WO2018025666A1 - Member machining method and member joining method - Google Patents

Member machining method and member joining method Download PDF

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Publication number
WO2018025666A1
WO2018025666A1 PCT/JP2017/026469 JP2017026469W WO2018025666A1 WO 2018025666 A1 WO2018025666 A1 WO 2018025666A1 JP 2017026469 W JP2017026469 W JP 2017026469W WO 2018025666 A1 WO2018025666 A1 WO 2018025666A1
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WO
WIPO (PCT)
Prior art keywords
corner
aluminum pipe
joining
shape
peripheral surface
Prior art date
Application number
PCT/JP2017/026469
Other languages
French (fr)
Japanese (ja)
Inventor
康裕 前田
徹 橋村
渡辺　憲一
Original Assignee
株式会社神戸製鋼所
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Publication of WO2018025666A1 publication Critical patent/WO2018025666A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/06—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes in openings, e.g. rolling-in
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08—Tube expanders
    • B21D39/20—Tube expanders with mandrels, e.g. expandable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging

Definitions

  • the present disclosure relates to a member processing method and a member joining method.
  • a low specific gravity and high strength metal called high tension steel is used to reduce the weight and safety of automobiles.
  • High-tension steel is effective in reducing weight and improving safety, but is heavier than low specific gravity materials such as aluminum. Further, when high tension steel is used, problems such as a decrease in formability, an increase in forming load, and a decrease in dimensional accuracy occur due to high strength.
  • multi-materials have been used in which extruded products, cast products, and press-formed products using aluminum having a specific gravity lower than steel are used together with steel parts. .
  • Patent Literature 1 discloses a member joining method that enables joining of dissimilar metals in multi-materials by using an elastic body.
  • a tubular body first member
  • a wall surface body second member
  • an elastic body is inserted inside the tubular body, and the elastic body is pressurized.
  • the tubular body is bulged, and the tubular body and the wall surface are in pressure contact.
  • the embodiment of the present invention has been made under such circumstances, and an object thereof is an expansion deformation process of the first member while suppressing cracking of the first member in a member processing method using an elastic body. It is to be.
  • the member processing method is a hollow shape extending in the axial direction, a corner portion having an R portion is provided on the inner peripheral surface of the cross-sectional shape in the axial direction, and the shape of the corner portion Prepares a first member defined by the following formula and an elastic body, inserts the elastic body into the first member, compresses the elastic body in the axial direction, and reduces the diameter of the axial line Expanding outwardly in the direction, thereby enlarging and deforming the first member.
  • ⁇ angle R c at the inner peripheral surface of the corner of the first member: radius R 1 of the R portion of the inner peripheral surface of the corner of the first member: out of two sides constituting the corner of the first member
  • Linear length L 2 of one side part linear length of the other side part of two side parts constituting the corner part of the first member
  • n n value of material of the first member (work hardening index)
  • a second member having a different strength from the first member and provided with a hole is further prepared, and the first member is provided in the hole of the second member. Including inserting a member, joining the first member and the second member by enlarging and deforming the first member using the above-described member processing method.
  • the elastic member is expanded outward in the radial direction of the axis to uniformly expand and deform the first member, thereby preventing local deformation and reducing the load on each member.
  • the first member can be uniformly deformed by utilizing the property that the elastic body compressed in the axial direction expands uniformly toward the outside in the radial direction of the axial line. Accordingly, the fitting accuracy between the first member and the second member is improved, and the bonding strength can be improved. Further, it is simpler than a joining method in which electromagnetic forming or other processing is performed.
  • the strength of the first member and the second member indicates general properties related to deformation and fracture of the material such as yield strength, tensile strength, ductility, rigidity, or bending strength.
  • ave (L 1 , L 2 ) in the above formula (1) indicates an average value of L 1 and L 2 , and may be simply referred to as L hereinafter.
  • the member is difficult to rotate and the torsional strength can be improved as compared with the case where the cross-sectional shape is circular.
  • the radius of the R portion of the inner peripheral surface of the corner is remarkably large, the shape of the outer peripheral surface of the corner is also rounded, and the amount of catch at the corner when twisted is reduced, which improves the torsional strength.
  • the effect tends to be small. Therefore, R c / L is defined to be smaller than tan ( ⁇ / 2) / 4 as in the above formula (1), and the catching amount of a certain level or more is secured while maintaining the square shape.
  • the deformation force concentrates on the corner portion and breaks during the expansion deformation.
  • the corner is a right angle or a rounded corner with a small radius
  • the deformation force tends to concentrate on the corner, and the corner may be broken before it is sufficiently expanded and deformed.
  • R c / L to be larger than tan ( ⁇ / 2) / ((18 ⁇ n / 2) +2) as in the above formula (1), the inner peripheral surface of the corner portion can be reduced. It has a certain roundness or more, and the rigidity of the corner portion is lowered, and the corner portion is easily deformed. Therefore, cracks at the corners can be suppressed and the first member can be sufficiently enlarged and deformed.
  • the first member includes an outer wall that defines an outer shape, and an inner rib that partitions an inner space in the outer wall, and an R portion is provided on an inner peripheral surface at an intersection where the outer wall and the inner rib are connected.
  • intersection part may be prescribed
  • ⁇ angle r c at the inner peripheral surface of the corner of the intersecting portion of the first member: radius D 1 of the R portion of the inner peripheral surface of the intersecting portion of the first member: constituting the corner of the intersecting portion of the first member straight one side portion of the two sides the length D 2: linear length of one side portion of the two sides constituting a corner of the intersection of the first member n: material of first member N value (work hardening index) May be provided.
  • the rigidity of the first member can be improved.
  • intersection part to which the outer wall and inner rib of the 1st member are connected is prescribed
  • ave (D 1 , D 2 ) in the formula (2) represents an average value of D 1 and D 2 .
  • the shape of the hole of the second member and the cross-sectional shape of the portion inserted through the hole of the first member may be similar.
  • the first member and the second member are similar to each other, the first member can be uniformly expanded and deformed, and a local load is applied to the first member and the second member. It can be prevented from occurring.
  • the similar shape indicates a case viewed from the axial direction.
  • the first member When compressing the elastic body, the first member may also be compressed in the axial direction.
  • the first member can also be compressed in the axial direction to assist the expansion deformation in the outer direction of the first member. That is, the first member can be expanded and deformed more reliably in the outer direction in combination with the expansion deformation force from the inside of the first member by the elastic body.
  • the edge of the hole of the second member may be burring processed.
  • the strength of the hole of the second member can be improved and the deformation of the second member can be prevented. Moreover, since the joining area of a 1st member and a 2nd member increases by burring process, joining strength can be improved.
  • a mold may be disposed outside the first member, and at least a part of the first member may be molded and joined along the mold.
  • the first member can be deformed into an arbitrary shape by using molds having various inner shapes.
  • the shape to be deformed can be appropriately selected from the viewpoint of component performance, etc., and can be made into a shape according to the application.
  • An outer frame mold may be disposed outside the first member, and the outer frame mold may partially restrict the enlarged deformation of the first member and join them.
  • the outer frame mold by using the outer frame mold, it is possible to define a region where the first member is expanded and deformed, and to control the expanded deformation region with high accuracy.
  • the enlarged deformation region refers to a region where the first member is enlarged and deformed outward.
  • the shape of the corner portion of the first member is defined to be easily processed and difficult to break, so that the first member is sufficiently enlarged while suppressing cracking. Can be transformed.
  • graph showing the relationship between R c / L and strain ratio when the theta 90 degrees.
  • graph showing the relationship between R c / L and strain ratio when the ⁇ 70,90,110 degrees.
  • Sectional drawing for demonstrating the dimensional relationship of the aluminum pipe of 2nd Embodiment Sectional drawing before joining of the joining method of the member which concerns on 2nd Embodiment. Sectional drawing in the process of joining of the joining method of the member which concerns on 2nd Embodiment.
  • the perspective view before joining of the hat-type steel components and aluminum pipe which the joining method of the member which concerns on 3rd Embodiment applies.
  • the perspective view after joining of the hat-shaped steel components and the aluminum pipe to which the joining method of the member concerning a 3rd embodiment was applied.
  • Sectional drawing before joining of the joining method of the member which concerns on 3rd Embodiment Sectional drawing in the process of joining of the joining method of the member which concerns on 3rd Embodiment.
  • the steel part 10 is a flat plate made of high-tension steel.
  • the steel part 10 is provided with a hole 11 through which the aluminum pipe 20 can be inserted.
  • the aluminum pipe 20 is made of an aluminum alloy and has a hollow tubular shape extending in the axis L direction.
  • the axis L passes through the center of the aluminum pipe 20 and the center of the hole 11 of the steel part 10. The detailed shape of the aluminum pipe 20 will be described later.
  • the aluminum pipe 20 expands outward in the radial direction of the axis L, so that the aluminum pipe 20 is pressed into the hole 11 of the steel part 10.
  • the shape and dimensions of the hole 11 of the steel part 10 are preferably similar to the cross-sectional shape of the aluminum pipe 20, and are preferably as small as possible within a range in which the aluminum pipe 20 can be inserted.
  • the similar shape indicates a case viewed from the direction of the axis L.
  • rubber (elastic body) 30 is used for joining the steel part 10 and the aluminum pipe 20.
  • the aluminum pipe 20 is inserted into the hole 11 of the steel part 10 and the rubber 30 is inserted into the aluminum pipe 20 to constitute the assembly 1 before joining.
  • the aluminum pipe 20 may be inserted through the hole 11 of the steel part 10 with the rubber 30 inserted therein.
  • the assembly 1 in that state is set in the press device 40.
  • the pressing device 40 includes an indenter 41 and a seat 42.
  • the indenter 41 includes a columnar convex portion 41a extending downward, and a collar portion 41b provided around the convex portion 41a.
  • the lower surface 41c of the convex portion 41a of the indenter 41 is a flat surface.
  • the receiving seat 42 includes a columnar convex portion 42a extending upward and a flange portion 42b provided around the convex portion 42a.
  • the upper surface 42c of the convex portion 42a of the receiving seat 42 is a flat surface, and the rubber 30 is placed on the upper surface 42c of the convex portion 42a of the receiving seat 42.
  • the rubber 30 has a cylindrical shape with a diameter that can be inserted into the aluminum pipe 20.
  • the length of the rubber 30 may be a length that can deform the aluminum pipe 20 in the vicinity of the joint.
  • the type of rubber 30 to be used is not particularly limited, and for example, urethane rubber, chloroprene rubber, CNR rubber (chloroprene rubber + nitrile rubber), silicon rubber, or the like can be used.
  • the rubber 30 is sandwiched between the lower surface 41c of the convex portion 41a of the indenter 41 and the upper surface 42c of the convex portion 42a of the seat 42, and is compressed in the direction of the axis L.
  • the size in the radial direction increases.
  • the rubber 30 is elastically deformed so as to expand from the axis L toward the radially outer side, and the aluminum pipe 20 is expanded and deformed so as to be in pressure contact with the steel part 10.
  • the rubber 30 from which the compressive force of the press device 40 has been removed is restored to its original shape by its own elastic force. Therefore, the rubber 30 can be easily removed from the aluminum pipe 20.
  • the cross-sectional shape of the aluminum pipe 20 is generally trapezoidal in the drawing, but may be other polygonal shapes.
  • the aluminum pipe 20 is provided with corner portions 23a to 23d having R portions 22a to 22d on the inner peripheral surface 21a.
  • the angle ⁇ of the corner portions 23a to 23d on the inner peripheral surface 21a is, for example, in the range of 45 to 135 degrees.
  • the shape of the R portion 22a of the inner peripheral surface 21a of one corner portion 23a is defined by the following equation (3).
  • the shapes of the other corners 23b to 23d are similarly defined.
  • ⁇ angle R c at the inner peripheral surface of the corner of the aluminum pipe
  • R c radius L 1 of the inner peripheral surface of the corner of the aluminum pipe
  • L 1 one side of two sides constituting the corner of the aluminum pipe
  • Straight line length L 2 Straight line length of the other side of two sides constituting the corner of the aluminum pipe
  • n n value of material of the aluminum pipe (work hardening index)
  • ave (L 1 , L 2 ) in the above formula (3) indicates an average value of L 1 and L 2 , and may be simply referred to as L hereinafter.
  • the corner part 23a is provided in the aluminum pipe 20, compared with the case where a cross-sectional shape is circular, the members 10 and 20 are hard to rotate and torsional strength can be improved.
  • R c of R portions 22a of the inner peripheral surface 21a of the corner portion 23a is considerably larger, even rounded shape of the outer peripheral surface 21b of the corner portion 23a, the amount borrowed hook at the corner portion 23a at the time of twisted And the effect of improving torsional strength tends to be small. Therefore, R c / L is defined to be smaller than tan ( ⁇ / 2) / 4 as in the above formula (3), and the catching amount of a certain level or more is ensured while maintaining the square shape.
  • the rigidity of the corner 23a is lowered, and the enlarged deformation of the corner 23a is facilitated. Therefore, the crack of the corner 23a can be suppressed and the aluminum pipe 20 can be sufficiently enlarged and deformed.
  • the above expression (3) is derived from the following two conditional expressions (4) and (5).
  • the above expression (4) is a conditional expression for maintaining the square shape of the corner 23a of the aluminum pipe 20.
  • ave (b 1 , b 2 ) in the above formula (4) indicates an average value of b 1 and b 2 , and may be simply referred to as b hereinafter.
  • b the half length b / 2 of the average value b of the lengths b1 and b2 of the straight portions 24a and 24b longer than the length c of the corner portion 23a, that is, more than a predetermined amount with respect to the corner portion 23a.
  • the above expression (5) is a conditional expression derived by analysis and experiment. Based on the analysis results and experimental results described later, the occurrence of cracks in the aluminum pipe 20 can be suppressed when the condition of Expression (5) is satisfied.
  • the shape of the R portion 22a of the inner peripheral surface 21a of the corner portion 23a defined by the above formula (3) is the conditional formula (4) for maintaining the square shape and the conditional formula (5) that can suppress the occurrence of cracks. Satisfy both.
  • the above formula (3) will be described in detail based on the results of analysis and experiment.
  • the material of the aluminum pipe 20 is aluminum, and the n value is 0.2.
  • the expression (3) is expressed as the following expression (9): , R c / L.
  • the upper line (corner distortion) in the graph is an analysis result when it is assumed that only the corner 23a is deformed. That is, the corner distortion can be expressed as ⁇ c / c, where ⁇ c is the amount of change in the length c of the corner.
  • the lower line (straight line portion strain) in the graph is an analysis result when it is assumed that only the straight portion 24a is deformed.
  • the straight portion distortion can be expressed as ⁇ b / (b / 2), where ⁇ b is the amount of change in the half length b / 2 of the length of the straight portion.
  • ⁇ b is the amount of change in the half length b / 2 of the length of the straight portion.
  • strain ratio can be expressed as ( ⁇ c / c) / ( ⁇ b / (b / 2)), which can be approximated as b / 2c.
  • a broken line portion in the graph indicates a portion that deviates from the condition of the above equation (9), and a solid line portion indicates a portion that satisfies the condition of the above equation (9). That is, the solid line portion in the graph is a preferable range for joining.
  • Rc when Rc is 0, it indicates that the R portion does not exist and the inner peripheral surface 21a of the corner portion 23a is a right angle. Accordingly, it is considered that there is a threshold value that causes cracking when R c / L is between 0.0375 and 0.0625.
  • the threshold value is set to 0.05.
  • FIG. 4C shows a graph obtained by adding the case where the angle ⁇ is 70,110 degrees to the graph of FIG. 4B.
  • the angle ⁇ is 70 ° and the angle ⁇ is 70 °
  • cracks are considered to occur when the strain ratio is 9 or more, and the same is required to maintain the angular shape of the corner portion 23a.
  • the following two expressions (10) are derived. In this way, a preferable range of R c / L can be derived even when the angle ⁇ is changed, and the shape of the aluminum pipe 20 suitable for joining can be defined.
  • the cross-sectional shape of the aluminum pipe 20 may not be similar to the cross-sectional shapes of the inner peripheral surface 21a and the outer peripheral surface 21b.
  • the plate thickness may not be constant.
  • it has a substantially square cross section having four corners 23a to 23d.
  • R portions 22a to 22d are provided on the inner peripheral surface 21a of the corners 23a to 23d, and the corners 23a to 23d are provided.
  • the outer peripheral surface 21b may not have the R portion.
  • outer frames 41d and 42d may be disposed outside the portion of the aluminum pipe 20 that is not enlarged and deformed (the end in this modified example). Good.
  • the outer frames 41d and 42d are cylindrical and are arranged around both ends of the aluminum pipe 20.
  • burring may be performed on the edge of the hole 11 of the steel part 10.
  • the strength of the hole 11 of the steel part 10 can be improved and the deformation of the steel part 10 can be prevented.
  • the joining area of the steel part 10 and the aluminum pipe 20 is increased by burring, the joining strength can be improved.
  • the processing method for enlarging and deforming the aluminum pipe 20 used in the member joining method of the present embodiment may be used independently of the joining. That is, the aluminum pipe 20 can be enlarged and deformed by the rubber 30 regardless of the joining with the steel part 10 to obtain a desired shape.
  • (Second Embodiment) 8 to 9B show a method for joining members according to the second embodiment of the present invention.
  • the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
  • the aluminum pipe 20 includes an outer wall 25 that defines an outer shape, and an inner rib 26 that partitions an internal space in the outer wall 25.
  • the inner rib 26 is formed in a cross shape when viewed from the direction of the axis L, and divides the internal space in the outer wall 25 into four. Therefore, the aluminum pipe 20 includes four inner peripheral surfaces 21c to 21f.
  • the four intersecting portions 27a to 27d to which the outer wall 25 and the inner rib 26 are connected are provided with corner portions 23e to 23l having R portions 22e to 22l, respectively.
  • corner portions 23e to 23l for example, the shape of the R portion 22e of the inner peripheral surface 21c of one corner portion 23e is defined by the following equation (11). In the present embodiment, the shapes of the other corner portions 23f to 23l are similarly defined.
  • phi angle of the inner peripheral surface of the corner of the intersection of the aluminum pipe
  • r c radius D 1 of the R portion of the intersection of the aluminum pipe: one of the two sides constituting a corner of the intersection of the aluminum pipe
  • Linear length D 2 of the side of the other Of the two sides constituting the corner of the intersection of the aluminum pipe, the linear length of the other side
  • n n value of the material of the aluminum pipe (work hardening index)
  • ave (D 1 , D 2 ) in the formula (11) indicates an average value of D 1 and D 2 .
  • the above equation (11) corresponds to the equation (3) of the first embodiment. Therefore, the derivation and significance of Expression (11) are the same as Expression (3) of the first embodiment.
  • a groove 41e corresponding to the inner rib 26 is provided on the convex portion 41a of the indenter 41 of the present embodiment. Therefore, even if the convex portion 41a of the indenter 41 is inserted into the aluminum pipe 20, the rubber 30 can be pressed without interfering with the inner rib 26.
  • the rigidity of the aluminum pipe 20 can be improved. Further, by defining the shapes of the corner portions 23e to 23l of the intersecting portions 27a to 27d of the aluminum pipe 20 as shown in the equation (10), the cracks of the intersecting portions 27a to 27d can be suppressed and the outer wall 25 and the inner rib 26 can be formed. Can be enlarged and deformed.
  • (Third embodiment) 10A to 11D show a method for joining members according to the third embodiment of the present invention.
  • the same components as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.
  • the steel part 10 has a channel shape made of high tension steel.
  • the steel part 10 includes a bottom wall 12, two side walls 13 that extend vertically upward from the bottom wall 12, and an upper wall 14 that extends outward from each of the two side walls 13 in the horizontal direction.
  • the bottom wall 12 is provided with a hole 11 through which the aluminum pipe 20 can be inserted.
  • the aluminum pipe 20 expands and deforms radially outward, and is joined to the hole 11 of the steel part 10 by crushing the upper end in the drawing.
  • the members 10 and 20 may be joined not only by deforming and expanding the aluminum pipe 20 but also by crushing the ends.
  • the press device 40 includes an indenter 41 and a receiving seat 42.
  • the indenter 41 has a flat lower surface 41c.
  • the seat 42 has a flat upper surface 42c, and the steel part 10 and the rubber 30 are placed on the upper surface 42c.
  • the rubber 30 has a cylindrical shape with a diameter that can be inserted into the aluminum pipe 20, and has a longer overall length than the aluminum pipe 20.
  • the rubber 30 partially protrudes from the upper end of the aluminum pipe 20. For this reason, when the press device 40 starts pressing and the seat 42 and the indenter 41 relatively approach each other, the rubber 30 is pressed first.
  • the rubber 30 does not necessarily have to protrude from the upper end of the aluminum pipe 20 and may be accommodated in or flush with the upper end of the aluminum pipe 20.
  • the rubber 30 is compressed in the direction of the axis L by the press device 40.
  • the size in the radial direction increases.
  • the rubber 30 is expanded outward from the axis L, and the aluminum pipe 20 is expanded and deformed.
  • the aluminum pipe 20 is further expanded and deformed by further compression by the pressing device 40, and at the same time, the upper end in the drawing of the aluminum pipe 20 is bent toward the steel part 10 and pushed. Crushing and joining with the steel part 10.
  • the rubber 30 from which the compressive force of the press device 40 has been removed is restored to its original shape by its own elastic force. Therefore, the rubber 30 can be easily removed from the aluminum pipe 20.
  • the shape of the steel part 10 may be a hat shape or other shapes, and is not particularly limited.
  • the aspect of joining including the aspect of the press apparatus 40 is not specifically limited, It can variously, such as pipe expansion joining or the joining which crushed the edge part.
  • (Fourth embodiment) 12A and 12B show a method for joining members according to the fourth embodiment of the present invention.
  • the same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.
  • the steel part 10 and the aluminum pipe 20 are joined using the mold 43.
  • the mold frame 43 has a cylindrical shape concentric with the aluminum pipe 20.
  • the mold 43 is disposed between the seat 42 and the steel part 10 and outside the aluminum pipe 20.
  • a gap is provided between the aluminum pipe 20 and the mold frame 43.
  • FIG. 12B by pressing with the indenter 41, the inner shape of the mold 43 can be adjusted when the aluminum pipe 20 is enlarged and deformed.
  • the inner shape of the mold 43 can be changed to various polygonal shapes.
  • the shape may be appropriately selected from the viewpoint of component performance. For example, when the aluminum pipe 20 is a bumper stay which is one of the automobile parts, if a minute unevenness is given to the inner surface of the mold 43, the minute uneven shape is transferred to the aluminum pipe 20, and at the time of collision. The impact energy absorption performance can be improved.
  • (Fifth embodiment) 13A and 13B show a method for joining members according to the fifth embodiment of the present invention.
  • the same components as those in the first to fourth embodiments are denoted by the same reference numerals and description thereof is omitted.
  • a cylindrical outer frame mold 44 that partially restricts expansion deformation is disposed around the aluminum pipe 20.
  • the outer frame mold 44 has an enlarged diameter portion 44a having a large inner diameter in the vicinity of the joint at the upper end so that only the vicinity of the joint is enlarged and deformed.
  • the inner diameter other than the enlarged diameter portion 44a is approximately equal to the outer diameter of the aluminum pipe 20.
  • the enlarged deformation region can be controlled with high accuracy so that only the vicinity of the joint portion of the aluminum pipe 20 is enlarged and deformed.
  • the enlarged deformation region refers to a region in which the aluminum pipe 20 is enlarged and deformed outward.
  • the indenter 41 provided in the press device 40 may have a truncated cone shape that is tapered downward in the drawing.
  • a high forming force may be required for the enlarged deformation of the end of the aluminum pipe 20 protruding upward in the drawing of the steel part 10.
  • the shape of the indenter 41 that can directly deform the aluminum pipe 20 by the indenter 41 is effective.
  • the upper end of the aluminum pipe 20 protruding upward from the steel part 10 is directly pushed outward by the indenter 41 without the rubber 30 interposed therebetween. It is bent towards the steel part 10. Thereby, it can join more firmly. Further, since an excessive load does not act on the rubber 30, the durability of the rubber 30 is improved.

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  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

This member machining method comprises: preparing a rubber 30 and an aluminum pipe 20 which has a hollow shape extending in an axis L direction and an inner circumferential surface 21a of which has a cross-sectional shape, in the axis L direction, provided with a corner part 23a having a round section 22a, the shape of the corner part 23a being defined by the expression below; inserting the rubber 30 into the aluminum pipe 20; and enlarging, deforming, and machining the aluminum pipe 20 by compressing the rubber 30 in the axis L direction and by expanding the rubber 30 radially outward with respect to the axis L. θ represents the angle of a corner part of a first member on the inner circumferential surface, Rc represents the radius, at the round section, of the inner circumferential surface of the corner part of the first member, L1 represents the straight-line length of one of two side parts forming the corner part of the first member, L2 represents the straight-line length of the other one of the two side parts forming the corner part of the first member, and n represents an n value (a work-hardening index) of a material of the first member.

Description

部材の加工方法および部材の接合方法Member processing method and member joining method
　本開示は、部材の加工方法および部材の接合方法に関する。 The present disclosure relates to a member processing method and a member joining method.
　自動車の軽量化および安全性向上のために、ハイテンション鋼と呼ばれる低比重かつ高強度の金属が使用されている。ハイテンション鋼は軽量化および安全性向上に有効であるが、アルミなどの低比重材料と比較すると重い。また、ハイテンション鋼を使用すると、高強度ゆえに、成形性の低下、成形荷重の上昇、および寸法精度の低下などの問題が生じる。これらの問題を解決するために、近年、鋼よりも低比重のアルミを用いた押し出し成形品、鋳造品、およびプレス成形品を、鋼製部品と合わせて活用するマルチマテリアル化が行われている。 A low specific gravity and high strength metal called high tension steel is used to reduce the weight and safety of automobiles. High-tension steel is effective in reducing weight and improving safety, but is heavier than low specific gravity materials such as aluminum. Further, when high tension steel is used, problems such as a decrease in formability, an increase in forming load, and a decrease in dimensional accuracy occur due to high strength. In order to solve these problems, in recent years, multi-materials have been used in which extruded products, cast products, and press-formed products using aluminum having a specific gravity lower than steel are used together with steel parts. .
　マルチマテリアル化で問題となるのは鋼製部品とアルミ製部品のような異種金属の接合である。例えば特許文献１には、弾性体を利用することによりマルチマテリアル化における異種金属の接合を可能にする部材の接合方法が開示されている。特許文献１の部材の接合方法では、壁面体（第２部材）の貫通孔に管体（第１部材）を挿入し、管体の内側に弾性体を挿入し、弾性体を加圧することで管体を膨出させ、管体と壁面体を圧接している。 The problem with multi-materials is the joining of dissimilar metals such as steel parts and aluminum parts. For example, Patent Literature 1 discloses a member joining method that enables joining of dissimilar metals in multi-materials by using an elastic body. In the member joining method of Patent Document 1, a tubular body (first member) is inserted into a through hole of a wall surface body (second member), an elastic body is inserted inside the tubular body, and the elastic body is pressurized. The tubular body is bulged, and the tubular body and the wall surface are in pressure contact.
特開昭５１－１３３１７０号公報JP 51-133170 A
　しかし、特許文献１に開示された接合方法では、接合される部材の形状について、特に接合される管が多角形管であることについては言及されていない。即ち、接合される管が多角形管である場合、加工し易くかつ割れを抑制できるなどの接合に好ましい詳細な形状については考慮されていない。 However, in the joining method disclosed in Patent Document 1, there is no mention of the shape of the members to be joined, particularly that the joined pipe is a polygonal pipe. That is, when the pipe to be joined is a polygonal pipe, a detailed shape preferable for joining such as being easy to process and suppressing cracking is not considered.
　本発明の実施形態はこうした状況の下になされたものであって、その目的は、弾性体を利用した部材の加工方法において、第１部材の割れを抑制しつつ、第１部材を拡大変形加工することである。 The embodiment of the present invention has been made under such circumstances, and an object thereof is an expansion deformation process of the first member while suppressing cracking of the first member in a member processing method using an elastic body. It is to be.
　本発明の第１の態様の部材の加工方法は、軸線方向に延びた中空状であり、前記軸線方向の断面形状の内周面にＲ部を有する角部が設けられ、前記角部の形状が以下の式によって規定されている第１部材と、弾性体とを準備し、前記第１部材の内部に前記弾性体を挿入し、前記弾性体を前記軸線方向に圧縮して前記軸線の径方向外側に向けて膨張させ、それによって前記第１部材を拡大変形加工することを含む。 The member processing method according to the first aspect of the present invention is a hollow shape extending in the axial direction, a corner portion having an R portion is provided on the inner peripheral surface of the cross-sectional shape in the axial direction, and the shape of the corner portion Prepares a first member defined by the following formula and an elastic body, inserts the elastic body into the first member, compresses the elastic body in the axial direction, and reduces the diameter of the axial line Expanding outwardly in the direction, thereby enlarging and deforming the first member.
Figure JPOXMLDOC01-appb-M000003
θ：第１部材の角部の内周面における角度
Ｒｃ：第１部材の角部の内周面のＲ部の半径
Ｌ１：第１部材の角部を構成する２つの辺部のうち一方の辺部の直線長さ
Ｌ２：第１部材の角部を構成する２つの辺部のうち他方の辺部の直線長さ
ｎ：第１部材の材料のｎ値（加工硬化指数）
を備える、部材の加工方法を提供する。
Figure JPOXMLDOC01-appb-M000003
θ: angle R c at the inner peripheral surface of the corner of the first member: radius R 1 of the R portion of the inner peripheral surface of the corner of the first member: out of two sides constituting the corner of the first member Linear length L 2 of one side part: linear length of the other side part of two side parts constituting the corner part of the first member n: n value of material of the first member (work hardening index)
A member processing method is provided.
　本発明の第２の態様の部材の接合方法は、前記第１部材とは強度が異なり、穴部が設けられた第２部材をさらに準備し、前記第２部材の前記穴部に前記第１部材を挿通し、上記の部材の加工方法を使用して前記第１部材を拡大変形加工して前記第１部材と前記第２部材とを接合することを含む。 In the method for joining members according to the second aspect of the present invention, a second member having a different strength from the first member and provided with a hole is further prepared, and the first member is provided in the hole of the second member. Including inserting a member, joining the first member and the second member by enlarging and deforming the first member using the above-described member processing method.
　これらの方法によれば、弾性体を軸線の径方向外側へ膨張させて第１部材を均等に拡大変形することで、局所的な変形を防止し、各部材に対する負荷を軽減できる。これは軸線方向に圧縮された弾性体が軸線の径方向外側に向かって均等に膨張する性質を利用し、第１部材を均等に変形できるためである。従って、第１部材と第２部材の嵌合精度が向上し、接合強度を向上できる。また、電磁成形またはその他の加工を施す接合方法と比べて簡易である。ここで、第１部材と第２部材の強度とは、降伏強さ、引張強さ、延性、剛性、または曲げ強度など材料の変形および破壊に関連する性質全般のことを示す。また、上記の式（１）中のａｖｅ（Ｌ１，Ｌ２）は、Ｌ１とＬ２の平均値を示し、以降単にＬという場合がある。 According to these methods, the elastic member is expanded outward in the radial direction of the axis to uniformly expand and deform the first member, thereby preventing local deformation and reducing the load on each member. This is because the first member can be uniformly deformed by utilizing the property that the elastic body compressed in the axial direction expands uniformly toward the outside in the radial direction of the axial line. Accordingly, the fitting accuracy between the first member and the second member is improved, and the bonding strength can be improved. Further, it is simpler than a joining method in which electromagnetic forming or other processing is performed. Here, the strength of the first member and the second member indicates general properties related to deformation and fracture of the material such as yield strength, tensile strength, ductility, rigidity, or bending strength. Further, ave (L 1 , L 2 ) in the above formula (1) indicates an average value of L 1 and L 2 , and may be simply referred to as L hereinafter.
　また、第１部材には角部が設けられているため、断面形状が円形の場合と比べ、部材が回転し難く、ねじり強度を向上できる。ただし、角部の内周面のＲ部の半径が著しく大きい場合、角部の外周面の形状も丸みを帯び、ねじられた際の角部での引掛かり量が小さくなり、ねじり強度向上の効果も小さくなり易い。そのため、上記の式（１）のようにＲｃ／Ｌをｔａｎ(θ／２)／４よりも小さく規定し、角形状を維持して一定以上の引掛かり量を確保している。 In addition, since the first member is provided with corners, the member is difficult to rotate and the torsional strength can be improved as compared with the case where the cross-sectional shape is circular. However, if the radius of the R portion of the inner peripheral surface of the corner is remarkably large, the shape of the outer peripheral surface of the corner is also rounded, and the amount of catch at the corner when twisted is reduced, which improves the torsional strength. The effect tends to be small. Therefore, R c / L is defined to be smaller than tan (θ / 2) / 4 as in the above formula (1), and the catching amount of a certain level or more is secured while maintaining the square shape.
　また、第１部材に角部が設けられている場合、拡大変形の際に角部に変形力が集中して割れるおそれがある。特に角部が直角または小半径の丸角の場合、変形力が角部に集中し易く、十分に拡大変形する前に角部が割れることがある。これに対し、上記の式（１）のように、Ｒｃ／Ｌをｔａｎ(θ／２)／（（１８×ｎ／２）＋２）よりも大きく規定することで角部の内周面が一定以上の丸みを有し、角部の剛性が低下して角部の拡大変形が容易となる。従って、角部の割れを抑制できると共に第１部材を十分に拡大変形できる。 In addition, when the first member is provided with a corner portion, there is a possibility that the deformation force concentrates on the corner portion and breaks during the expansion deformation. In particular, when the corner is a right angle or a rounded corner with a small radius, the deformation force tends to concentrate on the corner, and the corner may be broken before it is sufficiently expanded and deformed. On the other hand, by defining R c / L to be larger than tan (θ / 2) / ((18 × n / 2) +2) as in the above formula (1), the inner peripheral surface of the corner portion can be reduced. It has a certain roundness or more, and the rigidity of the corner portion is lowered, and the corner portion is easily deformed. Therefore, cracks at the corners can be suppressed and the first member can be sufficiently enlarged and deformed.
　前記第１部材は、外形を画定する外壁と、前記外壁内の内部空間を仕切る内リブとを備え、前記外壁と前記内リブが接続されている交差部には、内周面にＲ部を有する角部が設けられ、前記交差部の前記角部の形状が以下の式によって規定されていてもよい。 The first member includes an outer wall that defines an outer shape, and an inner rib that partitions an inner space in the outer wall, and an R portion is provided on an inner peripheral surface at an intersection where the outer wall and the inner rib are connected. The corner | angular part which has is provided, and the shape of the said corner | angular part of the said cross | intersection part may be prescribed | regulated by the following formula | equation.
Figure JPOXMLDOC01-appb-M000004
φ：第１部材の交差部の角部の内周面における角度
ｒc：第１部材の交差部の内周面のＲ部の半径
Ｄ１：第１部材の交差部の角部を構成する２つの辺部のうち一方の辺部の直線長さ
Ｄ２：第１部材の交差部の角部を構成する２つの辺部のうち一方の辺部の直線長さ
ｎ：第１部材の材料のｎ値（加工硬化指数）
を備えてもよい。
Figure JPOXMLDOC01-appb-M000004
φ: angle r c at the inner peripheral surface of the corner of the intersecting portion of the first member: radius D 1 of the R portion of the inner peripheral surface of the intersecting portion of the first member: constituting the corner of the intersecting portion of the first member straight one side portion of the two sides the length D 2: linear length of one side portion of the two sides constituting a corner of the intersection of the first member n: material of first member N value (work hardening index)
May be provided.
　この方法によれば、第１部材が内リブを備えるため、第１部材の剛性を向上できる。また、第１部材の外壁と内リブが接続されている交差部の角部の形状も式（１）と同様に式（２）で規定することで、交差部の割れを抑制できると共に外壁および内リブを拡大変形できる。ここで、式（２）中のａｖｅ（Ｄ１，Ｄ２）は、Ｄ１とＤ２の平均値を示す。 According to this method, since the first member includes the inner rib, the rigidity of the first member can be improved. Moreover, the shape of the corner | angular part of the cross | intersection part to which the outer wall and inner rib of the 1st member are connected is prescribed | regulated by Formula (2) similarly to Formula (1), and while being able to suppress a crack of a cross | intersection part, an outer wall and The inner rib can be enlarged and deformed. Here, ave (D 1 , D 2 ) in the formula (2) represents an average value of D 1 and D 2 .
　前記第２部材の前記穴部の形状と前記第１部材の前記穴部に挿通される部分の断面形状は相似形であってもよい。 The shape of the hole of the second member and the cross-sectional shape of the portion inserted through the hole of the first member may be similar.
　この方法によれば、第１部材と第２部材が互いに相似形であることで、第１部材を均等に拡大変形して接合でき、第１部材と第２部材に対して局所的な負荷が発生することを防止できる。ここで、相似形とは、軸線方向から見た場合を示している。 According to this method, since the first member and the second member are similar to each other, the first member can be uniformly expanded and deformed, and a local load is applied to the first member and the second member. It can be prevented from occurring. Here, the similar shape indicates a case viewed from the axial direction.
　前記弾性体を圧縮する際、前記第１部材も前記軸線方向に圧縮してもよい。 When compressing the elastic body, the first member may also be compressed in the axial direction.
　この方法によれば、第１部材も軸線方向に圧縮することで第１部材の外側方向の拡大変形を補助できる。即ち、弾性体による第１部材の内側からの拡大変形力と合わせて、より確実に第１部材を外側方向へ拡大変形し、接合できる。 According to this method, the first member can also be compressed in the axial direction to assist the expansion deformation in the outer direction of the first member. That is, the first member can be expanded and deformed more reliably in the outer direction in combination with the expansion deformation force from the inside of the first member by the elastic body.
　前記第２部材の前記穴部の縁はバーリング加工されていてもよい。 The edge of the hole of the second member may be burring processed.
　この方法によれば、第２部材の穴部の縁をバーリング加工することで、第２部材の穴部の強度を向上でき、第２部材の変形を防止できる。また、バーリング加工により第１部材と第２部材の接合面積が増加するため、接合強度を向上できる。 According to this method, by burring the edge of the hole of the second member, the strength of the hole of the second member can be improved and the deformation of the second member can be prevented. Moreover, since the joining area of a 1st member and a 2nd member increases by burring process, joining strength can be improved.
　前記第１部材の外側に型枠を配置し、前記第１部材の少なくとも一部を前記型枠に沿うように成形して接合してもよい。 A mold may be disposed outside the first member, and at least a part of the first member may be molded and joined along the mold.
　この方法によれば、様々な内面形状の型枠を使用することで、第１部材を任意の形状に変形できる。変形させる形状は部品性能の観点などから適宜選択し、用途に応じた形状にできる。 </ RTI> According to this method, the first member can be deformed into an arbitrary shape by using molds having various inner shapes. The shape to be deformed can be appropriately selected from the viewpoint of component performance, etc., and can be made into a shape according to the application.
　前記第１部材の外側に外枠金型を配置し、前記外枠金型により前記第１部材の拡大変形を部分的に制限して接合してもよい。 An outer frame mold may be disposed outside the first member, and the outer frame mold may partially restrict the enlarged deformation of the first member and join them.
　この方法によれば、外枠金型を使用することで、第１部材の拡大変形する領域を規定し、高精度に拡大変形領域を制御できる。ここで拡大変形領域とは、第１部材が外側に向かって拡大変形した領域をいう。 According to this method, by using the outer frame mold, it is possible to define a region where the first member is expanded and deformed, and to control the expanded deformation region with high accuracy. Here, the enlarged deformation region refers to a region where the first member is enlarged and deformed outward.
　本発明によれば、弾性体を利用した部材の加工方法において、第１部材の角部の形状を加工し易くかつ割れ難く規定しているため、割れを抑制すると共に第１部材を十分に拡大変形できる。 According to the present invention, in the method of processing a member using an elastic body, the shape of the corner portion of the first member is defined to be easily processed and difficult to break, so that the first member is sufficiently enlarged while suppressing cracking. Can be transformed.
本発明の第１実施形態に係る部材の接合方法を適用する鋼製部品とアルミパイプの接合前の斜視図。The perspective view before joining of steel components and aluminum pipes which apply the joining method of the member concerning a 1st embodiment of the present invention. 本発明の第１実施形態に係る部材の接合方法を適用した鋼製部品とアルミパイプの接合後の斜視図。The perspective view after joining of steel parts and the aluminum pipe which applied the joining method of the member concerning a 1st embodiment of the present invention. 第１実施形態に係る部材の接合方法の接合前の断面図。Sectional drawing before joining of the joining method of the member which concerns on 1st Embodiment. 第１実施形態に係る部材の接合方法の接合前の断面図。Sectional drawing before joining of the joining method of the member which concerns on 1st Embodiment. 第１実施形態に係る部材の接合方法の接合中の断面図。Sectional drawing in the process of joining of the joining method of the member which concerns on 1st Embodiment. 第１実施形態に係る部材の接合方法の接合後の断面図。Sectional drawing after joining of the joining method of the member which concerns on 1st Embodiment. 第１実施形態のアルミパイプの寸法関係を説明するための断面図および部分拡大図。Sectional drawing and the elements on larger scale for demonstrating the dimensional relationship of the aluminum pipe of 1st Embodiment. 辺部と角部についての拡管量とひずみの関係を示すグラフ。The graph which shows the relationship between the amount of pipe expansion about a side part and a corner | angular part, and distortion. θ＝９０度のときのＲｃ／Ｌとひずみ比の関係を示すグラフ。graph showing the relationship between R c / L and strain ratio when the theta = 90 degrees. θ＝７０，９０，１１０度のときのＲｃ／Ｌとひずみ比の関係を示すグラフ。graph showing the relationship between R c / L and strain ratio when the θ = 70,90,110 degrees. 第１実施形態の第１変形例のアルミパイプを示す断面図。Sectional drawing which shows the aluminum pipe of the 1st modification of 1st Embodiment. 第１実施形態の第２変形例の接合前の断面図。Sectional drawing before joining of the 2nd modification of 1st Embodiment. 第１実施形態の第２変形例の接合中の断面図。Sectional drawing in the middle of joining of the 2nd modification of 1st Embodiment. 第１実施形態の第３変形例の接合前の断面図。Sectional drawing before joining of the 3rd modification of 1st Embodiment. 第１実施形態の第３変形例の接合後の断面図。Sectional drawing after joining of the 3rd modification of 1st Embodiment. 第２実施形態のアルミパイプの寸法関係を説明するための断面図。Sectional drawing for demonstrating the dimensional relationship of the aluminum pipe of 2nd Embodiment. 第２実施形態に係る部材の接合方法の接合前の断面図。Sectional drawing before joining of the joining method of the member which concerns on 2nd Embodiment. 第２実施形態に係る部材の接合方法の接合中の断面図。Sectional drawing in the process of joining of the joining method of the member which concerns on 2nd Embodiment. 第３実施形態に係る部材の接合方法の適用するハット型の鋼製部品とアルミパイプの接合前の斜視図。The perspective view before joining of the hat-type steel components and aluminum pipe which the joining method of the member which concerns on 3rd Embodiment applies. 第３実施形態に係る部材の接合方法の適用したハット型の鋼製部品とアルミパイプの接合後の斜視図。The perspective view after joining of the hat-shaped steel components and the aluminum pipe to which the joining method of the member concerning a 3rd embodiment was applied. 第３実施形態に係る部材の接合方法の接合前の断面図。Sectional drawing before joining of the joining method of the member which concerns on 3rd Embodiment. 第３実施形態に係る部材の接合方法の接合中の断面図。Sectional drawing in the process of joining of the joining method of the member which concerns on 3rd Embodiment. 第３実施形態に係る部材の接合方法の接合中の断面図。Sectional drawing in the process of joining of the joining method of the member which concerns on 3rd Embodiment. 第３実施形態に係る部材の接合方法の接合後の断面図。Sectional drawing after joining of the joining method of the member which concerns on 3rd Embodiment. 第４実施形態に係る部材の接合方法の接合前の断面図。Sectional drawing before joining of the joining method of the member which concerns on 4th Embodiment. 第４実施形態に係る部材の接合方法の接合中の断面図。Sectional drawing in the process of joining of the joining method of the member which concerns on 4th Embodiment. 第５実施形態に係る部材の接合方法の接合前の断面図。Sectional drawing before joining of the joining method of the member which concerns on 5th Embodiment. 第５実施形態に係る部材の接合方法の接合中の断面図。Sectional drawing in the process of joining of the joining method of the member which concerns on 5th Embodiment. 第５実施形態の変形例の接合前の断面図。Sectional drawing before joining of the modification of 5th Embodiment. 第５実施形態の変形例の接合中の断面図。Sectional drawing in the process of joining of the modification of 5th Embodiment.
　以下、添付図面を参照して本発明の実施形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
（第１実施形態）
　図１Ａから２Ｄを参照して、アルミパイプ（第１部材）２０と鋼製部品（第２部材）１０を接合する部材の接合方法について説明する。以下では、異種金属の接合の例として、鋼製部品１０とアルミパイプ２０を接合した例を示しているが、接合する部材の材質は特に限定されず、強度が異なっていれば、鋼製またはアルミ製以外であってもよい。ここで、強度とは、降伏強さ、引張強さ、延性、剛性、または曲げ強度など材料の変形および破壊に関連する性質全般のことを示す。これは以降の第２～第５実施形態についても同様である。 (First embodiment)
With reference to FIGS. 1A to 2D, a method for joining members that join the aluminum pipe (first member) 20 and the steel part (second member) 10 will be described. In the following, as an example of joining dissimilar metals, an example in which the steel part 10 and the aluminum pipe 20 are joined is shown, but the material of the member to be joined is not particularly limited. It may be other than aluminum. Here, the strength indicates general properties related to deformation and fracture of a material such as yield strength, tensile strength, ductility, rigidity, or bending strength. The same applies to the following second to fifth embodiments.
　図１Ａに示すように、鋼製部品１０はハイテンション鋼からなる平板である。鋼製部品１０には、アルミパイプ２０を挿通可能な穴部１１が設けられている。アルミパイプ２０は、アルミニウム合金製であり、軸線Ｌ方向に延びた中空の管状である。軸線Ｌは、アルミパイプ２０の中心と、鋼製部品１０の穴部１１の中心とを通っている。アルミパイプ２０の詳細な形状は後述する。 As shown in FIG. 1A, the steel part 10 is a flat plate made of high-tension steel. The steel part 10 is provided with a hole 11 through which the aluminum pipe 20 can be inserted. The aluminum pipe 20 is made of an aluminum alloy and has a hollow tubular shape extending in the axis L direction. The axis L passes through the center of the aluminum pipe 20 and the center of the hole 11 of the steel part 10. The detailed shape of the aluminum pipe 20 will be described later.
　図１Ｂに示すように、アルミパイプ２０が軸線Ｌの径方向外側へ膨張することで、アルミパイプ２０が鋼製部品１０の穴部１１に圧接される。鋼製部品１０の穴部１１の形状と寸法は、アルミパイプ２０の断面形状と相似形であることが好ましく、さらにアルミパイプ２０が挿通可能な範囲で極力小さい方が好ましい。ここで、相似形とは、軸線Ｌ方向から見た場合を示している。 As shown in FIG. 1B, the aluminum pipe 20 expands outward in the radial direction of the axis L, so that the aluminum pipe 20 is pressed into the hole 11 of the steel part 10. The shape and dimensions of the hole 11 of the steel part 10 are preferably similar to the cross-sectional shape of the aluminum pipe 20, and are preferably as small as possible within a range in which the aluminum pipe 20 can be inserted. Here, the similar shape indicates a case viewed from the direction of the axis L.
　図２Ａから図２Ｄに示すように、鋼製部品１０とアルミパイプ２０の接合には、ゴム（弾性体）３０が使用される。 As shown in FIGS. 2A to 2D, rubber (elastic body) 30 is used for joining the steel part 10 and the aluminum pipe 20.
　まず、図２Ａに示すように、鋼製部品１０の穴部１１にアルミパイプ２０を挿通し、アルミパイプ２０の内部にゴム３０を挿入し、接合前の組立体１を構成する。このとき、アルミパイプ２０は、内部にゴム３０を挿入された状態で鋼製部品１０の穴部１１に挿通されてもよい。そして、図２Ｂに示すように、その状態の組立体１をプレス装置４０にセットする。 First, as shown in FIG. 2A, the aluminum pipe 20 is inserted into the hole 11 of the steel part 10 and the rubber 30 is inserted into the aluminum pipe 20 to constitute the assembly 1 before joining. At this time, the aluminum pipe 20 may be inserted through the hole 11 of the steel part 10 with the rubber 30 inserted therein. Then, as shown in FIG. 2B, the assembly 1 in that state is set in the press device 40.
　プレス装置４０は、圧子４１および受座４２を備える。圧子４１は、下方へ延びる円柱状の凸部４１ａと、凸部４１ａの周囲に設けられたつば部４１ｂとを備える。圧子４１の凸部４１ａの下面４１ｃは平坦面である。受座４２は、上方へ延びる円柱状の凸部４２ａと、凸部４２ａの周囲に設けられたつば部４２ｂとを備える。受座４２の凸部４２ａの上面４２ｃは平坦面であり、受座４２の凸部４２ａの上面４２ｃにはゴム３０が載置されている。 The pressing device 40 includes an indenter 41 and a seat 42. The indenter 41 includes a columnar convex portion 41a extending downward, and a collar portion 41b provided around the convex portion 41a. The lower surface 41c of the convex portion 41a of the indenter 41 is a flat surface. The receiving seat 42 includes a columnar convex portion 42a extending upward and a flange portion 42b provided around the convex portion 42a. The upper surface 42c of the convex portion 42a of the receiving seat 42 is a flat surface, and the rubber 30 is placed on the upper surface 42c of the convex portion 42a of the receiving seat 42.
　ゴム３０は、アルミパイプ２０に挿入可能な径の円柱形状である。ゴム３０の長さは、接合部近傍においてアルミパイプ２０を変形できる程度の長さであればよい。使用するゴム３０の種類は特に限定されず、例えば、ウレタンゴム、クロロプレンゴム、ＣＮＲゴム（クロロプレンゴム＋ニトリルゴム）、またはシリコンゴム等を使用できる。 The rubber 30 has a cylindrical shape with a diameter that can be inserted into the aluminum pipe 20. The length of the rubber 30 may be a length that can deform the aluminum pipe 20 in the vicinity of the joint. The type of rubber 30 to be used is not particularly limited, and for example, urethane rubber, chloroprene rubber, CNR rubber (chloroprene rubber + nitrile rubber), silicon rubber, or the like can be used.
　次に、図２Ｃに示すように、ゴム３０は、圧子４１の凸部４１ａの下面４１ｃと、受座４２の凸部４２ａの上面４２ｃとによって挟まれ、軸線Ｌ方向に圧縮される。ゴム３０は軸線Ｌ方向の寸法が小さくなるにつれて、径方向の寸法が拡大する。このようにゴム３０を軸線Ｌから径方向外側に向けて膨張するように弾性変形させ、アルミパイプ２０を拡大変形させて鋼製部品１０と圧接する。 Next, as shown in FIG. 2C, the rubber 30 is sandwiched between the lower surface 41c of the convex portion 41a of the indenter 41 and the upper surface 42c of the convex portion 42a of the seat 42, and is compressed in the direction of the axis L. As the size of the rubber 30 in the direction of the axis L decreases, the size in the radial direction increases. In this manner, the rubber 30 is elastically deformed so as to expand from the axis L toward the radially outer side, and the aluminum pipe 20 is expanded and deformed so as to be in pressure contact with the steel part 10.
　接合後、図２Ｄのように、プレス装置４０の圧縮力が除去されたゴム３０は、自身の弾性力により元の形状に復元する。従って、ゴム３０をアルミパイプ２０から容易に取り除くことができる。 After joining, as shown in FIG. 2D, the rubber 30 from which the compressive force of the press device 40 has been removed is restored to its original shape by its own elastic force. Therefore, the rubber 30 can be easily removed from the aluminum pipe 20.
　ここで、図３を参照して、前述の部材の加工方法および接合方法に適したアルミパイプ２０の形状を詳細に説明する。アルミパイプ２０の断面形状は図では概ね台形であるが、その他の多角形の形状であってもよい。アルミパイプ２０には、内周面２１ａにＲ部２２ａ～２２ｄを有する角部２３ａ～２３ｄが設けられている。角部２３ａ～２３ｄの内周面２１ａにおける角度θは、例えば４５～１３５度の範囲内である。角部２３ａ～２３ｄのうち、例えば１つの角部２３ａの内周面２１ａのＲ部２２ａの形状は、以下の式（３）によって規定されている。なお、本実施形態では他の角部２３ｂ～２３ｄの形状も同様に規定されている。 Here, the shape of the aluminum pipe 20 suitable for the above-described member processing method and joining method will be described in detail with reference to FIG. The cross-sectional shape of the aluminum pipe 20 is generally trapezoidal in the drawing, but may be other polygonal shapes. The aluminum pipe 20 is provided with corner portions 23a to 23d having R portions 22a to 22d on the inner peripheral surface 21a. The angle θ of the corner portions 23a to 23d on the inner peripheral surface 21a is, for example, in the range of 45 to 135 degrees. Of the corner portions 23a to 23d, for example, the shape of the R portion 22a of the inner peripheral surface 21a of one corner portion 23a is defined by the following equation (3). In the present embodiment, the shapes of the other corners 23b to 23d are similarly defined.
Figure JPOXMLDOC01-appb-M000005
θ：アルミパイプの角部の内周面における角度
Ｒｃ：アルミパイプの角部の内周面のＲ部の半径
Ｌ１：アルミパイプの角部を構成する２つの辺部のうち一方の辺部の直線長さ
Ｌ２：アルミパイプの角部を構成する２つの辺部のうち他方の辺部の直線長さ
ｎ：アルミパイプの材料のｎ値（加工硬化指数）
Figure JPOXMLDOC01-appb-M000005
θ: angle R c at the inner peripheral surface of the corner of the aluminum pipe R c : radius L 1 of the inner peripheral surface of the corner of the aluminum pipe L 1 : one side of two sides constituting the corner of the aluminum pipe Straight line length L 2 : Straight line length of the other side of two sides constituting the corner of the aluminum pipe n: n value of material of the aluminum pipe (work hardening index)
　ここで、上記の式（３）中のａｖｅ（Ｌ１，Ｌ２）は、Ｌ１とＬ２の平均値を示し、以降単にＬという場合がある。 Here, ave (L 1 , L 2 ) in the above formula (3) indicates an average value of L 1 and L 2 , and may be simply referred to as L hereinafter.
　このように、アルミパイプ２０には角部２３ａが設けられているため、断面形状が円形の場合と比べ、部材１０，２０が回転し難く、ねじり強度を向上できる。ただし、角部２３ａの内周面２１ａのＲ部２２ａの半径Ｒｃが著しく大きい場合、角部２３ａの外周面２１ｂの形状も丸みを帯び、ねじられた際の角部２３ａでの引掛かり量が小さくなり、ねじり強度向上の効果も小さくなり易い。そのため、上記の式（３）のようにＲｃ／Ｌをｔａｎ(θ／２)／４よりも小さく規定し、角形状を維持して一定以上の引掛かり量を確保している。 Thus, since the corner part 23a is provided in the aluminum pipe 20, compared with the case where a cross-sectional shape is circular, the members 10 and 20 are hard to rotate and torsional strength can be improved. However, when the radius R c of R portions 22a of the inner peripheral surface 21a of the corner portion 23a is considerably larger, even rounded shape of the outer peripheral surface 21b of the corner portion 23a, the amount borrowed hook at the corner portion 23a at the time of twisted And the effect of improving torsional strength tends to be small. Therefore, R c / L is defined to be smaller than tan (θ / 2) / 4 as in the above formula (3), and the catching amount of a certain level or more is ensured while maintaining the square shape.
　また、アルミパイプ２０に角部２３ａが設けられている場合、拡大変形の際に角部２３ａに変形力が集中して割れるおそれがある。特に角部２３ａが直角または小半径の丸角の場合、変形力が角部２３ａに集中し易く、十分に拡大変形する前に角部２３ａが割れることがある。これに対し、上記の式（３）のように、Ｒｃ／Ｌをｔａｎ(θ／２)／（（１８×ｎ／２）＋２）よりも大きく規定することで角部２３ａの内周面２１ａが一定以上の丸みを有し、角部２３ａの剛性が低下して角部２３ａの拡大変形が容易となる。従って、角部２３ａの割れを抑制できると共にアルミパイプ２０を十分に拡大変形できる。 Moreover, when the corner part 23a is provided in the aluminum pipe 20, there exists a possibility that a deformation | transformation force may concentrate on the corner part 23a at the time of expansion deformation, and it may crack. In particular, when the corner portion 23a is a right angle or a round corner with a small radius, the deformation force tends to concentrate on the corner portion 23a, and the corner portion 23a may be broken before it is sufficiently expanded and deformed. On the other hand, by defining R c / L to be larger than tan (θ / 2) / ((18 × n / 2) +2) as in the above equation (3), the inner peripheral surface of the corner portion 23a. 21a has a roundness of a certain level or more, the rigidity of the corner 23a is lowered, and the enlarged deformation of the corner 23a is facilitated. Therefore, the crack of the corner 23a can be suppressed and the aluminum pipe 20 can be sufficiently enlarged and deformed.
　詳細には、上記の式（３）は、以下の２つの条件式（４），（５）から導出される。 Specifically, the above expression (3) is derived from the following two conditional expressions (4) and (5).
Figure JPOXMLDOC01-appb-M000006
ｃ：アルミパイプの角部を構成する２つの辺部におけるＲ部の直線長さ
ｂ１：アルミパイプの角部を構成する２つの辺部のうち一方の辺部の直線部の長さ
ｂ２：アルミパイプの角部を構成する２つの辺部のうち他方の辺部の直線部の長さ
Figure JPOXMLDOC01-appb-M000006
c: Straight line length b 1 of the R part in the two sides constituting the corner of the aluminum pipe b 1 : Length b 2 of the straight part of one of the two sides constituting the corner of the aluminum pipe : The length of the straight portion of the other side of the two sides constituting the corner of the aluminum pipe
Figure JPOXMLDOC01-appb-M000007
Figure JPOXMLDOC01-appb-M000007
　上記の式（４）は、アルミパイプ２０の角部２３ａの角形状を保つための条件式である。ここで、上記の式（４）中のａｖｅ（ｂ１，ｂ２）は、ｂ１とｂ２の平均値を示し、以降単にｂという場合がある。具体的には、角部２３ａの長さｃよりも直線部２４ａ，２４ｂの長さｂ１，ｂ２の平均値ｂの半長ｂ／２を長くすることで、即ち角部２３ａに対して所定以上の長さの直線部を設けることで、断面形状が概略円形となることを防止し、角形状を維持している。 The above expression (4) is a conditional expression for maintaining the square shape of the corner 23a of the aluminum pipe 20. Here, ave (b 1 , b 2 ) in the above formula (4) indicates an average value of b 1 and b 2 , and may be simply referred to as b hereinafter. Specifically, by making the half length b / 2 of the average value b of the lengths b1 and b2 of the straight portions 24a and 24b longer than the length c of the corner portion 23a, that is, more than a predetermined amount with respect to the corner portion 23a. By providing a straight portion having a length of λ, the cross-sectional shape is prevented from being substantially circular, and the square shape is maintained.
　上記の式（５）は、解析と実験により導かれた条件式である。後述する解析結果と実験結果に基づいて、式（５）の条件を満たすとき、アルミパイプ２０の割れの発生を抑制できる。 The above expression (5) is a conditional expression derived by analysis and experiment. Based on the analysis results and experimental results described later, the occurrence of cracks in the aluminum pipe 20 can be suppressed when the condition of Expression (5) is satisfied.
　上記の式（４），（５）から、以下の式（６）が導かれる。 The following equation (6) is derived from the above equations (4) and (5).
Figure JPOXMLDOC01-appb-M000008
Figure JPOXMLDOC01-appb-M000008
　また、図３に示すように角部２３ａの幾何学的形状から、以下の２つの式（７）が導かれる。 Further, as shown in FIG. 3, the following two expressions (7) are derived from the geometric shape of the corner 23a.
Figure JPOXMLDOC01-appb-M000009
Figure JPOXMLDOC01-appb-M000009
　上記の式（６），（７）から以下の式（８）が導かれ、式（８）を変形すると上記の式（３）となる。 The following equation (8) is derived from the above equations (6) and (7), and when the equation (8) is transformed, the above equation (3) is obtained.
Figure JPOXMLDOC01-appb-M000010
Figure JPOXMLDOC01-appb-M000010
　従って、上記の式（３）で規定される角部２３ａの内周面２１ａのＲ部２２ａの形状は、角形状を保つ条件式（４）および割れの発生を抑制できる条件式（５）の両方を満たしている。 Therefore, the shape of the R portion 22a of the inner peripheral surface 21a of the corner portion 23a defined by the above formula (3) is the conditional formula (4) for maintaining the square shape and the conditional formula (5) that can suppress the occurrence of cracks. Satisfy both.
　ここで、上記の式（３）について、解析と実験の結果をふまえて詳細に説明する。本実施形態では、アルミパイプ２０の材料はアルミであり、そのｎ値は０．２である。さらに、例えば角度θを９０度としてＬ１とＬ２が等しい正方形断面（Ｌ１，Ｌ２を以降Ｌということがある）を考えると、式（３）は以下の式（９）のように、Ｒｃ／Ｌの範囲として表すことができる。 Here, the above formula (3) will be described in detail based on the results of analysis and experiment. In this embodiment, the material of the aluminum pipe 20 is aluminum, and the n value is 0.2. Further, for example, when considering a square cross section in which L 1 and L 2 are equal when the angle θ is 90 degrees (L 1 and L 2 may be referred to as L hereinafter), the expression (3) is expressed as the following expression (9): , R c / L.
Figure JPOXMLDOC01-appb-M000011
Figure JPOXMLDOC01-appb-M000011
　図４Ａは、アルミパイプ２０について、角度θ＝９０度、Ｌ１＝Ｌ２、直径８０ｍｍ、および半径Ｒｃ＝１０ｍｍの条件で解析を行って得られた拡管量とひずみの関係を示したグラフである。グラフ中の上側のライン（角部ひずみ）は、角部２３ａのみが変形すると仮定した場合の解析結果である。即ち、角部ひずみは、角部の長さｃの変化量をΔｃとして、Δｃ／ｃと表せる。グラフ中の下側のライン（直線部ひずみ）は、直線部２４ａのみが変形すると仮定した場合の解析結果である。即ち、直線部ひずみは、直線部の長さの半長ｂ／２の変化量をΔｂとして、Δｂ／（ｂ／２）と表せる。図４Ａに示すように、角部ひずみは直線部ひずみに比べて大きく、直線部ひずみに対する角部ひずみの比（ひずみ比）が一定以上となった場合、アルミパイプ２０に割れが発生する。なお、ひずみ比は、（Δｃ／ｃ）／（Δｂ／（ｂ／２））と表すことができ、これを近似して概ねｂ／２ｃと表せる。 FIG. 4A is a graph showing the relationship between the expansion amount and strain obtained by analyzing the aluminum pipe 20 under the conditions of an angle θ = 90 degrees, L 1 = L 2 , a diameter of 80 mm, and a radius R c = 10 mm. It is. The upper line (corner distortion) in the graph is an analysis result when it is assumed that only the corner 23a is deformed. That is, the corner distortion can be expressed as Δc / c, where Δc is the amount of change in the length c of the corner. The lower line (straight line portion strain) in the graph is an analysis result when it is assumed that only the straight portion 24a is deformed. That is, the straight portion distortion can be expressed as Δb / (b / 2), where Δb is the amount of change in the half length b / 2 of the length of the straight portion. As shown in FIG. 4A, the corner strain is larger than the straight portion strain, and when the ratio of the corner portion strain to the straight portion strain (strain ratio) becomes a certain level or more, the aluminum pipe 20 cracks. The strain ratio can be expressed as (Δc / c) / (Δb / (b / 2)), which can be approximated as b / 2c.
　図４Ｂは、アルミパイプ２０が、角度θ＝９０度、Ｌ１＝Ｌ２、および直径８０ｍｍの条件で解析を行って得られた、半径Ｒｃを変化させた場合のＲｃ／Ｌと、図４Ａの直線部ひずみに対する角部ひずみの比（ひずみ比）との関係を示すグラフである。グラフ中の破線部は上記の式（９）の条件から外れる部分を示し、実線部分は上記の式（９）の条件に合致する部分を示している。即ち、グラフ中の実線部分が接合に好ましい範囲である。 FIG. 4B shows R c / L obtained when the aluminum pipe 20 is analyzed under the conditions of an angle θ = 90 degrees, L 1 = L 2 , and a diameter of 80 mm, and the radius R c is changed. It is a graph which shows the relationship with the ratio (strain ratio) of the corner | angular part distortion with respect to the linear part distortion of FIG. 4A. A broken line portion in the graph indicates a portion that deviates from the condition of the above equation (9), and a solid line portion indicates a portion that satisfies the condition of the above equation (9). That is, the solid line portion in the graph is a preferable range for joining.
　図４Ｂのグラフの実線の範囲内が有効であることを実験的に確認すべく、角度θ＝９０度、Ｌ１＝Ｌ２、直径８０ｍｍ、および厚み２．０ｍｍのアルミパイプ２０について、角部２３ａの半径Ｒｃを様々に変えて１０％（＝８ｍｍ）拡管し、割れの有無を検証した。その実験結果を以下の表１に示している。 In order to experimentally confirm that the range of the solid line in the graph of FIG. 4B is effective, for the aluminum pipe 20 having an angle θ = 90 degrees, L 1 = L 2 , a diameter of 80 mm, and a thickness of 2.0 mm, variously varied 10% radius R c of 23a (= 8 mm) and tube expansion were verified the presence or absence of cracks. The experimental results are shown in Table 1 below.
Figure JPOXMLDOC01-appb-T000012
Figure JPOXMLDOC01-appb-T000012
　表１に示すように、Ｒｃ／Ｌが１／２０（＝０．０５）以下の値である０，０．０１２５，０．０３７５のときは割れが発生しており、Ｒｃ／Ｌが０．０５より大きい値である０．０６２５，０．１２５のときは割れが発生していない。ここで、Ｒｃが０のときはＲ部が存在せず、角部２３ａの内周面２１ａが直角となっていることを示す。これにより、Ｒｃ／Ｌが０．０３７５～０．０６２５の間で割れを生じる閾値が存在すると考えられ、本実施形態ではその閾値を０．０５に設定している。この解析結果と実験結果から、Ｒｃ／Ｌが０．０５のときにひずみ比が９であることより、ひずみ比が９以上となるときに割れが発生すると考えられる。そのため、前述のように、ひずみ比がｂ／２ｃで表されることから、接合に好ましいのはひずみ比（ｂ／２ｃ）が９未満のときである（式（５）参照）。ただし、上記の式（５）の右辺では、材料に一般性を持たせるために、材料のｎ値を導入している。なお、Ｒｃ／Ｌが１／４（＝０．２５）以上のとき、角部２３ａの角形状が維持されないという条件は幾何的に導かれるものであるため、Ｒｃ／Ｌが０．２５以上の場合は実験の対象としていない（式（４）参照）。 As shown in Table 1, when R c / L is 0, 0.0125, 0.0375, which is a value of 1/20 (= 0.05) or less, cracking occurs, and R c / L is When the value is 0.0625, 0.125, which is larger than 0.05, no crack is generated. Here, when Rc is 0, it indicates that the R portion does not exist and the inner peripheral surface 21a of the corner portion 23a is a right angle. Accordingly, it is considered that there is a threshold value that causes cracking when R c / L is between 0.0375 and 0.0625. In this embodiment, the threshold value is set to 0.05. From the analysis results and the experimental results, it is considered that cracking occurs when the strain ratio is 9 or more because the strain ratio is 9 when R c / L is 0.05. Therefore, as described above, since the strain ratio is represented by b / 2c, it is preferable for joining when the strain ratio (b / 2c) is less than 9 (see Expression (5)). However, in the right side of the above formula (5), the n value of the material is introduced in order to give the material generality. When R c / L is equal to or greater than ¼ (= 0.25), the condition that the corner shape of the corner 23a is not maintained is derived geometrically, and therefore R c / L is 0.25. The above case is not the subject of the experiment (see formula (4)).
　図４Ｃは、図４Ｂのグラフに角度θが７０，１１０度の場合を加えたグラフを示している。角度θが７０，１１０度の場合も角度θが９０度の場合と同様に、ひずみ比が９以上のときに割れが発生すると考えられ、さらに角部２３ａの角形状を維持するための同様の条件から、以下の２つの式（１０）が導かれる。このようにして、角度θが変更された場合でもＲｃ／Ｌの好ましい範囲を導出可能であり、接合に適したアルミパイプ２０の形状を規定できる。 FIG. 4C shows a graph obtained by adding the case where the angle θ is 70,110 degrees to the graph of FIG. 4B. Similarly to the case where the angle θ is 70 ° and the angle θ is 70 °, cracks are considered to occur when the strain ratio is 9 or more, and the same is required to maintain the angular shape of the corner portion 23a. From the conditions, the following two expressions (10) are derived. In this way, a preferable range of R c / L can be derived even when the angle θ is changed, and the shape of the aluminum pipe 20 suitable for joining can be defined.
Figure JPOXMLDOC01-appb-M000013
Figure JPOXMLDOC01-appb-M000013
　図５に示すように、本実施形態の第１変形例として、アルミパイプ２０の断面形状は、内周面２１ａと外周面２１ｂの断面形状が相似形でなくてもよく、即ちアルミパイプ２０の板厚は一定でなくてもよい。例えば、図５に示すように、４つの角部２３ａ～２３ｄを有する概ね正方形断面であり、角部２３ａ～２３ｄの内周面２１ａにはＲ部２２ａ～２２ｄが設けられ、角部２３ａ～２３ｄの外周面２１ｂにはＲ部が設けられていなくてもよい。 As shown in FIG. 5, as a first modification of the present embodiment, the cross-sectional shape of the aluminum pipe 20 may not be similar to the cross-sectional shapes of the inner peripheral surface 21a and the outer peripheral surface 21b. The plate thickness may not be constant. For example, as shown in FIG. 5, it has a substantially square cross section having four corners 23a to 23d. R portions 22a to 22d are provided on the inner peripheral surface 21a of the corners 23a to 23d, and the corners 23a to 23d are provided. The outer peripheral surface 21b may not have the R portion.
　図６Ａ，６Ｂに示すように、本実施形態の第２変形例として、アルミパイプ２０のうち、拡大変形させない部分（本変形例では端部）の外側に外枠４１ｄ，４２ｄを配置してもよい。外枠４１ｄ，４２ｄは円筒状でアルミパイプ２０の両端部の周囲に配置されている。外枠４１ｄ，４２ｄを配置することで、アルミパイプ２０の両端部の変形を規制し、接合部のみを変形させることができ、使用用途に応じた形状にできる。 As shown in FIGS. 6A and 6B, as a second modified example of the present embodiment, outer frames 41d and 42d may be disposed outside the portion of the aluminum pipe 20 that is not enlarged and deformed (the end in this modified example). Good. The outer frames 41d and 42d are cylindrical and are arranged around both ends of the aluminum pipe 20. By disposing the outer frames 41d and 42d, deformation of both end portions of the aluminum pipe 20 can be restricted, only the joint portion can be deformed, and the shape according to the intended use can be obtained.
　図７Ａ，７Ｂに示すように、本実施形態の第３変形例として、鋼製部品１０の穴部１１の縁にバーリング加工を施してもよい。鋼製部品１０の穴部１１の縁をバーリング加工することで、鋼製部品１０の穴部１１の強度を向上でき、鋼製部品１０の変形を防止できる。また、バーリング加工により鋼製部品１０とアルミパイプ２０の接合面積が増加するため、接合強度を向上できる。 7A and 7B, as a third modification of the present embodiment, burring may be performed on the edge of the hole 11 of the steel part 10. By burring the edge of the hole 11 of the steel part 10, the strength of the hole 11 of the steel part 10 can be improved and the deformation of the steel part 10 can be prevented. Moreover, since the joining area of the steel part 10 and the aluminum pipe 20 is increased by burring, the joining strength can be improved.
　なお、本実施形態の部材の接合方法で使用したアルミパイプ２０を拡大変形する加工方法は、接合とは別に単独で使用されてもよい。即ち、アルミパイプ２０を、鋼製部品１０との接合とは関係なく、ゴム３０により拡大変形させて所望の形状を得ることもできる。 The processing method for enlarging and deforming the aluminum pipe 20 used in the member joining method of the present embodiment may be used independently of the joining. That is, the aluminum pipe 20 can be enlarged and deformed by the rubber 30 regardless of the joining with the steel part 10 to obtain a desired shape.
（第２実施形態）
　図８～９Ｂは、本発明の第２実施形態の部材の接合方法について示している。本実施形態において、第１実施形態と同じ構成要素には同じ符号を付して説明を省略する。 (Second Embodiment)
8 to 9B show a method for joining members according to the second embodiment of the present invention. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
　本実施形態では、アルミパイプ２０は、外形を画定する外壁２５と、外壁２５内の内部空間を仕切る内リブ２６とを備える。内リブ２６は、軸線Ｌ方向から見て十字型に形成され、外壁２５内の内部空間を４つに仕切っている。そのため、アルミパイプ２０は、４つの内周面２１ｃ～２１ｆを備える。 In the present embodiment, the aluminum pipe 20 includes an outer wall 25 that defines an outer shape, and an inner rib 26 that partitions an internal space in the outer wall 25. The inner rib 26 is formed in a cross shape when viewed from the direction of the axis L, and divides the internal space in the outer wall 25 into four. Therefore, the aluminum pipe 20 includes four inner peripheral surfaces 21c to 21f.
　外壁２５と内リブ２６が接続されている４つの交差部２７ａ～２７ｄには、Ｒ部２２ｅ～２２ｌを有する角部２３ｅ～２３ｌがそれぞれ設けられている。角部２３ｅ～２３ｌのうち、例えば１つの角部２３ｅの内周面２１ｃのＲ部２２ｅの形状は、以下の式（１１）によって規定されている。なお、本実施形態では他の角部２３ｆ～２３ｌの形状も同様に規定されている。 The four intersecting portions 27a to 27d to which the outer wall 25 and the inner rib 26 are connected are provided with corner portions 23e to 23l having R portions 22e to 22l, respectively. Of the corner portions 23e to 23l, for example, the shape of the R portion 22e of the inner peripheral surface 21c of one corner portion 23e is defined by the following equation (11). In the present embodiment, the shapes of the other corner portions 23f to 23l are similarly defined.
Figure JPOXMLDOC01-appb-M000014
φ：アルミパイプの交差部の角部の内周面における角度
ｒｃ：アルミパイプの交差部のＲ部の半径
Ｄ１：アルミパイプの交差部の角部を構成する２つの辺部のうち一方の辺部の直線長さ
Ｄ２：アルミパイプの交差部の角部を構成する２つの辺部のうち他方の辺部の直線長さ
ｎ：アルミパイプの材料のｎ値（加工硬化指数）
Figure JPOXMLDOC01-appb-M000014
phi: angle of the inner peripheral surface of the corner of the intersection of the aluminum pipe r c: radius D 1 of the R portion of the intersection of the aluminum pipe: one of the two sides constituting a corner of the intersection of the aluminum pipe Linear length D 2 of the side of the other: Of the two sides constituting the corner of the intersection of the aluminum pipe, the linear length of the other side n: n value of the material of the aluminum pipe (work hardening index)
　ここで、式（１１）のａｖｅ（Ｄ１，Ｄ２）は、Ｄ１とＤ２の平均値を示す。上記の式（１１）は、第１実施形態の式（３）と対応している。従って、式（１１）の導出および意義は、第１実施形態の式（３）と同様である。 Here, ave (D 1 , D 2 ) in the formula (11) indicates an average value of D 1 and D 2 . The above equation (11) corresponds to the equation (3) of the first embodiment. Therefore, the derivation and significance of Expression (11) are the same as Expression (3) of the first embodiment.
　本実施形態では、アルミパイプ２０の外壁２５内の内部空間は内リブ２６で４つに仕切られているため、アルミパイプ２０内に挿入するゴム３０は４つ必要である。即ち、内リブ２６で仕切られた各内部空間に１つずつゴム３０を挿入する。 In this embodiment, since the internal space in the outer wall 25 of the aluminum pipe 20 is partitioned into four by the inner rib 26, four rubbers 30 to be inserted into the aluminum pipe 20 are necessary. That is, one rubber 30 is inserted into each internal space partitioned by the inner rib 26.
　本実施形態の圧子４１の凸部４１ａには内リブ２６に対応した溝部４１ｅが設けられている。そのため、圧子４１の凸部４１ａをアルミパイプ２０内に挿入しても内リブ２６と干渉することなく、ゴム３０を押圧できる。 A groove 41e corresponding to the inner rib 26 is provided on the convex portion 41a of the indenter 41 of the present embodiment. Therefore, even if the convex portion 41a of the indenter 41 is inserted into the aluminum pipe 20, the rubber 30 can be pressed without interfering with the inner rib 26.
　本実施形態によれば、アルミパイプ２０が内リブ２６を備えるため、アルミパイプ２０の剛性を向上できる。また、アルミパイプ２０の交差部２７ａ～２７ｄの角部２３ｅ～２３ｌの形状を式（１０）のように規定することで、交差部２７ａ～２７ｄの割れを抑制できると共に外壁２５および内リブ２６を拡大変形できる。 According to this embodiment, since the aluminum pipe 20 includes the inner rib 26, the rigidity of the aluminum pipe 20 can be improved. Further, by defining the shapes of the corner portions 23e to 23l of the intersecting portions 27a to 27d of the aluminum pipe 20 as shown in the equation (10), the cracks of the intersecting portions 27a to 27d can be suppressed and the outer wall 25 and the inner rib 26 can be formed. Can be enlarged and deformed.
（第３実施形態）
　図１０Ａ～１１Ｄは、本発明の第３実施形態の部材の接合方法について示している。本実施形態において、第１，第２実施形態と同じ構成要素には同じ符号を付して説明を省略する。 (Third embodiment)
10A to 11D show a method for joining members according to the third embodiment of the present invention. In the present embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.
　図１０Ａに示すように、鋼製部品１０はハイテンション鋼からなるチャンネル型の形状である。鋼製部品１０は、底壁１２と、底壁１２から鉛直上方へ延びる２つの側壁１３と、２つの側壁１３からそれぞれ水平方向外側へ延びる上壁１４とを備える。底壁１２には、アルミパイプ２０を挿通可能な穴部１１が設けられている。 As shown in FIG. 10A, the steel part 10 has a channel shape made of high tension steel. The steel part 10 includes a bottom wall 12, two side walls 13 that extend vertically upward from the bottom wall 12, and an upper wall 14 that extends outward from each of the two side walls 13 in the horizontal direction. The bottom wall 12 is provided with a hole 11 through which the aluminum pipe 20 can be inserted.
　図１０Ｂに示すように、アルミパイプ２０は、径方向外側へ拡大変形し、図において上側の端部が押し潰されることで、鋼製部品１０の穴部１１に接合される。このように、アルミパイプ２０を単なる拡管変形させるだけでなく端部を押し潰すことで両部材１０，２０を接合してもよい。 As shown in FIG. 10B, the aluminum pipe 20 expands and deforms radially outward, and is joined to the hole 11 of the steel part 10 by crushing the upper end in the drawing. In this way, the members 10 and 20 may be joined not only by deforming and expanding the aluminum pipe 20 but also by crushing the ends.
　この接合方法を詳細に説明すると、図１１Ａに示すように、鋼製部品１０の穴部１１にアルミパイプ２０を挿通し、アルミパイプ２０の内部にゴム３０を挿入し、プレス装置４０にセットする。ただし、アルミパイプ２０は、内部にゴム３０を挿入された状態で穴部１１に挿通されてもよい。プレス装置４０は、圧子４１および受座４２を備える。圧子４１は平坦な下面４１ｃを有する。受座４２は、平坦な上面４２ｃを有し、上面４２ｃには鋼製部品１０とゴム３０が載置されている。ゴム３０は、アルミパイプ２０に挿入可能な径の円柱形状であり、アルミパイプ２０よりも全長が長いものが使用されている。従って、セットされた状態では、ゴム３０はアルミパイプ２０の上端から部分的に突出している。このため、プレス装置４０がプレスを開始して受座４２と圧子４１が相対的に接近すると、ゴム３０が最初に押圧される。ただし、必ずしもゴム３０はアルミパイプ２０の上端から突出している必要はなく、アルミパイプ２０の上端と面一又は内部に収容されていてもよい。 This joining method will be described in detail. As shown in FIG. 11A, the aluminum pipe 20 is inserted into the hole 11 of the steel part 10, the rubber 30 is inserted into the aluminum pipe 20, and the pressing device 40 is set. . However, the aluminum pipe 20 may be inserted through the hole 11 with the rubber 30 inserted therein. The press device 40 includes an indenter 41 and a receiving seat 42. The indenter 41 has a flat lower surface 41c. The seat 42 has a flat upper surface 42c, and the steel part 10 and the rubber 30 are placed on the upper surface 42c. The rubber 30 has a cylindrical shape with a diameter that can be inserted into the aluminum pipe 20, and has a longer overall length than the aluminum pipe 20. Therefore, in the set state, the rubber 30 partially protrudes from the upper end of the aluminum pipe 20. For this reason, when the press device 40 starts pressing and the seat 42 and the indenter 41 relatively approach each other, the rubber 30 is pressed first. However, the rubber 30 does not necessarily have to protrude from the upper end of the aluminum pipe 20 and may be accommodated in or flush with the upper end of the aluminum pipe 20.
　次に、図１１Ｂに示すように、プレス装置４０によりゴム３０を軸線Ｌ方向に圧縮する。ゴム３０は軸線Ｌ方向の寸法が小さくなるにつれて径方向の寸法が拡大する。このようにゴム３０を軸線Ｌから外側に向けて膨張させ、アルミパイプ２０を拡大変形させる。そして、図１１Ｃに示すように、プレス装置４０によりさらに圧縮することで、アルミパイプ２０をさらに拡大変形させ、同時にアルミパイプ２０の図において上側の端部を鋼製部品１０に向けて折り曲げて押し潰し、鋼製部品１０と接合する。 Next, as shown in FIG. 11B, the rubber 30 is compressed in the direction of the axis L by the press device 40. As the size of the rubber 30 in the direction of the axis L decreases, the size in the radial direction increases. Thus, the rubber 30 is expanded outward from the axis L, and the aluminum pipe 20 is expanded and deformed. Then, as shown in FIG. 11C, the aluminum pipe 20 is further expanded and deformed by further compression by the pressing device 40, and at the same time, the upper end in the drawing of the aluminum pipe 20 is bent toward the steel part 10 and pushed. Crushing and joining with the steel part 10.
　接合後、図１１Ｄに示すように、プレス装置４０の圧縮力が除去されたゴム３０は、自身の弾性力により元の形状に復元する。従って、ゴム３０をアルミパイプ２０から容易に取り除くことができる。 After joining, as shown in FIG. 11D, the rubber 30 from which the compressive force of the press device 40 has been removed is restored to its original shape by its own elastic force. Therefore, the rubber 30 can be easily removed from the aluminum pipe 20.
　本実施形態のように、鋼製部品１０の形状はハット型またはその他形状であってもよく、特に限定されない。また、プレス装置４０の態様を含む接合の態様も特に限定されず、拡管接合または端部を押し潰した接合など様々に可能である。 As in this embodiment, the shape of the steel part 10 may be a hat shape or other shapes, and is not particularly limited. Moreover, the aspect of joining including the aspect of the press apparatus 40 is not specifically limited, It can variously, such as pipe expansion joining or the joining which crushed the edge part.
（第４実施形態）
　図１２Ａ，１２Ｂは、本発明の第４実施形態の部材の接合方法について示している。本実施形態において、第１～第３実施形態と同じ構成要素には同じ符号を付して説明を省略する。 (Fourth embodiment)
12A and 12B show a method for joining members according to the fourth embodiment of the present invention. In the present embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.
　図１２Ａに示すように、本実施形態では、型枠４３を使用して鋼製部品１０とアルミパイプ２０を接合する。型枠４３は、アルミパイプ２０と同心の円筒状である。型枠４３は、受座４２と鋼製部品１０の間であって、アルミパイプ２０の外側に配置されている。プレス装置４０にセットされた状態では、アルミパイプ２０と型枠４３の間には隙間が設けられている。この状態で、図１２Ｂに示すように、圧子４１により押圧することで、アルミパイプ２０が拡大変形した際に型枠４３の内面形状になじませることができる。 As shown in FIG. 12A, in this embodiment, the steel part 10 and the aluminum pipe 20 are joined using the mold 43. The mold frame 43 has a cylindrical shape concentric with the aluminum pipe 20. The mold 43 is disposed between the seat 42 and the steel part 10 and outside the aluminum pipe 20. When set in the pressing device 40, a gap is provided between the aluminum pipe 20 and the mold frame 43. In this state, as shown in FIG. 12B, by pressing with the indenter 41, the inner shape of the mold 43 can be adjusted when the aluminum pipe 20 is enlarged and deformed.
　この方法によれば、型枠４３の内面形状を様々な多角形状にすることができる。形状については、部品性能の観点などから適宜選択すればよい。例えば、アルミパイプ２０が自動車部品の１つであるバンパーステイである場合、型枠４３の内面に微小な凹凸を付与しておけば、アルミパイプ２０にこの微小な凹凸形状が転写され、衝突時の衝突エネルギーの吸収性能を向上できる。 According to this method, the inner shape of the mold 43 can be changed to various polygonal shapes. The shape may be appropriately selected from the viewpoint of component performance. For example, when the aluminum pipe 20 is a bumper stay which is one of the automobile parts, if a minute unevenness is given to the inner surface of the mold 43, the minute uneven shape is transferred to the aluminum pipe 20, and at the time of collision. The impact energy absorption performance can be improved.
（第５実施形態）
　図１３Ａ，１３Ｂは、本発明の第５実施形態の部材の接合方法について示している。本実施形態において、第１～第４実施形態と同じ構成要素には同じ符号を付して説明を省略する。 (Fifth embodiment)
13A and 13B show a method for joining members according to the fifth embodiment of the present invention. In the present embodiment, the same components as those in the first to fourth embodiments are denoted by the same reference numerals and description thereof is omitted.
　図１３Ａ，１３Ｂに示すように、本実施形態では、アルミパイプ２０の周囲に拡大変形を部分的に規制する円筒状の外枠金型４４を配置している。外枠金型４４は、接合部の近傍のみ拡大変形するように、接合部近傍において内径が大きく形成された拡径部４４ａを上端に有する。拡径部４４ａ以外の内径はアルミパイプ２０の外径と概略等しい。 As shown in FIGS. 13A and 13B, in this embodiment, a cylindrical outer frame mold 44 that partially restricts expansion deformation is disposed around the aluminum pipe 20. The outer frame mold 44 has an enlarged diameter portion 44a having a large inner diameter in the vicinity of the joint at the upper end so that only the vicinity of the joint is enlarged and deformed. The inner diameter other than the enlarged diameter portion 44a is approximately equal to the outer diameter of the aluminum pipe 20.
　外枠金型４４を使用すると、アルミパイプ２０の接合部近傍のみが拡大変形するように拡大変形領域を高精度に制御できる。ここで拡大変形領域とは、アルミパイプ２０が外側に向かって拡大変形した領域をいう。 When the outer frame mold 44 is used, the enlarged deformation region can be controlled with high accuracy so that only the vicinity of the joint portion of the aluminum pipe 20 is enlarged and deformed. Here, the enlarged deformation region refers to a region in which the aluminum pipe 20 is enlarged and deformed outward.
　図１４Ａに示すように、プレス装置４０が備える圧子４１は図において下向きに先細り形状の円錐台形状であってもよい。鋼製部品１０の図において上側に突出したアルミパイプ２０の端部の拡大変形には、高い成形力が必要となる場合がある。そのような場合には、圧子４１により直接的にアルミパイプ２０を変形できる圧子４１の形状が有効である。 As shown in FIG. 14A, the indenter 41 provided in the press device 40 may have a truncated cone shape that is tapered downward in the drawing. A high forming force may be required for the enlarged deformation of the end of the aluminum pipe 20 protruding upward in the drawing of the steel part 10. In such a case, the shape of the indenter 41 that can directly deform the aluminum pipe 20 by the indenter 41 is effective.
　図１４Ｂに示すように、成形の終期に、鋼製部品１０の上側に突出したアルミパイプ２０の図において上側の端部がゴム３０を介することなく圧子４１により直接外側へ押し拡げられ、さらには鋼製部品１０へ向かって折り曲げられる。これにより、より強固に接合できる。また、ゴム３０に過度の負荷が作用しないのでゴム３０の耐久性が向上する。 As shown in FIG. 14B, at the final stage of molding, the upper end of the aluminum pipe 20 protruding upward from the steel part 10 is directly pushed outward by the indenter 41 without the rubber 30 interposed therebetween. It is bent towards the steel part 10. Thereby, it can join more firmly. Further, since an excessive load does not act on the rubber 30, the durability of the rubber 30 is improved.
　以上より、本発明の具体的な実施形態およびその変形例について説明したが、本発明は上記形態に限定されるものではなく、この発明の範囲内で種々変更して実施することができる。例えば、個々の実施形態の内容を適宜組み合わせたものを、この発明の一実施形態としてもよい。 As described above, specific embodiments of the present invention and modifications thereof have been described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, what combined suitably the content of each embodiment is good also as one Embodiment of this invention.
　　１　組立体
　　１０　鋼製部品（第２部材）
　　１１　穴部
　　１２　底壁
　　１３　側壁
　　１４　上壁　
　　２０　アルミパイプ（第１部材）
　　２１ａ，２１ｃ～２１ｆ　内周面
　　２１ｂ　外周面
　　２２ａ～２２ｌ　Ｒ部
　　２３ａ～２３ｌ　角部
　　２４ａ～２４ｄ　直線部
　　２５　外壁
　　２６　内リブ
　　２７ａ～２７ｄ　交差部
　　３０　ゴム（弾性体）
　　４０　プレス装置
　　４１　圧子
　　４１ａ　凸部
　　４１ｂ　つば部
　　４１ｃ　下面
　　４１ｄ　外枠
　　４１ｅ　溝部
　　４２　受座
　　４２ａ　凸部
　　４２ｂ　つば部
　　４２ｃ　上面
　　４２ｄ　外枠
　　４３　型枠
　　４４　外枠金型
　　４４ａ　拡径部 1 Assembly 10 Steel parts (second member)
11 hole 12 bottom wall 13 side wall 14 upper wall
20 Aluminum pipe (first member)
21a, 21c to 21f Inner peripheral surface 21b Outer peripheral surface 22a to 22l R portion 23a to 23l Corner portion 24a to 24d Linear portion 25 Outer wall 26 Inner rib 27a to 27d Intersection 30 Rubber (elastic body)
40 Press device 41 Indenter 41a Protruding part 41b Collar part 41c Lower surface 41d Outer frame 41e Groove part 42 Receiving seat 42a Convex part 42b Collar part 42c Upper surface 42d Outer frame 43 Mold frame 44 Outer frame mold 44a Expanding part

Claims (8)

  1. 　軸線方向に延びた中空状であり、前記軸線方向の断面形状の内周面にＲ部を有する角部が設けられ、前記角部の形状が以下の式によって規定されている第１部材と、弾性体とを準備し、
    　前記第１部材の内部に前記弾性体を挿入し、
    　前記弾性体を前記軸線方向に圧縮して前記軸線の径方向外側に向けて膨張させ、それによって前記第１部材を拡大変形加工する
    　ことを含む、部材の加工方法。
    Figure JPOXMLDOC01-appb-I000001

    θ：第１部材の角部の内周面における角度
    Ｒｃ：第１部材の角部の内周面のＲ部の半径
    Ｌ１：第１部材の角部を構成する２つの辺部のうち一方の辺部の直線長さ
    Ｌ２：第１部材の角部を構成する２つの辺部のうち他方の辺部の直線長さ
    ｎ：第１部材の材料のｎ値（加工硬化指数）     A hollow member extending in the axial direction, provided with a corner portion having an R portion on the inner circumferential surface of the cross-sectional shape in the axial direction, and the shape of the corner portion is defined by the following formula: Prepare an elastic body,
    Inserting the elastic body into the first member;
    A member processing method, comprising: compressing the elastic body in the axial direction and expanding the elastic body toward a radially outer side of the axis, thereby expanding and deforming the first member.
    Figure JPOXMLDOC01-appb-I000001

    θ: angle R c at the inner peripheral surface of the corner of the first member: radius R 1 of the R portion of the inner peripheral surface of the corner of the first member: out of two sides constituting the corner of the first member Linear length L 2 of one side part: linear length of the other side part of two side parts constituting the corner part of the first member n: n value of material of the first member (work hardening index)
  2. 　前記第１部材とは強度が異なり、穴部が設けられた第２部材をさらに準備し、
    　前記第２部材の前記穴部に前記第１部材を挿通し、
    　請求項１に記載の部材の加工方法を使用して前記第１部材を拡大変形加工して前記第１部材と前記第２部材とを接合する
    　ことを含む、部材の接合方法。     The second member is different in strength from the first member, and further prepares a second member provided with a hole,
    Inserting the first member into the hole of the second member;
    A method for joining members, comprising enlarging and deforming the first member using the member processing method according to claim 1 to join the first member and the second member.
  3. 　前記第１部材は、外形を画定する外壁と、前記外壁内の内部空間を仕切る内リブとを備え、
    　前記外壁と前記内リブが接続されている交差部には、内周面にＲ部を有する角部が設けられ、前記交差部の前記角部の形状が以下の式によって規定されている、請求項２に記載の部材の接合方法。
    Figure JPOXMLDOC01-appb-I000002

    φ：第１部材の交差部の角部の内周面における角度
    ｒｃ：第１部材の交差部の内周面のＲ部の半径
    Ｄ１：第１部材の交差部の角部を構成する２つの辺部のうち一方の辺部の直線長さ
    Ｄ２：第１部材の交差部の角部を構成する２つの辺部のうち一方の辺部の直線長さ
    ｎ：第１部材の材料のｎ値（加工硬化指数）     The first member includes an outer wall that defines an outer shape, and an inner rib that partitions an internal space in the outer wall,
    The intersection where the outer wall and the inner rib are connected is provided with a corner having an R portion on the inner peripheral surface, and the shape of the corner of the intersection is defined by the following formula: Item 3. A method for joining members according to Item 2.
    Figure JPOXMLDOC01-appb-I000002

    φ: angle r c at the inner peripheral surface of the corner of the intersecting portion of the first member: radius D 1 of the R portion of the inner peripheral surface of the intersecting portion of the first member: constituting the corner of the intersecting portion of the first member straight one side portion of the two sides the length D 2: linear length of one side portion of the two sides constituting a corner of the intersection of the first member n: material of first member N value (work hardening index)
  4. 　前記第２部材の前記穴部の形状と前記第１部材の前記穴部に挿通される部分の断面形状は相似形である、請求項２または請求項３に記載の部材の接合方法。 The member joining method according to claim 2 or 3, wherein the shape of the hole portion of the second member and the cross-sectional shape of the portion inserted through the hole portion of the first member are similar.
  5. 　前記弾性体を圧縮する際、前記第１部材も前記軸線方向に圧縮する、請求項２または請求項３に記載の部材の接合方法。 The member joining method according to claim 2 or 3, wherein when compressing the elastic body, the first member is also compressed in the axial direction.
  6. 　前記第２部材の前記穴部の縁はバーリング加工されている、請求項２または請求項３に記載の部材の接合方法。 The member joining method according to claim 2 or 3, wherein an edge of the hole portion of the second member is burring processed.
  7. 　前記第１部材の外側に型枠を配置し、前記第１部材の少なくとも一部を前記型枠に沿うように成形して接合する、請求項２または請求項３に記載の部材の接合方法。 The member joining method according to claim 2 or 3, wherein a mold is disposed outside the first member, and at least a part of the first member is molded and joined along the mold.
  8. 　前記第１部材の外側に外枠金型を配置し、前記外枠金型により前記第１部材の拡大変形を部分的に制限して接合する、請求項２または請求項３に記載の部材の接合方法。 4. The member according to claim 2, wherein an outer frame mold is disposed outside the first member, and the expansion deformation of the first member is partially limited by the outer frame mold to be joined. 5. Joining method.
PCT/JP2017/026469 2016-08-02 2017-07-21 Member machining method and member joining method WO2018025666A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021058926A (en) * 2019-10-09 2021-04-15 株式会社神戸製鋼所 Member joint method
US11433450B2 (en) * 2018-01-11 2022-09-06 Kobe Steel, Ltd. Joined body and method for manufacturing same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51133170A (en) * 1975-05-16 1976-11-18 Nikkei Aluminium Sales Method of connecting pipe body and wall surface body with through hole
JP2007296569A (en) * 2006-05-02 2007-11-15 Showa Denko Kk Method for joining pipe and plate
JP2010051975A (en) * 2008-08-26 2010-03-11 Showa Denko Kk Method of joining pipe and member to be joined

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51133170A (en) * 1975-05-16 1976-11-18 Nikkei Aluminium Sales Method of connecting pipe body and wall surface body with through hole
JP2007296569A (en) * 2006-05-02 2007-11-15 Showa Denko Kk Method for joining pipe and plate
JP2010051975A (en) * 2008-08-26 2010-03-11 Showa Denko Kk Method of joining pipe and member to be joined

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11433450B2 (en) * 2018-01-11 2022-09-06 Kobe Steel, Ltd. Joined body and method for manufacturing same
JP2021058926A (en) * 2019-10-09 2021-04-15 株式会社神戸製鋼所 Member joint method
WO2021070571A1 (en) * 2019-10-09 2021-04-15 株式会社神戸製鋼所 Method for joining members

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