JP4782169B2 - Two-sided structure and manufacturing method thereof - Google Patents

Description

  The present invention relates to a friction stir welding die material and a method for manufacturing the same, and in particular, a two-sided structure body (hereinafter referred to as a long hollow die material) extending in a longitudinal direction used for large structures such as railway vehicles, ships, and aircrafts The present invention relates to a friction stir welding method for manufacturing a double skin panel.

  In general, two-sided structures (double skin panels) such as long hollow molds used for large structures such as railway vehicles, ships, and aircraft are butt-joined with multiple extruded materials arranged in parallel. For example, when joining such extruded dies, the butt joint is formed by fusion welding using MIG welding or the like. However, the method of joining by fusion welding causes problems such as thermal distortion.

  On the other hand, Japanese Patent Publication No. 7-505090 discloses the joining of members by friction stir welding, and as a solid phase joining method, a rotary tool made of a material substantially harder than a workpiece is used. There is a joining method in which a workpiece is joined by plastic flow caused by frictional heat generated between the rotating tool and the workpiece by being inserted into a weld and moving while rotating the rotating tool.

  In this friction welding method, since the welded member can be joined in the solid phase state while the solid phase portion softened while moving while rotating the rotating tool can be integrated and joined, there is no thermal distortion and the welding direction is substantially reduced. In particular, there is an advantage that even infinitely long members can be continuously solid-phase bonded in the longitudinal direction. Furthermore, since the solid-phase bonding utilizing the plastic flow of metal caused by frictional heat between the rotating tool and the welding member, the bonding portion can be bonded without melting. Further, since the heating temperature is low, deformation after joining is small. Since the joint is not melted, there are many advantages such as fewer defects.

  Furthermore, Japanese Patent No. 3152420 discloses a two-sided structure (double skin panel) such as a long hollow mold material used for large structures such as railway vehicles, ships, and aircraft, in which a plurality of extrusion molding materials are arranged in parallel. The joining of the two-sided structures (double skin panels) by the friction stir welding by constructing and butt joining the provided ones is described.

  Such a technique rotates only from the other side of the plate with the one side surface of the abutting portion between the end portion of the first plate and the end portion of the second plate being backed. A tool is inserted into the abutting portion, the abutting portion is frictionally joined, and the surface on the one side of the abutting portion is frictionally joined substantially flat, and the object obtained by the friction welding is This can be achieved by manufacturing the structure with the one side surface positioned on the outer surface of the structure.

  Furthermore, as a problem when the method of joining by moving the rotating tool while rotating it is applied to the honeycomb panel, the honeycomb panel is deformed by the load of the rotating tool during welding. For this reason, when the face plate or the core material such as the honeycomb panel is thin, joining is difficult. In particular, the surface of the joint is dented by friction between the rotating tool and the honeycomb panel surface. For this reason, since the thickness of a junction part substantially reduces, the intensity | strength of a junction part falls and there exists a problem in the point of reliability. In Japanese Patent Laid-Open No. 10-52772, a drawn rod-shaped mold material made of a material substantially harder than the material of the honeycomb panel is inserted into the joint portion of the honeycomb panel, and moved while rotating the rotary tool. This is a joining method that uses frictional heat between the generated rotating tool and the honeycomb material, and a technique is proposed in which a reinforcing material is provided at the joint portion of the honeycomb panel and the reinforcing material is also joined at the same time. The joint of the face plate is strengthened by the friction stir welding while maintaining the strength by holding the pressing force of the rotary tool with the rod-shaped mold material when joining with the pull-out bar mold. Is described. And in Unexamined-Japanese-Patent No. 10-52772, a faceplate and a core material are joined and a honeycomb panel structure is comprised. That is, in Japanese Patent Laid-Open No. 10-52772, when manufacturing a honeycomb panel structure, the core plate prevents the face plate from being deformed by the load of the rotating tool (tool), and even when the face plate is thin, friction is caused. Stir welding is possible. Furthermore, in Japanese Patent Laid-Open No. 10-52772, the surface of the joint is prevented from being dented due to plastic flow caused by frictional stirring between the rotary tool and the face plate surface, thereby preventing the strength of the joint from being lowered. .

  By the way, the above-mentioned two-sided structure (double skin panel) is not only the shape of the panel is inevitably restricted, but also the long shape as long as the panel body is a production printed matter with a combination of extruded mold materials. In order to manufacture a panel, in order to manufacture a mold material by extrusion, a large press machine is required, and the manufacturing cost and period of a die are also increased. For this reason, when manufacturing long extrusion mold materials before friction joining, the manufacturing cost and period of the extrusion become uselessly large, and a mold material that requires a die having a specific shape is required. Manufacturing costs will increase significantly.

  The core material used in Japanese Patent Application Laid-Open No. 10-52772 is also an extruded material. When a long core material is extruded and formed, the facility space becomes unavoidably long. Furthermore, in this publication, the core material prevents the deformation of the face plate that occurs during the friction stir welding and the strength reduction of the joined portion, but the face plate is strongly pressed by the shoulder portion of the tool during the friction stir welding. However, depending on the shape of the core material, a sufficient reinforcing effect cannot be obtained, an excessive pressing force is applied to the face plate, and the core material side may be deformed.

  Further, as in Japanese Patent Application Laid-Open No. 10-52772, simply by arranging the core material, if the face plate is deformed by frictional heat generated at the time of friction stir welding, the joint portion is deformed and the space between the face plates is changed. There is a problem that the gap (gap) is shifted, and as a result, the friction stir welding cannot be performed with high accuracy.

  An object of the present invention is to provide a two-sided structure (double skin panel) such as a long hollow mold material and the like, which is inexpensive and good in joining accuracy, and a friction stir welding method for manufacturing the two-sided structure.

The present invention relates to a workpiece comprising a plurality of combined mold members using a tool having a circular shoulder surface for applying frictional heat to a workpiece and a probe inserted from the shoulder surface along a workpiece joining line. In a two-sided structure formed by friction stir welding of objects,
A substantially L-shape having one vertical pressing facing wall and a horizontal support surface extending horizontally on one side above and below the facing wall, the other end of the supporting surface opposite to the facing wall being open The workpieces are formed by combining the mold materials upside down so that the horizontal free end of the one mold material engages with the upper part of the vertical pressing opposing wall of the other mold material, and on the workpiece joining line. The width of the one vertical pressing opposing wall located is set to a width larger than the diameter of the shoulder, and at the free end and notch of the engaging portion located at least on one side of the mold, a key is provided. A fitting piece portion and a fitting groove that are fitted in a mold shape are provided, and the one vertical pressing opposing wall of the workpiece in which the mold materials are combined is fixedly fitted in the width direction, and the probe the center of rotation of, set on the contact surface of the fitting piece and the fitting groove of the vertical pressing opposing walls , In two-sided structure, characterized by comprising formed by friction stir welding a workpiece made of the mold member to each other by the rotation of the probe.

In addition, the combined mold materials are combined with each other using a tool having a circular shoulder surface that imparts frictional heat to the workpiece and a probe that is inserted along the workpiece joining line that is positioned on the mold material combined from the shoulder surface. In the method for producing a two-sided structure formed by friction stir welding,
The workpiece has one vertical pressing opposing wall and a horizontal supporting surface extending horizontally on one side of the opposing wall, and the other end of the supporting surface opposite to the opposing wall is open. The substantially L-shaped mold members are turned upside down so that the horizontal free end of the one workpiece is engaged with the upper portion of the vertical pressing opposing wall of the other workpiece, Fitting that fits in a key shape at the free end and notch of the engaging part located at least on one side of the mold, with the plate width set to be larger than the diameter of the shoulder The one vertical pressing opposing wall of the work piece provided with the one part and the fitting groove and combining the mold materials is fixedly fitted in the width direction, and the rotation center of the probe is set as the vertical pressing opposing wall. set on the contact surface of the fitting piece and the fitting groove of, composed of the mold member to each other by the rotation of the probe The workpiece was friction stir welding in a manufacturing method of a dihedral structure characterized.

  In this way, there is no surface deformation even if the shoulder is pressed strongly against the surface of the joint, and not only can the friction stir welding be performed by heat input with sufficient stirring to the inside, but also easily and inexpensively. A structure can be manufactured.

  The present invention is a device for effectively producing a two-sided structure, in particular, a hollow box-shaped member having a square shape, using a press-molded product, and fitting an L-shaped mold material formed by press molding upside down. If it becomes, it becomes a box shape. When the L-shaped mold member is combined so that the free end of the horizontal surface of the workpiece is engaged with the upper part of the vertical pressing opposing wall of another workpiece, and the frictional bonding is performed from the engagement position, the pressing force from the shoulder surface Is received by the one vertical pressing opposing wall, and a vertical opposing wall that can withstand the pressing force is formed by setting the width between the one vertical pressing opposing walls to be larger than the diameter of the shoulder. it can.

  For example, in the case of a substantially L-shaped member in which a notch is provided at the free end engaging position of the vertical pressing facing wall, the fitting position with the free end is flattened by the notch and joined by frictional heat. The gap (gap) of the part is not deformed, and good friction stir welding can be performed.

  In the present invention, it is preferable that a fitting concavo-convex portion is provided at least at the free end and the notch of the engaging portion positioned on at least one of the upper and lower sides so as to be fixedly fitted in the width direction.

  As a result, the free end and the free end and the notch are not moved in the width direction due to the fitting unevenness, so that thermal deformation does not occur in the length direction during the friction stir welding.

  In the present invention, the upper surface of the engagement position may be a projecting flat surface having a width region larger than a shoulder diameter in the combination of the free end and the notch upper surface.

  As a result, the gap formed by the friction stir welding is filled with the projecting flat surface and becomes substantially flush, and post-processing is easy.

  According to the present invention, the substantially L-shaped long mold members are turned upside down so that the horizontal free end of the one workpiece is engaged with the upper part of the vertical pressing opposing wall of the other workpiece. When performing friction welding from the joint position, the pressing force from the shoulder surface is received by one vertical pressing opposing wall, and the width between the vertical pressing opposing walls is set to be larger than the diameter of the shoulder. Therefore, there is an effect that the friction stir welding can be performed without the gap (gap) of the joint portion being deformed by the frictional heat.

  In particular, the present invention is a device for effectively producing a hollow-shaped hollow box-shaped member with a press-molded product, and if the L-shaped mold material formed by press molding is fitted upside down, the box shape It becomes. When the L-shaped mold member is combined so that the free end of the horizontal surface of the workpiece is engaged with the upper part of the vertical pressing opposing wall of another workpiece, and the frictional bonding is performed from the engagement position, the pressing force from the shoulder surface Is received by the one vertical pressing opposing wall, and a vertical opposing wall that can withstand the pressing force is formed by setting the width between the one vertical pressing opposing walls to be larger than the diameter of the shoulder. it can.

  For example, in the case of a substantially L-shaped member in which a notch is provided at the free end engaging position of the vertical pressing facing wall, the fitting position with the free end is flattened by the notch and joined by frictional heat. The gap (gap) of the part is not deformed, and good friction stir welding can be performed.

  In the present invention, it is preferable that a fitting concavo-convex portion is provided at least at the free end and the notch of the engaging portion positioned on at least one of the upper and lower sides so as to be fixedly fitted in the width direction.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

  The present invention will be described below with reference to the drawings. It should be noted that the dimensions, materials, shapes, relative arrangements, etc. of the components described in the illustrated examples are not intended to limit the scope of the present invention, but are merely illustrative examples, unless otherwise specified. Absent.

  A reference example of the present invention will be described with reference to FIG. Here, a lower length that similarly extends in the length direction with respect to an upper long flat plate (first flat plate) 11 that extends in the length direction (a direction (longitudinal direction) from the front side to the back side in FIG. 1). The flat plate (second flat plate) 12 is friction stir welded using a rib member (channel member: third member) 13 extending in the length direction to form a two-sided structure (hollow mold). The upper long flat plate 11 and the lower long flat plate 12 are plate members extending in the longitudinal direction, and are, for example, flat plates of about 25 meters. The rib members 13 are arranged at a predetermined interval in a direction orthogonal to the length direction (two rib members 13 are shown in FIG. 1). The flat plate 11 and the lower long flat plate 12 are defined at a predetermined specified interval. Then, as will be described later, the rib member 13 is joined to the upper long flat plate 11 and the lower long flat plate 12 by friction stir welding. The upper long flat plate 11 and the lower long flat plate 12 are made of, for example, an aluminum alloy, and the rib member 13 is, for example, a press-formed member or a mold made of an aluminum alloy.

  As shown in FIG. 1, each rib member 13 has a substantially U-shaped cross section, and each rib member 13 has flange portions 13a and 13b and a channel portion 13c that connects the flange portions 13a and 13b. The flange portions 13a and 13b extend in the length direction and protrude in a direction perpendicular to the length direction. The channel portion 13c extends in the length direction.

  Here, referring also to FIG. 2, when the upper long flat plate 11 and the lower long flat plate 12 are joined by the rib member 13 to form a hollow mold material, the lower long flat plate 12 is attached to a gantry (not shown). The rib member 13 is placed on the lower long flat plate 12 at a predetermined interval in this state. At this time, the flange portion 13 b comes into contact with one surface (back surface) of the lower long flat plate 12. Thereafter, the upper long flat plate 11 is disposed on the rib member 13 (in this case, the flange portion 13a abuts against the back surface of the upper long flat plate 11). And the rib member 13 and the upper elongate flat plate 11 are fixedly supported by a support body (not shown).

  As shown in FIG. 1, the tool 21 is provided with a shoulder portion 21a and a pin (probe) 21b provided on the shoulder portion 21a. The shoulder portion 21a has a circular shoulder surface. Then, frictional heat is applied to the workpiece by the circular shoulder surface. On the other hand, the probe 21b is inserted along the joining line (joining part) of the workpiece. Now, let B be the diameter (diameter) of the shoulder portion 21a, that is, the circular shoulder surface, and P be the length of the probe 21b. Further, the distance from the one surface of the rib member 13 (the right side surface in FIG. 2) to the tips (outer surfaces) of the flange portions 13a and 13b (that is, the width of the contact surface of the rib member 13) is A, the upper elongated flat plate 11 and When the thickness of the lower long flat plate 12 is C and the thickness of the flange portions 13a and 13b is D, A ≧ B is defined as shown in FIG. Further, it is defined as C <P <(C + D).

  When performing friction stir welding, the probe 21b is inserted into the upper long flat plate 11 at a position corresponding to the center line of a predetermined direction (longitudinal direction) of the flange portion 13a while rotating the tool 21. Then, the tool 21 is moved along the joining portion (indicated by a broken line in FIG. 1) (in the direction indicated by the solid arrow in FIG. 1). When the friction stir welding is performed, the shoulder portion 21a (circular shoulder surface) is strongly pressed against the upper long flat plate 11, but as described above, since A ≧ B, this pressing is performed. All the force is received by the rib member 13. Furthermore, since C <P <(C + D), the probe 21b reaches at least the interface between the upper elongated flat plate 11 and the flange portion 13a. In the friction stir welding, for example, the rotational speed of the tool 21 is set to 800 to 2000 rpm, and the feed speed (moving speed of the tool 21) is set to 100 to 1000 mm / min.

  In this way, after the upper elongate flat plate 11 and the rib member 13 are friction stir welded, they are reversed, and the lower elongate flat plate 12 and the rib member 13 are similarly friction stir welded.

  When friction stir welding is performed using the tool 21 as described above, the upper long flat plate 11 and the upper long flat plate 12 are friction stir welded to the rib member 13 and the joint, respectively. A bonding bead (not shown) is formed. The depth of the bonding bead is determined by the length of the probe 21b inserted into the bonding portion.

  In the above example, a rib member having a U-shaped cross section is used as the rib member. However, as shown in FIG. 3A, an H-shaped material having an H-shaped cross section may be used. In this case, the length A in the orthogonal direction (width: the length in the direction orthogonal to the length direction) A of the first and second flange portions is A ≧ B. Furthermore, as shown in FIG. 3B, a hollow rectangular tube member that extends in the longitudinal direction with a cross-sectionally R shape may be used as the rib member 13. At this time, when the width of the hollow rectangular tube member is A, the thickness of the rectangular tube member is D, and the thicknesses of the upper long plate 11 and the lower long plate are C, A ≧ B (B is the diameter of the shoulder portion 21a). ), C <P <(C + D) (P is the length of the probe 21b). Even when such a square tube member is used as the rib member 13, the wall surface extending in the vertical direction of the square tube member functions as a channel portion, so that the pressing force by the tool 21 (that is, the shoulder portion 21a) is supported. Can do.

  As described above, in the reference example of the present invention shown in FIGS. 1 to 3, when obtaining a two-sided structure such as a hollow mold material, at least the rib member 13 is molded by press molding or a mold material. 11 and the lower long flat plate 12 and the rib member 13 are long members, a two-sided structure such as a hollow mold can be easily and inexpensively manufactured.

  Furthermore, since the width of the flange portions 13a and 13b of the rib member 13 is equal to or larger than the diameter of the shoulder portion 21a, when the friction stir welding is performed, all of the pressing force by the shoulder portion 21a can be received by the rib member. 11 and the lower long flat plate 12 can be strongly pressed, and the friction stir welding can be performed with high accuracy. Moreover, if the arrangement interval of the rib members 13 is appropriately changed, the shape of the hollow mold (change of the volume of the space portion) can be easily performed. Moreover, when the rib member 13 is formed at least by press molding, the manufacturing equipment for the rib member 13 can be shortened.

  Next, referring to FIG. 4A, a member 32 that similarly extends in the length direction with respect to the member 31 that extends in the length direction (the direction from the front side to the back side of the paper surface in FIG. 4A). Will be described as a hollow mold material. The members 31 and 32 are long plate members extending in the length direction, for example, members of about 25 meters. The members 31 and 32 are, for example, aluminum alloy press-molded members or extrusion mold materials.

  The members 31 and 32 have at least a substantially U-shaped cross section, and the member 31 connects a pair of plate portions (horizontal support surfaces) 31a and 31b and plate portions 31a and 31b extending in the length direction at one end thereof. A plate portion (vertical pressing opposing wall) 31c is provided, and the plate portion 31c extends in the length direction and is orthogonal to the length direction. Similarly, the member 32 has a pair of plate portions (horizontal support surfaces) 32a and 32b extending in the length direction and a plate portion (vertical pressing opposing wall) 32c that connects the plate portions 32a and 32b at one end thereof. The plate portion 32c extends in the length direction and is orthogonal to the length direction.

  As shown in the figure, the plate portions 31c and 32c are in contact with each other (in a butted state) and placed on a gantry (not shown) and fixed so as not to move. Now, assuming that the total thickness of the plate portion 31c and the plate portion 32c is A, that is, if the thickness (total thickness) of the pair of vertical pressing opposing walls is A, then A ≧ B (B is the shoulder portion 21a). Diameter).

  When performing friction stir welding, while rotating the tool 21, the probe 21b is inserted into the joining portion, that is, the contact surface between the plate portion 31c and the plate portion 32c, and along the joining portion (FIG. 4 ( In a), the tool 21 is moved in a direction from the front side to the back side of the drawing. At this time, the rotation center of the probe 21b is between the plate portions 31c and 32c. In the friction stir welding, the shoulder portion 21a is pressed against the plate portions 31c and 32c. In the friction stir welding, for example, the rotational speed of the tool 21 is set to 800 to 2000 rpm, and the feed speed (moving speed of the tool 21) is set to 100 to 1000 mm / min.

  When the friction stir welding is performed using the tool 21 as described above, the members 31 and 32 are friction stir welded at the joint, and a joint bead (not shown) is formed at the joint. . The center of the width of the bonding bead is located on the extension line of the contact surfaces of the plate portions 31c and 32c. The depth of the joining bead is determined by the length of the probe 21b inserted into the joining portion.

  As described above, after friction stir welding is performed on one end surface side of the plate portions 31c and 32c, the other end surface side is friction stir welded in the same manner. Furthermore, the other end side (the end portion opposite to the plate portions 31c and 32c) of the members 31 and 32 is friction stir welded using a fluid tube to be described later.

  As described above, in the reference example of the present invention shown in FIG. 4A, when the members 31 and 32 are joined, the total thickness of the plate portions 31c and 32c ≧ the diameter of the shoulder portion 21a. At this time, all the pressing force by the shoulder portion 21a can be received by the plate portions 31c and 32c, so that the members 31 and 32 can be strongly pressed, and the friction stir welding can be performed with high accuracy.

  Furthermore, if the members 31 and 32 are formed by press molding, it is possible to easily and inexpensively manufacture a two-sided structure such as a hollow mold material considering that the members 31 and 32 are long members. . As shown in FIG. 4 (b), even when the members 31 and 32 are extrusion-type members (that is, so-called double skin materials) having the core materials 31d and 32d, the members 31 and 32 are formed by the plate portions 31c and 32c. And the friction stir welding may be performed as described above.

  Next, referring to FIG. 5, a member 42 that similarly extends in the length direction is joined to an H-shaped member 41 that extends in the length direction (in FIG. 5, the direction from the front side to the back side of the drawing). The case of using a hollow mold will be described. The members 41 and 42 are long materials extending in the length direction, for example, members of about 25 meters. The members 41 and 42 are, for example, aluminum alloy press-molded members or extrusion mold members.

  The members 41 and 42 have at least a substantially H-shaped cross section, and the member 41 is a plate that connects a pair of plate portions (horizontal support surfaces) 41a and 41b extending in the length direction and the plate portions 41a and 41b at one end thereof. Part (vertical wall) 41c. The plate part 41c extends in the length direction and is orthogonal to the length direction. Similarly, the member 42 has a pair of plate portions (horizontal support surfaces) 42a and 42b extending in the length direction and a plate portion (vertical wall) 42c that connects the plate portions 42a and 42b at one end thereof. The plate portion 42c extends in the length direction and is orthogonal to the length direction. In addition, a horizontal support surface may continue to plate part 41c and 42c.

  As shown in the drawing, one end portion of the plate portion 41a and one end portion of the plate portion 42a are brought into contact with each other, and one end portion of the plate portion 41b and one end portion of the plate portion 42b are brought into contact with each other on a mount (not shown). And fixed so as not to move. Thereafter, the fluid inclusion body is disposed in the hollow space. This fluid inclusion body is formed of a non-inflatable material having a flexible outer casing. For example, the fluid inclusion body is a fluid tube body made of a flexible but non-expandable material extending along the joining position. For example, a fire hose formed by wrapping a cloth material around the surface of a rubber hose may be used as the fluid tube body.

  And in the reference example of this invention, the flexible fluid tube 43 extended in a length direction along a joining line is extended and arrange | positioned in hollow space like illustration. The fluid tube 43 is filled with a fluid such as water, air, or nitrogen and sealed. As the fluid, for example, water or air is used, and the pressure is determined based on the pressing force of the shoulder. When the fluid is flowed and filled in the fluid tube 43 at a predetermined pressure, the fluid tube 43 expands into a circular cross section, and a support surface that supports the abutting portion between the plate portion 41a and the plate portion 42a is formed. The fluid filling pressure is determined based on the pressing force by the tool 21. That is, the fluid tube 43 is filled with the fluid with a filling pressure that is elastically deformed (to the extent that it does not dent) against the pressing force of the tool 21.

  The surface with which the fluid tube 43 abuts against the plate portions 41a and 42a extends in the joining line direction with the butted portion as the center, and is further flattened in the direction perpendicular to the joining line direction with the butted portion as the center. Now, assuming that the contact width in the flat part is A, A ≧ B (B is the diameter of the shoulder part 21a). If the thickness of the plate portions 41a and 42a is D, then D> P (P is the length of the probe 21b).

  When performing friction stir welding, while rotating the tool 21, the probe 21b is inserted into the joining portion, that is, the contact surface between the plate portion 41a and the plate portion 42a, along the joining portion (in FIG. 5). The tool 21 is moved in a direction from the front side to the back side of the paper. At this time, the rotation center of the probe 21b is between the plate portions 41a and 42a. When the friction stir welding is performed, the shoulder portion 21 a is pressed against the plate portions 41 a and 42 a, and this pressing force is supported by the fluid tube 43. In the friction stir welding, for example, the rotational speed of the tool 21 is set to 800 to 2000 rpm, and the feed speed (moving speed of the tool 21) is set to 100 to 1000 mm / min.

  When friction stir welding is performed using the tool 21 as described above, the members 41 and 42 are friction stir welded at the joint, and a joint bead (not shown) is formed at the joint. . The center of the width of the bonding bead is located on the extension line of the contact surfaces of the plate portions 41a and 42a. The depth of the joining bead is determined by the length of the probe 21b inserted into the joining portion.

  As described above, after friction stir welding is performed on one end face side of the plate portions 41a and 42a, the plate portions 41b and 42b are friction stir welded in the same manner.

  As described above, in the example shown in FIG. 5, when the members 41 and 42 are joined, the fluid tube 43 is inserted into the hollow space, and the joined portion is supported by the fluid tube 43. Since the width supporting the joint at the portion ≧ the shoulder portion 21a is made larger than the hollow portion inscribed space of the hollow mold material, all the pressing force by the shoulder portion 21a can be received by the fluid tube 43 during the friction stir welding. As a result, the members 41 and 42 can be strongly pressed, and the friction stir welding can be performed with high accuracy.

  Furthermore, if the members 41 and 42 are formed as extrusion molds, considering that the members 41 and 42 are long members, a two-sided structure such as a hollow mold material can be easily and inexpensively manufactured. In the example shown in FIG. 4, when joining the other ends of the members 31 and 32 (ends opposite to the plate portions 31 c and 32 c), the fluid tube 43 is used to support the joint and friction stir Bonding can also be performed.

  An embodiment of the present invention will be described with reference to FIG. Similarly, a member (long mold material) 52 extending in the length direction is joined to a member (long mold material) 51 extending in the length direction (the direction from the front side to the back side in FIG. The case of using a mold material will be described. The members 51 and 52 are long plate members extending in the length direction, for example, plate members of about 25 meters. The members 51 and 52 are, for example, extruded mold members made of an aluminum alloy.

  The members 51 and 52 have at least a substantially L-shaped cross section, and the member 51 extends in a length direction to a plate portion (horizontal support surface) 51a and extends in the length direction and is continuous to one end of the plate portion 51a. It has the board part (vertical press opposing wall) 51b orthogonal to a direction. And the other extension other side of the board part 51a is opening. Similarly, the member 52 includes a plate portion (horizontal support surface) 52a extending in the length direction, a plate portion (vertical pressing facing wall) 52b extending in the length direction and continuous to one end of the plate portion 52a and orthogonal to the length direction. The other end of the opposite side of the plate portion 52a is open. Key-shaped fitting pieces 51c and 52c extending in the length direction are formed at the front ends of the plate portions 51a and 52a, respectively, and the front ends (one end portions) of the plate portions 51b and 52b have a length. Fitting grooves 51d and 52d extending in the direction are formed. The fitting piece portion 51c is fitted into the fitting groove 52d, and the fitting piece portion 52c is fitted into the fitting groove 51d to form a hollow mold having a square cross section. At this time, the abutting portions of the plate portions 51a and 52b are planar, and similarly, the abutting portions of the plate portions 51b and 52a are planar. That is, the workpiece has one vertical pressing facing wall and a horizontal support surface extending horizontally on one side of the vertical pressing pressure facing wall, and the other end of the horizontal support surface on the opposite side of the facing wall. The substantially L-shaped long-shaped members that are open are turned upside down and are combined so that the horizontal free end engages with the upper part of the vertical pressing opposing wall of another workpiece.

  As described above, in a state where the members 51 and 52 are fitted, they are placed on a gantry (not shown) and fixed so as not to move. Now, assuming that the thickness (width) of the plate portions 51b and 52b is A, A ≧ B (B is the diameter of the shoulder portion 21a).

  When performing friction stir welding, while rotating the tool 21, the probe 21b is inserted into the joining portion, that is, the contact surface between the fitting piece portion 51c and the fitting groove 52d, and along the joining portion ( In FIG. 6, the tool 21 is moved in a direction from the front side to the back side of the drawing. At this time, the rotation center of the probe 21b is between the fitting piece 51c and the fitting groove 52d. In the friction stir welding, the shoulder portion 21a is pressed against the plate portions 51a and 52b. As described above, since A ≧ B, this pressing force is supported by the plate portion 52b. become. In the friction stir welding, for example, the rotational speed of the tool 21 is set to 800 to 2000 rpm, and the feed speed (moving speed of the tool 21) is set to 100 to 1000 mm / min.

  As described above, when friction stir welding is performed using the tool 21, the members 51 and 52 are friction stir welded at the joint, and a joint bead (not shown) is formed at the joint. . The center of the width of the joining bead is located on the extended line of the contact surface between the fitting piece 51c and the fitting groove 52d. The depth of the joining bead is determined by the length of the probe 21b inserted into the joining portion.

  As described above, after the plate portions 51a and 52b are friction stir welded, the plate portions 51b and 52a are friction stir welded in the same manner.

  As described above, in the example shown in FIG. 6, when the members 51 and 52 are joined, the thickness of the plate portions 51b and 52b (that is, the vertical pressing opposing wall) ≧ the diameter of the shoulder portion 21a. At this time, all the pressing force by the shoulder portion 21a can be received by the plate portion 51b or 52b. As a result, the joint portion can be strongly pressed, and the friction stir welding can be performed with high accuracy. If the thicknesses of the plate portions 51a and 52a are D, it is desirable that P (P is the length of the probe 21b) ≧ D.

  Furthermore, if the members 51 and 52 are formed by press molding or extrusion, a two-sided structure such as a hollow mold can be easily and inexpensively manufactured considering that the members 51 and 52 are long members. become.

  Further, as described above, since the members 51 and 52 are fitted, even if the members 51 and 52 are to be deformed by frictional heat, they cannot be deformed, and as a result, a gap (gap) at the joint is formed. Good deformation stir welding can be performed without deformation.

  As shown in FIG. 7, a convex portion (projecting flat surface) 61 may be provided at the joint, and if the convex portion 61 is provided in this way, a recess is formed on the surface of the joint at the time of friction stir welding. There is nothing you can do. That is, the strength of the joint portion does not decrease. When the width of the convex portion 61 is C, C ≦ B is defined. In this way, the convex portion 61 does not protrude from the shoulder portion 21a during the friction stir welding.

  Further, as shown in FIG. 8, a locking portion (locking groove) 63 extending in the length direction is formed at one end portion of the plate portion 52b, and one end portion of the plate portion 51a is locked to the locking portion 63. You may do it. That is, you may make it provide a notch in the free end engagement position of a vertical press opposing wall. Even in this case, since the fitting piece 52c is fitted in the fitting groove 51d, even if the members 51 and 52 are deformed by frictional heat, they cannot be deformed. (Gap) is not deformed and good friction stir welding can be performed.

  Furthermore, as shown in FIG. 9, a tapered surface 62 may be formed at one end (the end where the fitting groove is formed) of the plate portions 51b and 52b. In this case, the strength at the joint can be increased.

  In addition, as shown in FIG. 10, a locking portion (locking groove) 63 extending in the length direction is formed at one end portion of the plate portion 52 b, and one end portion of the plate portion 51 a is locked to the locking portion 63. You may make it do. Even in this case, since the fitting piece 52c is fitted in the fitting groove 51d, even if the members 51 and 52 are deformed by frictional heat, they cannot be deformed. (Gap) is not deformed and good friction stir welding can be performed.

  Further, as shown in FIG. 11, fitting members 64 and 65 having L-shaped cross sections extending in the length direction are formed in the plate portions 51b and 52b, respectively, to form fitting grooves. The protrusions 66 and 67 may be formed on the surfaces facing each other, and the protrusions 67 and 66 may be fitted to the fitting bodies 64 and 65. In addition, as shown in FIG. 12, you may make it provide the convex part 61 in a junction part.

  Further, as shown in FIG. 13, a locking portion (locking groove) 63 extending in the length direction is formed at one end portion of the plate portion 52b, and one end portion of the plate portion 51a is locked to the locking portion 63. You may do it. Also in this case, since the protrusion 67 is fitted to the fitting body 64, even if the members 51 and 52 are deformed by frictional heat, they cannot be deformed. As a result, the gap (gap) of the joint portion is not obtained. No deformation occurs, and good friction stir welding can be performed. In addition, as shown in FIG. 14, you may make it provide the convex part 61 in a junction part. Further, as shown in FIG. 15, a tapered surface 62 may be formed, and as shown in FIG. 16, the tapered surface 62 may be formed and the convex portion 61 may be formed. At this time, it is desirable to define E> P, where E is the distance from the upper surface of the plate portion 51a to the lower end of the tapered surface 62.

  Moreover, as shown in FIG. 17, if the several member 71 is fitted using the fitting groove 71a and the fitting piece part 71b, a several stirring part can be simultaneously friction-stir-joined. At this time, one end of the member 71 may be locked using a locking portion 63 as shown in FIG.

  As described above, according to the present invention, there are provided a two-sided structure (double skin panel) such as a long hollow mold material that is inexpensive and has good joining accuracy, and a friction stir welding method for manufacturing the two-sided structure. I can do it.

It is a perspective view which shows the 1st example of the hollow type material which is a two-sided structure by the reference example of this invention with a tool. It is sectional drawing of the hollow mold material of the reference example of this invention shown in FIG. It is sectional drawing which shows the 2nd example of the hollow type material which is a two-sided structure by the reference example of this invention, (a) is sectional drawing which shows a hollow type material at the time of using H-shaped material as a rib member, (b) ) Is a cross-sectional view showing a hollow mold material when a square tube member is used as a rib member. It is sectional drawing which shows the 3rd example of the hollow type | mold material which is a two-sided structure by the reference example of this invention, (a) is sectional drawing which shows the state which carried out the friction stir welding of the member which has a cross-sectional substantially U shape, b) is a cross-sectional view showing a state in which a double skin member having a core material is friction stir welded. It is sectional drawing which shows the 4th example of the hollow type material which is a two-sided structure by the reference example of this invention. It is sectional drawing which shows the 5th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 6th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 7th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 8th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 9th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 10th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 11th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 12th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 13th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 14th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 15th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 16th example of the hollow type material which is a two-sided structure by this invention. It is sectional drawing which shows the 17th example of the hollow type material which is a two-sided structure by this invention.

Explanation of symbols

11 Upper long flat plate (first flat plate)
12 Lower long flat plate (second flat plate)
13 Rib member (channel member)
21 Tool 31, 32, 41, 42, 51, 52, 71 Member 43 Fluid tube 61 Convex part 62 Tapered surface 63 Locking part 64, 65 Fitting body 66, 67 Protrusion part

Claims (4)

Friction stir of a workpiece consisting of a plurality of combined molds using a tool having a circular shoulder surface for applying frictional heat to the workpiece and a probe inserted along the workpiece joining line from the shoulder surface In the two-sided structure formed by joining,
A substantially L-shape having one vertical pressing facing wall and a horizontal support surface extending horizontally on one side above and below the facing wall, the other end of the supporting surface opposite to the facing wall being open The workpieces are formed by combining the mold materials upside down so that the horizontal free end of the one mold material engages with the upper part of the vertical pressing opposing wall of the other mold material, and on the workpiece joining line. The width of the one vertical pressing opposing wall located is set to a width larger than the diameter of the shoulder, and at the free end and notch of the engaging portion located at least on one side of the mold, a key is provided. A fitting piece portion and a fitting groove that are fitted in a mold shape are provided, and the one vertical pressing opposing wall of the workpiece in which the mold materials are combined is fixedly fitted in the width direction, and the probe the center of rotation of, set on the contact surface of the fitting piece and the fitting groove of the vertical pressing opposing walls Dihedral structure characterized by comprising formed by friction stir welding a workpiece made of the mold member to each other by the rotation of the probe. Friction between the combined mold materials using a tool having a circular shoulder surface that imparts frictional heat to the workpiece and a probe that is inserted along the workpiece joining line located on the mold material combined from the shoulder surface In the method for producing a two-sided structure formed by stirring and joining,
The workpiece has one vertical pressing opposing wall and a horizontal supporting surface extending horizontally on one side of the opposing wall, and the other end of the supporting surface opposite to the opposing wall is open. The substantially L-shaped mold members are turned upside down so that the horizontal free end of the one workpiece is engaged with the upper portion of the vertical pressing opposing wall of the other workpiece, Fitting that fits in a key shape at the free end and notch of the engaging part located at least on one side of the mold, with the plate width set to be larger than the diameter of the shoulder The one vertical pressing opposing wall of the work piece provided with the one part and the fitting groove and combining the mold materials is fixedly fitted in the width direction, and the rotation center of the probe is set as the vertical pressing opposing wall. set on the contact surface of the fitting piece and the fitting groove of, composed of the mold member to each other by the rotation of the probe Method for producing a two-sided structure, characterized in that the workpiece was friction stir welding.   The method for manufacturing a two-sided structure according to claim 2, wherein the mold material is a substantially L-shaped member in which a notch is provided at a free end engaging position of the vertical pressing facing wall. The upper surface of the engagement position between the mold members is formed by a combination of the free end and the upper surface of the notch, and the upper surface of the engagement position is a projecting flat surface having a width region larger than a shoulder diameter. The manufacturing method of the two-sided structure of Claim 3.

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