Friction agitation joint 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] The present disclosure relates to a friction stir welding method for joining a hollow extruded material and a cut hollow extruded material. [Background technology]

[0002] As one of the joining techniques, friction stir welding is known, in which the deformation resistance of the materials to be joined is reduced by frictional heat, and then the materials are stirred (plastic flow) to join them. The following friction stir welding method has been disclosed as a method for joining hollow extrusion materials together.

[0003] For example, Patent Document 1 describes a friction stir welding method in which a first member and a second member made of hollow extruded shapes are butted together and the butted portion is joined by stirring with a rotary tool, in which the first member comprises a first face plate and a second face plate disposed opposite each other, a plurality of ribs connecting the first face plate and the second face plate, and end ribs connecting the first face plate and the second face plate at end portions of the first face plate and the second face plate, the second member comprises a first face plate and a second face plate disposed opposite each other, and ribs connecting the first face plate and the second face plate, and the butted portion is a friction stir welding method in which the first member and the second member are butted together and the connecting ribs are butted together A friction stir welding method for joining the first joint and the second joint by stirring the first joint and the second joint, the first joint being made of a connecting portion and an end of the first face plate of the second member that is butted against the connecting portion, and the second joint being made of a connecting portion between the second face plate of the first member and the connecting rib and an end of the second face plate of the second member that is butted against the connecting portion, the first joint being formed to have a smaller cross-sectional area than the second joint, and the first joint being friction stir welded first, and then the second joint being friction stir welded. According to the friction stir welding method of Patent Document 1, it is said that by changing the cross-sectional area of ​​the joint (thick portion) to be friction stir welded on one face plate side and the other face plate side, it is possible to suppress longitudinal warping that occurs after friction stir welding both sides of a hollow extrusion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-066259 A Summary of the Invention [Problem to be solved by the invention]

[0005] It is conceivable that a plurality of hollow extrusions may be joined together in the radial direction (perpendicular to the extrusion direction) to form a relatively large member, such as a plate-shaped member.

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

[0007] However, when the desired width of a relatively large member such as a plate-like member is not an integer multiple of the width of the hollow extrusion, i.e., for example, when the desired width is 10.5 times the width of the hollow extrusion, it is necessary to cut at least one hollow extrusion in the extrusion direction and join the cut hollow extrusion to another hollow extrusion. Such joining can be achieved, for example, by using friction stir welding with a rotating tool.

[0008] Therefore, an object of the present 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] The present disclosure achieves the above object by the following means.

[0010] <Aspect 1> A first hollow extrusion material, a second hollow extrusion material having a shape obtained by cutting the first hollow extrusion material in the extrusion direction; A friction stir welding method for joining by friction stir welding, the joint portion of the first hollow extrusion material has a first tapered portion, and the cut portion of the second hollow extrusion material has a second tapered portion that fits into the first tapered portion, so that the second tapered portion is disposed outside the first tapered portion and fits into it; The second taper shape portion is disposed outside the first taper shape portion, and in a state in which the first taper shape portion and the second taper shape portion are mated, friction stir welding of the mating portion between the first taper shape portion and the second taper shape portion is performed from the outside of the mating portion using a rotating tool. Friction stir welding method. <Aspect 2> The rotating tool has a penetration portion that penetrates the workpieces during friction stir welding of the workpieces, The angle between the radial direction of the penetration part and the diagonal line in the cross section passing through the rotation center of the rotary tool is defined as θ tool and the angle of the second tapered portion is θ work Then, θ tool and θ work The difference is within 10°. 2. The friction stir welding method according to aspect 1. <Aspect 3> A friction stir welding method according to aspect 1 or aspect 2, wherein the rotation direction of the rotating tool is a forward direction on the welding surface side of the first tapered shaped portion relative to the traveling direction of the rotating tool. Effect of the Invention

[0011] According to the friction stir welding method of the present disclosure, it is possible to 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. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic cross-sectional view illustrating a first hollow extruded material and a second hollow extruded material according to the present disclosure. [Diagram 2] FIG. 2 is a schematic cross-sectional view for explaining friction stir welding of a first hollow extrusion material and a second hollow extrusion material according to the present disclosure. [Diagram 3]FIG. 3 is a schematic cross-sectional view for explaining a rotary tool for friction stir welding according to the present disclosure. [Figure 4] FIG. 4 is a schematic cross-sectional view illustrating a first hollow extrusion material according to the present disclosure. [Diagram 5] FIG. 5 is a schematic diagram for explaining friction stir welding of a first hollow extruded material and a second hollow extruded material according to the present disclosure. [Figure 6] FIG. 6 is a cross-sectional view for explaining the first hollow extrusion material and the second hollow extrusion material in the first embodiment. [Figure 7] FIG. 7 is a schematic diagram for explaining friction stir welding for joining hollow extruded members that do not have a tapered shape. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 various modifications can be made within the scope of the gist of the present disclosure.

[0014] 《Friction stir welding method》 The friction stir welding method of the present disclosure includes: A first hollow extrusion material; a second hollow extrusion material having a shape obtained by cutting the first hollow extrusion material in the extrusion direction; A friction stir welding method for joining by friction stir welding, the joint portion of the first hollow extrusion material has a first tapered portion, and the cut portion of the second hollow extrusion material has a second tapered portion that fits into the first tapered portion, so that the second tapered portion is disposed outside the first tapered portion and fits into it; The method includes performing friction stir welding of the joint portion between the first taper shape portion and the second taper shape portion from the outside of the joint portion using a rotating tool, with the second taper shape portion being disposed outside the first taper shape portion and the first taper shape portion being joined together.

[0015] According to the friction stir welding method of the present disclosure, it is possible to 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.

[0016] Specifically, for example, as shown in Figures 1 and 2, in the method of the present disclosure, the joint portion of the first hollow extrusion material 11 has the first tapered portions 12, 12', and the cut portion of the second hollow extrusion material 13 has the second tapered portions 14, 14' that fit with the first tapered portions 12, 12', so that the second tapered portions 14, 14' are disposed outside and fit with the first tapered portions 12, 12'. As a result, the second tapered portion is present outside the first hollow extrusion material, so that even if a load is applied by pressing from the outside with the rotary tool 21, deformation of the second hollow extrusion material 13 can be suppressed, and good friction stir welding can be performed.

[0017] In contrast, for example, in a friction stir welding method as shown in FIG. 7, in which a hollow extrusion material 72 that does not have a tapered portion is friction stir welded to a cut hollow extrusion material 73 having a shape obtained by cutting the hollow extrusion material 72 in the extrusion direction, the load of pressing the rotating tool 71 against the joint may deform the cut hollow extrusion material 73, which may result in poor friction stir welding.

[0018] In order to suppress the deformation of the cut hollow extrusion material, it is also possible to provide an unevenness at the joint portion so that the cut hollow extrusion material fits into another hollow extrusion material. According to this method, the cut hollow extrusion material fits into the other hollow extrusion material at the joint portion, so it is considered that the deformation of the cut hollow extrusion material due to the force of pressing the rotating tool during friction stir welding is suppressed. However, since hollow extrusion materials generally have poor dimensional accuracy, the joint cannot be performed well, and therefore the force of pressing the rotating tool during friction stir welding may cause the cut hollow extrusion material to deform.

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

[0020] The material of the hollow extrusion material is not particularly limited, but for example, an aluminum alloy, a magnesium alloy, a titanium alloy, a steel material, etc. can be used.

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

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

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

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

[0025] The first tapered portion may be produced by cutting a part of the first hollow extruded material, but is not particularly limited thereto, and the second tapered portion may be produced by cutting a cut portion of the second hollow extruded material, but is not particularly limited thereto.

[0026] One embodiment of a state in which the first hollow extrusion material and the second hollow extrusion material of the present disclosure are arranged in a mated state will be described with reference to the schematic diagram of FIG. 2, but the present disclosure is not limited to this embodiment.

[0027] The first hollow extrusion material 11 and the second hollow extrusion material 13 are arranged so that their tapered portions fit together to form mating portions 22, 22'. In the mating portions 22, 22', the second hollow extrusion material 13 is arranged so as to be on the outer side of the first hollow extrusion material 11 due to the structure of the first and second tapered portions.

[0028] <Joining of joints> The friction stir welding method of the present disclosure includes: The method includes performing friction stir welding of the joint portion between the first taper shape portion and the second taper shape portion from the outside of the joint portion using a rotating tool, while the second taper shape portion is positioned outside the first taper shape portion and the first taper shape portion is joined to the second taper shape portion.

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

[0030] Friction stir welding is performed by pressing the rotating tool 21 against the mating portion 14 from the outside of the hollow extrusion material. As a result of the second tapered portions 14, 14' of the second hollow extrusion material 13 being mated to the outside of the first tapered portions 12, 12' of the first hollow extrusion material 11, the second tapered portions 14, 14' are present outside the first hollow extrusion material 11. Therefore, even if a load is applied from the outside of the hollow extrusion material by the rotating tool 21, deformation of the second hollow extrusion material 13 can be suppressed, and good friction stir welding can be performed.

[0031] Rotating tools The rotating tool used in the friction stir welding method of the present disclosure is A penetration portion is provided which penetrates into the workpieces during friction stir welding of the workpieces, The angle between the radial direction of the penetration part and the diagonal line in the cross section passing through the rotation center of the rotary tool is defined as θ tool and the angle of the second tapered portion is θ work Then, θ tool and θ work The difference between the angle .theta. and the angle .theta. may be within 10 degrees.

[0032] 3A to 3C are schematic cross-sectional views passing through the rotation axis of the rotary tool of the present disclosure, but the present disclosure is not limited to this case.

[0033] The rotary tool 31 in FIG. 3 has a penetrating portion 32 that penetrates into the workpieces during friction stir welding, and may be referred to as a probe. tool is the angle between the radial direction of the penetration part 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, becomes smaller when the diameter of the penetration part of the rotary tool is large, and becomes larger when the length of the penetration part is long.

[0034] From the viewpoint of efficient friction stir welding, the angle of the second tapered portion is preferably set to, but not limited to, θ work Then, θ tool and θ work It is preferable that the difference between θ and θ is within 10°.tool and θ work The relationship between these is explained below.

[0035] Figure 3(a) shows the tool is θ work For example, the diameter of the penetrating part of the rotating tool is smaller than the second tapered part, or the length of the penetrating part of the rotating tool is longer than the second tapered part. The state of Fig. 3(a) is an unfavorable state in that there are many parts of the part stirred by the rotating tool that do not contribute to welding, and the rotating tool stirs uselessly.

[0036] Figure 3(b) shows the tool and θ work In this state, the diameter and length of the penetration part of the rotating tool are equal to those of the second tapered portion. In the state shown in Fig. 3(b), the proportion of the part that contributes to welding in the part stirred by the rotating tool is high, and this is a preferable state from the viewpoint of efficient friction stir welding.

[0037] In Fig. 3(c), the θ tool and θ work In this state, the diameter and length of the penetration part of the rotating tool are equal to those of the second tapered portion, but the diameter and length of the penetration part of the rotating tool are smaller than those of the second tapered portion. In this state, the only part that is welded is the surface of the joint. However, if the strength is sufficient, the state of Figure 3(c) is a favorable state from the viewpoint of efficient friction stir welding, since a large proportion of the part that contributes to the weld is occupied by the part stirred by the rotating tool.

[0038] Figure 3(d) shows the tool is θ work For example, the diameter of the penetrating part of the rotating tool is larger than the second tapered part, or the length of the penetrating part of the rotating tool is short. The state of Fig. 3(d) is an unfavorable state in that a large proportion of the part stirred by the rotating tool does not contribute to welding, and the rotating tool stirs uselessly.

[0039] If the rotating tool stirs unnecessarily, it is undesirable because the rotating tool is subjected to a load greater than necessary, shortening its lifespan, and because the equipment requires greater capacity than necessary.

[0040] <Rotation direction of rotating tools> The rotation direction of the rotary tool used in the friction stir welding of the present disclosure is as follows: It may include a direction that is an advance direction with respect to a traveling direction of the rotary tool (that is, a joining direction) on the joining surface side of the first tapered portion.

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

[0042] The first hollow extrusion material 11 is provided with a first tapered portion 12. A joining surface side 41 of the first tapered portion 12 is a surface that the first tapered portion 12 comes into contact with a rotating tool when the first hollow extrusion material 11 and the second hollow extrusion material 13 are joined and a rotating tool is pressed against them from the outside, i.e., a portion that is on the outside of the hollow extrusion material. On the other hand, a joining inner side 42 of the first tapered portion 12 is a surface that the first tapered portion 12 cannot come into contact with a rotating tool when the first hollow extrusion material 11 and the second hollow extrusion material 12 are joined and a rotating tool is pressed against them from the outside, i.e., a portion that is on the inside of the hollow extrusion material.

[0043] FIG. 5 is a schematic diagram showing one embodiment in which a first hollow extrusion material and a second hollow extrusion material are friction stir welded together using a rotary tool, but the embodiment is not limited to this.

[0044] In continuous friction stir welding, the rotating tool rotates and translates at the same time. The rotating tool shown in FIG. 5 rotates clockwise and translates in the direction of the straight arrow. At this time, the rotating tool rotates in the direction of the first hollow extrusion material 11 as the "advancing side" and the second hollow extrusion material 13 as the "retreating side". On the other hand, if the rotating tool shown in FIG. 5 rotates counterclockwise and translates in the direction of the straight arrow, the rotating tool rotates in the direction of the first hollow extrusion material 11 as the "retreating side" and the second hollow extrusion material 13 as the "advancing side".

[0045] Moreover, the rotation direction of the rotating tool is clockwise if the rotating tool is moving in a translational manner in the direction of the straight arrow and is a forward direction relative to the traveling direction in the first hollow extrusion material 11. In this way, the rotation direction is determined by determining the traveling direction of the rotating tool and the orientation of the joining surface relative to the traveling direction (forward direction / reverse direction).

[0046] The rotation direction of the rotating tool used in friction stir welding is not particularly limited, but is preferably a forward direction with respect to the moving direction of the rotating tool (i.e., the joining direction) on the joining surface side of the first tapered portion. It is known that defects are likely to occur deep on the advancing side of the rotating tool in friction stir welding. Therefore, when the joining surface side of the first tapered portion is in a forward direction with respect to the moving direction of the rotating tool (i.e., the joining direction), even if a defect occurs deep, the part to be joined is on the surface, so the effect on the joining quality is small. On the other hand, when the joining inner side of the first tapered portion is in a forward direction with respect to the moving direction of the rotating tool (i.e., the joining direction), if there is a defect deep, the part to be joined is also deep, so that poor joining is likely to occur. EXAMPLES

[0047] The present disclosure will be described in more detail with reference to the following examples, but the scope of the present disclosure is not limited to these examples.

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

[0049] Although preferred embodiments of the friction stir welding method of the present disclosure have been described, those skilled in the art will recognize that modifications can be made without departing from the scope of the claims. [Explanation of symbols]

[0050] 11 First hollow extrusion material 12, 12' First tapered portion 13 Second hollow extrusion material 14, 14' Second tapered portion 21 Rotary tools 22, 22' mating part 31 Rotary tools 32 Rotary tool penetration part (probe) 41: Joining surface side of first tapered portion 42 Joint inner side of first tapered portion 61 First hollow extrusion material 62, 62' First tapered portion 63 Second hollow extrusion material 64, 64' Second tapered section 71 Rotary tools 72 Hollow extrusion material (without tapered section) 73 Cut hollow extrusion (without tapered section)

Claims

1. A first hollow extrusion material; a second hollow extrusion material having a shape obtained by cutting the first hollow extrusion material in the extrusion direction; A friction stir welding method for joining by friction stir welding, the joint portion of the first hollow extrusion material has a first tapered portion, and the cut portion of the second hollow extrusion material has a second tapered portion that fits into the first tapered portion, so that the second tapered portion is disposed outside the first tapered portion and fits into it; and performing friction stir welding of the joint portion between the first taper shape portion and the second taper shape portion from the outside of the joint portion using a rotary tool in a state in which the second taper shape portion is disposed outside the first taper shape portion and the first taper shape portion is joined to the second taper shape portion. Friction stir welding method.

2. The rotating tool has a penetration portion that penetrates the workpieces during friction stir welding of the workpieces, and The angle between the radial direction of the penetration portion in the cross section passing through the rotation center of the rotary tool and the diagonal line is defined as θ ｔｏｏｌ and the angle of the second tapered portion is θ ｗｏｒｋ Then, θ ｔｏｏｌ and θ ｗｏｒｋ The difference is within 10°. The friction stir welding method according to claim 1 .

3. 3. The friction stir welding method according to claim 1, wherein the rotating direction of the rotating tool is a forward direction on the welding surface side of the first tapered portion with respect to a traveling direction of the rotating tool.

Images