JP7078515B2 - Dissimilar material joining method, dissimilar material joining joint, tubular member with auxiliary member for dissimilar material joining, and its manufacturing method - Google Patents

Description

The present invention relates to a dissimilar material joining method, a dissimilar material joining joint, a tubular member with an auxiliary member for dissimilar material joining, and a method for manufacturing the same. , Dissimilar material joint joint, tubular member with auxiliary member for dissimilar material joint, and manufacturing method thereof.

For example, in order to improve the fuel efficiency of transportation equipment such as automobiles, the weight of the vehicle body is being reduced. As for weight reduction, there is a means of replacing steel, which is currently the mainstream, with aluminum alloys, magnesium alloys, carbon fibers, etc., which are lightweight materials. However, in order to replace all of them with these lightweight materials, there are problems such as high cost and insufficient strength, and as a solution, a design method called multi-material that combines steel and lightweight materials in the right place. Is in the spotlight.

In order to combine steel and the above lightweight materials, there will inevitably be places to join them. It is known that welding, which is easy between steels, aluminum alloys, and magnesium alloys, is extremely difficult with different materials. The reason for this is that an intermetallic compound (IMC), which is extremely brittle, is formed in the melt-mixed portion of steel and aluminum or magnesium, and the melt-mixed portion is easily broken by external stress such as tension or impact. .. For this reason, welding methods such as resistance spot welding and arc welding cannot be adopted for joining dissimilar materials, and other joining methods are generally used. Welding cannot also be used to join steel and carbon fiber because the latter is not a metal.

An example of the conventional dissimilar material joining technique is a means of providing through holes in both a steel material and a lightweight material and restraining them from above and below with bolts and nuts. Further, as another example, a means of inserting a caulking member from one side by applying a strong pressure and restraining it by a caulking effect is known (see, for example, Patent Document 1).

Further, as a portion for joining the steel material and the lightweight material, in addition to the case where the flat plates are joined together, the tubular member and the flat plate may be joined.

On the other hand, in Patent Document 2, in a state where an aluminum pipe is inserted into a hole of a plate-shaped steel part and rubber is further inserted into the aluminum pipe, both ends of the rubber are compressed to expand and deform the aluminum pipe. The technology for joining aluminum pipes to steel parts is disclosed.
Further, in Patent Document 3, a cylindrical member is inserted into an opening of a steel wall, an elastic body arranged inside the tubular member is compressed in the axial direction, and the tubular member is expanded in two stages. The tubular member and the wall are joined.

Japanese Unexamined Patent Publication No. 2002-174219 Japanese Unexamined Patent Publication No. 2016-147309 U.S. Pat. No. 4,320,568

By the way, in the case of the joining method described in Patent Documents 2 and 3, it is necessary to form an opening in the steel plate part in advance, and at the joining site, a joining device having a rubber or an elastic body is required, and the joining work at the site is required. Can be complicated.

The present invention has been made in view of the above matters, and an object thereof is a dissimilar material joining method and a dissimilar material that can easily and surely join members made of different metal materials at low cost and can be applied to a wide range of fields. It is an object of the present invention to provide a joint, a tubular member with an auxiliary member for joining dissimilar materials, and a method for manufacturing the same.

The above object of the present invention is achieved by the configuration of the following (1) according to the method for joining dissimilar materials.
(1) In a dissimilar material joining method in which a tubular first member made of a first metal material and a second member made of a second metal material different from the first metal material are joined.
A tubular auxiliary member made of a third metal material different from the first metal material, and one of the auxiliary members and the first member around the inner member of any one of the first members. And the process of arranging the outer members of
A step of caulking and joining the first member and the auxiliary member by expanding a part of the peripheral wall of the inner member to the outside in the radial direction by expanding the tube.
A step of joining the first member and the second member via the auxiliary member by welding the auxiliary member and the second member.
Dissimilar material joining method having.

Further, preferred embodiments of the present invention relating to a method for joining dissimilar materials relate to the following (2) to (5).
(2) In the tube expansion process, an elastic body is inserted inside the inner member in which the outer member is arranged, and the elastic body is compressed in the axial direction, thereby forming a part of the peripheral wall of the inner member in diameter. The dissimilar material joining method according to (1), which bulges outward in the direction.
(3) The outer member is provided with a plurality of holes along the circumferential direction.
In the tube expansion process, a plurality of balls are arranged inside the inner member corresponding to the plurality of holes, and the contact portion has a contact portion that abuts on the plurality of balls, and the corresponding contact portion is centered along the axial direction. By displacing the extruded member gradually separated from the shaft in the axial direction, the plurality of balls are moved radially outward of the inner member, and a part of the peripheral wall of the inner member facing the plurality of holes is radially displaced. The dissimilar material joining method according to (1), which bulges outward.
(4) The inner member is the first member, and the outer member is the auxiliary member.
The auxiliary member has a hole or an inward groove formed therein, and has a hole or an inward groove.
The dissimilar material joining according to any one of (1) to (3), wherein the caulking joint is performed by fitting a part of the peripheral wall of the first member into the hole or the inward groove. Method.
(5) The first metal material is either an aluminum alloy or a magnesium alloy, or a steel material.
The dissimilar material joining method according to any one of (1) to (4), wherein the second and third metal materials are made of either the aluminum alloy or the magnesium alloy and the steel, whichever is the other.

Further, the above object of the present invention is achieved by the configuration of the following (6) relating to the dissimilar material joint.
(6) A tubular first member made of a first metal material and a second member made of a second metal material different from the first metal material and joined to the first member. In the dissimilar material joints that have
A tubular auxiliary member made of a third metal material different from the first metal material is provided.
The inner member, which is either one of the auxiliary member and the first member, has a bulging portion in which a part of the peripheral wall thereof bulges outward in the radial direction, so that the auxiliary member and the first member have a bulge. Caulked to one of the other outer members,
A dissimilar material joint in which the auxiliary member and the second member are welded.

Further, a preferred embodiment of the present invention relating to a dissimilar material joint is related to the following (7) to (9).
(7) The inner member is the first member, and the outer member is the auxiliary member.
The auxiliary member has a hole or an inward groove formed therein, and has a hole or an inward groove.
The dissimilar material joint according to (6), wherein a part of the peripheral wall of the first member is fitted into the hole or the inward groove.
(8) The auxiliary member is provided with a plurality of holes along the circumferential direction.
The dissimilar material joint according to (7), wherein the first member has a plurality of the bulging portions fitted into the plurality of holes.
(9) The first metal material is either an aluminum alloy or a magnesium alloy, or a steel material.
The dissimilar material joint according to any one of (6) to (8), wherein the second and third metal materials are made of either the aluminum alloy or the magnesium alloy and the steel, whichever is the other.

Further, the above object of the present invention is achieved by the configuration of the following (10) relating to a tubular member with an auxiliary member for joining dissimilar materials.
(10) A tubular member with an auxiliary member for joining different materials, comprising a tubular member made of a metal material and a tubular auxiliary member made of a metal material different from the metal material of the tubular member and fitted with the tubular member. ,
The inner member of either the auxiliary member or the tubular member has a bulging portion in which a part of the peripheral wall thereof bulges outward in the radial direction, so that the auxiliary member and the tubular member are outside of the other. A tubular member with an auxiliary member for joining dissimilar materials that is caulked to the member.

Further, preferred embodiments of the present invention relating to a tubular member with an auxiliary member for joining dissimilar materials relate to the following (11) to (13).
(11) The inner member is the tubular member, and the outer member is the auxiliary member.
The auxiliary member has a hole or an inward groove formed therein, and has a hole or an inward groove.
The tubular member with an auxiliary member for joining different materials according to (10), wherein a part of the peripheral wall of the tubular member is fitted into the hole or the inward groove.
(12) The auxiliary member is provided with a plurality of through holes constituting the hole along the circumferential direction.
The tubular member has a plurality of the bulges that are fitted into the plurality of through holes.
The tubular member with an auxiliary member for joining different materials according to (11), wherein the protruding height of the plurality of bulging portions is equal to or less than the wall thickness of the auxiliary member.
(13) The metal material of the tubular member is either an aluminum alloy or a magnesium alloy, or a steel material.
The tubular with an auxiliary member for joining dissimilar materials according to any one of (10) to (12), wherein the metal material of the auxiliary member is one of the aluminum alloy or the magnesium alloy and the steel, whichever is the other. Element.

Further, the above object of the present invention is achieved by the following configuration (14) relating to a method for manufacturing a tubular member with an auxiliary member for joining dissimilar materials.
(14) A method for manufacturing a tubular member with an auxiliary member for joining different materials, comprising a tubular member made of a metal material and a tubular auxiliary member made of a metal material different from the metal material of the tubular member and fitted with the tubular member. And
A step of arranging the outer member of either the auxiliary member or the tubular member around the inner member of either the auxiliary member or the tubular member.
A tubular member with an auxiliary member for joining dissimilar materials, which comprises a step of caulking and joining the tubular member and the auxiliary member by expanding a part of the peripheral wall thereof radially outward by expanding the inner member. Production method.

Further, preferred embodiments of the present invention relating to a method for manufacturing a tubular member with an auxiliary member for joining dissimilar materials relate to the following (15) to (18).
(15) In the tube expansion process, an elastic body is inserted inside the inner member in which the outer member is arranged, and the elastic body is compressed in the axial direction to form a part of the peripheral wall of the inner member in diameter. The method for manufacturing a tubular member with an auxiliary member for joining dissimilar materials according to (14), which bulges outward in the direction.
(16) The outer member is provided with a plurality of holes along the circumferential direction.
In the tube expansion process, a plurality of balls are arranged inside the inner member corresponding to the plurality of holes, and the contact portion has a contact portion that abuts on the plurality of balls, and the corresponding contact portion is centered along the axial direction. By displacing the extruded member gradually separated from the shaft in the axial direction, the plurality of balls are moved radially outward of the inner member, and a part of the peripheral wall of the inner member facing the plurality of holes is radially displaced. The method for manufacturing a tubular member with an auxiliary member for joining dissimilar materials according to (14), which bulges outward.
(17) The inner member is the tubular member, and the outer member is the auxiliary member.
The auxiliary member has a hole or an inward groove formed therein, and has a hole or an inward groove.
The assist for joining different materials according to any one of (14) to (16), wherein the caulking connection is performed by fitting a part of the peripheral wall of the tubular member into the hole or the inward groove. A method for manufacturing a tubular member with a member.
(18) The metal material of the tubular member is either an aluminum alloy or a magnesium alloy, or a steel material.
The tubular with auxiliary member for joining dissimilar materials according to any one of (14) to (17), wherein the metal material of the auxiliary member is one of the aluminum alloy or magnesium alloy and the steel. Manufacturing method of parts.

According to the dissimilar material joining method and the dissimilar material joining joint of the present invention, the tubular auxiliary member is firmly bonded to the tubular first member, and the auxiliary member and the second member are joined by welding. A first member and a second member made of different metal materials can be indirectly joined via an auxiliary member.
Further, the second member can be joined to an arbitrary position of the first member according to the attachment position of the auxiliary member to the first member.
Further, if the tubular first member and the auxiliary member are connected in advance, the auxiliary member and the second member can be easily joined by a general welding method.
Therefore, the present invention can easily and reliably join members made of different metal materials at low cost, and can be applied to a wide range of fields.

Further, according to the tubular member with an auxiliary member for joining different materials of the present invention and the manufacturing method thereof, since the tubular auxiliary member is firmly bonded to the tubular member, the tubular member is made of a metal material different from the tubular member. The member can be indirectly joined via the auxiliary member.
Further, a member made of a metal material different from the tubular member can be joined to an arbitrary position of the tubular member according to the attachment position of the auxiliary member to the tubular member.
Therefore, the present invention can easily and reliably join members made of different metal materials at low cost, and can be applied to a wide range of fields.

It is a perspective view which shows the dissimilar material joint joint which concerns on 1st Embodiment of this invention. It is a perspective view which shows each step of the dissimilar material joining method which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the process of manufacturing the tubular member with auxiliary member for joining dissimilar material which concerns on this embodiment. It is a perspective view of the tubular member with the auxiliary member for joining dissimilar materials which concerns on an example of this embodiment. It is sectional drawing of the dissimilar material joining joint manufactured by the dissimilar material joining method which concerns on this embodiment. It is a perspective view which shows each process of the dissimilar material joining method which concerns on the 1st modification of this embodiment, and a dissimilar material joining joint. It is a cross-sectional view which shows the other example of a pipe and an auxiliary member in the 1st modification of this embodiment. It is a cross-sectional view which shows the other example of a pipe and an auxiliary member in the 1st modification of this embodiment. It is a cross-sectional view which shows the other example of a pipe and an auxiliary member in the 1st modification of this embodiment. It is a perspective view which shows the state which joins the tubular member with an auxiliary member, and a plate material in the 2nd modification of this embodiment. It is sectional drawing which shows the tubular member with the auxiliary member for joining dissimilar materials which concerns on the 3rd modification of this Embodiment. It is sectional drawing which shows the tubular member with auxiliary member for joining dissimilar material which concerns on 4th modification of this Embodiment. It is sectional drawing which shows the dissimilar material joining method which concerns on the 4th modification of this embodiment, and dissimilar material joining joint. It is sectional drawing which shows the dissimilar material joining method and the dissimilar material joining joint which concerns on 5th modification of this embodiment. It is a top view and the side view which shows the state before the bulging part is formed in the tube expansion processing of the dissimilar material joining method of the 2nd Embodiment of this invention, and the manufacturing method of the tubular member with an auxiliary member for dissimilar material joining. It is a top view and the side view which shows the metal ball and a circular tube for tube expansion processing used in 2nd Embodiment. It is a top view and the side view which shows the state after the bulging part is formed in the tube expansion processing of the dissimilar material joining method of 2nd Embodiment, and the manufacturing method of the tubular member with an auxiliary member for dissimilar material joining. It is a schematic diagram which shows the extrusion member and the metal ball which concerns on the modification of 2nd Embodiment, together with the movement at the time of tube expansion processing. It is a perspective view which shows the dissimilar material joint joint which concerns on 3rd Embodiment of this invention. It is a perspective view which shows each step of the dissimilar material joining method which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the tube expansion process in the dissimilar material joining method which concerns on 3rd Embodiment, and the manufacturing method of the tubular member with the auxiliary member for dissimilar material joining. It is a perspective view which shows the metal ball and the seat used in the tube expansion process in the dissimilar material joining method which concerns on 3rd Embodiment, and the manufacturing method of the tubular member with the auxiliary member for dissimilar material joining. It is sectional drawing which shows the pipe expansion process in the dissimilar material joining method and the manufacturing method of the tubular member with auxiliary member for dissimilar material joining which concerns on 3rd Embodiment. It is sectional drawing in the XXVa-XXVa line and XXVb-XXVb line of FIG. 19 before and after the tube expansion. It is sectional drawing which shows the pipe expansion process in the dissimilar material joining method which concerns on the modification of 3rd Embodiment, and the manufacturing method of the tubular member with the auxiliary member for dissimilar material joining. It is sectional drawing in the XXVIIa-XXVIIa line and the XXVIIb-XXVIIb line of FIG. 21 before and after the tube expansion. It is a perspective view which shows the metal ball and the seat used in the tube expansion process in the dissimilar material joining method which concerns on the modification of 3rd Embodiment, and the manufacturing method of the tubular member with the auxiliary member for dissimilar material joining.

Hereinafter, the dissimilar material joining method, the dissimilar material joining joint, the tubular member with the auxiliary member for dissimilar material joining, and the manufacturing method thereof according to each embodiment of the present invention will be described in detail with reference to the drawings.

(First Embodiment)
The dissimilar material joining method of the first embodiment is from a circular tubular pipe (first member, tubular member) 1 made of an aluminum alloy or a magnesium alloy (first metal material) and steel (second metal material). The flat plate-shaped plate material (second member) 2 is indirectly joined to each other by using a circular tubular auxiliary member 3 made of steel (third metal material), and a dissimilar material joining joint as shown in FIG. You get 10. Therefore, in the dissimilar material joint joint 10, the auxiliary member 3 is firmly bonded to the pipe 1 and the auxiliary member 3 and the plate material 2 are joined by arc welding or the like, as described in detail below.

The auxiliary member 3 is fitted and attached to the end of the pipe 1. Therefore, the inner diameter of the auxiliary member 3 is designed to be slightly larger than the outer diameter of the pipe 1. Further, the auxiliary member 3 is formed with a plurality of through holes (three in this embodiment) 3a at predetermined intervals in the circumferential direction.

The pipe 1 has a plurality of bulging portions 1a in which a part of the peripheral wall facing the plurality of through holes 3a of the auxiliary member 3 bulges outward in the radial direction and is fitted into the plurality of through holes 3a. , Is caulked to the auxiliary member 3. Therefore, the base portion of the bulging portion 1a is in contact with the inner peripheral surface of the auxiliary member 3 over the entire circumference of the edge portion of the through hole 3a, and the auxiliary member 3 is positioned axially with respect to the pipe 1. At the same time, it is stopped.

Then, a weld metal W is formed by arc welding at the corners of the plate material 2 and the end portion of the auxiliary member 3 placed on the flat surface of the plate material 2, and the plate material 2 and the auxiliary member 3 are firmly joined to each other. ing.

As shown in FIG. 2, for such a dissimilar material joint 10, first, a cylindrical pipe 1 and an auxiliary member 3 in which a plurality of through holes 3a are formed are prepared. The plurality of through holes 3a of the auxiliary member 3 are formed in the tubular blank member by using a punch or the like (not shown). The plurality of through holes 3a are not limited to the circular shape as shown in FIGS. 1 and 2, and may have other shapes such as a polygon.

Then, the auxiliary member 3 is arranged around the pipe 1, and as shown in FIG. 3, the peripheral wall of the pipe 1 facing the plurality of through holes 3a is formed by expanding the pipe 1 using the rubber 21 (elastic body). A part of the pipe 1 is bulged outward in the radial direction, and the pipe 1 and the auxiliary member 3 are caulked and joined.

In this caulking connection, as shown in FIG. 3, a pipe 1 and an auxiliary member 3 arranged around the pipe 1 are placed on the receiving seat 20. The receiving seat 20 has a columnar protruding portion 20a protruding from the upper surface on which the pipe 1 and the auxiliary member 3 are placed, and the pipe 1 is fitted around the protruding portion 20a. Further, inside the pipe 1 arranged on the receiving seat 20, a rubber 21 and a pressing member 22 having an outer diameter slightly smaller than the inner diameter of the pipe 1 are arranged. The rubber 21 is placed on the protruding portion 20a of the receiving seat 20 and extends above and below the through hole 3a in the vertical direction of the pipe 1. Therefore, the protruding portion 20a of the receiving seat 20 is shorter than the axial length from the end surface of the auxiliary member 3 to the through hole 3a. Further, the rubber 21 is set to a length extending above and below the through hole 3a even after being compressed in the axial direction. The pressing member 22 is placed on the rubber 21 and is connected to a press device (not shown) or the like, so that a strong load can be applied downward.

As the material of the rubber 21, for example, urethane rubber, chloroprene rubber, CNR rubber (chloroprene rubber + nitrile rubber), or silicon rubber is preferably used. Further, the hardness of these rubbers 21 is preferably 30 or more on the shore A.

Next, when a strong load is applied in the axial direction of the rubber 21 by the pressing member 22, the rubber 21 is elastically deformed so that the outer diameter is increased instead of shortening the total length. As a result, the inner peripheral surface of the pipe 1 is pressed outward in the radial direction, but the expansion of the diameter of the pipe 1 is restricted at the portion of the peripheral wall where the inner peripheral surface of the auxiliary member 3 faces, while the auxiliary member 3 The portion of the peripheral wall facing the through hole 3a is expanded by the elastically deformed rubber 21 and extruded outward in the radial direction, and bulges into the through hole 3a to form a dome-shaped bulging portion 1a, and the inside of the through hole 3a. Fit into.

Then, the rubber 21 recovers from the deformation by removing the load from the pressing member 22, but the bulging portion 1a of the plastically deformed pipe 1 maintains a state of remaining in the plurality of through holes 3a, so that the pipe 1 And the auxiliary member 3 are caulked and joined. After that, the pressing member 22 and the rubber 21 are removed from the inside of the pipe 1, and the pipe 1 and the auxiliary member 3 are further removed from the receiving seat 20 to obtain the joint body (tubular member with auxiliary member for joining different materials) 4 shown in FIG. be able to.
The joint body 4 as shown in FIG. 4 may be formed by caulking and connecting the pair of auxiliary members 3 to both ends of the pipe 1.

After that, returning to FIG. 2, the auxiliary member 3 of the joined body 4 and the plate material 2 are joined by arc welding or the like. Since the fillet welding by this arc is welding between steels, it is firmly joined without forming an intermetallic compound. In FIG. 2, reference numeral 23 represents a welding torch.

As shown in FIG. 5, the wall thickness t of the auxiliary member 3 is set so that the weld metal W does not reach the pipe 1 made of an aluminum alloy or a magnesium alloy during arc welding. In addition, the wall thickness t of the auxiliary member 3 is set so that the auxiliary member 3 is not deformed when the pipe 1 described above is expanded.

Further, in the present embodiment, the pipe 1 is made of an aluminum alloy or a magnesium alloy, and the plate material 2 and the auxiliary member 3 are made of steel, but the metal material of the plate material 2 and the auxiliary member 3 is different from the metal material of the pipe 1. The metal material of each member is not limited to this. For example, the metal material of the plate material 2 and the auxiliary member 3 may be any material that can be joined to each other by fusion welding without forming an intermetallic compound. Further, the steel compositions of the plate material 2 and the auxiliary member 3 may be the same or different from each other.
When the pipe 1 is made of steel and the plate material 2 is an aluminum alloy or a magnesium alloy, the auxiliary member 3 may be a metal material different from the metal material of the pipe 1, for example, the same metal material as the plate material 2. It may be an aluminum alloy or a magnesium alloy.

Further, instead of forming a plurality of through holes 3a in the auxiliary member 3, a plurality of bottomed holes recessed in the inner peripheral surface, and intermittently over the entire circumference or along the circumferential direction. It may be an inward groove formed in. That is, it suffices if the auxiliary member 3 does not come out of the pipe 1 due to the bulging portion 1a that bulges into the hole or the inward groove by the pipe expanding process of the pipe 1, and it is more preferable that the auxiliary member 3 is prevented from rotating.

Further, the cross-sectional shape of the pipe 1 is not limited to a circular shape, but may be arbitrary as long as it is a cylindrical shape, and as another example, it may be a polygon such as a quadrangle, a hexagon, or an octagon. In this case, the cross-sectional shape of the auxiliary member 3 may be any shape corresponding to the shape of the pipe 1, and may be not limited to a circle but may be a polygon such as a quadrangle, a hexagon, or an octagon. The rubber 21 and the pressing member 22 used for the pipe expansion process of the pipe 1 may also be prepared to correspond to the internal shape of the pipe 1.

For example, as shown in FIG. 6A, the pipe 1 may be a square tube member having a quadrangular cross-sectional shape. In this case, the auxiliary member 3 may also be a rectangle along the outer surface of the pipe 1, and the through holes 3a may be formed on each side surface.

Further, if the cross-sectional shape of the auxiliary member 3 is such that the bulging portion 1a is formed in the through hole 3a in contact with or close to the outer surface of the pipe 1 at the portion where the through hole 3a is formed, the pipe 1 It may have a shape corresponding to the shape of the pipe 1 or a shape different from the shape of the pipe 1.

For example, in FIG. 6B, the pipe 1 is a square tube member having a regular octagonal cross section, and the auxiliary member 3 is also a square tube member having a regular octagonal cross section. Further, the auxiliary member 3 is provided with through holes 3a on every other four sides.

In FIG. 6C, the pipe 1 is a circular tube member having a circular cross-sectional shape, and the auxiliary member 3 is a square tube member having a square cross-sectional shape. Further, the auxiliary member 3 is provided with through holes 3a on each side.

In FIG. 6D, the pipe 1 is a circular tube member having a circular cross-sectional shape, and the auxiliary member 3 is a square tube member having a regular hexagonal cross-sectional shape. Further, the auxiliary member 3 is provided with through holes 3a on every other three sides.

In any of the above-mentioned modified examples of FIGS. 6A to 6D, the auxiliary member 3 is firmly connected to the pipe 1 by the pipe expansion process of the pipe 1, and the auxiliary member 3 and the plate material 2 are joined by arc welding or the like. Will be done.

Further, as shown in FIG. 7, the end surface of the joint body 4 (the end surface of the pipe 1 and the auxiliary member 3) may be inclined with respect to the axial direction of the pipe 1, and the axial direction of the joint body 4 is the plate material 2. It is also possible to join at an angle with respect to the normal of. In this case, the end faces of the pipe 1 and the auxiliary member 3 may be cut diagonally after the pipe expansion processing, or may be cut diagonally before the pipe expansion processing.

Further, the bulging portion 1a of the pipe 1 may be one that is securely caulked and coupled to the through hole 3a of the auxiliary member 3, and the protruding height h of the bulging portion 1a is larger than the wall thickness t of the auxiliary member 3. It may be high, or as shown in FIG. 8, the wall thickness of the auxiliary member 3 may be t or less. The size of the bulging portion 1a is controlled by the size of the through hole 3a, the axial load of the pressing member 22 at the time of tube expansion processing, and the like.

Further, in the case of such a protruding height h, as shown in FIG. 9A, the bulging portion 1a and the through hole 3a are located on both ends in the axial direction of the auxiliary member 3, and the auxiliary member 3 is connected to the pipe 1. By forming the joint body 4 arranged in the intermediate portion in the axial direction, the plate material 2 having the opening can be inserted around the auxiliary member 3. As a result, as shown in FIG. 9B, the plate material 2 is joined to the axial intermediate portion of the pipe 1 by joining each corner portion between the pair of auxiliary members 3 and the plate material 2 by arc welding or the like. Can be done.

Further, the pipe 1 and the auxiliary member 3 may be connected so that their end faces are flush with each other as shown in FIG. 5, but as shown in FIG. 10, the end face of the auxiliary member 3 is the pipe 1. It may be joined so as to extend beyond the end face of the.
As a result, in the embodiment shown in FIG. 5, it was necessary to be careful not to hit the weld metal with the pipe 1 during fillet welding, but in the modified example shown in FIG. 10, the weld metal is attached to the pipe 1. You don't have to be careful not to hit it.

As described above, according to the dissimilar material joining method of the present embodiment, when the tubular pipe 1 is made of an aluminum alloy or a magnesium alloy and the flat plate-shaped plate 2 is made of steel, it is made of steel and penetrates. By arranging the tubular auxiliary member 3 in which the hole 3a is formed around the pipe 1 and by expanding the pipe 1, a part of the peripheral wall thereof bulges outward in the radial direction with respect to the through hole 3a. The step of caulking and joining the pipe 1 and the auxiliary member 3 and the step of joining the pipe 1 and the plate material 2 via the auxiliary member 3 by welding the auxiliary member 3 and the plate material 2 are performed. Be prepared.
Further, according to the dissimilar material joint 10 of the present embodiment, the tubular pipe 1 made of an aluminum alloy or a magnesium alloy, the flat plate-shaped plate 2 made of steel and joined to the pipe 1, and the steel are used. A tubular auxiliary member 3 in which a through hole 3a is formed is provided, and the pipe 1 has a bulging portion 1a in which a part of the peripheral wall thereof bulges outward in the radial direction and is fitted into the through hole 3a. Then, the auxiliary member 3 is caulked and coupled, and the auxiliary member 3 and the plate material 2 are welded together.
As a result, the tubular auxiliary member 3 is firmly bonded to the tubular pipe 1, and the auxiliary member 3 and the plate material 2 are joined by welding, so that the pipe 1 and the plate material 2 made of different metal materials can be combined. It can be indirectly joined via the auxiliary member 3.
Further, the plate material 2 can be joined to an arbitrary position of the pipe 1 according to the attachment position of the auxiliary member 3 to the pipe 1.
Further, if the tubular pipe 1 and the auxiliary member 3 are connected in advance, the auxiliary member 3 and the plate material 2 can be easily joined by a general welding method.
Therefore, this embodiment can easily and reliably join the pipe 1 and the plate material 2 made of different metal materials at low cost, and can be applied to a wide range of fields.

Further, according to the method for manufacturing a tubular member with an auxiliary member for joining different materials according to the present embodiment, a tubular pipe 1 made of an aluminum alloy or a magnesium alloy and a tubular auxiliary member made of steel and arranged around the pipe 1 are provided. By arranging the tubular auxiliary member 3 having the member 3 and having the through hole 3a formed around the pipe 1 and expanding the pipe 1, a part of the peripheral wall thereof is radially outward. A step of bulging and fitting into the through hole 3a, and caulking and joining the pipe 1 and the auxiliary member 3 is provided.
Further, according to the tubular member with an auxiliary member for joining different materials of the present embodiment, the tubular member made of an aluminum alloy or a magnesium alloy and the tubular auxiliary member 3 made of steel and arranged around the pipe 1 are provided. A through hole 3a is formed in the auxiliary member 3, and the pipe 1 has a bulging portion 1a in which a part of the peripheral wall thereof bulges outward in the radial direction and is fitted into the through hole 3a.
As a result, the tubular auxiliary member 3 is firmly connected to the pipe 1, so that the pipe 1 and the plate material 2 made of a metal material different from the pipe 1 are indirectly joined via the auxiliary member 3. Can be done.
Further, a plate material 2 made of a metal material different from that of the pipe 1 can be joined to an arbitrary position of the pipe 1 according to the attachment position of the auxiliary member 3 to the pipe 1.
Therefore, this embodiment can easily and reliably join the pipe 1 and the plate material 2 made of different metal materials at low cost, and can be applied to a wide range of fields.

(Second Embodiment)
Next, a method for joining different materials and a method for manufacturing a tubular member with an auxiliary member for joining different materials according to the second embodiment will be described. In the present embodiment, the pipe expansion processing of the pipe 1 is different from that of the first embodiment. That is, in the first embodiment, the pipe expansion processing of the pipe 1 was performed by compressing the elastic body in the axial direction, but in the present embodiment, as shown in FIGS. 11 to 13, a plurality of pipes (this embodiment) are performed. In the form, it is performed using three) metal balls (balls) 31.
Therefore, the dissimilar material joining joint 10 and the joint body (tubular member with an auxiliary member for dissimilar material joining) 4 to be manufactured are substantially the same as those of the first embodiment.

As shown in FIGS. 11 and 12, the plurality of metal balls 31 are held by using an elastically deformable circular tube 42 made of resin or rubber. Specifically, a plurality of (three in this embodiment) holes 42a are provided at equal intervals on the peripheral wall of the circular tube 42, and the three metal balls 31 are partially each from the three holes 42a. It is held in the circular tube 42 in a protruding state.

Further, as shown in FIG. 11, the three metal balls 31 and the circular tube 42 are supported by a circular tubular lower holding tube 43 housed in the pipe 1. Therefore, the three metal balls 31 are arranged at the same height as the plurality of through holes 3a of the auxiliary member 3 arranged around the pipe 1.

Further, a circular tubular upper holding pipe 44 is inserted from above the pipe 1, and the lower surface thereof is brought into contact with the circular pipe 42. Further, in this state, the three metal balls 31 are arranged in phase with each other so as to face the through hole 3a of the auxiliary member 3.
The auxiliary member 3 needs to be positioned in the axial direction with respect to the pipe 1, and the auxiliary member 3 needs to be held at a predetermined height by using a jig or the like (not shown).

From this state, as shown in FIG. 13, the extruded member 40 whose lower portion is a conical portion 40a is inserted from above the pipe 1 according to the guidance of the circular tubular upper holding pipe 44, and the conical portion 40a is inserted into three metal balls. Contact with 31. Then, when the extrusion member 40 is lowered along the axial direction with a strong pressing force, the conical portion 40a presses the three metal balls 31 while entering the lower holding pipe 43. Since the metal ball 31 is restricted from moving in the axial direction by the upper surface of the lower holding tube 43, the metal ball 31 moves so as to be separated from each other in the radial direction while deforming the circular tube 42. Due to the movement of the metal ball 31, a part of the peripheral wall of the pipe 1 is fitted into the through hole 3a of the auxiliary member 3 to form a bulging portion 1a, and the pipe 1 and the auxiliary member 3 are caulked and connected. Become. After that, when the extruded member 40 is retracted upward, the metal ball 31 comes out of the bulging portion 1a, and the joint body 4 composed of the pipe 1 and the auxiliary member 3 can be taken out from the lower holding pipe 43.
Other configurations and operations are the same as those of the first embodiment.

The extruded member 40 is not limited to the conical portion 40a as in the present embodiment, but has a contact portion that abuts on a plurality of metal balls 31, and the corresponding contact portion is a central axis along the axial direction. It suffices as long as it gradually separates from. As a result, the extrusion member 40 is displaced in the axial direction, so that the plurality of metal balls 31 can be moved outward in the radial direction of the pipe 1.

Therefore, the contact portion of the extruded member 40 may be formed by a conical portion 40a having three points in the circumferential direction in contact with the plurality of metal spheres 31, as in the above embodiment, or the deformation shown in FIG. As an example, a plurality of (three places) concave surface portions 40b corresponding to the radius r of the metal sphere 31 may be configured to be gradually separated from the central axis along the axial direction. Further, in this case, the concave surface portion 40b gradually increases the arc length as it gradually separates from the central axis along the axial direction. Further, the extruded member 40 is configured to connect the three concave surface portions 40b with tapered surfaces.
In the case of this modification, since the extruded member 40 is displaced in the axial direction, the metal ball 31 can be prevented from being displaced in the circumferential direction due to the concave surface portion 40b, so that the metal ball 31 is surely outward toward the hole 42a of the circular tube 42. The metal ball 31 can be extruded.

(Third Embodiment)
Next, the dissimilar material joining method according to the third embodiment of the present invention will be described with reference to FIGS. 15 to 23. The description of the same or equivalent parts as those of the first embodiment and the second embodiment will be omitted or simplified.

In the third embodiment, the auxiliary member 3 is internally fitted and attached to the end portion of the pipe 1. Therefore, the outer diameter of the auxiliary member 3 is designed to be slightly smaller than the inner diameter of the pipe 1. Further, as shown in FIG. 16, a plurality of through holes (three in this embodiment) 1d are formed in the pipe 1 at predetermined intervals in the circumferential direction. On the other hand, the auxiliary member 3 has a plurality of bulging portions 3d in which a part of the peripheral wall facing the plurality of through holes 1d of the pipe 1 bulges inward in the radial direction and is fitted into the plurality of through holes 1d. As a result, the pipe 1 and the auxiliary member 3 are caulked and connected. The base of the bulging portion 3d is in contact with the outer peripheral surface of the auxiliary member 3 over the entire circumference of the edge portion of the through hole 1d, and the auxiliary member 3 is positioned axially with respect to the pipe 1 and is also positioned. It is detented. Further, in a state where the pipe 1 and the auxiliary member 3 are caulked and coupled to each other, the axial end portion 3f of the auxiliary member 3 extends from the axial end portion 1f of the pipe 1.

Further, a weld metal W is formed by arc welding at a corner between the plate material 2 and the axial end portion 3f of the auxiliary member 3 placed on the flat surface of the plate material 2, and the plate material 2 and the auxiliary member 3 are strengthened. It is joined to. Since the axial end portion 3f of the auxiliary member 3 extends from the axial end portion 1f of the pipe 1, it can be easily welded to the plate material 2.

As shown in FIGS. 15 to 20, for such a dissimilar material joint 10, first, a circular tubular pipe 1 having a plurality of through holes 1d formed therein and a cylindrical auxiliary member 3 are prepared. The plurality of through holes 1d of the pipe 1 are formed in a tubular blank member by using a punch or the like (not shown). The plurality of through holes 1d are not limited to a circle as shown in FIG. 16, but may have other shapes such as a polygon.

Then, the auxiliary member 3 is arranged inside the pipe 1, and as shown in FIG. 17, by tube expansion processing using a plurality of (three in this embodiment) metal balls (balls) 31 and an extrusion member 40. , A part of the peripheral wall of the auxiliary member 3 facing the plurality of through holes 1d is bulged outward in the radial direction, and the pipe 1 and the auxiliary member 3 are caulked and connected.

Here, as described above, the auxiliary member 3 is arranged inside the pipe 1, and the axial end portion 3f of the auxiliary member 3 extends from the axial end portion 1f of the pipe 1. Therefore, in the receiving seat 35 used for the pipe expansion process, the support surface 34 that supports the auxiliary member 3 is formed in the annular groove 38 provided inside the support surface 33 that supports the pipe 1. That is, the annular groove 38 formed in the support shaft portion 36 is formed between the tubular shaft portion that is internally fitted to the inner peripheral surface of the auxiliary member 3 and the ring portion that forms the support surface 33 of the pipe 1. To.

The three metal balls 31 are arranged on the upper surface 32a of the support shaft portion 36. The upper surface 32a has a height such that the three metal balls 31 have the same height as the plurality of through holes 1d of the pipe 1 arranged around the auxiliary member 3. It is preferable that the thickness of the upper surface 32a of the support shaft portion 36 in the radial direction is larger than the radius of the metal sphere 31 in order to hold the metal sphere 31. Further, the inner diameter of the support shaft portion 36 is designed so as not to interfere with the extrusion member 40 when the extrusion member 40 described later is inserted. In order to prevent the metal ball 31 from falling, the metal ball 31 is placed on the upper surface 32a after the auxiliary member 3 is arranged in the annular groove 38.

The extruded member 40 has a substantially triangular pyramid-shaped contact portion 40c having three groove-shaped concave surfaces 40d, as in the first embodiment. Further, when the above-mentioned receiving seat 35 is used, the position of the metal ball 31 in the circumferential direction can be changed by rotating the extrusion member 40 in the circumferential direction. Therefore, by changing the position of the metal sphere 31 in the circumferential direction, the three metal spheres 31 can be phase-aligned so as to face the through hole 1d of the pipe 1.

Therefore, in the pipe expansion process, first, the pipe 1 and the auxiliary member 3 are arranged on the support surfaces 33 and 34 of the receiving seat 35, respectively. At this time, the pipe 1 and the metal ball 31 are phase-aligned so that the three metal balls 31 on the upper surface 32a of the receiving seat 35 face the through hole 3a of the auxiliary member 3.

Then, the extruded member 40 is inserted from above the pipe 1 and the three concave surfaces 40d are brought into contact with the three metal balls 31. Then, when the extrusion member 40 is lowered along the axial direction with a strong pressing force, the contact portion 40c presses the three metal balls 31 while entering the support shaft portion 36 of the receiving seat 35. The metal sphere 31 moves on the upper surface 32a of the support shaft portion 36 so as to be separated from each other radially outward by the three concave surfaces 40d. Due to the movement of the metal ball 31, a part of the peripheral wall of the auxiliary member 3 is fitted into the through hole 1d of the pipe 1 to form a bulging portion 3d, and the pipe 1 and the auxiliary member 3 are caulked and connected. Become. After that, the extruded member 40 is retracted upward and pulled out from the pipe 1, and further, the joint body (tubular member with auxiliary member for joining different materials) 4 composed of the pipe 1 and the auxiliary member 3 is pulled out from the receiving seat 35. At that time, the metal ball 31 is pulled out from the bulging portion 3d of the auxiliary member 3.

Further, since the pipe 1 supported by the receiving seat 35 and the auxiliary member 3 are supported by the support surfaces 33 and 34 having different heights, the axial end portion 3f of the auxiliary member 3 is the axial end of the pipe 1. The pipe 1 and the auxiliary member 3 are caulked and coupled so as to extend from the portion 1f.

After that, returning to FIG. 16, the auxiliary member 3 of the joined body 4 and the plate material 2 are joined by arc welding or the like. Since the fillet welding by this arc is welding between steels, it is firmly joined without forming an intermetallic compound.

In the present embodiment, the pipe 1 is made of an aluminum alloy or a magnesium alloy, and the plate material 2 and the auxiliary member 3 are made of steel, but the metal material of the plate material 2 and the auxiliary member 3 is different from the metal material of the pipe 1. The metal material of each member is not limited to this. For example, the metal material of the plate material 2 and the auxiliary member 3 may be any material that can be joined to each other by fusion welding without forming an intermetallic compound. Further, the steel compositions of the plate material 2 and the auxiliary member 3 may be the same or different from each other.
When the pipe 1 is made of steel and the plate material 2 is an aluminum alloy or a magnesium alloy, the auxiliary member 3 may be a metal material different from the metal material of the pipe 1, for example, the same metal material as the plate material 2. It may be an aluminum alloy or a magnesium alloy.

Further, as shown in FIGS. 21 to 23, the tube expansion process may be performed using a receiving seat 35 having a support shaft portion 36 having a hole 32 for holding the metal ball 31.

As described above, according to the dissimilar material joining method of the present embodiment, when the tubular pipe 1 is made of an aluminum alloy or a magnesium alloy and the flat plate material 2 is made of steel, the tubular pipe made of steel is made of steel. The step of arranging the pipe 1 having a plurality of through holes 1d formed around the auxiliary member 3 and a part of the peripheral wall of the auxiliary member 3 facing the plurality of through holes 1d formed in the pipe 1 are radially outward. By bulging and fitting into the through hole 1d of the pipe 1 and caulking and joining the pipe 1 and the auxiliary member 3, and by welding the auxiliary member 3 and the plate material 2, the pipe 1 is passed through the auxiliary member 3. It has a step of joining the plate material 2 and the plate material 2.

Further, according to the dissimilar material joining joint 10 of the present embodiment, a tubular pipe 1 made of an aluminum alloy or a magnesium alloy, a flat plate-shaped plate 2 made of steel and joined to the pipe 1, and steel are used. A tubular auxiliary member 3 in which a plurality of through holes 3a are formed in the circumferential direction is provided, and the auxiliary member 3 has a part of its peripheral wall bulging outward in the radial direction with respect to the through hole 1d of the pipe 1. By having a plurality of bulging portions 3d to be fitted, the auxiliary member 3 is caulked and coupled, and the auxiliary member 3 and the plate material 2 are welded to each other.
As a result, the tubular auxiliary member 3 is firmly bonded to the tubular pipe 1, and the auxiliary member 3 and the plate material 2 are joined by welding, so that the pipe 1 and the plate material 2 made of different metal materials can be combined. It can be indirectly joined via the auxiliary member 3.

Further, if the tubular pipe 1 and the auxiliary member 3 are connected in advance, the auxiliary member 3 and the plate material 2 can be easily joined by a general welding method.
Therefore, this embodiment can easily and reliably join the pipe 1 and the plate material 2 made of different metal materials at low cost, and can be applied to a wide range of fields.

Further, according to the method for manufacturing a tubular member with an auxiliary member for joining different materials according to the present embodiment, a tubular auxiliary member 1 made of an aluminum alloy or a magnesium alloy and a tubular auxiliary member 3 made of steel that fits with the pipe 1. A step of arranging a pipe 1 having a plurality of through holes 1d formed around the tubular auxiliary member 3 and a peripheral wall of the auxiliary member 3 facing the plurality of through holes 1d formed in the pipe 1. A step is provided in which a part of the pipe 1 is bulged outward in the radial direction and fitted into the through hole 1d, and the pipe 1 and the auxiliary member 3 are caulked and joined.
Further, according to the tubular member with an auxiliary member for joining different materials of the present embodiment, the tubular member made of an aluminum alloy or a magnesium alloy and the tubular auxiliary member 3 made of steel and arranged inside the pipe 1 are provided. A plurality of through holes 1d are formed in the pipe 1, and the pipe 1 has a plurality of bulging portions in which a part of the peripheral wall thereof bulges outward in the radial direction and is fitted into the plurality of through holes 1d. By having 3d, it is caulked and coupled with the auxiliary member 3.
As a result, the tubular auxiliary member 3 is firmly connected to the pipe 1, so that the pipe 1 and the plate material 2 made of a metal material different from the pipe 1 are indirectly joined via the auxiliary member 3. Can be done.
Therefore, this embodiment can easily and reliably join the pipe 1 and the plate material 2 made of different metal materials at low cost, and can be applied to a wide range of fields.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.
For example, the pipe expanding step of the pipe 1 of the present invention is not limited to the above-mentioned two embodiments, and for example, electromagnetic molding may be used or hydroforming may be used.

1 pipe (first member, tubular member)
1a bulging part 1d through hole 2 plate material (second member)
3 Auxiliary member 3a Through hole (hole)
3d bulging part 3f axial end part 4 joint body 10 dissimilar material joint joint 20 receiving seat 20a protruding part 21 rubber 22 pressing member 23 welding torch 31 metal ball (ball)
32 Hole 32a Top 33 Support surface 34 Support surface 38 Circular groove 40 Extruded member 40a Conical part (contact part)
40b concave part (contact part)
40c Contact part 40d Concave surface 42 Circular pipe 42a Hole 43 Lower restraint pipe 44 Upper restraint pipe

Claims (16)

In a dissimilar material joining method in which a tubular first member made of a first metal material and a second member made of a second metal material different from the first metal material are joined.
A tubular auxiliary member made of a third metal material different from the first metal material, and one of the auxiliary members and the first member around the inner member of any one of the first members. And the process of arranging the outer members of
A step of caulking and joining the first member and the auxiliary member by expanding a part of the peripheral wall of the inner member to the outside in the radial direction by expanding the tube.
A step of joining the first member and the second member via the auxiliary member by welding the auxiliary member and the second member.
Dissimilar material joining method having. In the tube expansion process, an elastic body is inserted inside the inner member in which the outer member is arranged, and the elastic body is compressed in the axial direction, so that a part of the peripheral wall of the inner member is radially outward. The dissimilar material joining method according to claim 1, wherein the material is inflated. The outer member is provided with a plurality of holes along the circumferential direction.
In the tube expansion process, a plurality of balls are arranged inside the inner member corresponding to the plurality of holes, and the contact portion has a contact portion that abuts on the plurality of balls, and the corresponding contact portion is centered along the axial direction. By displacing the extruded member gradually separated from the shaft in the axial direction, the plurality of balls are moved radially outward of the inner member, and a part of the peripheral wall of the inner member facing the plurality of holes is radially displaced. The dissimilar material joining method according to claim 1, wherein the material is bulged outward. The inner member is the first member, the outer member is the auxiliary member, and the like.
The auxiliary member has a hole or an inward groove formed therein, and has a hole or an inward groove.
The dissimilar material joining method according to any one of claims 1 to 3, wherein the caulking joint is performed by fitting a part of the peripheral wall of the first member into the hole or the inward groove. The first metal material is either an aluminum alloy or a magnesium alloy, or a steel material.
The dissimilar material joining method according to any one of claims 1 to 4, wherein the second and third metal materials are made of either an aluminum alloy or a magnesium alloy and the steel, whichever is the other. A dissimilar material joint having a tubular first member made of a first metal material and a second member made of a second metal material different from the first metal material and joined to the first member. In the joint
A tubular auxiliary member made of a third metal material different from the first metal material is provided.
The inner member, which is either one of the auxiliary member and the first member, has a bulging portion in which a part of the peripheral wall thereof bulges outward in the radial direction, so that the auxiliary member and the first member have a bulge. Caulked to one of the other outer members,
A dissimilar material joint in which the auxiliary member and the second member are welded. The inner member is the first member, the outer member is the auxiliary member, and the like.
The auxiliary member has a hole or an inward groove formed therein, and has a hole or an inward groove.
The dissimilar material joint according to claim 6, wherein a part of the peripheral wall of the first member is fitted into the hole or the inward groove. The auxiliary member is provided with a plurality of the holes along the circumferential direction.
The dissimilar material joint according to claim 7, wherein the first member has a plurality of the bulging portions fitted into the plurality of holes. The first metal material is either an aluminum alloy or a magnesium alloy, or a steel material.
The dissimilar material joint according to any one of claims 6 to 8, wherein the second and third metal materials are made of either the aluminum alloy or the magnesium alloy and the steel, whichever is the other. A tubular member with an auxiliary member for joining dissimilar materials, comprising a tubular member made of a metal material and a tubular auxiliary member made of a metal material different from the metal material of the tubular member and fitted with the tubular member .
The inner member , which is the tubular member, is caulked and coupled to the outer member , which is the auxiliary member, by having a bulging portion in which a part of the peripheral wall thereof bulges outward in the radial direction .
The auxiliary member has a hole or an inward groove formed therein, and has a hole or an inward groove.
A tubular member with an auxiliary member for joining different materials , in which a part of the peripheral wall of the tubular member is fitted into the hole or the inward groove . The auxiliary member is provided with a plurality of through holes constituting the hole along the circumferential direction.
The tubular member has a plurality of the bulges that are fitted into the plurality of through holes.
The tubular member with an auxiliary member for joining different materials according to claim 10 , wherein the protruding height of the plurality of bulging portions is equal to or less than the wall thickness of the auxiliary member. The metal material of the tubular member is either an aluminum alloy or a magnesium alloy, or a steel material.
The tubular member with an auxiliary member for joining dissimilar materials according to claim 10 or 11 , wherein the metal material of the auxiliary member is one of the aluminum alloy or magnesium alloy and the steel. A method for manufacturing a tubular member with an auxiliary member for joining dissimilar materials, comprising a tubular member made of a metal material and a tubular auxiliary member made of a metal material different from the metal material of the tubular member and fitted with the tubular member. ,
A step of arranging the outer member of either the auxiliary member or the tubular member around the inner member of either the auxiliary member or the tubular member.
A step of caulking and joining the tubular member and the auxiliary member by expanding a part of the peripheral wall of the inner member by expanding the tube and bulging outward in the radial direction is provided .
In the tube expansion process, an elastic body is inserted inside the inner member in which the outer member is arranged, and the elastic body is compressed in the axial direction, so that a part of the peripheral wall of the inner member is radially outward. A method for manufacturing a tubular member with an auxiliary member for joining dissimilar materials to be inflated. The outer member is provided with a plurality of holes along the circumferential direction.
In the tube expansion process, a plurality of balls are arranged inside the inner member corresponding to the plurality of holes, and the contact portion has a contact portion that abuts on the plurality of balls, and the corresponding contact portion is centered along the axial direction. By displacing the extruded member gradually separated from the shaft in the axial direction, the plurality of balls are moved radially outward of the inner member, and a part of the peripheral wall of the inner member facing the plurality of holes is radially displaced. The method for manufacturing a tubular member with an auxiliary member for joining dissimilar materials according to claim 13 , which bulges outward. The inner member is the tubular member, the outer member is the auxiliary member, and the outer member is the auxiliary member.
The auxiliary member has a hole or an inward groove formed therein, and has a hole or an inward groove.
The method for manufacturing a tubular member with an auxiliary member for joining dissimilar materials according to claim 13 , wherein the caulking connection is performed by fitting a part of the peripheral wall of the tubular member into the hole or the inward groove. .. The metal material of the tubular member is either an aluminum alloy or a magnesium alloy, or a steel material.
The tubular member with an auxiliary member for joining dissimilar materials according to any one of claims 13 to 15 , wherein the metal material of the auxiliary member is one of the aluminum alloy or the magnesium alloy and the steel, whichever is the other. Production method.

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