the fixing jig 120, and the side wall The upper end surface of the part 102 and the lower end surface of the side wall part 112 are abutted. Then, it can be considered that the first member 101 and the second member 110 are relatively reciprocated and joined in parallel with the longitudinal direction of the vertical side portion 105 of the side wall portion 102.

  As shown in FIG. 27C, since the outer side of the first member 101 is fixed by the fixing jig 120, when a stress in the thickness direction acts on the lateral side portion 106 of the first member 101 by friction welding. There is a problem that the tip of the lateral side portion 106 falls inward, resulting in poor bonding. Moreover, the outer surface of the 1st member 101 and the 2nd member 110 will be dented, and there exists a problem of having a bad influence also on designability etc.

  Further, for example, when the space surrounded by the side wall portion 102 and the partition portion 103 is used as a fluid flow path, there is a problem that the flow path is blocked by the fall of the lateral side section 106. Further, there is a problem that the flow path is blocked even when many burrs are generated on the inner surfaces of the side wall portions 102 and 112 due to friction welding.

  From such a viewpoint, it is an object of the present invention to provide a method for joining members that can prevent the side wall portion from falling and reduce burrs generated in the joint portion by friction welding.

  In order to solve such a problem, the present invention is a first side wall portion having a rectangular frame shape in plan view, which is composed of a pair of first vertical side portions having a plate shape and a pair of first horizontal side portions having a plate shape. A second member including a second side wall portion having a rectangular frame shape in plan view, and a first member having a pair of second vertical side portions having a plate shape and a pair of second horizontal side portions having a plate shape. A preparation step for preparing a member, the end surfaces of the first vertical side and the first horizontal side, and the end surfaces of the second vertical side and the second horizontal side, respectively, A friction welding process for reciprocating and moving in parallel with the longitudinal direction of the side part, and at least a part of the end face of the first lateral side part and at least a part of the end face of the second lateral side part In addition, at the start of the friction welding process, a spacing surface that is opposed with a gap is provided, and with the progress of the friction welding process, Serial spaced faces is characterized in that it is friction welding in contact.

  The present invention also includes a first member including a pair of first vertical side portions having a plate shape and a pair of first horizontal side portions having a plate shape, and a first side wall portion having a rectangular frame shape in plan view. A preparation step for preparing the second member; and the end surface of the first vertical side portion and the first horizontal side portion and the opening of the first member are closed by the second member and the end surface of the first member; A friction welding step of abutting opposing opposing surfaces and reciprocating in parallel with the longitudinal direction of the first vertical side to friction weld, and including at least a part of the end surface of the first horizontal side At least a part of the facing surface is provided with a spacing surface facing the spacing surface at the start of the friction welding process, and with the progress of the friction welding process, the spacing surfaces come into contact with each other to cause friction. It is characterized by being pressed.

  According to this method, on the side of the lateral side that receives stress in the thickness direction due to friction welding, a pair of separation surfaces that are separated at the start of friction welding and are brought into contact with the progress of friction welding are provided. As a result, the pair of spaced surfaces are rubbed behind each other, so that the frictional heat generated in the lateral side portion and the stress acting on these portions can be reduced. Therefore, the side wall portion can be prevented from falling down, and burrs generated at the joint portion can be reduced.

  Moreover, it is preferable that a notch part is provided in at least one of the end surface of the first lateral side portion and the end surface of the second lateral side portion to form the separation surface. In addition, it is preferable that a notch portion is provided on at least one of the end surface of the first lateral side portion and the facing surface to form the separation surface.

  According to this method, the separation surface can be easily formed.

  Moreover, it is preferable to set the notch height of the said notch part to 0.15 mm or more.

  According to this method, it is possible to more reliably suppress the falling of the side wall portion and reduce burrs generated at the joint portion.

  Moreover, it is preferable to chamfer at least one corner of the end surface of the first lateral side portion and the end surface of the second lateral side portion to form the separation surface. In addition, it is preferable that the separation surface is formed by chamfering at least one corner of the end surface of the first lateral side and the facing surface.

  According to this method, the separation surface can be easily formed.

  The chamfer height is preferably set to 1.0 mm or more.

  According to this method, it is possible to more reliably suppress the falling of the side wall portion and reduce burrs generated at the joint portion.

  Further, it is preferable that the method further includes a welding step of performing welding along the joint portion by friction welding using the burr generated in the friction welding step as a filler material after the friction welding step.

  According to this method, the outer surface of the joined member can be finished cleanly.

  According to the method for joining members according to the present invention, it is possible to prevent the side wall portion from falling down and reduce burrs generated at the joint portion by friction welding.

It is a disassembled perspective view of the hollow container which concerns on 1st embodiment of this invention. It is an enlarged plan view of the 1st member concerning a first embodiment. It is an enlarged view around the edge part of the 2nd member which concerns on 1st embodiment, Comprising: (a) It is a top view, (b) is a perspective view. It is sectional drawing of the hollow container which concerns on 1st embodiment. It is a figure which shows the butt | matching process of the joining method of the member which concerns on 1st embodiment, Comprising: (a) is a perspective view, (b) is the II arrow directional view of (a). (A) is the II-II arrow directional view of (b) of FIG. 5, (b) is the III arrow directional view of (a) of FIG. It is a disassembled perspective view of the hollow container which concerns on 2nd embodiment. It is a disassembled perspective view of the cylindrical body with a flange which concerns on 3rd embodiment. It is the perspective view which looked at the 2nd member concerning a third embodiment from the back side. It is a figure which shows the cylindrical body with a flange which concerns on 3rd embodiment, Comprising: (a) is a sectional side view, (b) is IV-IV sectional drawing of (a). It is a figure which shows the butt | matching process of the joining method of the member which concerns on 3rd embodiment, Comprising: (a) is a front view, (b) is a VV arrow line view of (a). It is a disassembled perspective view which shows the hollow container which concerns on 4th embodiment. It is a disassembled perspective view which shows the hollow container which concerns on 5th embodiment. It is sectional drawing which shows the butt | matching process of the joining method of the member which concerns on 5th embodiment. It is a disassembled perspective view which shows the hollow container with a flange which concerns on 6th embodiment. It is the perspective view which looked at the 2nd member concerning a 6th embodiment from the back side. It is a sectional side view which shows the butt | matching process of the joining method of the member which concerns on 6th embodiment. It is the perspective view which looked at the 2nd member concerning a seventh embodiment from the back side. It is a figure which shows Example A, (a) is a disassembled perspective view, (b) is a front view after having faced | matched. It is a sectional side view which shows the measuring method of the deformation amount of Example A. 10 is a table showing the results of Example A. 6 is a graph showing the results of Example A. It is a figure which shows Example B, Comprising: (a) is a disassembled perspective view, (b) is the front view after having faced | matched. It is a sectional side view after butting in Example B. 10 is a table showing the results of Example B. It is a graph which shows the result of Example B. It is a figure for demonstrating a subject, Comprising: (a) is a disassembled perspective view before joining, (b) is sectional drawing before joining, (c) is sectional drawing after joining.

[First embodiment]
A method for joining members according to a first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, in the method for joining members according to this embodiment, a case where a hollow container 1 is manufactured by joining metal members together is illustrated. For example, the hollow container 1 is used as a heat transfer member by flowing a fluid therein.

  The hollow container 1 includes a first member 2 and a second member 3. The material of the first member 2 and the second member 3 is not particularly limited as long as it is a metal or resin capable of friction welding, but in this embodiment, both use an aluminum alloy. Moreover, although the yield strength of the 1st member 2 and the 2nd member 3 is not restrict | limited in particular, In this embodiment, it sets so that the yield strength of the 2nd member 3 may become larger than the yield strength of the 1st member 2. FIG. That is, the second member 3 is less likely to be softened than the first member 2 during the friction welding process described later. First, the structure of the 1st member 2 and the 2nd member 3 before joining is demonstrated.

  The first member 2 includes a bottom portion 11 having a rectangular shape in plan view, a first side wall portion 12 having a rectangular frame shape standing on the bottom portion 11, and a plurality of partition portions 13 formed inside the first side wall portion 12. It consists of and. Although the molding method of the first member 2 is not particularly limited, in the present embodiment, the first side wall portion 12 and the partition portion 13 are integrally formed by extrusion molding, and then the bottom portion 11 is joined to the end portion of the molded product. .

  The first side wall portion 12 includes first vertical side portions 14 and 14 and first horizontal side portions 15 and 15. The first vertical sides 14 and 14 have a plate shape and are spaced apart from each other and arranged in parallel. The first lateral sides 15 and 15 have a plate shape and are spaced apart from each other and arranged in parallel. The first vertical side portion 14 is perpendicular to the first horizontal side portion 15. The upper end surface 14a of the first vertical side portion 14 and the upper end surface 15a of the first horizontal side portion 15 are flush with each other. As shown in FIG. 2, a virtual boundary surface (side end surface) 14 b of the first vertical side portion 14 is connected to a virtual boundary surface (side surface) 15 e of the first horizontal side portion 15.

As shown in FIG. 1, the upper end surface 15a is divided into three regions. In the butting process described later, surfaces that contact the lower end surface 25a are upper end surfaces 15a ₁ and 15a _1, and surfaces that are separated from the lower end surface 25a are upper end surfaces 15a ₂ .

  The partition portion 13 has a plate shape and is vertically connected to the first vertical side portions 14 and 14. A plurality of the partition portions 13 are arranged at equal intervals. A plurality of spaces formed by the first side wall portion 12 and the partition portion 13 are used as flow paths P, P,. The upper end surface 13a of the partition part 13 is flush with the upper end surfaces 14a and 15a.

  As shown in FIG. 1, the second member 3 includes a bottom portion 21 having a rectangular shape in plan view and a second side wall portion 22 having a rectangular frame shape in plan view that hangs down from the bottom portion 21. A concave portion Q composed of a bottom portion 21 and a second side wall portion 22 is formed inside the second member 3. Although the molding method of the second member 3 is not particularly limited, in the present embodiment, it is integrally molded by die casting.

  The second side wall portion 22 includes second vertical side portions 24 and 24 and second horizontal side portions 25 and 25. The second vertical side portions 24, 24 have a plate shape and are spaced apart from each other and arranged in parallel. The second lateral sides 25, 25 have a plate shape and are spaced apart from each other and arranged in parallel. The second vertical side portion 24 is perpendicular to the second horizontal side portion 25. The length and plate thickness of the second vertical side portion 24 are respectively equal to the length and plate thickness of the first vertical side portion 14. Further, the length and the plate thickness of the second lateral side portion 25 are equivalent to the length and the plate thickness of the first lateral side portion 15. As shown in FIG. 3A, the virtual boundary surface (side end surface) 24 b of the second vertical side portion 24 is connected to the virtual boundary surface 25 e of the second horizontal side portion 25.

  As shown in FIGS. 3 (a) and 3 (b), a notch 26 that is recessed in a rectangular cross section is formed at the center in the left-right direction on the lower end surface 25a of the second lateral side 25. . The notch 26 includes a bottom surface 26a and side surfaces 26b and 26b perpendicular to the bottom surface 26a. The width of the notch 26 is equal to the thickness of the second lateral side 25. The length of the notch 26 is equal to the length between the second vertical sides 24 and 24. The height of the notch 26 is appropriately set depending on the material of the second member 3 and the conditions of the friction welding process. For example, in the present embodiment, the height of the notch 26 is 0.15 mm. The lower end surface 24a of the second vertical side portion 24 and the lower end surface 25a of the second horizontal side portion 25 are flush with each other.

  FIG. 4 is a cross-sectional view of the hollow container according to the first embodiment. As shown in FIG. 4, in the hollow container 1, the first member 2 and the second member 3 are joined by friction welding. A weld metal W <b> 1 is formed over the outer periphery of the joint between the first member 2 and the second member 3. The weld metal W1 is a part formed by laser welding.

  Next, a method for joining members according to the present embodiment will be described. In the member joining method according to the present embodiment, a preparation process, a butt process, a friction welding process, and a welding process are performed.

  As shown in FIG. 1, the preparation process is a process of preparing the first member 2 and the second member 3. The forming method of the first member 2 and the second member 3 is not particularly limited.

As shown in FIGS. 5A and 5B, the butting process is a process in which the first member 2 and the second member 3 are butted. In the butting step, the upper end surfaces 14a and 14a of the first member 2 and the lower end surfaces 24a and 24a of the second member 3 are brought into surface contact. Further, the upper end surfaces 15 a ₁ and 15 a _{1 of} the first member 2 and the lower end surfaces 25 a and 25 a of the second member 3 are brought into surface contact. Further, the outer peripheral surface of the first side wall portion 12 of the first member 2 and the outer peripheral surface of the second side wall portion 22 of the second member 3 are flush with each other. Thereby, the butt | matching part J1 (hatched part of FIG.5 (b)) is formed.

As shown in FIGS. 6 (a) and 6 (b), the notch 26 is formed in the second lateral portion 25 of the second member 3 in the butting step, so that the upper end surface 15a ₂ and the bottom surface 26a Face each other with a slight gap. The upper end face 15a ₂ that faces the bottom surface 26a and the bottom surface 26a corresponds to the "separation plane" in the claims.

  In the friction welding process of the present embodiment, the first member 2 is fixed and the second member 3 is relatively moved. Therefore, in the butting process, the periphery of the first side wall portion 12 of the first member 2 is fixed by a fixing jig. Restrained to move.

  The friction welding process is a process of joining the first member 2 and the second member 3 by performing a friction process and a pressure welding process. In the friction process, the abutted first member 2 and second member 3 are pressed in a direction approaching each other. In the present embodiment, the first member 2 and the second member 3 are reciprocated relatively and linearly in parallel with the longitudinal direction of the first vertical side portion 14. In the present embodiment, the first member 2 is not moved, but only the second member 3 is linearly reciprocated.

In friction step according to the present embodiment, first, the upper end surface 14a and the lower end surface 24a and the upper end face 15a ₁ and the lower end surface 25a (abutting portion J1) and rubs intertwined with frictional heat is generated, it softened preform to the outside By discharging, the height of the part of the first side wall part 12 and the second side wall part 22 that are rubbed together gradually decreases. By reciprocating continues, the upper end surface in addition to the upper end surface 14a and the lower end surface 24a and the upper end face 15a ₁ and the lower end surface 25a (separation surface) 15a ₂ and the bottom surface (separation surface) 26a and rubs intertwined friction Heat is generated. In other words, friction step of spaced faces is performed little later than the friction step and the upper end surface 14a and the lower end surface 24a and the upper end face 15a ₁ and the lower end surface 25a.

  The conditions in the friction process may be set as appropriate. For example, the frequency is set to 100 to 260 Hz, the amplitude is set to 1.0 to 2.0 mm, and the friction pressure is set to 20 to 60 MPa. Moreover, the time of a friction process is set to about 5 to 10 seconds. When the friction process is completed, the process immediately proceeds to the pressure contact process.

  In the pressure contact process, the first member 2 and the second member 3 are pressed in directions approaching each other without relatively moving. The conditions in the pressure contact process may be set as appropriate. For example, the upset pressure is set to 60 to 80 MPa, and the time is set to about 3 to 5 seconds.

  After frictional heat is generated in the joint portion by the friction process, when reciprocation is stopped and an upset pressure is applied by the pressure contact process, an intermolecular attractive force acts on the joint portion, and the first member 2 and the second member 3 are coupled. In the friction process, burrs are generated by the softened base material being pushed out to the inside and outside of the joint.

  In the welding process, welding is performed using a burr formed on the outer surface of the joint between the first member 2 and the second member 3 as a filler material. The type of welding is not particularly limited, but laser welding is performed in this embodiment. In the welding process, other types of welding methods such as arc welding may be used. As described above, the hollow container 1 is formed.

According to the member joining method according to the present embodiment described above, the first lateral side 15 and the second lateral side are reciprocated in parallel with the longitudinal direction of the first longitudinal side 14 during the friction welding process. The side part 25 receives stress in the plate | board thickness direction. The second lateral side portion 25, since the notch 26 is formed, the upper end surface friction step between the bottom surface (separation surface) 26a of (spaced surface) 15a ₂ and notches 26, the upper end face 14a performed later than the friction step between the lower end surface 24a and the upper end face 15a ₁ and the lower end surface 25a. Therefore, the frictional heat generated in the second lateral side portion 25 and the stress acting on the second lateral side portion 25 can be reduced as compared with the case where the notched portion 26 is not provided. Thereby, the fall of the second lateral side portion 25 can be suppressed and the burrs generated at the joint portion can be reduced.

  Moreover, according to this embodiment, even if it reciprocates linearly, the 1st member 2 and the 2nd member 3 can be joined reliably, and the sealing performance of the hollow container 1 can be improved.

  Further, the moving direction of the friction welding process may be parallel to the longitudinal direction of the first horizontal side portion 15 or may be moved obliquely with respect to the first vertical side portion 14, but as in the present embodiment, Compared with the case of reciprocating in parallel with the longitudinal direction of the first horizontal side portion 15 by reciprocating in parallel with the longitudinal direction of the one vertical side portion 14, the contact area between the first member 2 and the second member 3 can be reduced. Since a large amount can be secured, friction welding can be performed stably.

  Moreover, according to the welding process, the outer surface of the hollow container 1 can be finished finely. Moreover, since a burr | flash is used as a filler material, material cost can be held down.

  In addition, in the joining method of the member which concerns on 1st embodiment, it is not limited to an above-described form, A design change is possible suitably. For example, the first sidewall portion 12 and the second sidewall portion 22 of the present embodiment have a shape with a large aspect ratio, but may be a rectangle with a small aspect ratio or a square.

  In the present embodiment, both the first member 2 and the second member 3 are metal members, but either one may be a resin member or both resin members. Moreover, in this embodiment, although the notch part 26 was provided only in the 2nd member 3, a notch part may be provided in both the 1st member 2 and the 2nd member 3, or only the 1st member 2 is provided. A notch may be provided.

  Further, in the present embodiment, by providing the notch portion 26 having a rectangular cross section, the pair of separation surfaces that come into contact with the progress of friction in the friction welding process are provided, but the present invention is not limited to this. The separation surface has any shape as long as the end faces are not in contact with each other at the start of the friction welding in the portion subjected to stress in the plate thickness direction during the friction welding, and contact with the progress of friction. May be. Further, when the reciprocating movement of the friction welding is set parallel to the longitudinal direction of the first horizontal side portion 15, a separation surface is provided on the upper end surface 14 a of the first vertical side portion 14 and the lower end surface 24 a of the second vertical side portion 24. What is necessary is just to provide.

[Second Embodiment]
Next, a method for joining members according to the second embodiment of the present invention will be described. As shown in FIG. 7, the member joining method according to the present embodiment is different from the first embodiment in that a notch 26 </ b> A is formed in the entire width direction of the second member 3 </ b> A. In description of the joining method of the member which concerns on this embodiment, it demonstrates centering on the part which is different from 1st embodiment.

  The 1st member 2 is the structure equivalent to 1st embodiment. The second member 3 </ b> A includes a bottom portion 21 having a rectangular shape in plan view and a second side wall portion 22 having a rectangular frame shape in a plan view hanging from the bottom portion 21. A concave portion Q composed of a bottom portion 21 and a second side wall portion 22 is formed inside the second member 3.

  The second side wall portion 22 includes second vertical side portions 24 and 24 and second horizontal side portions 25 and 25. In the longitudinal direction (left-right direction) of the second horizontal side portion 25, a notch portion 26A is formed over the entire length. The notch portion 26A includes a bottom surface 26Aa and side surfaces 26Ab and 26Ab perpendicular to the bottom surface 26Aa.

  Next, a method for joining members according to the second embodiment will be described. In the member joining method according to the present embodiment, a preparation process, a butt process, a friction welding process, and a welding process are performed.

  The preparation process is equivalent to the first embodiment. In the butting process, the first member 2 and the second member 3 are butted together. In the butting step, the upper end surfaces 14a and 14a of the first vertical side portion 14 and the lower end surfaces 24a and 24a of the second vertical side portion 24 are brought into surface contact. On the other hand, in the butting step, the upper end surface 15a of the first lateral side portion 15 and the bottom surface 26Aa of the second lateral side portion 25 face each other with a slight gap. The upper end surface 15a and the bottom surface 26Aa correspond to a “separation surface” in the claims.

  The friction welding process is a process of joining the first member 2 and the second member 3A by performing a friction process and a pressure welding process. In the friction process, the first member 2 and the second member 3A are pressed against each other while abutting each other. In the present embodiment, the first member 2 and the second member 3A are reciprocated relatively and linearly substantially parallel to the longitudinal direction of the first vertical side portion 14. In the present embodiment, the first member 2 is not moved, and only the second member 3A is linearly reciprocated.

  In the friction process according to the present embodiment, first, the upper end surface 14a and the lower end surface 24a (butting portion) are rubbed together to generate frictional heat, and the softened base material is discharged to the outside. The height of the part which is rubbed among 12 and the 2nd side wall part 22 becomes small. By continuously reciprocating, the upper end surface (separation surface) 15a and the bottom surface (separation surface) 26Aa are rubbed together in addition to the upper end surface 14a and the lower end surface 24a to generate frictional heat. That is, the friction process between the spaced surfaces is performed slightly later than the friction process between the upper end surface 14a and the lower end surface 24a.

  When the friction process is completed, the process immediately proceeds to the pressure contact process. The pressure welding process is the same as in the first embodiment. The welding process is also the same as that of the first embodiment.

  According to the member joining method according to the second embodiment described above, an effect substantially equivalent to that of the first embodiment can be obtained. Moreover, you may provide the notch part 26A in the whole left-right direction of 2nd member 3A like 2nd embodiment.

[Third embodiment]
Next, a method for joining members according to the third embodiment of the present invention will be described. In the member joining method according to the third embodiment, the shapes of the first member 2B and the second member 3B are different from those of the first embodiment, as shown in FIG. In the third embodiment, the flanged tubular body 1B is formed by joining the first member 2B and the second member 3B by friction welding.

  The first member 2 </ b> B includes a first side wall portion 12 having a rectangular frame shape in plan view and a plurality of partition portions 13. The first member 2B is different from the first embodiment in that the bottom part 11 is not provided. That is, the first member 2B communicates in the vertical direction.

  The second member 3B is different from the first embodiment in that the second member 3B includes a second side wall portion 22B having a rectangular frame shape in plan view and a flange 27 protruding outward from the outer surface of the second side wall portion 22B. A communication hole R communicating in the vertical direction is formed inside the second member 3. The communication hole R has a rectangular shape in plan view. The second side wall portion 22B is composed of second vertical side portions 24B, 24B and second horizontal side portions 25B, 25B. The second horizontal side portion 25B is connected to a virtual boundary surface (side end surface) of the second vertical side portions 24B and 24B.

  FIG. 9 is a perspective view of the second member according to the third embodiment as seen from the back. As shown in FIG. 9, the lower end surfaces 24Ba and 24Ba (the upper end surface in FIG. 9) of the second vertical side portion 24B are located on the same plane. A cutout portion 26B is formed on the lower end surface of the second horizontal side portion 25B. The notch 26B is formed over the entire lower end surface of the second lateral side 25B. The notch 26B is formed at a position that is one step higher than the lower end surface 24Ba (a position that is lowered in FIG. 9). The cutout portion 26B includes a bottom surface 26Ba and a side surface 26Bb perpendicular to the bottom surface 26Ba.

  As shown in FIGS. 8 and 9, the flange 27 includes first flanges 27a and 27a projecting in the left-right direction and second flanges 27b and 27b projecting in the front-rear direction.

  The first flange 27a has a plate shape and projects outward from the outer surface of the second vertical side portion 24B in the left-right direction. The first flange 27 a includes a main body portion 31 and thin plate portions 32 and 32 formed at the front and rear ends of the main body portion 31. The upper end surface of the main body 31 and the upper end surface of the thin plate portion 32 are flush with each other. The lower end surface of the thin plate portion 32 is flush with the bottom surface 26Ba of the notch portion 26B, and is formed at a position one step higher than the lower end surface of the main body portion 31.

  The second flange 27b has a plate shape and projects from the outer surface of the second lateral side portion 25B and the thin plate portion 32 to the front side and the rear side. The plate thickness of the second flange 27 b is equal to the plate thickness of the thin plate portion 32.

  (A), (b) of FIG. 10 is sectional drawing of the cylindrical body 1B with a flange which concerns on 3rd embodiment. As shown in FIG. 10, in the flanged tubular body 1B, the first member 2B and the second member 3B are joined by friction welding. A weld metal W2 is formed over the outer periphery of the joint between the first member 2B and the second member 3B. The weld metal W2 is a part formed by laser welding.

  In the present embodiment, the first member 2B has a cylindrical shape without providing a bottom portion, but may be provided with a bottom portion.

  Next, a method for joining members according to the third embodiment will be described. In the member joining method according to the present embodiment, a preparation process, a butt process, a friction welding process, and a welding process are performed.

  As shown in FIG. 8, the preparation step is a step of preparing the first member 2B and the second member 3B. The first member 2B is formed by extrusion molding. The second member 3B is integrally formed by die casting. In addition, you may make it the 2nd member 3 cut the lower end surface of a raw material, and form the notch part 26B.

  As shown in FIGS. 11A and 11B, the abutting step is a step of abutting the first member 2B and the second member 3B. In the butting step, the upper end surfaces 14a and 14a of the first member 2B and the lower end surfaces 24Ba and 24Ba of the second member 3B are brought into contact with each other to form the butting portion J2. A hatched portion in FIG. 11B is a butt portion J2.

  As shown in FIG. 11A, in the abutting step, the notch 26B is formed in the second member 3, so that a slight gap is formed between the upper end surface 15a and the bottom surface 26Ba of the notch 26B. Facing each other. The upper end surface 15a and the bottom surface 26Ba correspond to a “separation surface” in the claims.

  The friction welding process is a process of joining the first member 2B and the second member 3B by performing a friction process and a pressure welding process. In the friction process, the first member 2 </ b> B and the second member 3 </ b> B are pressed against each other while abutting each other. In the present embodiment, the first member 2 </ b> B and the second member 3 </ b> B are reciprocated relatively and linearly substantially parallel to the longitudinal direction of the first vertical side portion 14. In the present embodiment, the first member 2B is not moved, and only the second member 3B is linearly reciprocated.

  In the friction process according to the present embodiment, first, the upper end surface 14a and the lower end surface 24Ba (butting portion J2) are rubbed together to generate frictional heat, and the softened base material is discharged to the outside. The height of the part which is rubbed among the part 12 and the second side wall part 22B becomes small. By continuously reciprocating, the upper end surface (separation surface) 15a and the bottom surface (separation surface) 26Ba are rubbed together in addition to the upper end surface 14a and the lower end surface 24Ba, and frictional heat is generated. That is, the friction process between the separated surfaces is performed slightly later than the friction process between the upper end surface 14a and the lower end surface 24Ba.

  When the friction process is completed, the process immediately proceeds to the pressure contact process. The pressure welding process is the same as in the first embodiment. The welding process is also the same as that of the first embodiment.

  According to the member joining method according to the third embodiment described as described above, it is possible to obtain substantially the same effect as that of the second embodiment in which the notch portion is provided in the entire longitudinal direction of the lateral side portion. Moreover, the cylindrical body 1B with a flange connected to an up-down direction can be formed. By providing the flange 27 on the second member 3B, it is possible to improve the degree of freedom in assembling with the incidental member assembled on the second member 3B.

[Fourth embodiment]
Next, a method for joining members according to the fourth embodiment of the present invention will be described. As shown in FIG. 12, the joining method according to the present embodiment is different from the first embodiment in that the second member 3C has a plate shape. In description of the joining method of the member which concerns on this embodiment, it demonstrates centering on the part which is different from 1st embodiment.

  The second member 3 </ b> C includes a bottom portion 11 having a rectangular shape in plan view and a first side wall portion 12 having a rectangular frame shape in a plan view standing on the bottom portion 11. A hollow portion composed of a bottom portion 11 and a first side wall portion 12 is formed inside the second member 3C.

  The first side wall portion 12 includes first vertical side portions 14 and 14 and first horizontal side portions 15 and 15. The upper end surface 14a of the first vertical side portion 14 and the upper end surface 15a of the first horizontal side portion 15 are located on the same plane.

  The second member 3C has a rectangular plate shape in plan view. The second member 3 </ b> C is a member that closes the opening of the first side wall portion 12. The second member 3C includes a facing surface that faces the upper end surfaces 14a and 15a of the first member 2C. The second member 3 </ b> C has substantially the same size as the outer edge of the first side wall portion 12. In the second member 3C, a notch 26C is formed at a position corresponding to the first lateral portion 15 of the first member 2C. The notch 26C has a rectangular shape in cross section, and is formed with a bottom surface 26Ca and side surfaces 26Cb and 26Cb perpendicular to the bottom surface 26Ca.

  Next, a method for joining members according to the fourth embodiment will be described. In the member joining method according to the present embodiment, a preparation process, a butt process, a friction welding process, and a welding process are performed. Since the joining method of the member which concerns on 4th embodiment is substantially equivalent to 1st embodiment, description is abbreviate | omitted.

  According to the member joining method according to the fourth embodiment, the hollow container 1C can be manufactured by friction welding the first member 2C and the second member 3C. Since the notch portion 26C is provided, the first horizontal side portion 15 of the first member 2C can be prevented from falling down and burrs can be reduced on the same principle as in the first embodiment.

  In the present embodiment, the first member 2C has a plate shape, but may have any shape as long as the opening of the first side wall portion 12 is closed. In the present embodiment, the second member 3 </ b> C is opposed to the upper end surface of the first side wall portion 12, but the second member 3 </ b> C may be opposed to the lower end surface of the first side wall portion 12.

[Fifth embodiment]
Next, a method for joining members according to the fifth embodiment of the present invention will be described. As shown in FIG. 13, the member joining method according to the present embodiment is different from the first embodiment in that a chamfered portion 26 </ b> D is formed on the second member 3 </ b> D. In description of the joining method of the member which concerns on this embodiment, it demonstrates centering on the part which is different from 1st embodiment.

1st member 2D is the structure equivalent to 1st embodiment. The upper end surface 15a is divided into two regions. The surface in contact with the lower end surface 25Da in abutting step described later and the upper end surface 15a _1, and the upper end face 15a ₂ of the plane away from the lower end surface 25Da.

  The second member 3D includes a bottom portion 21D having a rectangular shape in plan view and a second side wall portion 22D having a rectangular frame shape in plan view that hangs down from the bottom portion 21D. A recess Q composed of a bottom 21D and a second side wall 22D is formed inside the second member 3D.

  The second side wall portion 22D includes second vertical side portions 24D and 24D and second horizontal side portions 25D and 25D. A chamfered portion 26D formed by C-chamfering is formed at a corner portion constituted by the lower end surface 25Da and the outer surface 25Dc in the second horizontal side portion 25D. The chamfered surface 26Da of the chamfered portion 26D is provided over the entire length of the second horizontal side portion 25 in the longitudinal direction (left-right direction).

  Next, a method for joining members according to the fifth embodiment will be described. In the member joining method according to the present embodiment, a preparation process, a butt process, a friction welding process, and a welding process are performed.

  The preparation process is the same as that of the first embodiment except that chamfering is performed. The chamfered portion 26D may be integrally formed by die casting, or may be formed by performing C chamfering on the shaped material.

In the butting process, as shown in FIG. 14, the first member 2D and the second member 3D are butted together. The butt step, while the lower end surface 24Da in surface contact with the upper end face 14a and a second vertical side portion 24D of the first vertical side portion 14, and the upper end surface 15a ₁ of the first lateral side portion 15 second lateral side portion 25D The lower end surface 25Da of the surface contacts with each other to form a butt portion J3.

Also, the second member 3D, since the chamfered portion 26D is formed, the butt step, opposed with a gap to the upper end face 15a ₂ and the chamfered surface 26da. The upper end face 15a ₂ facing the chamfered surfaces 26Da and the chamfered surface 26Da corresponds to the "separation plane" in the claims.

The friction welding process is performed by the same method as in the first embodiment. The friction step, firstly, that the frictional heat is generated is rubbed upper end surface 14a and the lower end surface 24Da and the upper end surface 15a ₁ and the lower end surface 25 Da (butt portion J3), softened preform is discharged to the outside, Of the first side wall part 12 and the second side wall part 22D, the height of the parts that are rubbed together gradually decreases. By advancing the friction step, the upper end surface (separation surface) 15a ₂ and the chamfered surface (separation surface) 26da and is being rubbed, the contact area between the first member 2D and the second member 3D is gradually increased.

Friction steps may be carried out until all of the chamfered surface 26Da upper end surface 15a ₂ contacts, in the present embodiment performs the friction step to about one half of the upper end surface 15a ₂ and the chamfered surface 26Da contacts. And a press-contact process is performed by the method equivalent to 1st embodiment.

  In the welding process, laser welding is performed along the joint using the burr discharged around the joint in the friction welding process as a filler material. Thereby, the hollow container 1D is formed.

Even if the chamfered portion 26D is formed as in the fifth embodiment described above, the same effect as that of the first embodiment can be obtained. In the friction welding process in the fifth embodiment, since the second member 3D has a greater proof stress than the first member 2D and is less likely to soften, the lower end surface 25Da of the second member 3D is the upper end surface 15a ₁ of the first member 2D. Friction welding is performed so as to enter. For this reason, the fall of the 1st side part 15 can be prevented more. Also, if the burrs are discharged by friction welding process, it is possible to prevent for can hold burrs between the upper end face 15a ₂ and the chamfered portion 26D, the burrs bulges on the outer surface of the hollow container 1D.

  In the present embodiment, the chamfered portion 26D is formed only on the second member 3D, but may be provided only on the first member 2D, or may be provided on both the first member 2D and the second member 3D. . In the present embodiment, the chamfered portion 26D is provided only on the outer side of the first member 2D and the second member 3D, but may be provided only on the inner side, or may be provided on both the outer side and the inner side.

  Further, in the case where the second member has a plate shape as in the fourth embodiment, a chamfered portion may be provided at at least one corner of the first member and the second member.

[Sixth embodiment]
Next, a method for joining members according to the sixth embodiment of the present invention will be described. As shown in FIG. 15, the joining method of the member which concerns on 6th embodiment is a form close to 3rd embodiment, Comprising: The hollow container 1E with a flange is manufactured. In the present embodiment, the configuration of the notch 26E is different from that of the third embodiment.

  The first member 2 </ b> E includes a bottom portion 11 having a rectangular shape in plan view, a first side wall portion 12 having a rectangular frame shape in plan view, and a plurality of partition portions 13.

  The second member 3E includes a second side wall portion 22E having a rectangular frame shape in plan view and a flange 27 projecting outward from the outer surface of the second side wall portion 22E. A communication hole R that communicates in the vertical direction is formed inside the second member 3E. The communication hole R has a rectangular shape in plan view. The second side wall portion 22E is composed of second vertical side portions 24E and 24E and second horizontal side portions 25E and 25E. The second horizontal side portion 25E is connected to a virtual boundary surface (side end surface) of the second vertical side portions 24E and 24E.

  FIG. 16 is a perspective view of the second member according to the sixth embodiment viewed from the back. As shown in FIG. 16, the lower end surfaces 24Ea and 24Ea (the upper end surface in FIG. 9) of the second vertical side portion 24E and the lower end surfaces 25Ea and 25Ea of the second horizontal side portion 25E are located on the same plane. doing. A notch 26E is formed in the center of the lower end surface 25Ea of the second lateral side 25E.

  The notch 26E is composed of a bottom surface 26Ea, a notch surface 26Eb, and side surfaces 26Ec and 26Ec. The bottom surface 26Ea is formed at a position that is one step higher than the lower end surface 25Ea (a position that is lowered in FIG. 16). The notch surface 26Eb is formed as a curved surface that protrudes toward the first member 2E from the lower end surface 25Ea to the bottom surface 26Ea. The side surfaces 26Ec and 26Ec are formed perpendicular to the bottom surface 26Ea.

  As shown in FIG. 16, the flange 27 includes first flanges 27a and 27a projecting in the left-right direction and second flanges 27b and 27b projecting in the front-rear direction. The notch 26E is formed by vertically cutting the center of the second flange 27b.

  Next, a method for joining members according to the sixth embodiment will be described. In the member joining method according to the present embodiment, a preparation process, a butt process, a friction welding process, and a welding process are performed.

As shown in FIG. 15, the preparation step is a step of preparing the first member 2E and the second member 3E. As shown in FIG. 17, in the butting process, the first member 2E and the second member 3E are butted together. In the butting step, the butted portions J4 are formed by bringing the upper end surfaces 14a and 14a, the lower end surfaces 24Ea and 24Ea, the upper end surfaces 15a ₁ and 15a ₁ and the lower end surfaces 25Ea and 25Ea into surface contact.

Also, the second member 3E, since it is formed notched face 26Eb, the butt step, opposed with a gap to the upper end face 15a ₂ and notched face 26Eb. The upper end face 15a ₂ which faces the notch face 26Eb and the notched face 26Eb corresponds to the "separation plane" in the claims.

The friction welding process is performed by the same method as in the first embodiment. Friction step, first, that the frictional heat is generated is rubbed upper end surface 14a and the lower end face 24Ea and the upper end surface 15a ₁ and the lower end face 25Ea (butt portion J4), softened preform is discharged to the outside The height of the part of the first sidewall portion 12 and the second sidewall portion 22E that are rubbed together gradually decreases. By advancing the friction step, the upper end surface (separation surface) 15a ₂ and notched face 26Eb (separation surface) of the being rubbed, the contact area between the first member 2E and the second member 3E gradually increases. And a press-contact process is performed by the method equivalent to 1st embodiment.

  In the welding process, laser welding is performed along the joint using the burr discharged around the joint in the friction welding process as a filler material. Thereby, the hollow container 1E with a flange is formed.

  As in the sixth embodiment described above, the same effect as that of the first embodiment can be obtained even if the cut surface 26Eb of the cut portion 26E is a curved surface.

[Seventh embodiment]
Next, a method for joining members according to the seventh embodiment of the present invention will be described. As shown in FIG. 18, the member joining method according to the present embodiment is different from the sixth embodiment in the configuration of the notch portion 26F of the second member 3F. In the description of the joining method of the members according to the present embodiment, the description will focus on parts that are different from the sixth embodiment.

  The cutout portion 26E of the sixth embodiment shown in FIG. 16 is provided only at the center in the left-right direction of the second lateral side portion 25E and the second flange 27b, but the cutout portion of the seventh embodiment shown in FIG. Like 26F, you may form over the whole left-right direction of the 2nd horizontal side part 25F, the 1st flange 27a, and the 2nd flange 27b. The cutout portion 26F includes a bottom surface 26Fa and a cutout surface 26Fb. The notch surface 26Fb is a curved surface from the bottom surface 26Fa to the lower end surface 25Fa of the second horizontal side portion 25F.

  As in the seventh embodiment, the same effect as in the sixth embodiment can be obtained by providing the notch 26F with a curved surface in the width direction (left-right direction) of the second member 3F.

  In the friction welding process, when the time of the friction process or the pressure welding process is set long, or the friction pressure and the upset pressure are set high, many burrs are generated at the joint. In such a case, a “separation surface” may also be provided on the vertical side portion. Thereby, since the frictional heat of a vertical side part can be made low, the burr | flash which generate | occur | produces in a vertical side part can be decreased.

  Next, examples will be described. In Examples, two types of Examples A and B were performed by changing the shape of the notch.

[Example A]
In Example A, as shown in FIG. 19A, the first member 2G and the second member 3G were joined by friction welding to produce a hollow container 1G, and the deformation after joining was measured.

  The first member 2G includes a bottom portion 11 having a rectangular shape in plan view and a first side wall portion 12 having a rectangular frame shape in plan view. The first side wall portion 12 includes first vertical side portions 14 and 14 and first horizontal side portions 15 and 15. In the first member 2G, a flow path P constituted by the bottom 11 and the first side wall 12 is formed. The first member 2G has a length of 150 mm, a width of 10 mm, and a height of 10 mm.

  The plate thickness t1 of the first vertical side portion 14 of the first member 2G is 1.6 mm, and the plate thickness t2 of the first horizontal side portion 15 is 2.8 mm. The first member 2G uses aluminum alloy A1050-H112 (JIS).

  JIS: A1050 is Si: 0.25% or less, Fe: 0.40% or less, Cu: 0.05% or less, Mn: 0.05% or less, Mg: 0.05% or less, Zn: 0.05 % Or less, V; 0.05% or less, Ti; 0.03% or less, Al; 99.50% or more. H112 means that in the wrought material, mechanical properties are guaranteed in the state of manufacture without aggressive work hardening.

  The second member 3G includes a bottom portion 21 having a rectangular shape in plan view and a second side wall portion 22 having a rectangular frame shape in plan view. The second side wall portion 22 includes second vertical side portions 24 and 24 and second horizontal side portions 25 and 25. The second member 3G is formed with a concave portion Q composed of a bottom portion 21 and a second side wall portion 22. The second member 3G has a length of 150 mm, a width of 10 mm, and a height of 10 mm.

  The plate thickness t1 of the second vertical side portion 24 of the second member 3G is 1.6 mm, and the plate thickness t2 of the second horizontal side portion 25 is 2.8 mm. The second member 3G uses an aluminum alloy ADC12 (JIS). The material of the second member 3G is set to have a greater yield strength than the material of the first member 2G.

  JIS: ADC12: Cu; 1.5 to 3.5%, Si; 9.6 to 12.0%, Mg; 0.3% or less, Zn; 1.0% or less, Fe; 1.3% or less Mn: 0.5% or less, Ni: 0.5% or less, Ti: 0.3% or less, Pb: 0.2% or less, Sn: 0.2% or less, Al: balance.

  As shown in FIGS. 19A and 19B, a cutout portion 26 having a rectangular cross section is formed at the center of the second lateral side portion 25. The notch 26 includes a bottom surface 26a and side surfaces 26b and 26b perpendicular to the bottom surface 26a. In Example A, three types of second members 3G in which the notch height (height of the side surface 26b) h1 of the second member 3 was set to 0.10 mm, 0.15 mm, and 0.20 mm were prepared and joined to each other. .

  In the manufacturing method of the hollow container 1G, a preparation process, a butting process, and a friction welding process were performed. Each process is equivalent to 1st embodiment. As shown in FIG. 20, in Example A, the inner surface deformation amount M1 and the outer surface deformation amount M2 after the friction welding process was completed were measured. The inner surface deformation amount M1 is a distance from the inner surface (reference surface) 25d of the second lateral side portion 25 before the friction welding to the tip of the burr S after the friction welding. That is, the deformation amount M1 means the sum of the height of the burr S and the amount of collapse of the first lateral side portion 15.

  The deformation amount M2 of the outer surface is a distance from the outer surface (reference surface) 25c of the second lateral side portion 25 before the friction welding to the tip of the burr S after the friction welding. That is, the deformation amount M2 means the sum of the height of the burr S and the amount of collapse of the first lateral side portion 15. The amount of deformation was positive if it was more convex than the outer surface 25c and inner surface 25d, and negative if it was concave. That is, a numerical value close to 0 regardless of plus or minus means that the deformation amount is small. In this embodiment, the deformation range is set to ± 0.5 mm as the threshold range.

  FIG. 21 is a table showing the results of Example A. FIG. 22 is a graph showing the results of Example A. As shown in FIGS. 21 and 22, it was found that the deformation amount M1 of the inner surface exceeds the threshold range in the comparative example. That is, when the notch height h1 is 0.10 mm, the deformation amount of the first lateral side portion 15 increases, and the flow path (space) of the hollow container 1G tends to be narrowed.

  On the other hand, in Examples 1 and 2, it was found that both the inner surface deformation amount M1 and the outer surface deformation amount M2 were within the threshold range. That is, when the cutout height h1 of the cutout portion 26 is 0.15 mm or more, the first horizontal side portion 15 is not easily collapsed and the occurrence of burrs S is also reduced.

  In addition, when providing a notch part in both the 1st member 2G and the 2nd member 3G, it is preferable that the sum total of the height of each notch part is 0.15 mm or more.

[Example B]
In Example B, as shown in FIGS. 23A and 23B, the first member 2H and the second member 3H are joined by friction welding to produce a hollow container 1H. It was measured.

  The first member 2H is equivalent to the first member 2G of Example A. The second member 3 </ b> H includes a bottom portion 21 having a rectangular shape in plan view and a second side wall portion 22 having a rectangular frame shape in plan view. The second side wall portion 22 includes second vertical side portions 24 and 24 and second horizontal side portions 25 and 25. The second member 3 </ b> H is formed with a recess Q composed of a bottom portion 21 and a second side wall portion 22.

  The second member 3H has a length of 150 mm, a width of 10 mm, and a height of 10 mm. The second member 3H uses an aluminum alloy ADC12 (JIS).

  A chamfered portion 26D by C chamfering is formed at a corner portion between the lower end surface 25a and the outer surface 25c of the second horizontal side portion 25. As shown in FIG. 24, when the first member 2H and the second member 3H are brought into contact with each other, the upper end surface 15a of the first member 2H and the lower end surface 25a of the second member 3H come into contact with each other, and the upper end surface 15a and the chamfered surface 26 Da opposes with a gap. The angle formed by the upper end surface 15a and the chamfered surface 26Da is about 40 °. In Example B, three types of second members 3H, in which the notch height h2 of the chamfered portion 26D was set to 0.5 mm, 0.8 mm, and 1.0 mm, were prepared and joined to each other. The notch height h2 means the height from the lower end surface 25a to the outer end portion of the chamfered portion 26D.

  The joining method of the hollow container 1H is the same as that of Example A. In Example B, the deformation amount M1 of the inner surface and the deformation amount M2 of the outer surface after the friction welding process was completed were measured. The method for measuring the deformation is the same as in Example A.

  As shown in FIGS. 25 and 26, in the first and second comparative examples, the inner surface deformation amount M1 exceeds the threshold range. That is, when the notch height h2 is 0.8 mm or less, the deformation amount of the first lateral side portion 15 increases, and the flow path (space) of the hollow container 1H tends to be narrowed.

  On the other hand, in Example 1, both the inner surface deformation amount M1 and the outer surface deformation amount M2 are smaller than those in the comparative example, and are included in the threshold range. In other words, when the notch height h2 is 1.0 mm or more, the first horizontal side portion 15 is less inclined and the occurrence of burrs S is also reduced.

DESCRIPTION OF SYMBOLS 1 Hollow container 2 1st member 3 2nd member 11 Bottom part 12 1st side wall part 13 Partition part 14 1st vertical side part 15 1st horizontal side part 21 Bottom part 22 2nd side wall part 24 2nd vertical side part 25 2nd horizontal side Side 26 Notch

Claims (9)

A first member including a pair of first vertical sides having a plate shape and a pair of first horizontal sides having a plate shape and having a first side wall portion having a rectangular frame shape in plan view, and a pair having a plate shape A preparatory step of preparing a second member having a second side wall portion having a rectangular frame shape in plan view, the second vertical side portion and a pair of second horizontal side portions having a plate shape;
The end surfaces of the first vertical side portion and the first horizontal side portion are matched with the end surfaces of the second vertical side portion and the second horizontal side portion, respectively, and reciprocate in parallel with the longitudinal direction of the first vertical side portion. A friction welding process of moving and friction welding,
At least a part of the end surface of the first lateral side part and at least a part of the end surface of the second lateral side part are provided with a spacing surface facing each other with a gap at the start of the friction welding process. As the friction welding process proceeds, the separated surfaces are brought into contact with each other and friction welding is performed. A first member comprising a pair of first vertical sides having a plate shape and a pair of first horizontal sides having a plate shape and having a first side wall portion having a rectangular frame shape in plan view; and a second member. A preparation process to prepare; and
The second member is configured to butt the end surfaces of the first vertical side portion and the first horizontal side portion with the facing surface facing the end surface of the first member while closing the opening of the first member. A friction welding process of reciprocating in parallel with the longitudinal direction of the vertical side portion and friction welding,
At least a part of the end surface of the first lateral side part and at least a part of the opposed surface are provided with spaced surfaces that are opposed to each other with a gap at the start of the friction welding process, As the process proceeds, the separation surfaces come into contact with each other and are friction welded.   The member joining method according to claim 1, wherein a notch portion is provided on at least one of an end surface of the first lateral side portion and an end surface of the second lateral side portion to form the separation surface. .   The member joining method according to claim 2, wherein a notch portion is provided on at least one of the end surface of the first lateral side portion and the facing surface to form the separation surface.   The method for joining members according to claim 3 or 4, wherein a notch height of the notch is set to 0.15 mm or more.   2. The member joining method according to claim 1, wherein at least one corner of the end surface of the first lateral side portion and the end surface of the second lateral side portion is chamfered to form the separation surface. .   The method for joining members according to claim 2, wherein the spacing surface is formed by chamfering at least one corner of the end surface of the first lateral side portion and the facing surface.   The method for joining members according to claim 6 or 7, wherein a height of the chamfer is set to 1.0 mm or more.   9. The welding method according to claim 1, further comprising a welding step of performing welding along a joint portion by friction welding using the burr generated in the friction welding step as a filler material after the friction welding step. The method for joining members according to claim 1.

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