JP2023039128A - Guide block and friction stirring and joining method - Google Patents

Abstract

To provide a guide block and a friction stirring and joining method which can press a pair of joined members forming an inner corner part even when the surfaces of the joined members are curved surfaces, and can suppress floating and vibration.SOLUTION: A guide block 20 has a guide hole 22 rotatably holding a stirring pin 11, a guide roller 24 arranged on the side of the guide hole 22, and a pair of contact surfaces (a first contact surface 33 and a second contact surface 34) oppositely arranged across the guide hole 22, wherein the guide roller 24 can be rotated to each surface (an end face 7, a surface 8) of a pair of joined members (a cylindrical body 5, a joint 6), and in the pair of contact surfaces, one (a first contact surface 33) can be brought into contact with one (an end face 7 of a cylindrical body 5) of the pair of joined members, and the other (a second contact surface 34) can be brought into contact with the other (a surface 8 of a joint 6) of the pair of joined members.SELECTED DRAWING: Figure 2

Description

The present invention relates to a guide block for inner corner friction stir welding and a friction stir welding method.

A rotary tool for inner corner welding, in which a triangular prism-shaped base block is attached to a stir pin, is used when friction stir welding is performed on a pair of members to be welded that form an inner corner (Patent Document 1).
The base block rotatably holds and guides the stirring pin, and the pair of inclined surfaces abuts against the surfaces of the pair of members, respectively, so that the members to be welded can be held down to suppress lifting and vibration.

JP 2011-79031 A

In the rotary tool for joining the inner corners of Patent Document 1 described above, the pair of inclined surfaces formed on the base block are flat surfaces, and if the surfaces of the pair of members to be joined are flat surfaces, they are in surface contact with each other. By doing so, it is possible to suppress lifting and vibration by holding down the members to be joined.
However, if only one of the pair of members to be joined has a non-flat surface, line contact or point contact may occur, and lifting and vibration cannot be suppressed by pressing the member to be joined.

For example, when joining a tubular joint to the inner side of the end of a tubular body, the end face of the outer tubular body is flat, but the surface of the inner joint is a cylindrical surface. When friction stir welding is performed on an annular inner corner formed by such a flat surface and a cylindrical surface, when a rotating tool for inner corner welding in which a pair of inclined surfaces are both flat is used, the flat surface The inclined surface of , cannot come into surface contact with the surface of the joint, which is a cylindrical surface, but comes into line contact. As a result, the base block is in an unstable state in which the base block can be rotated around the contact line, and it becomes impossible to suppress the lifting and vibration by holding down the members to be joined.

SUMMARY OF THE INVENTION An object of the present invention is to provide a guide block and a friction stir welding method capable of suppressing lifting and vibration by holding down members to be welded even if the surfaces of a pair of members forming an inner corner are curved surfaces.

The guide block of the present invention is a guide block that presses a member to be joined to be friction stir welded against an inner corner formed by a pair of members to be joined, and has a guide hole that rotatably holds the agitation pin. , a guide roller arranged on the side of the guide hole, and a pair of contact surfaces arranged on opposite sides of the guide hole, wherein the guide roller is provided for the pair of members to be joined. It is possible to roll on each surface, and one of the pair of contact surfaces can contact one of the pair of members to be joined, and the other can contact the other of the pair of members to be joined. characterized by

In the present invention as described above, the agitation pin and the guide block are brought close to the inner corners of the pair of members to be welded while the agitation pin is inserted through the guide hole. Then, a pair of contact surfaces and a guide roller arranged across the guide hole are brought into contact with respective surfaces of the pair of members to be welded to press the members to be welded, and a rotating agitating pin is used to rotate the pair of members to be welded. Friction stir welding is performed at the intersection of the members.
At this time, the pair of contact surfaces and the guide roller contact the pair of engaged members at two points apart from each other. These two points of contact can be maintained regardless of whether the surfaces of the pair of members to be joined are flat or curved. Therefore, even if the surfaces of a pair of members to be joined are both flat, or if one of them is curved or both are curved, the pair of contact surfaces on both sides of the guide hole and the guide roller are By abutting on each two points of the pair of members to be joined, the members to be joined can be pressed to suppress lifting and vibration.
It should be noted that the range of curved surfaces in which two points of contact can be maintained on the member to be welded varies according to the distance between the guide roller and the pair of contact surfaces, the size and shape of each, and the like. Moreover, it is preferable to adjust the projection length of the stirring pin held in the guide hole according to the curvature of the surface of the member to be joined.

In the guide block of the present invention, it is preferable that the guide roller is spherical.
In this aspect of the invention, since the guide rollers are spherical, even if the angle between the pair of members to be joined, that is, the angle formed by the pair of surfaces forming the inner corners of the pair of members to be joined, is different, the contact with each of the members to be joined is maintained. It is possible to appropriately hold down the members to be joined, thereby suppressing lifting and vibration.
The spherical guide roller is not limited to a complete sphere as a whole. I wish I had.

In the guide block of the present invention, it is preferable that the guide roller has a flat spherical shape with a short rolling axis direction.
In the present invention, since the guide rollers are flat and the radius of the outermost circumference is large, the inner corners of the pair of members to be joined can be introduced even at a small pinching angle, and the range of application can be expanded.

In the guide block of the present invention, it is preferable that the guide rollers have a pair of conical shapes joined together at their bottom sides.
According to the present invention, if the angle formed by the generatrices of the pair of conical shapes and the angle between the pair of members to be welded are made to coincide, the pair of conical surfaces formed on the guide rollers will form one side of the members to be welded. and the other by a line rather than a point, and can appropriately hold down the member to be joined to suppress lifting and vibration.
That is, when the guide rollers are spherical, the guide block has room to rotate about the line segment passing through the center of the guide roller with respect to each member to be joined. On the other hand, with a pair of conical shapes, there is no room for such rotation, and the orientation of the guide block with respect to the non-contact member is uniquely determined. However, the angle between the members to be joined that can be applied is limited according to the conical shape of the guide roller.

In the guide block of the present invention, it is preferable that the guide roller is cylindrical.
In this aspect of the invention, both edges of the cylindrical guide roller can roll on the pair of members to be welded. Further, since the guide roller is cylindrical, manufacturing becomes extremely easy.
In addition, in the cylindrical guide roller, it is preferable to chamfer both end edges that roll on the pair of members to be joined into a conical surface or a spherical surface.

In the guide block of the present invention, the guide rollers are a pair of disk-shaped members arranged in parallel, one of the disk-shaped members being capable of coming into contact with one of the members to be joined, and the other of the disk-shaped members being the It is preferable to be able to abut on the other of the members to be joined.
In the present invention as described above, among the pair of disk-shaped members, one that abuts on one member to be joined and one that abuts on the other member to be joined are separated. Therefore, even if the linear velocities at the respective contacting portions are different depending on the attitude of the guide block and the pair of members to be joined, the members to be joined and the disk-like member on each side can roll reliably, Slipping can be prevented.
Furthermore, since the guide roller is formed by a pair of disk-shaped members, manufacturing can be facilitated while reducing materials.
A pair of disk-shaped members used as guide rollers can be supported by the same rotating shaft. A collar can be arranged between the pair of disk-shaped members to maintain their respective positions. In order to prevent tilting with respect to the rotating shaft, the portion of the pair of disk-shaped members inserted into the rotating shaft can have a predetermined length (thickness as a disk-shaped member) in the longitudinal direction of the rotating shaft. In order to properly roll against the members to be joined, the peripheral edge of the disk-shaped member may have an arcuate cross-sectional shape.

In the guide block of the present invention, the pair of contact surfaces are a first contact surface and a second contact surface that intersect with each other at a predetermined crossing angle, and the guide hole is formed in the first contact surface and the second contact surface. It is preferably arranged on the boundary line of the intersection with the contact surface or its extension line.
As for the angle of intersection between the first contact surface and the second contact surface, the first contact surface and the second contact surface are at It can be an angle to make. Alternatively, it may be an angle formed by the first contact surface and the second contact surface on a virtual plane perpendicular to the joining line where the first contact surface and the second contact surface are joined.
In this aspect of the invention, the stirring pin inserted through the guide hole can be held toward the intersection of the first contact surface and the second contact surface, that is, the intersection of the pair of members to be welded, While guiding the stir pin in a state suitable for friction stir welding, the pair of members to be welded can be pressed to suppress lifting and vibration.

In the guide block of the present invention, it is preferable that the first contact surface is a cylindrical surface and the second contact surface is a flat surface.
In the present invention, for example, when a tubular joint is joined to the inner side of the end portion of the tubular body, the end surface of the outer tubular body and the second abutment surface are in close contact with each other with flat surfaces. The surface of the joint and the first contact surface can be brought into close contact with each other with cylindrical surfaces. As a result, the guide block is stably held on the end surface of the outer cylindrical body and the surface of the inner joint, and presses the pair of joined members to suppress lifting and vibration.

In the guide block of the present invention, it is preferable that both the first contact surface and the second contact surface are conical surfaces.
In the present invention, for example, when joining the ends of a cylindrical body having inclined surfaces chamfered obliquely on the outer peripheral edge, the respective inclined surfaces are conical first contact surfaces and first contact surfaces. The two abutment surfaces can be in close contact with each other. Accordingly, the guide block is stably held on the inclined surfaces of the pair of cylinders, and can suppress the pair of members to be joined to prevent them from rising and vibrating.

The friction stir welding method of the present invention comprises a guide hole for rotatably holding an agitation pin when performing friction stir welding on an inner corner formed by a pair of members to be welded; and a pair of abutment surfaces arranged on opposite sides of the guide hole, and the guide roller is rolled onto the surface of each of the pair of members to be joined. One of the pair of contact surfaces is brought into contact with one of the pair of members to be joined, and the other is brought into contact with the other of the pair of members to be joined.
According to such a friction stir welding method of the present invention, the effects as described for the guide block of the present invention can be obtained.

ADVANTAGE OF THE INVENTION According to this invention, the guide block and friction stir welding method which can hold|suppress a to-be-joined member and can suppress a floating and vibration are provided even if the surface of a pair of member which forms an inner corner is a curved surface.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the friction stir welding of 1st Embodiment of this invention. The front view of the guide block of the said 1st Embodiment. The top view of the guide block of the said 1st Embodiment. The side view of the roller side of the guide block of the said 1st Embodiment. The side view of the contact surface side of the guide block of the said 1st Embodiment. The perspective view which shows the friction stir welding of 2nd Embodiment of this invention. The side view of the guide block of 3rd Embodiment of this invention. The side view of the guide block of 4th Embodiment of this invention. The side view of the guide block of 5th Embodiment of this invention. The side view of the guide block of 6th Embodiment of this invention.

An embodiment of the present invention will be described below with reference to the drawings.
[First embodiment]
1 to 4 show a first embodiment of the invention.
In FIG. 1, in this embodiment, friction stir welding is performed on an inner corner portion 4 of a workpiece 3 using an inner corner welding rotary tool 10 mounted on a spindle 2 of a machine tool 1 .
The workpiece 3 to be joined is composed of a cylindrical body 5 and a cylindrical joint 6 joined to the inside of the end portion thereof. is.
In this embodiment, the joint 6 having the cylindrical surface 8 corresponds to one member to be joined in the present invention, and the cylinder 5 having the flat end surface 7 corresponds to the other member to be joined in the present invention. The inner corner 4 is formed between the end face 7 and the surface 8, and the included angle, that is, the angle formed by the end face 7 and the surface 8 is 90 degrees.

2, 3, 4, and 5, the rotary tool 10 for welding inner corners is configured by mounting a guide block 20 on a stirring pin 11 for friction stir welding.
The guide block 20 has a plate-like base portion 21 formed by cutting a metal material or the like.
A guide hole 22 for rotatably holding the stirring pin 11 is formed in the central portion of the base portion 21 .
The guide hole 22 has a bearing (not shown) inside and can rotatably hold the stirring pin 11 . A thrust bearing is included in the bearing of the guide hole 22, and the stirring pin 11 is inserted into the guide hole 22 along the center axis 22C from above in the drawing, and is restricted from advancing in the states shown in FIGS. It is rotatably maintained in a state of protruding from the guide block 20 by a predetermined amount.

A pair of support portions 23 extending toward the bottom surface is formed at one end of the base portion 21 , and a spherical guide roller 24 is supported between the pair of support portions 23 via a shaft member 25 .
The entire surface of the pair of guide rollers 24 is spherical, but the portion facing the support portion 23 is flat. As shown in FIGS. 2 and 4, the guide roller 24 contacts the surface 8 (one of the members to be joined) of the joint 6 at a point 28 of the spherical portion, and the end surface 7 (a member to be joined) of the cylindrical body 5 at a point 27. the other side of the member).

A contact block 31 is arranged on the bottom side of the other end of the base portion 21 , that is, on the side opposite to the guide roller 24 across the guide hole 22 . The contact block 31 is fixed with a bolt 32 passing through the base 21 .
The abutment block 31 is not limited to being fixed to the base portion 21 with the bolts 32 , and may be fixed by other fixing means, or may be formed integrally with the base portion 21 .

As shown in FIGS. 2, 3 and 5, the contact block 31 is formed with a first contact surface 33 and a second contact surface 34 as a pair of contact surfaces on the side opposite to the bolt 32. there is
The first contact surface 33 is formed by notching one of the lower side edges of the contact block 31 in FIG. there is The cylindrical surface of the first contact surface 33 has a curvature that enables close contact with the surface 8 of the joint 6 .
The second contact surface 34 is formed by notching the other side edge of the contact block 31 on the lower side in the figure into a plane at an angle of 45 degrees with respect to the lower side in the figure. The second contact surface 34 forms an angle of 90 degrees with the first contact surface 33 , and is in close contact with the end surface 7 of the cylindrical body 5 while the first contact surface 33 is in close contact with the surface 8 of the joint 6 . It is possible.

If the joint 6 is cylindrical, the generatrix of its surface 8 is parallel to the central axis of the joint 6 . The end face 7 of the cylinder 5 is normally a plane perpendicular to the central axis of the cylinder 5 . The angle between the surface 8 of the joint 6 and the end face 7 of the cylinder 5 is usually 90 degrees. Therefore, the angle formed by the second contact surface 34 and the first contact surface 33 is also 90 degrees. By setting the angle in this manner, the first contact surface 33 can be brought into close contact with the end surface 7 of the tubular body 5 while being in close contact with the surface 8 of the joint 6 .
The angles formed between the contact block 31 and the first contact surface 33 and the second contact surface 34 are 45 so that the angles formed with respect to the surface 8 of the joint 6 and the end surface 7 of the tubular body 5 are equal. A total of 90 degrees is set for each degree. For example, these may be distributed between 40 degrees and 50 degrees, considering the angle of the central axis 22C of the guide hole 22, which will be described later, that is, the angle of the stirring pin 11 with respect to the surface 8 of the joint 6 and the end surface 7 of the cylindrical body 5. can be changed.

If the angle formed by the surface 8 of the joint 6 and the end surface 7 of the cylindrical body 5 is not 90 degrees, the angle formed by the second contact surface 34 and the first contact surface 33 can be changed according to the angle. can. In such a case, the angles formed by the contact block 31 and the first contact surface 33 and the second contact surface 34 can also be changed as appropriate. For example, when the angle formed with the surface 8 of the joint 6 and the end surface 7 of the cylindrical body 5 is 80 degrees, the total angle may be 80 degrees by 40 degrees each.

As shown in FIGS. 3 and 5, the boundary line of the intersection between the first contact surface 33 and the second contact surface 34 extends from the central axis 22C of the guide hole 22 and the center of the guide roller 24. arranged to pass. The central axis 22C of the guide hole 22 forms an angle of 45 degrees with respect to the first contact surface 33 and the second contact surface 34, respectively.

In this embodiment, friction stir welding is performed in the following procedure.
First, the stirring pin 11 is inserted into the guide hole 22 to form the inner corner welding rotary tool 10 , which is attached to the spindle 2 , and the machine tool 1 is operated to move the stirring pin 11 and the guide block 20 to the inner corner of the workpiece 3 . It is brought close to the part 4 , that is, the joint portion sandwiched between the end surface 7 of the cylindrical body 5 and the surface 8 of the joint 6 .
Next, while rotating the main shaft 2 to rotate the stirring pin 11, the guide roller 24 and the contact block 31 of the guide block 20 are brought into contact with the surface 8 and the end surface 7, respectively, and the stirring pin held in the guide hole 22 is rotated. Friction stir welding between the cylindrical body 5 and the joint 6 is started by pressing the joint 11 against the joint portion between the surface 8 and the end face 7 .
Subsequently, while the cylindrical body 5 and the joint 6 are friction-stirred by the stirring pin 11, the stirring pin 11 is moved along the seam between the surface 8 and the end face 7, so that the seam between the surface 8 and the end face 7 is sequentially moved. Friction stir welding is performed.
At this time, the guide roller 24 and the contact block 31 roll on the surface 8 and the end face 7 on both sides of the agitating pin 11, thereby stabilizing the direction of the guide block 20 or the agitating pin 11, pressing the member to be welded and lifting it up. and vibration.
On the other hand, in the abutment block 31, the first abutment surface 33 and the second abutment surface 34 move in close contact with the surface 8 and the end surface 7, respectively, so that the agitation pin 11 held in the guide hole 22 is moved. is always maintained at a constant depth and angle with respect to the seam of the surface 8 and the end face 7, and also suppresses the members to be joined (the surface 8 of the joint 6 and the end face 7 of the cylindrical body 5) to suppress lifting and vibration. .
Thus, in this embodiment, the guide roller 24 on one end side of the guide block 20 reliably presses the surface 8 and the end surface 7 even if the angle of the stirring pin 11 with respect to the surface 8 and the end surface 7 varies slightly. In addition, the abutment block 31 on the other end side of the guide block 20 allows the stir pin 11 to always maintain a constant depth and angle with respect to the joint between the surface 8 and the end surface 7, thereby performing stable friction stir welding. It can be carried out.

According to this embodiment, the following effects can be obtained.
In this embodiment, a pair of guide rollers 24 on both sides of the guide hole 22 through which the agitating pin 11 is inserted is rolled on each surface (end surface 7 and surface 8) of the pair of members to be welded (cylindrical body 5 and joint 6). By moving the member to be welded, the members to be welded are pressed to suppress the floating and vibration, and the rotating stir pin 11 can friction stir weld the intersection of the pair of members to be welded.

At this time, the guide roller 24 and the contact block 31 contact the pair of engaged members at two locations on the opposite sides of the guide hole 22 .
Of these, the contact of the guide rollers 24 (two points 27 and two points 28 shown in FIG. 2) can be maintained whether the surfaces of the pair of members to be joined are flat or curved. Therefore, even when the inner corner portion 4 is composed of the flat end surface 7 of the cylindrical body 5 and the cylindrical surface 8 of the joint 6, it is possible to suppress lifting and vibration by pressing the members to be joined.

On the other hand, in the abutment block 31, the first abutment surface 33 and the second abutment surface 34 move in close contact with the surface 8 and the end surface 7, respectively, so that the agitation pin 11 held in the guide hole 22 is moved. is always maintained at a constant depth and angle with respect to the seam between the surface 8 and the end surface 7, and also suppresses the members to be joined (the surface 8 of the joint 6 and the end surface 7 of the cylindrical body 5) to suppress lifting and vibration. , stable friction stir welding is performed.
That is, in the present embodiment, even if one surface (surface 8) of the pair of members to be joined (joint 6) is a curved surface (cylindrical surface), the first contact surface 33 is in close contact with this curved surface. The contact block 31 presses and stabilizes the members to be joined (the surface 8 of the joint 6 and the end surface 7 of the cylindrical body 5) by the surface contact.

In this embodiment, the first contact surface 33 and the second contact surface 34 intersect each other at 90 degrees (45 degrees + 45 degrees), and the guide hole 22 is located between the first contact surface 33 and the second contact surface 33 . It is arranged to penetrate on the extended line of the boundary line of the intersection with the surface 34 .
For this reason, the agitation pin 11 inserted through the guide hole 22 is positioned along the extension of the boundary line of the intersection between the first contact surface 33 and the second contact surface 34 and the pair of members to be welded (cylindrical body 5). can be held towards the intersection of the end face 7 of the joint 6 and the surface 8) of the joint 6.

As described above, the guide block 20 of this embodiment can be used not only when the surfaces of a pair of members to be joined are flat and curved, but also when both are flat or when both are curved. The guide rollers 24 and contact blocks 31 on both sides can contact each of the pair of members to be joined, and can hold the members to be joined to suppress lifting and vibration.

[Second embodiment]
FIG. 6 shows a second embodiment of the invention.
In the first embodiment described above, the pair of members to be joined to be friction stir welded is the cylindrical body 5 of the workpiece 3 and the joint 6, the end surface 7 of the cylindrical body 5 is flat, and the surface 8 of the joint 6 is cylindrical. there were.
On the other hand, in the present embodiment, as shown in FIG. 6, the workpieces 3A to be joined are cylindrical bodies 5A and 6A having the same diameter, and the edges of each are chamfered at an angle of 45 degrees to form a conical surface. Slanted surfaces 7A and 8A are formed, and the inner corner portion 4A is formed by these inclined surfaces 7A and 8A.

In order to perform friction stir welding on such an inner corner portion 4A, in this embodiment, the same rotary tool 10 for inner corner welding as in the first embodiment described above is used.
As described in the first embodiment (see FIGS. 2 to 5), the guide block 20 of the rotary tool 10 for joining inner corners has a spherical guide roller 24 at one end and a pair of guide rollers 24 at the other end. contact surface (first contact surface 33 and second contact surface 34). However, in this embodiment, both the first contact surface 33 and the second contact surface 34 are formed in a conical surface shape corresponding to the inclined surfaces 7A and 8A.

In this embodiment, the guide rollers 24 at one end contact the inclined surfaces 7A and 8A, respectively, and the contact blocks 31 at the other end correspond to the inclined surfaces 7A and 8A, respectively. Contact can be made on the conical first contact surface 33 and the second contact surface 34, and the surfaces (inclined surfaces 7A and 8A) of the pair of members to be joined (cylindrical bodies 5A and 6A) are both curved surfaces. However, each of them can be reliably held down, and floating and vibration can be suppressed and stabilized.

[Third embodiment]
FIG. 7 shows a third embodiment of the invention.
In the first embodiment described above, a spherical guide roller 24 is provided at one end of the guide block 20, and a pair of members to be joined (the end surface 7 of the cylindrical body 5 and the surface 8 of the joint 6) to be friction stir welded is provided. I was moving
On the other hand, in the guide block 20A of this embodiment, as shown in FIG. 7, the guide roller 24A has a flat spherical shape that is short in the rolling axis direction (the axial direction of the shaft member 25).
In this embodiment, since the guide roller 24A is flat and has a large outermost radius, the inner corner portion where the angle between the pair of members to be joined (the end surface 7 of the cylindrical body 5 and the surface 8 of the joint 6) is small. 4 (see FIG. 1), the guide roller 24A can be introduced to the inside thereof, and the application range of the rotating tool 10 for joining inner corners can be expanded.

[Fourth embodiment]
FIG. 8 shows a fourth embodiment of the invention.
In the first embodiment described above, a spherical guide roller 24 is provided at one end of the guide block 20, and a pair of members to be joined (the end surface 7 of the cylindrical body 5 and the surface 8 of the joint 6) to be friction stir welded is provided. I was moving
On the other hand, in the guide block 20B of the present embodiment, as shown in FIG. 8, the guide rollers 24B are formed in a pair of conical shapes joined to each other at the bottom sides. That is, the guide roller 24B has a conical surface 241 formed on one side in the direction of the rolling axis (the axial direction of the shaft member 25) and a conical surface 242 oppositely directed on the other side. A cylindrical surface 243 is formed.
Here, the conical surface 241 and the conical surface 242 each have a generatrix angle of 45 degrees with respect to the rolling axis, and a mutual generatrix angle of 90 degrees. As described in the first embodiment, the pair of members to be welded (the end surface 7 of the cylinder 5 and the surface 8 of the joint 6) on which the conical surfaces 241 and 242 roll is formed by the included angle between the end surface 7 and the surface 8. is set to 90 degrees, and the angles of the conical surfaces 241 and 242 are set according to the angle between the pair of members to be joined.

In this embodiment, in the guide roller 24B, the angle formed by the generatrices of the pair of conical shapes (conical surfaces 241 and 242) and the angle between the pair of members to be joined (the end face 7 of the cylindrical body 5 and the surface of the joint 6 8), the pair of conical surfaces 241 and 242 correspond to one (the surface 8 of the joint 6) and the other (the end surface 7 of the tubular body 5) of the members to be joined, respectively, as a line rather than a point. By making contact at 27B and 28B, it is possible to stably hold the guide block 20B and hold down the members to be joined to suppress lifting and vibration.
That is, when the pair of guide rollers 24 are spherical as in the first embodiment, the guide block 20 is attached to each of the members to be joined (cylindrical body 5 and joint 6) by a line connecting the centers of the guide rollers 24. There is room to rotate around the minute. On the other hand, if the conical surfaces 241 and 242 of this embodiment are a pair of conical shapes, there is no room for such rotation, and the direction of the guide block 20B with respect to the non-contact member is uniquely determined, and the agitation pin 11 can be properly guided in a more stable state.

[Fifth embodiment]
FIG. 9 shows a fifth embodiment of the invention.
In the first embodiment described above, a spherical guide roller 24 is provided at one end of the guide block 20, and a pair of members to be joined (the end surface 7 of the cylindrical body 5 and the surface 8 of the joint 6) to be friction stir welded is provided. I was moving
On the other hand, in the guide block 20C of this embodiment, as shown in FIG. 9, the guide roller 24C is cylindrical.
In this embodiment, the cylindrical guide roller 24C can roll on the pair of members to be joined (the end face 7 of the cylinder 5 and the surface 8 of the joint 6) at points 27 and 28 on both ends of the guide roller 24C. . Further, since the guide roller is cylindrical, manufacturing becomes extremely easy.
In addition, in the cylindrical guide roller 24C, it is preferable that both end edges that roll on the pair of members to be joined are chamfered into a conical surface or a spherical surface.

[Sixth embodiment]
FIG. 10 shows a fifth embodiment of the invention.
In the first embodiment described above, a spherical guide roller 24 is provided at one end of the guide block 20, and a pair of members to be joined (the end surface 7 of the cylindrical body 5 and the surface 8 of the joint 6) to be friction stir welded is provided. I was moving
On the other hand, in the guide block 20D of the present embodiment, as shown in FIG. 10, a pair of disk-shaped guide rollers 24D are installed in place of the guide rollers 24 of the first embodiment.

Each of the two guide rollers 24D is formed by rounding the peripheral surface of a disk-shaped member, and the cross section of the peripheral portion is arcuate or semicircular. The two guide rollers 24D are inserted through the same shaft member 25 and supported so as to be rotatable around the axial direction.
The thickness of the portion through which the shaft member 25 penetrates is ensured so that the guide roller 24D does not tilt with respect to the shaft member 25 . A collar 25D is inserted through the middle portion of the shaft member 25, and two guide rollers 24D supported by the same shaft member 25 are kept at a constant distance from each other by the collar 25D. A washer (not shown) inserted through the shaft member 25 may be mounted between the two guide rollers 24</b>D and the inner surface of the support portion 23 .

As a result, in the guide block 20D of this embodiment, two guide rollers 24D are arranged in parallel inside the support portions 23 on both sides of the guide hole 22 with an interval corresponding to the collar 25D. Then, they can roll on the pair of members to be joined (the end surface 7 of the cylindrical body 5 and the surface 8 of the joint 6) on the outer periphery of these disk-shaped guide rollers 24D.
In this embodiment, one and the other of the pair of guide rollers 24D supported by the same shaft member 25 are connected to one member to be joined (the end surface 7 of the cylindrical body 5) and the other member to be joined (the joint 6), respectively. abuts individually against the surface 8) of the . Therefore, even if the linear velocities at the respective contacting portions are different depending on the attitudes of the guide block 20D and the pair of members to be joined, the members to be joined on each side and the guide rollers 24D in contact with the respective members are reliably aligned. It rolls smoothly and prevents the occurrence of slippage.
Furthermore, since the guide roller 24D is formed by a pair of disk-shaped members, the manufacturing can be facilitated while reducing the material. In addition, since the two guide rollers 24D are supported by the same shaft member 25 and the gap is maintained by the collar 25D, each component can be simplified, which also facilitates manufacturing.

[Other embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and includes modifications within the scope of achieving the object of the present invention.
Although the base portion 21 and the support portion 23 are integrally formed in the above embodiment, the base portion 21 and the support portion 23 may be formed separately and joined with bolts or the like.
In the above-described embodiment, by increasing the thickness of the base portion 21, the positional accuracy of the stirring pin 11 inserted through the guide hole 22, that is, the deviation and inclination between the central axis of the stirring pin 11 and the central axis 22C of the guide hole 22 is reduced. can.
In the above-described embodiment, the range of curved surfaces in which two points of contact can be maintained between the pair of members to be joined (the end surface 7 of the cylinder 5 and the surface 8 of the joint 6 or the inclined surfaces 7A and 8A of the cylinders 5A and 6A) is It changes according to the interval, size and shape of the guide rollers 24 to 24C. Moreover, it is preferable to adjust the protrusion length of the stirring pin 11 held in the guide hole 22 according to the curvature of the surface of the member to be joined.

In the above-described embodiment, the first contact surface 33 and the second contact surface 34 are each a continuous curved surface (cylindrical surface or conical surface) or a flat surface. The surface of surface 34 is not limited to a continuous surface.
For example, a number of irregularities may be formed on the first contact surface 33 or the second contact surface 34, and the tip of each protrusion may be the same virtual cylindrical surface, a curved surface along a conical surface, or a flat surface. It is only necessary that the contact block 31 presses the surface of the member to be joined and stabilizes the surface of the member to be joined by bringing the tip surfaces of the projections into close contact with the surface of the member to be joined at the same time.

In each of the above-described embodiments, the base portion 21, the support portion 23, or the contact block 31 may be provided therein with a coolant passage for dissipating heat associated with friction stir welding.
In each of the above-described embodiments, the guide hole 22 may have a detachable split structure for bearings or support members that come into contact with the stirring pin 11, and may be replaced as appropriate.

INDUSTRIAL APPLICABILITY The present invention can be used as a guide block for inner corner friction stir welding and a friction stir welding method.

DESCRIPTION OF SYMBOLS 1... Machine tool 2... Spindle 3, 3A... Work 4, 4A... Inner corner part 5, 5A... Cylindrical body which is the other of a pair of members to be joined 6... One of a pair of members to be joined Joint 6A... Cylindrical body which is one of a pair of members to be joined 7... End surface which is the other surface of a pair of members to be joined 7A... Slanted surface of the other of a pair of members to be joined 8... A pair of members to be joined One surface of member 8A... Inclined surface which is one surface of a pair of members to be joined 10... Rotary tool for inner corner joining 11... Stirring pin 20, 20A, 20B, 20C, 20D... Guide block 21 Base portion 22 Guide hole 22C Central axis line 23 Support portion 24, 24A, 24B, 24C, 24D Guide roller 31 Contact block 32 Bolt 33 First contact surface 34 Second contact surface 241 Conical surface 242 Conical surface 243 Cylindrical surface 25 Shaft member 25D Collar 27, 28 Point where the pair of members to be joined and the guide roller contact 27B , 28B . . . lines where the pair of members to be joined and the guide roller abut.

Claims (10)

A guide block that presses a member to be welded to perform friction stir welding on an inner corner formed by a pair of members to be welded,
a guide hole for rotatably holding the stirring pin, a guide roller arranged on the side of the guide hole, and a pair of contact surfaces arranged on opposite sides of the guide hole,
The guide roller is rollable on the surface of each of the pair of members to be joined,
A guide block, wherein one of the pair of contact surfaces can contact one of the pair of members to be joined, and the other can contact the other of the pair of members to be joined. In the guide block according to claim 1,
A guide block, wherein the guide roller is spherical. In the guide block according to claim 2,
The guide block, wherein the guide roller has a flat spherical shape with a short rolling axis direction. In the guide block according to claim 1,
A guide block, wherein the guide rollers are a pair of conical shapes joined to each other at their bottom surfaces. In the guide block according to claim 1,
A guide block, wherein the guide roller is cylindrical. In the guide block according to claim 1,
The guide rollers are a pair of disk-shaped members arranged in parallel, one of the disk-shaped members can contact one of the members to be joined, and the other of the disk-shaped members can contact the other of the members to be joined. A guide block characterized by being connectable. In the guide block according to any one of claims 1 to 6,
The pair of contact surfaces are a first contact surface and a second contact surface that intersect each other at a predetermined intersection angle, and the guide hole is an intersection portion between the first contact surface and the second contact surface. A guide block characterized by being arranged on the boundary line of or its extension line. In the guide block according to claim 7,
The guide block, wherein the first contact surface is a cylindrical surface, and the second contact surface is a flat surface. In the guide block according to claim 7,
A guide block, wherein both the first contact surface and the second contact surface are conical surfaces. When friction stir welding is performed on an inner corner formed by a pair of members to be welded,
A guide block having a guide hole for rotatably holding an agitation pin, a guide roller arranged on the side of the guide hole, and a pair of contact surfaces arranged on the opposite sides of the guide hole. using
While rolling the guide rollers on the surfaces of the pair of members to be joined,
A friction stir welding method, wherein one of the pair of contact surfaces is brought into contact with one of the pair of members to be joined, and the other is brought into contact with the other of the pair of members to be joined.

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