JP4995665B2 - Method of joining a pipe and a plurality of members to be joined - Google Patents

Description

  The present invention relates to a joining method and joining apparatus for joining a plurality of members to be joined to a pipe.

  Conventionally, as a method of joining a member to be joined such as a flange to a pipe, for example, there is the following method.

The pipe is inserted into an insertion hole provided in the member to be joined, and an expanding die is disposed in the hollow portion of the pipe. This die is provided with a wedge hole portion penetrating in the axial direction in the center portion and divided into a plurality of die segments in the circumferential direction around the wedge hole portion. Next, each die segment of the die is moved outward in the radial direction of the pipe by inserting the wedge portion of the expanding mandrel into the wedge hole portion of the die. As a result, the pipe is expanded (that is, expanded), and the member to be joined is joined to the pipe. This joining method is also called a ridge lock processing method (see, for example, Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 11-36859 JP 11-47855 A

  Thus, when a plurality of members to be joined are joined to the pipe by the joining method described above, conventionally, the members to be joined are joined to the pipe one by one. Therefore, work efficiency was bad.

  Therefore, in order to improve the work efficiency, the inventor uses a die (103) in which a plurality of expanding processing pressing portions are integrally formed as shown in FIG. The method of joining the to-be-joined member (145) collectively was considered. In FIG. 11, the pipe (140) has a circular cross section, the member to be joined (145) has an annular plate shape, and the number of members to be joined (145) is three. Further, (105) is a wedge hole provided in the die (103), and (104) is a die segment.

  However, in this case, since the maximum diameter of the wedge portion (121) of the mandrel (120) is limited to be equal to or less than the inner diameter of the pipe (140), the taper angle θ of the wedge portion (121) of the mandrel (120) (ie, If the taper angle θ of the wedge hole portion (105) of the die (103) is set too large, as shown in the figure, all the members (145) to be joined cannot be joined together. there were. On the other hand, if the taper angle θ of the wedge portion (121) of the mandrel (120) is set to be small in order to eliminate this difficulty, the stroke amount of the mandrel (120) at the time of expanding increases, so a large processing space is required. Become.

  The present invention has been made in view of the above-described technical background, and an object thereof is to provide a joining method capable of joining a plurality of members to be joined to a pipe with high work efficiency and a joining apparatus used in the joining method. There is to do.

  The present invention provides the following means.

[1] A wedge hole portion is provided in the center portion so as to penetrate in the axial direction, and a plurality of dies divided into a plurality of die segments in the circumferential direction around the wedge hole portion are separated from each other in the axial direction. An expanding 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 connecting rods in two adjacent dies,
An expanding mandrel in which a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body are formed apart from each other in the axial direction;
Using a joining device with
With the pipe inserted into the insertion holes provided in each of the plurality of members to be joined, each wedge portion of the mandrel is inserted into the wedge hole portion of the corresponding die of the die connection body disposed in the hollow portion of the pipe. Thus, each die segment of each die of the die connected body is moved outward in the radial direction of the pipe, and thereby, each expansion processing object consisting of the insertion portion into each insertion hole of the pipe and the portions near both sides in the axial direction thereof. A method for joining a pipe and a plurality of members to be joined, wherein at least a part of the portion is expanded, and a plurality of members to be joined are joined to the pipe.

  [2] The joining method according to item 1, wherein the die segment and the connecting rod are connected to each other so as to be separable from each other.

  [3] The joining method according to item 1 or 2, wherein the die segment and the connecting rod are connected to each other via a rotary joint.

  [4] The joining method according to any one of the preceding items 1 to 3, wherein the taper angles of the wedge hole portions of at least two dies among the plurality of dies of the die connection body are different from each other.

  [5] The joining method according to any one of items 1 to 4, wherein the diameters of at least two of the plurality of dies in the die-connected body are different from each other.

  [6] The joining method according to any one of the preceding items 1 to 5, wherein each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die coupling body by pulling the mandrel.

  [7] The joining method according to any one of the preceding items 1 to 6, wherein each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body by pressing the mandrel.

[8] Each expansion processing target part including an insertion part into each insertion hole of the pipe and a part in the vicinity of both sides in the axial direction in a state where the pipe is inserted into the insertion hole provided in each of the plurality of members to be joined. A joining device of a pipe and a plurality of members to be joined, wherein a plurality of members to be joined are joined to the pipe by expanding at least a part of
A plurality of dies that are provided in the center with a wedge hole penetrating in the axial direction and divided into a plurality of die segments in the circumferential direction around the wedge hole are arranged apart from each other in the axial direction. In addition, in two adjacent dies, each die segment of one die and each die segment of the other die are connected to each other via a connecting rod, respectively,
An expanding mandrel in which a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body are formed apart from each other in the axial direction;
With
Each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body disposed in the hollow portion of the pipe, so that each die segment of the corresponding die of the die connection body is directed radially outward of the pipe. Is to be moved to
Each die segment of each die of the die connected body is expanded outwardly in the radial direction of the pipe by each wedge portion of the mandrel, so that at least a part of each expanding target portion of the pipe is expanded. An apparatus for joining a pipe and a plurality of members to be joined.

  [9] The joining device according to item 8, wherein the die segment and the connecting rod are connected to each other so as to be separable from each other.

  [10] The joining device according to item 8 or 9, wherein the die segment and the connecting rod are connected to each other via a rotary joint.

  [11] The joining apparatus according to any one of the aforementioned items 8 to 10, wherein the taper angles of the wedge hole portions of at least two dies among the plurality of dies of the die connection body are different from each other.

  [12] The joining device according to any one of 8 to 11 above, wherein the diameters of at least two dies of the plurality of dies of the die connection body are different from each other.

  [13] The joining device according to any one of items 8 to 12, further comprising traction drive means for pulling the mandrel in a direction in which each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body.

  [14] The joining apparatus according to any one of the above items 8 to 13, further comprising a pressing drive unit that presses the mandrel in a direction in which each wedge part of the mandrel is inserted into a corresponding wedge hole part of the die connection body.

  The present invention has the following effects.

  In the invention of [1], in the state in which the pipe is inserted into the insertion holes provided in the plurality of members to be joined, each wedge part of the mandrel corresponds to the die connection body arranged in the hollow part of the pipe. By inserting into the wedge hole of the die, each die segment of each die of the die connected body is moved outward in the radial direction of the pipe, so that the insertion portion into each insertion hole of the pipe and the vicinity of both sides in the axial direction Since at least a part of each part to be expanded consisting of portions is expanded and a plurality of members to be joined are collectively joined to the pipe, the plurality of members to be joined can be joined to the pipe with high work efficiency.

  In the invention of [2], the die segment and the connecting rod are connected so as to be separable from each other. Therefore, if the interval between the dies of the die connected body is changed, the connecting rod is separated from the die segment, and instead of this, the connecting rod having an appropriate length is connected to the die segment. The distance between the dies can be easily changed.

  In the invention of [3], the die segment and the connecting rod are connected to each other through a rotary joint. Therefore, even if the expansion processing amounts (expansion amounts) of the plurality of expansion processing target portions of the pipe are different from each other, the expansion processing of each expansion processing target portion can be reliably performed.

  In the invention of [4], the taper angles of the wedge hole portions of at least two dies among the plurality of die wedge holes of the die connection body are different from each other. Therefore, it is possible to perform the expansion processing of at least two expansion processing target portions of the plurality of expansion processing target portions of the pipe so that the expansion processing amount (expansion amount) is different from each other.

  In the invention of [5], the diameters of at least two dies out of the plurality of dies of the die connected body are different from each other. Therefore, even if the inner diameters of at least two of the plurality of expansion processing target portions of the pipe are different from each other, the expansion processing of the two expansion processing target portions of the pipe is performed. It can be done reliably.

  In the invention of [6], by pulling the mandrel, each wedge part of the mandrel is inserted into the wedge hole part of the corresponding die of the die connecting body, so that buckling of the mandrel can be prevented.

  In the invention of [7], by pressing the mandrel, each wedge part of the mandrel is inserted into the wedge hole part of the corresponding die of the die connecting body, and therefore, the tensile break between the wedge parts of the mandrel can be prevented.

  In the inventions [8] to [14], it is possible to provide a joining device that is preferably used in the inventions [1] to [7].

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

<First Embodiment>
1-5 is a figure for demonstrating the joining apparatus and the joining method which concern on 1st Embodiment of this invention.

  In FIG. 1 and FIG. 2, (50) is a joined structure manufactured by joining a plurality of members (45) to the pipe (40) by the joining device (1) of the first embodiment. In the first embodiment, the number of members to be joined (45) is three.

  The pipe (40) 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 used for a piping material or the like. . However, in this invention, a pipe (40) is not limited to what is used for these uses.

  This pipe (40) is straight and its cross-sectional shape is circular. The pipe (40) has a hollow section (43) having a circular cross section extending in the axial direction (that is, in the length direction). Further, the inner diameter and the wall thickness of the pipe (40) are set constant in the axial direction of the pipe (40).

  The pipe (40) is made of a material that can be elastically deformed and plastically deformed. For example, the pipe (40) is made of metal, and more specifically, made of aluminum or an aluminum alloy. However, in the present invention, the material of the pipe (40) is not limited to aluminum or an aluminum alloy, and may be other metals such as iron, steel, copper, or plastic. May be. The pipe (40) may be made of an extruded material or a drawn material, or may be manufactured by other methods.

  The member to be joined (45) is used as, for example, a flange attached to another member (not shown). Further, the member to be joined (45) is a plate-like one, and more specifically, an annular plate-like one. Fastener insertion holes (not shown) such as bolt insertion holes and joining pieces (not shown) are provided on the peripheral edge of the member to be joined (45). However, in the present invention, the member to be joined (45) is not limited to be used as a flange, but may have a bracket or a stay in addition, or for other purposes. It may be used.

  The member to be joined (45) is made of an elastically deformable material, and is made of, for example, metal, and more specifically, made of aluminum or an aluminum alloy. However, in the present invention, the material of the member to be joined (45) is not limited to aluminum or an aluminum alloy. In addition, for example, a metal such as iron, steel, or copper may be used. It may be. The member to be joined (45) may be made of an extruded material, a drawn material or a rolled material, may be made of a die-cast material, or is manufactured by other methods. May be.

  An insertion hole (46) through which the pipe (40) is inserted is provided at the center of the member to be joined (45). The cross-sectional shape of the insertion hole (46) is a shape corresponding to the cross-sectional shape of the pipe (40), that is, a circular shape.

  The length of the pipe (40) is, for example, 50 to 2000 mm. The inner diameter of the pipe (40) is, for example, 20 to 100 mm. The thickness of the pipe (40) is, for example, 0.5 to 5 mm.

  The thickness of the member to be joined (45) is, for example, 5 to 50 mm. The diameter of the member to be joined (45) is, for example, 30 to 300 mm. The diameter of the insertion hole (46) of the member to be joined (45) is set to be, for example, 0.1 to 1 mm larger than the outer diameter of the pipe (40) in a state before the expanding process.

  However, in this invention, each dimension of a pipe (40) and a to-be-joined member (45) is not limited to it being said range, According to the intended purpose and use of a joining structure (50), it is various. Is set.

  As shown in FIG.1 and FIG.2, in this joining structure (50), the pipe (40) is separated from each other in the axial direction of the pipe (40). 45) are inserted into the insertion holes (46), (46) and (46) of (45). And in this state, at least each of the expansion processing target parts (41) consisting of the insertion parts (41a) into the respective insertion holes (46) of the pipe (40) and the axially both sides vicinity parts (41b) (41b). By partly expanding at the same time, three members to be joined (45), (45), and (45) are collectively joined to the pipe (40). In the first embodiment, the entire expansion processing target portion (41) of the pipe (40) is expanded.

  However, the present invention is not limited to the fact that each of the expansion processing target portions (41) of the pipe (40) is subjected to the expansion processing. In addition, each expansion processing target portion of the pipe (40) ( Only part of 41) may be expanded. That is, in the present invention, for example, only the insertion portion (41a) of the insertion portion (41a) into each insertion hole (46) of the pipe (40) and the axially both sides vicinity portions (41b) (41b) is expanded. It is also possible that only the axially opposite side portions (41b) and (41b) are expanded, or the insertion portion (41a) and its axially one side nearby portion (41b) are expanded. May be.

  In the joined structure (50) obtained in this way, two expanded portions (41b) (41b) are provided in the vicinity (41b) (41b) of both sides in the axial direction of the insertion portion (41a) into the insertion hole (46) of the pipe (40). The bulging portions (42) and (42) are locally formed in an outward bulging shape. And the to-be-joined member (45) is joined to the pipe (40) in the state where the to-be-joined member (45) is sandwiched between both the expanded pipe portions (42) and (42). The cross-sectional shape of the expanded pipe portion (42) is an arc shape.

  The pipe expansion amount (that is, the expansion processing amount) of the pipe expansion portion (42) is, for example, 0.5 to 10 mm. Moreover, the width | variety of a pipe expansion part (42) is 3-30 mm, for example. However, in the present invention, the pipe expansion amount and the width of the pipe expansion portion (42) are not limited to the above ranges, respectively.

  Further, in these members to be joined (45), (45) and (45), the interval between the two members to be joined (45) and (45) adjacent to each other is, for example, 3 to 500 mm. However, in this invention, this space | interval is not limited to said range, It sets variously according to the intended purpose and use of a joining structure (50).

  Next, the joining apparatus (1) of the first embodiment will be described below.

  As shown in FIGS. 3 to 5, the joining device (1) is for joining three members (45), (45), and (45) to be joined to the pipe (40) at once.

  The joining device (1) includes an expanding die connection body (2), an expanding mandrel (20), and the like.

  The die connection body (2) is provided with a plurality of expanding dies (3) that are spaced apart from each other in the axial direction. In the first embodiment, the number of dies (3) is three.

  Further, the three dies (3), (3), and (3) are arranged so as to be spaced apart from each other in accordance with the interval between the members to be joined (45).

  The die (3) is substantially cylindrical and has a higher strength than the pipe (40), and is made of, for example, tool steel or cemented carbide. In addition, a wedge hole portion (5) is provided in the center portion of the die (3) so as to penetrate in the axial direction. The wedge hole portion (5) has a truncated cone shape or a polygonal truncated pyramid shape. In the first embodiment, the wedge hole portion has a polygonal truncated cone shape, and more specifically, a regular octagonal truncated cone shape. Therefore, the cross-sectional shape of the wedge hole (5) is a regular octagon.

  Also, the diameters D of the three dies (3), (3), and (3) are all set equal to each other.

  In the first embodiment, the taper angles θ of the wedge holes (5), (5), and (5) of the three dies (3), (3), and (3) are set to be equal to each other. Furthermore, the taper angle θ of the wedge hole portion (5) and the taper angle θ of the wedge portion (21) of the mandrel (20) described later are set to be equal to each other. Specifically, the taper angle θ of the wedge hole portion (5) (that is, the taper angle θ of the wedge portion (21)) is set to 1 to 30 °, for example. However, in the present invention, the taper angle θ of the wedge hole portion (5) (that is, the taper angle θ of the wedge portion (21)) is not limited to the above range.

  Furthermore, the die (3) is equally divided into a plurality of die segments (4) in the circumferential direction around the wedge hole (5). In the first embodiment, the number of divisions of the die (3) is eight (see FIG. 3).

  Each die segment (4) of each die (3) is expanded outward in the radial direction of the pipe (40), so that at least a part of each expansion processing target portion (41) of the pipe (40) is expanded. (Expanding process).

  At both axial ends of the outer peripheral surface of each die segment (4), pressing convex portions (4a) (4a) each having an arcuate cross section are formed extending in the circumferential direction. As shown in FIG. 5, both pressing protrusions (4a) and (4a) are provided in the vicinity of both sides (41b) in the axial direction of the insertion portion (41a) into the insertion hole (46) of the pipe (40) during the expansion process. 41b) is pressed outward and plastically deformed, thereby forming the expanded portions (42) and (42) having a circular arc cross section in both the portions (41b) and (41b).

  The protruding height of the pressing protrusion (4a) is, for example, 0.5 to 10 mm. The width | variety of a press convex part (4a) is 2-20 mm, for example. However, in this invention, the protrusion height and width | variety of a press convex part (4a) are not limited to said range, respectively.

  An axially intermediate portion of the outer peripheral surface of each die segment (4), that is, a portion (4b) between the pressing convex portions (4a) and (4a) is inserted into the insertion hole (46) of the pipe (40) during the expansion process. The insertion portion (41a) is pressed outward, thereby expanding the portion (41a).

  Further, in two dies (3) (3) adjacent to each other among the three dies (3) (3) (3), each die segment (4) of one die (3) and the other die ( Each die segment (4) of 3) is connected to each other through a die segment connecting rod (6) so as to be separable from each other.

  The die segment connecting rod (6) is a rod having rigidity, and is made of, for example, tool steel or cemented carbide. Moreover, the cross-sectional shape of this connection rod (6) is circular shape, for example.

  One end of the connecting rod (6) is detachably connected to the die segment (4) of one die (3) in a fixed state by a screw (not shown) or the like. The other end is connected to the die segment (4) of the other die (3) in a fixed state by screws (not shown) or the like.

  A columnar or disk-shaped support portion (8) that supports the three dies (3), (3), and (3) is provided at the end portion of the die connection body (2). A through hole (10) having a circular cross section penetrating in the axial direction (thickness direction of the support portion (8)) is provided at the center of the support portion (8). Further, the support portion (8) is equally divided into a plurality of support portion segments (9) in the circumferential direction around the through hole (10). The number of divisions of the support part (8) is the same as the number of divisions of the die (3), that is, eight.

  Furthermore, each support part segment (9) of the support part (8) and each die segment (4) of the die (3) adjacent to the support part (8) each have a support part segment connecting rod (11). And are separably connected to each other.

  As shown in FIGS. 3 to 5, the mandrel (20) has a plurality of wedge portions (21) corresponding to the wedge hole portions (5) of the dies (3) of the die connection body (2) in the axial direction. Are spaced apart from each other. In the first embodiment, since the number of dies (3) is three, the number of wedge portions (21) is three. The wedge portion (21) is made of, for example, tool steel or cemented carbide.

  The three wedge portions (21), (21), and (21) correspond to the intervals between the wedge holes (5), (5), and (5) of the three dies (3), (3), and (3). They are spaced apart.

  Each wedge part (21) is formed in the shape corresponding to the wedge hole part (5) of die | dye (3), ie, is formed in the shape of a regular octagonal frustum.

  In the first embodiment, the taper angles θ of the three wedge portions (21) (21) (21) are set to be equal to each other. Furthermore, as described above, the taper angle θ of the wedge part (21) and the taper angle θ of the wedge hole part (5) of the die (3) are set to be equal to each other.

  Each wedge portion (21) is inserted into the wedge hole portion (5) of the die (3) corresponding to the die connection body (2), thereby each die (3) corresponding to the die connection body (2). The die segment (4) is moved radially outward of the pipe (40).

  In this mandrel (20), between the two wedge parts (21) (21) adjacent to each other, the wedge part connection rod (22) for connecting the wedge parts (21) (21) to each other in a separable manner. ) Is arranged. That is, both the wedge parts (21) (21) are connected to each other through the wedge part connecting rods (22) so as to be separable from each other.

  The wedge connecting rod (22) is a rod having rigidity, and is made of, for example, tool steel or cemented carbide. Moreover, the cross-sectional shape of this connection rod (22) is circular. The diameter of the connecting rod (22) is set equal to the diameter of the tapered end of the wedge portion (21).

  Then, one end of the connecting rod (22) is connected to one of the two wedge portions (21) and (21) adjacent to each other so as to be separable into a fixed state by a screw (not shown) or the like. The other end of the connecting rod (22) is connected to the other wedge (21) in a fixed state by a screw (not shown) or the like.

  Furthermore, the tip side portion (20a) of the mandrel (20) is inserted into the through hole (10) of the support portion (8) of the die connector (2) in a loosely inserted state. And this part (20a) is connected with the traction drive means (30). The traction drive means (30) includes a mandrel (20) in a direction in which each wedge portion (21) of the mandrel (20) is inserted into a wedge hole portion (5) of a corresponding die (3) of the die connection body (2). It is a tow. For example, a hydraulic cylinder is used as the traction drive means (30).

  Next, a method for joining three members to be joined (45), (45) and (45) to the pipe (40) using the joining device (1) of the first embodiment will be described below.

  As shown in FIG. 4, the pipe (40) is inserted into the insertion hole (46) (46) (46) of the three members to be joined (45) (45) (45) in the loosely inserted state. Further, the three dies (3), (3), and (3) of the die connection body (2) are inserted into the hollow portion (43) of the pipe (40) from the end opening of the pipe (40).

  In this state, the wedge part (21) of the mandrel (20) is pulled by pulling the mandrel (20) in the axial direction of the mandrel (20) from the tip side part (20a) by the pulling drive means (30). Are simultaneously forcibly inserted into the wedge hole portions (5) of the corresponding die (3) of the die connection body (2). As a result, as shown in FIG. 5, the die segments (4) of the dies (3) of the die connection body (2) are simultaneously moved radially outward of the pipe (40), so that the pipe (40) Each expanding process target part (41) is expanded simultaneously.

  By this expanding process, the expansion target part (41) of the pipe (40) is plastically deformed so as to locally bulge outward, and is pressed against the inner peripheral surface of the insertion hole (46) of the member to be joined (45). At the same time, the member to be joined (45) is elastically deformed so that the inner diameter of the insertion hole (46) of the member to be joined (45) extends radially outward. As the member to be joined (45) is elastically deformed in this way, an elastic restoring force is accumulated in the member to be joined (45).

  During this expanding process, the portions (41b) and (41b) near both sides in the axial direction of the insertion portion (41a) into the insertion hole (46) of the pipe (40) are 2 of the segment (4) of the die (3). Each of the pressing protrusions (4a) and (4a) is pressed outward to bulge in a cross-sectional arc shape.

  Subsequently, each wedge part (21) of the mandrel (20) is extracted from each wedge hole part (5). Then, each member to be joined (45) is pressed and fixed to the outer peripheral surface of the pipe (40) by the elastic restoring force (spring back force) accumulated in each member to be joined (45). Thereby, each to-be-joined member (45) is joined to a pipe (40). Next, the three dies (3), (3) and (3) of the die connection body (2) are extracted from the hollow portion (43) of the pipe (40).

  By the above procedure, the joined structure (50) shown in FIGS. 1 and 2 is obtained.

  Thus, the bonding method of the first embodiment has the following advantages.

  Each wedge part (21) of the mandrel (20) in a state where the pipe (40) is inserted into the insertion holes (46) (46) (46) of the three members to be joined (45) (45) (45). ) Is inserted into the wedge hole portion (5) of the corresponding die (3) of the die connection body (2) disposed in the hollow portion (43) of the pipe (40), thereby the die connection body (2). Each die segment (4) of each die (3) is simultaneously moved outward in the radial direction of the pipe (40), and thereby each expansion processing target part (41) of the pipe (40) is expanded simultaneously. Since the three members to be joined (45), (45), and (45) are collectively joined to the pipe (40), the three members to be joined (45), (45), and (45) are efficiently attached to the pipe (40). Can be joined.

  Further, by pulling the mandrel (20), each wedge part (21) of the mandrel (20) is inserted into the wedge hole part (5) of the corresponding die (3) of the die connection body (2). Buckling of the mandrel (20) can be prevented.

  Furthermore, when changing the space | interval between each die | dye (3) of a die | dye coupling body (2), it separates from the die segment (4), and replaces this with the appropriate length. The die segment connecting rod (6) is connected to the die segment (4). Thereby, the space | interval between each die | dye (3) can be changed easily.

  Further, when changing the interval between the wedge portions (21) of the mandrel (20), the wedge portion connecting rod (22) is separated from the wedge portion (21), and instead of an appropriate length. The wedge portion connecting rod (22) is connected to the wedge portion (21). Thereby, the space | interval between each wedge part (21) can be changed easily.

  Moreover, the joining apparatus (1) of this 1st Embodiment can be used suitably for the joining method of this 1st Embodiment.

Second Embodiment
FIG. 6 is a view for explaining a joining device and a joining method according to the second embodiment of the present invention. The joining apparatus (1) and joining method will be described below with a focus on differences from the first embodiment. This joining apparatus (1) is a traction drive means (FIG. 4) for pulling the mandrel (20) in a predetermined direction. Instead of reference 30), the mandrel (20) is inserted in the direction of inserting each wedge part (21) of the mandrel (20) into the wedge hole part (5) of the corresponding die (3) of the die connector (2). A pressing drive means (31) for pressing is provided. The pressing drive means (31) is connected to the proximal end portion (20b) of the mandrel (20). For example, a hydraulic cylinder is used as the pressing drive means (31).

  When joining the three members to be joined (45), (45), and (45) to the pipe (40) using the joining device (1), the mandrel (20) is attached to the base by the pressing drive means (31). By pressing in the axial direction of the mandrel (20) from the end part (20b), each wedge part (21) of the mandrel (20) is caused to be a wedge hole part of the corresponding die (3) of the die connection body (2). (5) Forcibly insert them simultaneously. Thereby, each die segment (4) of each die (3) of the die connected body (2) is simultaneously moved outward in the radial direction of the pipe (40), and each expansion processing target portion (41) of the pipe (40) is thus obtained. ) At the same time. As a result, the three members to be joined (45) (45) (45) are collectively joined to the pipe (40).

  According to the joining method of the second embodiment, it is possible to prevent the tensile break between the wedge portions (21) of the mandrel (20).

<Third Embodiment>
FIG. 7 is a view for explaining a joining device and a joining method according to the third embodiment of the present invention. The joining apparatus (1) and the joining method will be described below with a focus on differences from the first and second embodiments. The joining apparatus (1) is a traction drive means that pulls the mandrel (20) in a predetermined direction. (30) and pressing drive means (31) for pressing the mandrel (20) in a predetermined direction. The traction drive means (30) is connected to the tip side portion (20a) of the mandrel (20), and the pressing drive means (31) is connected to the base end side portion (20b) of the mandrel (20). ing.

  When joining the three members to be joined (45), (45), and (45) to the pipe (40) using the joining device (1), the mandrel (20) is attached to the base by the pressing drive means (31). At the same time as pressing in the axial direction of the mandrel (20) from the end portion (20b), the mandrel (20) is pulled in the axial direction of the mandrel (20) from the tip end portion (20a) by the pulling drive means (30). By doing so, each wedge part (21) of the mandrel (20) is forcibly inserted simultaneously into the wedge hole part (5) of the corresponding die (3) of the die connector (2). Thereby, each die segment (4) of each die (3) of the die connected body (2) is simultaneously moved outward in the radial direction of the pipe (40), and each expansion processing target portion (41) of the pipe (40) is thus obtained. ) At the same time. As a result, the three members to be joined (45) (45) (45) are collectively joined to the pipe (40).

  According to the joining method of the third embodiment, buckling of the mandrel (20) can be prevented, and furthermore, tensile fracture between the wedge portions (21) of the mandrel (20) can be prevented.

<Fourth embodiment>
FIG. 8 is a view for explaining a joining device and a joining method according to the fourth embodiment of the present invention. The joining apparatus (1) and joining method will be described below with a focus on differences from the first embodiment.

  In this joining apparatus (1), the taper angle θ (that is, the mandrel (3) of the wedge holes (5), (5), (5) of the three dies (3), (3), (3) of the die connection body (2). The taper angles θ) of the three wedge portions (21), (21), and (21) of 20) are different from each other. Specifically, out of the taper angle θ of the wedge holes (5), (5), and (5) of the three dies (3), (3), and (3), the wedge hole ( 5) has the largest taper angle θ, the taper angle θ of the wedge hole (5) of the right die (3) is the second largest, and the taper angle of the wedge hole (4) of the central die (3). θ is set to be the smallest.

  Moreover, the die segment (4) of the die (3) and the connecting rod (6) of the die connected body (2) are connected to each other through the rotary joint (7) so as to be separable. That is, one end of the connecting rod (6) is detachably connected to one die segment (4) via the rotary joint (7), and the other end of the connecting rod (6) is connected to the other The die segment (4) is detachably connected to each other via a rotary joint (7).

  The rotary joint (7) is rotatable about a rotation axis perpendicular to the moving direction of the die segment (4) during the expanding process and the axial direction of the pipe (40).

  A method of joining the three members to be joined (45), (45), and (45) to the pipe (40) using the joining device (1) is performed in the same manner as in the first embodiment.

  According to the joining method of the fourth embodiment, the expansion processing of the three expansion processing target portions (41), (41), and (41) of the pipe (40) is performed so that the expansion processing amounts (tube expansion amounts) are different from each other. It can be carried out.

<Fifth Embodiment>
FIG. 9 is a view for explaining a joining device and a joining method according to the fifth embodiment of the present invention. The joining apparatus (1) and joining method will be described below with a focus on differences from the first embodiment.

  In the fifth embodiment, the inner diameter of the pipe (40) is not constant but different in the axial direction of the pipe (40). More specifically, the inner diameter of the pipe (40) is set to increase stepwise as it goes to the right end of the pipe (40). Therefore, the inner diameters of the three expansion processing target portions (41) (41) (41) of the pipe (40) are different from each other. The wall thickness of the pipe (40) is set constant in the axial direction of the pipe (40).

  In this joining device (1), the die segment (4) of the die (3) of the die connector (2) and the connecting rod (6) are connected via the rotary joint (7), as in the fourth embodiment. It is separably connected.

  On the other hand, the diameter D of each die (3) of the die connection body (2) is set so as to match the inner diameter of the corresponding expansion processing target portion (41) of the pipe (40), that is, three pieces The diameters D of the dies (3), (3) and (3) are different from each other.

  Further, the taper angle θ of the three dies (3), (3), and (3) of the die connector (2) (5), (5), and (5) (that is, three of the mandrels (20)). The wedge angles (21), (21) and (21) are set to be equal to each other.

  A method of joining the three members to be joined (45), (45), and (45) to the pipe (40) using the joining device (1) is performed in the same manner as in the first embodiment.

  According to the joining method of the fifth embodiment, even when the inner diameters of the three expansion processing target portions (41), (41), and (41) of the pipe (40) are different from each other, these expansion processing is performed. The expanding process of the target portions (41) (41) (41) can be performed reliably.

<Sixth Embodiment>
FIG. 10 is a view for explaining a joining tool according to a sixth embodiment of the present invention.

  In this joining tool (1), the number of divisions of each die (3) of the die connection body (2) is four instead of eight. Moreover, the wedge hole part (5) of each die | dye (3) is a regular quadrangular frustum shape. Therefore, the cross-sectional shape of the wedge hole (5) is a regular square shape.

  Each wedge part (21) of the mandrel (20) is formed in a shape corresponding to the wedge hole part (5) of the die (3), that is, in the shape of a regular quadrangular pyramid.

  A method of joining the three members to be joined (45), (45), and (45) to the pipe (40) using the joining tool (1) is performed in the same manner as in the first embodiment.

  Although several embodiments of the present invention have been described above, the present invention is not limited to those shown in the above embodiments.

  For example, in the first to fifth embodiments, the number of divisions of the die (3) of the die connected body (2) is eight, and in the sixth embodiment, the number of divisions of the die (3) is four. However, in the present invention, the number of divisions of the die (3) is not limited to eight or four, and can be variously changed. For example, the number may be six. The number may be an even number or an odd number.

  In the first to sixth embodiments, the number of dies (3) in the die connection body (2) and the number of wedges (21) in the mandrel (20) are both three. The number of (3) and the number of wedge portions (21) are not limited to three, but are set according to the number of members (45) to be joined. That is, in the present invention, when the number of members to be joined (45) is two, for example, the number of dies (3) and the number of wedges (21) are two, and the members to be joined (45). For example, when the number of dies is four, the number of dies (3) and the number of wedge portions (21) are four.

  In the present invention, the pipe (40) is not limited to a circular cross section, and may be a polygonal cross section such as a square cross section. In the present invention, the pipe (40) may have a partition wall portion (not shown) extending in the axial direction of the pipe (40) in the hollow portion (43).

  Moreover, in this invention, the joining apparatus may be comprised combining 2 or more among the technical ideas applied to the joining apparatus (1) of the said 1st-6th embodiment.

  INDUSTRIAL APPLICABILITY The present invention can be used for a joining method and a joining apparatus for joining a member to be joined such as a plurality of flanges to a pipe.

FIG. 1 is a perspective view of a joined structure in which a plurality of joining members are joined to a pipe by the joining device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the joint structure. FIG. 3 is a perspective view of the joining apparatus. FIG. 4 is a cross-sectional view of a state before joining a plurality of joining members to a pipe. FIG. 5 is a cross-sectional view of a state in the middle of joining a plurality of joining members to a pipe. FIG. 6 is a cross-sectional view of a state before a plurality of joining members are joined to a pipe by the joining device according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view of a state before a plurality of joining members are joined to a pipe by the joining device according to the third embodiment of the present invention. FIG. 8 is a cross-sectional view of a state before a plurality of joining members are joined to a pipe by the joining device according to the fourth embodiment of the present invention. FIG. 9 is a cross-sectional view of a state before a plurality of joining members are joined to a pipe by the joining device according to the fifth embodiment of the present invention. FIG. 10 is a perspective view of a joining apparatus according to the sixth embodiment of the present invention. FIG. 11 is a cross-sectional view for explaining a joining method related to the present invention.

Explanation of symbols

1: Joining device 2: Die coupling body 3: Die 4: Die segment 4a: Pressing convex part 5: Wedge hole part 6: Connecting rod (die segment connecting rod)
7: Rotating joint 8: Supporting part 20: Mandrel 21: Wedge part 30: Traction driving means 31: Pressing driving means 40: Pipe 41: Expanding target part 41a: Insertion part 41b: Near part 42: Expanded part (bulging part )
43: Hollow part 45: Joined member 46: Insertion hole 50: Joining structure

Claims (14)

A plurality of dies that are provided in the center with a wedge hole penetrating in the axial direction and divided into a plurality of die segments in the circumferential direction around the wedge hole are arranged apart from each other in the axial direction. In addition, in two adjacent dies, each die segment of one die and each die segment of the other die are connected to each other via a connecting rod, respectively,
An expanding mandrel in which a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body are formed apart from each other in the axial direction;
The equipped Rutotomoni,
Using a joining device in which a die segment and a connecting rod are connected to each other via a rotary joint ,
With the pipe inserted into the insertion holes provided in each of the plurality of members to be joined, each wedge portion of the mandrel is inserted into the wedge hole portion of the corresponding die of the die connection body disposed in the hollow portion of the pipe. Thus, each die segment of each die of the die connected body is moved outward in the radial direction of the pipe, and thereby, each expansion processing object consisting of the insertion portion into each insertion hole of the pipe and the portions near both sides in the axial direction thereof. A method for joining a pipe and a plurality of members to be joined, wherein at least a part of the portion is expanded, and a plurality of members to be joined are joined to the pipe. The joining method according to claim 1, wherein the taper angles of the wedge hole portions of at least two of the plurality of dies of the die connection body are different from each other. A plurality of dies that are provided in the center with a wedge hole penetrating in the axial direction and divided into a plurality of die segments in the circumferential direction around the wedge hole are arranged apart from each other in the axial direction. In addition, in two adjacent dies, each die segment of one die and each die segment of the other die are connected to each other via a connecting rod, respectively,
An expanding mandrel in which a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body are formed apart from each other in the axial direction;
The equipped Rutotomoni,
The taper angle of the wedge hole portion of at least two dies out of the plurality of dies of the die connection body is different from each other using a joining device,
With the pipe inserted into the insertion holes provided in each of the plurality of members to be joined, each wedge portion of the mandrel is inserted into the wedge hole portion of the corresponding die of the die connection body disposed in the hollow portion of the pipe. Thus, each die segment of each die of the die connected body is moved outward in the radial direction of the pipe, and thereby, each expansion processing object consisting of the insertion portion into each insertion hole of the pipe and the portions near both sides in the axial direction thereof. A method for joining a pipe and a plurality of members to be joined, wherein at least a part of the portion is expanded, and a plurality of members to be joined are joined to the pipe. The joining method according to claim 1, wherein the die segment and the connecting rod are connected so as to be separable from each other.   The joining method according to any one of claims 1 to 4, wherein diameters of at least two dies among the plurality of dies of the die connection body are different from each other.   The joining method according to claim 1, wherein by pulling the mandrel, each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body.   The joining method according to any one of claims 1 to 6, wherein each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body by pressing the mandrel. In a state where the pipe is inserted into the insertion holes provided in each of the plurality of members to be joined, at least one of the parts to be expanded that includes the insertion parts of the pipes into the insertion holes and the parts in the vicinity of both sides in the axial direction. By joining the plurality of members to be joined to the pipe by expanding the part, a joining device of the pipe and the plurality of members to be joined,
A plurality of dies that are provided in the center with a wedge hole penetrating in the axial direction and divided into a plurality of die segments in the circumferential direction around the wedge hole are arranged apart from each other in the axial direction. In addition, in two adjacent dies, each die segment of one die and each die segment of the other die are connected to each other via a connecting rod, respectively,
An expanding mandrel in which a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body are formed apart from each other in the axial direction;
With
Each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body disposed in the hollow portion of the pipe, so that each die segment of the corresponding die of the die connection body is directed radially outward of the pipe. Is to be moved to
Each die segment of the die of the die connecting body, by being moved by the wedge portion of the mandrel radially outward of the pipe state, and are not to expanding process at least a portion of the expanding work regions of the pipe ,
A joining device for a pipe and a plurality of members to be joined, wherein the die segment and the connecting rod are connected to each other through a rotary joint . The joining device according to claim 8, wherein the taper angles of the wedge hole portions of at least two of the plurality of dies of the die connection body are different from each other. In a state where the pipe is inserted into the insertion holes provided in each of the plurality of members to be joined, at least one of the parts to be expanded that includes the insertion parts of the pipes into the insertion holes and the parts in the vicinity of both sides in the axial direction. By joining the plurality of members to be joined to the pipe by expanding the part, a joining device of the pipe and the plurality of members to be joined,
A plurality of dies that are provided in the center with a wedge hole penetrating in the axial direction and divided into a plurality of die segments in the circumferential direction around the wedge hole are arranged apart from each other in the axial direction. In addition, in two adjacent dies, each die segment of one die and each die segment of the other die are connected to each other via a connecting rod, respectively,
An expanding mandrel in which a plurality of wedge portions corresponding to the wedge hole portions of each die of the die connection body are formed apart from each other in the axial direction;
With
Each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body disposed in the hollow portion of the pipe, so that each die segment of the corresponding die of the die connection body is directed radially outward of the pipe. Is to be moved to
Each die segment of the die of the die connecting body, by being moved by the wedge portion of the mandrel radially outward of the pipe state, and are not to expanding process at least a portion of the expanding work regions of the pipe ,
An apparatus for joining a pipe and a plurality of members to be joined , wherein the taper angles of the wedge hole portions of at least two dies among the plurality of dies of the die linking body are different from each other . The joining device according to any one of claims 8 to 10, wherein the die segment and the connecting rod are connected so as to be separable from each other.   The joining device according to any one of claims 8 to 11, wherein diameters of at least two dies among the plurality of dies of the die connection body are different from each other.   The joining device according to any one of claims 8 to 12, further comprising traction drive means for pulling the mandrel in a direction in which each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body.   The joining apparatus according to any one of claims 8 to 13, further comprising a pressing drive unit that presses the mandrel in a direction in which each wedge portion of the mandrel is inserted into a wedge hole portion of a corresponding die of the die connection body.

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