JP2001287666A - Car body for automobile and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a car body for an automobile with a high strength and an assembling method thereof forming a mono-cock structure having a close cross section by a difficultly welding cab side/inner side frame member made of aluminum base alloy or magnesium base alloy and an outer side frame member. SOLUTION: A cab side/inner side frame member and an outer side frame member integrally surrounding around a side door opening including a hinge pillar part made of aluminum base alloy or magnesium base alloy are joined by a friction stirring welding method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle body employing a novel lightweight metal monocoque structure and a method of assembling the same.

[0002]

2. Description of the Related Art Hitherto, a monocoque structure in which an exterior member and a vehicle body frame are integrally formed has been adopted for a vehicle body. These are assembled by joining each exterior member formed by press molding by welding etc.,
The cross-sectional shape of each molded exterior member is formed in a closed cross-sectional shape that also functions as a reinforcing rib. Also, from the point of weight reduction, the cab side and inner side integrated aluminum alloy or magnesium alloy cast member that integrally incorporates the periphery of the side door opening including the hinge pillar portion and the outer side expansion member are closed. A vehicle body structure of an automobile having a monocoque structure that forms a monocoque structure having a cross section has been proposed in Japanese Patent Application Laid-Open No. 6-286651.

However, when the cabside / inner-side integral member is an aluminum alloy or a magnesium alloy, ordinary fusion welding is essentially unsuitable, and when the inner member and the outer member are joined, (1) a cast member A method of caulking, in which a part of the projection is projected from the spreading member as a projection and crushed and fixed by an external force, (2) a method of fixing the projection with a fastener such as a snap ring,
(3) A method is adopted in which a screw is passed through the spreading member side so as to penetrate the screw, and a screw tip is screwed into a casting to be fixed. Further, in these joining methods, it is necessary to devise a separate method so that the appearance of the vehicle body is not impaired. Further, these methods have a problem that the strength of the joining portion is likely to be reduced or crevice corrosion is likely to occur.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an automobile body and a method of assembling the same using an aluminum-based alloy or a magnesium-based alloy, which has a good appearance, has a high joint strength and does not cause crevice corrosion. Is to do.

[0005]

SUMMARY OF THE INVENTION The present invention provides a cabside inner frame member and a cabside. An automobile body or a method of assembling an automobile body in which an outer frame member is integrally joined to a closed cross-sectional shape by joining, wherein the joining is performed by a friction stir welding method.

The present invention relates to a cabside inner frame member and a cabside. An automobile body or an assembling method thereof in which an outer frame member and a closed cross-sectional shape are integrally joined by rotating a joining tool made of a material substantially harder than the frame member at a joint of the frame member. While joining by the friction stir welding method of moving the joining surface, a dummy member integrated with the framework member is provided at the joining start position and the end position, the joining is started from the dummy member at the start end, and the framework member is joined. After joining, the terminal dummy member is joined and then processed into a predetermined shape by press working. After the dummy member is removed at the same time, the cabside / inner side frame member and the cabside. The outer frame member is joined by the friction stir welding method.

The cabside inner frame member or the cabside outer frame member is a cast member made of an aluminum-based alloy or a magnesium-based alloy;
Preferably, it is an injection-molded member or a spread member.
Further, in the friction stir welding method, it is preferable to perform the following method.

[0008] The cabside / inner frame member is formed on a flat plate, and the load direction of the bonding is set so as to receive a load from a bonding tool in a width direction of the flat plate.
An end portion of the cabside / inner frame member is placed on a step provided on an end side surface of the cabside / outer frame member, and the cabside / inner frame member and the cabside / outer frame member are placed on the stepped portion. Inserting and joining a joining tool from both end surface sides, further placing the end of the cabside / inner frame member on the end surface of the cabside / outer frame member, and joining the cabside / inner frame member Inserting and joining a joining tool from the member side, further placing an end of the cabside / outer side frame member on an end surface of the cabside / inner side frame member, and More preferably, a joining tool is inserted into the end and joined.

Further, the friction stir welding method in the present invention refers to
This is a welding method capable of continuously welding in a welding tangential direction by inserting a rotating tool made of a material substantially harder than a workpiece into a welding portion of the workpiece and moving the tool while rotating the tool. In other words, this is a welding method in which friction stir welding is performed using the plastic flow of metal due to frictional heat generated between the welding tool and the workpiece. This welding method is a solid-phase welding that can be performed without melting in the case of fusion welding such as arc welding.Because the welding temperature is low, it is suitable for joining methods such as alloys containing magnesium and the like that are easy to volatilize in the molten state Therefore, there are many advantages such as less welding defects and less deformation after joining.

[0010] The cabside / inner side integrally incorporated around the side door opening including the hinge pillar portion made of an aluminum alloy or magnesium alloy cast member, injection molded member, or wrought member by the friction stir welding method. The member and the outer-side integral member can be joined. However, the cabside / inner-side integral member and the outer-side integral member are friction-stir-welded while being restrained from both sides by a suitable restraining jig. Also, depending on the material, due to the downward load of the rotating tool,
When there is a possibility that the joint may be deformed or buckled, a support jig for supporting the welded portion is required.

According to the present invention, a defect generated at the beginning and end of joining is removed, and at the same time, plastic working is performed simultaneously into a predetermined shape to thereby obtain a friction stir welding method with less irregularities such as joining burrs on the surface. It is something that can be done.

Further, the joining tool comprises a small-diameter pin and a large-diameter shoulder, and the length of the starting end dummy member in the joining direction and the length of the terminal dummy member in the joining direction are determined by the radius of the shoulder and the pin. It is desirable that the length be longer than the total length of the pins, more preferably three times or more, and 3.5 to 6 times the diameter of the pin.

In the above-mentioned method, the joining is started from a distance corresponding to the diameter of the pin of the dummy member at the start end, and the materials to be joined are joined together, and the dummy member at the end is adjusted to the diameter of the pin. It is preferable that the dummy member is removed by press working after joining with a corresponding distance, and the work to be joined is pressed into a predetermined shape, preferably a three-dimensional shape.

According to the present invention, there is provided a cabside / inner side frame member formed by joining a plurality of flat parts into an integral frame structure by a friction stir welding method.
A method for assembling an automobile body in which an outer frame member is integrally joined to a closed cross-sectional shape by a friction stir welding method, wherein the flat plate part includes upper and lower members, left and right members, and the upper and lower members at a central portion. It has a frame structure having a central member to be connected, a dummy member is provided at the beginning and end of the joint of each member, and the left and right members and the central member are respectively attached to the upper member and the lower member at the starting end. The joining is started from a dummy member, the joining is performed, and the dummy member at the end is joined.

The present invention relates to a cabside / inner frame member and a cabside / inner frame member formed by joining a plurality of flat parts into an integral frame structure by a friction stir welding method.
An automobile body in which an outer frame member is integrally joined to a closed cross-sectional shape by a friction stir welding method, wherein the flat plate component connects upper and lower members, left and right members, and the upper and lower members at a central portion. A frame structure having a central member, a dummy member provided at a start end and a terminal end of a joint portion of each of the members, and the right and left members and a central member are respectively provided at the upper member and the lower member as the dummy members at the start end. After the joining is started, the joining is performed, and the dummy member at the end is joined, and then processed into a predetermined shape by press working, and the dummy member is removed at the same time.

In the friction welding apparatus according to the present invention, a tool made of a harder material is inserted into a joining portion when joining to a flat plate placed and fixed on a gantry, and joining is performed by plastic flow of the joining material. The tool has a screw portion to be inserted into the joint portion, and a shoulder portion that supports the screw portion and has a larger diameter than the screw portion, and the screw portion is formed so that the screw portion does not contact the surface of the gantry. It is preferable that the length of the tool is set to a desired length and that the shoulder has a pressing amount adjusting means for adjusting the pressing amount of the tool so that a concave portion having a desired depth is formed on the surface of the bonding material. The distance between the tip of the tool and the gantry is 0.4 mm or less, preferably 0.05 to 0.2 mm.
0 mm. Therefore, the length of the screw portion is selected according to the thickness of the joint of the materials to be joined. The depth of the pushing amount is 1
mm, preferably 0.2 to 0.6 mm.

The joining tool has an angle adjusting means for adjusting an inclination angle so that a leading portion of the shoulder portion has a desired gap on a surface of a material to be joined with respect to a traveling direction of the joining. The pushing amount is adjusted by a trailing portion of the portion. The inclination angle can be tilted in both directions within 10 degrees, preferably 3 to 7 degrees with respect to the vertical angle to the surface of the material to be joined. Is preferably provided. The groove is preferably formed in a bag shape so that the head of the bolt is engaged. It is preferable that a pressing means is provided for pressing the material to be joined from the side surface thereof so as not to open the joint portion of the material to be joined.

The apparatus according to the present invention comprises means for moving the tool in the number of rotations, rotation direction, inclination angle, vertical movement, movement in the direction of the welding line, a control device therefor, and means for restraining the material to be welded. Automatically driven devices are preferred. In addition, the base for restraining the workpiece is provided with a bag-shaped groove in the base as described above, the head of a bolt is engaged in the groove, a long arm is attached to the bolt, and the workpiece is held by the arm. It is preferable to fix it firmly with screws.

Further, it is preferable to provide a monitoring device capable of optically or electronically monitoring the bonding state in the bonding process. The center position of the tool is adjusted by monitoring.

The apparatus according to the method of the present invention preferably further has the following configuration.

(1) The direction of rotation of the tool in the forward and backward paths of joining can be controlled by inverter control. The tilt angle allows drive from the electric motor via the index shaft.

(2) The insertion depth of the tool from the surface of the joining material can be adjusted by adjusting the depth of the tool according to the unevenness of the material to be joined or the shape of the joining depth. The insertion depth of the tool can be made by changing the length of the pin from the shoulder. The adjustment of the length of the pin is performed by a fixed structure in which the shoulder and the pin move up and down with each other and rotate in the same manner.

(3) In the case of the joining shape in which a part of the surface of the material to be joined is inclined, the tool inclination mechanism automatically adjusts the driving mechanism of the tool in accordance with the inclination angle of the joining material. This is possible.

(4) When a plurality of welding lines are present in the material to be welded, a plurality of tools are attached to one friction welding device, and the plurality of tools are rotated at a rotation speed, a moving speed,
The joining operation can be more efficiently achieved by operating the inclination angles independently or in conjunction with each other.

(5) The material to be joined can be restrained by a restraining mechanism provided coaxially with the tool. Further, it is possible to provide a restraint mechanism independently of the restraint mechanism.

In order to adjust the insertion depth of the tool from the surface of the workpiece, the position of the unevenness on the surface of the workpiece and the change in the unevenness from the welding start point are measured in advance, and the measurement result is recognized by the control device. It is possible by controlling the vertical drive mechanism of the tool based on the recognition signal. That is, the time required for the tool to reach the position of the unevenness from the position of the unevenness from the welding start point and the welding speed can be determined, and the time for driving the tool up and down can be determined. In addition, changes in the height of the unevenness,
This is possible by measuring with a laser displacement type or dial gauge and making the control device recognize the result.
According to the above-described method, the depth of the tool can be constantly controlled from the uneven surface even in the joint shape where unevenness exists in a part of the workpiece. In particular, when the unevenness is large, it is possible to pull out the tool once from the material to be joined, stop the joining once, and then reinsert the tool according to the surface of the unevenness.

In the case of a joining shape in which a part of the surface of the material to be joined is inclined, the inclination angle of the tool and the starting point of the inclination are as follows:
In advance, measure the inclination of the material to be joined and the inclination angle of the starting point,
This can be achieved by causing the control device to recognize the result and controlling the drive mechanism of the tool based on the recognition signal. The positions of the start and end points of the inclination can be automatically determined based on the time signal from the distance from the joining start point and the calculation. In addition, the inclination angle, the starting point and the ending point of the inclination are measured by the laser displacement meter in the joining process, and the inclination angle of the tool can be adjusted in the joining process based on the signals.

[0028] In the joining process, forward and backward joining can be performed. In this case, a plurality of tools, preferably 3 to 5 tools are attached to one friction welding apparatus. The joining operation can be performed more efficiently by operating the rotation speed, the moving speed, and the inclination angle independently or in conjunction with each other. In addition, the automatic adjustment of the tool angle is possible through the worm gear with the driving force from the electric motor.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) 1 is a development view of a cabside frame composed of four doors. As shown in the figure, the cab side frame includes a hinge pillar portion and integrally takes in the periphery of the side door opening. The cab side / inner side frame member 1 and the outer side are all made of a magnesium-based alloy or an aluminum-based alloy. It is constituted by the frame member 2. As an aluminum-based alloy, 5000 series containing magnesium, which is a wrought or cast alloy that has been used as a material for outer panels for automobile bodies,
6000 series, 7000 series, die casting alloys such as ADC12 aluminum alloy, magnesium alloy, ASTM standard AZ system, die-casting alloy, AM series, JIS standard wrought alloy JIS MP1 ( 3% al-1% Zn-Mg), MP7 (2% Al-1
% Zn-Mg) and ASTM standard ZE10A alloy. The cabside / inner side frame member 1 and the cabside outer side frame member 2 are joined in a closed cross-sectional shape having a space inside by the friction stir welding method of the present invention described below.

It was manufactured by injection molding as shown in FIG.
Cab side / inner side frame member 1 that incorporates around the side door opening including the hinge pillar made of AM type magnesium alloy, and inner side frame member made of 6000 series aluminum alloy (Al-Mg-Si) manufactured by pressing. 2 are joined by superposition of various structures and fixing by a joining member restraining jig suitable for the structure.

FIG. 2 is a cross-sectional view showing various superposed structures and their joining methods. In FIG. 2A, one of the joining portions of the cabside / inner-side frame member 1 is L-shaped, and the end surface of the outer-side frame member 2 is applied to one end surface, and the other is applied to the side surface. Is joined by the joining tool 3 as described above. In any case, the joining tool 3 is inserted so as not to penetrate the member, and a reverse fold is formed. Although there is a gap between the joints in the figure, the joints are closely attached and fixed by an appropriate restraining jig. Further, the cabside / inner side frame member 1 may have an opposite structure.

FIG. 2 (2) shows the cabside / inner frame member 1 having a flat plate shape, a step provided at the joint portion of the cabside outer frame member 2, and insertion into that portion to apply the load by the joining tool 3. It is intended to be supported.
With such a structure, the joining can be performed in the same manner as described above with a simple structure using an external pressing as a restraining jig. The restraining jig is the cabside outer frame member 2
The same frame structure as that having the lower cross-sectional structure is preferable.

FIG. 2 (3) shows a structure in which a projection (projection) is formed at the joint of the cabside / inner frame member 1, a recess (hole) is formed in the cabside outer frame member 2, and a hole is formed in the other. The reverse structure is mentioned. The joining is the same as described above.

FIG. 2 (4) shows the cabside / inner frame member 1 supporting the load applied by the joining tool 3.

After the joints are butted and fixed by the above method, the rotating tool 3 made of a material harder than the magnesium alloy or the aluminum alloy is inserted into the butted portions of the joining members while being rotated, and moved in the joining progress direction. Thus, the friction stir welding can be continuously performed using the plastic flow of the metal due to frictional heat generated between the tool and the two members. The rotary tool 3 includes a shoulder 4 having a diameter of 10 mm and a pin 5 having a diameter of 3 mm smaller than the shoulder and having a length of 3 mm.

The thickness of both members at the joint is 2 m
m, the width is 10mm, and the joining condition is tool inclination angle: 3
°, tool insertion depth: 0.2 to 1.0 mm, tool rotation speed: 1000
rpm, joining speed: 500 mm / min. Depending on the material, if there is a possibility that the joint will be deformed or buckled due to the downward load of the rotating tool, an appropriate support jig for supporting the joint is required.

According to this joining method, it is possible to join both members made of a magnesium alloy or an aluminum alloy, which are difficult to weld by the conventional fusion welding method, with few welding defects and little deformation after joining. Further, the aforementioned (1)
A method by caulking, (2) A method of fixing the above-mentioned projection with a fastener such as a snap ring, (3) A method of passing a screw through the spreading member side so as to penetrate it, and screwing a screw tip into a casting to fix the same. (1) It is necessary to devise separately so that the appearance of the vehicle body is not impaired.
(2) The problem that the strength of the joint is reduced and (3) crevice corrosion or the like easily occurs is solved.

FIG. 3 is a cross-sectional view showing an insertion state at the time of joining when joining the joining tool 10 to a material to be joined while rotating the joining tool 10 according to the present embodiment. In this embodiment, in the joining tool 10, the shoulder 46 of the joining tool 10 rises to the right with respect to the joining direction 47, and a gap a is provided in the leading portion of the shoulder 46 with respect to the surface of the workpiece 38. The material to be joined is prevented from being cut at the shoulder portion, and is pushed into the material to be joined at intervals of b in the following portion. In order to prevent a reduction in strength due to a recess formed by the shoulder portion 46, the projection 5
5 is preferably provided at the joint.

The distance between a and b is less than 1 mm, preferably 0.2 to 0.6 mm. Further, when the thickness of the material to be welded is large, the thread portion and the shoulder diameter of the tool become large, so that the interval becomes large, and the allowable range has a proportional relationship.

With respect to the surface of the workpiece 38 of the tool 1, θ
The angle is preferably within 10 degrees, more preferably 3 to 7 degrees. It is preferable that the angle be increased depending on the thickness of the material 38 to be joined. Further, the distance c between the joining tool 10 and the gantry 73 is necessary to prevent direct contact between the joining tool 10 and the gantry 73 and prevent damage to both. However, if the distance c is too large, the bonding on the back surface of the material 38 to be bonded becomes insufficient. Therefore, in order to obtain sufficient bonding, the distance is set to 0.4 mm or less, preferably 0.05 to 0.2 mm. Things. The joining tool 10 has a screw portion 45 and a shoulder portion 46 to be inserted into the material 38 to be joined, and the tip of the screw portion 45 is rounded and R-shaped. Further, in addition to the present embodiment, the diameter of the screw portion can be reduced at a portion close to the shoulder portion so that bonding with a smaller bonding width can be performed. The small diameter portion is preferably set to 0.7 to 0.9 times the maximum diameter.

(Embodiment 2) In this embodiment, the above-mentioned cabside / inner side frame member 1 and cabside outer side frame member 2 are formed by a friction stir welding method. The tab is provided, joining is started at a distance corresponding to the diameter of the threaded portion of the joining tool 10 from the tip of the tab, and the joining is ended at the end of the tab at the same distance as described above. afterwards,
The tab is removed by press working and the plastic working is performed simultaneously to the above-described three-dimensional shape, and the two are integrated by friction stir welding as in the first embodiment.

FIG. 4 is a front view of a frame structure of a side panel 25 of an automobile body before joining, FIG. 5 is a front view after joining, and FIG. 6 is a front view after pressing. As shown in FIG. 4, the structure is such that five parts of an upper member 20, a left member 21, a center member 22, a right member 23, and a lower member 24 are joined as flat pressed parts. As shown in the drawing, a dummy member is provided at the joint of each member, and the above-mentioned friction stir welding is performed at two places. Here, an example is shown in which the joining direction proceeds from the left side to the right side in order to simplify the joining operation. Both started and ended in the middle of the tab. After the joining, the structure shown in FIG. 5 is obtained. By pressing the side panels integrated by the joining at one time, the starting end and the ending portion of the joining can be removed and the predetermined structure can be obtained. Although this vehicle body structure is slightly different from the structure of FIG. 1, it is clear that it can be formed in the same manner.

In FIG. 6, in order to prevent the stress from concentrating at the joint and breaking at the joint, the joint is slightly shifted from the corner where the stress is concentrated. FIG. 6 shows a planographic shape, but in three-dimensional plastic working, the back side of the bead is made to be the front side of the product.

The bonding according to the present embodiment can be performed in the same manner as the method described with reference to FIG. That is, in the joining of the flat plates, the distance c between the joining tool 10 and the gantry 73 is set.
Is necessary to prevent direct contact of the joining tool 10 with the gantry 73 and prevent damage to both. However, if the distance c is too large, the bonding on the back surface of the material to be bonded 38 becomes insufficient. And preferably 0.05 to 0.2 mm. Thereby, good bonding can be obtained. In addition, it is preferable that a projection 55 is provided on the joining portion of the joining material 38 in order to eliminate a decrease in strength due to a recess formed by the shoulder portion 46.

The joining tool 10 has a screw portion 45 and a shoulder portion 46 inserted into the material 38 to be joined.
The tip of 5 has a rounded R. Further, in addition to the present embodiment, the diameter of the screw portion can be reduced at a portion close to the shoulder portion so that bonding with a smaller bonding width can be performed. The small diameter portion is preferably set to 0.7 to 0.9 times the maximum diameter.

After the joining, the cabside / inner side frame member 1 and the cabside outer side frame member 2 are obtained by plastic working by press. After that, they are integrally joined as in the first embodiment. According to this manufacturing method, useless materials can be reduced.

[0047]

According to the present invention, the cabside / inner side frame member and the outer side frame member that integrally incorporate the periphery of the side door opening including the aluminum-based alloy or magnesium-based alloy hinge pillar are frictionally rubbed. By the stir welding method, a monocoque structure having a closed cross section can be formed with high strength with few materials without defects. As a result, (1) the appearance of the vehicle body is not impaired, (2) the strength reduction at the joint is small,
(3) A remarkable effect is obtained in that the occurrence of crevice corrosion and the like is small and (4) the deformation after joining is small.

[0048]

[Brief description of the drawings]

FIG. 1 is a perspective view of a cabside inner frame member and a cabside outer frame member.

FIG. 2 is a perspective view showing a friction stir welding method of both members in FIG.

FIG. 3 is a cross-sectional view showing a relationship between a tool and a workpiece in friction welding according to the present invention.

FIG. 4 is a front view before joining in a second embodiment.

FIG. 5 is a front view after bonding in the second embodiment.

FIG. 6 is a front view after pressing in Example 2.

[Explanation of symbols]

1 ... cabside / inner frame member, 2 ... cabside / outer frame member, 3 ... rotating tool, 4
46 ... shoulder part, 5, 49 ... screw part, 6 ... projection part, 7 ...
Holes, 15: Butting surfaces, 16: Beads, 20: Pressed parts, 21: Pressed parts, 22: Pressed parts, 23: Pressed parts, 24: Pressed parts, 25: Side panels, 3
8 ... material to be joined, 45 ... screw part, 46 ... shoulder part, 4
7 ... joining direction, 48 ... rotation direction, 49 ... tip, 55 ...
Projection, 73 ... Base.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kinya Aota 7-1-1, Omikacho, Hitachi City, Ibaraki Prefecture Inside Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Kiyomi Nakamura 7-1 Omikacho, Hitachi City, Ibaraki Prefecture No. 1 Inside Hitachi, Ltd.Hitachi Research Laboratories (72) Inventor Teruyoshi Abe 7-1-1 Omikacho, Hitachi City, Ibaraki Prefecture Inside Hitachi, Ltd.Hitachi Research Laboratory Co., Ltd. (72) Inventor Yasuhisa Aono Hitachi, Ibaraki Prefecture 7-1-1, Omikacho F term in Hitachi Research Laboratory, Hitachi, Ltd. (Reference) 3D003 AA00 AA01 AA03 AA12 BB01 CA17 CA33 CA34 CA35 CA36 CA54 CA55 3D114 AA01 AA04 AA17 BA03 EA02 EA13 4E067 AA05 BG00 EA07

Claims (11)

[Claims] A cabside / inner frame member and a cabside. What is claimed is: 1. An automobile body in which an outer frame member is integrated with a closed cross-sectional shape by joining, the joining being performed by a friction stir welding method. 2. A cabside / inner frame member and a cabside. An automobile body in which an outer-side frame member and a closed cross-sectional shape are integrally joined to each other, wherein a joining tool made of a material substantially harder than the frame member is moved while rotating a joining tool at a joint portion of the frame member. Along with joining by the friction stir welding method, a dummy member integrated with the framework member is provided at the joining start position and the end position, and the joining is started from the dummy member at the start end,
Joining the framework members, and working into a predetermined shape by pressing after joining the terminal dummy member,
After removing the dummy member at the same time, the cabside inner frame member and the cabside. An automobile body, wherein an outer frame member is joined by the friction stir welding method. 3. The cabside / inner frame member and the cabside. A method for assembling an automobile body in which an outer frame member is integrated with a closed cross-sectional shape by joining, wherein the joining is performed by a friction stir welding method. 4. A cabside inner frame member and a cabside. In a method of assembling an automobile body in which an outer frame member and a closed frame are joined together by joining, a joining tool made of a material substantially harder than the frame member is rotated at a joint of the frame member to form a joint surface. Joining by moving friction stir welding method,
A dummy member integrated with the framework member is provided at the joining start position and the end position, the joining is started from the dummy member at the start end, the framework member is joined, and the dummy member at the end is joined, followed by press working. And after removing the dummy member at the same time, the cabside inner frame member and the cabside. A method for assembling a vehicle body, comprising joining an outer frame member by the friction stir welding method. 5. A cast member in which the cabside inner frame member or the cabside outer frame member is made of an aluminum-based alloy or a magnesium-based alloy.
The vehicle body assembling method according to claim 3, wherein the method is an injection molded member or an extended member. 6. A method according to claim 3, wherein said cabside / inner side frame member is formed on a flat plate, and a load direction of said bonding is set so as to receive a load from a bonding tool in a width direction of said flat plate. The vehicle body assembling method according to any one of the above. 7. An end portion of the cabside / inner frame member is placed on a step provided on an end side surface of an end portion of the cabside / outer frame member. The vehicle body assembling method according to any one of claims 3 to 5, wherein the joining tool is inserted and joined. 8. An end portion of the cabside / inner side frame member is placed on an end surface of the cabside / outer side frame member, and a joining tool is inserted into the end portion from the cabside / inner side frame member side. The vehicle body assembling method according to any one of claims 3 to 5, wherein the vehicle body is assembled by joining. 9. An end portion of the cabside / outer side frame member is placed on an end surface of the cabside / inner side frame member, and a joining tool is inserted into the end portion from the cabside / outer side frame member side. The vehicle body assembling method according to any one of claims 3 to 5, wherein the vehicle body is assembled by joining. 10. A cabside / inner side frame member and a cabside / outer side frame member formed by joining a plurality of flat plate parts into an integral frame structure by a friction stir welding method. A method of assembling an automobile body integrally joined by a method, wherein the flat plate component has a frame structure having an upper and lower member, a left and right member, and a central member that connects the upper member and the lower member at a central portion, A dummy member is provided at the start end and the end of the joining portion of each member, and the left and right members and the center member are joined to the upper member and the lower member by starting the joining from the dummy member at the start end, respectively, A method of assembling an automobile body, comprising joining the terminal dummy member. 11. A cabside / inner-side frame member and a cabside / outer-side frame member formed by joining a plurality of flat plate parts into an integral frame structure by a friction stir welding method. A vehicle body integrally joined by a method, wherein the flat plate component has a frame structure having upper and lower members, left and right members, and a central member that connects the upper member and the lower member at a central portion. A dummy member is provided at a start end and an end of a joining portion of the members, and the left and right members and the center member are joined to the upper member and the lower member by starting the joining from the dummy member at the start end, and joining the ends. After joining the dummy members of the above, while working into a predetermined shape by pressing,
An automobile body, wherein the dummy member is removed at the same time.