JP2005246483A - Manufacturing method of car body by friction stir joining process, and car body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve good joining at butted sections between an underframe and a side body structure or between the side body structure and a roof body structure of a car body, even if the gap between butted sections is large. <P>SOLUTION: Two members 10, 20 ( an underframe and a side body structure, or the side body structure and a roof body structure) are cut along their butted sections ( the butted sections between the underframe and the side body structure or between the side body structure and the roof body structure) with a cutting tool 60. Filling material 30 is inserted into a gap 40 produced by the cutting, and protrusions 12, 22 are pressed with a roller 70 and caulked so that the filling material 30 is fixed. Next, friction stir joining is performed for the protrusions 12, 22 and the filling material 30 with a rotating tool 80. The filling material may be filled into the gap by welding without cutting. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a friction stir welding method. In particular, the present invention relates to a joining method suitable for manufacturing a vehicle traveling on a rail, for example, a vehicle body of a railway vehicle.

  The friction stir welding method is a method in which a round bar (referred to as a rotary tool) inserted in a joint is moved along a joining line while rotating, the joint is heated and softened, plastically flowed, and solid phase joining is performed. A rotary tool consists of a large diameter part and a small diameter part. The small diameter portion is inserted into the member to be joined, and the end surface of the large diameter portion is brought into contact with the member. A screw is provided in the small diameter portion. A convex portion is provided at the abutting portion of the two members to be joined, and a rotary tool is inserted from the convex portion side so that the gap between the two members is filled with the metal of the convex portion. The large diameter part of the rotary tool is placed in the convex part. Friction stir welding of hollow shape members is performed by friction stir welding of hollow shape members using a connecting plate connecting two face plates as a support plate. These are shown in Patent Document 1 and Patent Document 2.

Moreover, in FIG. 14 of patent document 3, the filler is arrange | positioned in the clearance gap between two members, and friction stir welding is carried out. Further, in Patent Document 4, when friction stir welding is performed on a first member having a convex portion and a second member not having a convex portion, build-up welding is intermittently performed on the second member side, and then friction is performed. Stir welding.
Japanese Patent No. 3070735 (USP 6050474) JP2000-334581A (EP1055478A1) JP 2000-233285 A Japanese Unexamined Patent Publication No. 2000-167777 (EP09931414A2)

  If there is a gap between the two members to be joined, friction stir welding cannot be performed. For this reason, a convex part is provided on the insertion side of the rotary tool, and the gap is filled with the metal of the convex part. However, in reality, for example, when the gap is 1 mm or more, it is difficult to perform good bonding. Although it is conceivable to increase the diameter of the rotary tool when the gap becomes large, inconvenience is likely to occur.

A vehicle body of a rail vehicle such as a railway vehicle includes a side structure that forms a side surface in the vehicle, a roof structure, and a frame that forms a floor. The vehicle body is manufactured by first joining a plurality of extruded shapes to manufacture a side structure, a roof structure, and a frame. Next, these are joined to form a vehicle body. Since the side structure, the roof structure, and the frame are about 20 m long and about 3 m wide, the manufacturing error is large. For this reason, the gap between the joints is easily 1 mm or more.
An object of the present invention is to enable good bonding even when the gap is large.

  A second object of the present invention is to facilitate the friction stir welding between the underframe of the vehicle body and the side structure or the friction stir welding between the side structure and the roof structure.

  The purpose is to place a side structure on the underframe, weld the inside of the joint between the underframe and the side structure, and join the abutment between the outside of the underframe and the outside of the side structure. It can be achieved by performing friction stir welding along the joining line while cutting along the line and inserting a filling material into the gap generated by the cutting.

Friction stir welding between the underframe and the side structure for the second purpose can be easily performed since the faceplate of the underframe is used as a support means or a support device is disposed between the two side structures. It is.
The friction stir welding between the side structure and the roof structure is easily performed because the support device is disposed between the two side structures.

  According to the present invention, a member that fills the gap is disposed in the gap between the butted portions of the two members, and after that, friction stir welding is performed, so that good bonding can be achieved.

Friction stir welding between the frame of the vehicle body and the side structure can be easily performed because the face plate of the frame is used as a support means or a support device is disposed between the two side structures.
The friction stir welding between the side structure and the roof structure is easily performed because the support device is disposed between the two side structures.

First, a basic embodiment of the present invention will be described with reference to FIGS. In FIG. 1, the joining operation proceeds in the order of (A) to (D).
In FIG. 1 (A), two plate-like members 10 and 20 are put on a pedestal 50 and abutted against each other. The two members 10 and 20 are abutted so that the gap is as small as possible. The member 10 has a protruding piece 15 along the abutting portion with the member 20, and the member 20 is placed on the protruding piece 15. The members 10 and 20 are provided with convex portions 12 and 22 on the upper surface side of the abutting portion. In this state, the members 10 and 20 are fixed to the gantry 50 with a restraining tool (not shown). The members 10 and 20 are made of an aluminum alloy. The butted portion is called a joining line.

  After restraining as described above, the butted surfaces of the two members 10 and 20 are cut with the cutting tool 60 from above. As a result, a gap (groove) 40 having a certain width is formed on the abutting surface. The cutting width (gap, groove) 40 is larger than the gap generated when the members 10 and 20 are brought into contact with each other. The lower surface of the gap 40 (the lower surface of cutting) is up to the upper surface of the protruding piece 15. (Fig. 1 (A))

  The width of the two convex parts 12 and 22 is detected by a detector, and the center of the cutting tool 60 is positioned at the center thereof to perform cutting. The insertion depth of the cutting tool 70 is made constant by detecting the positions of the upper surfaces of the convex portions 12 and 22. Cutting is performed by dry cutting. The facet is blown away with compressed air or sucked with a dust collector. Although an end mill is shown in FIG. 1 as the cutting tool 60, a circular saw may be used.

  Next, the filling material 30 is disposed in the gap 40 generated by cutting. The height of the filling material 30 is such that the upper surface of the filling material 30 is positioned below the upper surfaces of the convex portions 12 and 22. The upper surface of the filling material 30 is located above the extension line of the upper surfaces of the plates 11 and 21 of the members 10 and 20 excluding the convex portions 12 and 22. The width of the filling material 30 is preferably as close as possible to the width of the gap 40 and is easy to insert. The difference between the width of the gap 40 and the width of the filling material 30 is less than 1 mm. (Fig. 1 (B), Fig. 2)

  Next, the upper surfaces of the convex portions 12 and 22 near the gap 40 are pressed from above, and the corner portions of the convex portions 12 and 22 are bent toward the gap 40 side. Accordingly, the filling material 30 is pressed downward and fixed to the members 10 and 20. This fixing is to prevent the filling material 30 from moving when the friction stir welding is performed by the rotary tool 80.

  This caulking work is performed by running the roller 70 along the gap 40. The tip of the roller 70 is trapezoidal. The center of the width of the roller 70 is located at the center of the two members 10 and 20 (center of the gap 40). The corners of the convex portions 12 and 22 are pressed by the trapezoidal slope of the roller 70. As a result, the corners of the convex portions 12 and 22 are caulked. The width of the two convex portions 12 and 22 is detected by a detector, and the center of the roller 70 is positioned at the center and pressed. The width of the two convex portions 12 and 22 is detected by a detector, and the center of the roller 70 is positioned at the center thereof. (Fig. 1 (B), Fig. 3)

  The roller 70 presses the convex portions 12 and 22 toward the groove 40 with a predetermined force by the air cylinder device 75. The cylinder device 75 is extendable and retractable so as to allow a change in the height position of the convex portions 12 and 22. If there is a temporarily welded bead described later, the roller 70 gets over it.

Next, the rotary tool 80 is inserted into the butted portion from above, and the members 10 and 20 and the filling material 30 are friction stir welded. The rotary tool 80 is moved along the joining line. The tip of the small diameter portion 82 of the rotary tool 80 reaches the protruding piece 15. The diameter of the small diameter portion 82 is larger than the width of the gap 40. The widths of the two convex portions 12 and 22 are detected by a detector, the center of the rotary tool 80 is positioned at the center thereof, and friction stir welding is performed. The insertion depth of the rotary tool 80 is made constant by detecting the positions of the upper surfaces of the convex portions 12 and 22. (FIGS. 1 (C), (D), FIG. 4)
After the friction stir welding, if necessary, the projections 12 and 22 above the upper surfaces of the plates 11 and 21 and the joint are cut and smoothed.

  An example of the size of each part will be described. The width of the gap 40: 3 mm, the depth of the gap 40 6 mm, the thickness of the plates 11, 21: 4 mm, the height of the projections 12, 22 (excluding the portions of the plates 11, 21): 2 mm, the projections 12, 22 Width: 8 mm, width of the filling material 30: 2.5 mm, height of the filling material 30: 5.5 mm, diameter of the large diameter portion 81 of the rotary tool 80: 15 mm, diameter of the small diameter portion 82: 6 mm, rotary tool 80 Inclination angle: 4 °. At the time of friction stir welding, the boundary between the large diameter portion 81 and the small diameter portion 82 (more precisely, the lowermost end of the large diameter portion 81) is located between the upper surfaces of the plates 11 and 21 and the upper surface of the filling material 30.

According to this, even if there is a gap of 1 mm or more along the joining line when the two members are butted together, the gap is enlarged to a predetermined gap by cutting, and then the filling material 30 is arranged to make the gap less than 1 mm. Next, since friction stir welding is performed, good bonding can be achieved. A gap between the portion 40 corresponding to the thickness of the plates 11 and 21 and the filling material 30 is filled with the metal on the convex portions 11 and 21 and the filling material 30 as a source.
If the filling material 30 is not sufficiently fixed only by caulking, the filling material 30 is intermittently temporarily welded to the convex portions 11 and 21 by arc welding.

The embodiment of FIG. 5 will be described. 61 is a circular saw as the cutting tool 60. At the rear of the circular saw 61, the facet is sucked by the suction port 65. Further, a rubber exclusion plate 66 prevents the facets from moving backward. The filling material 30 is wound around the drum 90. The filling material is smoothly bent into an arc shape from the drum 90 by the guide rollers 93 b, 93 c and 93 d, and is inserted into the gap 40 through the cylindrical guide 95. Such rollers 93b, 93c, 93d, and a guide 95 are appropriately provided between the drum 90 and the rollers. When the filling material 30 enters the gap 40, it is fixed by the roller 70 and friction stir welded by the rotary tool 80. These devices are installed on one truck. The drum 90 feeds the filling material 30 as the carriage travels.
When the protrusions 12 and 22 are caulked and the filling material 30 is fixed, first, the end of the filling material 30 may be fixed to the protrusions 12 and 22 by welding.

  In the above embodiment, the roller 70 for inserting the filling material 30 into the gap 40 and the roller 70 for caulking the convex portions 12 and 22 are the same, but both can be performed by respective rollers. The roller that inserts the filling material 30 into the gap 40 presses the upper surface of the filling material 30.

  In addition, although the protrusions 12 and 22 are crimped by the roller 70 and the filling material 30 is fixed, the upper surface of the filling material 30 may be pressed and fixed by the roller 70. The upper surface of the filling material 30 can be protruded from the upper surfaces of the convex portions 12 and 22. It is considered that a plurality of rollers 70 may be provided in the traveling direction of the carriage and firmly fixed.

  Moreover, although it carries out by pressing the convex parts 12 and 22 with the roller 70, it can carry out by hitting the two convex parts 12 and 22 intermittently. The member to be tapped has a small cross-sectional area as in the case of only. Further, the facet when the groove 40 is cut can be removed by blowing compressed air.

  When the hairline processing finish is performed after the friction stir welding and smoothing, the material of the filling material 30 may be the same as that of the base members 10 and 20. When using a filling material different from the base material and finishing the hairline without painting the welded part, the joint part is likely to be discolored and look bad. However, if the same material as the base material is used, the discoloration is small and the appearance is not bad.

  The embodiment of FIGS. 6 to 9 will be described. This is applied to the production of a rail vehicle, for example, the body of a railway vehicle. The vehicle body of the rail vehicle includes a base frame 110 that forms a floor, side structures 120 and 120 that form side surfaces, a roof structure 130 that forms a roof, and the like. First, the roof structure 130 is mounted on the upper parts of the pair of side structures 120, 120 and joined together. Next, this is placed on a frame and joined together. Here, the friction stir welding apparatus for the frame and the side structure will be described.

  The frame 110 is fixed on the frame 210. Side structures 120 and 120 are placed on the underframe 120. A roof structure 130 is joined to the upper parts of the side structures 120, 120. The side structures 120 and 120 and the roof structure 130 are joined and then placed on the underframe 120.

  The upper part of the side structure 120 is supported by the support device 230 from the side. The support device 230 is installed on a frame 220 installed along both side surfaces of the vehicle body. The support device 230 can be expanded and contracted in the horizontal direction. A support device 240 is disposed on the inner side of the vehicle body, and the interval and verticality between the pair of side structures 120, 120 are set to be predetermined. The support device 250 is between the upper part and the upper part of the side structures 120, 120, between the lower part and the lower part, and between the upper part and the lower part. The support device 240 is a support bar that increases the distance between the two side structures 120, 120, a chain that decreases the distance, or the like. Both have turnbuckles and can change the interval. Qian is pulling over the window. Further, the lower end of the side structure 120 is pressed from the vehicle outer side toward the vehicle inner side.

  There are joining devices 300, 300 on both side surfaces of the vehicle body. The upper and lower sides of the joining device 300 are supported by rails 301 and 302 and run linearly along the vehicle body. The joining device 300 is installed on the carriage 310. The joining device 300 is mounted on the lower rail 301 via a roller, and there are rollers in contact with the left and right surfaces of the rail. In addition, there are rollers in contact with the left and right surfaces of the upper rail 302 at the upper part of the joining device 300. The rail 302 is installed on the upper part of the frame 220.

  The joining apparatus 300 is the apparatus of the said Example. The joining device 300 is installed on the lifting platform 320 of the carriage 310. The elevator 320 is moved up and down by being guided by the left and right pillars of the rectangular frame of the carriage 310. A seat 330 that rotates in the vertical direction is provided on the top of the elevator table 320. On the upper surface of the rotary seat 330 is a seat 340 that moves in the horizontal direction. On the upper surface of the moving seat 340 is a seat 350 that moves up and down. The apparatus of the said Example is installed in this vertical moving seat 350,350. That is, the circular saw 61, its driving device, the suction port 65, the exclusion plate 66, the sensor and the like are installed in one seat 350. The other seat 350 is provided with rollers 70, 93b, 93c, 93d, a guide 95, a rotary tool 80, its driving device, a sensor, and the like. A drum 90 is installed on the top of the carriage 310.

Each of the sensors detects the width and position of the convex portion, moves the horizontal seat 340 and the vertical moving seat 350, and controls the positions and depths of the circular saw 61 and the rotary tool 80. The horizontal moving seat 340 changes the distance to the vehicle body.
The rotary seat 330 is used when the shape of the body of the part to be joined is inclined with respect to the vertical plane.

  In FIG. 9, a frame 110 and a side structure 120 are obtained by joining a plurality of hollow shapes. The face plates 121b and 121c of the hollow shape member 121 at the lower end of the side structure 120 are abutted against the hollow shape material 111 at the end of the frame 110. The hollow shape member 111 is called a side beam, and its height and plate thickness are larger than those of the other hollow shape members 112.

The face plate 121 c on the vehicle inner side is placed on the face plate 111 b on the upper surface of the hollow shape member 111. Both are substantially orthogonal. This butted portion is fillet welded by arc welding from the inside of the vehicle.
The face plate 121b on the outside of the vehicle is abutted against the concave portion 111d at the upper corner of the hollow shape member 111 and overlaps the concave portion 111d. This butted portion is friction stir welded from the outside of the vehicle.

  The concave portion 111d is located at a connection portion between the face plate 111b on the upper surface of the hollow shape member 111 and the vertical plate 111c on the outside of the vehicle. The concave portion 111d opens upward and outward of the vehicle. The recess 111d has a protruding piece 111f protruding upward. The protruding piece 111f overlaps the back surface of the face plate 121b.

  The center of the thickness of the circular saw 61, that is, the extension line of the axis of the rotary tool 80 is within the range of the thickness of the face plate 111b. As a result, the load at the time of friction stir welding is supported by the face plate 111b, the deformation of the bonded portion is prevented, and good bonding is possible.

The face plates 111b and 112b on the upper surfaces of the hollow members 111 and 112 of the frame 110 are substantially in the same plane. Convex portions 12 and 22 are provided on the vehicle outer side at the lower end of the face plate 121b and the vehicle outer side at the upper end of the connection plate 111c, respectively.
The configuration of the joint between the left side structure 120 and the underframe 110 is the same as the above configuration.

  A joining procedure will be described. The frame 110 is placed on the gantry 210, the side structures 120 and 120 are placed thereon, and the side structures 120 are fixed at predetermined positions by the support devices 230 and 240. The underframe 110 and the side structures 120, 120 are intermittently temporarily welded from the inside of the vehicle and the outside of the vehicle. Next, the inside of the vehicle is fully arc welded to the face plates 121b and 111b.

Next, the right and left joining devices 300 and 300 are caused to travel synchronously and are joined synchronously. A groove 40 is provided in the joint by the circular saw 61 of the joining device 300, the filling material 30 is disposed in this, and finally friction stir welding is performed.
The cutting which makes the groove | channel (gap) 40 with the circular saw 61 from the edge part of the longitudinal direction of a vehicle body is started. When the groove 40 having a predetermined length is formed, the traveling of the carriage 310 is stopped, and the filling material 30 is drawn out from the drum 90 and inserted into the groove 40.

  Next, the filling material 30 inserted into the groove 40 is temporarily fixed and welded to the convex portions 12 and 22. The welding position is the starting end of the filling material 30 inserted into the groove 40. Next, the roller 70 is protruded to a predetermined position on the groove 40 side, and the traveling of the carriage 310 is started. Cutting resumes. The insertion of the filling material 30 into the groove 40 is started and the roller 70 is fixed.

  When the rotary tool 80 of the friction stir welding apparatus moves to the position of the start end of the joining line, the traveling of the carriage 310 is stopped. The rotary tool 80 is inserted into a portion to be joined while rotating. Next, the traveling of the carriage 310 is resumed.

  Friction stir welding is performed by synchronizing the right and left joining devices 300 and 300. That is, the axis of the rotary tool 80 of the left joining device is substantially on the extension line of the axis of the rotary tool 80 of the right joining device 300. Between them, there are face plates 111b and 112b of the underframe 110. For this reason, the large load at the time of friction stir welding is supported by these, and the deformation of the underframe 110 can be prevented.

  However, generally, the axis of the rotary tool 80 is inclined with respect to the traveling direction. For this reason, the other rotary tool 80 often does not exist on the extension line of the axis of one rotary tool. In this case as well, the load of one rotary tool 80 cannot be supported by the other rotary tool 80, but the vicinity is supported. For this reason, deformation | transformation of a frame etc. can be prevented and friction stir welding can be performed.

  As a device for supporting the load of one rotary tool 80 on the other side, the extension line of the axis of the one rotary tool 80 is supported by a roller, and is driven in synchronization with the one rotary tool 80. When there are a plurality of rollers, they are provided along the joining line. In addition, a support device that supports the periphery of the other joint is installed and supported. A support device excluding the rotary tool 80 may be provided on the other side of the one rotary tool 80. In this case, the support device supports the joined portion or the unjoined portion.

  The car body is usually provided with a camber. If the camber 110 is provided with a camber, the cutting height position and the friction stir welding height position are moved up and down according to the camber. In this case, an end mill is preferable to a circular saw.

  In the above embodiment, the filling material is fixed by caulking the convex portions 12 and 22 in a steady state, but may be fixed at a predetermined interval by welding. The welding position is provided between the circular saw 61 and the guide 95.

  The face plate 121b of the hollow mold member 121 and the face plate 111c of the hollow mold member 111 are joined at a connection portion 111h between the connection plate 111g and the face plate 111c that connect two substantially parallel face plates (one is 111c). it can. The face plate 111c above the connecting portion 111h is recessed so that the face plate 121b overlaps. Accordingly, the lower end of the face plate 121b is abutted against the face plate 111c below the connecting portion 111h. The connection plate 111c is positioned on an extension line of the axis of the rotary tool 80. Thereby, the load of the rotary tool 80 can be supported. The end of the face plate 121c is welded to the face plate 111b.

  The embodiment of FIG. 10 will be described. A piece (corresponding to a face plate) 111j protruding upward is provided on the vehicle exterior side of the hollow shape member 111 at the end of the underframe 110. A face plate 121b on the vehicle exterior side of the hollow member 121 of the side structure is abutted against this. There is a connecting plate 121d for connecting the inner and outer face plates 121b and 121c on the back surface of the abutting portion between the piece 111j and the face plate 121b. The connection plate 121d is substantially orthogonal to the face plates 121b and 121c. For this reason, the connecting plate 121d is on an extension line of the axis of the rotary tool 80 at the time of joining. The connecting portion between the connecting piece 121d and the face plate 121b has a concave portion and a protruding piece that overlap the face plate 121b as in the above embodiment.

  After welding the face plate 121c and the face plate 111b, the support device 250 is disposed so as to be in contact with the face plate 121c. A large number of support devices 250 are installed along the longitudinal direction of the vehicle body. The support device 250 is telescopic. Next, friction stir welding is performed. The load of one rotary tool 80 is transmitted to the other rotary tool 80 side through the support device 250.

The embodiment of FIG. 11 will be described. Two protruding pieces 111j and 11j protrude above the hollow shape 111. Two protruding pieces (corresponding to face plates) 111p and 111p are connected by a connecting piece 111q. The connection piece 111q is installed in the same manner as the connection piece 121d. Similar to the above embodiment, the connecting portion between the connecting piece 111q and the protruding pieces 111p, 111p includes a concave portion and a protruding piece that overlap the face plates 121b, 121c.
After welding the face plate 121c and the protruding piece 111p, the support device 250 is disposed. The support device 250 preferably contacts both the face plate 121c and the protruding piece 111p. The connecting plate 111q is positioned on the extension line of the axis of the rotary tool 80, and friction stir welding is performed.

  In this embodiment, if the length of the protruding piece 111p is short, the support frame 250 can be dispensed with because the frame 110 is strong.

  The embodiment of FIGS. 12 to 13 will be described. This is a joining device for the roof structure 130 and the side structures 120, 120. The side structures 120, 120 are placed on the stand 210B, and the roof structure 130 is mounted on the side structures 120, 120. This is supported from inside and outside the vehicle body by support devices 230B and 240B. The support device 240B pulls or pushes the roof structure 130 and the side structure 120 from the inside of the vehicle. The support devices 230B and 240B correspond to the support devices 230 and 240 of the above embodiment. Further, the lower end of the side structure 120 is positioned by being placed in the recess of the gantry 210B.

  When the side structures 120, 120 and the roof structure 130 are fixed at predetermined positions by the support device 240B, the butted portions of the side structures 120, 120 and the roof structure 130 inside the vehicle are arc-welded. If it welds, the support apparatus 250 will be arrange | positioned between these left and right weld parts. The support device 250 supports the vicinity of the weld. The support device 250 is a support bar.

  Next, the left and right carts 310B and 310B are run as described above, the grooves are cut by the joining devices 300B and 300B, the filling material is filled, and the friction stir welding is performed. The load at the time of friction stir welding is supported by the other connection plate 123c and the rotary tool 80 via the connection plate 123c and the support device 250 at the joint.

  A configuration of a joint portion between the hollow shape member 126 at the upper end of the side structure 120 and the hollow shape member 131 at the lower end of the roof structure 130 will be described. The two face plates 126b and 126c (131b and 131c) of the hollow shape member 126 (131) have the connection plates 126d (131d) arranged in a truss shape. The end of the face plate 131b and the end of the face plate 131c are connected by an inclined connection plate 131d. There is no connection plate that connects the end of the face plate 126b and the end of the face plate 126c. For this reason, the edge part of the face plate 131c (126b) protrudes to the edge part side rather than the face plate 131b (126c). The connecting portion (intersection) between the face plate 131b and the two connecting plates 131d and 131d has a concave portion as in the above embodiment, and a protruding piece on the back surface. The connection portion (intersection) between the face plate 126c and the end connection plate 126d has a recess as in the above embodiment, and a protruding piece on the back surface. The face plate 126b of the hollow shape member 126 overlaps the concave portion and the protruding piece of the face plate 131b. The face plate 131c of the hollow shape member 131 overlaps the concave portion and the protruding piece of the face plate 126c. The butted portions of the face plates 126b and 131b on the vehicle exterior side have convex portions 12 and 22. The center of the thickness of the circular saw 61 and the extension line of the axial center of the rotary tool 80 are at the intersection of the two connection plates 131d and 131d.

  The load at the time of friction stir welding is transmitted to the face plate 126c through the two connection plates 131d and 131d. Then, it is transmitted to the other side structure 120 via the support device 250.

  The embodiment of FIG. 14 will be described. There is a support device 250B installed on the gantry 210B between the two side structures 120, 120, and the support device 250 is installed. After the inside of the vehicle is welded, it is supported by the support device 250. The support device 250 can be a roller or a rotary tool as in the above embodiment. When the support device 250 is a roller or a rotary tool, the support device 250 moves in synchronization with the rotary tool 80.

  The embodiment of FIG. 15 will be described. After the two members 10 and 20 are abutted as described above, arc welding is performed along the joining line. Continuously along the joining line. In particular, weld where there is a gap and fill the gap as much as possible. (FIGS. 15A and 15B)

  Next, friction stir welding is performed with the rotary tool 80. In this case, the raised weld bead B is regarded as the convex portions 12 and 22. That is, friction stir welding is performed by positioning the lowermost end of the large-diameter portion 81 of the rotary tool 80 in the raised weld bead B. In addition, you may weld what provided the convex parts 12 and 22 in the members 10 and 20. As shown in FIG. (FIGS. 15C and 15D)

The welding is performed as a gap filling material. Originally, the abutting portion is an I-shaped groove because the abutting portion is not a gap. For this reason, there may be no weld bead (complementary material) below the gap. However, the raised weld bead B and the convex parts 12 and 22 serve as a filling material. The strength of this welding may be such that the portion of the weld bead B that is not friction stir welded does not peel off due to the friction stir force.
The two members can be butted and cut, and then moved so that the grooves of the two members are reduced or eliminated, and the friction stir welding can be performed in this state.

  The technical scope of the present invention is not limited to the language described in each claim of the claims or the language described in the section of the means for solving the problem, and includes a range that can be easily replaced by those skilled in the art. It extends.

The process drawing of joining of one example of the present invention. II-II sectional drawing of FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. The block diagram of the joining apparatus of the other Example of this invention. The front view of the joining apparatus of the other Example of this invention. VII-VII sectional drawing of FIG. VIII-VIII sectional drawing of FIG. The longitudinal cross-sectional view of the junction part of the base frame of FIG. 6, and a side structure. FIG. 9 is a view corresponding to FIG. 9 of another embodiment of the present invention. FIG. 9 is a view corresponding to FIG. 9 of another embodiment of the present invention. The front view of the joining apparatus of the other Example of this invention. The longitudinal cross-sectional view of the junction part of the side structure of FIG. 12, and a roof structure. The front view of the joining apparatus of the other Example of this invention. The process drawing of joining of other examples of the present invention.

Explanation of symbols

  10, 20: member, 11, 21: plate, 12, 22: convex portion, 30: filling material, 40: gap, 60: cutting tool, 70: roller, 80: rotating tool, 90: drum, 110: underframe 111, 112: Hollow profile, 120: Side structure, 121, 126: Hollow profile, 130: Roof structure, 131: Hollow profile, 250: Support device, 300: Joining device, 310: Cart, 250B: Support Device, 300B: Joining device, 310B: Cart.

Claims (23)

Place the side structure on the underframe,
Welding the vehicle inside of the joint between the underframe and the side structure,
While cutting the abutting portion between the vehicle outer side of the underframe and the vehicle outer side of the side structure along the joining line,
While inserting a filling material into the gap generated by the cutting,
Friction stir welding along the joining line;
The production method of the car body characterized by. Place the roof structure on the side structure,
Welding the inside of the vehicle among the joints between the side structure and the roof structure;
While cutting the abutting portion between the vehicle outer side of the side structure and the vehicle outer side of the roof structure along the joining line,
While inserting a filling material into the gap generated by the cutting,
Friction stir welding along the joining line;
The production method of the car body characterized by. Welding to the part where the gap on the outside of the butt portion between the underframe and the side structure or the butt portion between the side structure and the roof structure is a predetermined value or more,
Including the welded portion, friction stir welding along the joining line;
The production method of the car body characterized by. Place side structures on both ends of the underframe,
The face plate of the base frame and the vehicle outer side of the other side structure substantially extend on the extension line of the axis of one rotary tool for friction stir welding the vehicle outer side of the one side structure and the vehicle outer side of the frame. A friction stir welding with the rotary tool in a state where a joint portion between the underframe and the vehicle outer side, and a support device that supports the joint portion from the vehicle outer side are sequentially positioned,
The production method of the car body characterized by. The method of manufacturing a vehicle body according to claim 4,
The support device is a rotary tool for friction stir welding the vehicle outer side of the other side structure and the vehicle outer side of the underframe,
Each of the rotating tools moves synchronously along the joining line;
The production method of the car body characterized by.   5. The method of manufacturing a vehicle body according to claim 4, wherein the support device moves along a joining line in synchronization with the rotary tool. The method of manufacturing a vehicle body according to claim 4,
The joint portion between the underframe and the side structure is made of a hollow material,
Welding the inside of each of the joints between the underframe and each side structure,
Performing the friction stir welding,
The production method of the car body characterized by. Place the side structure on the hollow shape at one end of the underframe,
A connecting plate that connects the two face plates of the hollow profile is positioned substantially on an extension line of the axial center of the rotary tool for friction stir welding the vehicle exterior of the side structure and the vehicle exterior of the hollow profile. In a state where friction stir welding is performed by the rotary tool,
The production method of the car body characterized by. Place side structures on the hollow profile at both ends of the underframe,
The two face plates of the one hollow profile are substantially formed on an extension line of the axial center of one rotary tool for friction stir welding of the vehicle exterior of the one side structure and the vehicle exterior of the one hollow profile. A connecting plate for connecting, a connecting plate for connecting two face plates of the other hollow profile member, a joint portion between the vehicle exterior side of the other side structure and the vehicle exterior side of the hollow profile member, and supporting the joint portion from the vehicle exterior side In a state where the supporting devices to be sequentially positioned, friction stir welding is performed by the rotary tool,
The production method of the car body characterized by. The vehicle body manufacturing method according to claim 9,
The support device is a rotary tool for friction stir welding the vehicle outer side of the other side structure and the vehicle outer side of the underframe,
Each of the rotating tools moves synchronously along the joining line;
The production method of the car body characterized by.   The vehicle body manufacturing method according to claim 9, wherein the support device moves along a joining line in synchronization with the rotary tool. The vehicle body manufacturing method according to claim 9,
The joint portion between the underframe and the side structure is made of a hollow material,
Welding the inside of each of the joints between the underframe and each side structure,
Performing the friction stir welding,
The production method of the car body characterized by. Place side structures on both ends of the underframe,
On the extension line of the axial center of the rotary tool for performing friction stir welding, a joint part on the vehicle outer side of the one side structure and the frame, the vehicle inner side, the first support device, the other of the above Friction by the rotary tool in the state where the vehicle inner side of the joint between the vehicle outer side of the side structure and the underframe, the vehicle outer joint, and the second support device for supporting the joint from the vehicle outer side are sequentially positioned. Stir welding,
Both ends of the first support device are in contact with the inner sides of the respective joints;
The production method of the car body characterized by. The method of manufacturing a vehicle body according to claim 13,
The second support device is a rotary tool for friction stir welding the vehicle outer side of the other side structure and the vehicle outer side of the underframe,
Each of the rotating tools moves synchronously along the joining line;
The production method of the car body characterized by.   14. The vehicle body manufacturing method according to claim 13, wherein the second support device moves along a joining line in synchronization with the rotary tool. The method of manufacturing a vehicle body according to claim 13,
The joint portion between the underframe and the side structure is made of a hollow material,
Welding the inside of each of the joints between the underframe and each side structure,
Arranging the first support device;
Performing the friction stir welding,
The production method of the car body characterized by. Place the roof structure on the two side structures,
On the extension line of the axial center of the rotary tool for performing friction stir welding, a joint part on the vehicle outer side of the one side structure and the roof structure, the vehicle inner side, the first support device, the other of the above Friction by the rotary tool in the state where the vehicle inner side of the joint portion between the vehicle exterior of the side structure and the roof structure, the joint portion of the vehicle exterior, and the second support device that supports the joint from the vehicle exterior are sequentially positioned. Stir welding,
Both ends of the first support device are in contact with the inner sides of the respective joints;
The production method of the car body characterized by. The vehicle body manufacturing method according to claim 17,
The second support device is a rotary tool for friction stir welding the vehicle outer side of the other side structure and the vehicle outer side of the roof structure,
Each of the rotating tools moves synchronously along the joining line;
The production method of the car body characterized by.   18. The vehicle body manufacturing method according to claim 17, wherein the second support device moves along a joining line in synchronization with the rotary tool. The vehicle body manufacturing method according to claim 17,
The joint portions of the roof structure and the side structure are each made of a hollow material,
Welding the inside of the vehicle among the joints between the roof structure and the side structures,
Arranging the first support device;
Performing the friction stir welding,
The production method of the car body characterized by. Place the roof structure on the two side structures,
On the extension line of the shaft center of the rotary tool for performing friction stir welding, the joint portion on the vehicle outer side of one of the side structures and the roof structure, and the support device for supporting the vehicle inner side are sequentially positioned. In state,
Moving the rotary tool and the support device along a joining line synchronously, and performing friction stir welding by the rotary tool;
The production method of the car body characterized by. The vehicle body manufacturing method according to claim 21,
The joint portions of the roof structure and the side structure are each made of a hollow material,
Welding the inside of the vehicle among the joints between the roof structure and the side structure;
Performing the friction stir welding,
The production method of the car body characterized by. The both ends in the width direction of the underframe made of the first hollow shape member and the side structure made of the second hollow shape member are joined at two locations,
The vehicle outer side of the first hollow shape member and the vehicle outer side of the second hollow shape member are friction stir welded,
The two frictional joints are on an extension line of a face plate inside the vehicle of the first hollow profile;
A car body characterized by

Images