JP2001162383A - Friction-stir-welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction-stir-welding method by which two welding members arranged in a butt shape can be held in a butt state and with good workability and as a result welding efficiency can be improved. SOLUTION: Parts X to be engaged each of which is composed of projecting part 12, are formed as one body in an intermediate part in the width direction on the rear sides of two welding members 10A, 10B. As a receiving jig 30, the one equipped with engaging parts Y composed of recessed parts 32 to which the projecting parts are fit, is used. Tip parts in the width direction of the respective welding members are butted. On the rear side of this butt part T, the receiving jig 30 is mounted and the rear side of the butt part T is received by the receiving jig 30. Further by making the engaging parts Y of the receiving jig fit to and engage with the parts X, both welding members 10A, 10B are held in the butt state. In this state, the butt part T is welded by the friction-stir- welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction stir welding method used for joining butted portions of two joining members arranged in a butt shape.

[0002]

2. Description of the Related Art Friction stir welding, in which two joining members are joined and integrated, is a kind of solid-phase joining, and therefore has the advantage that deformation and cracking due to thermal strain hardly occur. It has been used as a new joining method instead of.

[0003] Fig. 11 shows a case in which the butting portions (T ') of two plate-like joining members (100A) and (100B) arranged in a butt shape are joined by friction stir welding. Each joining member (100A) (100B) shown in the figure extends in the length direction, and in the figure, the widthwise end of the right joining member (100A) and the left joining member (100A) 100B) and the end in the width direction is arranged so as to face each other.

[0004] In the figure, reference numeral (170) denotes a welding tool for friction stir welding. The joining tool (170) includes a large-diameter cylindrical rotor (171) and an end face (171a) of the rotor (171).
A small-diameter pin-shaped probe (17
2), and is disposed on the surface side of both the joining members (100A) and (100B). When joining the butt portion (T ') using the joining tool (170), the probe (172) of the joining tool (170) is used.
Is inserted into the joint (T ') while rotating. And
The probe (172) is moved relative to the joining member along the butting portion (T ') in the inserted state.

[0005] The frictional heat generated by the rotation of the probe (172) softens the two joining members (100A) and (100B) at and near the contact portion with the probe (172), and the softened portion forms the probe (172). After being stirred by receiving the rotational force, the softening / stirring part undergoes plastic flow to fill the passage groove of the probe by receiving the advancing pressure of the probe (172), and then rapidly loses frictional heat and is cooled and solidified. . This phenomenon is sequentially repeated with the movement of the probe (172), and finally the butted portion (T ') is joined to integrate the two joining members (100A) (100B).

At the time of this friction stir welding, in order to prevent a problem that the softened portion softened by frictional heat bulges to the back side of the butt portion (T ') due to the insertion pressure and the advance pressure of the probe (172). Meanwhile, on the back surface of the butting portion (T '), as shown in the figure, a band-shaped receiving jig (130) straddles the butting portion (T') and is joined to the butting portion (T '). It is mounted along. The receiving jig (130) includes a receiving portion (131) having a flat surface. And this receiving jig (13
0) is attached to the back surface of the butting portion (T '), and the receiving portion (131) is connected to the probe (17) of the joining tool (170).
It is in contact with the back surface of the butted portion (T ′) in a substantially surface-contact state in a mode opposed to 2).

Further, the probe (17) of the welding tool (170)
In order to prevent the butting part (T ') from opening due to the insertion pressure and the advance pressure of 2), both joining members (100A)
(100B) is provided with a holding jig (150) for holding the two joining members in a butted state. This holding jig (150) connects the pair of left and right locking pieces (151) and (151) with both locking pieces (151) and (151), and has a male screw (152a) formed at both ends. The rod (152) and each locking piece (15
A pair of lock nuts (153) (153) for fixing the position of 1)
And Then, the holding jig (150) sandwiches the two joining members (100A) (100B) arranged in a butted manner from the left and right with the locking pieces (151) (151), thereby forming the two joining members (100A). 100A) and (100B) are held in a butt condition.

[0008]

In order to hold the two joining members (100A) and (100B) in the butted state using the holding jig (150), the holding jig (150) is used. ,
The dimension between the left and right locking pieces (151) and (151) is
0A) and (100B) widths (H1 ') and (H2') must be added together. For this reason, when the width dimension (H1 ') (H2') of each joining member (100A) (100B) is large, for example, the width dimension (H) of each joining member (100A) (100B)
If both 1 ′) and (H2 ′) are 400 mm, the holding jig (150) must have a dimension between the left and right locking pieces (151) and (151) of at least 800 mm.

As described above, according to the conventional method, it is necessary to use a large holding jig (151) when holding the wide joining members (100A) and (100B) in abutting state. The assembly work and mounting work of 151) were troublesome, and the joining work efficiency was poor.

Further, as shown in FIGS. 12A and 12B, three or more joining members (100A), (100B), and (100C) are joined and integrated to finally produce a wide butt joint. In this case, as the holding jig (150), the length between the left and right locking pieces (151) and (151) has a length corresponding to the width dimension of each butt-joined product obtained during the manufacturing stage. Must be used, holding jigs (150) (150 ') of various sizes must be prepared. As a result, the manufacturing cost of butt-joined products increases, and the holding jigs There was also a disadvantage that the assembly work and mounting work of (150) became complicated.

The present invention has been made in view of the technical background as described above, and has as its object the purpose of the present invention.
An object of the present invention is to provide a friction stir welding method that can hold joining members in a butt state with good workability, thereby improving joining work efficiency.

[0012]

In order to achieve the above object, the present invention provides a butt portion formed by abutting a widthwise end of a first joining member and a widthwise end of a second joining member. A friction stir welding method in which welding is performed by a welding head of a welding tool arranged on a front surface side of both welding members, and an engaged portion formed of a convex portion or a concave portion extends along a length direction in a part of the back surface in a width direction. Preparing the first joining member and the second joining member formed as described above, and engaging the convex portion of each joining member or the convex portion fitted into the concave portion of each joining member. A receiving jig that receives the back surface of the butting portion, and the back surface of the butting portion formed by abutting the widthwise end of the first joining member and the widthwise end of the second joining member, While receiving with the receiving jig, the engagement between the engaged portion of each joining member and the receiving jig And by engaged mating engagement the parts to hold the joining members to butt state, in this state, is characterized by joining the butt portion.

In this friction stir welding method, the first and second joining members arranged in a butt shape are received by a receiving jig on the back surface of the butt portion during friction stir welding, whereby the softened portion is formed. Is prevented from bulging to the back side of the butted portion. Further, in the case of friction stir welding, the engaged portion formed on the back surface of each joining member and the engaging portion of the receiving jig are fitted and engaged with each other, so that the joining members are butt-joined. The movement in the opposite direction is restricted, and the two joining members are held in the butted state, thereby preventing the butted portion from being opened. Thus, in each joining member, the engaged portion fitted to the engaging portion of the receiving jig is formed on a part of the back surface of the joining member.
For example, by forming the engaged portion at an intermediate portion in the width direction of the back surface of the joining member, a receiving jig having a smaller dimension between the pair of engaging portions than a conventional holding jig can be used. Thus, the receiving jig can be reduced in size. As a result, it becomes possible to mount the receiving jig with high work efficiency, thereby improving the bonding work efficiency.

[0014] In the present invention, at least one of a side surface of the joint member opposite to the joining direction in the convex portion and a side surface of the concave portion of the receiving jig opposite to the joint member in the joining direction is at least one of: When the pressing force is applied in the direction in which the back surface of the butted portion comes into close contact with the receiving jig under the state where the convex portion and the concave portion are fitted, a force in the butting direction is applied to both joining members. It is desirable to have a guide surface that has been adjusted.

According to this, for example, the surface of the butting portion receives a pressing pressure at the time of inserting a part (probe) of the joining head into the butting portion, or further receives another part (rotation) of the joining head. By receiving the pressing pressure of the end faces of the joints, the two joining members receive the force in the butting direction and try to move in the butting direction, so that the butted ends of the joining members come into close contact with each other. Therefore,
Even if the butt ends of the joining members are curved in the length direction, etc., and if the ends are brought into contact with each other, a gap is formed in the butt portion, According to this, the gap between the butted portions can be eliminated, and the butted portions can be joined in this state. As a result, it is possible to prevent a problem that air in the gap of the butt portion is entrained at the time of joining and a joining defect such as a void is generated at the joining portion, thereby obtaining a high-quality butt-joined product.

In the present invention, at least one of a side surface of the joint member in the butting direction of the joint member and a side surface of the projecting portion of the receiving jig in the joint direction of the joint member has a concave portion. A guide formed so that a force in the butting direction acts on both joining members when a pressing force is applied in a direction in which the back surface of the butting portion comes into close contact with the receiving jig under a state of fitting with the convex portion. Even if it has a surface, the same action as described above can be exerted.

Further, in the present invention, the receiving jig has a predetermined length, and the engaging portion is formed on the surface along the length direction, and the engaging portion is formed on the engaged portion. When the receiving jig is attached to the back surface of the butting portion, the engaging portion is fitted to the engaged portion along the engaged portion. Engage. As a result, the joining operation can be performed continuously,
As a result, the joining work efficiency is improved.

Further, in the present invention, when the receiving jig is constituted by a rotatable roller having the engaging portion formed on the entire peripheral surface thereof, the following operation is achieved. In other words, when this roller is rotatable, as the two joining members move relative to the joining head of the joining tool, the roller has its peripheral surface on the back surface of the butted portion. It is rotated in a state where it is brought into contact and a state where the engaging portion is fitted to the engaged portion. On the other hand, when this roller is driven to rotate,
The rotation is performed in a state where the peripheral surface is in contact with the back surface of the butted portion, and the engagement portion is fitted to the engaged portion, whereby the two joining members are moved. In each case,
The joining operation can be performed continuously, thereby improving the joining work efficiency.

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 6 show a first embodiment of the present invention, FIG. 7 shows a second embodiment of the present invention, and FIGS.
Shows a third embodiment of the present invention.

As shown in FIG. 1, in the first embodiment of the present invention, the two joining members (10A) and (10B) are made of long plate-like aluminum or an alloy thereof having a constant width. And are formed in the same shape and the same size as each other. In the same figure, the widthwise end (11) of the right joining member (first joining member, 10A) and the widthwise end (11) of the left joining member (second joining member, 10B). They are arranged facing each other. In the figure, (T) is
It is a butting portion formed by abutting an end portion (11) in the width direction of the right joining member (10A) and an end portion (11) in the width direction of the left joining member (10B). (H1) is the width dimension of the first joining member (10A), and (H2) is the width dimension of the second joining member (10B). In the first embodiment, the first joining member (10
A) width dimension (H1) and the second joining member (10B) width dimension (H
2) are both 400 mm or more, for example.

On the back surface of the butting portion (T), a strip-shaped metal receiving jig having substantially the same length as the length of the butting portion (T) of the two joining members (10A) (10B). (30)
Are arranged in such a manner as to straddle the butting portion (T).
It is mounted along. This receiving jig (30) is for receiving the back surface of the butting portion (T).

As shown in FIG. 6A, a probe (59) of a joining tool (57) described later is provided at an intermediate portion of the surface of the receiving jig (30) in the width direction (the left-right direction in FIG. 6). A receiving portion (31) is formed along the length direction of the abutting portion (T) so as to face the back surface of the butting portion (T) in a substantially surface contact state. The receiving portion (31) has a flat surface.

Further, on the left and right sides of the receiving portion (31) on the surface of the receiving jig (30), a pair of left and right concave portions (32) (32) as an engaging portion (Y) is provided in the longitudinal direction. It is formed along. Of the two side surfaces of each recess (32), the side surface (32a) on the opposite side in the butting direction (c) of the joining member is
The back of the butting part (T) is the receiving part (31) of the receiving jig (30)
With respect to the direction (d) in close contact with the receiving portion (31) (that is, the butting direction side of the joining member), the side surface (32a) is entirely formed on the guide surface (S). Functioning as

On the other hand, as shown in FIG.
A) A protruding portion (12) as an engaged portion (X) is integrally formed along the length direction near an abutting end portion (11) in a widthwise middle portion of the back surface of (10B). Is formed. Of the two side surfaces of each convex portion (12), the side surface (12a) opposite to the butting direction (c) of the joining member has the back surface of the butting portion (T) on the receiving portion of the receiving jig (30). In the direction (d) close to the direction (31), the inclined surface is inclined toward the end (11) to be abutted, and the entire side surface (12a) functions as the guide surface (S). . This side (12
The inclination angle of a) is set to be substantially equal to the inclination angle of the side surface portion (32a) of the concave portion (32) of the receiving jig (30).

Next, a procedure for mounting the receiving jig (30) on the back surface of the butting portion (T) will be described.

First, as shown in FIG. 6A, the widthwise end (11) of one joining member (10A) and the widthwise end (11) of the other joining member (10B) are connected. Match. In this embodiment, when the two joining members (10A) and (10B) are abutted, a small gap is formed in the abutting portion (T) as shown in FIG. This gap may be caused by the fact that the butted end (11) of each joining member (10A) (10B) is curved in the longitudinal direction, or irregularities formed by processing marks are formed at the butted end (11). This is caused by things being done.

Next, the receiving jig (30) is moved, and the receiving jig (30) is mounted on the back surface of the butting portion (T). Alternatively, both the joining members (10A) and (10B) are moved to mount the receiving jig (30) on the back surface of the butted portion (T). Here, for convenience of explanation, the receiving jig (30) is moved and the receiving jig (30) is mounted on the back surface of the butting portion (T).

During the mounting operation of the receiving jig (30),
The convex portions (12) of the joining members (10A) (10B) are fitted into the concave portions (32) (32) of the receiving jig (30), and the side surfaces ( 12a) on the side (3
2a) comes into contact in a substantially surface contact state.

By further moving the receiving jig (30), the side surface (32a) of each concave portion (32) slides on the side surface (12a) of the convex portion (12) and the concave portion (32) is joined to the joining member. (10A)
Move toward the back of (10B). With this move,
The side surface part (32a) of each concave part (32) presses the convex part (12) in the butting direction (c) and (c) of the joining members (10A) (10B), that is, on each joining member (10A) (10B). Butt direction (c)
The force of (c) acts. The joining members (10A) and (10B) move in the butting directions (C) and (C), respectively, by receiving the forces in the butting directions (C) and (C). By this moving operation, the butted ends (11) (1) of the joining members (10A) (10B)
1) The two are closely attached to each other, and the gap formed in the butted portion (T) disappears. Move the receiving jig (30) further, and
When the receiving part (31) comes into contact with the back surface of the butting part (T) as shown in (b), the butting part (T) of the receiving jig (30)
The mounting operation on the back surface and the operation of fitting the concave portion (32) to the convex portion (12) are completed.

When the receiving jig (30) is mounted,
The receiving part (3) of the receiving jig (30) is provided on the back side of the butting part (T).
1) is in contact with the abutting portion (T) in a substantially surface contact state. The butted ends (11) and (11) of the joining members (10A) and (10B) are in a state of mutual pressure contact. Further, each convex portion (12) and concave portion (32) are held so that the convex portion (12) is tightly fitted in the concave portion (32) and the two are engaged so that the fitted state is not released. Have been. In other words, the side surface (12a) of each convex portion (12) and the side surface (32a) of the concave portion (32) are pressed against each other and held so that the fitted state is not released by the frictional force accompanying the pressure. As a result,
The movement of each joining member (10A) (10B) in the direction opposite to the butting direction (c) is regulated, and thus both joining members (10A) (10
B) is held in the butted state.

Next, while holding the two joining members (10A) and (10B) in the butted state, together with the receiving jig (30), FIG.
5 is set in the friction stir welding apparatus (50) shown in FIG.

Here, the configuration of the friction stir welding apparatus (50) will be described.

In FIG. 1, (57) is a welding tool for friction stir welding. The joining tool (27) includes a large-diameter cylindrical rotor (58), and a small-diameter pin-shaped probe (59) protruding on an axis of an end face (58a) of the rotor (58). A joining head (D) is provided. The rotor (58) and the probe (59) are made of a heat-resistant material that is harder than the joining members (10A, 10B) and can withstand frictional heat generated during joining. Further, a convex portion (not shown) for stirring the softening portion is formed on the peripheral surface of the probe (59). The joining tool (57) is arranged in such a manner that its probe (59) faces downward on the surface side of both joining members (10A) (10B) arranged in abutting manner.

(55) is a receiving roller. As shown in FIG. 2, the receiving roller (55) is connected to the probe (59) of the joining tool (57) with a predetermined gap between the two joining members (10A).
It is arranged on the back side of (10B) in such a manner that its peripheral surface faces the probe (59). This receiving roller (55)
Is a drive roller that is rotatable and has a drive device (not shown), and moves both joining members (10A) and (10B) to one side of the length direction (the direction of the arrow B). Also works. In this embodiment, the receiving roller (55) may be rotatable.

Reference numeral (51) denotes a first drive roller for moving the two joining members (10A) and (10B) in a predetermined direction (B). The first drive roller (51) is disposed behind the receiving roller (55) in the moving direction (b) of the joining members (10A) (10B) and on the back side of both joining members (10A) (10B). . (53)
Is the same direction for both joining members (10A) (10B)
The second drive roller is moved to the second position. The second driving roller (53) is moved in the moving direction (b) of the joining members (10A) (10B).
Both joining members (10A) in front of the receiving roller (55)
It is arranged on the back side of (10B).

(52) and (54) are a pair of left and right rotatable pressing rollers. These holding rollers (52) (54)
Are arranged at predetermined intervals above the drive rollers (51) and (53) on the front surface side of the joining members (10A) and (10B). Each of the pressing rollers (52) and (54) is driven by a driving roller (51) with a receiving jig (30) holding the two joining members (10A) and (10B) or the two joining members (10A) and (10B) in an abutting state.
By pressing against the peripheral surface of (53), both joining members (10
A) This is for applying a driving force in the moving direction (b) to (10B).

The butting portion (T) of the two joining members (10A) (10B) held in the butted state by the receiving jig (30) is subjected to the following friction stir welding (50) by the friction stir welding device (50). In this manner.

First, in a state where the probe (59) of the joining tool (57) is on standby at the upper separated position, the two joining members (10A)
The one end in the length direction of (10B) is passed between the first driving roller (51) and the pressing roller (52), which are rotationally driven, together with the receiving jig (30).

Thus, the joining members (10A) and (10B) receive the pressing pressure of the pressing roller (52), so that the receiving jig (10A) holding the joining members (10A) and (10B) in a butted state. 30) is pressed against the peripheral surface of the first drive roller (51), and the first drive roller (5) is applied to both joining members (10A) (10B).
A driving force in the moving direction (b) is applied from 1). Receiving this driving force, the joining members (10A) and (10B) move together with the receiving jig (30) toward the space between the receiving roller (55) and the probe (59) in a butted state. FIG.
As shown in (b), when the pressing force of the pressing roller (52) is received by the two joining members (10A) and (10B), the two joining members (10A) and (10B) are brought into contact with the back surface of the butted portion (T). Moves in the direction in which it comes into close contact with the receiving portion (31) of the receiving jig (30), and this moving operation causes the joining members (10A) (10
The convex portion (12) of B) slides on the side surface (32a) of the concave portion (32) of the receiving jig (30), so that each joining member (10A) (10
Since the forces in the butting directions (c) and (c) act on B), the joining members (10A) and (10B) receive the force in the butting directions (c) and (c) to cause the joining members (10A) and (10B) to face in the butting directions (c) and (c). As a result, the butted ends (11) and (11) strongly adhere to each other.

When the expected joining start position of the butting portion (T) of the joining members (10A) (10B) reaches above the receiving roller (55), the movement of the joining members (10A) (10B) is temporarily stopped. I do. Then, the probe (59) is lowered while rotating. When the tip of the probe (59) comes into contact with the surface of the butting portion (T), the contact portion is softened by frictional heat.
9) is pressed against the surface of the butting portion (T), and the probe (59) is pressed into the butting portion (T) by the receiving portion (3) of the receiving jig (30).
Insert while making it face 1), and press the end face (58a) of the rotor (58) against the surface of the butted portion (T). In this state, the positions of the rotor (58) and the probe (59) are fixed. By pressing the end face (58a) of the rotor (58) against the surface of the butt portion (T), it is possible to prevent the softened portion softened by frictional heat from scattering and form a bonded portion (W) having high bonding strength. And a junction (W) having a flat surface can be formed.

As shown in FIG. 4B, the surface of the butting portion (T) receives a pressing pressure when the welding tool (57) is inserted into the butting portion (T) of the probe (59). Or by receiving the pressing pressure (e) on the end face (58a) of the rotor (58) of the joining tool (57), the two joining members (10A) and (10B) Attempts to move in a direction in which the receiving jig (30) comes into close contact with the receiving part (31), and this moving operation causes the convex part (12) of each of the joining members (10A) (10B) to move into the concave part of the receiving jig (30). (32) side (32
a), the force in the butting directions (c) and (c) acts on the joining members (10A) and (10B), and the joint members (10A) and (10B) receive the force in the butting directions (c) and (c). Material (10A)
As a result of (10B) moving in the butting directions (c) and (c), the butted ends (11) and (11) strongly adhere to each other.

As shown in FIG. 2, the joining tool (57) is slightly inclined in the direction of movement (b) of the two joining members (10A) (10B). (Five
9) is inserted into the butting portion (T), the two joining members (10A) (10A) on the end face (58a) of the rotor (58)
The part on the moving direction (b) side of B) comes into pressure contact with the surface of the butted part (T), and the opposite side of the moving direction of the two joining members (10A) (10B) on the end face (58a) of the rotor (58). Is slightly raised from the surface of the butted portion (T). The probe (59) is lowered in advance, and the probe (59) is forcibly passed between the probe (59) and the receiving roller (55) by forcibly passing both the joining members (10A) and (10B). The probe (59) is inserted into the butting part (T) from the front end in the moving direction of both joining members (10A) (10B).
May be inserted into the butting portion (T).

Next, the receiving roller (55) and the first driving roller (51) are driven again. Probe (5)
The two joining members (10A) and (10B) into which 9) are inserted are driven by the driving force applied from the receiving roller (55) and the first driving roller (5).
By the driving force applied from 1), the butting part (T)
Move sequentially past the probe (59),
In the abutting state, it is passed along with the receiving jig (30) between the rotating second driving roller (53) and the pressing roller (54).

As described above, the two joining members (10A) and (10B) are moved so that the butting portion (T) passes through the probe (59) sequentially, so that the two joining members (10A) and (10B) are moved by the probe. At the passage portion of (59), that is, over the entire area of the butted portion (T), the portions are joined and integrated. In other words, the frictional heat generated by the rotation of the probe (59) or the frictional heat generated by the sliding between the end face (58a) of the rotor (58) and the surface of the butting portion (T) causes the probe (59) to move. In the contact area with the joint and its vicinity, both joining members (10A) (10
B) is softened, and the softened portion is stirred by receiving the rotational force of the probe (59), and the softened and stirred portion fills the passage groove of the probe (59) by receiving the traveling pressure of the probe (59). After the plastic flow, the frictional heat is rapidly lost and the solidified material is cooled. This phenomenon is sequentially repeated with the movement of the two joining members (10A) and (10B), and finally, the butt portion (T) is joined over the entire area, and the two joining members (10A, 10B) are joined.
A) (10B) is integrated.

Generally, when the probe (59) is inserted into the butting portion (T), the butting portion (T) is inserted into the probe (5).
When the two joining members (10A) and (10B) are moved with the probe (59) inserted into the butting portion (T) while the probe (59) is inserted into the butting portion (T) under the insertion pressure of 9), the butting portion (T) Tries to open in the left-right direction when passing through the probe (59).
However, according to this friction stir welding method, the projection (12) of each joining member (10A) (10B) and the concave portion (32) of the receiving jig (30) are fitted and engaged, and each joining member (10A) (10B) is engaged. Because movement in the opposite direction of the butting direction of 10A) and (10B) is regulated,
The butting portion (T) does not open, and no gap is generated in the butting portion (T). Therefore, according to this friction stir welding method, in a state where no gap is generated in the butted portion (T), in other words, in a state where the butted end portions (11) and (11) are in close contact with each other, the butted portion is formed. (T) is joined, and therefore, a problem that air in the gap of the butted portion (T) is entrained at the time of joining and a joining defect such as a void occurs at the joined portion (W) is prevented.

Further, since the back surface of the butting portion (T) is received by the receiving portion (31) of the receiving jig (30), the softened portion softened by the frictional heat expands toward the back surface of the butting portion (T). No problem occurs. Therefore, the back surface of the joint (W) is formed flat.

As described above, according to this friction stir welding method, no void is generated in the joint (W), and the back surface of the joint (W) is formed in a flat shape. Is obtained.

Further, according to this friction stir welding method, in order to hold the two joining members (10A) and (10B) in abutting state, a receiving jig (30) is provided between the pair of recesses (32) and (32). Dimensions of the joint members arranged in a butt shape (10A) (10B)
What is necessary is just to use the one set so as to correspond to the distance between the projections (12), (12), so that the receiving jig (30) can be downsized. For this reason, the receiving jig (30) can be mounted with high work efficiency, and thus the joining work efficiency is improved. Further, as described above, by performing the mounting operation of the receiving jig (30) on the back surface of the butting portion (T), the concave portion (32) and the convex portion (12) are fitted and engaged, so that the two joining members are engaged. Since (10A) and (10B) are held in the butted state, the mounting operation of the receiving jig (30) on the back surface of the butted portion (T) and the fitting operation of the concave portion (32) and the convex portion (12) are performed. There is an advantage that the two operations can be performed simultaneously without having to perform the operations separately.

In this friction stir welding method, after the receiving jig (30) is necessarily attached to the back surface of the butting portion (T), the two joining members (10A) and (10B) are connected to the friction stir welding device (50). It is not necessary to set the receiving jig (30) while passing the two joining members (10A) (10B) arranged in abutting state between the first driving roller (51) and the pressing roller (52).
May be attached to the back surface of the butting portion (T).

In this friction stir welding method, the projections (12) and (12) of both joining members (10A) and (10B) are not necessarily required.
It is not necessary that both side portions (12a) and (12a) have the guide surface (S), and only the side surface portion of the convex portion of one of the joining members may have the guide surface. Further, the side surfaces (32a) and (32a) of the pair of left and right recesses (32) and (32) of the receiving jig (30) do not necessarily have to have the guide surface (S), and any one of the recesses may be provided. May have a guide surface only.

Further, a convex portion (12) may be formed along the length direction on the back surface of the end (11) where the joining members (10A) and (10B) abut.

In the friction stir welding method according to the second embodiment shown in FIG. 7, the vicinity of the abutting end (11) at the widthwise middle portion of the back surface of each of the joining members (10A) (10B) is respectively covered. A concave portion (14) as an engaging portion (X) is formed along the length direction. Of the two side surfaces of each recess (14), the side surface (14a) on the side in which the joining member abuts in the direction (C) has the back surface of the abutting portion (T) and the receiving portion (31) of the receiving jig (30). The side surface (14a) functions as a guide surface (S). The inclined surface is inclined toward the end (11) to be abutted against the close direction.

On the other hand, on the left and right sides of the receiving portion (31) on the surface of the receiving jig (30), a pair of left and right convex portions (34) as an engaging portion (Y) are integrally formed along the length direction. Have been. Of the two side surfaces of each protrusion (34), the side surface (34a) of the joining member in the butting direction side has the back surface of the butting portion (T) in close contact with the receiving portion (31) of the receiving jig (30). It consists of an inclined surface inclined toward the receiving portion (31) with respect to the direction, and the entire side surface portion (34a) functions as a guide surface (S).

This receiving jig (30) is used as both joining members (10A)
(10B) with the bonding member (1
The butted end portions (11) and (11) of (0A) and (10B) are in a mutually press-contact state as in the case of the first embodiment. Further, the concave portion (14) and the convex portion (34) are held so that the convex portion (34) is tightly fitted in the concave portion (14) and the two are engaged so that the fitted state is not released. That is, the side surface portion (14a) of each concave portion (14) and the side surface portion (34a) of the convex portion (34) are pressed against each other and held so that the fitted state is not released by the frictional force accompanying the pressure. . Therefore, the movement of each joining member (10A) (10B) in the opposite direction of the butting direction is regulated, and thus the two joining members (10A) (10B) are held in the butted state.

The agitated joining method of the second embodiment is performed in the same procedure as the first embodiment, and has the same advantages as the first embodiment.

In the friction stir welding method according to the third embodiment shown in FIGS. 8 and 9, two joining members (10A) and (10B)
The configuration is the same as that of the first embodiment.

On the other hand, in the friction stir welding method of the third embodiment, as shown in FIG. 9, the receiving roller (55) of the friction stir welding device (50) is used as the receiving jig (30). . That is, on the peripheral surface of the receiving roller (55), a receiving portion (31) and a pair of left and right concave portions (32) and (32) as engaging portions (Y) are provided on both left and right sides of the receiving portion (31). Are formed over the entire circumference. Of the two side surfaces of each recess (32), the side surface (32a) of the joining member opposite to the butting direction has the back surface of the butting portion (T) in close contact with the receiving portion (31) of the receiving jig (30). The tapered surface is inclined toward the receiving portion (31) with respect to the direction of the rotation. The entire side surface portion (32a) functions as a guide surface (S).

Further, in the friction stir welding apparatus (50), as shown in FIG. 8, an auxiliary receiving portion (35) and an auxiliary receiving portion (35) are provided on the peripheral surface of the first drive roller (51). A pair of left and right concave portions (32) as engaging portions (Y) on both left and right sides
(32) are formed over the entire circumference. Although not shown, the second drive roller (53) has the same configuration as the first drive roller (51). Each drive roller (5
1) The auxiliary receiving portion (35) and the concave portion (32) of (53) have the same configuration as the receiving roller (55).

In this friction stir welding method, two joining members (10A) (10A) arranged in a butt shape are passed between the first drive roller (51) and the pressing roller (52). 8), the two joining members (10A) and (10B) receive the pressing force of the pressing roller (52).
A) (10B) is pressed against the peripheral surface of the first driving roller (51), and a driving force in the moving direction is applied from the first driving roller (51). At the same time, when the pressing force of the pressing roller (52) is received by the two joining members (10A) and (10B), the two joining members (10A) and (10B) are brought into contact with the back surface of the butted portion (T) by the first drive roller (51). ) Moves in a direction close to the auxiliary receiving part (35). By this moving operation, the back surface of the butting portion (T) comes into contact with the auxiliary receiving portion (35) of the first drive roller (51), and the convex portion (12) of each of the joining members (10A) (10B) and the 1
The concave portion (32) of the drive roller (51) is fitted and engaged. As a result, the two joining members (10A) (10B) are held in a butted state.

The two joining members (10A) and (10B) held in abutting state by the first drive roller (51) are also used when passing between the receiving roller (55) and the probe (59) (FIG. 9), but kept in a butted state. That is, the surface of the butt portion (T) receives a pressing pressure when the probe (59) of the joining tool (57) is inserted into the butt portion (T), or furthermore, the rotor of the joining tool (57) ( By receiving the pressing pressure of the end face (58a) of the 58), both joining members (1
0A) and (10B), but the receiving roller (5
5) Move in the direction that comes into close contact with the receiving part (31). By this moving operation, the back surface of the butting portion (T) and the receiving portion (31) come into contact with each other, the back surface of the butting portion (T) is received by the receiving portion (31), and the joining members (10A) (10B ) Engages with the concave portion (32) of the receiving roller (55). As a result, the two joining members (10A) (10B) are held in a butted state. In addition, by this moving operation, the convex portion (12) of each joining member (10A) (10B) slides on the side surface portion (32a) of the concave portion (32) of the receiving roller (30). ) Since a force in the butting direction acts on (10B), the joining members (10A) and (10B) receive the force in the butting direction.
As a result, the butted ends strongly adhere to each other.

Further, when the two joining members (10A) and (10B) pass between the second driving roller and the pressing roller,
Although not shown, the back surface of the butting portion (T) and the auxiliary receiving portion of the second drive roller come into contact with each other, and the back surface of the butting portion (T) is received by the auxiliary receiving portion.
By fitting the convex portion (12a) and the concave portion (32) of (10B), the butted state is maintained.

In this state, the receiving roller (55) and the respective driving rollers (51) and (53) have their receiving part (31) and auxiliary receiving part (35) abut against the back surface of the butting part (T). In this state, the concave portion (32) is rotationally driven at a fixed position with the concave portion (32) fitted to the convex portion (12) of each joining member (10A) (10B). As a result, the joining members (10A) and (10B) are moved in a predetermined direction so that the butting portion (T) sequentially passes through the probe (59), whereby the butting portions (T) are joined and the joining members (10) are joined.
A) (10B) is integrated.

In the third embodiment, although not shown, a concave portion is formed in a part of the back surface of each of the joining members (10A) (10B), while the receiving roller (55) and each driving roller ( 51) A convex portion may be formed on the peripheral surface of (53).

In the third embodiment, the receiving roller (55) may be rotatable.

Further, the friction stir welding method according to the present invention has the following advantages.

As shown in FIG. 10, for example, the joining members (10A), (10B), and (10C) used in the first embodiment are replaced by three.
Using or more joining members,
In order to finally produce a wide butt-joined product by joining and integrating these components, the receiving jig (30) is removed after the joining of the butt portion (T), and the butt is to be joined next. Attached to the back of the part (T). By joining the butt portions (T) one after another in this manner, a wide butt-joined product can be manufactured. That is, according to the friction stir welding method according to the present invention, as the receiving jig (30) for joining a plurality of butted portions (T).
Since it is sufficient to prepare receiving jigs of at least one type, it is not necessary to prepare receiving jigs of various sizes, and as a result, the manufacturing cost of the butt-joined product can be reduced.

The embodiments of the present invention have been described above.
The present invention is not limited to these embodiments, and can be variously modified.

For example, the projection (1) as the engaged portion (X)
2) Side surface (12a) or recess (14) side (14a)
And the side surface portion (32a) of the concave portion (32) as the engaging portion (Y)
Alternatively, only one of the side surface portion (34a) of the convex portion (34) may have the guide surface (S).

Further, according to the present invention, the probe () 59 of the welding tool (57) is inserted into the butt portion (T), and the probe () 59 is moved along the butt portion (T). It is also applicable to friction stir welding for joining (T).

[0070]

As described above, according to the present invention, since the engaged portion is formed on a part of the back surface of each joining member in the width direction, a pair of engaging portions is formed as a receiving jig. Since the distance between the holding jigs can be smaller than that of the conventional holding jig, and the receiving jig can be reduced in size, the receiving jig can be mounted efficiently and the joining work can be performed. This has the effect of improving efficiency.

Also, at least one of the side face of the projecting portion of each joining member opposite to the butting direction and the side face of each recess of the receiving jig opposite to the joining direction of the joining member is in a fitted state. When a pressing force is applied in a direction in which the back surface of the butt portion comes into close contact with the receiving jig, when both the joining members have a guide surface formed so that a force in the butt direction is applied. For example, the surface of the butting portion receives a pressing pressure when a part (probe) of the joining head is inserted into the butting portion, or further, a pressing pressure of another portion (the end face of the rotor) of the joining head. As a result, the two joining members receive the force in the butting direction and try to move in the butting direction. As a result, the butted ends of the joining members come into close contact with each other. Butted Even when a gap is formed in the butted portion when the ends are abutted with each other due to, for example, the portion curving in the length direction, the gap between the butted portions can be eliminated, and in this state the butted portion can be eliminated. Can be joined, so that a high-quality butt-joined product can be obtained.

In addition, at least one of the side surface of the joint member in the abutting direction side in the concave portion and the side surface portion of the convex portion of the receiving jig in the abutting direction of the joint member is engaged in a fitted state. When the pressing force is applied in the direction in which the back surface of the butting portion comes into close contact with the receiving jig, even if the joining member has a guide surface formed such that a force in the butting direction acts on both joining members, It has the same effect as.

Further, the receiving jig has a predetermined length, and an engaging portion is formed on the surface along the length direction.
When the engaging portion is a band-shaped member fitted along the engaged portion, the joining operation can be performed continuously, so that the joining operation efficiency can be improved. it can.

Similarly, when the receiving jig is formed of a rotatable roller having an engaging portion formed on the entire peripheral surface, the joining operation can be performed continuously. Therefore, the efficiency of the joining operation can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a friction stir welding method according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3A is a sectional view taken along line III-III in FIG. 1, and FIG. 3B is an enlarged view of a main part thereof.

4A is a sectional view taken along line IV-IV in FIG. 1, and FIG. 4B is an enlarged view of a main part thereof.

FIG. 5 is a sectional view taken along line VV in FIG. 1;

FIG. 6A is a cross-sectional view illustrating a state in which a receiving jig is being mounted on the back surface of both joining members, and FIG. 6B is a cross-sectional view illustrating a state after the receiving jig is mounted on the back surface of both joining members. FIG.

FIGS. 7A and 7B are diagrams showing a friction stir welding method according to a second embodiment of the present invention, wherein FIG. 7A is a diagram corresponding to FIG. 4A and FIG. 7B is a diagram corresponding to FIG. .

FIG. 8 is a view showing a friction stir welding method according to a third embodiment of the present invention and corresponding to FIG. 3 (a).

FIG. 9 shows a friction stir welding method according to the third embodiment,
It is a figure corresponding to (a).

FIG. 10 shows a friction stir welding method according to the first embodiment.
In the case of manufacturing a wide butt-joined product by butt-joining three joining members, (a) is a cross-sectional view when joining a butt portion, and (b) is a cross-sectional view when joining another butt portion. It is.

FIG. 11 is a cross-sectional view showing a conventional friction stir welding method.

12A and 12B are cross-sectional views when a butt portion is joined in a case where a wide butt joint product is manufactured by butt joining three joining members by a conventional friction stir welding method.
(B) is sectional drawing at the time of joining another butting part.

[Explanation of symbols]

 10A, 10B ... joining member 12 ... convex part (engaged part X) 12a ... side surface part (guide surface S) 14 ... concave part (engaged part X) 14b ... side surface part (guide surface S) 30 ... receiving jig 31 ... receiving part 32 ... concave part (engaging part Y) 32a ... side part (guide surface S) 34 ... convex part (engaging part Y) 34a ... side part (guide surface S) 50 ... friction stir welding device 55 ... receiving part Roller 57 ... joining tool 58 ... rotor 59 ... probe D ... joining head T ... butting part W ... joining part

Claims (4)

[Claims] 1. An end (1) in a width direction of a first joining member (10A).
A butting portion (T) formed by abutting the 1) and the end (11) in the width direction of the second joining member (10B) is joined by a joining head (D) of a joining tool arranged on the surface side of both joining members. A first method in which an engaged portion (X) formed of a convex portion (12) or a concave portion (14) is formed along a length direction on a part of the back surface in the width direction.
A joint member (10A) and a second joint member (10B) are prepared, and are fitted into the concave portions (32) into which the convex portions (12) of each joint member are fitted or the concave portions (14) of each joint member. Convex part (3
4) using a receiving jig (30) for receiving the back surface of the butt portion, the end portion (11) in the width direction of the first joining member (10A) and the second joining member. The receiving jig (30) receives the back surface of the butted portion (T) formed by abutting the end portion (11) in the width direction of (10B) with the receiving portion (X) of each joining member. A friction stir welding method characterized in that the two joining members are held in a butted state by fittingly engaging the engaging portion (Y) of the jig, and the butted portion (T) is joined in this state. . 2. A side surface portion (12a) of the joining member opposite to the butting direction in the projecting portion (12) and a side surface portion (32a) of the receiving member in the recess portion (32) of the receiving member opposite to the joining direction. ), Or at least one of the side surfaces (14
a) and at least one of the side portions (34a) of the joint member in the butting portion (34) of the receiving jig in the butting direction, the back surface of the butting portion (T) is in a fitted state. The guide surface (S) formed so that a force in the butting direction (c) acts on both the joining members (10A) and (10B) when a pressing force acts in a direction in which the receiving jig (30) comes into close contact with the receiving jig (30). The friction stir welding method according to claim 1, further comprising: 3. The receiving jig (30) has a predetermined length, the engaging portion (Y) is formed on a surface thereof along a length direction, and the engaging portion (Y) is The friction stir welding method according to claim 1 or 2, wherein the friction stir welding method is a belt-like shape fitted along the engaged portion (X). 4. The friction stir welding method according to claim 1, wherein the receiving jig (30) is formed of a rotatable roller having the engaging portion (Y) formed on the entire peripheral surface thereof. .