JP2018001178A - Tool for friction stirring and friction stirring bonding device having tool for friction stirring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for friction stirring capable of controlling flow of fluidized metal which is caused to flow into a gap between a probe support hole of a shoulder and a stirring probe in a fillet friction stirring bonding.SOLUTION: A tool for fillet friction stirring bonding for performing friction stirring bonding of metal members Wa, Wb includes: a stirring probe 20 which is rotated in such a state as to be pushed against the metal members Wa, Wb and stirs the softened fluidized metal while applying friction heat; and a shoulder 30 which has a probe support hole 33, supports the stirring probe 20 rotated by the probe support hole 33 and, at the same time, is caused to slide on the metal members Wa, Wb. Therein, a flow hindrance surface 25, which obstructs further flow along an axial direction of the stirring probe 20 of the fluidized metal when the fluidized metal is caused to flow into the gap S between the probe support hole 33 of the shoulder 30 and the stirring probe 20, is provided on the stirring probe 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a friction stir welding tool and a friction stir welding apparatus having a friction stir tool used for, for example, friction stir welding (FSW) and friction stir processing (FSP).

  Conventionally, as a friction stir tool used for the friction stir welding described above, for example, there is one described in Patent Document 1. This friction stir tool is a fillet friction stir welding tool that performs friction stir welding to an inner corner formed by abutting a pair of metal members, and is a rotational drive that forms a rotational drive mechanism together with a bearing A stirring probe that is connected to a shaft and rotates while being pressed across a pair of metal members, and a shoulder that supports the stirring probe are provided.

  The stirring probe that rotates while being pressed across a pair of metal members is softened while applying frictional heat to the inner corners between the pair of metal members, and the surrounding flowing metal (fluid) By kneading, a pair of metal members are integrated.

  On the other hand, the shoulder has a probe support hole through which the agitation probe passes, and slides on the inner corner between the pair of metal members while supporting the agitation probe rotating in the probe support hole. The beaded bead is formed by leveling the mixed fluid metal around it.

JP 2011-079031

  However, in the conventional friction stir welding tool described above, the friction between the shoulder probe support hole and the stirrer probe increases as the friction stir welding continues, and the gap between the two expands. The fluidized metal softened and kneaded by the frictional heat generated in the step flows into the gap between the shoulder probe support hole and the stirring probe while continuing the friction stir welding.

  Here, for example, when the pair of metal members is an aluminum alloy and the friction stir welding tool is tool steel (SKD61), a long distance friction stir welding or a friction stir welding performed by supplying an aluminum wire However, the inflow of fluid metal becomes more conspicuous, and there is a possibility of adversely affecting the rotary drive mechanism composed of the rotary drive shaft and the bearing. It was an issue.

  The present invention has been made paying attention to the above-described conventional problems, and the fluid that has been softened and mixed by frictional heat flowing into the gap between the shoulder probe support hole and the agitation probe becomes a rotational drive mechanism. It is an object of the present invention to provide a friction stir welding apparatus having a friction stir tool and a friction stir tool capable of suppressing adverse effects to a minimum.

  A first aspect of the present invention is a friction stir tool that frictionally stirs a workpiece, the workpiece being rotated and softened while applying frictional heat while pressed against the workpiece. A stirring probe that stirs the fluid, and a probe support hole through which the stirring probe passes, and a shoulder that slides on the workpiece while supporting the stirring probe rotating in the probe support hole, The stirrer probe has a flow inhibition that prevents further flow of the fluid along the axial direction of the stirrer probe when the fluid flows into the gap between the probe support hole of the shoulder and the stirrer probe. It is set as the structure by which the part is provided.

  In the second aspect of the present invention, the flow inhibiting portion changes the flow direction of the fluid flowing in from the gap between the probe support hole of the shoulder and the stirring probe from the axial direction of the stirring probe to the radial direction. The flow blocking surface is changed or reversed.

  3rd aspect of this invention WHEREIN: The said flow inhibition part is set as the structure which is a flow inhibition surface which cross | intersects with respect to the axial direction of the said stirring probe.

  In the fourth aspect of the present invention, the fluid in which further flow along the axial direction of the stirring probe is blocked by the flow blocking portion is accumulated between the probe support hole of the shoulder and the stirring probe. It is set as the structure by which the fluid accommodating part is provided.

  5th aspect of this invention WHEREIN: The said shoulder is set as the structure provided with the fluid discharge hole which discharges | emits the said fluid accumulated in the said fluid accommodating part.

  In the sixth aspect of the present invention, the shoulder is configured such that an extended accommodating portion for storing the fluid is provided continuously to the fluid accommodating portion.

  According to a seventh aspect of the present invention, a plurality of combinations each including the flow inhibition portion of the stirring probe, the probe support hole of the shoulder, and the fluid containing portion between the stirring probes are provided. Yes.

  In an eighth aspect of the present invention, the shoulder is provided with a guide that guides the flow of the fluid around the stirring probe in the fluid accommodating portion and guides the fluid to the fluid discharge hole. .

  On the other hand, a ninth aspect of the present invention is a friction stir welding apparatus that performs friction stir welding by butting a pair of workpieces, and the friction stir welding tool according to any one of claims 1 to 8, A rotary drive shaft for rotating the stirring probe of the friction stirring tool in a state of being pressed against the butted portions of the pair of workpieces, and the friction stirring for supporting the stirring probe rotated by the rotary drive shaft It is set as the structure provided with the feed mechanism which slides the said shoulder of a tool along the abutting part of a pair of said to-be-processed member.

  According to the friction stir tool according to the present invention, even if the shoulder and the stirring probe are not frequently cleaned or replaced, they are softened and kneaded by the frictional heat flowing into the gap between the shoulder probe support hole and the stirring probe. The excellent effect that the mixed fluid can suppress the adverse effect on the rotational drive mechanism of the stirring probe can be reduced.

It is front explanatory drawing (a) and side explanatory drawing (b) which show the friction stir welding apparatus provided with the fillet friction stir welding tool as a friction stir tool concerning one Example of this invention. It is the expansion explanatory drawing (a) which expands and shows the fillet friction stir welding tool of Fig.1 (a), and the expanded sectional explanatory drawing (b) from a side surface direction. FIG. 3 is an overall perspective view from below of a shoulder in the fillet friction stir welding tool shown in FIG. 2. It is a cross-sectional explanatory drawing from the side direction of the situation which is performing the fillet friction stir welding of the fillet friction stir welding tool shown in FIG. It is sectional explanatory drawing from the side surface which shows the fillet friction stir welding tool as a tool for friction stirring which concerns on the other Example of this invention. It is sectional explanatory drawing from the side surface which shows the fillet friction stir welding tool as a tool for friction stirring which concerns on the further another Example of this invention. It is a whole perspective explanatory view from the top which shows the shoulder of the fillet friction stir welding tool as a friction stir tool according to still another embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of a friction stir tool according to the present invention. In this embodiment, the fillet friction stirrer in which the friction stir tool according to the present invention is provided in a friction stir welding apparatus is shown. A case of a joining tool will be described as an example.

  As shown in FIGS. 1A and 1B, the friction stir welding apparatus 1 includes a horizontal frame 2, a portal frame 3 provided on the horizontal frame 2, and an X-axis direction on the horizontal frame 2. An X-axis table 4 that moves along the rail 2a, a Z-axis table 5 that moves up and down along the Z-axis rail 3a that is arranged on the portal frame 3, and a Y-axis that is arranged on the Z-axis table 5. A Y-axis table 6 that moves along a direction rail 5a, and a spindle unit 9 that is mounted on the Y-axis table 6 along the Z-axis direction.

The X-axis table 4 is moved by the output of the motor 8x transmitted through the ball screw mechanism (feeding mechanism) 7x, and the X-axis table 4 is a workpiece to be subjected to fillet joining. A jig 4a for holding a pair of flat metal members Wa and Wb (in this embodiment, an aluminum alloy flat plate) in a V shape is disposed.
The Z-axis table 5 and the Y-axis table 6 are also moved by the outputs of the motors 8z and 8y transmitted via the ball screw mechanisms 7z and 7y.

  The fillet friction stir welding tool 10 equipped in the friction stir welding apparatus 1 has an inner corner formed by abutting a pair of metal members Wa and Wb and straddles between the pair of metal members Wa and Wb. A stirring probe 20 that rotates in a pressed state and a shoulder 30 that supports the rotating stirring probe 20 are provided. The stirring probe 20 is connected to the rotational drive shaft 9 a of the main spindle unit 9, and the shoulder 30 is fixed to the tool holder 9 b of the main spindle unit 9. The stirring probe 20 and the shoulder 30 are made of tool steel, for example, SKD61.

  As shown in FIG. 2B, the stirring probe 20 of the fillet friction stir welding tool 10 includes a large diameter cylindrical portion 21, an intermediate diameter cylindrical portion 22, a small diameter cylindrical portion 23, and a probe main body 24. The inner corner portion that is rotated by the rotational force applied from the rotation drive shaft 9a of the main shaft unit 9 and softened while applying frictional heat to the inner corner portion between the pair of metal members Wa and Wb and its periphery A pair of metal members Wa and Wb are integrated by kneading the fluid metal (fluid). In addition, the rotation speed of the stirring probe 20 is 500-1500 (rpm), and changes with the materials and thickness of the metal members Wa and Wb.

  On the other hand, as shown in FIG. 3, the shoulder 30 of the fillet friction stir welding tool 10 includes a flat plate portion 31 that is attached to a tool holder 9 b of the spindle unit 9 by a bolt (not shown), and a tool holder for the flat plate portion 31. The cylindrical portion 32 protrudes on the opposite side of 9b, and the central hole of the cylindrical portion 32 serves as a probe support hole 33 that supports the medium-diameter column portion 22 and the small-diameter column portion 23 of the rotating stirring probe 20. Is formed.

  In addition, the cylindrical portion 32 of the shoulder 30 is formed with a pair of molding surfaces 34 and 34 that approach each other and intersect each other, and the angle formed by the pair of molding surfaces 34 and 34 is as follows. When performing fillet friction stir welding, the inner corner is set to abut against the pair of metal members Wa and Wb.

  The shoulder 30 slides relative to the pair of metal members Wa and Wb on the X-axis table 4 that is moved by the output of the motor 8x transmitted through the ball screw mechanism 7x. During this sliding, the flow metal mixed and mixed by the stirring probe 20 indicated by the phantom line in FIG. 2A at the inner corner between the pair of metal members Wa and Wb is formed on the pair of molding surfaces 34 and 34. Equally form the joint. The sliding speed of the shoulder 30 of the fillet friction stir welding tool 10 varies depending on the amount of the gap between the metal members Wa and Wb in addition to the material and thickness of the metal members Wa and Wb.

  At this time, in the portion (the right side portion in FIG. 3) located on the front side of the pair of molding surfaces 34, 34 of the shoulder 30, the flowing metal stirred by the stirring probe 20 is formed with the molding surfaces 34, 34 and the metal member Wa. , Wb, a pair of guide slopes 35, 35 are disposed.

  Here, it goes without saying that the gap S between the probe support hole 33 of the shoulder 30 and the small diameter cylindrical portion 23 of the stirring probe 20 is desirably as narrow as possible. In the case where the joint section is long distance, the gap S between the two is enlarged due to wear generated in the sliding portion between the probe support hole 33 of the shoulder 30 and the small-diameter cylindrical portion 23 of the stirring probe 20 while the friction stirring is continued. Therefore, the flowing metal flowing into the gap S due to the rotation of the stirring probe 20 is unavoidable.

  Therefore, in this embodiment, when the flowing metal flows into the gap S between the probe support hole 33 of the shoulder 30 and the small-diameter cylindrical portion 23 of the stirring probe 20, the flowing metal further moves along the axial direction of the stirring probe 20. The agitation probe 20 is provided with a flow inhibition portion that prevents flow.

The flow inhibition portion is an annular flow inhibition surface 25 continuously formed around the root of the small diameter cylindrical portion 23 at the boundary between the medium diameter cylindrical portion 22 and the small diameter cylindrical portion 23. In this embodiment, the annular flow-inhibiting surface 25 is formed along a surface that crosses the stirring probe 20 substantially vertically, and between the flow-inhibiting surface 25 and the small-diameter cylindrical portion 23 (the root of the small-diameter cylindrical portion 23). ) Is continuously rounded.
Therefore, the flow-inhibiting surface 25 agitates the flow direction of the flowing metal flowing from the gap S between the probe support hole 33 of the shoulder 30 and the small-diameter cylindrical portion 23 of the agitation probe 20, as indicated by an arrow A in FIG. It functions to change from the axial direction of the probe 20 to the radial direction.

In other words, the flow inhibition portion only needs to be a flow inhibition surface that intersects the axial direction of the stirring probe 20, and is not limited to the flow inhibition surface 25 that changes the flow direction of the flowing metal to the radial direction. Absent. For example, as shown by phantom lines in FIG. 2 (b), a mortar-shaped flow inhibition surface 26 that reverses the flow direction of the flowing metal may be used. It is good also as an annular surface which inclines toward the probe main body 24 side gradually as it goes to the periphery in the end surface of the cylindrical part 22. FIG.
The flow-inhibiting surface 26 having such a shape is intended to flow the flowing metal that has flowed in from the gap S and reached the end surface of the medium-diameter cylindrical portion 22 toward the probe main body 24 while moving toward the periphery of the intermediate-diameter cylindrical portion 22. Function.

  Further, in this embodiment, a flowing metal in which further flow along the axial direction of the stirring probe 20 is blocked by the flow blocking surface 25 between the probe support hole 33 of the shoulder 30 and the small diameter cylindrical portion 23 of the stirring probe 20 is provided. An annular fluid container 36 is provided for storage. The fluid container 36 is not limited to an annular shape, and the fluid container 36 may be semicircular or C-shaped.

  In addition, in this embodiment, when the fluid container 36 is filled with a fluid metal, the fluid discharge hole 37 that discharges the fluid metal accumulated in the fluid container 36 is formed in the cylindrical portion 32 of the shoulder 30. The flowing metal accumulated in the fluid container 36 flows out from the gap S1 between the probe support hole 33 of the shoulder 30 and the medium diameter cylindrical portion 22 of the stirring probe 20 to the tool holder 9b side of the spindle unit 9. I try to avoid doing it.

  The fluid discharge hole 37 is open on the side where the pair of metal members Wa and Wb are located with respect to the flat plate portion 31 (in this embodiment, the base portion of the cylindrical portion 32), and is accumulated in the fluid accommodation portion 36. The fluid metal is discharged from the fluid container 36 through the fluid discharge hole 37 to the outside of the shoulder 30 (the friction stir welding tool 10).

  Further, in this embodiment, the fluid discharge hole 37 is provided in a portion (the left portion in FIG. 2B) located on the rear side of the cylindrical portion 32 in the shoulder 30. That is, in this embodiment, for example, as shown in FIG. 4, when the filler wire F is supplied from the front side (right side in FIG. 2B) between the shoulder 30 and the metal members Wa and Wb, the fluid metal Is discharged to the rear side of the cylindrical portion 32 of the shoulder 30, so that it is possible to avoid the flow metal from interfering with the filler wire F supply mechanism and the filler wire F itself located on the front side of the shoulder 30. Joining can be performed more smoothly.

  The fluid discharge hole 37 is not necessarily provided in a portion of the shoulder 30 located on the rear side of the cylindrical portion 32, and the arrangement of the supply mechanism and the filler are set so that the discharged flow metal does not interfere with the filler wire F. If the supply direction of the wire F is devised, it can be provided on the left and right sides or the front side of the cylindrical portion 32 of the shoulder 30. Further, the shape, size, and number of the fluid discharge holes 37 are determined in consideration of the structural strength required for the shoulder 30.

  Reference numeral 39 in FIG. 2B denotes a bolt insertion hole, which is used when the flat plate portion 31 of the shoulder 30 is attached to the tool holder 9 b of the spindle unit 9.

  In the friction stir welding apparatus 1 equipped with the fillet friction stir welding tool 10, the stirring probe 20 of the fillet friction stir welding tool 10 is attached to an inner corner formed by abutting a pair of metal members Wa and Wb. In the pressed state, it is rotated by the rotary drive shaft 9a.

  Then, the X-axis table 4 is moved by the output of the motor 8x transmitted through the ball screw mechanism 7x, and the shoulder 30 supporting the rotating stirring probe 20 is moved between the pair of metal members Wa and Wb on the X-axis table 4. By sliding relatively with respect to the inner corner portion, the fluidized metal mixed in and around the inner corner portion between the pair of metal members Wa and Wb is leveled to form a joining bead.

  At this time, as shown in FIG. 4, the filler wire F supplied in the direction indicated by the pair of guide slopes 35, 35 of the shoulder 30 proceeding in the direction indicated by the hollow arrow causes the pair of molding surfaces 34, 34 and the metal member Wa to be supplied. , Wb. The filler wire F is usually made of the same material as the pair of metal members Wa and Wb, but a different type of filler wire F from the pair of metal members Wa and Wb may be used.

  When the shoulder 30 is slid in this manner, the fluidized metal softened and mixed by the frictional heat generated by the rotation of the stirring probe 20 will eventually become the probe support hole 33 of the shoulder 30 and the small diameter cylindrical portion 23 of the stirring probe 20. Into the gap S between the two.

  At this time, since the flow inhibition surface 25 is provided at the boundary between the medium diameter cylindrical portion 22 and the small diameter cylindrical portion 23 of the stirring probe 20, further flow along the axial direction of the flowing metal flowing into the gap S is prevented. It becomes.

  And between the probe support hole 33 of the shoulder 30 and the small diameter cylindrical part 23 of the stirring probe 20, a fluid container for storing a fluid metal in which the flow in the axial direction of the stirring probe 20 is blocked by the flow blocking surface 25. 36 is provided, until the fluid container 36 is filled with the fluidized metal that has flowed into the gap S, the fluidized metal is formed between the probe support hole 33 of the shoulder 30 and the medium-diameter cylindrical portion 22 of the stirring probe 20. Outflow from the gap S1 to the tool holder 9b side of the spindle unit 9 is avoided.

  When the shoulder 30 of the fillet friction stir welding tool 10 is slid to further continue the friction stir welding, the fluid container 36 is filled with the fluid metal, but the cylindrical portion 32 of the shoulder 30 includes Since the fluid discharge hole 37 for discharging the fluid metal accumulated in the fluid accommodation part 36 is provided, the fluid metal accumulated in the fluid accommodation part 36 is the medium diameter of the probe support hole 33 of the shoulder 30 and the stirring probe 20. Outflow from the gap S1 between the cylindrical portion 22 to the tool holder 9b side of the spindle unit 9 is prevented, and as a result, it is avoided that the flowing metal adversely affects the rotary drive shaft 9a.

  Further, since the fluid metal accumulated in the fluid container 36 is discharged from the fluid discharge hole 37, the inflow of the fluid metal into the fluid container 36 can be confirmed from the outside.

  Thus, in the fillet friction stir welding tool 10 and the friction stir welding apparatus 1 equipped with the fillet friction stir welding tool 10 according to this embodiment, the probe support hole 33 of the shoulder 30 and the small diameter of the stirring probe 20 are used. By controlling the flow of the flowing metal flowing into the gap S between the cylindrical portion 23, the flowing metal softened and mixed by frictional heat without frequently cleaning or replacing the shoulder 30 and the stirring probe 20 Can suppress the adverse effect of the stirring probe 20 on the rotational drive shaft 9a.

Here, the timing at which the flowing metal begins to adversely affect the rotational drive shaft 9a of the stirring probe 20 is the cleaning timing of the shoulder 30 and the stirring probe 20. The fillet friction stir welding tool 10 according to this embodiment and the corner In the friction stir welding apparatus 1 equipped with the meat friction stir welding tool 10, the friction stir welding can be performed over a long period without cleaning the shoulder 30 and the stirring probe 20. Will be realized.
Further, when the gap between the two is enlarged due to wear generated in the sliding portion between the probe support hole 33 of the shoulder 30 and the stirring probe 20, the replacement timing of the shoulder 30 and the stirring probe 20 is shown. Then, since the period during which friction stir welding can be performed without exchanging the shoulder 30 and the stirring probe 20 is long, the tool life is also increased.

  FIG. 5 shows a friction stir tool according to another embodiment of the present invention. In this embodiment, the friction stir tool according to the present invention is a fillet friction stir welding tool as an example. I will explain.

  As shown in FIG. 5, the shoulder 30 </ b> A of the fillet friction stir welding tool 10 </ b> A is different from the shoulder 30 of the fillet friction stir welding tool 10 in the previous embodiment through a fluid discharge hole 37. The expansion accommodating part 38 which accumulate | stores a fluid metal exists in the point which provided continuously in the fluid accommodating part 36, and another structure is the same as the shoulder 30 of the fillet friction stir welding tool 10 in a previous Example.

In this fillet friction stir welding tool 10A, fluid metal can be stored also in the extended accommodating portion 38, so that much fluid metal can be stored in the shoulder 30A. Therefore, also in this embodiment, it is possible to effectively suppress the flowing metal from flowing into the gap S between the probe support hole 33 of the shoulder 30A and the small diameter cylindrical portion 23 of the stirring probe 20.
In the form shown in FIG. 5, a fluid discharge hole is provided in at least one of the fluid storage part 36 and the expansion storage part 38 separately from the fluid discharge hole 37, so that the fluid storage part 36 and the extension are provided. The flowing metal may be discharged to the outside of the shoulder 30A from one or both of the accommodating portions 38.

  FIG. 6 shows a friction stir tool according to still another embodiment of the present invention. In this embodiment, the friction stir tool according to the present invention is a fillet friction stir welding tool as an example. I will give you a description.

  As shown in FIG. 6, this fillet friction stir welding tool 10B is different from the fillet friction stir welding tool 10 in the previous embodiment in that the probe support hole 33B of the shoulder 30B and the medium diameter of the stirring probe 20B are different. After setting the gap S1B between the cylindrical portion 22B as narrow as possible, the large-diameter cylindrical portion 21B of the stirring probe 20B is provided with a flow blocking surface 25B different from the flow blocking surface 25, and the shoulder 30B This is in that a fluid accommodation part 36B different from the fluid accommodation part 36 is provided between the probe support hole 33B and the medium diameter cylindrical part 22B of the stirring probe 20B.

  In other words, there are two combinations of the flow inhibition surface 25 of the stirring probe 20, the probe support hole 33 of the shoulder 30 and the fluid containing portion 36 between the small diameter cylindrical portion 23 of the stirring probe 20, Is the same as the fillet friction stir welding tool 10 in the previous embodiment.

  In this fillet friction stir welding tool 10B, when the joining section in one pass is a long distance, the fluid metal accumulated in the fluid container 36 that cannot be completely discharged from the fluid discharge hole 37 is the probe of the shoulder 30B. Even if it flows into the gap S1B between the support hole 33B and the middle diameter cylindrical portion 22B of the stirring probe 20B, further flow along the axial direction of the flowing metal flowing into the gap S1B is hindered, and the fluid container 36B Since it will accumulate again, it will be avoided that a fluid metal flows out to the tool holder 9b side of the spindle unit 9 until this fluid accommodating part 36B is filled with a fluid metal.

  In this embodiment, the fluid discharge hole 37 is continuously formed only in the fluid storage part 36, but the present invention is not limited to this, and the fluid discharge hole 37 is also provided in the fluid storage part 36B. May be formed continuously.

  Further, the number of combinations of the flow inhibition surface 25 of the stirring probe 20 and the fluid accommodation part 36 of the shoulder 30 may be three or more, for example, further above the fluid accommodation part 36B ( You may provide a flow obstruction surface and a fluid accommodating part in the rotation drive shaft 9a side. That is, a plurality of flow-inhibiting surfaces (fluid containing portions) may be provided side by side along the axial direction of the stirring probe 20B.

  Furthermore, as shown in FIG. 6, in this embodiment, the fluid container 36B located above the fluid container 36 (on the rotation drive shaft 9a side) has a larger diameter than the fluid container 36, In plan view, the fluid accommodation part 36B is arranged so as to surround the fluid accommodation part 36, and is formed so that the diameter of the fluid accommodation part located above (rotation drive shaft 9a side) becomes larger. May be.

  Furthermore, when a plurality of fluid storage portions are provided side by side along the axial direction of the stirring probe 20B, a fluid discharge hole 37 is provided only in the fluid storage portion 36 as in this embodiment, or a fluid storage portion is provided. A fluid discharge hole 37 is provided in at least one of the fluid storage parts other than the part 36, or a fluid discharge hole 37 is provided in all of the plurality of fluid storage parts. Also good.

  FIG. 7 shows a shoulder of a friction stir tool according to still another embodiment of the present invention. In this embodiment as well, the friction stir tool according to the present invention is a fillet friction stir welding tool. An example will be described.

  As shown in FIG. 7, the shoulder 30C is different from the shoulder 30 of the fillet friction stir welding tool 10 in the previous embodiment in the fluid containing portion 36C around the probe support hole 33B for the fluid metal. Guides 41 and 42 for guiding the flow to the fluid discharge hole 37 are provided, and the other configuration is the same as the shoulder 30 in the previous embodiment.

  In this case, the guide 41 has a block shape arranged adjacent to the fluid discharge hole 37. On the other hand, the guides 42 are ridges having a curved shape formed on the bottom surface 36a of the fluid container 36C, and a plurality of guides 42 are arranged at equal intervals around the probe support hole 33B, and the curved shapes are formed. The guide 42 is arranged so that the flowing metal is directed from the center toward the centrifugal side as it proceeds in the probe rotation direction (the direction indicated by the arrow in FIG. 7).

  That is, the flowing metal is guided by the plurality of guides 42 as the stirring probe (not shown) rotates and gradually moves to the centrifugal side, and reaches the fluid discharge hole 37 on the centrifugal side by the block-shaped guide 41. It is guided to the fluid discharge hole 37, that is, the fluid metal is smoothly guided to the fluid discharge hole 37.

  Therefore, in the shoulder 30C, the discharge of the fluid metal accumulated in the fluid container 36C from the fluid discharge hole 37 can be promoted.

  The guides 41 and 42 are not limited to the shape of this embodiment. For example, the guide 42 disposed around the probe support hole 33B is formed on the bottom surface 36a of the fluid container 36C. It may be a curved groove or a curved step, and the interval between adjacent guides 42 is not necessarily limited to an equal interval.

  In the above-described embodiment, the case where the friction stir tool according to the present invention is a fillet friction stir welding tool has been described as an example. However, the present invention is not limited to this. A friction stir welding tool that performs friction stir welding on the mating portion may be used. At this time, in the butting portion or the overlapping portion, the joining portion may be not only line joining but also point joining or surface joining. Good.

  In the above-described embodiment, the case where the friction stir tool according to the present invention is a fillet friction stir welding tool has been described as an example. However, the present invention is not limited thereto, and the friction stirrer according to the present invention is not limited thereto. The stirring tool may be used in the friction stirring process as a tool for thermal processing of materials.

Furthermore, in the above-described embodiment, the case where the friction stir tool according to the present invention is a shoulder fixed type has been described as an example. However, the present invention is not limited to this, and the stirring probe and the shoulder operate separately. It may be a double-action friction stir tool.
Here, in the case of a double-acting type friction stir tool in which the stirring probe and the shoulder rotate separately, there is a difference in relative rotational speed and axial movement between the stirring probe and the shoulder. Compared with the stirring tool, the gap between the two may be easily enlarged due to wear generated in the sliding portion between the probe support hole of the shoulder and the stirring probe. However, by employing the friction stir tool according to the present invention, it is possible to suppress the adverse effect of the flowing metal on the rotation drive shaft of the stirring probe, without frequently cleaning or replacing the shoulder and the stirring probe. Therefore, it can be said that the present invention is also effective for a double-acting friction stir tool.

  Furthermore, in the above-described embodiment, the case where the workpiece to which the friction stir tool according to the present invention is employed is a metal is described as an example, but the present invention is not limited to this, and the workpiece is not limited thereto. May be a synthetic resin such as plastic. Any material can be used as long as it exhibits plastic flow behavior and can be frictionally stirred.

  In the embodiment described above, the pair of metal members of the shoulder 30 (the friction stir welding tool 10) passes through the fluid discharge hole 37 from the fluid container 36 (expansion container 38) to the fluid metal accumulated in the fluid container 36. The case of discharging to the outside where Wa and Wb are located has been described as an example, but the fluid discharge hole 37 is not necessarily provided.

  This is because if the volume of the fluid container 36 is made sufficiently large, a large amount of fluid metal can be stored in the fluid container 36, and the fluid metal can be discharged outside the shoulder 30 through the fluid discharge hole 37. Even if it is not, it is possible to suppress the flowing metal from flowing into the gap S between the probe support hole 33 of the shoulder 30 and the small diameter cylindrical portion 23 of the stirring probe 20.

  The configuration of the friction stir welding apparatus including the friction stir tool and the friction stir tool according to the present invention is not limited to the configuration of the above-described embodiment.

1 Friction stir welding device 7x Ball screw mechanism (feed mechanism)
9a Rotary drive shaft 10, 10A, 10B Fillet friction stir welding tool (friction stir tool)
20, 20A, 20B Stirring probe 25, 25B, 26 Flow inhibition surface (flow inhibition part)
30, 30A, 30B, 30C Shoulder 33, 33B Probe support hole 36, 36B, 36C Fluid container 37 Fluid discharge hole 38 Expanded container 41, 42 Guide S, S1, S1B Gap Wa, Wb A pair of metal members ( Workpiece)

Claims (9)

A friction stir tool that friction stirs a workpiece,
A stirring probe that stirs the fluid of the workpiece to be softened while rotating and imparting frictional heat while being pressed against the workpiece;
A probe support hole through which the agitation probe passes, and a shoulder that slides on the workpiece while supporting the agitation probe rotating in the probe support hole;
The stirrer probe has a flow inhibition that prevents further flow of the fluid along the axial direction of the stirrer probe when the fluid flows into the gap between the probe support hole of the shoulder and the stirrer probe. A friction stir tool provided with a portion.   The flow inhibition part is a flow inhibition surface that changes or reverses the flow direction of the fluid flowing in from the gap between the probe support hole of the shoulder and the stirring probe from the axial direction of the stirring probe to the radial direction. The friction stir tool according to claim 1.   The friction stirrer tool according to claim 1 or 2, wherein the flow inhibition part is a flow inhibition surface intersecting with an axial direction of the agitation probe.   Between the probe support hole of the shoulder and the agitation probe, there is provided a fluid accommodating part for collecting the fluid that is blocked from further flow along the axial direction of the agitation probe by the flow inhibition part. The friction stir tool according to any one of claims 1 to 3.   The friction stir tool according to claim 4, wherein the shoulder is provided with a fluid discharge hole for discharging the fluid accumulated in the fluid container.   The friction stirrer tool according to claim 4 or 5, wherein the shoulder is provided with an extended accommodating portion for accumulating the fluid in a continuous manner with the fluid accommodating portion.   The combination of the flow inhibition part of the stirring probe, the probe support hole of the shoulder, and the fluid storage part between the stirring probes is provided in a plurality of sets. The friction stir tool described in 1.   The friction stir tool according to claim 5, wherein the shoulder is provided with a guide for guiding the flow of the fluid around the agitation probe in the fluid accommodating portion to guide the fluid to the fluid discharge hole. A friction stir welding apparatus that performs friction stir welding by butting a pair of workpieces,
The friction stir tool according to any one of claims 1 to 8,
A rotary drive shaft that rotates the stirring probe of the friction stirring tool in a state of pressing against the butted portion of the pair of workpieces;
A friction stir welding apparatus provided with a feed mechanism for sliding the shoulder of the friction stir tool supporting the stirring probe rotated by the rotation drive shaft along the butted portions of the pair of workpieces.

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