JP4138360B2 - Structure with joint structure for friction stir welding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure including a joint structure for friction stir welding.
[0002]
[Prior art]
For example, Japanese Patent Laid-Open No. 10-230376 discloses joining of metal members by friction stir welding. This technique, of the ends of the two metal plates, provided with a bent portion in parallel form in the thickness direction at one of the joint ends, overlapping the ends of both the metal plate. And a rotary tool is inserted from the bending part side, and friction stir welding is performed.
[0003]
[Problems to be solved by the invention]
However, in the friction stir welded portion described above, the lower surface of the bent portion of one plate member and the upper surface of the other plate member become the joint surface, so that when tensile stress is applied to both plate members after joining, There was a problem that the rotational moment was generated and the strength decreased.
[0004]
This invention provides the structure provided with the joint structure for friction stir welding which eliminates the malfunction mentioned above.
[0005]
[Means for Solving the Problems]
The object is to provide a first hollow member comprising a first plate-like member, a second plate-like member substantially parallel to the first plate-like member, and a first connection plate for connecting both, and a third A second hollow member comprising a plate-like member, a fourth plate-like member substantially parallel to the third plate-like member, and a second connecting plate for connecting the two, and the first hollow member. A joining plate connected to an end of the second plate member and an end of the fourth plate member of the second hollow member, and an end of the first plate member of the first hollow member The portion protrudes toward the second hollow shape side from the end portion of the second plate-shaped member of the first hollow shape material, and the end portion of the third plate-shaped member of the second hollow shape material is The end of the fourth plate member of the second hollow member protrudes toward the first hollow member, and the end of the first plate member of the first hollow member is the second hollow. The end of the third plate-shaped member of the profile And a first joint portion is formed at a connection portion between the second plate-like member of the first hollow shape member and the first connection plate, and the second hollow shape member is A second joint portion is formed at a connection portion between the four plate-like members and the second connection plate, and the joint plate is connected to the third joint portion and the second joint at both ends of the plate-like portion forming the joint plate. 4 joint parts, the 3rd joint part of the above-mentioned joining plate is piled up on the 1st joint part of the above-mentioned 1st hollow shape material in the thickness direction of the above-mentioned joining board, and the above-mentioned 2nd hollow form A fourth joint portion of the joining plate is superposed on a second joint portion of the material in a thickness direction of the joining plate, and an overlapping portion of the first joint portion and the third joint portion and the second joint Friction stir by inserting a friction stir welding rotary tool from the direction perpendicular to the overlapped portion of the overlapped portion and the fourth joint portion The first joint portion of the first hollow shape member and the third joint portion of the joining plate, and the second joint portion of the second hollow shape member and the fourth of the joining plate. The joint surface with the joint portion includes the first joint portion of the first hollow shape member and the second joint portion of the second hollow shape member, the second plate-like member of the first hollow shape member, and the second hollow shape. The fourth plate-like member of the material is formed to be recessed to half the plate thickness, and the plate-like portion between the third joint portion and the fourth joint portion is the first plate-like member. And the third plate-like member are recessed toward the joint portion side, and the recess is formed to have a dimension that is half the thickness of the plate-like portion of the joint plate. a second plate member having a thickness of the center line C ₁ and the second hollow shape member of the fourth plate member having a thickness of the center line C ₂ and the joining plate of the plate on the center line extended line of C ₃ thickness Located Rukoto, by it can be achieved.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a sectional view showing a joint structure for friction stir welding according to a first embodiment of the present invention. The joint structure denoted as a whole by reference numeral 1 is formed by a joining end portion of a first plate member 10 made of metal and a second plate member 20 made of metal. Both members 10 and 20 extend in a direction perpendicular to the paper surface.
[0007]
The first member 10 and the second member 20 are plate-like members having thickness dimensions T ₁ and T ₂ . And the edge part of the 1st member 10 and the edge part of the 2nd member 20 are bent by the step shape, and the joint parts 12 and 22 are formed. The step height of the joint portions 12 and 22 is set to a half of the plate thicknesses T ₁ and T ₂ . The joint portions 12 and 22 are portions that perform lap friction stir welding. That is, the bonding surfaces _{S 1} overlaid is located on an extension of the plate thickness _T 1, the center line _C 1 of _{T 2, C 2.}
[0008]
The second joint portion 22 is formed by being bent to the opposite side of the first member 10 from the first joint portion 12.
[0009]
On the upper surface side of the end portion of the first member 10 in the plate thickness direction, there is a protrusion 14 protruding in the thickness direction. Projection 14 is formed over the entire length of the first member 10, the width dimension is set to be larger than the diameter D ₁ of the large diameter portion of the friction stir welding tool. The large-diameter portion of the rotary tool 50 is slightly inserted into the protrusion 14.
[0010]
The friction stir welding rotary tool 50 is press-fitted into the joint portions 12 and 22 from the outside of the first joint portion 12 of the first member 10 and moved relative to the first member 10 in a direction perpendicular to the paper surface. Friction stir welding is performed with the second member 20.
[0011]
In this state, the first member 10 and the second member 20 are fixed on the table, and the friction stir welding is performed by inserting the friction stir welding rotary tool 50 from the protrusion 14 side of the first member.
[0012]
At this time, the small diameter portion of the tip of the friction stir welding rotary tool 50 has a diameter D _2, although the screw portion is formed, the small diameter portion tip of the second member 20 second It is inserted into the upper surface of the joint part 22 (inserted slightly above the lower surface 24 of the second joint part 22). The large diameter portion having the diameter dimension D ₁ of the tool 50 is press-fitted into the protrusion 14 of the first joint portion 12.
[0013]
When the joint structure 1 joined as described above is subjected to a tensile load in the horizontal direction indicated by the arrow P <b> 1, the joint surface S <b> 1 of the joint structure ₁ is the thickness center line of the first member 10. Since C ₁ and the thickness center line C ₂ of the second member 20 are in the same plane, no rotational moment is generated on the joint surface.
[0014]
Therefore, peeling is unlikely to occur and a joint structure with high strength can be obtained.
[0015]
FIG. 2 is a cross-sectional view of the joint structure according to the second embodiment of the present invention. The first hollow shape member 110 (first hollow shape member), the first and second plate-like member 111 which is parallel to (first plate member), and 112 (second plate member), And a third plate-like member 113 (first connection plate) connecting the both .
[0016]
The second hollow shape member 120 (second hollow shape member) includes first and second plate-like members 121 (third plate-like member) and 122 (fourth plate-like member) formed in parallel. And a third plate-like member 123 (second connection plate) connecting the both .
[0017]
The end portion of the first member 111 of the first hollow shape member 110 protrudes closer to the second hollow shape member 120 than the end portion of the second member 112, and the first hollow shape member 120 has the first end portion. It is abutted against the end of the member 121. The end of the first member 121 of the second hollow profile 120 protrudes toward the first hollow profile 110 from the end of the second member 122, and the first hollow profile 110 has a first end. It is abutted against the end of the member 111. Butt portion constitutes a joint portion _{S 3} by friction stir welding from the second member 112 and 122 side.
[0018]
It has the 1st joint part 114 (1st joint part) dented in the connection part of the 2nd member 112 of the 1st hollow shape member 110, and the 3rd member 113. FIG. The second hollow shape member 120 has a second joint portion 124 (second joint portion) that is recessed in the connection portion between the second member 122 and the third member 123 .
[0019]
Upper surfaces (overlapping surfaces and joint surfaces) of the first and second joint portions 114 and 124 are formed on the extension of the center lines C ₁ and C ₂ of the plate thickness of the plate-like second member 112.
[0020]
The first joint part 114 and the second joint part 124 are separated from each other with an opening therebetween, and a third member 130 (joining plate) covering the opening is placed between the joint parts 114 and 124. The first joint structure 101 and the second joint structure 102 are formed by friction stir welding.
[0021]
The third member 130 is a plate-like member, and stepped first and second joint parts 132 (third joint part) and 136 (fourth joint part) are formed at both ends. Level difference of the first and second joint portions 132 and 136 is set to half the dimensions of _{T 3} the plate thickness of the plate-like portion 131. The plate-like portion 131 between the first and second joint portions 132 and 136 at both ends is recessed. That is, the superposed surfaces of the joint portions 132 and 136 (bonding surface) is positioned on the extension of the center line _{C 3} and _C 1 _C 1, _{C 2} of the plate thickness _{T 3.}
[0022]
Projections 134 and 138 are provided on the upper surfaces of the first and second joint portions 132 and 136.
[0023]
After the first members 111 and 121 are joined by friction stir welding, the third member 130 is placed on the first and second joint portions 114 and 124, and the friction stir welding rotary tool 50 is moved to the first. The first joint structure 101 is formed by press-fitting into the first joint part 132 and subjecting the first joint part to friction stir welding.
[0024]
Similarly, friction stir welding is performed on the second joint portion 136 to form the second joint structure 102 .
[0025]
Since this joint structure is formed as described above, the joint surface S1 of the _first hollow member 110 and the third member 130 forms the same plane as the plate thickness center line of both members. Therefore, it has high strength against the tensile load in the horizontal direction. Similarly junction surface S ₂ of the second hollow shape member 120 and third member 130 also the thickness center line flush with both members to form, with respect to the tensile stress, with high strength.
[0026]
【The invention's effect】
As described above, the present invention forms a joining surface by overlapping two members, inserts a rotary tool for friction stir welding from a direction perpendicular to the joining surface, and friction stir welds the joining surface. When the joint structure is formed, the joint portion of each member is processed so that the joint surface is the same plane as the plate thickness center line of the two members.
[0027]
Therefore, even when a tensile stress parallel to the joint surface is applied to the joint structure, no rotational moment is generated on the joint surface. Therefore, a joint structure with high strength can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.
FIG. 2 is a sectional view showing a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Friction stir welding joint structure 10 1st member 12 1st joint part 14 Protrusion 20 2nd member 22 2nd joint part 50 Rotary tool for friction stir welding

Claims (1)

A first hollow member comprising a first plate member, a second plate member substantially parallel to the first plate member, and a first connection plate connecting the two,
A second hollow member comprising a third plate member, a fourth plate member substantially parallel to the third plate member, and a second connection plate for connecting both,
A joining plate connected to an end of the second plate-shaped member of the first hollow profile and an end of the fourth plate-shaped member of the second hollow profile;
The end of the first plate member of the first hollow member protrudes toward the second hollow member from the end of the second plate member of the first hollow member. The end of the third plate-shaped member of the hollow profile protrudes toward the first hollow profile from the end of the fourth plate-shaped member of the second hollow profile,
An end portion of the first plate-shaped member of the first hollow shape member is butted and joined to an end portion of the third plate-shaped member of the second hollow shape material;
A first joint portion is formed at a connection portion between the second plate-shaped member of the first hollow profile and the first connection plate, and the fourth plate-shaped member of the second hollow profile and the second A second joint portion is formed at the connection portion with the connection plate,
The joining plate includes a third joint portion and a fourth joint portion at both ends of the plate-like portion forming the joining plate,
The third joint portion of the joining plate is overlapped with the first joint portion of the first hollow shape member in the thickness direction of the joining plate, and the joint is joined to the second joint portion of the second hollow shape member. The fourth joint portion of the plate is overlapped in the thickness direction of the joining plate, the overlapping portion of the first joint portion and the third joint portion, and the overlap of the second joint portion and the fourth joint portion The mating part is friction stir welded by inserting a friction stir welding rotary tool from the direction perpendicular to each superimposed surface,
Joining surface of the first joint portion of the first hollow shape member and the third joint portion of the joining plate and joining of the second joint portion of the second hollow shape member and the fourth joint portion of the joining plate. The surface includes the first joint portion of the first hollow shape member and the second joint portion of the second hollow shape member, the second plate member of the first hollow shape member, and the fourth plate of the second hollow shape member. The joint plate is formed so as to be half the height of the plate thickness of the plate-like member, and the plate-like portion between the third joint portion and the fourth joint portion is the first plate-like member and the third plate-like shape. It is recessed to the joint part side with the member, and the dent is formed to be half the thickness of the plate-like part of the joint plate,
Thickness of the second plate member thickness of the center line C ₁ and the thickness of the center line C ₂ and the joining plate of said fourth plate-shaped member of the second hollow shape member of the first hollow shape member It is located on the extension of the center line C ₃ things,
A structure characterized by

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