JPH11320128A - Probe for inside corner friction agitation joining and inside corner friction joining method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a probe for an inside corner friction agitation joining and a joining method using the same wherein no fusion welding fault arises such as an unevenness or porosity at a joined part face, and the corner coupling joint can be easily formed at a desired inside corner angle. SOLUTION: The probe for inside corner friction agitation joining comprises; a reversed isosceles triangle pillar shape pressing block 5, the isosceles faces of which touch with the corner coupling joint inside faces 1ai, 1bi at a desired inside corner angle, and which is equipped with an agitation pin penetration hole 5h whose core axis is vertical against an upper face 5us from a point on an apex angle ridgeline 5el; a probe main body 6 which is equipped with a bottom face 6bs whose inner diameter is larger than the inner diameter of the penetration hole 5h; an upper part 7t of the agitation pin which is connected with the probe 6 in the same axis and penetrates the penetration hole 5h; and a tip end part 7b of the agitation pin which protrudes from the apex angle ridgeline of the pressing block 5 in a given length. The friction agitation joining can be carried out with the above probe while pressing the slanting face of the pressing block 5 against the inside corner part of the corner coupling joint from the inside corner side of a pair of the members to be joined, with their outer faces 1ao, 1bo held with a backing member 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner corner friction stir welding probe and an inner corner friction stir welding method using the same. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner corner friction stir welding probe capable of forming a corner joint and an inner corner friction stir welding method using the same. The material to be joined may be a material to which normal friction stir welding can be applied, and an aluminum alloy material is particularly easy to apply.

[0002]

2. Description of the Prior Art In forming a corner joint, that is, a weld joint of the corner, in which two base materials (materials to be joined) are maintained in an L-shape at a substantially right angle, a conventional fusion welding method is used.
As shown in (a) to (c), two base materials (materials to be joined)
An outer corner welding method in which a groove 31 is provided in each of 30a and 30b to perform a fusion welding from the outside to form a weld bead 32, and as shown in FIG. There is a welding method.

Further, Japanese Patent Publication No. 9-508073 discloses a friction stir welding method, and further describes that a two-piece corner joint is formed using the friction stir welding method. That is, as shown in FIG. 24, the end face of the substantially horizontal work piece 30b is brought into contact with the side surface of the upper end of the substantially vertical work piece 30a to form the work surface 33, and the work piece 30a and the above The backing 34 is brought into contact with the inner corner of the material 30b to be joined, has a concave circular lower surface 35b at the lower portion, and has a stirring pin 36 projecting downward from the center of the concave bottom surface by a predetermined height.
While rotating the rotating probe 35 provided with the
6 is pressed into the members to be joined 30a and 30b on the surface to be joined, and the rotary probe 35 is brought into contact with the pair of members to be joined 30a and 30b with a predetermined pressing force indicated by an arrow Fp. An outer corner friction stir welding method is disclosed in which the surfaces to be joined are joined while forming the corner joint by moving the joint along the surface to be joined 33 while pressing downward.

[0004]

When a corner joint is formed by fusion welding as shown in FIG. 23, there are the following problems. (1) Irregularities occur on the surface of the weld bead, and depending on the use of the joining material, particularly in the case of corner welding, it may be necessary to finish the weld bead smoothly by cutting or grinding. (2) Welding defects such as porosity tend to occur. Further, fumes, spatters and the like are frequently generated, which leads to deterioration of the working environment and necessity of a spatter removing operation. Further, in order to prevent the working environment from being deteriorated due to fumes, a local dust collector or the like is required, which increases equipment costs. (3) Deformation due to local heating or residual stress is large, and annealing or deformation correction after welding may be required. (4) In order to weld easily oxidizable metals such as aluminum, titanium, and copper, the welding equipment is complicated, expensive, and an inert gas shield welding method such as MIG welding or TIG welding, which is difficult to weld, or an electron beam in a vacuum. Welding, laser welding, etc. must be applied.

According to the outer friction stir welding method shown in FIG. 24, it is possible to reduce or eliminate the problems of the above-mentioned method by fusion welding, but there are the following problems. . (1) Although a substantially right angled joint can be formed, a stirring pin is provided on the bottom surface of the probe body of the friction stir welding probe, which is perpendicular to the bottom surface and is integrally connected to the rotation axis of the probe body. Since the friction stir welding probe is used, a) as shown in FIGS. 25 (a) and (b), when the inner angle β of the pair of materials 30a and 30b is an obtuse angle exceeding 90 °, A surface 33va or 33vb, which is perpendicular to the outer surface of any one of the joining materials 30a and 30b and passes through the inner bottom line, can be formed, and a portion from the joining surface of the outer surface to the outer corner ridge of the pair of joining materials. Distance w _30a or w _30b
Angle stir welding can be performed if the diameter can be larger than the bottom radius of the probe body of the friction stir welding probe.
However, the required processing shape of the end of the plate material of the bonded (plate) material 30a or 30b is complicated, and strict processing accuracy is required. b) Irregularities appear on the surface of the joint, albeit very slightly, as compared with the conventional fusion welding method. Also, this joint was on the side surface of the material to be joined, and could not be joined at the corner.

The present invention solves the above-mentioned problems of the prior art, has almost no drawbacks of the fusion welding, does not have any joining marks on the outer surface as in the case of the outer corner friction stir welding, and has an arbitrary joint. It is an object to provide an inner corner friction stir welding probe which can easily form a corner joint of a pair of workpieces arranged at an angle by friction stir welding from the inside, and a method of inner corner friction stir welding using the same. .

[0007]

According to the present invention, as a first means, in order to solve the above-mentioned problems, a predetermined angle α / which can be arbitrarily determined with respect to an inner surface of a material to be welded. 2
A pair of materials to be joined pre-processed to have a slope, forming a joint to form a corner joint having a predetermined interior angle α arbitrarily determined by contacting the slopes, The inner corner friction stir welding probe for friction stir welding the surface to be welded from the inner corner of the corner joint is formed into an inverted isosceles triangular prism piece shape in which two sides in contact with the inner corner surface of the corner joint are equal and have an apex angle α. A holding block provided with a stirring pin insertion through-hole having a center axis perpendicular to an upper side surface of the inverted isosceles triangular prism piece from a point on a vertex angle ridge line of the inverted isosceles triangular prism piece; and A probe body having a bottom surface having a diameter larger than the inner diameter of the upper side surface of the stirring pin insertion through-hole; and a bottom surface of the probe body integrally connected coaxially with a rotation axis of the probe body, and For through holes And a stirring pin that is rotatably inserted and protrudes by a predetermined length from the apex ridge line of the holding block.

[0008] In the inner friction stir welding probe of the present invention comprising the above-mentioned first means, as the second means,
A portion of the stirring pin, which is closer to the upper side by a predetermined distance from the apex ridge line of the through-hole for inserting the stirring pin of the holding block, has a surface parallel to the upper side at the portion and the holding block. It has an upper surface with a diameter equal to the width between a pair of intersecting lines intersecting with the isosceles surface, a slope contacting the inner corner surface of the pair of materials to be joined constituting the corner joint, and the diameter of the lower surface is the agitation. In addition to providing an inverted truncated cone that is equal to the outer diameter of the tip of the pin and that is connected to the tip of the stirring pin, the reverse of the stirring pin is provided on the apex ridge line side of the stirring pin insertion through hole of the holding block. You may comprise so that the hollow part in which a truncated-cone part is fitted may be provided.

In the inner friction stir welding probe according to the present invention comprising the above-mentioned first means, as the third means,
The stirring pin has a top surface having a diameter larger than the inner diameter of the stirring pin insertion through-hole at a portion closer to the upper side surface of the holding block by a predetermined distance from the apex ridge line of the holding block, A large-diameter disk portion having a circular lower surface having the same diameter as the diameter of the upper surface is provided at a predetermined position between the upper surface and the apex ridge line, and the apex ridge line of the stirring pin insertion through hole of the holding block is provided. Around the side, a circular hole is provided in contact with the upper surface and a part of the outer peripheral surface of the large-diameter disk portion of the stirring pin, and the large-diameter disk portion is fitted therein, and the large-diameter disk portion of the holding block is further provided. Between the outer peripheral surface of the holding block and one end surface in the longitudinal direction of the holding block, at a height position of the circular lower surface of the large-diameter disk portion, so as to form a lower surface parallel to the upper side surface of the holding block,
You may comprise.

[0010] In the inner friction friction stir welding probe of the present invention comprising the above-mentioned first means, as the fourth means,
The stirring pin has a circular lower surface having a diameter larger than the inner diameter of the stirring pin insertion through hole at a position of the apex ridge line of the holding block, and an outer peripheral surface of the inner corner portion of the pair of members to be joined. A large-diameter disk portion having an upper surface at a height position equal to or higher than the height intersecting with the inner surface of the holding pin is provided, and around the apex ridge line side of the stirring pin insertion through hole of the holding block, the stirring pin You may comprise so that the circular hole which contacts the upper surface of a large-diameter disk part and which this large-diameter disk part is fitted may be provided.

In any one of the above-described inner corner friction stir welding probes of the present invention, as a fifth means, a lubricant reservoir is provided on an upper side surface of the holding block or a lower portion of the probe main body, and To provide a lubricant supply passage for supplying lubricant between the bottom of the probe body and the upper side surface of the holding block from the storage unit,
You may comprise.

In the inner corner friction stir welding method of the present invention, in order to solve the above problems, as a sixth means,
A pair of corner joints of the workpieces arranged such that the inner surfaces thereof are arranged at a predetermined angle α arbitrarily determined, using the inner corner friction stir welding probe described in the first means or the second means. In the inner corner friction stir welding method, the ends of the pair of materials to be welded are pre-processed so as to have a slope that forms an angle α / 2 with respect to the inner surface of the material to be welded. The slopes of the pair of materials to be joined are brought into contact with each other so as to form the angle α, thereby forming a surface to be joined, and a backing member in contact with an outer corner portion surface of the pair of materials to be joined. While maintaining the contact between the surfaces to be joined of the material to be joined, while rotating the probe body and the stirring pin of the inner corner friction stir welding probe,
The tip of the stirring pin is pushed into the material to be joined on the surface to be joined, and the probe body is pressed in the direction of the inside corner formed by the pair of materials to be joined, including the apex ridge line of the holding block. While pressing the slope against the inner corner,
The inner corner friction stir welding probe is moved along a line to be welded.

In the inner corner friction stir welding method of the present invention, as a seventh means, in order to solve the above problems,
An inner corner formed by using the inner corner friction stir welding probe according to the third means, to form a corner joint of a pair of materials to be joined, the inner surfaces of which are arranged so as to form a predetermined angle α arbitrarily determined. In the friction stir welding method, the ends of the pair of workpieces are pre-processed so as to have a slope that forms an angle α / 2 with respect to the inner surface of the workpieces, and the inner surfaces have the angle α. The slopes of the pair of materials to be joined are brought into contact with each other to form a surface to be joined, and a backing member in contact with an outer corner portion surface of the pair of materials to be joined, While maintaining the contact between the surfaces to be joined, the pair of the inner friction stir welding probes is provided such that the lower end of the pressing block of the inner friction stir welding probe is located rearward in the moving direction of the inner friction stir welding probe. Inner corner formed on the inner surface of the joining material , While rotating the probe body and the stirring pin of the inner friction stir welding probe, push the tip of the stirring pin and the lower part of the large-diameter disc into the material to be welded on the surface to be welded. The inner corner friction stir welding probe while pressing the probe body in a direction of an inner corner formed by the pair of materials to be joined, and pressing a slope including the apex ridge line of the holding block against the inner corner. Is moved along the line to be joined.

In the inner corner friction stir welding method of the present invention, in order to solve the above-mentioned problem, as an eighth means,
An inner corner formed by using the inner corner friction stir welding probe according to the fourth means, to form a corner joint of a pair of materials to be joined, the inner surfaces of which are arranged so as to form a predetermined angle α arbitrarily determined. The friction stir welding method is pre-processed so that the ends of the pair of workpieces have a slope that forms an angle α / 2 with the inner surface of the workpiece, and a) the slope of the workpiece. When the slopes of the pair of materials to be joined are brought into contact with each other at the inner surface side end position to form a surface to be joined, a position perpendicular to the surface to be joined is located at an inner corner end of the surface to be joined. The outer peripheral dimension of the longitudinal section is slightly larger than the outer peripheral dimension of the longitudinal section of the large-diameter disk portion of the inner corner friction stir welding probe, so that a groove extending in the direction of the line to be joined is formed. A groove having a right-angled triangular cross section is engraved at the pair of joined material ends. After the slopes at the ends of the pair of materials are brought into contact with each other so that the inner surfaces form the angle α, a surface to be bonded is formed, or b) the inner surfaces form the angle α. The slopes at the ends of the pair of materials to be joined are brought into contact with each other to form a surface to be joined, and a bottom surface perpendicular to the surface to be joined is provided at the inner corner of the surface to be joined. The outer peripheral dimension of the longitudinal section is slightly larger than the outer peripheral dimension of the longitudinal section of the large-diameter disc portion of the inner corner friction stir welding probe, and a groove extending in the direction of the line to be joined is engraved. With the backing member in contact with the outer corner portion surface of the member, while rotating the probe body and the stirring pin of the inner corner friction stir welding probe while maintaining contact between the surfaces to be joined of the pair of materials to be joined, , The tip of the stirring pin ahead of the large-diameter disk The probe surface is pushed into the material to be joined, and the probe body is pressed in the direction of the inside corner formed by the pair of materials to be joined, so that the slope including the apex ridge line of the holding block is formed in the inside corner portion. While pressing the circular lower surface of the large-diameter disk portion of the stirring pin against the bottom surface of the groove formed at the inner corner end of the surface to be joined, the inner friction friction stir welding probe is pressed. It is configured to be moved along a line to be joined.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a probe for inner corner friction stir welding of the present invention according to claim 1 and one embodiment of a method of inner friction stir welding of the present invention according to claim 6 are described. , FIG. 1 to FIG. 3, FIG. 16, FIG. 17, and FIG. FIG. 1 is a perspective view of an inner corner friction stir welding probe according to the present embodiment, and FIG. 2 is a sectional view showing the inner corner friction stir welding probe of FIG. 1 and a friction stir welding method using the probe. FIG. 3 is a sectional view taken along line BB of FIG. 1 showing the inner corner friction stir welding probe of FIG. 1 and a friction stir welding method using the probe, and FIGS. 16 and 17 are the present invention. FIG. 16 is an end view showing a shape and an arrangement in a case where a joint is formed by a pair of materials to be applied by applying the embodiment of FIG. 16, and FIG. 16 shows the case where the thicknesses t _{1 and} t _{2 of the} materials FIG. 17 shows a case where the thicknesses t _{1 and} t _{2 of the} materials to be joined are not equal to each other.
9 (a) shows a friction stir welding method for forming a corner joint with the pair of materials shown in FIG. 16 using the inner corner friction stir welding probe shown in FIGS. FIG. 19 (b) is a cross-sectional view showing the finished state of the joint of the formed corner joint.

In the embodiment of the probe for interior friction stir welding of the present invention according to the first aspect shown in the above figure, the ends of the workpieces 1a, 1b are connected to the inner surfaces 1ai of the workpieces 1a, 1b, respectively. 1bi, a slope 1as at a predetermined angle α / 2,
bs of the pair of workpieces 1a and 1b which have been machined in advance so as to have the bs respectively, so that the slopes 1as and 1bs are brought into contact with each other to form a corner joint 3 having a predetermined angle α which is arbitrarily determined. 2 is formed, the internal angle of friction stir welding probe 4 ₁ to friction stir welding the joining surface 2 from the corner inner of the corner joint 3, the inner corners surface of the corner joint 3 1ai, 1
A stirrer having an inverted isosceles triangular prism piece-like outer shape having two sides in contact with bi and having a center axis perpendicular to the upper side surface 5us of the inverted isosceles triangular prism piece from a point on the vertex ridge line 5el of the inverted isosceles triangular prism piece. Holding block 5 with through holes 5h for pin insertion
And the through-hole 5 for inserting the stirring pin of the holding block 5.
h, a probe main body 6 having a circular bottom surface 6bs having a diameter larger than the inner diameter of the upper side surface portion, and a circular bottom surface 6bs of the probe main body 6 integrally connected coaxially with the rotation axis of the probe main body 6, A stirring pin upper part 7t rotatably inserted into the stirring pin insertion through-hole 5h, and integrally connected to the stirring pin upper part 7t, projecting from the apex ridge line 5el of the holding block 5 by a predetermined length; A stirrer pin 7 comprising a stirrer pin tip portion 7b having a stirrer-like stirrer blade;
It is basically composed of

Next, a first aspect of the present invention will be described.
Inner corner and the action of the friction stir welding probe 4 _1, an embodiment of the inner corner friction stir welding method of the present invention according to claim 6 with inner corner friction stir welding probe 4 ₁ of the present invention according to Will be described below. (1) As shown in FIG. 16, the respective thicknesses t ₁ and t ₂
The ends of the pair of materials 1a and 1b having the same length are arranged such that the inner surfaces 1ai and 1bi of the pair of materials 1a and 1b form a predetermined angle α that can be arbitrarily determined.
Is formed in advance so as to have slopes 1as and 1bs respectively forming an angle α / 2 with the inner surfaces 1ai and 1bi of the materials 1a and 1b. Note that different respective thicknesses t _1, t ₂ as shown in Figure 17, a pair of thick difference Δ _t = _{t 2} -t ₁ the bonding material 1
a, when forming the joint 3 corner using 1b is the same as a slope 1as, upon advance processed to have a 1bs, the end surface of the bonding object 1b with a large thickness t ₂ 1
In bes, it is sufficient to form the inclined surface 1bs a position apart by the inner surface 1bi side thickness delta _t from the edge 1boe outer surface 1bo starting. (2) The inclined surfaces 1as and 1bs of the respective ends of the pair of materials 1a and 1b are brought into contact with each other so that the inner surfaces 1ai and 1bi form the angle α, thereby forming the surface 2 to be joined. Form. (3) Outer corner surface 1 of the pair of materials 1a and 1b
By the backing member 8 in contact with ao and 1bo, the slopes 1as and 1bs of the pair of members 1a and 1b are held so as to keep contact during friction stir welding. (4) while rotating the probe body 6 and the stirring pin 7 of the inner corner friction stir welding probe 4 _1,
The tip of the stirring pin 7 is pushed into the materials 1a and 1b around the surface 2 to be bonded. In the case of this embodiment, at the welding start position, a pilot hole having the same diameter as the stirring pin lower part 7bt is made in the part to be joined, so that the processing of the volume of the stirring pin of the plasticized solidified material is performed. Is unnecessary and no problem occurs. Next, the probe body 6 is pressed in the direction of the inner corner (the direction of arrow Fp) formed by the pair of workpieces 1a and 1b, and the slope 5sa including the apex ridge line 5el of the holding block 5, a pair of members to be joined in the surface 1ai of the inner corners of 5Sb, while pressing the 1bi, the inside corner friction stir welding probe 4 ₁ to be joined line 2tl
(The upper end line of the surface 2 to be joined) in the direction of the arrow (t). As a result, frictional heat is generated between the rotating stirring pin 7 and the workpieces 1a and 1b around the surface 2 to be welded, and the temperature rises. The part 9 is formed. After the stirring pin 7 moves in the direction of the arrow (t), the sensible heat of the plastic flow solid phase portion 9 is taken away by the surroundings, the temperature decreases, and the temperature decreases to a temperature at which plastic flow does not occur. The materials 1a and 1b are joined to form a joint 10 as shown in FIGS. 3 and 19 (b). The circular bottom surface 6bs of the probe main body 6 applies a pressing force Fp applied to the stirring pin 7 and the holding block 5 and the holding block 5b.
Even if the plastic flow solid part 9 flows into the gap between the through hole 5h and the stirring pin upper part 7t, it is prevented from flowing out from between the circular bottom surface 6bs and the upper side surface 5us of the holding block 5. It has the effect of doing.

According to the above-described embodiment of the present invention, there are almost no disadvantages associated with fusion welding, and processing for forming a joint surface at the end of the material to be joined, such as external friction stir welding, is employed. There is no disadvantage that the shape is complicated and high precision is required, the joint is not in the corner, and the uneven joint is on the side of the material to be joined, a pair of arbitrarily determined predetermined angle The corner joint of the workpieces can be easily formed by friction stir welding from the inside.

Next, an embodiment of the inner friction stir welding probe of the present invention according to claim 2 and an embodiment of the inner friction stir welding method of the present invention according to claim 6 will be described. 4 to 6, FIG. 16, FIG. 17, and FIG.
This will be described below. FIG. 4 is a perspective view of the inner friction stir welding probe of the present embodiment, and FIG. 5 is a line CC of FIG. 4 showing the inner friction stir welding probe of FIG. 4 and a friction stir welding method using the same. FIG. 6 is a cross-sectional view taken along line DD of FIG. 4, showing the inner corner friction stir welding probe of FIG. 4 and a friction stir welding method using the probe, and FIGS. 16 and 17 are as described above. It is. FIG. 19A shows a friction stir welding for forming a corner joint with the pair of workpieces shown in FIG. 16, for example, using the inner corner friction stir welding probe shown in FIGS. FIG. 19 (b) is a perspective view showing the method, and FIG. 19 (b) is a cross-sectional view showing the finished state of the junction of the formed corner joint.

One embodiment of the inner friction stir welding probe of the present invention according to claim 2 shown in the above figure is the one shown in FIG.
The inner corner to an embodiment of the friction stir welding probe 4 ₁ of the present invention according to claim 1 shown in to 3, differs in the following respects. That is, a portion of the stirring pin 7 which is closer to the upper side surface 5us of the holding block 5 by a predetermined distance from the apex ridgeline 5el of the holding block 5, and a surface parallel to the upper side surface 5us at the portion. said holding block isosceles surface 5Sa, has a top surface having a width equal to the diameter D ₁₁ between a pair of crossed lines where the 5sb intersect a pair of the joining material 1a which slopes constituting the corner joints, among 1b corners surface 1ai, contact with 1bi, together with the lower surface is provided with a inverted truncated cone portion 11 connected to the front end portion 7b of equal the stirring pin outer diameter d _7b of the distal end portion 7b of the stirring pin, the stirring of the pressing block 5 The inverted truncated cone 11 is in contact with the upper surface 11us of the inverted truncated cone 11 of the stirring pin 7 and a part of the outer peripheral surface 11s around the pin ridge 5el side of the pin insertion through hole 5h. provided inverted truncated cone-shaped hollow portion 5 _11a to be fitted , Is basically configured.

In order to assemble the stirring pin 7 composed of the stirring pin upper part 7t, the inverted truncated cone part 11 and the stirring pin tip part 7b, the following configuration is adopted. In order to make the stirring pin 7 detachable from the holding block 5, the center of the holding block 5 above the inverted truncated cone 11 has an inner diameter of the stirring pin insertion through hole 5h. And the outer diameter of the upper surface 1 of the truncated cone 11
Hollow cylinder 5Ip slightly larger outer diameter D _5Ip than the diameter D ₁₁ of 1us is, the pressing is detachably mounted on the central portion of the block 5, presser is fixed to the block 5. b) Further, in order to enable the hollow cylinder 5ip and the stirring pin 7 to be separated and integrated, the hollow cylinder 5ip is formed as a split mold, or the upper end of the stirring pin upper part 7t is connected to the probe. It is configured to be detachably screwed to the lower end of the main body 6.

The corner inner of the action of the inner corner embodiment of a friction stir welding probe 4 ₂ of the present invention according to claim 2 configured as described above, the present invention according to claim 6 using the same friction this embodiment of the stir welding method according to claim 6, wherein the action of the inner corner friction stir welding probe 4 ₁ of the present invention according to claim 1, with inner corner friction stir welding probe 4 ₁ The operation and effects of the embodiment of the internal angle friction stir welding method of the present invention are substantially the same as those of the embodiment, and the description thereof will be omitted.

However, according to the embodiment of the probe for corner-angle friction stir welding of the present invention according to the first aspect, as shown in FIGS. A slight gap between the outer peripheral surface of the pin 7 and the inner surface of the lower end of the through hole 5h for inserting the stirring pin of the holding block 5,
The pair of materials 1a, 1 not necessarily having a high smoothness
There is a possibility that a small gap generated between the inner surfaces 1ai and 1bi of the b and the isosceles surfaces 5sa and 5sb of the holding block 5 that comes into contact with the inner surfaces 1ai and 1bi may enter the gap. On the other hand, according to the above-described embodiment of the inner angle friction stir welding probe according to the second aspect of the present invention, as shown in FIGS. 5 and 6, the stirrer pin 7 of the inner corner friction stir welding probe is used. Inverted truncated cone 11
While the conical peripheral surface 11s is rotating, the pair of workpieces 1
The pair of workpieces 1a, 1b are pressed by the conical peripheral surface 11s of the inverted truncated cone 11 which is generally made of hard metal to be pressed against the respective inner surfaces 1ai, 1bi of the a, 1b.
b, the inner surfaces 1ai and 1bi of the inner surface 1ai and 1bi are leveled and smoothed, and the degree of close contact with the conical peripheral surface 11s of the truncated cone 11 is increased. ₁₁ is formed larger than the inner diameter of the stirring pin insertion through hole 5h at the upper part of the holding block 5, so that the truncated cone 11 and the pair of materials 1a, 1b
Between the inner surfaces 1ai and 1bi and the upper part of the stirring pin 7
t and the through hole 5 for inserting the stirring pin of the holding block 5
There is almost no possibility of entering the small gap between the inner circumference of h.

Next, another embodiment and operation of the inner friction stir welding probe according to the second aspect of the present invention will be described with reference to FIGS. 7, 5, 8, 16, 17 and 9. FIG. This will be described below. FIG. 7 is a perspective view of a probe for inner friction stir welding of the present embodiment, and FIG. 5 is a view showing a probe for inner friction stir welding of FIG. 7 and a friction stir welding method using the probe. 8 is a cross-sectional view taken along the arrow D'-D 'in FIG. 7, showing the inner corner friction stir welding probe of FIG. 7 and a friction stir welding method using the probe, and FIGS.
7, FIG. 19 is as described above.

Another embodiment of the inner friction stir welding probe according to the present invention according to claim 2 shown in the above-mentioned drawings is the inner corner according to claim 2 shown in FIGS. first and the fourth _second embodiment of the friction stir welding probe, differs in the following respects. That is, claim 2 shown in FIGS.
The inner In corner friction stir welding Embodiment 4 ₂ of one embodiment of the probe, around the apex angle ridgeline 5el side of the stirring pin insertion through hole 5h of the pressing block 5 of the present invention according to the stirring pin 7 Upper surface 11us of the inverted truncated cone 11
The inverted truncated cone portion 11 in contact with a portion of the outer circumferential surface 11cs is provided an inverted frusto-conical cavity 5 _11a to be fitted, it has been basically formed with. On the other hand, in Embodiment 4 ₂ ^′ of the inner corner friction stir welding probe, the stirrer pin is provided around the apex ridge line 5 el side of the stirrer pin insertion through hole 5 h of the holding block 5. 7 has an inner peripheral surface having the same diameter as the upper surface 11us of the inverted truncated conical portion 11 and has an inverted cylindrical container-shaped cavity 5 _{11b in which the} inverted truncated cone portion 11 is fitted. And is basically configured. Therefore, the inner peripheral surface of the inverted cylindrical container-shaped cavity portion _511b , the side surface of the inverted truncated cone portion 11, and the pair of materials 1a
, 1b each inner surface 1as of, between the 1bs, so that the space 5 _11p is formed as shown in FIG.

The function of the embodiment of the inner friction stir welding probe 42 ^{'according to} the _second aspect of the present invention configured as described above, and the inner corner of the sixth aspect of the present invention using the same. embodiment of the friction stir welding method comprising the acts inner corner rubbing of stir welding probe 4 ₂ of the present invention according to claim 2,
Claim with inner corner friction stir welding probe 4 ₂ 6
The operation and effect of the embodiment of the internal angle friction stir welding method of the present invention according to the present invention are substantially the same except for the following points.

That is, due to the presence of the space _511p shown in FIG. 8, even if a pilot hole is not formed around the surface 2 to be joined at the joining start portion as in the case of the above-described embodiment, the above-described space can be obtained. The plastic flowing solid metal of the volume of the stirring pin tip 7b pushed into the joining surface portion flows into the space _511p , and friction stir welding is started smoothly. In addition, the rotating inverted truncated cone portion 1
By the one side surface 11s, the action of stirring the plastic flowing solid metal in the space _511p and the action of generating frictional heat are improved, and the joining is further facilitated.

Next, one embodiment of the inner friction stir welding probe of the present invention according to claim 3 and one embodiment of the inner friction stir welding method of the present invention according to claim 7 will be described. This will be described below with reference to FIGS. 9 to 12, FIG. 16, FIG. 17, and FIG. FIG. 9 is a perspective view of the inner friction stir welding probe of the present embodiment, and FIG.
FIG. 10B is a cross-sectional view taken along the line HH of FIG. 9, and FIG. 11A is a probe for inner friction stir welding of FIG. 9 and friction stir welding using the same. FIG. 9E showing the method
11 (b) is a view of a main part of FIG. 11 (a), and FIG. 12 is a view showing the inner corner friction stir welding probe of FIG. 9 and a friction stir welding method using the same. 9 and FIG. 16 and FIG. 17 are as described above. FIG.
0 (a) shows a friction stir welding method for forming a corner joint using the pair of plate members shown in FIG. 16 using the inner corner friction stir welding probe shown in FIGS. FIG. 20 (b) is a cross-sectional view showing the finished state of the joint of the formed corner joint.

One embodiment of the probe for inner friction stir welding according to the present invention according to claim 3 shown in the above-mentioned figure is the inner friction according to the present invention according to claim 1 shown in FIGS. and an embodiment of the stir welding probe 4 _1, differs in the following respects. That is, the stirring pin 7, to the site where the close the upper side surface 5us of the apex angle ridgeline 5 by a predetermined distance from _el presser block 5 of the pressing block 5, than the inner diameter of the stirring pin insertion through hole 5h It has an upper surface 12us having a large diameter D _12, the the upper surface 12us apex angle ridgeline 5e
given provided with a large-diameter disc portion 12 having a circular lower face 12bs of the same diameter as the diameter D ₁₂ of the upper surface position, the apex angle of the stirring pin insertion through hole 5h of the pressing block 5 between l Around the edge 5el side, the stirring pin 7
Said circular hole 5 ₁₂ provided in contact with a portion of the upper surface 12us and the outer peripheral surface of the large-diameter disc portion 12 of further the pressing block 5
The upper surface 5us of the holding block 5 is located at the height of the circular lower surface 12bs of the large diameter disk portion 12 between the outer peripheral surface 12cs of the large diameter disk portion 12 and the end surface 5es of the holding block 5 in the longitudinal direction. It is formed basically to have a lower surface 5ls parallel to. Above circular bottom 12bs
Is formed in a concave shape, and accommodates the plastic flow solid phase metal overflowing when the lower stirring pin 7b is pushed into the surface to be welded at the start of welding, in addition to the action of stirring and frictional heat generation of the plastic flow solid metal.

The large-diameter disc portion 12 of the stirring pin 7 is used.
May be determined in the following manner.
That is, in FIGS. 11A and 11B, the lower surface 12bs of the large-diameter disk portion 12 is measured from the upper end line 2tl of the surface 2 to be joined.
Until the height h _12b, slope of the outer peripheral surface the pressing block 5 of the from the lower surface 12bs large diameter disc portion 12 5Sa, 5Sb
When of up height position intersecting with each height and h _12c, the lower surface 12bs of the large diameter disc portion 12, the pair of the welded material 1a, 1b of the inner surface 1ai, respectively and the joining surface of 1bi 2 Of the inverted triangle of vertical section between the top line 2tl of
When the cross-sectional area of 0u is defined as Av, the lower surface 12bs, the outer peripheral surface 12cs, and the holding block 5 of the large-diameter disk portion 12 are formed.
So that the sum of the cross-sectional areas Aa, Ab of the longitudinally triangular spaces 12a, 12b on both lower sides of the large-diameter disk portion 12 formed by the slopes 5sa, 5sb is substantially equal to the cross-sectional area Av. The heights h _12b and h _12c are determined. The position of the upper surface 12us of the large-diameter disk portion 12 is such that the outer peripheral surface 12cs of the large-diameter disk portion 12 is
Slope 5Sa, when the height from the respectively intersecting height of 5sb to said upper surface 12us was h _12t, may be determined to the extent that the height is substantially equal to the h _12c.

Next, the inner corner and the action of the friction stir welding probe 4 ₃ of the present invention according to claim 3 configured as described, claim 7 with inner corner friction stir welding probe 4 ₃ An embodiment of the inner corner friction stir welding method according to the present invention will be described below. Items (1) to (3)
And action inner corner of the friction stir welding probe 4 ₁ of the present invention according to claim 1, the inner corner friction stir welding probe 4
_The method is the same as that of (1) to (3) described in the embodiment and the operation of the inner corner friction stir welding method according to claim 6 of the present invention using _{No. 1} ; (4) FIGS. 12 and 20
(A), the moving direction indicated that the reader has an apex angle ridgeline 5el in said corner friction stir welding probe 4 ₃ presser block 5 at the inner corner friction stir welding probe 4 ₃ arrows (t) In front of the lower surface 5ls of the holding block 5
So that the pair of workpieces 1
Place in the inner corners to be formed at a and 1b, while rotating the probe body 6 and the stirring pin 7, wherein the lower outer peripheral portion of the distal end portion 7 _b and the large-diameter disc portion 12 of the stirring pin 7 The probe body 6 is pushed into the materials 1a and 1b around the surface 2 to be bonded, and the probe body 6 is pressed into the pair of materials 1a.
By pressing in the direction of the inner corner formed by a and 1b (in the direction of arrow Fp), the slopes 5sa and 5sb of the holding block 5 including the apex ridgeline 5el are brought into contact with the pair of workpiece surfaces 1ai of the inner corner. , while pressing the 1bi, moving the inside corner friction stir welding probe 4 ₃ in the direction of the arrow along the joined lines 2TL (upper line of the surface to be bonded 2) (t).

As a result, the rotating stirring pin tip 7
b, the lower outer peripheral surface 12cs of the large-diameter disk portion 12, the concave circular lower surface 12bs, and the material 1 to be bonded around the surface 2 to be bonded.
The temperature rises due to the generation of frictional heat between a and 1b, and the stirring pin tip 7b and the lower outer peripheral surface 12 of the large-diameter disc 12
A plastic flow solid phase portion 9 is formed around cs and the concave circular lower surface 12bs. At this time, as described with reference to FIG. 11B, the cross-sectional area Av of the space 10u of the inverted triangular longitudinal section and the space 12a, 12b of the longitudinal cross-sectional triangle on both sides below the large-diameter disk portion 12 are described. Since the heights _h12b and _h12c are determined so that the sum of the respective cross-sectional areas Aa and Ab is substantially equal, the height of the plastic flow solid phase portion displaced by the lower outer peripheral portion of the large-diameter disk portion 12 is reduced. The volume equivalent is the lower surface 5ls of the holding block 5 and the upper end line 2 of the surface 2 to be joined.
The space 10u having an inverted triangular cross section formed between tl and tl is filled. Then, when the stirring pin 7 moves in the direction of the arrow (t), the sensible heat of the plastic flow solid phase portion 9 is taken away by the surroundings, the temperature drops, and the temperature drops to a temperature at which plastic flow does not occur. The pair of materials to be joined 1a and 1b are joined to each other, and the upper end has the large diameter, including the solid phase filled in the space 10u having an inverted triangular cross section as shown in FIGS. 12 and 20 (b). the diameter D ₁₂ of the disk portion, the depth 11
Are formed at the height h _12c described with reference to FIG.

Also, in the embodiment of the inner corner friction stir welding probe according to the third aspect of the present invention, the outer diameter of the upper surface 12us of the large-diameter disk portion 12 is equal to the outer diameter of the upper portion of the holding block 5. Since the inner diameter of the stirring pin insertion through hole 5h is larger than the inner diameter of the stirring pin insertion through hole 5h of the holding block 5, the plastic flowing solid phase 9 is formed between the outer peripheral surface of the stirring pin upper portion 7t and the stirring pin insertion through hole 5h. There is almost no possibility of penetrating the slight gaps between them.

Next, an embodiment of the inner friction stir welding probe of the present invention according to claim 4 and an embodiment of the inner friction stir welding method of the present invention according to claim 8 will be described. This will be described below with reference to FIGS. Figure 13 is an inner corner perspective view of a friction stir welding probe 4 ₄ of this embodiment, FIG. 14 (a) shows a friction stir welding method using the same and a friction stir welding probe corner inner of Figure 13 Figure 13 FIG. 14B is a sectional view taken along line JJ of FIG.
FIG. 1A is an enlarged view of a main part surrounded by a broken-line circle in FIG.
5 is a sectional view taken along the line KK of FIG. 13 showing the inner corner friction stir welding probe of FIG. 13 and a friction stir welding method using the same, and FIG. End view showing the shape and arrangement when forming a joint with joining material,
FIG. 21A shows a friction stir welding method for forming a joint using the pair of materials shown in FIG. 18 using the inner friction stir welding probe shown in FIGS. FIG. 21 (b) is a cross-sectional view showing the finished state of the joint of the formed corner joint.

The inner corner to an embodiment of the friction stir welding probe 4 ₄ of the present invention according to claim 4 shown in the above diagram, of the present invention according to claim 1 shown in FIG. 1 to FIG. 3 corner and one embodiment of a friction stir welding probe 4 _1, differs in the following respects. The holding block 5 of the stirring pin 7
Concave circular bottom surface 1 of having a larger diameter D ₁₃ than the inner diameter of the stirring pin insertion through hole 5h to the position of the apex angle ridgeline 5el
3bs, and the outer peripheral surface 13cs has the pair of members 1 to be joined.
A large-diameter disk 13 having an upper surface 13us is provided at a height higher than the height intersecting the inner surfaces 1ai and 1bi of the inner corners a and 1b, and the stirring pin insertion through hole 5h of the holding block 5 is provided. Around the apex ridge line 5el side, the upper surface 13us of the large-diameter disk portion 13 of the stirring pin 7 and the outer peripheral surface 1
It provided a circular hole 5 ₁₃ in contact with a portion of 3cs, have a basic configuration.

Next, the action of the inner corner friction stir welding probe 4 ₄ of the present invention according to claim 4 configured as described above, according to claim 8 using the inner corner friction stir welding probe 4 ₄ An embodiment of the inner corner friction stir welding method according to the present invention will be described below. (1) As shown in FIG. 16, the pair of materials to be joined 1a,
The end of 1b is inclined 1a at an angle α / 2 with respect to the inner surfaces 1ai and 1bi of the materials 1a and 1b.
Process in advance to have s and 1 bs. (2) Perform one of the following steps. a) Each slope 1as, 1
When the slopes 1as and 1bs of the pair of materials 1a and 1b are brought into contact with the inner surfaces 1ai and 1bi of the bs at the end positions thereof, the slopes 1as , The slope 1a at the position of the inner surface 1ai, 1bi side end of 1bs
s, 1 bs, perpendicular to each, and the width is the large-diameter disc portion 13
Of having a slightly larger bottom 14bs than the outer diameter D _13, perpendicular to the bottom surface 14bs from the end portion of the bottom surface 14bs bonding object 1
Side walls 14s reaching inner surfaces 1ai and 1bi of a and 1b respectively
A groove having a right-angled triangular cross section is formed at the ends of the pair of materials to be joined so as to form a groove 14 having w and extending in the direction of the joined line 2tl (the upper end line of the joined surface 2). Then, the slopes 1as and 1bs at the ends of the pair of (plate) materials 1a and 1b are brought into contact with each other so that the inner surfaces 1ai and 1bi form an angle α to form the surface 2 to be bonded. b) The inner surfaces 1ai and 1a of the workpieces 1a and 1b, respectively.
The pair of members 1a, 1
The slopes 1as and 1bs at the end of b are brought into contact with each other to form the surface 2 to be joined, and at the inner end of the surface 2 to be joined,
Has a slightly larger bottom 14bS than the outer diameter D ₁₃ of the large-diameter disc portion 13 having a width perpendicular to said bonding surface 2 is the stirring pin 7, perpendicular to the bottom surface 14bS from both ends of the bottom surface 14bS, the pair A groove 14 extending in the direction of the line 2tl (the upper end line of the surface 2 to be bonded) is provided with a side surface 14sw reaching the inner surfaces 1ai and 1bi of the materials 1a and 1b. (3) Outer corner surface 1 of the pair of materials 1a and 1b
The backing member 8 in contact with ao and 1bo maintains the contact between the surfaces 2 to be joined of the pair of materials 1a and 1b. (4) while rotating the probe body 6 and the stirring pin 7 of the inner corner friction stir welding probe 4 _4,
The tip 7 of the stirring pin 7 ahead of the large-diameter disc 13
b is pushed into the materials 1a and 1b of the surfaces to be welded, and the probe body 6 is connected to the pair of materials 1a and 1b.
b in the inner corner direction (the direction indicated by the arrow Fp), the slopes 5sa and 5sb including the apex ridge line 5el of the holding block 5 are fitted to the inner corner, and the large size of the stirring pin 7 is a concave circular bottom surface 13bs of diameter disc portion 13 to the bottom surface 14bs of the joining surface 2 of the inner corner side end portion the groove 14 formed at a position, while pressing each of said corner friction stir welding probe 4 ₄ under It is moved along the joining line 2tl (the upper end line of the joined surface 2).

[0037] As a result, among the present invention according to the action the inner corner of the friction stir welding probe 4 ₁ of the present invention according to claim 1, in claim 6 with inner corner friction stir welding probe 4 ₁ Similar to the description of the embodiment of the corner friction stir welding method, the joint 10 as shown in FIGS. 15 and 19 is formed below the bottom surface 14bs of the groove 14.

According to the embodiment of the inner friction stir welding probe of the present invention according to claim 4 and the inner friction stir welding method of the present invention according to claim 8 using the same,
The large diameter disk portion 13 of the stirring pin 7 has a concave circular lower surface 13bs.
Therefore, the plastic flow solid phase 9 does not leak into the groove 14 around the concave circular lower surface 13bs. Further, in this embodiment, the groove 14 is formed in advance in the inner corner, so that the bottom surface 14 of the groove is formed.
When the part below bs is viewed, the normal friction stir welding technique can be used as it is. However, the presence of the above-described holding block 5 enables the guide for holding and moving the probe in the unstable inner corner part. Becomes easier.

Next, an embodiment of the inner friction stir welding probe of the present invention according to claim 5 and its operation will be described below with reference to the drawings. Figure 22 (a-1) is the corner inner of the present invention according to claim 1 Friction stir welding probe 4 ₁
AA in FIG. 1 when the present invention according to claim 5 is applied to
FIG. 22 (a-2) is a sectional view taken along line MM of FIG. 22 (a-1).

In the embodiment of the inner corner friction stir welding probe of the present invention according to claim 5 shown in FIGS. 22 (a-1) and (a-2), the inner corner friction stir welding probe 4 is used. to _one position at a predetermined distance from the lower outer peripheral surface 6los of the probe main body 6 of the upper side surface 5us of the pressing block 5, erected ring on projection 15ol a predetermined height, and the ring on the projection 15ol The lower outer peripheral surface 6los of the probe main body 6 and the upper side surface 5us of the holding block 5
A lubricant storage section 15 is provided. Further, the holding block 5 is provided on the bottom surface 6bs of the probe main body 6.
At a position slightly away from the outer periphery of the stirring pin insertion through-hole 5h.
s, one or a plurality of lubricant supply grooves 15go communicating with the lubricant storage section 15 are formed, and the lubricant supply grooves 15go are moved from the lubricant storage section 15 to the bottom surface 6 of the probe main body 6.
A lubricant supply passage for supplying lubricant is formed between bs and the upper side surface 5us of the holding block 5. The distance from the lower outer peripheral surface 6los of the probe main body 6 to the inner side surface of the ring upper protrusion 15ol and the ring upper protrusion 15ol
The height of the lubricant storage portion 15 may be set to a volume capable of storing the amount of the lubricant consumed when forming the corner joint having at least a predetermined length or more.

In the embodiment of the inner friction stir welding probe according to the fifth aspect of the present invention constructed as described above, if the lubricant is stored in the lubricant storage section 15, the lubricant can be used. The lubricant that has entered the lubricant supply groove 15go from the storage section 15 is applied thinly on the substantially entire surface of the bottom surface 6bs of the probe body 6 and the upper side surface 5us of the pressing block 5 in a range in contact with the lubricant as the probe body 6 rotates. As a result, a thin film is formed, so that the coefficient of friction between the bottom surface 6bs of the probe main body 6 and the upper side surface 5us of the holding block 5 is remarkably reduced, and the rotation of the probe main body 6 is smoothed. The wear of the bottom surface 6bs of 6 and the upper side surface 5us of the holding block 5 is prevented.

Next, another embodiment of the interior friction stir welding probe of the present invention according to claim 5 and its operation will be described below with reference to the drawings. FIG. 22 (b-1) shows the inner friction stir welding probe 4 according to the third aspect of the present invention.
_In the case where the present invention according to claim 5 is applied to FIG.
FIG. 22 (b-2) is a sectional view taken along line E of FIG. 22 (b-2).
3 is a view taken along the line NN of FIG.

In the embodiment of the inner friction stir welding probe of the present invention according to claim 5 shown in FIGS. 22 (b-1) and (b-2), the inner friction stir welding probe 4 is provided. ₃ erected a cylindrical outer wall 15pl of a predetermined height on the outer peripheral edge portion of the upper surface 6lus of the lower large diameter portion 6l of the probe main body 6, the a cylindrical outer wall 15pl upper periphery 6uos of the probe body 6 A lubricant reservoir 15 is provided which is surrounded by the upper surface 6lus of the lower large diameter portion 6l of the probe body 6. Further, the bottom surface 6bs of the probe body 6
In addition, a through hole 5h for inserting the stirring pin of the holding block 5
One or a plurality of lubricant supply grooves 15gc which start at a position slightly outward from the outer circumference of the probe body and stop at a position slightly inward from the lower outer peripheral surface 6los of the probe main body 6 are engraved. One or a plurality of lubricant supply holes 15h communicating with the lubricant supply groove 15gc are formed from the bottom surface of the probe body 15 and the bottom surface 6bs of the probe main body 6 from the lubricant reservoir 15.
A lubricant supply passage for supplying lubricant is formed between the pressing block 5 and the upper side surface 5us.

In the embodiment of the inner friction stir welding probe according to the fifth aspect of the present invention constructed as described above, if the lubricant is stored in the lubricant storage section 15, the lubricant can be used. The lubricant supplied from the storage section 15 to the lubricant supply grooves 15gc communicating with the respective lubricant supply holes 15h via the one or more lubricant supply holes 15h is supplied to the probe as the probe body 6 rotates. Since a thin film is formed by applying a thin film on the substantially entire surface of the bottom surface 6bs of the main body 6 and the upper side surface 5us of the holding block 5 in a range in contact with the bottom surface, the bottom surface 6bs of the probe main body 6 and the upper side surface 5us of the holding block 5 are formed. The friction coefficient between the probe body 6 and the lower surface 6us of the probe main body 6 and the upper side surface 5us of the holding block 5 are prevented from being worn while the rotation of the probe main body 6 is made smoother.

Incidentally, FIG. 22 (a-1), (b-1)
As shown in (1), the holding block 5 is provided with one or a plurality of coolant passages 5ch extending in the longitudinal direction of the holding block 5, and a coolant such as cooling water is circulated through the coolant passages. If the lower part is cooled, the temperature of the tip of the stirring pin is lowered, the width of the plastic flow solid phase formed around the stirring pin is reduced, and the slopes 5sa and 5sb near the apex ridge line 5el of the holding block 5 are reduced. Since the adhesion of the material to be joined, for example, aluminum or the like to the metal is reduced, and the temperature rise of the holding block 5 itself is reduced.
As compared with a case where cooling is not performed, the heat capacity of the holding block 5 can be small, and there is also an effect that the holding block 5 can be downsized.

Further, in any one of the first to fifth aspects,
In the embodiment of the inner friction stir welding probe according to the present invention described in the paragraph, the material of the stirring pin 7 is preferably a material having higher hardness and wear resistance than the material to be joined such as tool steel,
For example, when the material to be joined is an aluminum alloy material, ordinary tool steel is sufficient. The holding block 5 has an upper side surface 5us, an inner surface of the stirring pin insertion through hole 5h, and slopes 5sa and 5sb including the apex ridge line 5el, respectively, a lower surface 6bs of the probe main body 6, an outer circumferential surface of the stirring pin 7 and Since the inner surfaces 1ai and 1bi of the pair of materials 1a and 1b contact and slide with each other, they are easily worn. Therefore, the holding block 5 is desirably formed of a material having high wear resistance or a material having been subjected to a wear-resistant surface treatment. For example, cemented carbide, ceramics, tool steel, ceramics, TiC, etc. It is desirable that the surface is coated.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, but includes other embodiments without departing from the gist of the configuration. Needless to say.

[0048]

According to the inside friction stir welding probe of the present invention and the inside friction stir welding method using the same, the following excellent effects can be obtained. (1) The joining bead surface is flat and beautiful, and it is not necessary to finish it smoothly by cutting or grinding. (2) Welding defects such as porosity are less likely to occur. Further, the generation of fumes, spatters and the like is small, so that the working environment is not degraded and the spatter removing operation is not required. In order to prevent the work environment from deteriorating due to fumes, there is no need for a local dust collector or the like, and equipment costs and work costs are low. (3) Deformation due to residual stress and local heating is small, and there is no need for annealing or deformation correction after welding. (4) Welding of easily oxidizable metals such as aluminum, titanium, and copper is possible, and the welding equipment is complicated and expensive.
It is superior in cost and technical difficulty compared to inert gas shield welding methods such as MIG welding and TIG welding, which are difficult to weld, and electron beam welding in vacuum and laser welding.

Further, compared to the outer corner friction stir welding method, (1) there is no need for a complicated machining shape and strict machining accuracy of the end of the material to be joined of the corner joint. (2) An inner corner angle of a corner joint can be easily formed. (3) The joining line can be formed on the inner corner side, and the joining line is formed not on the side surface but on the corner, so that the appearance is good.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a probe for inner friction stir welding according to the present invention according to claim 1;

2 is a cross-sectional view taken along the line AA of FIG. 1, showing the inner corner friction stir welding probe of FIG. 1 and a friction stir welding method using the same.

FIG. 3 is a sectional view taken along line BB of FIG. 1 showing the inner corner friction stir welding probe of FIG. 1 and a friction stir welding method using the same.

FIG. 4 is a perspective view of an embodiment of the inner friction stir welding probe according to the second aspect of the present invention.

5 shows the inner friction stir welding probe of FIGS. 4 and 7 and a method of friction stir welding using the same in FIG.
Sectional view taken along the line, and a C ^'-C' cross-sectional view taken along line of FIG.

6 is a cross-sectional view taken along line DD of FIG. 4 showing the inner corner friction stir welding probe of FIG. 4 and a friction stir welding method using the same.

FIG. 7 is a perspective view of another embodiment of the inner friction stir welding probe of the present invention according to claim 2;

8 is a D ^'-D' cross-sectional view taken along line of FIG. 7 and the inner corner friction stir welding probe showing a friction stir welding method using the same of FIG.

FIG. 9 is a perspective view of an embodiment of the inner friction stir welding probe according to the third aspect of the present invention.

10A is a sectional view taken along line GG of FIG. 9;
FIG. 10B is a sectional view taken along line HH of FIG. 9.

11 (a) shows the inner corner friction stir welding probe of FIG. 9 and a friction stir welding method using the same, FIG.
FIG. 3B is a cross-sectional view taken along line E, and FIG.

12 is a sectional view taken along the line FF of FIG. 9 showing the inner corner friction stir welding probe of FIG. 9 and a friction stir welding method using the same.

FIG. 13 is a perspective view of an embodiment of an inner corner friction stir welding probe according to the present invention according to claim 4;

14A is a cross-sectional view taken along the line JJ of FIG. 13 showing the inner corner friction stir welding probe of FIG. 13 and a method of friction stir welding using the same, and FIG. It is an enlarged view of the principal part enclosed by the circle of the dotted chain line.

15 is a sectional view taken along the line KK of FIG. 13 showing the inner corner friction stir welding probe of FIG. 13 and a friction stir welding method using the same.

FIG. 16 is an end view showing the shape and arrangement of members to be joined when a joint is formed with a pair of members to be joined by applying the embodiments of claims 1 to 3 and 6 to 7 of the present invention. FIG.

FIG. 17 shows other shapes and arrangements of the materials to be joined when the embodiment of claims 1 to 3 and claims 6 to 7 of the present invention is applied to form a corner joint with a pair of materials to be joined. It is an end elevation shown.

FIG. 18 is an end view showing the shape and arrangement of the members to be joined when a joint is formed by a pair of members to which the embodiments of claims 4 and 8 of the present invention are applied.

FIG. 19 (a) shows an embodiment of an inner corner friction stir welding method according to claim 6 using the inner friction stir welding probe according to any one of claims 1 and 2; FIG. 4B is a perspective view showing an embodiment, and FIG. 6B is a cross-sectional view showing a finished state of a joint portion of the formed corner joint.

FIG. 20 (a) is a perspective view showing an embodiment of an inner corner friction stir welding method according to the present invention according to claim 7, which uses the inner friction stir welding probe according to the present invention according to claim 3;
(B) is a sectional view showing a finished state of a joint portion of the formed corner joint.

FIG. 21 (a) is a perspective view showing an embodiment of an inner corner friction stir welding method according to the present invention according to claim 8, which uses the inner friction stir welding probe according to the present invention according to claim 4;
(B) is a sectional view showing a finished state of a joint portion of the formed corner joint.

FIG. 22 shows two embodiments of the inner corner friction stir welding probe of the present invention according to claim 5, wherein (a-1) is a cross-sectional view taken along line AA of FIG. 1, and (a-2). ) Is a view taken along line MM of (a-1), (b-1) is a sectional view taken along line EE of FIG. 9, and (b-2) is an NN line of (b-1). It is an arrow view.

FIG. 23 is a cross-sectional view showing an example of a conventional corner joint formed by fusion welding.

FIG. 24 is a perspective view showing an example of a conventional corner friction stir welding method.

FIG. 25 shows the processing shapes and arrangements of a pair of materials to be joined when the conventional outer corner friction stir welding method is applied,
(A) and (b) show the case where the inner corner angle β is an obtuse angle, and (c)
FIG. 4 is an end view showing a case where the inner corner degree β is an acute angle.

[Explanation of symbols]

1a, 1b Material to be joined 2 Surface to be joined 3 Corner joint 4 ₁ to 4 ₄ Probe for inner friction stir welding 5 Holding block 5el Vertex angle ridgeline 5us Upper side surface 5ls Lower surface 5h Through hole for stirring pin insertion 5sa, 5sb Holding block slope 5 _11a Inverted truncated conical cavity 5 _11b Inverted cylindrical container cavity 5 ₁₂ , 5 ₁₃ Circular hole 6 Probe body 6l Large diameter part at lower part of probe body 6bs Circular lower surface 7 Stirring pin 7t Stirring pin upper part 7b Stirring pin tip part (lower part) 8 Backing member 9 Plastic flow solid phase part 10 Joining part 11 Inverted truncated cone part 12 Large diameter disk part 12g groove 13 Large diameter disk part 13bs Concave circular lower surface 14 Groove 15 Lubricant storage part 15go Lubricant supply groove 15gc Lubricant supply groove 15h Lubricant supply hole 30a, 30b Base material (material to be joined) 31 Groove 32 Weld bead 33 Surface to be joined 34 Backing 35 Rotating probe 35b Concave circular lower surface 36 Stirring pin

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 24, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

Another embodiment of the inner friction stir welding probe according to the present invention according to claim 2 shown in the above-mentioned drawings is the inner corner according to claim 2 shown in FIGS. first and the fourth _second embodiment of the friction stir welding probe, differs in the following respects. That is, claim 2 shown in FIGS.
The inner In corner friction stir welding Embodiment 4 ₂ of one embodiment of the probe, around the apex angle ridgeline 5el side of the stirring pin insertion through hole 5h of the pressing block 5 of the present invention according to the stirring pin 7 Upper surface 11us of the inverted truncated cone 11
The inverted truncated cone portion 11 in contact with a portion of the outer circumferential surface 11s is provided an inverted frusto-conical cavity 5 _11a to be fitted, it has been basically formed with. On the other hand, in Embodiment 4 ₂ ^′ of the inner corner friction stir welding probe, the stirrer pin is provided around the apex ridge line 5 el side of the stirrer pin insertion through hole 5 h of the holding block 5. 7 has an inner peripheral surface having the same diameter as the upper surface 11us of the inverted truncated conical portion 11 and has an inverted cylindrical container-shaped cavity 5 _{11b in which the} inverted truncated cone portion 11 is fitted. And is basically configured. Therefore, the inner peripheral surface of the inverted cylindrical container-shaped cavity portion _511b , the side surface of the inverted truncated cone portion 11, and the pair of materials 1a
, 1b each inner surface 1as of, between the 1bs, so that the space 5 _11p is formed as shown in FIG. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 24, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

Another embodiment of the inner friction stir welding probe according to the present invention according to claim 2 shown in the above-mentioned drawings is the inner corner according to claim 2 shown in FIGS. first and the fourth _second embodiment of the friction stir welding probe, differs in the following respects. That is, claim 2 shown in FIGS.
The inner In corner friction stir welding Embodiment 4 ₂ of one embodiment of the probe, around the apex angle ridgeline 5el side of the stirring pin insertion through hole 5h of the pressing block 5 of the present invention according to the stirring pin 7 Upper surface 11us of the inverted truncated cone 11
The inverted truncated cone portion 11 in contact with a portion of the outer circumferential surface 11s is provided an inverted frusto-conical cavity 5 _11a to be fitted, it has been basically formed with. On the other hand, in Embodiment 4 ₂ ^′ of the inner corner friction stir welding probe, the stirrer pin is provided around the apex ridge line 5 el side of the stirrer pin insertion through hole 5 h of the holding block 5. 7 has an inner peripheral surface having the same diameter as the upper surface 11us of the inverted truncated conical portion 11 and has an inverted cylindrical container-shaped cavity 5 _{11b in which the} inverted truncated cone portion 11 is fitted. And is basically configured. Therefore, the inner peripheral surface of the inverted cylindrical container-shaped cavity portion _511b , the side surface of the inverted truncated cone portion 11, and the pair of materials 1a
, 1b each inner surface 1as of, between the 1bs, so that the space 5 _11p is formed as shown in FIG.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiromichi Sano Within Nippon Light Metal Co., Ltd. (Tennozu Yusen Building) 2-2-20 Higashi Shinagawa, Shinagawa-ku, Tokyo (72) Inventor Kazuhiro Kuwahara Kambara-cho, Anbara-gun, Shizuoka 1-34-1 Kambara Nippon Light Metal Co., Ltd. Group Technology Center

Claims (8)

[Claims] 1. A pair of materials to be joined which are preliminarily worked so as to have slopes at a predetermined angle α / 2 arbitrarily determined with respect to the inner surface of the material to be joined, with respect to the inner surface of the material to be joined. An inner corner friction stir welding for forming a joint surface so as to form a corner joint having a predetermined inner corner angle α arbitrarily determined by contacting, and friction stir welding the surface to be joined from the inner corner of the corner joint. A probe having an inverted isosceles triangular prism piece shape in which two sides in contact with the inner corner surface of the corner joint are equal and have an apex angle α, and a point on the vertex angle ridge line of the inverted isosceles triangular prism piece, A pressing block having a stirring pin insertion through-hole having a central axis perpendicular to the upper side surface of the equilateral triangular prism piece, and a probe having a bottom surface having a diameter larger than the inner diameter of the upper side surface portion of the stirring pin insertion through-hole of the holding block. A main body and the probe on a bottom surface of the probe main body. A stirring pin that is coaxially connected integrally with the rotation axis of the lobe body, is rotatably inserted into the stirring pin insertion through hole of the holding block, and projects a predetermined length from the apex ridge line of the holding block; A probe for inner corner friction stir welding, comprising: 2. A surface of the stirring pin, which is closer to the upper side by a predetermined distance from the apex ridge line of the through hole for inserting the stirring pin of the holding block, a plane parallel to the upper side at the position. And an upper surface having a diameter equal to a width between a pair of intersecting lines at which the isosceles surface of the holding block intersects, and a slope contacting an inner corner surface of a pair of materials to be joined constituting the corner joint, and a lower surface A diameter of the stirring pin is equal to the outer diameter of the tip of the stirring pin, and an inverted frustoconical portion is provided to be connected to the tip of the stirring pin, and the apex ridge line side of the stirring pin insertion through hole of the holding block, The inner corner friction stir welding probe according to claim 1, further comprising a hollow portion into which the inverted truncated cone portion of the stirring pin is fitted. 3. The stirring pin has a diameter larger than the inner diameter of the through hole for inserting the stirring pin at a position closer to the upper side surface of the holding block by a predetermined distance from the apex ridge line of the holding block. A large-diameter disk portion having an upper surface and having a circular lower surface having the same diameter as the upper surface is provided at a predetermined position between the upper surface and the apex ridgeline, and the stirring pin insertion through hole of the holding block is provided. Around the apex ridge line side, a circular hole is provided in contact with an upper surface and a part of an outer peripheral surface of the large-diameter disk portion of the stirring pin, and the large-diameter disk portion is fitted therein. A lower surface parallel to an upper side surface of the holding block is formed at a height position of the circular lower surface of the large diameter disk portion between an outer peripheral surface of the large diameter disk portion and one end surface in a longitudinal direction of the holding block. Have done Inner corner friction stir welding probe according to claim 1. 4. The stirrer pin has a circular lower surface having a diameter larger than the inner diameter of the stirrer pin insertion through hole at a position of the apex ridge of the holding block, and the outer peripheral surface is formed of the pair of joined members. Along with providing a large-diameter disk portion having an upper surface at a height position equal to or higher than the height intersecting the inner surface of the inner corner portion of the member, around the apex ridge line side of the stirring pin insertion through hole of the holding block, 2. The probe according to claim 1, wherein a circular hole is provided in contact with the upper surface of the large-diameter disk portion of the stirring pin and the large-diameter disk portion is fitted therein. 5. A lubricant storing portion is provided on an upper side surface of the holding block or a lower portion of the probe main body, and a lubricant is supplied from the lubricant storing portion between a bottom surface of the probe main body and an upper side surface of the holding block. The interior angle friction stir welding probe according to any one of claims 1 to 4, further comprising a lubricant supply passage for supplying the lubricant. 6. A friction joint for inner corner friction stir welding according to claim 1 or 2, wherein the corner joint of a pair of materials to be welded is arranged such that the inner surfaces form a predetermined angle α arbitrarily determined. An inner corner friction stir welding method formed by using a probe, wherein end portions of the pair of materials to be welded are pre-processed so as to have a slope that forms an angle α / 2 with respect to an inner surface of the materials to be welded. A backing that contacts the slopes of the pair of materials to be joined so that inner surfaces thereof form the angle α to form a surface to be joined, and a backing that contacts an outer corner surface of the pair of materials to be joined. While maintaining the contact between the surfaces to be joined of the pair of materials to be joined by the member, while rotating the probe main body and the stirring pin of the inner friction stir welding probe, the tip of the stirring pin is covered with the member. Press into the material to be joined at the joint surface Pressing the probe body in the direction of the inner corner formed by the pair of materials to be joined, while pressing the slope including the apex ridge line of the holding block against the inner corner, An inner corner agitation joining method, wherein a joining probe is moved along a line to be joined. 7. A corner joint of a pair of workpieces arranged such that inner surfaces thereof form a predetermined angle α arbitrarily determined by using the inner corner friction stir welding probe according to claim 3. An inner corner friction stir welding method to be formed, wherein the ends of the pair of materials to be welded are pre-processed so as to have a slope that forms an angle α / 2 with respect to the inner surface of the material to be welded. Along with forming the surface to be joined by contacting the slopes of the pair of materials so as to form the angle α, the backing member is in contact with the outer corner portion surface of the pair of materials, While maintaining the contact between the surfaces to be welded of the pair of materials to be welded, the side of the inner friction stir welding probe having the lower surface of the holding block is located rearward in the moving direction of the inner friction stir welding probe. In the pair of materials to be joined, A tip portion of the stirring pin and a lower portion of the large-diameter disk portion are joined to each other while rotating the probe body and the stirring pin of the probe for friction stir welding of the inside corner while being disposed in an inner corner formed by a surface. While pressing the probe body in the direction of the inside corner formed by the pair of materials to be joined, while pressing the slope including the apex ridgeline of the holding block against the inside corner, An inner corner friction stir welding method, wherein the inner corner friction stir welding probe is moved along a line to be welded. 8. A corner joint of a pair of materials to be joined arranged such that inner surfaces thereof form a predetermined angle α arbitrarily determined by using the inner corner friction stir welding probe according to claim 4. An inner corner friction stir welding method to be formed, wherein the ends of the pair of materials to be welded are preliminarily processed so as to have an inclined surface at an angle α / 2 with respect to the inner surface of the materials to be welded. When the slopes of the pair of materials are brought into contact with each other to form a surface to be joined at an inner end portion position of the slope of the material to be joined, at a position of an inner corner end of the surface to be joined. , Having a bottom surface perpendicular to the surface to be welded, and having an outer peripheral dimension in a longitudinal section slightly larger than an outer peripheral dimension in a longitudinal section of the large-diameter disc portion of the inner corner friction stir welding probe, and extending in the direction of the line to be joined. The cross-sectional shape is straight at each end of the pair of materials to be joined so that a groove is formed. After forming a triangular groove, and contacting the slopes at the ends of the pair of materials to be joined so that the inner surfaces form the angle α, a surface to be joined is formed, or b. A) forming a surface to be joined by contacting the slopes of the ends of the pair of materials to be joined such that the inner surfaces form the angle α; and at the position of the inner corner side end of the surface to be joined, A groove having a bottom surface perpendicular to the surface to be welded, an outer dimension of a longitudinal section being slightly larger than an outer dimension of a longitudinal section of the large-diameter disc portion of the inner friction stir welding probe, and extending in the direction of the line to be joined; After engraving, the backing member in contact with the outer corner portion surface of the pair of members to be joined, while maintaining contact between the surfaces to be joined of the pair of members to be joined, While rotating the probe main body and the stirring pin, Of the large-diameter disc portion into the material to be bonded of the surface to be bonded, and pressing the probe body in the direction of the inner corner formed by the pair of materials to be bonded, The slope including the apex ridgeline is formed in the inner corner, and the circular lower surface of the large-diameter disk portion of the stirring pin is formed in the bottom surface of the groove formed at the inner end of the surface to be joined. The inner friction stir welding method is characterized in that the inner friction stir welding probe is moved along a line to be welded while being pressed.