JP2011000620A - Method of joining pipe and member to be joined - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of joining a pipe and a member to be joined by which the joining strength between the pipe and the member to be joined is raised.SOLUTION: The pipe 60 is inserted into an inserting hole 71 which is provided on the member 70 to be joined. An expanding and joining tool 51 is arranged in the hollow part 62 of the pipe 60. The pipe 60 is expanded with the expanding and joining tool 51 so that the outer peripheral surface 61 of the pipe 60 is pressure-contacted with the inner peripheral surface 72 of the inserting hole 71 of the member 70 to be joined while relatively rotating the pipe 60 about the center axis Z of the pipe 60 to the member 70 to be joined. In this way, the member 70 to be joined is expanded and joined with the pipe 60 and simultaneously pressure-welded by friction.

Description

  The present invention relates to a method for joining a pipe and a member to be joined used in manufacturing automobile parts, piping materials, etc., a joining device used in the joining method, a method for joining a pipe and a plurality of members to be joined, The present invention relates to a joining apparatus used in the joining method and a joining structure of a pipe and a member to be joined.

  Conventionally, as a method of joining a member to be joined such as a flange to a pipe, for example, a pipe expansion joining method is known (see, for example, Patent Documents 1 to 7). This tube expansion joining method is as follows.

  The pipe is inserted into an insertion hole provided in the member to be joined, and a pipe expansion joining tool is disposed in the hollow portion of the pipe. The tube expansion joining tool includes a die having a wedge hole portion at the center and divided into a plurality of die segments in the circumferential direction around the wedge hole portion, and a wedge portion for moving each die segment of the die radially outward. And a mandrel having. Next, by inserting the wedge portion of the mandrel into the wedge hole portion of the die, each die segment of the die is moved outward in the radial direction of the pipe, and the outer peripheral surface of the pipe is pressed against the inner peripheral surface of the insertion hole of the member to be joined. In this manner, the pipe is pressed radially outward by each die segment. At this time, the pressure on the pipe by each die segment is performed until the pipe is plastically deformed. This expands the pipe. As a result, the member to be joined is expanded and joined to the pipe in a fixed state.

  Further, although different from the pipe expansion joining method, a radial friction welding method is known as a method for joining the ends of two pipes. In this method, the ends of two pipes fixed to be non-rotatable are butted against each other, and the ring is pressurized in the diameter-reducing direction while rotating an annular ring extrapolated to the butted portions of both pipes. Thus, the ring is slidably brought into contact with the outer peripheral surface of the butt portion of both pipes, whereby the ends of both pipes are friction-welded through the rings.

Japanese Patent Laid-Open No. 4-8818 (page 2, FIG. 8) JP 2007-296569 A JP 2007-283323 A JP 2009-50875 A JP 2009-72825 A JP 2009-90313 A JP 2009-107005 A

  Thus, in the joint structure obtained by the above-mentioned pipe expansion joining method, for example, when this joint structure is used for a structural member such as an automobile frame or a piping material, in general, the pipe and the covering are used. A high strength is required for the bonding strength with the bonding member. However, in the conventional joint structure, since the pipe and the member to be joined are joined only by the pressure contact force (contact surface pressure) between them, the joint strength between the pipe and the member to be joined may be insufficient.

  In the radial friction welding method, the joint strength between the ends of both pipes can be increased by bringing the ring into uniform sliding contact with the outer peripheral surface of the butt portion of the pipe. However, in order to make the ring slidably contact the outer peripheral surface of the butt portion of the pipe, the ring must be uniformly pressed in the diameter reducing direction, and it is difficult to control the diameter reduction of the ring. For this reason, it has been difficult to obtain high bonding strength.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to use a joining method between a pipe and a member to be joined, which can increase the joining strength between the pipe and the member to be joined, and the joining method. The present invention provides a joining device, a joining method of a pipe and a plurality of members to be joined, a joining device used in the joining method, and a joining structure of a pipe and a joined member.

  The present invention provides the following means.

  [1] While the pipe is inserted into the insertion hole provided in the member to be joined, the outer peripheral surface of the pipe is joined while rotating the pipe relative to the member to be joined about the central axis of the pipe. The pipe is expanded by a pipe expansion joining tool disposed in the hollow portion so as to be pressed against the inner peripheral surface of the insertion hole of the member, and the welded member is expanded and joined to the pipe at the same time as the friction welding. A method of joining a pipe and a member to be joined.

  [2] The outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be joined, and the portions near both sides in the axial direction of the insertion portion into the insertion hole of the pipe swell outward in the radial direction of the pipe. The method of joining a pipe and a member to be joined according to the preceding item 1, wherein the pipe is expanded so as to be removed.

[3] The member to be joined is fixed so as not to rotate about the central axis of the pipe,
The pipe is supported so that it can be driven and rotated around its central axis.
The pipe expansion joint tool that is driven to rotate around the center axis of the pipe is brought into contact with the inner peripheral surface of the pipe, so that the pipe is driven to rotate around the center axis of the pipe according to the rotation operation of the pipe expansion joint tool. 3. A method for joining the pipe according to the preceding item 1 or 2 and a member to be joined, for expanding the pipe.

[4] The pipe is fixed so that it cannot rotate around its central axis.
3. The method for joining a pipe and a member to be joined according to the preceding item 1 or 2, wherein the pipe is expanded while rotating the member to be joined about the central axis of the pipe.

  [5] The method for joining a pipe and a member to be joined according to the preceding item 1 or 2, wherein the pipe is expanded while rotating the pipe and the member to be joined in directions opposite to each other about the central axis of the pipe.

  [6] Under the state where the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be bonded, the rotation is controlled so that the circumferential position of the predetermined portion of the member to be bonded with respect to the pipe becomes a predetermined position. The joining method of the pipe and bonded member in any one of the preceding items 1 to 5 to be stopped.

[7] A cylindrical seat portion is integrally formed on the peripheral portion of the insertion hole of the member to be joined so as to protrude to one side in the axial direction of the pipe,
The pipe is inserted into the member to be joined in a state where the pipe is inserted into the insertion hole of the member to be joined and the amount of bulging to the outside of the seat part is regulated by the regulating member disposed outside the seat part of the member to be joined. 7. The method for joining a pipe and a member to be joined according to any one of the preceding items 1 to 6, wherein the pipe is expanded while relatively rotating about the central axis of the pipe.

[8] The member to be joined has one of the surfaces on both sides in the thickness direction as a connection surface connected to the other member,
A cylindrical seat portion is formed integrally with the peripheral edge portion of the insertion hole of the member to be joined, protruding to the side opposite to the connecting surface,
An engagement recess is formed in a region from the axially intermediate portion of the insertion hole to the connection surface on the inner peripheral surface of the insertion hole of the member to be joined,
The pipe is connected to the member to be joined in a state where the end of the pipe is inserted into the insertion hole of the member to be joined so that the end surface of the pipe is disposed in the range from the axial intermediate portion of the insertion hole to the connecting surface of the member to be joined. The outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be joined, while rotating about the central axis of the pipe relative to the pipe. 8. The joining method of a pipe and a member to be joined according to any one of the preceding items 1 to 7, wherein the pipe is expanded so that a portion near the pipe end face side is engaged with the engagement recess.

[9] The pipe expansion joining tool includes a die having a wedge hole portion and divided into a plurality of die segments around the wedge hole portion, and a wedge portion that is inserted into the wedge hole portion of the die. A mandrel that moves each die segment of the die outwardly of the radius of the pipe,
The die segment has a piece part having one pressing convex part among two pressing convex parts that press the vicinity of both sides in the axial direction of the insertion part into the pipe insertion hole, and a mandrel with the other pressing convex part. The pipe and member to be joined according to any one of the preceding items 1 to 8, further comprising: a die segment body that abuts on the outer peripheral surface of the wedge portion; and a connecting means that detachably connects the piece portion and the die segment body. Joining method.

[10] A plurality of dies having a wedge hole portion and divided into a plurality of die segments in the circumferential direction around the wedge hole portion are arranged apart from each other in the axial direction and adjacent to each other. A die connection body in which each die segment of one die and each die segment of the other die are connected to each other via a die connection rod in each die,
A mandrel having a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body, wherein the plurality of wedge portions are formed apart from each other in the axial direction;
Prepare a pipe expansion joining tool with
The pipe is inserted into the plurality of members to be joined in a state where the plurality of members to be joined are spaced apart from each other in the axial direction of the pipe through insertion holes provided in the members to be joined, respectively. With the pipe expansion joining tool arranged in the hollow portion so that the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of each member to be joined while rotating about the central axis of the pipe relative to the A method of joining a pipe and a plurality of members to be joined, wherein the plurality of members to be joined are pipe-expanded and joined together at the same time by friction expanding by pipe expansion.

[11] The pipe is expanded so that the pipe is disposed in the hollow portion of the pipe inserted into the insertion hole provided in the member to be joined, and the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be joined. A pipe expansion joining tool for expanding and joining a member to be joined to a pipe by processing;
When pipe expansion processing is performed with the pipe expansion joining tool, at least one of the pipe, the pipe expansion joining tool, and the member to be joined is arranged so that the pipe rotates about the central axis of the pipe relative to the member to be joined. A rotation drive unit for rotation;
An apparatus for joining a pipe and a member to be joined.

  [12] In the rotation drive unit, the circumferential position of a predetermined portion of the member to be bonded to the pipe is a predetermined position in a state where the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be bonded. The joining apparatus of the pipe and the to-be-joined member according to 11 above, comprising a control unit for controlling and stopping the rotation.

[13] The plurality of members to be joined are arranged in the hollow portions of the pipes inserted in the through holes provided in the plurality of members to be joined so as to be separated from each other in the axial direction of the pipe, and the pipes A pipe expansion tool for expanding and joining a plurality of members to be joined together to the pipe by expanding the pipe so that the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of each member to be joined;
When the pipe is expanded by the pipe expansion joining tool, the pipe, the pipe expansion joining tool, and the plurality of pieces to be welded are arranged so that the pipe rotates about the central axis of the pipe relative to the plurality of members to be joined. A rotation drive unit that rotates at least one of the joining members;
With
Tube expansion joint tool
A die having a wedge hole portion and divided into a plurality of die segments in the circumferential direction around the wedge hole portion is arranged apart from each other in the axial direction, and one of the two dies adjacent to each other. A die connected body in which each die segment of the die and each die segment of the other die are connected to each other via a connecting rod;
A mandrel having a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body, wherein the plurality of wedge portions are formed apart from each other in the axial direction;
An apparatus for joining a pipe and a plurality of members to be joined.

  [14] The pipe and the member to be joined are characterized in that the member to be joined is expanded and joined to the pipe and friction-welded in a state where the pipe is inserted into the insertion hole provided in the member to be joined. Bonding structure.

  The present invention has the following effects.

  In this specification, the joint strength between the pipe and the member to be joined against the load in the circumferential direction of the pipe is called “torsional strength”, and the joint strength between the pipe and the member to be joined against the load in the axial direction of the pipe is referred to as “pull strength”. "

  In the invention of [1], since the pipe and the member to be joined are subjected to the friction welding at the same time, the joint strength between the pipe and the member to be joined can be increased more than the case where both are joined only by the pipe expansion joining. The pipe and the member to be joined can be joined efficiently.

  In the invention of [2], since the pipes are expanded to expand the vicinity of both sides in the axial direction of the pipe insertion portion, it is possible to increase the removal strength of the member to be joined to the pipe.

  In the invention of [3], since the member to be joined is fixed in a non-rotatable manner and the pipe is supported so as to be driven to rotate, a rotation driving device for driving the member to be rotated and a rotation driving device for driving the pipe to rotate And do not need. Therefore, the structure of the joining apparatus which joins a to-be-joined member to a pipe can be simplified.

  Furthermore, since the member to be joined is fixed so as not to rotate, it is possible to easily set the joining position of the member to be joined to the pipe.

  In the invention of [4], since the pipe is fixed so as not to rotate, there is no need for a rotational drive device for rotationally driving the pipe. Furthermore, even if the pipe is slightly bent due to bending of the pipe, the member to be joined can be rotated, and thereby the member to be joined can be uniformly joined to the pipe in the circumferential direction.

  In the invention of [5], since the pipe and the member to be joined are rotated in directions opposite to each other, the rotation speeds of the pipe and the member to be joined can be reduced. Thereby, an inexpensive apparatus can be used as the rotational drive apparatus for rotationally driving the pipe and the member to be joined.

  In the invention of [6], the circumferential position of the predetermined portion of the member to be joined with respect to the pipe can be reliably set to the predetermined position.

  In the invention of [7], since the seat portion is formed at the peripheral portion of the insertion hole of the joining member, the inner peripheral surface of the insertion hole of the joined member and the pipe can be formed without increasing the thickness of the joined member. A large contact area with the outer peripheral surface can be ensured. Therefore, the weight of the joined structure can be reduced, and the joining strength between the pipe and the member to be joined can be increased.

  Further, since the pipe is expanded in a state where the amount of bulging to the outside of the seat portion is regulated by the regulating member arranged outside the seat portion of the joined member, the seat portion of the joined member is reliably elastically deformed. In other words, the plastic deformation of the seat portion is reliably prevented. Thereby, the joining strength of a pipe and a to-be-joined member can be raised reliably.

  In the invention of [8], since the seat portion is formed at the peripheral portion of the insertion hole of the joining member, the inner peripheral surface of the insertion hole of the joined member and the pipe can be formed without increasing the thickness of the joined member. A large contact area with the outer peripheral surface can be ensured. Therefore, the weight of the joined structure can be reduced, and the joining strength between the pipe and the member to be joined can be increased.

  Further, the pipe is expanded in a state where the end of the pipe is inserted into the insertion hole of the member to be joined so that the end surface of the pipe is disposed in the range from the axial intermediate portion of the insertion hole to the connecting surface of the member to be joined. Since it processes, when connecting the to-be-joined member joined to the edge part of a pipe to another member, the part by the side of the pipe end surface of the penetration part into the penetration hole of a pipe does not interfere with another member. Thereby, a to-be-joined member can be favorably connected with another member.

  Furthermore, since the pipe is expanded so that the pipe end face side vicinity portion of the insertion portion into the pipe insertion hole is engaged with the engagement recess, the pulling strength of the member to be joined to the pipe can be increased.

  In the invention of [9], the die segment includes a piece portion having one pressing convex portion, a die segment body having the other pressing convex portion, and a connecting means. Therefore, the interval between the pressing convex portion of the piece portion and the pressing convex portion of the die segment body can be set corresponding to the thickness of the member to be joined.

  In the invention [10], since the plurality of members to be joined are pipe-expanded and joined to the pipe at the same time by friction welding, the pipe and the plurality of members to be joined can be efficiently joined.

  In the invention of [11], a joining apparatus suitably used in the joining method according to the present invention can be provided.

  In the invention of [12], a joining apparatus that is suitably used for the joining method of [6] above among the joining methods according to the present invention can be provided.

  In the invention of [13], a joining apparatus that can be suitably used for the joining method according to [10] above can be provided.

  In the invention of [14], a joined structure of a pipe and a member to be joined having high joining strength can be provided.

FIG. 1 is a perspective view of a bonded structure manufactured by bonding a member to be bonded to a pipe using the bonding apparatus according to the first embodiment of the present invention. FIG. 2A is a longitudinal sectional view of the joint structure. FIG. 2B is an enlarged view of a main part of a longitudinal section of the joint structure. FIG. 3 is a schematic view of the joining apparatus. FIG. 4 is a perspective view of the pipe expansion joining tool of the joining apparatus. FIG. 5A is a side view of a die of the tube expansion joining tool. FIG. 5B is a rear view of the die. FIG. 6 is a side view of the mandrel of the tube expansion joining tool. FIG. 7 is a longitudinal sectional view showing a state before the pipe is expanded by the pipe expansion joining tool. FIG. 8 is a vertical cross-sectional view of the pipe expanded. FIG. 9 is a timing chart of the operation of the joining apparatus when joining a member to be joined to a pipe using the joining apparatus. FIG. 10 is a longitudinal sectional view for explaining the dimensions of the main portions of the die and mandrel of the tube expansion joining tool. FIG. 11A is a front view of a part of a member to be bonded, illustrating an example of a method for fixing the member to be bonded in a non-rotatable manner. FIG. 11B is a front view of a part of the member to be joined, showing another example of a method for fixing the member to be joined in a non-rotatable manner. FIG. 12 is a schematic view of a joining device according to a first modification of the first embodiment. FIG. 13 is a timing chart of the operation of the joining device when joining the member to be joined to the pipe using the joining device. FIG. 14 is a schematic diagram of a bonding apparatus according to a second modification of the first embodiment. FIG. 15 is a timing chart of the operation of the joining apparatus when joining a member to be joined to a pipe using the joining apparatus. FIG. 16 is a perspective view of the tube expansion joining tool of the joining apparatus according to the second embodiment of the present invention. FIG. 17 is a longitudinal sectional view showing a state before the pipe is expanded by the pipe expansion joining tool. FIG. 18 is a vertical cross-sectional view of a pipe expanded state. FIG. 19 is a perspective view of a joint structure manufactured by joining a member to be joined to a pipe using the joining device according to the third embodiment of the present invention. FIG. 20 is a perspective view of a state before the pipe is expanded by the pipe expansion joining tool of the joining apparatus. 21A is a cross-sectional view taken along line XX in FIG. 21B is a vertical cross-sectional view taken along line YY in FIG. 21A. FIG. 22A is a cross-sectional view corresponding to FIG. 21A in a state where the pipe is expanded. 22B is a longitudinal sectional view taken along line YY in FIG. 22A. FIG. 23A is a perspective view of a bonded structure manufactured by bonding a member to be bonded to a pipe using the bonding apparatus according to the fourth embodiment of the present invention. FIG. 23B is a perspective view of the joint structure viewed from another direction. FIG. 24 is a longitudinal sectional view showing a state where the joint structure is connected to another member. FIG. 25 is a longitudinal sectional view of a state before the pipe is expanded by the pipe expansion joining tool of the same joining apparatus. FIG. 26 is a longitudinal sectional view showing a state in which the pipe is expanded. FIG. 27 is a cross-sectional view of a state before the pipe is expanded by the pipe expansion joining tool of the joining apparatus according to the fifth embodiment of the present invention. FIG. 28 is a cross-sectional view of a state before the pipe is expanded by the pipe expansion joining tool of the joining apparatus according to the sixth embodiment of the present invention. FIG. 29 is a perspective view of a bonded structure manufactured by bonding a member to be bonded to a pipe using the bonding apparatus according to the seventh embodiment of the present invention. FIG. 30 is a longitudinal sectional view of the joint structure. FIG. 31 is a perspective view of the pipe expansion joining tool of the joining apparatus. FIG. 32 is a longitudinal sectional view showing a state before the pipe is expanded by the pipe expansion joining tool. FIG. 33 is a longitudinal sectional view showing a state in which the pipe is expanded. FIG. 34 is a longitudinal cross-sectional view of a state before the pipe is expanded by the pipe expansion joining tool of the joining device according to one modification in the seventh embodiment. FIG. 35 is a perspective view of a manufactured bonded structure in which a member to be bonded is bonded to a pipe using the bonding apparatus according to the eighth embodiment of the present invention. FIG. 36 is a longitudinal sectional view showing a state in which a pipe is expanded by a tube expansion joining tool of the joining apparatus.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIGS. 1-11B is a figure explaining 1st Embodiment of this invention. In FIG. 3, 50 is a joining apparatus according to the first embodiment.

  1 and 2A, reference numeral 80 denotes a joining structure manufactured by joining a member to be joined 70 to a pipe 60 using the joining device 50 of the first embodiment.

  The pipe 60 is used for, for example, an automobile steering support beam, a steering column holder, a muffler, a frame, a propeller shaft, a suspension arm, other automobile parts, or a piping material.

  The pipe 60 is straight, and the outer peripheral surface 61a and the inner peripheral surface 61b have a circular cross section. Further, the pipe 60 has a hollow section 62 having a circular cross section extending in the axial direction (that is, the length direction). The inner diameter, outer diameter, and thickness of the pipe 60 are all set constant in the axial direction of the pipe 60. In FIG. 2A, Z is the central axis of the pipe 60.

  The pipe 60 is made of a material that can be elastically deformed and plastically deformed, and is made of, for example, metal, and more specifically, is made of aluminum (including an alloy thereof, the same applies hereinafter). However, in the present invention, the material of the pipe 60 is not limited to aluminum, and may be other metals such as iron, steel, copper, or plastic. Furthermore, the pipe 60 may be made of an extruded material or a drawn material, or may be manufactured by other methods.

  The member 70 to be joined is used as, for example, a flange attached to another member (not shown) or a bracket. The member 70 to be joined has a relatively thick plate shape, and more specifically, an annular plate shape. A fastener insertion hole 74 such as a bolt insertion hole is provided on the outer peripheral portion of the joined member 70 as an attachment portion attached to another member. However, in this invention, the to-be-joined member 70 is not limited to what is used as a flange or a bracket, In addition, you may have a stay, for example.

  The joined member 70 is made of an elastically deformable material, and is made of, for example, metal, and more specifically, made of aluminum. However, in the present invention, the material of the member to be joined 70 is not limited to aluminum, but may be a metal such as iron, steel, copper, or plastic, for example. . Furthermore, the member 70 to be joined may be made of an extruded material, a drawn material, or a rolled material, or may be manufactured by other methods.

  An insertion hole 71 through which the pipe 60 is inserted is provided through the center portion of the member to be joined 70. The cross-sectional shape of the insertion hole 71 is a shape corresponding to the cross-sectional shape of the outer peripheral surface 61a of the pipe 60, that is, a circular shape.

  The length of the pipe 60 is set, for example, within a range of 50 to 2000 mm, the inner diameter thereof is set, for example, within a range of 20-100 mm, and the wall thickness thereof is set, for example, within a range of 0.5-5 mm.

  However, in the present invention, the dimensions of the pipe 60 are not limited to being within the above-described range, and are variously set according to the purpose of use of the pipe 60.

  The outer diameter of the joined member 70 is set within a range of 30 to 100 mm, for example. The diameter of the insertion hole 71 of the member 70 to be joined is set to be, for example, 0.1 to 1 mm larger than the outer diameter of the pipe 60 in a state before the pipe expansion process. Thereby, the pipe 60 can be inserted into the insertion hole 71 in a loosely inserted manner. When the length along the pipe axis direction of the inner peripheral surface 72 of the insertion hole 71 of the member to be joined 70 is the width of the inner peripheral surface 72 (see FIG. 10, W1), the width of the inner peripheral surface 72 is, for example, 2 It is set within a range of ˜50 mm.

  However, in this invention, each dimension of each part of the to-be-joined member 70 is not limited to being in said range, but is set variously according to the intended purpose of the to-be-joined member 70. .

  As shown in FIGS. 1 and 2B, in this joined structure 80, the welded member 70 is expanded and joined to the pipe 60 while the pipe 60 is inserted into the insertion hole 71 of the joined member 70, and friction welding is performed. Has been. The friction welding is also called “friction welding”.

  The configuration of the joint structure 80 will be described in detail as follows.

  As shown in FIG. 2B, the insertion portion 63 of the pipe 60 into the insertion hole 71 is expanded so that the outer peripheral surface 61 a of the insertion portion 63 becomes the inner peripheral surface 72 of the insertion hole 71 of the joined member 70. The pipe 60 is plastically deformed so as to bulge outward in the radial direction so as to come into pressure contact. And the force in the radial direction of the pipe 60 is always acting on the to-be-joined member 70 by the elastic restoring force of the to-be-joined member 70 accumulated at the time of this pipe expansion process. Further, the outer peripheral surface 61 a of the insertion portion 63 of the pipe 60 and the inner peripheral surface 72 of the insertion hole 71 are friction-welded. Therefore, the member 70 to be joined is joined to the pipe 60 very firmly. In FIG. 2B, J is a friction welding part formed by friction-welding the to-be-joined member 70 to the pipe 60. FIG. In FIG. 2B, the friction welding portion J is indicated by dot hatching so that it can be easily distinguished from other members.

  Further, in the entire length region of the pipe 60, the axially adjacent side portions 64, 64 of the insertion portion 63 of the pipe 60 are locally expanded in the radially outward direction of the pipe 60 by being expanded. It is plastically deformed. Therefore, a bulging portion S for retaining that has an arcuate cross section is formed in each neighboring portion 64 so as to extend in the circumferential direction of the pipe 60. The member 70 to be joined is joined to the pipe 60 in a state of being sandwiched between the bulging portions S and S in the axial direction of the pipe 60. Therefore, the detachment strength of the joined member 70 with respect to the pipe 60 is enhanced by the bulging portions S and S. The bulging amount of the bulging portion S is, for example, 0.5 to 10 mm. The width of the bulging portion is, for example, 1 to 30 mm.

  In the present invention, the cross-sectional shape of the bulging portion S is not limited to an arc shape, but may be a triangular shape, a quadrangular shape, or the like. Furthermore, the bulging amount and the width of the bulging portion S are not limited to being within the above range.

  Next, the structure of the joining apparatus 50 of 1st Embodiment is demonstrated below.

  As shown in FIG. 3, the joining device 50 includes a tube expansion joining tool 51, a rotation driving unit 40, and the like.

  The pipe expansion joining tool 51 includes a die 10, a mandrel 30, and the like.

  As shown in FIGS. 4 to 5B, the die 10 is substantially cylindrical. Therefore, the cross-sectional shape of the die 10 is substantially circular. Further, a support portion 15 that supports the die 10 is integrally formed at the base end portion of the die 10 so as to extend in the axial direction of the die 10. The die 10 is made of, for example, tool steel or cemented carbide.

  At the center of the die 10, a wedge hole 14 is provided coaxially with the center axis Q of the die 10 and penetrating in the axial direction of the die 10 and the support 15. The wedge hole portion 14 has a conical shape or a polygonal pyramid shape. In the first embodiment, the wedge hole portion 14 has a polygonal pyramid shape. Therefore, the cross-sectional shape of the wedge hole portion 14 is a regular square shape (see FIG. 5B).

  Further, the die 10 is equally divided into a plurality of die segments 11 in the circumferential direction around the wedge hole portion 14, and accordingly, the support portion 15 is also equally distributed in the circumferential direction around the wedge hole portion 14. It is divided into a plurality of support section segments 16. In the first embodiment, the number of divisions of the die 10 and the support portion 15 is four. Each support segment 16 is integrally formed with each die segment 11.

  Further, on the base end surface side of the support portion 15 of the die 10, a holding base body 17 that holds a plurality of (four in the first embodiment) die segments 11 and support portion segments 16 in a combined state is disposed. Has been. As shown in FIGS. 5A and 5B, a through hole 17 a communicating with the wedge hole portion 14 is provided in the central portion of the holding base 17 so as to penetrate in the axial direction. Further, around the through hole 17 a in the holding base 17, a plurality of (four in the first embodiment) bolt insertion holes 17 b made of elongated holes extending in the radial direction of the holding base 17 are arranged around the periphery of the holding base 17. It is evenly arranged in the direction. The connection bolts 18 are inserted into the respective bolt insertion holes 17 b, and the front ends of the connection bolts 18 are screwed into the screw holes 16 a provided in the support portion segments 16. As a result, the die segment 11 and the support portion segment 16 are held by the holding base 17 so as to be movable in the radial direction of the die 10 while the plurality of die segments 11 and the support portion segment 16 are combined into one. ing.

  As shown in FIG. 6, the mandrel 30 has a wedge portion 31 corresponding to the wedge hole portion 14 of the die 10. The wedge portion 31 is made of, for example, tool steel or cemented carbide, and is integrally formed in a tapered shape at the distal end portion of the mandrel 30. The wedge portion 31 has a conical shape or a polygonal pyramid shape. In the first embodiment, the wedge portion 31 has a polygonal pyramid shape. Therefore, the cross-sectional shape of the wedge part 31 is a regular square shape. The taper angle of the wedge portion 31 is set to be equal to the taper angle of the wedge hole portion 14 of the die 10 and is set within a range of 1 to 30 °, for example. However, in the present invention, the taper angles of the wedge part 31 and the wedge hole part 14 are not limited to being in the above range.

  As shown in FIG. 3, a mandrel driving unit 33 that moves the mandrel 30 in a direction in which the wedge portion 31 is inserted into the wedge hole portion 14 of the die 10 is provided at the base end portion of the mandrel 30 with a bearing (for example, a thrust ball bearing). ) 32. In the first embodiment, the mandrel driving part 33 moves the wedge part 31 in the insertion direction with respect to the wedge hole part 14 by pressing the mandrel 30, and a hydraulic cylinder (not shown) is used as the drive source. have. As shown in FIGS. 3 and 6, a mandrel 30 is connected to the tip of a drive rod 33a of the hydraulic cylinder via a bearing 32 so as to be rotatable about its central axis.

  As shown in FIGS. 7 and 8, the mandrel 30 inserts the wedge part 31 into the wedge hole part 14 of the die 10 disposed in the hollow part 62 of the pipe 60, thereby connecting each die segment 11 of the die 10 to the pipe. 60 is moved outward in the radius direction.

  The mandrel drive unit 33 has a control unit (not shown) that controls the amount of insertion of the wedge portion 31 into the wedge hole portion 14, that is, the amount of pressing stroke of the drive rod 33a of the hydraulic cylinder. The amount of movement of the die segment 11 in the radially outward direction of the pipe 60 is adjusted by controlling the pressing stroke amount by the control unit of the mandrel driving unit 33.

  Each die segment 11 of the die 10 is moved in the radially outward direction of the pipe 60 by the wedge portion 31 of the mandrel 30, thereby pressing the insertion portion 63 and both neighboring portions 64, 64 of the pipe 60 in the radially outward direction, Thereby, these portions 63, 64, 64 are plastically deformed and expanded.

  As shown in FIG. 4, two pressing protrusions 12 extending in the circumferential direction of the die 10 are formed on the pressing surface of the die segment 11 (that is, the outer surface facing the pipe inner peripheral surface 61 b side of each die segment 11). , 12 are formed apart from each other in the axial direction of the die 10. The cross-sectional shape of the pressing convex portion 12 is an arc shape. Further, a pressing portion 13 is formed between the first pressing convex portions 12 and 12 on the pressing surface of the die segment 11.

  As shown in FIG. 8, both pressing protrusions 12, 12 press the adjacent portions 64, 64 on both sides of the insertion portion 63 of the pipe 60 during the pipe expansion process, and the shape and dimensions thereof. Are set equal to each other.

  The pressing portion 13 presses the insertion portion 63 of the pipe 60 in the radially outward direction of the pipe 60 during the pipe expansion process.

  When the pipe 60 is expanded by the pipe expansion joining tool 51, the rotation drive unit 40 of the joining apparatus 50 is configured so that the pipe 60 rotates relative to the member to be joined 70 around the central axis Z of the pipe 60. At least one of the pipe 60, the pipe expansion joining tool 51, and the member 70 to be joined is rotationally driven. In the first embodiment, as shown in FIG. 3, the rotation driving unit 40 rotates the tube expansion joining tool 51 (that is, the die 10 and the mandrel 30) instead of the member 70 and the pipe 60. That is, the rotation drive unit 40 is connected to the pipe expansion joining tool 51 via a driving force transmission endless belt 45 as a driving force transmission means. The belt 45 is stretched over and attached to a drive wheel 46 provided on the drive shaft 41 a of the rotational drive unit 40 and a driven wheel 47 attached to the outer peripheral portion of the holding base 17 of the die 10.

  The rotation drive unit 40 includes a rotation drive source 41 and a control unit 44.

  The rotational drive source 41 is composed of a drive motor, for example. The rotational driving force of the rotational driving source 41 is transmitted to the pipe expansion joining tool 51 via the driving force transmission belt 45.

  The control unit 44 controls rotation and includes a clutch 42 and a brake 43. The clutch 42 connects and disconnects the driving force of the rotational drive source 41. The brake 43 stops rotation. Then, the control unit 44 controls and stops the rotation so that the circumferential position of the predetermined portion of the bonded member 70 with respect to the pipe 60 becomes a predetermined position by operating at least the brake 43 of the clutch 42 and the brake 43. It can be made to be. In the first embodiment, the predetermined portion of the bonded member 70 is, for example, the fastener insertion hole 74. The predetermined position is, for example, an upper position or a lower position of the pipe 60. However, in the present invention, the predetermined portion of the member to be joined 70 is not limited to the fastener insertion hole 74, and the predetermined position is not limited to the upper position or the lower position of the pipe 60. Absent.

  Next, the joining method of the pipe 60 and the to-be-joined member 70 using the said joining apparatus 50 is demonstrated below.

  As shown in FIG. 7, the pipe 60 is inserted into the insertion hole 71 of the joined member 70. The member 70 to be joined is fixed to the pipe 60 in a non-rotatable manner around the central axis Z of the pipe 60 by a fixing means (not shown). A method for fixing the bonded member 70 will be described later. Further, the pipe 60 is supported by a pipe support means (not shown) so as to be driven to rotate about the central axis Z of the pipe 60. The die 10 of the pipe expansion joining tool 51 is disposed at a position corresponding to the member 70 to be joined in the hollow portion 62 of the pipe 60. In this state, the die 10 is arranged so that its central axis Q coincides with the central axis Z of the pipe 60 (that is, Z = Q). Further, the mandrel 30 of the pipe expansion joining tool 51 is arranged so that the central axis of the wedge portion 31 coincides with the central axis Z of the pipe 60.

Then, by operating the rotation drive unit 40, the die 10 and the mandrel 30 of the pipe expansion joining tool 51 are integrally rotated about the central axis Z of the pipe 60. The rotational speeds of the die 10 and the mandrel 30 are set to be equal to each other, and are set within a range of, for example, 100 to 3000 min ⁻¹ (rpm). The rotation directions of the die 10 and the mandrel 30 are the same.

  Next, the mandrel driving part 33 is operated to insert the wedge part 31 of the mandrel 30 into the wedge hole part 14 of the die 10. As a result, as shown in FIG. 8, each die segment 11 of the die 10 is moved in the radially outward direction of the pipe 60 and comes into contact with the inner peripheral surface 61 b of the pipe 60. Then, the pipe 60 is driven and rotated about the central axis Z according to the rotation operation of the die 10. By continuously inserting the wedge portion 31 of the mandrel 30 into the wedge hole portion 14 while rotating the pipe 60 in this manner, the outer peripheral surface 61a of the insertion portion 63 of the pipe 60 is changed to the inner periphery of the insertion hole 71 of the member 70 to be joined. The pipe 60 is pressed radially outward by each die segment 11 of the die 10 so as to be in pressure contact with the surface 72. The pressing is performed until the insertion portion 63 and the adjacent portions 64 and 64 of the pipe 60 are plastically deformed. As a result, the pipe 60 is expanded, and as a result, the welded member 70 is expanded and joined to the pipe 60 at the same time as the friction welding. Thereafter, the wedge portion 31 of the mandrel 30 is extracted from the wedge hole portion 14 of the die 10.

  In this joining method, at the time of pipe expansion processing, the insertion portion 63 of the pipe 60 is pressed and plastically deformed by the pressing portion 13 of each die segment 11 so as to bulge outward in the radial direction of the pipe 60. Further, as the insertion portion 63 of the pipe 60 is swelled in this manner, the member to be joined 70 is pressed outward in the radial direction of the pipe 60 and elastically deformed. Thereby, an elastic restoring force is accumulated in the bonded member 70. Both side vicinity portions 64 and 64 of the insertion portion 63 of the pipe 60 are pressed and plastically deformed by the both pressing convex portions 12 and 12 of each die segment 11 in a state of bulging outward of the pipe 60 in the radial direction. As a result, a bulging portion S having an arcuate cross section is formed in each of the neighboring portions 64 so as to extend in the circumferential direction of the pipe 60. When the wedge portion 31 of the mandrel 30 is pulled out from the wedge hole portion 14 of the die 10, a force in the radial direction of the pipe 60 acts on the member to be joined 70 by the elastic restoring force of the member to be joined 70.

  Further, when the outer peripheral surface 61 a of the insertion portion 63 of the pipe 60 comes into contact with the inner peripheral surface 72 of the insertion hole 71 of the joined member 70 during tube expansion processing, the outer peripheral surface 61 a of the insertion portion 63 is changed to the inner periphery of the insertion hole 71. It slides on the surface 72 in the circumferential direction of the pipe 60. Thereby, the thin natural oxide films formed on the surfaces 61 a and 72 are removed, and frictional heat is generated between the surfaces 61 a and 72. Due to this frictional heat, the insertion portion 63 and the member to be joined 70 are softened at the contact portions between the outer peripheral surface 61 a of the insertion portion 63 and the inner peripheral surface 72 of the insertion hole 71. And the outer peripheral surface 61a of the insertion part 63 is press-contacted with the inner peripheral surface 72 of the insertion hole 71, so that the softened part of the insertion part 63 and the softened part of the member 70 to be joined are fused together. The member 70 to be joined is friction-welded to the pipe 60.

  FIG. 9 shows a timing chart of the operation of the joining device 50 (that is, the pipe expansion joining tool 51 and the rotation driving unit 40) in the joining method.

  In FIG. 9, “A” → “B” → “C” → “D” → “E” sequentially show the joining process in the joining method. “A” is before tube expansion processing. “B” is when the die segment 11 of the die 10 comes into contact with the inner peripheral surface 61 b of the pipe 60. “C” is when the outer peripheral surface 61 a of the insertion portion 63 of the pipe 60 is in pressure contact with the inner peripheral surface 72 of the insertion hole 71 of the member to be joined 70. “D” is when pipe expansion processing (that is, pipe expansion joining) is completed. “E” is when the wedge portion 31 of the mandrel 30 is extracted from the wedge hole portion 14 of the die 10.

  When “A”, the rotation of the die 10 and the mandrel 30 is started [start of rotation]. On the other hand, the member 70 to be joined is fixed so as not to rotate [rotation fixing]. The pipe 60 is supported in a freely rotatable manner.

  When “B”, the rotation of the die 10 and the mandrel 30 is maintained [maintenance of rotation]. Then, when the die segment 11 of the die 10 contacts the inner peripheral surface 61b of the pipe 60, the pipe 60 is driven to rotate in accordance with the rotating operation of the die 10 [driven rotation].

  When joining the member to be welded 70 to the pipe 60 so that the circumferential position of the fastener insertion hole 74 of the member to be joined 70 with respect to the pipe 60 becomes a predetermined position, the position between “C” to “D” At least the brake 43 is operated among the clutch 42 and the brake 43 of the control unit 44 of the rotation drive unit 40 so that the circumferential position of the fastener insertion hole 74 of the member 70 to be joined to the pipe 60 becomes a predetermined position. As a result, the rotation of the die 10 and the mandrel 30 is controlled to be stopped rapidly [control stop]. The pipe 60 rotates in accordance with the rotating operation of the die 10 and the mandrel 30. Therefore, when the rotation of the die 10 and the mandrel 30 is stopped, the rotation of the pipe 60 is also stopped.

  On the other hand, when it is not necessary to join the member 70 to the pipe 60 so that the circumferential position of the fastener insertion hole 74 of the member 70 to the pipe 60 is a predetermined position, The rotation of the die 10 and the mandrel 30 is maintained [rotation maintenance]. When “D”, the rotation of the die 10 and the mandrel 30 is freed by interrupting the transmission of the driving force of the rotational drive source 41 by operating the clutch 42 of the control unit 44 of the rotational drive unit 40 [freedom. rotation]. In the present invention, the transmission of the driving force by the clutch 42 may be interrupted not only at “D” but also at “C”. The pipe 60 rotates in accordance with the rotating operation of the die 10 and the mandrel 30. Therefore, if the rotation of the die 10 and the mandrel 30 is made free, the rotation of the pipe 60 is also made free.

  In the first embodiment, since the welded member 70 is expanded and joined to the pipe 60 at the same time as the friction welding, the joining strength between the pipe 60 and the joined member 70 can be increased more than when both are joined only by the expanded pipe joining. In addition, the pipe 60 and the member to be joined 70 can be joined efficiently.

  Furthermore, even if the material of the pipe 60 and the material of the member 70 to be joined are the same or different, the member 70 to be joined can be firmly joined to the pipe 60.

  Furthermore, since the pipe 60 is expanded, the portions 64 and 64 on both sides of the insertion portion 63 of the pipe 60 are swelled, so that the removal strength of the joined member 70 with respect to the pipe 60 can be increased.

  Further, since the member to be joined 70 is fixed so as not to rotate, and the pipe 60 is supported so as to be driven to rotate, a rotation driving device that drives the member 70 to rotate, and a rotation driving device that drives the pipe 60 to rotate. Do not need. Therefore, the structure of the joining apparatus 50 which joins the to-be-joined member 70 to the pipe 60 can be simplified.

  Furthermore, since the member 70 to be joined is fixed so as not to rotate, the joining position of the member 70 to be joined to the pipe 60 can be easily set.

  Thus, in the above joining method, the tube expansion process is performed so as to satisfy at least one of the following first relational expression (1), second relational expression (2), and third relational expression (3). More preferably, it is performed so as to satisfy two of these three relational expressions, and most desirably, it is performed so as to satisfy all of these three relational expressions.

First relational expression (1): 1 <(D + D1 + t) / D2 Expression (1)
Second relational expression (2): 1.0 ≦ W2 / (W1 + 2t) ≦ 3.0 (2)
Third relational expression (3): 1.0 <(D + D1 + D3) /DP≦1.2 Expression (3).

  Here, in each of the relational expressions (1), (2), and (3), t, D, D1, D2, D3, DP, W1, and W2 are as follows as shown in FIG.

  t is the thickness of the pipe 60.

  D is the amount of movement of the die segment 11 in the radially outward direction of the pipe 60.

  D1 is the distance from the central axis Z of the pipe 60 to the pressing portion 13 of the die segment 11.

  D2 is the distance from the central axis Z of the pipe 60 to the inner peripheral surface 72 of the insertion hole 71 of the member 70 to be joined.

  D3 is the height of the top portion of the pressing convex portion 12 with respect to the pressing portion 13 of the die segment 11.

  DP is the distance from the central axis Z of the pipe 60 to the inner peripheral surface 61 b of the pipe 60, that is, the radius of the pipe 60.

  W1 is the width of the inner peripheral surface 72 of the insertion hole 71 of the member to be joined 70 that contacts the outer peripheral surface 61a of the pipe 60 in the initial stage of joining.

  W <b> 2 is the distance between the tops of both pressing protrusions 12, 12 of the die segment 11.

  Here, in the first embodiment, as described above, the die 10 is disposed in the hollow portion of the pipe 60 so that the center axis Q of the die 10 coincides with the center axis Z of the pipe 60 at the time of pipe expansion processing. In other words, D1 is the distance from the central axis Q of the die 10 to the pressing portion 13 of the die segment 11.

  By satisfying the first relational expression (1), the inner peripheral surface 72 of the insertion hole 71 of the member to be joined 70 is reliably pressed in the radially outward direction of the pipe 60 during tube expansion processing. As a result, an elastic restoring force can be reliably generated in the bonded member 70. Thereby, the joining strength of the pipe 60 and the to-be-joined member 70 can be raised reliably.

  The upper limit value on the right side of the first relational expression (1) is not particularly limited, but it is particularly preferable that the upper limit value be a value at which the bonded member 70 is deformed within the elastic deformation region at the time of pipe expansion processing. In other words, in the present invention, the deformed form of the member 70 to be joined by pipe expansion is not plastic deformation but elastic deformation, that is, under the condition that the member to be joined 70 is elastically deformed without plastic deformation by pipe expansion. Therefore, it is particularly desirable to satisfy the first relational expression (1). Specifically, the upper limit value on the right side of the first relational expression (1) is preferably 1.2 (particularly preferably 1.1).

  In the first relational expression (1), the die segment 11 may have the pressing convex portion 12 or may not have the pressing convex portion 12. However, in the joined structure 80, when the removal strength of the joined member 70 with respect to the pipe 60 is required to be high, it is desirable that the die segment 11 has the pressing protrusion 12.

  The movement amount of the die segment 11 in the radially outward direction of the pipe 60 is adjusted by controlling the amount of insertion of the wedge portion 31 into the wedge hole portion 14 by the mandrel driving portion 33.

  By satisfying the second relational expression (2), the joining strength between the pipe 60 and the member to be joined 70 can be reliably increased.

  A particularly desirable relational expression (2a) in the second relational expression (2) is as follows.

  1.0 ≦ W2 / (W1 + 2t) ≦ 1.5 Formula (2a)

  By satisfying the third relational expression (3), the joining strength between the pipe 60 and the member to be joined 70, particularly the pulling strength of the joined member 70 with respect to the pipe 60 can be further reliably increased, and the tube expansion process is performed. It is possible to reliably prevent the pipe 60 from being broken at the time.

  Particularly desirable relational expression (3a) in the third relational expression (3) is as follows.

  1.1 ≦ (D + D1 + D3) /DP≦1.2 Formula (3a)

  In the first embodiment, the width W3 of the pressing protrusion 12 of the die segment 11 is not particularly limited, and is set within a range of 3 to 30 mm, for example.

  11A and 11B are diagrams illustrating a method for fixing the member 70 to be non-rotatable during tube expansion processing.

  In FIG. 11A, an engagement recess 19 a that is recessed from the outer periphery toward the center of the member to be bonded 70 is provided on the outer periphery of the member to be bonded 70. In the engagement recess 19a, a fixing pin 90 as a fixing means for fixing the member 70 to be non-rotatable is detachably fitted and engaged. As a result, the member 70 is connected to the pipe 60. The center axis Z is fixed so as not to rotate. At the time of pipe expansion processing, the member 70 to be joined is moved in the radially outward direction of the pipe 60 with the fixing pin 90 fitted and engaged in the engagement recess 19a.

  In FIG. 11B, an engagement long hole 19 b extending in the radial direction of the member to be bonded 70 is provided in the outer peripheral portion of the member to be bonded 70. The fixing pin 90 is detachably fitted and engaged in the engagement long hole 19b, whereby the member 70 is fixed so as not to rotate about the central axis Z of the pipe 60. . At the time of pipe expansion processing, the member 70 to be joined is moved in the radially outward direction of the pipe 60 with the fixing pin 90 fitted and engaged in the engagement long hole 19b.

  Here, in the said 1st Embodiment, as shown in FIG. 3, the rotational drive part 40 is connected to the pipe expansion joining tool 51 (namely, die | dye 10 and the mandrel 30), and the pipe expansion joining tool 51 is rotationally driven. The pipe 60 is driven to rotate by bringing the die segment 11 of the die 10 into contact with the inner peripheral surface 61 b of the pipe 60. However, in the present invention, the rotation driving unit 40 may be connected to the pipe 60 instead of the pipe expansion joining tool 51 to rotate the pipe 60. In this case, the die 10 and the mandrel 30 of the pipe expansion joining tool 51 are supported by the pipe expansion joining tool support means so as to be driven to rotate about the central axis Z of the pipe 60. The die 10 and the mandrel 30 are driven to rotate in accordance with the rotating operation of the pipe 60 when the die segment 11 of the die 10 contacts the inner peripheral surface 61 b of the pipe 60. Further, in the present invention, the rotation drive unit 40 may be connected to the pipe expansion joining tool 51 and the pipe 60, respectively, and rotate the pipe expansion joining tool 51 and the pipe 60 in the same direction at the same speed.

  12 and 13 are diagrams showing a timing diagram of the bonding apparatus 50 and its operation according to the first modification in the first embodiment. FIGS. 12 and 13 correspond to FIGS. 3 and 9, respectively. In these drawings, the same reference numerals are assigned to the same elements as those in the first embodiment.

  In FIG. 12, the rotation driving unit 40 drives the member 70 to be rotated about the central axis Z of the pipe 60. The joined member 70 is held in a fixed state by the holding member 78 by being fitted into the annular holding member 78. In this state, the holding member 78 is not in contact with the pipe 60. The rotation driving unit 40 is connected to the holding member 78 via the driving force transmission belt 45. That is, the belt 45 is stretched over and attached to the drive wheel 46 of the rotation drive unit 40 and the driven wheel part 78 a formed integrally with the holding member 78. The driving force of the rotation drive source 41 of the rotation drive unit 40 is transmitted to the holding member 78 via the belt 45, whereby the holding member 78 and the joined member 70 are integrated around the central axis Z of the pipe 60. Driven by rotation. On the other hand, the pipe 60 and the pipe expansion joining tool 51 (that is, the die 10 and the mandrel 30) are fixed so as not to rotate about the central axis Z of the pipe 60.

  As shown in FIG. 13, the joining apparatus 50 according to the first modification shown in FIG. 12 is operated as follows.

  When “A”, the die 10 and the mandrel 30 are fixed so as not to rotate [rotation fixing]. The pipe 60 is also fixed so as not to rotate [fixed rotation].

When it is between “A” and “B”, the rotation of the member to be joined 70 is started [start of rotation]. The rotational speed of the member to be joined 70 is set, for example, within a range of 100 to 3000 min ⁻¹ (rpm).

  When joining the member to be welded 70 to the pipe 60 so that the circumferential position of the fastener insertion hole 74 of the member to be joined 70 with respect to the pipe 60 becomes a predetermined position, the position between “C” to “D” At least the brake 43 is operated among the clutch 42 and the brake 43 of the control unit 44 of the rotation drive unit 40 so that the circumferential position of the fastener insertion hole 74 of the member 70 to be joined to the pipe 60 becomes a predetermined position. Thus, the rotation of the member to be joined 70 is controlled and stopped rapidly [control stop].

  On the other hand, when it is not necessary to join the member 70 to the pipe 60 so that the circumferential position of the fastener insertion hole 74 of the member 70 to the pipe 60 is a predetermined position, The rotation of the member to be joined 70 is maintained [maintenance of rotation]. When “D”, the transmission of the driving force of the rotation drive source 41 is interrupted by operating the clutch 42 of the control unit 44 of the rotation drive unit 40, thereby freeing the rotation of the member 70 to be joined [free rotation. ]. The transmission of the driving force by the clutch 42 may be interrupted not only at “D” but also at “C”.

  In the joining method shown in FIGS. 12 and 13, since the pipe 60 is fixed so as not to rotate, a rotation driving device for rotating the pipe 60 is not required. Furthermore, even if the pipe 60 is slightly bent due to bending of the pipe 60 or the like, it is possible to rotate the member to be joined 70, so that the member to be joined 70 is made uniform on the pipe 60 in the circumferential direction of the pipe 60. Can be joined.

  FIGS. 14 and 15 are diagrams showing a timing diagram of the bonding apparatus 50 and its operation according to the second modification of the first embodiment. FIGS. 14 and 15 correspond to FIGS. 3 and 9, respectively. In these drawings, the same elements as those in the first embodiment are denoted by the same reference numerals.

  In FIG. 14, the joining device 50 includes a first rotation drive unit 40 </ b> A that rotationally drives the pipe expansion joining tool 51, and a second rotation drive unit 40 </ b> B that rotationally drives the member 70 to be joined. The configuration of the first rotation drive unit 40A is the same as that of the first embodiment shown in FIG. 3, that is, the first rotation drive unit 40A transmits the driving force to the pipe expansion joining tool 51 (that is, the die 10 and the mandrel 30). They are connected via a belt 45. The configuration of the second rotation driving unit 40B is the same as that of the first modification shown in FIG. 12, that is, the second rotation driving unit 40B is connected to the holding member 78 via the driving force transmission belt 45. . The rotation direction of the die 10 and the mandrel 30 by the first rotation drive unit 40A and the rotation direction of the member 70 to be joined by the second rotation drive unit 40B are opposite to each other. The pipe 60 is supported by a pipe support means (not shown) so as to be driven to rotate about the central axis Z of the pipe 60.

  As shown in FIG. 15, the joining apparatus of the second modification shown in FIG. 14 is operated as follows.

When “A”, the rotation of the die 10 and the mandrel 30 is started [start of rotation]. The rotational speed of the die 10 and the mandrel 30 is, for example, 50 to 1500 min ⁻¹ (rpm). The pipe 60 is supported in a freely rotatable manner.

  When “B”, the rotation of the die 10 and the mandrel 30 is maintained [maintenance of rotation]. Then, when the die segment 11 of the die 10 contacts the inner peripheral surface 61b of the pipe 60, the pipe 60 is driven to rotate in accordance with the rotating operation of the die 10 [driven rotation].

When it is between “A” and “B”, the rotation of the member to be joined 70 is started [start of rotation]. The rotation direction of the member 70 is opposite to the rotation direction of the die 10 and the mandrel 30. The rotational speed of the bonded member 70 is, for example, 50 to 1500 min ⁻¹ (rpm).

  When joining the member to be welded 70 to the pipe 60 so that the circumferential position of the fastener insertion hole 74 of the member to be joined 70 with respect to the pipe 60 becomes a predetermined position, the position between “C” to “D” At this time, the clutch 42 and the brake of the control unit 44 of the first rotation driving unit 40A and the second rotation driving unit 40B are set so that the circumferential position of the fastener insertion hole 74 of the joined member 70 with respect to the pipe 60 becomes a predetermined position. By operating at least the brake 43 among 43, the rotation of the die 10 and the mandrel 30 is controlled and rapidly stopped, and the rotation of the bonded member 70 is controlled and rapidly stopped [control stop].

  On the other hand, when it is not necessary to join the member 70 to the pipe 60 so that the circumferential position of the fastener insertion hole 74 of the member 70 to the pipe 60 is a predetermined position, The rotation of the die 10 and the mandrel 30 is maintained and the rotation of the bonded member 70 is maintained [rotation maintenance]. When “D”, the transmission of the driving force of each of the rotational drive sources 41 and 41 is interrupted by operating the clutch 42 of the control unit 44 of the first rotational drive unit 40A and the second rotational drive unit 40B, respectively. The rotation of the die 10 and the mandrel 30 is made free and the rotation of the joined member 70 is made free [free rotation]. The transmission of each driving force by the clutch 42 may be interrupted not only at “D” but also at “C”.

  In the joining method shown in FIGS. 14 and 15, the pipe 60 and the member to be joined 70 are rotated in opposite directions, so that the rotation speeds of the pipe 60 and the member to be joined 70 can be reduced. Thereby, an inexpensive apparatus can be used as the first rotation driving unit 40A and the second rotation driving unit 40B, respectively.

  Here, in the said 2nd modification, 40 A of 1st rotation drive parts are connected to the pipe expansion joining tool 51 (namely, die | dye 10 and the mandrel 30), the pipe expansion joining tool 51 is rotationally driven, and the die segment of the die | dye 10 is used. 11 is brought into contact with the inner peripheral surface 61 b of the pipe 60 to rotate the pipe 60 in a driven manner. However, in the present invention, the first rotation drive unit 40A may be connected to the pipe 60 instead of the pipe expansion joining tool 51 to rotationally drive the pipe 60. In this case, the die 10 and the mandrel 30 of the pipe expansion joining tool 51 are supported so as to be driven to rotate about the central axis Z of the pipe 60. The die 10 and the mandrel 30 are driven to rotate in accordance with the rotating operation of the pipe 60 when the die segment 11 of the die 10 contacts the inner peripheral surface 61 b of the pipe 60. Furthermore, in this invention, 40 A of 1st rotation drive parts may be connected to the pipe expansion joining tool 51 and the pipe 60, respectively, and may rotate the pipe expansion joining tool 51 and the pipe 60 at the same speed in the same direction, respectively. .

Second Embodiment
16-18 is a figure explaining 2nd Embodiment of this invention. In these drawings, the same reference numerals are assigned to the same elements as those in the first embodiment. The second embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIG. 16, in the joining apparatus 50 of 2nd Embodiment, the division | segmentation number of the die | dye 10 and the support part 15 of the pipe expansion joining tool 51 is eight. The cross-sectional shape of the wedge hole portion 14 of the die 10 is a regular octagonal shape. The cross-sectional shape of the wedge portion 31 of the mandrel 30 of the pipe expansion joining tool 51 is a regular octagonal shape.

  Each die segment 11 of the die 10 includes a piece portion 20, a die segment main body 21, a spacer 22, and a connecting bolt 23 as connecting means.

  The piece portion 20 has one pressing convex portion 12 of the two pressing convex portions 12 and 12 of the die segment 11.

  The die segment main body 21 is formed separately from the piece portion 20 and has the other pressing convex portion 12. The die segment main body 21 abuts on the outer peripheral surface of the wedge portion 31 of the mandrel 30 during tube expansion processing and It is moved outward. Specifically, as shown in FIG. 17, the die segment main body 21 is integrally formed with an overhang portion 21 a that protrudes toward the piece portion 20 side. The surface of the protruding portion 21a on the wedge hole portion 14 side constitutes a part of the inner peripheral surface of the wedge hole portion 14, and is brought into contact with the outer peripheral surface of the wedge portion 31 of the mandrel 30 during tube expansion processing. The pipe 60 receives the driving force in the radially outward direction.

  The spacer 22 is disposed between the pressing convex portion 12 of the piece portion 20 and the pressing convex portion 12 of the die segment main body 21. The spacer 22 holds a distance between the pressing convex portion 12 of the piece portion 20 and the pressing convex portion 12 of the die segment main body 21 at a predetermined interval. The interval corresponding to the width of the inner peripheral surface 72 of the 70 insertion holes 71 is held. Further, the outer surface of the spacer 22 functions as a pressing portion 13 that presses the insertion portion 63 of the pipe 60 in the radially outward direction of the pipe 60.

  The connecting bolt 23 connects the piece portion 20 and the die segment main body 21 through the spacer 22 so as to be separable. The connecting bolt 23 may connect the piece 20 and the die segment body 21 so as to be separable without using the spacer 22.

  The piece portion 20 and the spacer 22 are disposed on the surface of the overhang portion 21 a of the die segment main body 21 on the opposite side to the wedge hole portion 14. In this state, the connecting bolt 23 is inserted into the bolt insertion holes 24 provided in the piece portion 20 and the spacer 22, and the tip of the connecting bolt 23 is a screw provided in the die segment body 21. Screwed into the hole 25. Thereby, the piece part 20 and the die segment main body 21 are integrally connected by the connecting bolt 23 via the spacer 22. Furthermore, by releasing the screwing of the connecting bolt 23 and the screw hole 25, the piece portion 20, the die segment main body 21, and the spacer 22 are separated from each other.

  The joining method of the pipe 60 and the to-be-joined member 70 using the joining apparatus 50 of 2nd Embodiment is the same as the said 1st Embodiment, 1st modification, or 2nd modification.

  In the joining device 50 according to the second embodiment, the piece portion 20 and the die segment main body 21 are separated, so that the piece portion 20 is pressed according to the width of the inner peripheral surface 72 of the insertion hole 71 of the member 70 to be joined. The space | interval between the convex part 12 and the press convex part 12 of the die segment main body 21 can be set. That is, for example, at least one spacer 22 is prepared so that the distance between the pressing convex portions 12 and 12 is different, and the insertion hole 71 of the member to be joined 70 is prepared from these. By selecting the spacer 22 in accordance with the width of the inner peripheral surface 72 of the inner surface 72, the spacer 22 is disposed between the pressing convex portion 12 of the piece portion 20 and the pressing convex portion 12 of the die segment body 21. The interval between the pressing convex portions 12 and 12 can be set in correspondence with the width of the inner peripheral surface 72 of the insertion hole 71 of the member to be joined 70. Therefore, this joining apparatus 50 has high versatility.

  In the present invention, the number of the spacers 22 arranged between the pressing convex portion 12 of the piece portion 20 and the pressing convex portion 12 of the die segment main body 21 is not limited to one, In addition, there may be a plurality or zero. Furthermore, the spacer 22 may be integrally formed with the piece part 20 or the die segment main body 21.

<Third Embodiment>
19 to 22B are views for explaining a third embodiment of the present invention. In these drawings, the same reference numerals are assigned to the same elements as those in the first embodiment. The third embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIG. 19, the member to be joined 70 has a relatively thin plate shape, and an insertion hole 71 through which the pipe 60 is inserted is provided at the center thereof. Furthermore, a plurality (four in the third embodiment) of mounting pieces 75 protruding outward are equally disposed in the circumferential direction on the outer peripheral edge of the member 70 to be joined. A fastener insertion hole 74 is provided at the tip of the attachment piece 75.

  A short cylindrical seat 73 is integrally formed on the peripheral edge of the insertion hole 71 of the member 70 so as to surround the insertion hole 71 so as to protrude to one side in the axial direction of the pipe 60. The seat 73 is formed by pressing and bending the peripheral edge of the insertion hole 71 of the member to be joined 70 into a short cylindrical shape so as to protrude to one side in the axial direction of the pipe 60 over the entire circumference thereof. It is formed. That is, the seat 73 is bent from the peripheral edge of the insertion hole 71 of the joined member 70 and is formed along the entire periphery of the peripheral edge of the insertion hole 71. An inner peripheral surface 72 of the insertion hole 71 of the member to be joined 70 is an inner peripheral surface of the seat portion 73. The to-be-joined member 70 and the thickness of the seat part 73 are 2-5 mm, for example. The protruding length of the seat portion 73 (that is, the length along the axial direction of the pipe 60) is, for example, 5 to 20 mm.

  In the joined structure 80 of the third embodiment, as shown in FIG. 19, the pipe 60 is inserted into the insertion hole 71 of the joined member 70, and the seat portion 73 of the joined member 70 is formed on the outer peripheral surface 61 a of the pipe 60. In a superposed state, the member 70 to be joined is expanded and joined to the pipe 60 and is friction-welded. The pipe expansion joining and the friction welding are simultaneously performed by expanding the pipe 60.

  As shown to FIG. 21A, in the joining apparatus 50 of 3rd Embodiment, the division | segmentation number of the die | dye 10 and the support part (not shown) of the pipe expansion joining tool 51 is eight. Both the cross-sectional shape of the wedge hole portion 14 of the die 10 and the cross-sectional shape of the wedge portion 31 of the mandrel 30 are regular octagonal shapes.

  Further, the joining device 50 includes a regulating member 39. As shown in FIG. 20, the regulating member 39 is disposed outside the seat portion 73 of the joined member 70 and regulates the amount of bulging of the joined member 70 to the outside of the seat portion 73 during tube expansion processing. is there. The shape of the regulating member 39 is an annular shape, and the regulating member 39 is further divided into two in the circumferential direction.

  In the joining method of the pipe 60 and the to-be-joined member 70 using the joining apparatus 50 of 3rd Embodiment, as shown to FIG. 21A and 21B, before expanding the pipe 60, the seat part 73 of the to-be-joined member 70 is shown. The restricting member 39 is arranged on the outside of the seat portion 73 so as to surround the entire circumference of the seat portion 73 with a slight gap from the seat portion 73. This gap is, for example, 1 to 5 mm. The restricting member 39 is fixed so as not to rotate in the same manner as the joined member 70. Next, the die 10 and the mandrel 30 are rotated. Then, the wedge portion 31 of the mandrel 30 is inserted into the wedge hole portion 14 of the die 10. Thereby, each die segment 11 of the die 10 is moved in the radial outward direction of the pipe 60. When the die segment 11 comes into contact with the inner peripheral surface 61 b of the pipe 60, the pipe 60 is driven and rotated according to the rotation operation of the die 10. In this way, the pipe 60 is expanded by the pipe expansion joining tool 51 while rotating the pipe 60 with respect to the member 70 to be joined. As a result, as shown in FIGS. 22A and 22B, the welded member 70 is expanded and joined to the pipe 60 at the same time as the friction welding. During the pipe expansion process, the seat portion 73 of the member to be joined 70 tends to bulge outward, but the seat portion 73 collides with the restricting member 39 on the way, thereby bulging the seat portion 73 outward. The amount is regulated. As a result, the seat 73 is reliably deformed within the elastic deformation region, that is, the plastic deformation of the seat 73 is reliably prevented. Thereby, the joining strength of the pipe 60 and the to-be-joined member 70 can be raised reliably. The regulating member 39 is removed from the member to be joined 70 after the tube expansion process.

  In the third embodiment, since the cylindrical seat 73 is formed at the peripheral edge of the insertion hole 71 of the member to be bonded 70, the member 70 to be inserted without increasing the thickness of the member 70 to be bonded. A large contact area between the inner peripheral surface 72 of the hole 71 and the outer peripheral surface 61a of the pipe 60 can be ensured. Therefore, the joining structure 80 can be reduced in weight, and the joining strength between the pipe 60 and the member 70 can be increased.

  In the third embodiment, the pipe 60 is driven and rotated according to the rotation operation of the pipe expansion joining tool 51 (that is, the die 10 and the mandrel 30) at the time of pipe expansion joining, but in the present invention, in addition, the pipe 60 is directly rotated. The member 70 may be driven to rotate as in the first modification (see FIGS. 12 and 13), or as in the second modification (see FIGS. 14 and 15). The pipe 60 and the joined member 70 may be driven to rotate in opposite directions.

<Fourth embodiment>
23A to 26 are diagrams illustrating a fourth embodiment of the present invention. In these drawings, the same reference numerals are assigned to the same elements as those in the first embodiment. The fourth embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIGS. 23A and 23B, the member to be joined 70 has a relatively thin plate shape, and an insertion hole 71 through which the pipe 60 is inserted is provided at the center thereof. As shown in FIG. 24, the joined member 70 functions as a flange connected to another plate-like member 91 by a bolt 92a and a nut 92b. The member 70 to be joined is pipe-bonded and friction-welded to the end of the pipe 60. And the to-be-joined member 70 makes the surface which faced the end surface 60a side of the pipe 60 among the surfaces of the thickness direction both sides into the connection surface 70a connected with the other member 91. As shown in FIG.

  At the periphery of the insertion hole 71 of the member 70 to be joined, a short cylindrical seat 73 surrounds the insertion hole 71 via a short conical cylindrical intermediate part 76 and is opposite to the connection surface 70a. Are integrally formed. The seat portion 73 and the intermediate portion 76 are press-bended so as to project the peripheral edge portion of the insertion hole 71 of the member 70 to be joined to one side in the axial direction of the pipe 60 over the entire circumference thereof. It is formed. In the region from the axially intermediate portion of the insertion hole 71 on the inner peripheral surface 72 of the insertion hole 71 of the member to be joined 70 to the position of the connecting surface 70a of the member to be joined 70, the intermediate portion 76 is present, so that the engagement concave portion is present. A point 77 is formed over the entire circumference of the insertion hole 71.

  In the joint structure 80 of the fourth embodiment, as shown in FIG. 24, the end portion of the pipe 60 is inserted into the insertion hole 71 of the member to be joined 70, and the end surface 60 a of the pipe 60 is from the intermediate portion in the axial direction of the insertion hole 71. While being inserted so as to be arranged in a range up to the position of the connecting surface 70 a of the member to be joined 70, the seat portion 73 of the member 70 to be joined is superposed on the outer peripheral surface 61 a of the pipe 60. In this state, the joined member 70 is expanded and joined to the end portion of the pipe 60 and is friction-welded. The pipe expansion joining and the friction welding are simultaneously performed by expanding the pipe 60.

  In this joint structure 80, a bulging portion S is formed over the entire circumference in the circumferential direction of the pipe end surface side vicinity portion 64 of the insertion portion 63 into the insertion hole 71 of the pipe 60. The bulging portion S is engaged with the engagement recess 77 in the direction X1 in which the end portion of the pipe 60 is extracted from the insertion hole 71, and thereby the insertion hole at the end portion of the pipe 60. Extraction from inside 71 is prevented. Further, a bulging portion S is also formed over the entire circumference in the vicinity portion 64 of the insertion portion 63 of the pipe 60 on the side opposite to the pipe end surface. The bulging portion S is engaged with the leading edge portion of the seat portion 73 in the direction X <b> 2 in which the end portion of the pipe 60 is inserted into the insertion hole 71. Thereby, the seat part 73 of the member to be joined 70 is joined to the pipe 60 in a state of being sandwiched between the two bulging parts S and S in the axial direction of the pipe 60. Therefore, the detachment strength of the joined member 70 with respect to the pipe 60 is enhanced by the bulging portions S and S.

  As shown in FIG. 25, the joining device 50 according to the fourth embodiment includes a regulating member 39. The regulating member 39 is disposed outside the seat portion 73 of the joined member 70 and regulates the amount of swelling of the joined member 70 to the outside of the seat portion 73 during tube expansion processing. The shape of the regulating member 39 is an annular shape, and the regulating member 39 is further divided into two in the circumferential direction.

  In the joining method of the pipe 60 and the to-be-joined member 70 using the joining apparatus 50 of 4th Embodiment, as shown in FIG. The regulating member 39 is arranged with a slight gap with respect to the seat portion 73 so as to surround the entire circumference of the seat portion 73. This gap is, for example, 1 to 5 mm. The restricting member 39 is fixed so as not to rotate in the same manner as the joined member 70. Next, the die 10 and the mandrel 30 are rotated. Then, the wedge portion 31 of the mandrel 30 is inserted into the wedge hole portion 14 of the die 10. Thereby, each die segment 11 of the die 10 is moved in the radial outward direction of the pipe 60. When the die segment 11 comes into contact with the inner peripheral surface 61 b of the pipe 60, the pipe 60 is driven and rotated according to the rotation operation of the die 10. In this way, while rotating the pipe 60 with respect to the member to be joined 70, the outer peripheral surface 61 a of the pipe 60 is in pressure contact with the inner peripheral surface 72 of the insertion hole 71 of the member to be joined 70 and the insertion portion 63 of the pipe 60. The pipe 60 is expanded by the pipe expansion joining tool 51 so that the pipe end face side vicinity portion 64 is engaged with the engagement recess 77. As a result, as shown in FIG. 26, the welded member 70 is expanded and joined to the pipe 60 at the same time as the friction welding. During the pipe expansion process, the seat portion 73 of the member 70 to be joined tends to bulge outward, but the seat portion 73 abuts against the regulating member 39 in the middle, thereby the amount of bulge outward of the seat portion 73. Is regulated. As a result, the seat 73 is reliably deformed within the elastic deformation region, that is, the plastic deformation of the seat 73 is reliably prevented. Thereby, the joining strength of the pipe 60 and the to-be-joined member 70 can be raised reliably. The regulating member 39 is removed from the member to be joined 70 after the tube expansion process.

  The fourth embodiment has the same effects as the third embodiment. Furthermore, in the joined structure 80, the end surface 60a of the end portion of the pipe 60 is disposed in a range from the axially intermediate portion of the insertion hole 71 of the joined member 70 to the position of the connecting surface 70a of the joined member 70. When connecting the member 70 to be joined to the other member 91, the pipe end surface side portion of the insertion portion 63 of the pipe 60 does not interfere with the other member 91. Therefore, the member to be joined 70 can be well connected to the other member 91. Further, the bulging portion S formed in the pipe end face side vicinity portion 64 of the insertion portion 63 of the pipe 60 is engaged with the engagement recess 77 in the direction X1 in which the end portion of the pipe 60 is extracted from the insertion hole 71. Therefore, the end portion of the pipe 60 is prevented from being pulled out from the insertion hole 71, thereby increasing the pull-out strength of the joined member 70 with respect to the pipe 60.

  In the fourth embodiment, the pipe 60 is driven and rotated in accordance with the rotation operation of the pipe expansion joining tool 51 (that is, the die 10 and the mandrel 30) at the time of pipe expansion joining. However, in the present invention, the pipe 60 is directly rotated. The member 70 may be driven to rotate as in the first modification (see FIGS. 12 and 13), or as in the second modification (see FIGS. 14 and 15). The pipe 60 and the joined member 70 may be driven to rotate in opposite directions.

<Fifth Embodiment>
FIG. 27 is a diagram for explaining a fifth embodiment of the present invention. In this figure, the same reference numerals are assigned to the same elements as those in the first embodiment. The fifth embodiment will be described below with a focus on differences from the first embodiment.

  The pipe 60 has a partition wall portion 65 disposed in the hollow portion 62 so as to extend in the axial direction. The partition wall portion 65 divides the hollow portion 62 into a plurality of hollow partition chambers 62a. The cross-sectional shape of the partition wall portion 65 is I-shaped. The number of hollow compartments 62a is two. The partition wall 65 is integrally formed with the pipe 60.

  In the joining apparatus 50 of the fifth embodiment, the number of divisions of the die 10 and the support portion (not shown) of the pipe expanding joining tool 51 is the same as the number of the hollow compartments 62a of the pipe 60, that is, two. Further, the wedge portion 31 of the mandrel 30 is equally divided into a plurality of wedge segment 31a around the central axis. The number of divisions of the wedge portion 31 is the same as the number of hollow compartments 62a of the pipe 60, that is, two.

  In the joining method of the pipe 60 and the to-be-joined member 70 using the joining apparatus 50 of 5th Embodiment, the pipe expansion process of the pipe 60 is performed as follows.

  In each hollow compartment 62a of the pipe 60, the die segment 11 of the die 10 and the wedge segment 31a of the mandrel 30 are disposed. Subsequently, the partition wall portion 65 is sandwiched between the wedge portion segments 31a and 31a arranged in the two hollow compartments 62a and 62a adjacent to each other via the partition wall portion 65 of the pipe 60. Next, the die 10 and the mandrel 30 are rotated. Then, the pipe is driven and rotated in accordance with the rotation operation of the die 10 and the mandrel 30. Then, each wedge segment 31 a of the mandrel 30 is simultaneously inserted into the corresponding wedge hole segment 14 a of the die segment 11. Thereby, each die segment 11 of the die 10 is moved in the radial outward direction of the pipe 60. In this way, the pipe 60 is expanded by the pipe expansion joining tool 51 while rotating the pipe 60 with respect to the member 70 to be joined. As a result, the welded member 70 is expanded and joined to the pipe 60 at the same time as the friction welding.

  In the fifth embodiment, since the partition wall portion 65 having an I-shaped cross section is disposed in the hollow portion 62 of the pipe 60, the pipe 60 is reinforced by the partition wall portion 65. Therefore, the joining structure 80 having high rigidity can be manufactured.

<Sixth Embodiment>
FIG. 28 is a diagram for explaining a sixth embodiment of the present invention. In this figure, the same reference numerals are assigned to the same elements as those in the first embodiment. The sixth embodiment will be described below with a focus on differences from the first embodiment.

  In the sixth embodiment, the partition wall portion 65 is disposed in the hollow portion 62 of the pipe 60 in the same manner as in the fifth embodiment, but the cross-sectional shape of the partition wall portion 65 is not an I-shape but a cross shape. Is. The partition wall 65 divides the hollow portion 62 of the pipe 60 into four hollow compartments 62a.

  In the joining device 50 of the sixth embodiment, the number of divisions of the die 10 and the support portion (not shown) of the pipe expansion joining tool 51 is the same as the number of the hollow compartments 62a of the pipe 60, that is, four. Further, the wedge portion 31 of the mandrel 30 is equally divided into a plurality of wedge segment 31a around the central axis. The number of divisions of the wedge part 31 is the same as the number of hollow compartments 62a of the pipe 60, that is, four.

  The joining method of the pipe 60 and the to-be-joined member 70 using the joining apparatus 50 of 6th Embodiment is the same as the said 5th Embodiment.

  In the sixth embodiment, since the partition wall portion 65 having a cross-shaped cross section is disposed in the hollow portion 62 of the pipe 60, the pipe 60 is reinforced very strongly by the partition wall portion 65. Therefore, it is possible to manufacture the joint structure 80 having very high rigidity.

  In the present invention, the cross-sectional shape of the partition wall portion 65 of the pipe 60 is not limited to an I shape or a cross shape, but may be a Y shape, a * shape, or the like. good.

<Seventh embodiment>
FIGS. 29-33 is a figure explaining 7th Embodiment of this invention. In these drawings, the same reference numerals are assigned to the same elements as those in the first embodiment. The seventh embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIGS. 29 and 30, in the joint structure 80 of the seventh embodiment, the pipe 60 is inserted into the insertion holes 71 of the plurality of members to be joined 70. In the seventh embodiment, the number of members to be joined 70 is three. These members to be joined 70 are spaced apart from each other in the axial direction of the pipe 60. In this state, the members to be joined 70 are expanded and joined to the pipe 60 and are friction-welded. The pipe expansion joining and the friction welding are simultaneously performed by expanding the pipe 60. The arrangement interval of each member to be joined 70 is, for example, 3 to 500 mm. In the present invention, this interval is not limited to the above range.

  As shown in FIGS. 31 and 32, in the joining device 50 of the seventh embodiment, the tube expansion joining tool 51 includes a die connection body 26 having a plurality of dies 10. The number of dies 10 is the same as the number of members 70 to be joined, that is, three. The number of divisions of the die 10 is eight. The dies 10 are arranged apart from each other in the axial direction corresponding to the arrangement interval of the bonded members 70. In two dies 10 and 10 adjacent to each other, each die segment 11 of one die 10 and each die segment 11 of the other die 10 are connected to each other via a rod-shaped die connecting rod 27. Further, among these dies 10, each die segment 11 of the die 10 arranged closest to the support portion 15 and each support portion segment 16 of the support portion 15 are connected to each other via a rod-like connecting rod 16b. Has been.

  The mandrel 30 has a plurality of (ie, three) wedge portions 31 corresponding to the wedge hole portions 14 of the dies 10. The wedge section 31 has a regular octagonal cross-sectional shape. The wedge portions 31 are arranged in the axial direction so as to correspond to the arrangement intervals of the dies 10. In the two adjacent wedge portions 31, 31, one wedge portion 31 and the other wedge portion 31 are connected to each other via a rod-shaped wedge portion connecting rod 28.

  Connected to the base end portion of the mandrel 30 is a mandrel driving unit 33 that moves the mandrel 30 in a direction in which each wedge portion 31 is inserted into the wedge hole portion 14 of each die 10. In the seventh embodiment, the mandrel driving unit 33 pulls the mandrel 30 to move each wedge portion 31 in the insertion direction with respect to the wedge hole portion 14.

  In the joining method of the pipe 60 and the to-be-joined member 70 using the joining apparatus 50 of 7th Embodiment, the pipe expansion process of the pipe 60 is performed as follows.

  As shown in FIG. 32, the pipe 60 is inserted into the insertion holes 71 of the plurality of members to be bonded 70 so that the plurality of members to be bonded 70 are spaced apart from each other in the axial direction of the pipe 60. Then, the pipe expansion joining tool 51 is inserted and disposed in the hollow portion 62 of the pipe 60 so that each die 10 is disposed at a position corresponding to each member 70 to be joined. Next, the die connection body 26 and the mandrel 30 are driven to rotate. Then, each wedge portion 31 of the mandrel 30 is inserted into the wedge hole portion 14 of each die 10 of the die connection body 26. Thereby, each die segment 11 of each die 10 is moved in the radial outward direction of the pipe 60. When the die segment 11 comes into contact with the inner peripheral surface 61 b of the pipe 60, the pipe 60 is driven and rotated according to the rotation operation of the die 10. As described above, the pipes 60 are rotated with respect to the members to be joined 70, and the insertion portions 63 of the pipes 60 are arranged so that the outer peripheral surfaces 61 a of the pipes 60 are in pressure contact with the inner peripheral surfaces 72 of the insertion holes 71 of the members to be joined 70. And the axially both sides vicinity portions 64 and 64 are collectively expanded by the tube expansion joining tool 51. As a result, as shown in FIG. 33, a plurality of members 70 to be joined are pipe-expanded to the pipe 60 and simultaneously friction welded. In the pipe expansion process, when the wedge portions 31 of the mandrel 30 are inserted into the wedge hole portions 14 of the dies 10, the mandrel 30 is pulled by operating the mandrel driving portion 33, whereby each wedge portion 31 is pulled. Is inserted into each wedge hole portion 14.

  In the seventh embodiment, since the plurality of members to be joined 70 are collectively pipe-bonded to the pipe 60 and simultaneously friction welded, the pipe 60 and the plurality of members 70 are efficiently joined. Can do.

  In the present invention, as shown in FIG. 34, each wedge portion 31 of the mandrel 30 may be disposed in the opposite direction to the seventh embodiment. In this case, the mandrel driving part 33 moves each wedge part 31 in the insertion direction with respect to each wedge hole part 14 by pressing the mandrel 30. Then, each wedge 31 of the mandrel 30 is inserted into each wedge hole 14 by pressing the mandrel 30 by operating the mandrel drive 33.

  In the seventh embodiment, the pipe 60 is driven and rotated in accordance with the rotation operation of the pipe expansion joining tool 51 (that is, the die 10 and the mandrel 30) at the time of pipe expansion joining. However, in the present invention, the pipe 60 is directly rotated. The plurality of members to be joined 70 may be driven to rotate as in the first modification (see FIGS. 12 and 13), or the second modification (see FIGS. 14 and 15). As described above, the pipe 60 and the plurality of members to be joined 70 may be rotationally driven in directions opposite to each other.

<Eighth Embodiment>
35 and 36 are views for explaining an eighth embodiment of the present invention. In these drawings, the same reference numerals are assigned to the same elements as those in the first embodiment. The eighth embodiment will be described below with a focus on differences from the first embodiment.

  As shown in FIG. 35, the joint structure 80 of the eighth embodiment is a steering support beam that is installed between the front pillars of a vehicle body (eg, an automobile). The pipe 60 is a support beam body. 70A is a first member to be joined. 70 A of this 1st to-be-joined members reinforce the pipe 60, The shape is a pipe shape, The hollow part is used as the penetration hole 71. As shown in FIG. 70B and 70B are two 2nd to-be-joined members. Of the two second members 70B, 70B, the second member 70B disposed at the right end of the pipe is a mounting side bracket, and the other second member 70B is a column mounting bracket. .

  In this joined structure 80, as shown in FIG. 36, the right side portion of the pipe 60 is inserted into the insertion hole 71 of the first joined member 70A, and the first joined member 70A is the second joined member 70B. In a state of being inserted into the insertion hole 71B, the first member to be joined 70A is expanded and joined to the pipe 60 and is friction-welded, and further, both the second members to be joined to the pipe 60 via the first member to be joined 70A. 70B and 70B are expanded and joined. By inserting the right side portion of the pipe 60 into the insertion hole 71 of the first member to be joined 70A, the right side portion of the pipe 60 is formed as a so-called double pipe, whereby the right side portion of the pipe 60 is reinforced. ing.

  In the joining apparatus 50 according to the eighth embodiment, two sets of two pressing projections 12 and 12 are separated on the pressing surface of each die segment 11 of the die 10 so as to correspond to both the second members to be joined 70B and 70B. Is provided.

  In the joining method of the pipe 60 using the joining apparatus 50 of the eighth embodiment and these members to be joined 70A, 70B, 70B, the pipe 60 expansion process is performed as follows.

  As shown in FIG. 36, the pipe 60 is inserted into the insertion hole 71 of the first bonded member 70A, and the first bonded member 70A is inserted into the insertion hole 71B of each second bonded member 70B. 70 A of 1st to-be-joined members and both 2nd to-be-joined members 70B and 70B are being fixed so that rotation is impossible. And the pipe expansion joining tool 51 is arrange | positioned in the hollow part 62 of the pipe 60. FIG. Next, the die 10 and the mandrel 30 are rotated. Then, the wedge portion 31 of the mandrel 30 is inserted into the wedge hole portion 14 of the die 10. Thereby, each die segment 11 of the die 10 is moved in the radial outward direction of the pipe 60. When the die segment 11 comes into contact with the inner peripheral surface 61 b of the pipe 60, the pipe 60 is driven and rotated according to the rotation operation of the die 10. In this way, the pipe 60 is pressed against the inner peripheral surface 72 of the insertion hole 71 of the first bonded member 70A while rotating the pipe 60 with respect to the first bonded member 70A and the second bonded members 70B and 70B. As described above, the pipe expansion tool 51 simultaneously expands the insertion portion 63 of the pipe 60 into the insertion hole 71 and the axially adjacent portions 64B and 64B of the insertion portions of the pipe 60 into the insertion holes 71B. As a result, the first member to be joined 70A is expanded and joined to the pipe 60 at the same time as the friction welding, and at the same time, the second members to be joined 70B are joined to the pipe 60 via the first member 70A.

  In the eighth embodiment, since the right side portion of the pipe 60 is formed as a so-called double pipe, the right side portion of the pipe 60 is reinforced. As described above, by using the pipe-shaped member 70A as the member to be bonded, it is possible to easily reinforce only the portion of the pipe 60 where high strength is required.

  As mentioned above, although several embodiment of this invention was described, this invention is not limited to these embodiment, Of course, it can change variously within the range which does not deviate from the summary of this invention. It is.

  In the present invention, two or more of the technical ideas of the first to eighth embodiments may be combined.

  The present invention is used, for example, when manufacturing a steering support beam, a steering column holder, a muffler, a frame, a propeller shaft, a suspension arm, a camshaft, and other automobile parts of an automobile, or as a product other than an automobile, for example, The present invention can be used for a method of joining a pipe and a member to be joined, a joining device used for the joining method, and a joint structure of a pipe and a member to be used, which are used when manufacturing a piping material.

10: Die 11: Die segment 12: Pressing convex part 13: Pressing part 14: Wedge hole part 20: Piece part 21: Die segment body 23: Connection bolt (connection means)
26: Die coupling body 27: Die coupling rod 30: Mandrel 31: Wedge portion 39: Restricting member 40: Rotation drive unit 44: Control unit 50: Joining device 51: Tube expansion joining tool 60: Pipe 60a: End face 61a of pipe Outer peripheral surface 61b: Pipe inner peripheral surface 63: Pipe insertion portion 64: Pipe vicinity portion 70: Joined member 70a: Connection surface 71: Insertion hole 72: Inner peripheral surface 73 of the insertion hole: Seat 74: Fastener insertion hole 77: Engaging recess 80: Joining structure 91: Other member S: Swelling bulge

Claims (14)

  While the pipe is inserted into the insertion hole provided in the member to be joined, the outer peripheral surface of the pipe is inserted into the member to be joined while rotating the pipe relative to the member to be joined about the central axis of the pipe. The pipe is welded to the pipe and is subjected to friction welding at the same time as the member to be welded is expanded by pipe expansion processing with a pipe expansion joining tool arranged in the hollow portion so as to press-contact the inner peripheral surface of the hole. A joining method with a joining member.   The outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be joined, and the portions near both sides in the axial direction of the insertion portion into the insertion hole of the pipe are swelled outward in the radial direction of the pipe, respectively. The method of joining a pipe and a member to be joined according to claim 1, wherein the pipe is expanded. The member to be joined is fixed so as not to rotate around the central axis of the pipe,
The pipe is supported so that it can be driven and rotated around its central axis.
The pipe expansion joint tool that is driven to rotate around the center axis of the pipe is brought into contact with the inner peripheral surface of the pipe, so that the pipe is driven to rotate around the center axis of the pipe according to the rotation operation of the pipe expansion joint tool. 3. A method for joining a pipe and a member to be joined according to claim 1 or 2, wherein the pipe is subjected to pipe expansion processing. The pipe is fixed so that it cannot rotate around its central axis,
The method for joining a pipe and a member to be joined according to claim 1 or 2, wherein the pipe is expanded while rotating the member to be joined about the central axis of the pipe.   The method of joining a pipe and a member to be joined according to claim 1 or 2, wherein the pipe is expanded while rotating the pipe and the member to be joined in directions opposite to each other about the central axis of the pipe.   Under the state where the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be bonded, the rotation is controlled and stopped so that the circumferential position of the predetermined portion of the member to be bonded with respect to the pipe becomes a predetermined position. Item 6. A method of joining the pipe according to any one of Items 1 to 5 to the member to be joined. A cylindrical seat protrudes from one side in the axial direction of the pipe and is formed integrally with the periphery of the insertion hole of the member to be joined.
The pipe is inserted into the member to be joined in a state where the pipe is inserted into the insertion hole of the member to be joined and the amount of bulging to the outside of the seat part is regulated by the regulating member disposed outside the seat part of the member to be joined. The method for joining a pipe and a member to be joined according to any one of claims 1 to 6, wherein the pipe is expanded while relatively rotating about the central axis of the pipe. The member to be joined is one of the surfaces on both sides in the thickness direction, which is a connection surface connected to another member,
A cylindrical seat portion is formed integrally with the peripheral edge portion of the insertion hole of the member to be joined, protruding to the side opposite to the connecting surface,
An engagement recess is formed in a region from the axially intermediate portion of the insertion hole to the connection surface on the inner peripheral surface of the insertion hole of the member to be joined,
The pipe is connected to the member to be joined in a state where the end of the pipe is inserted into the insertion hole of the member to be joined so that the end surface of the pipe is disposed in the range from the axial intermediate portion of the insertion hole to the connecting surface of the member to be joined. The outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be joined, while rotating about the central axis of the pipe relative to the pipe. The method for joining a pipe and a member to be joined according to any one of claims 1 to 7, wherein the pipe is expanded so that a portion near the pipe end face side is engaged with the engagement recess. The tube expansion joining tool includes a die having a wedge hole portion and divided into a plurality of die segments around the wedge hole portion, and a die having a wedge portion and the wedge portion inserted into the wedge hole portion of the die. A mandrel that moves each of the die segments outwardly of the radius of the pipe,
The die segment has a piece part having one pressing convex part among two pressing convex parts that press the vicinity of both sides in the axial direction of the insertion part into the pipe insertion hole, and a mandrel with the other pressing convex part. The pipe according to any one of claims 1 to 8, further comprising: a die segment main body that abuts on an outer peripheral surface of the wedge portion; and a connecting means that detachably connects the piece portion and the die segment main body. Joining method with member. A plurality of dies having a wedge hole portion and divided into a plurality of die segments in the circumferential direction around the wedge hole portion are spaced apart from each other in the axial direction and are adjacent to each other. A die connected body in which each die segment of one die and each die segment of the other die are connected to each other via a die connecting rod,
A mandrel having a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body, wherein the plurality of wedge portions are formed apart from each other in the axial direction;
Prepare a pipe expansion joining tool with
The pipe is inserted into the plurality of members to be joined in a state where the plurality of members to be joined are spaced apart from each other in the axial direction of the pipe through insertion holes provided in the members to be joined, respectively. With the pipe expansion joining tool arranged in the hollow portion so that the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of each member to be joined while rotating about the central axis of the pipe relative to the A method of joining a pipe and a plurality of members to be joined, wherein the plurality of members to be joined are pipe-expanded and joined together at the same time by friction expanding by pipe expansion. The pipe is expanded in such a manner that the pipe is placed in the hollow portion of the pipe inserted into the insertion hole provided in the member to be joined and the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be joined. With the pipe expansion joining tool for expanding and joining the member to be joined to the pipe,
When pipe expansion processing is performed with the pipe expansion joining tool, at least one of the pipe, the pipe expansion joining tool, and the member to be joined is arranged so that the pipe rotates about the central axis of the pipe relative to the member to be joined. A rotation drive unit for rotation;
An apparatus for joining a pipe and a member to be joined.   The rotation drive unit rotates so that the circumferential position of a predetermined portion of the member to be joined with respect to the pipe becomes a predetermined position in a state where the outer peripheral surface of the pipe is in pressure contact with the inner peripheral surface of the insertion hole of the member to be joined. The joining apparatus of the pipe and to-be-joined member of Claim 11 provided with the control part which carries out control stop of. The plurality of members to be joined are disposed in the hollow portions of the pipes inserted so as to be separated from each other in the axial direction of the pipe in the insertion holes provided in the plurality of members to be joined, and the outer peripheral surface of the pipe A pipe expanding tool for expanding and joining a plurality of members to be joined together to the pipe by expanding the pipe so that the pipe is in pressure contact with the inner peripheral surface of the insertion hole of each member to be joined;
When the pipe is expanded by the pipe expansion joining tool, the pipe, the pipe expansion joining tool, and the plurality of pieces to be welded are arranged so that the pipe rotates about the central axis of the pipe relative to the plurality of members to be joined. A rotation drive unit that rotates at least one of the joining members;
With
Tube expansion joint tool
A die having a wedge hole portion and divided into a plurality of die segments in the circumferential direction around the wedge hole portion is arranged apart from each other in the axial direction, and one of the two dies adjacent to each other. A die connected body in which each die segment of the die and each die segment of the other die are connected to each other via a connecting rod;
A mandrel having a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body, wherein the plurality of wedge portions are formed apart from each other in the axial direction;
An apparatus for joining a pipe and a plurality of members to be joined.   A joined structure of a pipe and a member to be joined, wherein the member to be joined is expanded and joined to the pipe and friction welded in a state where the pipe is inserted into an insertion hole provided in the member to be joined. .

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