JP2003305576A - Friction stir welding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To execute friction stir welding to an object to be bonded having various plate thickness in common by improving bonding strength, and furthermore, to set a bonding position with high accuracy. <P>SOLUTION: A friction stir welding jig 23 contains a jig body 24 and a shaft part 25 to be inserted to a through-hole 27 coaxial with an axis 26 of the jig body 24. The jig body 24 is operated by a pressurizing means 41 for the jig body and a rotation driving means 42 for the jig body. The shaft part 25 is operated by the pressurizing means 43 for the shaft part and the rotation driving means 44 for the shaft part. The end part 31 of the jig body 24 is pressurized to the object 21 to be bonded in a state that the jig body 24 is stopped, and after that, the rotation driving of the jig body 24 is started. Also, the pressurizing and the rotation driving of the shaft part 25 are executed in a pressurized state of the jig body 24. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction stir welding apparatus for spot welding objects to be welded by friction stir welding.

[0002]

2. Description of the Related Art FIG. 9 shows a friction stir welding apparatus 1 of the prior art.
FIG. The rotor 2 has a right cylindrical columnar pin 5 projecting toward the objects to be welded 3 and 4, and a distal end portion 6 integrally provided with a proximal end portion of the pin 5. The lower end face of FIG. 9 facing 5 forms a shoulder portion 7. In the upper part of FIG. 9, while the rotor 2 is driven to rotate about its axis, the rotor 2 moves straight to the objects to be welded 3 and 4, the lower end surface of the pin 5 contacts the surface of the object to be welded 3, and the rotor 2 moves. Further, it is displaced downward in FIG. 9 and presses the objects to be welded 3 and 4 so that the shoulder portion 7 of the tip portion 6 is pressed to the objects to be welded 3
And the pin 5 and the shoulder portion 7 enter into the articles 3 and 4 to be joined. By the frictional heat between the rotor 2 and the objects to be welded 3, 4, the objects to be welded 3, 4 are partially softened, the softened portions are stirred, and the objects to be welded 3, 4 are welded.

FIG. 10 is an enlarged cross-sectional view of objects 3 and 4 to be joined by friction stir welding using the rotor 2 of the prior art shown in FIG. The objects to be joined 3 and 4 are, for example, aluminum plates. In this prior art, since the pin 5 and the tip portion 6 having the shoulder portion 7 rotate integrally and press the objects to be welded 3 and 4, the object to be welded 3 shown in FIG.
The shoulder portion 7 bites deeply into the welded parts 3 and 4, and as a result, the thickness Δd1 of the bonded portions 11 and 12 of the bonded object 3 in the bonded regions 8 and 9 of the bonded objects 3 and 4 is small. Therefore, there is a problem that the shear strength of the objects to be joined 3, 4 in the left-right direction in FIG. 10 is small. The thickness Δ of the joint portions 11 and 12
If d1 is increased, the amount of the biting of the shoulder portion 7 into the article 3 to be welded becomes small, which causes insufficient stirring of the material in the plate thickness direction (vertical direction in FIG. 10) of the article 3 to be welded. This reduces the bonding strength. Further, in order to set the thickness Δd1 of the joint portions 11 and 12 to an appropriate thickness, it is necessary to prepare the rotor 2 having various sizes and shapes according to the difference in the thickness of the objects to be joined 3 and 4. If so, the work of replacing the rotor 2 is required and the workability is poor, resulting in poor productivity.

When the shoulder portion 7 deeply penetrates into the joined portion 3, a raised portion 13 which can be called a burr is formed on the outer periphery of the tip portion 6, and the material of the raised portion 13 is used for joining. It is not used, and this also reduces the strength and also deteriorates the joining quality.

The rotor 2 is driven to rotate,
Since the objects to be joined 3 and 4 are pressed against each other, the rotor laterally shakes, and there is a problem that the accuracy of the joining position of the pin 5 and the shoulder portion 7 on the objects to be joined 3 and 4 is low.

Further, since the pin 5 rotated at a high speed first comes into contact with the article to be welded, the friction stir operation is performed in a state where the superposed articles 3 and 4 to be welded are not sufficiently adhered to each other, that is, a gap is present. There is a risk that When the friction stir operation is performed on the two objects 3 to be welded with a gap, the joint portion of the object 3 to be welded is reduced, and the shear strength of the objects 3 and 4 to be welded is reduced. .

[0007]

The object of the present invention is to improve the joint strength such as shear strength, and
By providing a friction stir welding apparatus and a friction stir welding jig that can use a common friction stir welding jig regardless of objects having various thicknesses and can improve welding quality. is there.

[0008]

SUMMARY OF THE INVENTION The present invention is a friction stir welding jig, which has an end portion for pressing an object to be welded, and a jig main body having an insertion hole coaxial with an axis line. A friction stir welding jig including a shaft portion that is inserted through a hole and is displaceable in the axial direction and that has an end portion that can project from the end portion of the jig body; and the end portion of the jig body. Jig body pressurizing means for applying pressure to the article to be welded, jig body rotating drive means for rotationally driving the jig body, and shaft section pressurizing means for applying the end of the shaft section to the article to be welded A rotation driving means for the shaft portion for rotating the shaft portion, a pressing means for the jig body, a rotation driving means for the jig body, a pressing means for the shaft portion, and a rotation driving means for the shaft portion. It is a friction stir welding apparatus characterized by including control means for controlling.

Further, according to the present invention, a jig main body having an end portion for pressing an object to be joined and having an insertion hole coaxial with an axis is formed, and the jig main body is inserted through the insertion hole and is displaceable in the axial direction. ,
A friction stir welding jig, comprising: a shaft portion having an end portion that can project from the end portion of the jig body.

According to the present invention, the friction stir welding jig includes a jig main body and a shaft portion that is coaxially inserted through an insertion hole of the jig main body. The main body is actuated by the pressurizing and rotary driving means, and the shaft portion is actuated by the pressurizing and rotary drive means for the shaft portion. Therefore, it is possible to individually control the pressurization and the rotational drive of the jig body and the shaft portion. Therefore, the amount of bite into the material to be welded, which is the base material, can be set individually for the jig body and the shaft, and therefore, the joint strength such as shear strength can be improved and various thicknesses can be achieved. It is possible to use a common friction stir welding jig for objects to be welded, which has good workability, and further suppresses the generation of the raised portion 13 described with reference to FIG. It is possible to improve the material strength and the bonding strength. The jig body and the shaft portion may rotate in the same direction or in opposite directions.

According to the present invention, the control means controls the jig main body rotation drive means to apply the jig main body pressure to the object to be bonded by the jig main body pressurizing means. Rotation is started, and while the jig main body is in the pressure-applied state, the shaft portion rotation means drives the shaft portion to rotate while the shaft portion pressure means applies the end portion of the shaft portion to the object to be bonded. It is characterized by doing.

Further, according to the present invention, the control means rotates the jig body by the jig body rotation driving means while pressing the end portion of the jig body against the object by the jig body pressing means. Then, while the jig main body is in the pressure-applied state, the shaft portion pressure-applying means presses the end portion of the shaft portion against the object to be joined, while the shaft-portion rotary drive means rotationally drives the shaft portion. The rotation speed of the main body rotation drive means is lower than that before the pressure rotation of the shaft portion than after the rotation.

According to the present invention, the jig main body of the friction stir welding jig is operated by the jig main body while the rotation is stopped or when the jig main body is rotationally driven at a low rotation speed. The objects to be joined are pressed and pressurized, and thus the jig body is stopped or is rotated at a low rotation speed while being rotationally driven while pressing the shaft portion. Therefore, the objects to be joined are pressed by the jig body, and the joining position, particularly the joining position during spot joining can be set with high accuracy. Further, in the case of joining two overlapping objects to be joined, by pressing the objects to be joined with a jig body having an area larger than the shaft portion, it is possible to eliminate the gap between the objects to be joined over a wide range. A reliable joining can be performed.

Further, according to the present invention, the control means controls the displacement amount ΔL1 into which the end portion of the jig body presses the article to be joined by the jig body pressing means so as to be a small value. Is characterized by.

According to the present invention, the displacement amount ΔL1 at which the end portion of the jig body enters the object to be welded is independent of the displacement amount ΔL2 at which the end portion of the shaft portion enters the object to be welded. It is possible to improve the joint strength such as shear strength by controlling the displacement amount ΔL1 of the jig body by controlling each of the pressure means for the shaft and the shaft portion. It is possible to suppress the occurrence of the raised portion described above and improve the bonding quality.

Further, the present invention is a friction stir welding jig, which has an end portion for pressing an object to be welded, and a jig main body having an insertion hole extending along an axis, and is inserted into the insertion hole. ,
A friction stir welding jig including a shaft portion that is displaceable in the axial direction and that has an end portion that can project from the end portion of the jig main body, and the end portion of the jig main body is added to an object to be welded. The jig main body pressing means for pressing, the shaft portion pressing means for pressing the end portion of the shaft portion against the object to be joined, the shaft portion rotation driving means for rotating the shaft portion, and the jig body The heating means for heating the object to be joined and pressed, and the control means for individually controlling the jig body pressing means, the shaft portion pressing means, the shaft rotation driving means, and the heating means. It is a friction stir welding apparatus characterized by including.

Further, according to the present invention, there is provided a jig main body having an end portion for pressing an object to be joined and having an insertion hole coaxial with the axis line, and a jig body which is inserted into the insertion hole and is displaceable in the axial direction. ,
A friction stir welding jig, comprising: a shaft portion having an end portion that can project from the end portion of the jig body; and heating means that is built in the jig body and that heats an object to be welded to be pressed. Is.

According to the present invention, the jig body of the friction stir welding jig presses and presses the objects to be welded without rotating. The article heated by this heating means is softened, and the shaft part that penetrates the jig body stirs the softened part,
Joining is done. Therefore, the jig body does not bite into the article to be joined, which can improve the joining strength such as the shear strength of the article to be joined, and the addition of the shaft portion over the range of the softened portion required for joining. The pressure and rotation drive promotes the stirring of the material, which also improves the joining strength, and the friction stir welding jig can be commonly used for the objects to be welded having various plate thicknesses, which improves workability. Is good, and the raised portions described in connection with the above-mentioned prior art do not occur, which also makes it possible to improve the bonding strength and the bonding quality.

The heating means is provided in the jig body, and may be incorporated in the jig body, for example. The heating means may be, for example, an electric heater, or may be an induction heating coil that induction-heats an object to be joined, and the induction heating coil is supplied with AC power from an AC power supply.

Further, according to the present invention, the control means heats the article to be joined by the heating means in a state where the end portion of the jig body is pressed against the article by the jig body pressing means, In the pressurized state of the main body, the shaft portion rotating means drives the shaft portion to rotate while the shaft portion pressing means presses the end portion of the shaft portion against the article.

According to the present invention, the article to be joined is heated at the end of the jig main body to heat the article to be joined by the heating means. To do. As a result, it is possible to achieve a joining state with high joining strength at a highly accurate joining position.

The present invention is also characterized in that it is an apparatus for performing spot joining. Further, the present invention is characterized by being a jig for performing spot joining.

According to the present invention, the spot joining is performed by the above-mentioned device or jig, so that the joining strength of the joining portion can be improved and a good joining quality can be obtained.

[0024]

1 is a sectional view showing a joining operation according to an embodiment of the present invention. A plurality of, for example, two objects 21, 22 to be joined that are vertically stacked are joined by a friction stirrer including a friction stir welding jig 23 according to the present invention. The jig 23 includes a jig body 24 and a jig body 24.
And a shaft portion 25 for inserting the shaft. The jig body 24 has a right cylindrical shape, and an insertion hole 27 is formed coaxially with the axis 26 thereof. The shaft portion 25 has the insertion hole 27 arranged coaxially with the axis line 26. The shaft portion 25 has a right cylindrical shape. Jig body 2
The end face 32 of the end 31 of 4 is perpendicular to the axis 26. The end face 34 of the end 33 of the shaft 25 is also perpendicular to the axis 26. The shaft portion 25 is formed so as to be able to be immersed in and protruded from the jig body 24. The shaft portion 25 may have any shape as long as it can apply pressure and rotational frictional heat to the objects to be welded 21, 22 and has a shape other than a right circular cylinder shape, for example, a conical shape that shrinks toward the tip. Good.

FIG. 2 is a simplified sectional view of a friction stir welding apparatus 35 using the friction stir welding jig 23 shown in FIG. The articles 21, 22 are mounted and fixed on the surface plate 36. In the apparatus main body 37 fixedly provided in this state, the end portion 31 of the jig main body 24 is connected to the objects to be joined 21, 21.
Jig body pressurizing means 41 for applying pressure to 2, and jig body 24
The jig main body rotation drive means 42 for rotating the shaft 25 around the axis 26, and the end portion 33 of the shaft portion 25 for the article to be bonded 21,
A shaft portion pressurizing means 43 for pressurizing the shaft portion 22 and a shaft portion rotational driving means 44 for rotationally driving the shaft portion 25 around its axis 26.
Including and Each of these means 41 to 44 is configured to include, for example, a servo motor. The detection means 46 is the jig 2
The joining state of the objects to be joined 21 and 22 by 3 is detected. The detection means 26 may be realized by, for example, an optical sensor or a television camera. The friction stir welding apparatus 35 shown in FIG. 2 is merely an example of the present invention, and the friction stir welding apparatus may be attached to the wrist of a multi-joint robot, for example, a 6-axis multi-joint robot.

FIG. 3 is a block diagram showing the electrical construction of the friction stir welding apparatus 35 shown in FIG. The processing circuit 47 realized by a microcomputer or the like responds to the output of the detecting means 46 and controls the operation of each of the aforementioned means 41 to 44. The detection unit 46 may have a configuration that detects the load current of the motors included in each of the units 41 to 44 to detect the joining state.

FIG. 4 is a timing chart for explaining the operation of the friction stir welding apparatus 35 shown in FIGS. 1 (1) to 1 (5), and FIG. 5 is a processing circuit 47 shown in FIG.
5 is a flowchart for explaining the operation of FIG. The processing circuit 47 sequentially achieves the operation modes shown in Table 1 of the friction stir welding apparatus 35.

[0028]

[Table 1]

The jig body 24 of the friction stir welding jig 23 is
As shown in FIG. 4A, the jig main body pressurizing means 41 moves down and ascends, and the jig main body rotation driving means 42 rotationally drives as shown in FIG. 4C. The jig body 24 is pressed by the pressing means 41.
The pressurizing force acting on is shown in FIG.

The shaft portion 25 is lowered and raised by the shaft portion pressing means 43 as shown in FIG. 4 (B),
It is rotationally driven by the shaft rotational drive means 44 as shown in FIG. The pressing force acting on the shaft portion 25 is shown in FIG.

In step a1 of FIG. 5, the processing circuit 47 is in a state in which the friction stir jig 23 has shifted to the first operation mode, and as shown in FIG. 44 is stopped. When the friction stir welding command is given from the outside, the processing circuit 47 arranges the friction stir jig 23 above the welding position, and proceeds to step a2.

At step a2, after the time t1, the processing circuit section 47 shifts the friction stirring jig 23 to the second operation mode, and the jig body pressing means 41 causes the jig body 24 to move.
To lower. Next, when the time t1 is reached from the time t1, the friction stir jig 23 is shifted to the third operation mode, and the shaft pressing means 43 lowers the shaft 25.

The processing circuit section 47 starts from time t2 to time t3.
When it reaches, the friction stir jig is shifted to the fourth operation mode, and the shaft portion 25 is rotationally driven by the shaft portion rotation driving means 44. When it is detected that the jig body 24 and the shaft portion 25 have descended and the end surface 32 of the jig body 24 has come into contact with the article 21, the process proceeds to step a3.

At step a3, as shown in FIG. 1B, the end surface 32 of the jig body 24 contacts the article 21 to be joined. When the time t3 is reached from the time t3, the processing circuit unit 4
7 shifts the friction stirring jig 23 to the fifth operation mode,
The jig main body 24 is pre-pressurized by the pre-pressurizing force P1 to the article 21 by the jig main body pressing means 41. By performing the pre-pressurization, the gap between the objects to be joined 21 and 22 is eliminated, and the objects to be joined 21 and 22 come into close contact with each other. To be joined 21,
When 22 is in close contact, the process proceeds to step a4.

At step a4, time t4 to time t5
When it reaches, the shaft portion 25 comes into contact with the article to be joined 21, and the processing circuit portion 27 shifts the friction stir jig 23 to the sixth operation mode. In the sixth operation mode, the shaft portion pressurizing means 43 rotationally presses the shaft portion 25 against the article 21 with the pressing force P2. As a result, as shown in FIG. 1C, friction heat is generated between the shaft portion 25 and the article 21 to be bonded, and the shaft portion 25
The to-be-joined object 21 is softened, and the shaft portion 25 becomes
Bite into.

When the time reaches from time t5 to time t6, the processing circuit unit 27 shifts the friction stirring jig 23 to the seventh operation mode. In the seventh operation mode, the jig body pressing means 41
Thus, the jig body 24 is pressed with a pressing force 3 larger than the preliminary pressing force P1. As a result, as shown in FIG. 1 (4), friction heat is generated between the jig body 24 and the article 21 to be joined, the article 21 near the jig body 24 is softened, and the jig body 24 is joined. Bites into the object to be bonded 21, 22
Is partially in a friction stir state.

At this time, the jig body 24 and the jig 25 are
The objects 21 and 22 are pressed by the pressurizing means 41 and 43, which are rotationally driven by the rotary driving means 42 and 43. The jig main body 24 and the shaft portion 25 are set to a rotational speed and a pressing force at which friction stir welding is optimally performed.

The shaft portion 25 is set to a pressurizing force and a rotation speed sufficient to stir the softened portions of the objects to be welded 21, 22 and the jig body 24 softens the objects to be welded as well as the softened portions. Agitation is set to a small pressing force and rotation speed.

For example, as compared with the rotation speed V1 of the jig body rotation drive means 42 of the jig body 24, the rotation speed V2 of the shaft portion rotation drive means 44 of the shaft portion 25 is set to a higher value. That is, V1 <V2 is set. Further, the jig main body 24 and the shaft portion 25 are pressed by the respective pressurizing means 41 and 43, and the shaft portion of the shaft portion 25 is larger than the pressing force P3 by the jig main body pressing means 41 of the jig main body 24. Pressurizing means 4
The pressing force P2 due to 3 is set to a large value. That is, P3 <P2 is set.

When a predetermined friction stirring time W has elapsed in the friction stirring state, the process proceeds to step a5.

At step a5, when the friction stir time W has elapsed and the time t6 is reached from the time t6, the two objects 2 to be welded 2 are joined together.
The first and second parts 22 and 22 are softened and agitated to form a joint part, and the processing circuit part 27 shifts the friction agitator jig 23 to the eighth operation mode. In the eighth operation mode, the jig bodies 24 and the shaft portion 25 are raised by the pressurizing means 41 and 43 while keeping the rotation state.

When the time t7 is reached from the time t7, the processing circuit section 27 shifts the friction stirring jig 23 to the ninth operation mode. In the ninth operation mode, the rotation of the jig body 24 is stopped by the jig body rotation drive means 42.

When the time reaches from time t8 to time t9, the processing circuit unit 27 shifts the friction stirring jig 23 to the tenth operation mode. In the tenth operation mode, each rolling drive means 42,
The rotation of the jig body 25 and the shaft portion 25 is stopped by 44, and the process proceeds to step a6. At step a6, as shown in FIG.
As shown in (5), the friction stir jig 23 is arranged at a position above the welding position of the objects to be welded, and the series of operations is completed.

The friction stir jig performs friction stir operation in a state in which the gap between the objects to be joined 21 and 22 is eliminated by prepressing the objects to be joined by the jig body 24 in step a3. As a result, good friction stir welding can be performed without causing welding defects. Also, the jig body 24
Since the rotational speed and the pressing force of the shaft portion 25 and the shaft portion 25 can be individually controlled,
1 and 22 are set to a rotation speed and a pressing force suitable for softening, and the shaft portion 25 is set to a rotation speed and a pressing force suitable for stirring the softened portions of the objects to be joined 21 and 22. You can As a result, the region of the joint portion can be formed in a wide range, and the joint strength can be improved. The jig body 24 and the shaft portion 25 may rotate in the same direction or in opposite directions, and the rotation directions may be reversed during the joining. The rotation directions of the jig body 24 and the shaft portion 25 can be individually set to the rotation directions in which the friction stir welding is favorably performed.

Further, for example, the displacement amount ΔL1 that the end portion of the jig body 24 presses into the objects to be joined 21 and 22 and enters,
The jig main body 24 and the shaft portion 25 are arranged such that the end portion 55 of the shaft portion 25 is pressed by the shaft portion pressurizing means 43 and the displacement amount is less than the displacement amount ΔL2 into which the end portion 55 presses the object to be joined, that is, ΔL1 <ΔL2. By adjusting the rotational speed and the pressing force of the jig body 24, the amount of the jig body 24 entering the article to be joined 21 can be reduced, and the joining strength such as shear strength can be improved. It is possible to suppress the occurrence of the raised portion described above and improve the bonding quality. For example, the amount of displacement ΔL1 of the jig body 24 is set to 10% or less of the thickness of the article 21 to be contacted with the jig body 24 first. Since the fatigue strength of the welded object decreases as the displacement amount ΔL1 increases, the displacement amount ΔL1 is appropriately set to the minimum required displacement amount according to the required strength of the welded object.

FIG. 6 is an enlarged cross-sectional view of the objects to be welded 21 and 22 that have been friction stir welded in a state in which the gaps between the objects to be welded 21 and 22 have been eliminated. The objects to be joined 21, 22 are joined over a relatively wide joining region 48, 49, and the thickness Δd2 of the joining portions 51, 52 is sufficiently thick, and the raised portion 53 is very small. Even in the friction stir welding according to the present invention, the welding can be performed in a state where the gap between the objects to be welded 21 and 22 is eliminated. Therefore, the same joining state as in FIG. 6 can be obtained, and the objects to be joined 21, 22 can be joined over a wide joining region 48, 49 to sufficiently increase the friction stir welding strength.

In the above-described embodiment, the jig body 24 is in a stopped state without rotating in the fourth to sixth operation modes, but in the fourth to sixth operation modes as another embodiment of the present invention. , The jig body 24 is the jig body rotation driving means 4
It may remain driven to rotate at a low speed V3 by 2. This low rotation speed V3 is less than the above-mentioned speed V1 after the time t2 of the pressure rotation of the shaft portion 25 (V3.
<V1). Also in such an embodiment, the jig main body 24 has the object 21 to be welded at the low rotation speed V3 described above.
Since it comes into contact with 22 and pressurizes it, it is possible to perform joining at a precise position with high accuracy.

FIG. 7 is a partial sectional view of another embodiment of the present invention. This embodiment is similar to the above-mentioned embodiment, and the corresponding portions bear the same reference numerals. It should be noted that in this embodiment, the heating means 55 is built in the lower portion 31 of the jig body 24 of the friction stir welding jig 23.
The heating means 55 may be, for example, an electric heater,
Alternatively, it may be an induction heating coil supplied with power from an AC power source. In the embodiment shown in FIG. 7,
The jig main body pressurizing means 41 for moving the jig main body 24 up and down to apply pressure is provided, but the jig main body rotation driving means 40 is not provided and the jig main body 24 does not rotate. Shaft 2
5 is moved up and down and pressed by the shaft pressing means 43,
Further, it is rotationally driven by the shaft rotational drive means 44.
The heating means 55 heats the objects to be joined 21, 22 to a temperature at which they can be softened, and agitates the softened portion by pressurizing and rotating the shaft portion 25.

In the embodiment shown in FIG. 7, since the jig body 24 is not rotated and remains stopped as described above, the end surface 32 of the end portion 31 does not bite into the article 21 to be joined. , Do not enter the objects to be joined 21, 22. Therefore, as described in connection with the above-mentioned prior art, the thickness of the object to be bonded 21 in the bonding region does not decrease, and the bonding strength such as shear strength is high.

FIG. 8 shows a friction stir welding apparatus 35 of the present invention.
6 is a simplified side view showing a state in which the robot 57 is attached to a wrist 58. FIG. The robot 57 has a plurality of axes, can read the teaching contents taught in advance from the memory, perform a reproducing operation, and perform spot joining automatically,
Furthermore, the friction stir welding device 35 can be moved along a predetermined welding line to perform the welding operation. Further, in the above description, the jig main body 24 and the shaft portion 25 are said to be raised and lowered, but they may be displaced in the pressing direction,
Two objects to be joined which are lined up in the horizontal direction may be joined, or they may be joined in other directions.

[0051]

As described above, according to the present invention, the jig body and the shaft portion are separately operated for pressurization and rotational drive, thereby making it possible to reduce the amount of bite into the article to be joined which is the base material. The jig main body and the shaft can be individually set, so that the joining strength such as shear strength can be improved, and a friction stir welding jig common to the objects to be joined having various thicknesses can be provided. Can be used, has good workability,
Further, it is possible to suppress the generation of the raised portion 13 described with reference to FIG. 10 described above, and to improve the material amount and the bonding strength of the raised portion.

Further, according to the present invention, the jig body of the friction stir welding jig is in a state where the rotation is stopped or the jig body is rotationally driven at a low rotation speed. Since the objects to be joined are pressed by, the joining position of spot joining can be set with high accuracy. Further, the gap between the objects to be joined can be eliminated, and reliable joining can be performed.

Further, according to the present invention, when the object to be welded is softened by the frictional heat generated by the rotation of the jig body, the displacement amount ΔL1 at which the end of the jig body enters the object to be welded is reduced. It is possible to improve the bonding strength such as the shear strength of the objects to be bonded, suppress the generation of the raised portion, and improve the bonding quality.

Further, according to the present invention, when the article to be welded is softened by the heating means without rotating the jig body, the jig body does not bite into the article to be welded. The joint strength, such as the shear strength, can be improved, and the agitation of the material is promoted by pressurizing and rotating the shaft over the range of the softened part required for the joint, which also improves the joint strength. Further, the friction stir welding jig can be commonly used for objects to be welded having various plate thicknesses.

Further, according to the present invention, by performing spot joining, the joining strength of the joining portion can be improved and good joining quality can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a joining operation according to an embodiment of the present invention.

2 is a simplified sectional view of a friction stir welding apparatus 35 using the friction stir welding jig 23 shown in FIG.

3 is a block diagram showing an electrical configuration of a friction stir welding apparatus 35 shown in FIG.

FIG. 4 is a timing chart for explaining the operation of the friction stir welding apparatus 35 shown in FIGS. 1 (1) to 1 (5).

5 is a flowchart for explaining the operation of a processing circuit 47 shown in FIG.

FIG. 6 is an enlarged cross-sectional view of the objects to be welded 21 and 22 that have been friction stir welded in a state in which the gaps between the objects to be welded 21 and 22 have been eliminated.

FIG. 7 is a partial cross-sectional view of another embodiment of the present invention.

FIG. 8 shows a robot 5 in which the friction stir welding apparatus 35 of the present invention is used.
7 is a simplified side view showing a state in which it is attached to the wrist 58 of FIG.

FIG. 9 is a partial cross-sectional view of a friction stir welding apparatus 1 of the prior art.

10 is an enlarged cross-sectional view of objects 3 and 4 to be joined by friction stir welding using the rotor 2 of the prior art shown in FIG.

[Explanation of symbols]

21,22 Objects to be bonded 23 Friction stir welding jig 24 Jig body 25 Shaft 26 axis 27 insertion hole 31,33 Edge 32,34 end face 35 Friction stir welding equipment 41 Pressing means for jig body 42 Jig body rotation drive means 43 Pressure means for shaft 44 Shaft rotation drive means 55 Heating means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kawa saki Takumi             1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries             Akashi Factory Co., Ltd. (72) Inventor Koji Kadota             1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries             Akashi Factory Co., Ltd. F-term (reference) 4E067 BG02 BG03 CA02 CA04 CA05                       EC03

Claims (10)

[Claims] 1. A friction stir welding jig, comprising a jig body having an end portion for pressing an object to be welded and having an insertion hole coaxial with the axis line, and an axial direction of the jig body. And a jig for pressing the end of the jig body against the object to be joined, the friction stir welding jig including a shaft portion having an end projectable from the end of the jig body. Pressurizing means for main body, rotary driving means for jig main body that rotationally drives the jig main body, pressurizing means for shaft part that presses the end portion of the shaft part against the object to be joined, and rotationally drives the shaft part A rotation driving means for the shaft portion, a pressing means for the jig body, a rotation driving means for the jig body, a control means for individually controlling the pressing means for the shaft portion and the rotation driving means for the shaft portion A friction stir welding device characterized by. 2. The control means drives the jig body to rotate by the jig body rotation driving means while the jig body pressing means presses the end of the jig body against the article. In the pressing state of the jig main body, while rotating the shaft portion by the shaft portion rotation driving means while pressing the end portion of the shaft portion to the object by the shaft portion pressing means, The friction stir welding apparatus according to claim 1, which is characterized in that. 3. The control means rotatably drives the jig main body by the jig main body rotation driving means while pressing the end of the jig main body against the article by the jig main body pressurizing means. While the tool body is in the pressed state, the shaft section pressurizing means presses the end portion of the shaft section against the object to be joined, and the shaft section rotational drive means rotationally drives the jig section to rotate the jig body. 2. The friction stir welding apparatus according to claim 1, wherein the rotation speed of the driving means is lower before the pressure rotation of the shaft portion than after that. 4. The control means controls the displacement amount ΔL1 into which the end portion of the jig body presses the article to be joined by the pressing means for the jig body to a small value. The friction stir welding apparatus according to any one of claims 1 to 3. 5. A friction stir welding jig, comprising a jig body having an end portion for pressing an object to be welded and having an insertion hole extending along an axis, and the axis line being inserted through the insertion hole. A friction stir welding jig that is provided so as to be displaceable in any direction and that includes a shaft portion that has an end portion that can project from the end portion of the jig body, and a jig that presses the end portion of the jig body against the object to be joined. A pressing means for the tool body, a pressing means for the shaft part that presses the end of the shaft part against the object to be joined, a rotational driving means for the shaft part that rotationally drives the shaft part, and a jig body, A heating means for heating the object to be pressed, a jig body pressing means, a shaft pressing means, a shaft rotation driving means, and a controlling means for individually controlling the heating means. A friction stir welding device characterized by. 6. The control means heats the article to be joined by the heating means in a state where the end portion of the jig body is pressed against the article by the jig body pressing means, 6. The shaft part is rotationally driven by the shaft part rotational drive device while the shaft part pressurizing device presses the end portion of the shaft part against the object to be joined in a pressurized state. Friction stir welding equipment. 7. The friction stir welding apparatus according to claim 1, wherein the friction stir welding apparatus is an apparatus for performing spot welding. 8. A jig main body having an end portion for pressing an object to be joined and having an insertion hole coaxial with an axis, and a jig which is inserted through the insertion hole and is displaceable in the axial direction. A friction stir welding jig, comprising: a shaft portion having an end portion that can project from the end portion of the main body. 9. A jig body having an end portion for pressing an object to be joined and having an insertion hole coaxial with an axis, and a jig which is inserted into the insertion hole and is displaceable in the axial direction. A friction stir welding jig, comprising: a shaft portion having an end portion that can project from the end portion of the main body; and heating means that is built in the jig main body and that heats an object to be welded to be pressed. 10. The friction stir welding jig according to claim 8, which is a jig for performing spot welding.