JP4740289B2 - Friction stir welding equipment - Google Patents

Description

  The present invention relates to a friction stir welding apparatus that performs an object to be joined, such as spot welding, by friction stir welding.

  FIG. 9 is a partial cross-sectional view of the prior art friction stir welding apparatus 1. The rotor 2 has a right columnar pin 5 protruding toward the workpieces 3 and 4 and a distal end portion 6 on which a base end portion of the pin 5 is integrally provided. The lower end face of FIG. 9 facing 5 forms a shoulder portion 7. 9, while the rotor 2 is driven to rotate about its axis, the rotor 2 moves linearly to the workpieces 3 and 4, the lower end surface of the pin 5 comes into contact with the surface of the workpiece 3, and the rotor 2 is Further, the pressure is applied so as to press the objects 3 and 4 to be displaced downward in FIG. 9, and the shoulder portion 7 of the distal end portion 6 comes into contact with the object 3 and pressurizes together with the pins 5. The shoulder portion 7 enters the workpieces 3 and 4. The objects to be bonded 3 and 4 are partially softened by frictional heat between the rotor 2 and the objects to be bonded 3 and 4, and the softened portions are stirred to bond the objects to be bonded 3 and 4.

  FIG. 10 is an enlarged cross-sectional view of the workpieces 3 and 4 that are friction stir welded using the prior art rotor 2 shown in FIG. The objects 3 and 4 are aluminum plates, for example. In this prior art, the pin 5 and the tip portion 6 having the shoulder portion 7 press the workpieces 3 and 4 while rotating integrally, so that the shoulder portion 7 to the workpiece 3 shown in FIG. The bite is large, and as a result, the thickness Δd1 of the joined portions 11 and 12 of the article 3 to be joined in the joining regions 8 and 9 of the articles 3 and 4 is small. Therefore, there is a problem that the shear strength in the left-right direction in FIG. If an attempt is made to increase the thickness Δd1 of the joined portions 11 and 12, the amount of biting of the shoulder portion 7 into the article 3 to be joined becomes small, thereby causing the thickness of the article 3 to be joined (the vertical direction in FIG. 10). Insufficient material agitation results in reduced bond strength. Further, in order to set the thickness Δd1 of the joint portions 11 and 12 to an appropriate thickness, the rotor 2 having various dimensional shapes must be prepared in accordance with the difference in the thickness of the workpieces 3 and 4. If it does so, the exchange work of the rotor 2 is required, workability | operativity is bad, and productivity is inferior.

  As the shoulder portion 7 penetrates deeply into the joined portion 3, a raised portion 13 that 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. This also causes a decrease in strength and inferior bonding quality.

  Since the rotor 2 is rotationally driven, the rotor 2 contacts and presses the workpieces 3 and 4, so that the rotor sways and the pins 5 and the shoulder portion 7 are joined to the workpieces 3 and 4. There is a problem that the accuracy of the position is low.

  Moreover, since the pin 5 rotated at high speed first contacts the workpiece, there is a risk that the friction stir operation may be performed in a state where the superposed workpieces 3 and 4 are not sufficiently adhered, that is, there is a gap. is there. When the friction stir operation is performed on the two objects to be bonded 3 and 4 in a state where there is a gap, the bonding portion of the objects to be bonded 3 decreases, and the shear strength of the objects to be bonded 3 and 4 to be bonded decreases. .

An object of the present invention is to improve joint strength such as shear strength, and can use a common friction stir welding jig regardless of the objects to be joined having various thicknesses. to provide a friction stir welding equipment that allow.

The present invention is a friction stir welding jig,
A jig main body having an end for pressing the object to be joined, and having an insertion hole coaxial with the axis;
A friction stir welding jig including a shaft portion that is inserted into the insertion hole and is provided so as to be displaceable in the axial direction and has an end portion that can project from the end portion of the jig body;
Pressurizing means for a jig body that pressurizes the end of the jig body against an object to be joined;
Rotation driving means for jig body for rotating the jig body;
A pressurizing unit for the shaft that pressurizes the end of the shaft to the workpiece;
A rotation driving means for a shaft for rotating the shaft;
A jig main body pressing means, a jig main body rotation driving means, a shaft portion pressing means, and a shaft portion rotation driving means for individually controlling,
The control means
In a state where the end of the jig body is pressed against the object to be joined by the jig body pressing means, the jig body rotation driving means is started by the jig body rotation driving means,
While pressing the end of the jig body to the object to be joined by the jig body pressing means, the jig body is rotated by the jig body rotation driving means,
In the pressurizing state of the jig body, the shaft portion is rotated by the shaft portion rotational driving means while the end portion of the shaft portion is pressed against the object by the shaft portion pressing means,
In the friction stir welding apparatus according to the present invention, the rotational speed of the rotation driving means for the jig main body is lower than the rotational speed before the rotation of the shaft portion under pressure.

  According to the present invention, the friction stir welding jig includes a jig main body and a shaft portion coaxially inserted through the insertion hole of the jig main body, and the jig main body and the shaft portion are for the jig main body. It operates by each means of pressurization and rotation drive, and the shaft part operates by each means of pressurization and rotation drive for the shaft part. Therefore, pressurization and rotational driving of the jig main body and the shaft portion can be individually controlled. Therefore, the amount of biting into the workpiece, which is the base material, can be individually set for the jig body and the shaft portion, so that it is possible to improve the bonding strength such as shear strength and various thicknesses. Friction stir welding jigs common to objects to be joined can be used, workability is good, and the occurrence of the raised portion 13 described in relation to FIG. The material and the bonding strength can be improved. The rotation direction of the jig body and the shaft portion may be the same direction or the reverse direction.

  According to the present invention, the jig main body of the friction stir welding jig presses and presses the object to be joined by the jig main body in a state where the jig main body is rotationally driven at the low rotation speed V3, and thus is cured. In a state where the tool body is rotating at a low rotation speed, the shaft is rotated while being pressed. Therefore, the object to be joined is pressurized by the jig body, and the joining position, particularly the joining position during spot joining can be set with high accuracy. Further, when joining two overlapping objects to be bonded, the gap between the objects to be bonded can be eliminated over a wide range by pressing the objects to be bonded with a jig body having an area larger than the shaft portion. Reliable joining can be performed.

In the present invention, the control means has a displacement amount ΔL1 in which the end of the jig body pressurizes the object to be joined by the jig body pressurizing means,
The shaft portion pressurizing means controls the end portion of the shaft portion so as to have a value smaller than a displacement amount ΔL2 that presses and enters the workpiece.

  According to the present invention, the displacement amount ΔL1 at which the end portion of the jig body enters the workpiece is independent of the displacement amount ΔL2 at which the end portion of the shaft portion enters the workpiece. Therefore, by reducing the displacement amount ΔL1 of the jig main body, it is possible to improve the joining strength such as the shear strength and to describe it in relation to the above-mentioned prior art. Occurrence of the raised portions can be suppressed, and the bonding quality can be improved.

Moreover, the present invention is an apparatus for performing spot bonding .

According to the present invention, by performing Thus spot joining the equipment described above, it is possible to improve the bonding strength of the joint portion, it is possible to obtain good bonding quality.

  As described above, according to the present invention, by pressing and rotating the jig main body and the shaft part separately, the amount of biting into the workpiece to be joined can be reduced. It can be set individually with respect to the part, so that it is possible to improve the joint strength such as shear strength, and a friction stir welding jig common to the workpieces having various thicknesses can be used, The workability is good, and further, the occurrence of the raised portion 13 described in relation to FIG. 10 described above can be suppressed, and the material content and the bonding strength of the raised portion can be improved.

  Further, according to the present invention, since the jig body presses the object to be joined in a state where the jig main body of the friction stir welding jig is rotationally driven at a low rotational speed V3, the bonding position of the spot bonding is highly accurate. Can be set. Further, the gap between the objects to be bonded can be eliminated, and reliable bonding can be performed.

  According to the present invention, when the object to be joined is softened by frictional heat generated by the rotation of the jig body in this way, the displacement ΔL1 at which the end of the jig body enters the object to be joined is reduced, thereby reducing the object to be joined. While joining strength, such as the shear strength of a joined material, can be improved, generation | occurrence | production of the said protruding part can be suppressed and joining quality can be improved.

  Further, according to the present invention, by performing spot bonding, it is possible to improve the bonding strength of the bonded portion and to obtain good bonding quality.

  FIG. 1 is a cross-sectional view showing a joining operation of a reference example of the present invention. A plurality of, for example, two workpieces 21 and 22 stacked one above the other are joined by a friction stirrer provided with a friction stir welding jig 23 according to the present invention. The jig 23 includes a jig body 24 and a shaft portion 25 through which the jig body 24 is inserted. The jig body 24 has a right cylindrical shape, and an insertion hole 27 is formed coaxially with the axis 26 thereof. In the shaft portion 25, the insertion hole 27 is arranged coaxially with the axis line 26. The shaft portion 25 has a right cylindrical shape. An end face 32 of the end portion 31 of the jig main body 24 is perpendicular to the axis line 26. The end surface 34 of the end portion 33 of the shaft portion 25 is also perpendicular to the axis line 26. The shaft portion 25 is formed so as to be able to be immersed in and protrude from the jig body 24. The shaft portion 25 only needs to have a shape that can apply pressure and rotational frictional heat to the workpieces 21 and 22, and has a shape other than a right circular column shape, for example, a conical shape that contracts as it goes to the tip. Also good.

  FIG. 2 is a simplified cross-sectional view of a friction stir welding apparatus 35 using the friction stir welding jig 23 shown in FIG. The objects 21 and 22 are mounted on the surface plate 36 and fixed. In the apparatus main body 37 fixedly provided in this state, the jig main body pressing means 41 for pressing the end portion 31 of the jig main body 24 to the workpieces 21 and 22 and the jig main body 24 are arranged on the axis thereof. 26, a jig body rotation driving means 42 that rotates around the shaft 26, a shaft portion pressing means 43 that presses the end 33 of the shaft portion 25 against the workpieces 21 and 22, and the shaft portion 25 around its axis 26. And a shaft rotation driving means 44 for rotationally driving. Each of these means 41 to 44 includes, for example, a servo motor. The detection means 46 detects the joining state of the objects 21 and 22 to be joined by the jig 23. The detection means 26 may be realized by an optical sensor or a television camera, for example. 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 such as a six-axis multi-joint robot.

  FIG. 3 is a block diagram showing an electrical configuration 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 detection means 46 and controls the operation of each of the means 41 to 44 described above. The detection means 46 may have a configuration for detecting a motor load current included in each of the means 41 to 44 to detect a 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). FIG. 5 explains the operation of the processing circuit 47 shown in FIG. It is a flowchart for. The processing circuit 47 sequentially achieves the operation modes shown in Table 1 of the friction stir welding apparatus 35.

  The jig main body 24 of the friction stir welding jig 23 is moved downward and upward by the jig main body pressing means 41 as shown in FIG. It is rotationally driven as shown in (C). The pressure applied to the jig body 24 by the pressurizing means 41 is shown in FIG.

  The shaft portion 25 is moved downward and upward as shown in FIG. 4 (B) by the shaft portion pressurizing means 43 and is rotationally driven by the shaft portion rotation driving means 44 as shown in FIG. 4 (D). The The applied pressure 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. is doing. When a friction stir welding command is given from the outside, the processing circuit 47 places the friction stir jig 23 above the joining position and proceeds to step a2.

  In step a2, after time t1, the processing circuit 47 shifts the friction stirring jig 23 to the second operation mode and lowers the jig body 24 by the jig body pressing means 41. 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 portion 25 is lowered by the shaft pressing means 43.

  When reaching the time t3 from the time t2, the processing circuit 47 shifts the friction stirring jig to the fourth operation mode, and rotates the shaft portion 25 by the shaft portion rotation driving means 44. When it is detected that the jig main body 24 and the shaft portion 25 are lowered and the end surface 32 of the jig main body 24 is in contact with the workpiece 21, the process proceeds to step a3.

  In step a3, as shown in FIG. 1 (2), the end face 32 of the jig body 24 contacts the workpiece 21. When reaching the time t4 from the time t3, the processing circuit 47 shifts the friction stirring jig 23 to the fifth operation mode, and the jig body 24 is preliminarily applied to the workpiece 21 by the jig body pressing means 41. Pre-pressurize with pressure P1. By performing the pre-pressurization, the gap between the workpieces 21 and 22 is eliminated, and the workpieces 21 and 22 are brought into close contact with each other. When the workpieces 21 and 22 come into close contact with each other, the process proceeds to step a4.

  In step a4, when the time t4 reaches the time t5, the shaft portion 25 comes into contact with the workpiece 21 and the processing circuit 47 shifts the friction stirring jig 23 to the sixth operation mode. In the sixth operation mode, the shaft portion pressurizing means 43 rotates and presses the shaft portion 25 onto the workpiece 21 with the applied pressure P2. As a result, as shown in FIG. 1 (3), frictional heat is generated by the shaft portion 25 and the workpiece 21, the workpiece 21 near the shaft portion 25 is softened, and the shaft portion 25 becomes the workpiece 21. Bite.

  When reaching the time t6 from the time t5, the processing circuit 47 shifts the friction stirring jig 23 to the seventh operation mode. In the seventh operation mode, the jig body 24 is pressurized by the jig body pressurizing means 41 with a pressure P3 larger than the preliminary pressure P1. As a result, as shown in FIG. 1 (4), frictional heat is generated by 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. The objects 21 and 22 partially bite into the friction stir state.

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

  The shaft portion 25 is set to a pressure and a rotation speed sufficient to stir the softened portions of the workpieces 21 and 22, and the jig body 24 softens the workpiece, and the stirring of the softened portions is small. The pressure and rotation speed are set.

  For example, the rotation speed V2 of the shaft portion 25 by the shaft portion rotation driving means 44 is set to a higher value than the rotation speed V1 of the jig body 24 by the jig body rotation driving means 42. That is, V1 <V2. Further, the jig body 24 and the shaft portion 25 are pressurized by the pressurizing means 41 and 43, and the shaft portion of the shaft portion 25 is compared with the pressing force P <b> 3 by the jig body pressurizing means 41 of the jig body 24. The pressure P2 applied by the pressurizing means 43 is set to a large value. That is, P3 <P2.

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

  In step a5, when the friction stir time W elapses and time t6 reaches time t7, the two workpieces 21 and 22 are softened and agitated to form a joined portion. Transition to the eighth operation mode. In the eighth operation mode, the pressurizing means 41 and 43 raise the jig body 24 and the shaft portion 25 while maintaining the rotation state.

  When reaching time t8 from time t7, the processing circuit 47 shifts the friction stir 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 driving means 42.

  When reaching time t9 from time t8, the processing circuit 47 shifts the friction stir jig 23 to the tenth operation mode. In the tenth operation mode, the rotation of the jig body 25 and the shaft portion 25 is stopped by the rolling drive means 42 and 44, and the process proceeds to step a6. In step a6, as shown in FIG. 1 (5), the friction stir jig 23 is arranged at a position above the joining position of the workpieces, and the series of operations is completed.

  The friction stirrer performs a friction stir operation in a state in which the gap between the objects 21 and 22 is eliminated by pre-pressurizing the object to be bonded by the jig body 24 in step a3. As a result, good friction stir welding can be performed without causing poor bonding. Moreover, since the rotation speed and the applied pressure of the jig body 24 and the shaft portion 25 can be individually controlled, the jig body 24 has a rotation speed suitable for softening the workpieces 21 and 22 and The pressure can be set, and the shaft portion 25 can be set to a rotation speed and pressure suitable for stirring the softened portions of the workpieces 21 and 22. Thereby, the region of the joint portion can be formed in a wide range, and the joint strength can be improved. Moreover, the rotation direction of the jig body 24 and the shaft portion 25 may be the same direction or opposite directions, and the rotation direction 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 in which the end portion of the jig body 24 presses and enters the workpieces 21 and 22 is pressed, and the end portion 55 of the shaft portion 25 presses the workpiece to be bonded by the pressing portion 43 for the shaft portion. Then, the jig body 24 enters the workpiece 21 by adjusting the rotational speed and the applied pressure between the jig body 24 and the shaft portion 25 so that the displacement amount is less than the displacement amount ΔL2, that is, ΔL1 <ΔL2. The amount can be reduced to improve the joint strength such as shear strength, and the occurrence of the raised portion described in relation to the above-mentioned prior art can be suppressed, and the joint quality can be improved. . For example, the displacement amount ΔL1 of the jig body 24 is set to 10% or less of the thickness of the workpiece 21 with which the jig body 24 first comes into contact. Since the fatigue strength of the workpiece decreases as the displacement amount ΔL1 increases, the minimum displacement amount is appropriately set as the displacement amount ΔL1 according to the required strength of the workpiece.

  FIG. 6 is an enlarged cross-sectional view of the workpieces 21 and 22 that are friction stir welded in a state where the gap between the workpieces 21 and 22 is eliminated. The workpieces 21 and 22 are joined over a relatively wide joining region 48 and 49, and the thickness Δd2 of the joining portions 51 and 52 is sufficiently thick, and the bulge 53 is negligible. The friction stir welding according to the present invention can be joined in a state in which the gap between the workpieces 21 and 22 is eliminated. Therefore, a joining state similar to that of FIG. 6 can be obtained, and the objects 21 and 22 to be joined can be joined over the wide joining regions 48 and 49, and the friction stir welding strength can be sufficiently increased.

  In the above-described reference example, in the fourth to sixth operation modes, the jig main body 24 is in a stopped state without rotating. However, as an embodiment of the present invention, in the fourth to sixth operation modes, the jig body 24 is stopped. The main body 24 may remain rotationally driven at the low speed V3 by the jig main body rotational driving means 42. This low rotation speed V3 is less than the above-described speed V1 after time t2 of the pressurization rotation of the shaft portion 25 (V3 <V1). Also in such an embodiment, since the jig main body 24 contacts and pressurizes the workpieces 21 and 22 at the low rotational speed V3 described above, the jig main body 24 can be joined to a precise position with high accuracy. it can.

  FIG. 7 is a partial cross-sectional view of another embodiment of the present invention. This embodiment is similar to the above-described embodiment, and corresponding portions are denoted by 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 main body 24 of the friction stir welding jig 23. The heating means 55 may be, for example, an electric heater, or may be an induction heating coil to which power is supplied from an AC power source. In the embodiment shown in FIG. 7, the jig body pressing means 41 for moving the jig body 24 up and down to pressurize is provided, but not provided in the jig body rotation driving means 40. The tool body 24 does not rotate. The shaft portion 25 is moved up and down and pressurized by the shaft portion pressurizing means 43, and is rotationally driven by the shaft portion rotation driving means 44. The heating means 55 heats the workpieces 21 and 22 to a temperature at which they can be softened, and stirs the softened parts by pressurizing and rotating the shaft part 25.

  In the embodiment shown in FIG. 7, the jig body 24 is not rotated and stopped as described above, so that the end surface 32 of the end portion 31 does not bite into the workpiece 21 and is joined. It does not enter the objects 21 and 22. Therefore, as described in relation to the above-described prior art, the thickness of the bonded region of the article to be bonded 21 does not decrease, and a high bonding strength such as a shear strength can be achieved.

  FIG. 8 is a simplified side view showing a state in which the friction stir welding apparatus 35 of the present invention is attached to the wrist 58 of the robot 57. The robot 57 has a plurality of axes, reads the teaching content taught in advance from the memory, performs a reproduction operation, and can automatically perform spot welding, and the friction stir welding device 35 is set to a predetermined joining line. It is also possible to move along the bonding operation. In the above description, the jig main body 24 and the shaft portion 25 are raised and lowered. However, the jig main body 24 and the shaft portion 25 may be displaced in the pressing direction, and two objects to be joined in the horizontal direction may be joined. But it can be joined.

The following embodiments are possible for the present invention.
(1) A friction stir welding jig,
A jig main body having an end for pressing the object to be joined, and having an insertion hole coaxial with the axis;
A friction stir welding jig including a shaft portion that is inserted into the insertion hole and is provided so as to be displaceable in the axial direction and has an end portion that can project from the end portion of the jig body;
Pressurizing means for a jig body that pressurizes the end of the jig body against an object to be joined;
Rotation driving means for jig body for rotating the jig body;
A pressurizing unit for the shaft that pressurizes the end of the shaft to the workpiece;
A rotation driving means for a shaft for rotating the shaft;
A friction stir welding apparatus comprising: a jig body pressing means; a jig body rotation driving means; a shaft portion pressing means; and a shaft portion rotation driving means. .

(2) a jig main body having an end for pressing the object to be joined, and having an insertion hole coaxial with the axis;
A friction stir welding jig comprising: a shaft portion that is inserted into the insertion hole and is provided so as to be displaceable in the axial direction and has an end portion that can project from the end portion of the jig body.

(3) The control means starts rotation of the jig body by the jig body rotation driving means in a state where the end of the jig body is pressed against the object to be joined by the jig body pressurizing means. ,
In the pressurizing state of the jig main body, the shaft portion is rotationally driven by the shaft portion rotation driving means while the end portion of the shaft portion is pressed against the workpiece by the shaft portion pressing means. .

(4) The control means rotates the jig body by the jig body rotation driving means while pressing the end of the jig body to the workpiece by the jig body pressurizing means,
In the pressurizing state of the jig body, the shaft portion is rotated by the shaft portion rotational driving means while the end portion of the shaft portion is pressed against the object by the shaft portion pressing means,
The friction stir welding apparatus according to claim 1, wherein the rotational speed of the rotation driving means for the jig body is lower than the speed before the rotation of the shaft portion under pressure.

  The jig main body of the friction stir welding jig presses and presses the object to be joined by the jig main body while the rotation is stopped or the jig main body is rotated at a low rotational speed. Thus, in a state where the jig body is stopped or rotating at a low rotation speed, the shaft portion is rotationally driven while being pressurized. Therefore, the object to be joined is pressurized by the jig body, and the joining position, particularly the joining position during spot joining can be set with high accuracy. Further, when joining two overlapping objects to be bonded, the gap between the objects to be bonded can be eliminated over a wide range by pressing the objects to be bonded with a jig body having an area larger than the shaft portion. Reliable joining can be performed.

  (5) Friction characterized in that the control means controls the displacement amount ΔL1 that the end of the jig main body presses into the object to be joined by the pressing means for the jig main body so as to be a small value. Stir welding device.

It is sectional drawing which shows joining operation | movement of the reference example of this invention. FIG. 2 is a simplified cross-sectional view of a friction stir welding apparatus 35 using the friction stir welding jig 23 shown in FIG. 1. It is a block diagram which shows the electric constitution of the friction stir welding apparatus 35 shown by FIG. It is a timing chart for demonstrating operation | movement of the friction stir welding apparatus 35 shown by FIG. 1 (1)-FIG. 1 (5). 4 is a flowchart for explaining the operation of a processing circuit 47 shown in FIG. 3. It is an expanded sectional view of the to-be-joined objects 21 and 22 friction-stir-joined in the state which eliminated the clearance gap between the to-be-joined objects 21 and 22. It is a partial sectional view of other embodiments of the present invention. FIG. 3 is a simplified side view showing a state where the friction stir welding apparatus 35 of the present invention is attached to a wrist 58 of a robot 57. 1 is a cross-sectional view of a part of a prior art friction stir welding apparatus 1. It is an expanded sectional view of the to-be-joined objects 3 and 4 friction-stir-joined using the rotor 2 of the prior art shown by FIG.

Explanation of symbols

21, 22 Workpiece 23 Friction stir welding jig 24 Jig body 25 Shaft part 26 Axis line 27 Insertion hole 31, 33 End part 32, 34 End face 35 Friction stir welding device 41 Jig body pressurizing means 42 Jig body Rotation driving means 43 Shaft pressing means 44 Shaft rotation driving means 55 Heating means

Claims (3)

A friction stir welding jig,
A jig main body having an end for pressing the object to be joined, and having an insertion hole coaxial with the axis;
A friction stir welding jig including a shaft portion that is inserted into the insertion hole and is provided so as to be displaceable in the axial direction and has an end portion that can project from the end portion of the jig body;
Pressurizing means for a jig body that pressurizes the end of the jig body against an object to be joined;
Rotation driving means for jig body for rotating the jig body;
A pressurizing unit for the shaft that pressurizes the end of the shaft to the workpiece;
A rotation driving means for a shaft for rotating the shaft;
A jig main body pressing means, a jig main body rotation driving means, a shaft portion pressing means, and a shaft portion rotation driving means for individually controlling,
The control means
In a state where the end of the jig body is pressed against the object to be joined by the jig body pressing means, the jig body rotation driving means is started by the jig body rotation driving means,
While pressing the end of the jig body to the object to be joined by the jig body pressing means, the jig body is rotated by the jig body rotation driving means,
In the pressurizing state of the jig body, the shaft portion is rotated by the shaft portion rotational driving means while the end portion of the shaft portion is pressed against the object by the shaft portion pressing means,
The friction stir welding apparatus according to claim 1, wherein the rotational speed of the rotation driving means for the jig body is lower than the speed before the rotation of the shaft portion under pressure. The control means has a displacement amount ΔL1 in which the end of the jig body pressurizes the object to be joined by the jig body pressurizing means,
2. The friction stir welding apparatus according to claim 1, wherein the shaft portion pressurizing means controls the end portion of the shaft portion to have a value smaller than a displacement amount ΔL <b> 2 that presses and enters the workpiece. The friction stir welding apparatus according to claim 1 or 2, wherein the apparatus is a spot welding apparatus.

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