Friction stirring bonding method

Abstract

To provide a friction agitation joint method capable of easily fitting a hollow extrusion member and a cut hollow extrusion member and preferably joining the fitting part.SOLUTION: A friction agitation joint method of the present disclosure is a friction agitation joint method of joining a first hollow extrusion member including a first tapered part and a second hollow extrusion member including a second tapered part obtained by cutting the first hollow extrusion member in an extrusion direction by friction agitation joining. The friction agitation joint method includes performing friction agitation joining of a fitting part of the first tapered part and the second tapered part from the outside of the fitting part by using a rotary tool in a state where the second tapered part is arranged in the outside of the first tapered part and the first tapered part and the second tapered part fit to each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This disclosure relates to a friction stir welding method for joining a hollow extruded material to a cut hollow extruded material. [Background technology]

[0002] One joining technique known is friction stir welding, in which the deformation resistance of the materials to be joined is reduced by frictional heat, followed by stirring (plastic flow) to perform the joining. The following friction stir welding method has been disclosed as a method for joining hollow extruded materials.

[0003] For example, Patent Document 1 describes a friction stir joining method in which a first member and a second member made of hollow extruded profiles are butted together and the butt joint is stirred with a rotary tool, wherein the first member consists of a first faceplate and a second faceplate arranged opposite each other, a plurality of ribs connecting the first faceplate and the second faceplate, and end ribs connecting the first faceplate and the second faceplate at the ends of the first faceplate and the second faceplate, the second member consists of a first faceplate and a second faceplate arranged opposite each other, and ribs connecting the first faceplate and the second faceplate, and the butt joint is between the first faceplate and the connecting ribs of the first member A friction stir welding method is disclosed, comprising a first joint consisting of a connecting portion and the end of the first faceplate of the second member that abuts against the connecting portion, and a second joint consisting of a connecting portion between the second faceplate of the first member and the connecting rib and the end of the second faceplate of the second member that abuts against the connecting portion, wherein the first joint and the second joint are joined by stirring, the cross-sectional area of ​​the first joint is formed to be smaller than the cross-sectional area of ​​the second joint, and the method is characterized in that the first joint is friction stir-welded first, and then the second joint is friction stir-welded. According to the friction stir welding method of Patent Document 1, it is possible to suppress longitudinal warping that occurs after friction stir-welding both sides of a hollow extruded profile by changing the cross-sectional area of ​​the joint portion (thick portion) that is friction stir-welded on one faceplate side and the other faceplate side. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2012-066259 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] It is conceivable to join multiple hollow extruded materials together in the radial direction (a direction perpendicular to the extrusion direction) to form relatively large members such as plate-like members.

[0006] In such cases, when the desired width of a relatively large member, such as a plate-shaped member, is an integer multiple of the hollow extruded material, the required number of hollow extruded materials can be joined together to obtain a hollow extruded material of the desired width.

[0007] However, if the desired width of a relatively large member, such as a plate-shaped member, is not an integer multiple of the hollow extruded material, that is, for example, if the desired width is 10.5 times the hollow extruded material, then it is necessary to cut at least one hollow extruded material in the extrusion direction and join the hollow extruded material thus cut to the other hollow extruded material. Such joining can be achieved, for example, by using friction stir welding with a rotary tool.

[0008] Therefore, the object of this disclosure is to provide a friction stir welding method that can easily join a first hollow extruded material and a second hollow extruded material having a shape obtained by cutting the first hollow extruded material in the extrusion direction. [Means for solving the problem]

[0009] This disclosure aims to achieve the above objectives by the following means:

[0010] <Aspect 1> A first hollow extruded material, A second hollow extruded material having the shape obtained by cutting the first hollow extruded material in the extrusion direction, A friction stir welding method for joining by friction stir welding, The joint portion of the first hollow extruded material has a first tapered portion, and the cut portion of the second hollow extruded material has a second tapered portion that fits into the first tapered portion. Accordingly, the second tapered portion is arranged outside the first tapered portion and is configured to fit thereinto. The friction stir welding of the fitting portion between the first tapered portion and the second tapered portion is performed from the outside of the fitting portion using a rotating tool in a state where the second tapered portion is arranged outside the first tapered portion and the first tapered portion and the second tapered portion are fitted together. Friction stir welding method. <Aspect 2> The rotating tool has a penetrating portion that penetrates into the workpiece during friction stir welding of the workpiece. Let the angle formed by the radial direction and the diagonal line of the penetrating portion in the cross section passing through the rotation center of the rotating tool be θ tool And when the angle of the second tapered portion is θ work Then, when θ tool And θ work The difference between them is within 10°. The friction stir welding method according to Aspect 1. <Aspect 3> The rotation direction of the rotating tool is a forward direction with respect to the advancing direction of the rotating tool on the joint surface side of the first tapered portion. The friction stir welding method according to Aspect 1 or Aspect 2.

Advantages of the Invention

[0011] According to the friction stir welding method of the present disclosure, the first hollow extruded material and the second hollow extruded material having a shape obtained by cutting the first hollow extruded material in the extrusion direction can be easily joined.

Brief Description of the Drawings

[0012] [Figure 1] FIG. 1 is a schematic cross-sectional view for explaining the first hollow extruded material and the second hollow extruded material of the present disclosure. [Figure 2] FIG. 2 is a schematic cross-sectional view for explaining the friction stir welding of the first hollow extruded material and the second hollow extruded material of the present disclosure. [Figure 3]FIG. 3 is a schematic cross-sectional view for explaining the rotary tool for friction stir welding of the present disclosure. [Figure 4] FIG. 4 is a schematic cross-sectional view for explaining the first hollow extruded material of the present disclosure. [Figure 5] FIG. 5 is a schematic view for explaining the friction stir welding of the first hollow extruded material and the second hollow extruded material of the present disclosure. [Figure 6] FIG. 6 is a cross-sectional view for explaining the first hollow extruded material and the second hollow extruded material in Example 1. [Figure 7] FIG. 7 is a schematic view for explaining the friction stir welding for joining hollow extruded materials having no tapered shape.

MODE FOR CARRYING OUT THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described in detail. Note that the present disclosure is not limited to the following embodiments, and can be variously modified and implemented within the scope of the gist of the present disclosure.

[0014] 《Friction Stir Welding Method》 The friction stir welding method of the present disclosure is a first hollow extruded material, a second hollow extruded material having a shape obtained by cutting the first hollow extruded material in the extrusion direction, and a friction stir welding method for joining them by friction stir welding, where the joint portion of the first hollow extruded material has a first tapered shape portion, and the cut portion of the second hollow extruded material has a second tapered shape portion that fits into the first tapered shape portion, whereby the second tapered shape portion is arranged outside the first tapered shape portion and is adapted to fit, including performing friction stir welding of the fitting portion between the first tapered shape portion and the second tapered shape portion from the outside of the fitting portion using a rotary tool in a state where the second tapered shape portion is arranged outside the first tapered shape portion and the first tapered shape portion and the second tapered shape portion are fitted together

[0015] According to the friction stir welding method of this disclosure, a first hollow extruded material and a second hollow extruded material having a shape obtained by cutting the first hollow extruded material in the extrusion direction can be easily joined.

[0016] Specifically, as shown in Figures 1 and 2, in the method of this disclosure, the joint portion of the first hollow extruded material 11 has first tapered portions 12, 12', and the cut portion of the second hollow extruded material 13 has second tapered portions 14, 14' that fit into the first tapered portions 12, 12', so that the second tapered portions 14, 14' are positioned outside the first tapered portions 12, 12' and fitted together. As a result, the second tapered portions are located on the outside of the first hollow extruded material, and therefore, even when a load is applied by pressing from the outside with a rotary tool 21, deformation of the second hollow extruded material 13 can be suppressed, and good friction stir welding can be performed.

[0017] In contrast, in a friction stir welding method that friction stir-welds a hollow extruded material 72 without a tapered shape and a cut hollow extruded material 73 having the shape obtained by cutting the hollow extruded material 72 in the extrusion direction, as shown in Figure 7, for example, the load applied by pressing the rotating tool 71 against the joint may deform the cut hollow extruded material 73, potentially resulting in poor friction stir welding.

[0018] Furthermore, in order to suppress deformation of the cut hollow extruded material, it is conceivable to create irregularities in the mating section to fit the cut hollow extruded material into other hollow extruded materials. With this method, since the cut hollow extruded material and other hollow extruded materials fit together at the joint, it is thought that deformation of the cut hollow extruded material due to the force pressing the rotary tool during friction stir welding will be suppressed. However, since hollow extruded materials generally have poor dimensional accuracy, mating may not be performed properly, and therefore there is a risk that the cut hollow extruded material will deform due to the force pressing the rotary tool during friction stir welding.

[0019] <Hollow extruded material and arrangement of hollow extruded material> The friction stir welding method disclosed herein is The first hollow extruded material, A second hollow extruded material having the shape obtained by cutting the first hollow extruded material in the extrusion direction, A friction stir welding method for joining by friction stir welding, The joint portion of the first hollow extruded material has a first tapered portion, and the cut portion of the second hollow extruded material has a second tapered portion that fits into the first tapered portion, so that the second tapered portion is positioned outside the first tapered portion and fitted into it.

[0020] The material of the hollow extruded material is not particularly limited, but for example, aluminum alloys, magnesium alloys, titanium alloys, steel materials, etc., can be used.

[0021] Figure 1 is a schematic cross-sectional view showing one embodiment of the first and second hollow extruded materials of the present disclosure, but is not limited to this embodiment.

[0022] The first hollow extruded material 11 has two first tapered portions 12, 12' on one face of the first hollow extruded material. The second hollow extruded material 13 is obtained by cutting the hollow extruded material in the extrusion direction, and the cut portion has two second tapered portions 14, 14'. The second tapered portions 14, 14' are shaped to fit into the first tapered portions 12, 12'.

[0023] The shape of the first tapered portion (taper length and taper angle) is not particularly limited, but any shape that can be provided on the first hollow extruded material is acceptable. Similarly, the shape of the second tapered portion (taper length and taper angle) is not particularly limited, but any shape that can be provided on the second hollow extruded material and that can be fitted into the first tapered portion is acceptable.

[0024] The shapes of the first tapered sections 12 and 12' described above are not particularly limited, and may be the same or different in shape. Similarly, the shapes of the second tapered sections 14 and 14' described above are not particularly limited, as long as they can be fitted into the corresponding first tapered sections, and may be the same or different in shape.

[0025] The first tapered portion described above is not particularly limited, but may be made by cutting a part of the first hollow extruded material. Similarly, the second tapered portion described above is not particularly limited, but may be made by cutting the cut portion of the second hollow extruded material obtained by cutting.

[0026] Using the schematic diagram in Figure 2, one embodiment of the state in which the first hollow extruded material and the second hollow extruded material of this disclosure are interlocked and arranged will be explained, but the invention is not limited to this embodiment.

[0027] The first hollow extruded material 11 and the second hollow extruded material 13 are arranged so that their tapered portions fit together to form mating portions 22 and 22'. In the mating portions 22 and 22', the second hollow extruded material 13 is positioned outside the first hollow extruded material 11 due to the structure of the first and second tapered portions.

[0028] <Joining of the joint> The friction stir welding method disclosed herein is The method includes, with the second tapered portion positioned outside the first tapered portion and the first tapered portion and the second tapered portion interlocked, friction stir welding of the interlocked portion between the first tapered portion and the second tapered portion is performed from the outside of the interlocked portion using a rotary tool.

[0029] Figure 2 is a schematic cross-sectional view showing one embodiment of friction stir welding of a first hollow extruded material and a second hollow extruded material according to this disclosure, but is not limited to this embodiment.

[0030] With respect to the fitting portion 14, the rotary tool 21 is pressed against the outside of the hollow extruded material to perform friction stir welding. As a result of the second tapered portions 14 and 14' of the second hollow extruded material 13 being fitted outside the first tapered portions 12 and 12' of the first hollow extruded material 11, the second tapered portions 14 and 14' are present outside the first hollow extruded material 11. Therefore, even when a load is applied from the outside of the hollow extruded material by the rotary tool 21, deformation of the second hollow extruded material 13 can be suppressed, and good friction stir welding can be performed.

[0031] 〈Rotary tool〉 The rotary tool used in the friction stir welding method of the present disclosure has a penetration portion that penetrates the workpiece during friction stir welding of the workpiece, the angle formed by the radial direction of the penetration portion and the diagonal line in the cross section passing through the rotation center of the rotary tool is θ tool and when the angle of the second tapered portion is θ work it may include that the difference between θ tool and θ work is within 10°.

[0032] FIG. 3 is a schematic view of a cross section passing through the rotation axis of the rotary tool of the present disclosure, but is not limited to this case.

[0033] The rotary tool 31 in FIG. 3 has a penetration portion 32 that penetrates the workpiece during friction stir welding, and this may be referred to as a probe. The θ tool shown in the rotary tool 31 is the angle formed by the radial direction of the penetration portion of the rotary tool and the diagonal line in the cross section passing through the rotation center of the rotary tool. Here, θ tool is not particularly limited, but for example, it becomes smaller when the diameter of the penetration portion of the rotary tool is large, and becomes larger when the length of the penetration portion is long.

[0034] From the viewpoint of performing friction stir welding efficiently, although not particularly limited, when the angle of the second tapered portion is θ work it is preferable that the difference between θ tool and θ work is within 10°. Using FIG. 3, θtool and θ work The relationship is explained below.

[0035] Figure 3(a) shows θ tool θ work This condition is more pronounced when, for example, the diameter of the insertion portion of the rotary tool is small relative to the second tapered section, or when the length of the insertion portion of the rotary tool is long. The condition shown in Figure 3(a) is undesirable because a large portion of the area being stirred by the rotary tool does not contribute to the joining process, resulting in wasted stirring by the rotary tool.

[0036] Figure 3(b) shows θ tool and θ work The two dimensions are equal, and the diameter and length of the insertion portion of the rotary tool match the second tapered section. The state shown in Figure 3(b) is preferable from the viewpoint of efficiently performing friction stir welding, as a large proportion of the area stirred by the rotary tool contributes to the joining process.

[0037] Figure 3(c) is similar to Figure 3(b) in that θ tool and θ work In this state, the diameter and length of the insertion portion of the rotary tool are smaller than those of the second tapered portion. In this state, only the surface of the mating portion is joined. However, if the strength is sufficient, the state in Figure 3(c) is preferable from the viewpoint of efficiently performing friction stir welding, as a large proportion of the area stirred by the rotary tool contributes to the joining.

[0038] Figure 3(d) shows θ tool θ work A smaller size is a condition where, for example, the diameter of the insertion portion of the rotary tool is large relative to the second tapered section, or the length of the insertion portion of the rotary tool is short. The condition in Figure 3(d) is undesirable from the standpoint that a large proportion of the area stirred by the rotary tool does not contribute to the joining, and the rotary tool is stirring unnecessarily.

[0039] When a rotary tool performs unnecessary agitation, it is undesirable because it places an excessive load on the tool, shortening its lifespan, and also because it requires more capacity from the equipment than necessary.

[0040] <Rotation direction of rotary tools> The rotation direction of the rotary tool used in the friction stir welding of this disclosure is: The joining surface side of the first tapered portion may include the direction being forward with respect to the direction of travel of the rotating tool (i.e., the joining direction).

[0041] Figure 4 is a schematic cross-sectional view showing one embodiment of the first tapered portion of the present disclosure, and is a schematic diagram for explaining the joint surface side and the joint interior side, but is not limited to this case.

[0042] The first hollow extruded material 11 is provided with a first tapered portion 12. The joining surface side 41 of the first tapered portion 12 is the surface that the first tapered portion 12 contacts with the rotating tool when the first hollow extruded material 11 and the second hollow extruded material 13 are mated together and a rotating tool is pressed against them from the outside, i.e., the part on the outside of the hollow extruded material. On the other hand, the joining interior side 42 of the first tapered portion 12 is the surface that the first tapered portion 12 cannot contact with the rotating tool when the first hollow extruded material 11 and the second hollow extruded material 12 are mated together and a rotating tool is pressed against them from the outside, i.e., the part on the inside of the hollow extruded material.

[0043] Figure 5 is a schematic diagram showing one embodiment of friction stir welding performed on a first hollow extruded material and a second hollow extruded material using a rotary tool, but is not limited to this embodiment.

[0044] In continuous friction stir welding, the rotary tool performs rotational and translational motion simultaneously. In the rotary tool shown in Figure 5, the rotary tool rotates clockwise and translates in the direction of the straight arrow. In this case, the direction of rotation of the rotary tool is such that the first hollow extruded material 11 is "advancing" and the second hollow extruded material 13 is "reversing". On the other hand, if the rotary tool shown in Figure 5 rotates counterclockwise and translates in the direction of the straight arrow, the direction of rotation of the rotary tool is such that the first hollow extruded material 11 is "reversing" and the second hollow extruded material 13 is "advancing".

[0045] Furthermore, if the rotating tool is translating in the direction of the linear arrow, and the direction is forward relative to the direction of travel in the first hollow extruded material 11, then the rotation direction of the rotating tool will be clockwise. In this way, the rotation direction can be determined by determining the direction of travel of the rotating tool and the orientation of the joining surfaces relative to the direction of travel (forward direction / backward direction).

[0046] The rotation direction of the rotary tool used in friction stir welding is not particularly limited, but it is preferable that the rotation direction is forward relative to the direction of travel of the rotary tool (i.e., the joining direction) on the joining surface side of the first tapered shape. In friction stir welding, it is known that defects tend to occur in the deeper parts on the advancing side of the rotary tool. Therefore, if the joining surface side of the first tapered shape is in a direction that is forward relative to the direction of travel of the rotary tool (i.e., the joining direction), even if a defect occurs in the deeper parts, the part to be joined is on the surface, so the impact on the joining quality is small. On the other hand, if the joining interior side of the first tapered shape is in a direction that is forward relative to the direction of travel of the rotary tool (i.e., the joining direction), if there is a defect in the deeper parts, the part to be joined is also in a deep part, so a joining defect is likely to occur. [Examples]

[0047] The present disclosure will be further described with reference to the following embodiments, but the scope of the present disclosure is not limited to these embodiments.

[0048] Example 1 A hollow extruded material (material: A6005C) was fabricated having opposing surfaces with a thickness of 5 mm and opposing surfaces with a thickness of 3 mm. Next, as shown in Figure 6, two first tapered sections 62 and 62' were provided on one side of a 3 mm thick surface of the first hollow extruded material 61 (Figure 6). For the second hollow extruded material 63, the prepared hollow extruded material was cut in the extrusion direction to provide second tapered sections 64 and 64' that fit into the two first tapered sections 62 and 62', respectively (Figure 6). Here, the angles of the second tapered sections 64 and 64' were 45° each. The second tapered sections were positioned to fit outside the first tapered sections. Friction stir welding was performed at a joining speed of 1.0 m / min and a rotary tool rotation speed of 3000 rpm. The rotary tool used for friction stir welding had a penetration diameter of φ3 mm and a penetration length of 3 mm. The angle formed by the radial direction of the penetration and the diagonal of the cross-section passing through the rotation axis of the rotary tool was 45°, which was equal to the angle of the second tapered section. Furthermore, the rotation direction of the rotary tool was forward relative to the direction of travel of the rotary tool on the joining surface side of the first tapered section during friction stir welding. A structure was obtained in which a first hollow extruded material and a second hollow extruded material having a shape obtained by cutting the hollow extruded material in the extrusion direction were well joined together.

[0049] While preferred embodiments of the friction stir welding method of this disclosure have been described, those skilled in the art will understand that modifications are possible without departing from the claims. [Explanation of Symbols]

[0050] 11. First hollow extruded material 12, 12' First tapered section 13. Second hollow extruded material 14, 14' Second tapered section 21 Rotary Tools 22, 22' mating part 31 Rotary Tools 32. Penetration part (probe) of a rotary tool 41 Joint surface side of the first tapered section 42 Inside the joint of the first tapered section 61 First hollow extruded material 62, 62' First tapered section 63. Second hollow extruded material 64, 64' Second tapered section 71 Rotary Tools 72 Hollow extruded material (without tapered section) 73. Cut hollow extruded material (without tapered section)

Claims

1. The first hollow extruded material, A second hollow extruded material having a shape obtained by cutting the first hollow extruded material in the extrusion direction, A friction stir welding method for joining by friction stir welding, The joint portion of the first hollow extruded material has a first tapered portion, and the cut portion of the second hollow extruded material has a second tapered portion that fits into the first tapered portion, so that the second tapered portion is positioned outside the first tapered portion and fitted into it. The second tapered portion is positioned outside the first tapered portion, and the first tapered portion and the second tapered portion are interlocked. The friction stir welding of the interlocked portion between the first tapered portion and the second tapered portion is performed from the outside of the interlocked portion using a rotary tool. Friction stir welding method.

2. The rotary tool has a penetration portion that penetrates the material to be joined during friction stir welding of the material to be joined, The angle between the radial direction and the diagonal of the penetration portion in the cross-section passing through the rotation center of the rotary tool is θ. ｔｏｏｌ And the angle of the second tapered portion is θ ｗｏｒｋ When we do this, θ ｔｏｏｌ and θ ｗｏｒｋ The difference is within 10°. The friction stir welding method according to claim 1.

3. The friction stir welding method according to claim 1 or 2, wherein the direction of rotation of the rotating tool is a direction that advances relative to the direction of travel of the rotating tool on the joining surface side of the first tapered shape portion.

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