JP2007313520A - Rotating tool for friction stir spot welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating tool for friction stir spot welding capable of repeatedly performing the smooth friction stir spot welding operation. <P>SOLUTION: The rotating tool 10 for friction stir spot welding comprises a rod-shaped probe 12 which is inserted in a rotating condition from one side of an overlapped portion formed by overlapping a plurality of metallic members to be welded, and a cylindrical shoulder member 14 which is housed around the probe 12 and coaxially located, and has a shoulder surface to be abutted on a surface on the one side under a rotating condition, and has a double-action type structure in which the probe 12 and the shoulder member 14 are constituted separate from each other, and separately movable in the axial direction. First projections 28a-28d for parting material scraps of the metallic members to be welded entering from a space between an inner circumferential surface of the shoulder member 14 and an outer circumferential surface of the probe 12 are provided on the outer circumferential surface of the probe 12, and first discharge holes 30a-30d penetrating a cylindrical wall of the shoulder member 14 are formed therein. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary tool for friction stir spot joining, and in particular, a double-acting device in which a probe and a shoulder member are configured separately and can be rotated around an axis and separately moved in an axial direction. The present invention relates to a friction stir spot welding rotary tool having a formula structure, which can repeatedly perform a smooth friction stir spot joining operation.

  Conventionally, in the automobile manufacturing process, the body member and various parts are integrated by overlapping a plurality of metal plate members and connecting them by point joining such as rivets and resistance spot welding. In addition, the connection method of the metal plate members by such point joining is used in various vehicles including railway vehicles, transportation equipment such as aircraft, and structures of household appliances, building materials, etc. Also widely used in the field of goods.

  On the other hand, in Patent Document 1 and the like, a friction stir welding method is proposed in which metal members are joined using frictional heat as a joining method with less heat input during joining and less degree of softening or distortion. In addition, using such a friction stir welding method, a technique for spot-joining the overlapping portions of a plurality of metal plate members has been studied, thereby, rather than conventional resistance spot welding or joining by rivets, Various friction stir spot welding methods (Friction Stir Spot Welding) have been proposed (see Patent Documents 2 to 5, etc.), because joint quality is good and a good joining state can be stably obtained.

  One of these various friction stir spot joining methods is a method proposed by one of the applicants of the present application, in which the probe and the shoulder member are configured separately and can be moved separately in the axial direction. There is also a method using a rotary tool having a double-acting structure (see Patent Document 5). That is, in this case, the rotating tool having such a structure (double-acting structure) is used, and the rotated probe and shoulder member are inserted (projected) into the overlapping portions of the metal plate members to be joined. The friction stir zone is formed in the overlapped portion by abutting with each other, and the plurality of metal plate members are joined together, and then the shoulder member is advanced while the probe is pulled out from the friction stir zone. The material of the surrounding friction stir zone is caused to flow into the probe hole by pressing the surface, and the probe hole is filled, and when the probe and the shoulder surface of the shoulder member are flush with each other, the rotary tool is A method has been clarified in which it is separated from the superposed portion. Such a previously proposed method is a conventional method using a pin-type tool (rotary tool) having a structure in which a pin-shaped hard probe is integrally provided at the tip of a rod-shaped tool body (Patent Documents 1 to 3). 4)), specifically, when the pin-type tool is pulled out from the friction stir zone (stirring portion) formed at the overlapped portion of the metal plate member after the point joining operation is finished, it takes place there. A recess (hole) with a shape corresponding to the insertion part at the tip of the pin-type tool remains, which causes a problem of liquid accumulation during painting, and increases the joint strength (bonding strength) of the metal plate members to be joined. The problem of causing adverse effects is advantageously eliminated, and even if the thickness of the metal plate members to be joined changes variously, it can be handled with a single rotating tool. It also has the feature of being able to do it.

  However, in the friction stir spot joining method using the rotary tool having the double-acting structure as described above, the rotary tool to be used has a double-acting structure. Clearance (gap) exists, and therefore, there is a problem that the material of the metal member to be joined constituting the friction stir zone (joining portion) enters and adheres to such clearance, and thereby In addition, there has been a problem that it becomes difficult to operate (move) independent of each other between the probe and the shoulder member, and it is impossible to repeatedly perform the friction stir spot joining operation.

  For this reason, the applicants of the present application and the like are another type of friction stir spot joining rotary tool that has a double-acting structure in which the probe and the shoulder member are configured separately and can be moved separately in the axial direction. The gap between the inner circumferential surface of the shoulder member and the outer circumferential surface of the probe is a narrow gap on the distal end side, and an enlarged gap that is a gap larger than the narrow gap on the base side. Further, a discharge hole penetrating the cylindrical wall is formed in the formation part of the enlarged gap in the shoulder member, and the material residue of the metal member to be joined that has entered through the narrow gap can be discharged to the outside through the discharge hole. After carrying out the friction stir spot welding operation on the overlapping portions of the plate-like parts of the plurality of metal members to be joined as the rotary tool for stir spot welding and the friction stir spot joining method using such a rotary tool ,Professional The material of the to-be-joined metal member that has accumulated and adhered to the gap (between the shoulder member and the probe) flowing from the friction stirrer of the overlapped part by repeatedly inserting and removing the sleeve and the shoulder member in the axial direction. A method for promoting the discharge of waste has been proposed (Japanese Patent Application No. 2005-121088).

  However, when the friction stir spot joining operation is repeated and performed using the previously proposed rotary tool for friction stir spot joining, if the number of repetitions is relatively small, the distance between the shoulder member and the probe is Although the material residue of the metal member to be joined that has flowed in from the gap is effectively discharged to the outside of the rotary tool from the discharge hole provided in the shoulder member, the occurrence of the above-described problem can be advantageously suppressed. As the number of repetitions of the joining operation increases, it becomes difficult for the material residue to be discharged to the outside from the discharge hole. As a result, after performing the point joining operation as in the previously proposed friction stir spot joining method, the probe and the shoulder member Is repeatedly moved in the axial direction, and the material waste that has flowed into the gap between the members has to be discharged. Room for good is had been left.

As prior art documents related to the present invention, there are the following.
Japanese Patent No. 2712838 JP 2001-321967 A JP 2001-314983 A JP 2002-120077 A JP 2001-259863 A

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is that the metal material that enters the gap between the probe and the shoulder member is joined by friction stir spot welding. Friction that is effectively discharged to the outside during the operation, and the problem caused by the adhesion of the metal material is advantageously alleviated or avoided, so that the smooth friction stir spot joining operation can be repeated. It is to provide a rotating tool for stirring point joining.

  And in this invention, in order to solve an above-mentioned subject, each plate-like part of a plurality of metal members to be joined is piled up, and it is inserted in a rod shape while being rotated from one side of the superposed part. And a cylindrical shoulder member that is fitted around the probe and is coaxially positioned and has a shoulder surface that is brought into contact with the surface on one side in a rotating state, and The probe and the shoulder member are configured separately, and are made into a rotary tool for friction stir spot joining that exhibits a double-acting structure in which the probe and the shoulder member are separately movable in the axial direction, and on the inner peripheral surface of the shoulder member or the A protrusion is provided on at least one of the outer peripheral surfaces of the probe to divide the material residue of the metal member to be joined that has entered from the gap between the inner peripheral surface of the shoulder member and the outer peripheral surface of the probe. With being Friction agitation characterized in that a discharge hole penetrating the cylindrical wall of the shoulder member is formed, and the material residue divided by the projection can be discharged to the outside of the shoulder member through the discharge hole. The gist of the rotary tool for point joining is as follows.

  In addition, the present invention provides a rod-like probe that is inserted while being rotated from one side of the overlapped portion of each of the plate-like portions of a plurality of metal members to be joined, and is fitted around the probe. A cylindrical shoulder member having a shoulder surface that is positioned coaxially and is brought into contact with the surface on one side in a rotating state, and is coaxially extrapolated to the outer peripheral surface of the shoulder member, and is axially A cylindrical pressing member whose tip surface can be pressed against a surface on one side of the overlapping portion by an urging force to be applied, and the probe and the shoulder member are separated from each other. A friction stir spot joining rotary tool configured to be a body and exhibiting a double-acting structure that is separately movable in the axial direction, at least on the inner peripheral surface of the pressing member or the outer peripheral surface of the shoulder member Either of these Protrusions are provided to divide the material debris of the metal member to be joined that has entered from the gap between the inner peripheral surface of the member and the outer peripheral surface of the shoulder member, and penetrates the cylindrical wall of the pressing member. A rotary tool for joining a friction stir spot, characterized in that a discharge hole is formed, and the material residue divided by the projection can be discharged to the outside of the pressing member through the discharge hole. This is the gist.

  Therefore, in such a friction stir spot joining rotary tool according to the present invention, the probe and the shoulder member have a double-acting structure, and the gap between the probe and the shoulder member is to be joined. Even if metal material (material waste) plastically fluidized flows from the friction stirrer (joint part) formed in the overlapping part formed by superposing the plate-like parts of the metal member, the material residue remains in the shoulder member. The material debris that is advantageously divided during the friction stir spot welding operation by the protrusions provided on at least one of the inner circumferential surface and the outer circumferential surface of the probe, and divided into powder pieces. The metal material accumulates in the gap between the probe and the shoulder member through the discharge hole formed in the shoulder member. Yo Trouble elicited Te effectively suppressed or is to become such that it can be prevented.

  In addition, the operation and effect of the provision of the projection for dividing the material residue and the discharge hole for discharging the separated material residue is that the cylindrical pressing member is outside the shoulder member. In the rotary tool for friction stir spot joining having a double-acting structure to be inserted, a protrusion for dividing the material residue is provided on at least one of the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member. In the case where the discharge hole for discharging the divided material residue is formed so as to penetrate the cylindrical wall of the pressing member, the same effect can be obtained. That is, the plastic fluidized metal material (material residue) flowing in from the gap between the pressing member and the shoulder member can be effectively divided by the protrusions during the friction stir spot joining operation, and The material residue that has been removed can be advantageously discharged to the outside through the discharge hole formed in the pressing member, so that troubles caused by the adhesion of the metal material between the pressing member and the shoulder member can be effectively prevented. It can be mitigated or avoided.

Aspects of the Invention

  By the way, the present invention can be suitably implemented in various modes as listed below in order to solve the above-described problems or problems to be grasped from the description of the entire specification and the drawings. Each aspect described in can be employed in any combination. It should be noted that the aspects or technical features of the present invention are not limited to those described below, and can be recognized based on the description of the entire specification and the inventive concept disclosed in the drawings. Should be understood.

(1) Each plate-like part of a plurality of metal members to be joined is overlapped, and a rod-like probe that is inserted while being rotated from one side of the overlapped part, and is coaxially fitted around the probe. And a cylindrical shoulder member having a shoulder surface that is brought into contact with the surface on one side in a rotating state, and the probe and the shoulder member are configured separately and separately. A friction stir spot welding rotary tool having a double-acting structure that is movable in the axial direction at least on the inner peripheral surface of the shoulder member or on the outer peripheral surface of the probe. A protrusion for separating material debris of the metal member to be joined that has entered from a gap between the inner peripheral surface of the probe and the outer peripheral surface of the probe is provided, and discharge that penetrates the cylindrical wall of the shoulder member A hole is formed Through exhaust Deana, friction stir spot joining rotary tool, characterized in that as cutting material debris can be discharged to the outside of the shoulder member by said projections.

(2) A cylindrical pressing member is coaxially inserted on the outer peripheral surface of the shoulder member, and the leading end surface of the pressing member is made to overlap with the urging force exerted in the axial direction of the pressing member. And the inner peripheral surface of the pressing member on at least one of the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member. Protrusions are provided for separating the material residue of the metal member to be joined that has entered from the gap between the outer peripheral surface of the shoulder member, and a discharge hole penetrating the cylindrical wall of the pressing member is formed. The friction stir spot joining rotary tool according to the above aspect (1), wherein the material residue divided by the projection can be discharged to the outside of the pressing member through the discharge hole.
Thus, in the double-acting friction stir spot welding rotary tool composed of the probe, the shoulder member, and the pressing member, not only at least one of the inner surface of the shoulder member and the outer surface of the probe. Further, at least one of the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member is provided with a projection for dividing the material residue of the joining metal member that has entered the gap between the members, and further, the shoulder member Further, by forming discharge holes penetrating the respective cylinder walls in the pressing member, it is more advantageous to cause troubles due to adhesion of the metal material between the members (between the probe and the shoulder member and between the shoulder member and the pressing member). Can be avoided.

(3) Each plate-like part of a plurality of metal members to be joined is superposed, and a rod-like probe that is inserted while being rotated from one side of the overlapped part, and is coaxially fitted around the probe. And a cylindrical shoulder member having a shoulder surface that is brought into contact with the surface on one side in a rotating state, and is coaxially extrapolated to the outer peripheral surface of the shoulder member to act in the axial direction. A cylindrical pressing member whose tip surface can be pressed against a surface on one side of the overlapping portion by an urging force, and the probe and the shoulder member are configured separately. And a friction stir spot joining rotary tool having a double-acting structure that is separately movable in the axial direction, and at least one of the inner surface of the pressing member and the outer surface of the shoulder member. Of the pressing member A discharge hole that divides the material residue of the metal member to be joined that has entered from the gap between the peripheral surface and the outer peripheral surface of the shoulder member, and that passes through the cylindrical wall of the pressing member. A rotary tool for joining a friction stir spot, wherein the material residue divided by the protrusion can be discharged to the outside of the pressing member through the discharge hole.

(4) The friction stir spot welding rotary tool according to the aspect (3), wherein the shoulder member is formed with a discharge hole penetrating the cylindrical wall.
Such an embodiment can be advantageously employed when the amount of metal material flowing between the probe and the shoulder member is relatively small.

(5) The gap between the inner peripheral surface of the shoulder member and the outer peripheral surface of the probe is a narrow gap on the distal end side, while the enlarged gap is a gap larger than the narrow gap on the base side. Further, in the above aspects (1) to (4), a discharge hole penetrating the cylindrical wall of the shoulder member is formed at a portion where the enlarged gap is formed in the shoulder member. The rotary tool for friction stir spot welding according to any one of the above.
As in this aspect, the gap between the inner peripheral surface of the shoulder member and the outer peripheral surface of the probe employs a configuration in which a narrow gap and an enlarged gap are combined. By providing the discharge hole, the plastic fluidized metal material flowing into the friction stirrer (joint) into the gap between the inner peripheral surface of the shoulder member and the outer peripheral surface of the probe is effective. Even if the metal material once flows in, the metal material that has flowed in is advantageously guided to the enlarged gap due to the presence of the enlarged gap located in the back (base side) of the narrow gap. Then, the material is effectively divided by protrusions provided on at least one of the inner peripheral surface of the shoulder member and the outer peripheral surface of the probe to form a fine material residue, and then the exhaust provided on the shoulder member From where the it can be discharged to the outside through holes, the accumulation of metallic material in the gap between the shoulder member and the probe can be more advantageously suppressed or is blocked.

(6) While the gap between the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member is a narrow gap on the distal end side, the enlargement becomes a gap larger than the narrow gap on the base side. The above-described aspects (2) to (5), characterized in that the gap is a gap, and further, a discharge hole penetrating the cylindrical wall of the pressing member is formed at a portion where the enlarged gap is formed in the pressing member. The rotary tool for friction stir spot welding according to any one of the above.
In this aspect, similarly to the above-described aspect (5), the plastic fluidized metal material of the friction stirrer flows into the gap between the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member. Even if the metal material flows into the gap while being effectively suppressed, the metal material is effective due to the protrusions provided on at least one of the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member. The material residue can be discharged to the outside through a discharge hole provided in the pressing member, and thus the metal material in the gap between the pressing member and the shoulder member. Can be more advantageously suppressed or prevented.

(7) The discharge hole penetrating the cylindrical wall of the shoulder member is formed to be inclined toward the shoulder surface side from the outer peripheral surface side to the inner peripheral surface side of the shoulder member. The rotary tool for friction stir spot welding according to any one of aspects (1), (2), and (4) to (6).

(8) The discharge hole penetrating the cylindrical wall of the pressing member is formed to be inclined toward the tip surface side from the outer peripheral surface side to the inner peripheral surface side of the pressing member. The rotating tool for friction stir spot welding according to any one of aspects (2) to (7).

  As in the above aspects (7) and (8), the discharge hole for discharging the fine material residue to the outside is directed toward the inner peripheral surface side from the outer peripheral surface side of the shoulder member (pressing member). By forming it inclined to the side (tip surface side), the material residue can be discharged to the outside more effectively.

(9) The discharge hole penetrating the cylindrical wall of the shoulder member extends in a direction different from the direction toward the central axis from the outer peripheral surface side to the inner peripheral surface side of the shoulder member. The friction stir spot welding rotary tool according to any one of the above aspects (1), (2), (4) to (8).

(10) The discharge hole penetrating the cylindrical wall of the pressing member extends in a direction different from the direction toward the central axis from the outer peripheral surface side to the inner peripheral surface side of the pressing member. The friction stir spot welding rotary tool according to any one of the above aspects (2) to (9).

  As in the embodiments of (9) and (10), the discharge hole for discharging the fine material residue to the outside is the central axis from the outer peripheral surface side of the shoulder member (pressing member) toward the inner peripheral surface side. By forming it so as to extend in a direction different from the direction toward, the material waste can be discharged to the outside more effectively.

(11) A friction stir spot welding device including the rotary tool for friction stir spot welding according to any one of the above aspects (1) to (10).

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each of the following drawings, in order to facilitate understanding of the characteristic part of the present invention, a gap between each member (between the probe 12 and the shoulder member 14, between the shoulder member 14 and the pressing member 16) and each member ( The protrusions and the like provided on the probe 12 and the shoulder member 14) are exaggerated.

  First, FIG. 1 schematically shows an example of a friction stir spot welding rotary tool according to the present invention, and FIG. 2 shows the tip of the friction stir spot welding rotary tool shown in FIG. The part is shown enlarged. In these figures, a friction stir spot joining rotary tool (hereinafter referred to as a rotary tool as appropriate) 10 includes a rod-shaped probe 12 and a cylindrical shoulder member 14 and a flange for mounting on the base side (upper side in the figure). The cylindrical pressing member 16 having a portion is coaxial with the probe 12 centered on the outside of the shoulder member 14 on the outer side of the probe 12 and further on the outer side of the shoulder member 14. It is comprised in the structure formed by.

  Specifically, the probe 12 includes a round rod-like probe tip 12a having a long and narrow diameter (generally about 3 to 7 mm) on the lower side in the figure, and a diameter larger than the probe tip 12a. It has a structure in which a base-side round bar-like probe base 12b is integrally formed, and is arranged so as to be positioned at the center of the rotary tool 10. As in the prior art, the probe 12 can be rotated around its axis at a high speed by a rotary drive device (not shown) connected to the probe base 12b side, and reciprocates in the axial direction. Movement (protruding movement + pull-in operation) is possible.

  Further, even in the shoulder member 14, it is a small-diameter thin cylindrical shoulder tip portion 14a (outer diameter: about 8 to 12 mm) extending in the axial direction at a length slightly shorter than the probe tip portion 12a, and so on. It is integrally formed from a shoulder base portion 14b located on the base side, which is larger in diameter and thicker than the shoulder tip portion 14a, and is extrapolated to the probe 12. As with the probe 12, the shoulder member 14 can be rotated around an axis at a high speed in synchronism with the probe 12 or separately from the probe 12 by a rotation driving device (not shown). In the axial direction, reciprocating motion (protruding motion + retraction operation) is possible. Further, the front end surface of the shoulder front end portion 14a that is in contact with or pressed against the metal member to be bonded is a shoulder surface 14c. Then, at least a portion of the shoulder tip 14a of the shoulder member 14 that is in contact with the metal member to be joined together with at least a portion of the probe tip 12a of the probe 12 that is in contact with the metal member to be joined is used. For example, when the metal member to be joined is an aluminum material, it is formed of a steel material.

  Furthermore, the pressing member 16 has a burr pressing function, and has a small-diameter thin cylindrical pressing tip 16a (outer diameter) extending in the axial direction at a length slightly shorter than the length of the shoulder tip 14a of the shoulder member 14. : About 12 to 20 mm) and a large-diameter thick flange-shaped pressing base portion 16b located on the base side. Such a pressing member 16 can move within a range restricted in the axial direction by stays 20 positioned at a plurality of locations in the circumferential direction with respect to the holding member 18 provided at a fixed position. In addition, since the compression coil spring 22 is disposed between the pressing member 16 and the holding member 18 in the state of being inserted through the stay 20, the pressing member 16 is shown in FIG. When it is moved upward in the axial direction from the state shown, a downward biasing force can be generated. Note that, unlike the probe 12 and the shoulder member 14, the pressing member 16 is not rotated during the friction stir spot joining operation described later, and can hold a stationary state.

  As shown in FIG. 1, the shoulder member 14 is inserted and disposed in the inner hole of the pressing member 16, and the probe 12 is inserted and disposed in the inner hole of the shoulder member 14. , 14, 16) are arranged coaxially.

  By the way, in general, in the friction stir spot joining rotary tool having the double-acting structure as described above, in order to allow the probe and shoulder member to move in the axial direction and rotate around the axis, the probe and shoulder member are used. And a clearance (gap) is inevitably formed between the shoulder member and the pressing member. In the friction stir spot joining rotary tool 10 according to the present invention, Such a gap structure is adopted.

  That is, as shown in an enlarged view in FIG. 2, the outer peripheral surface of the probe distal end portion 12 a of the probe 12 and the inner peripheral surface of the shoulder distal end portion 14 a of the shoulder member 14 are located at the distal end portion of the rotary tool 10. The narrow gap 24a is defined as a narrow gap 24a on the distal end side, and an enlarged gap 24b is defined as a gap larger than the narrow gap 24a on the base side. Further, in the gap between the outer peripheral surface of the shoulder tip portion 14a of the shoulder member 14 and the inner peripheral surface of the pressing tip portion 16a of the pressing member 16, the tip side is a narrow gap 26a. Is an enlarged gap 26b which is a gap larger than such a narrow gap 26a. Here, the two enlarged gaps 24b and 26b, which are gaps with a large clearance, are, here, the inner peripheral surface of the shoulder tip 14a of the shoulder member 14 and the inner peripheral surface of the pressing tip 16a of the pressing member 16, respectively. By being formed as a stepped surface having a larger diameter on the base side than on the distal end side, it is formed between the outer peripheral surface of the probe distal end portion 12a of the probe 12 and the outer periphery of the shoulder distal end portion 14a of the shoulder member 14. Each is formed between the surfaces.

  In the rotary tool 10 having such a predetermined gap structure at the tip, the material of the friction stirrer formed on the metal member to be joined by the narrow gaps 24a and 26a is used as the probe tip 12a and the shoulder tip 14a. Even if the material enters through the narrow gaps 24a and 26b while preventing the gap between the gap and the gap between the shoulder tip 14a and the pressing tip 16a, the large clearance located on the base side In this case, the introduced material is effectively divided during the friction stir spot joining operation and discharged to the outside through the discharge hole. Therefore, the outer material of the probe tip 12a, the inner surface of the shoulder tip 14a, and the And the outer peripheral surface and the outer peripheral surface of the pressing tip 16a of the holder tip 14a is effectively prevented to be caused to fixed over the entire peripheral surface and thus capable of being suppressed. As a result, even if the friction stir spot joining operation is repeatedly performed, smooth rotation and reciprocation of the probe 12 and the shoulder member 14 are ensured. In addition, even if the narrow gaps 24a and 26a are fixed, the fixing regions can be controlled by appropriately selecting the axial lengths of the narrow gaps 24a and 26a. By reducing the rotation speed of the probe 12 and the shoulder member 14 during the friction stir spot joining operation and by making the rotational speeds of the probe 12 and the shoulder member 14 different from each other without requiring force, such a narrowness is achieved. This makes it possible to avoid sticking in the gaps 24a and 26a.

  The narrow gaps 24a and 26a are provided in such an axial length that the occurrence of troubles due to the adhering material that flows in can be avoided according to the size of the clearance. The axial lengths x and y are generally about 0.1 to 5 mm, preferably about 1 to 4 mm. This is because when the axial lengths x and y are too short, it becomes difficult to form them, and when they are too long, the members are made of materials that have entered the narrow gaps 24a and 26a. This is because there is a high possibility that malfunctions may occur due to adhesion between the two. In FIG. 2, the axial length y of the narrow gap 26a between the outer peripheral surface of the shoulder tip portion 14a and the inner peripheral surface of the press tip portion 16a is the axial direction of the small diameter portion at the tip of the press tip portion 16a. Although it is defined as a length, this is because the front end surface of the pressing front end portion 16a and the shoulder surface 14c which is the front end surface of the shoulder front end portion 14a are flush with each other during the friction stir spot joining operation. .

  The clearance between the narrow gaps 24a and 26a is preferably as small as possible so that the material that plastically flows in the friction stirrer can be suppressed. It is desirable that the gap be about 0.5 to 0.5 mm, preferably about 0.1 to 0.4 mm. This is because if the clearances of the narrow gaps 24a and 26a are increased, the amount of the material entering the gaps increases, so that troubles such as sticking are easily caused.

  Further, the enlarged gaps 24b and 26b are provided on the base side of the rotary tool 10 with respect to the narrow gaps 24a and 26a, respectively, so as to give a gap larger than the clearance of the narrow gaps 24a and 26a. The material entering from the narrow gaps 24a and 26a is accommodated, and further, as will be described later, the material flowing in by the protrusions provided therein is effectively divided. In order to realize it advantageously, the clearance is advantageously 0.5 mm or more, preferably 1 mm or more. As is apparent from FIGS. 1 and 2, from the small diameter portions on the surfaces from the narrow gaps 24a and 26a to the enlarged gaps 24b and 26b, that is, the inner peripheral surface of the shoulder tip 14a and the inner peripheral surface of the pressing tip 16a. The surface that transitions to the large-diameter portion is an inclined surface, and the material that has entered the narrow gaps 24a and 26a can be smoothly guided into the enlarged gaps 24b and 26b. As shown in FIG. 1, the enlarged gaps 24b and 26b are formed on the rotary tool 10 by the tapered inner peripheral surface that continues from the shoulder tip 14a to the shoulder base 14b and the stepped surface that continues from the pressing tip 16a to the pressing base 16b, respectively. It is extended as a large-diameter gap toward the base side.

  And in the rotary tool 10 according to this invention, it has the following structures in the front-end | tip part of each member, as expanded and shown by FIG. 2 thru | or FIG. 4 with the clearance gap structure as mentioned above. It is. That is, first, in the probe distal end portion 12a, the four first protrusions 28a to 28a projecting outward (to the shoulder member 14 side) at a position separated from the distal end surface on the outer circumferential surface by a predetermined distance in the axial direction. 28d is provided [see FIG. 2 and FIG. 3], and the shoulder tip 14a is provided at the probe tip 12a on the inner peripheral surface so as to correspond to the first protrusions 28a to 28d. First discharge holes 30a to 30d are provided slightly above the first protrusions 28a to 28d (on the shoulder base 14b side) [see FIGS. 2 and 3]. Further, the shoulder tip portion 14a is outwardly (pressed) on a portion that is separated from the shoulder surface 14c on the outer circumferential surface by a predetermined distance in the axial direction and a portion that is further away from the portion (base side) by a predetermined distance. Projections (lower second projections 32a to 32d, upper second projections 34a to 34d) projecting toward the member 16 side are provided, and the shoulder tip portion 14a is provided at the pressing tip portion 16a. The discharge holes (lower second discharge holes 36a to 36d, upper second discharge holes 38a to 38d) corresponding to the protrusions (32a to 32d, 34a to 34d) provided on the inner periphery of the pressing tip 16a It is provided corresponding to each protrusion (32a to 32d, 34a to 34d) formed on the surface [see FIGS. 2 and 4]. Since the upper second protrusions 34a to 34d have the same cross-sectional shape as the lower second protrusions 32a to 32d, a cross sectional explanatory view of the upper second protrusions 34a to 34d. Is omitted.

  More specifically, the first protrusions 28a to 28d of the probe tip 12a, the lower second protrusions 32a to 32d and the upper second protrusions 34a to 34d of the shoulder tip 14a are all probes. On the outer peripheral surface of the tip portion 12a or the shoulder tip portion 14a, it is formed at equal intervals in the circumferential direction, and the upper (base side) side surface of each projection is a horizontal plane, while the lower side (tip) The side surfaces of the surface side and the shoulder surface 14c side are inclined surfaces that are inclined upward from the probe distal end portion 12a or the shoulder distal end portion 14a toward the outside (the shoulder distal end portion 14a side or the pressing distal end portion 16a side). In addition, the narrow gap 24a described above is provided between the outer side surface (the shoulder tip portion 14a side or the pressing tip portion 16a side) of each of the protrusions and the inner peripheral surface of the shoulder tip portion 14a or the pressing tip portion 16a. A clearance (clearance) similar to that of 26a is formed.

  Further, the first discharge holes 30a to 30d penetrating the cylindrical wall of the shoulder tip 14a and the cylinder of the pressing tip 16a corresponding to each of the projections (28a to 28d, 32a to 32d, 34a to 34d). Each of the lower second discharge holes 36a to 36d and the upper second discharge holes 38a to 38d penetrating the wall is a perfect circular hole, and similarly to the above-described protrusion, the shoulder tip portion 14a or the pressing portion They are formed at equal intervals in the circumferential direction of the tip portion 16a.

  In such a friction stir spot welding rotary tool 10, the metal material of the friction stirrer formed on the metal members to be joined is subjected to the probe tip 12 a and the shoulder tip 14 a during the friction stir spot welding operation. For the material that has entered the gap between the probe tip 12a and the shoulder tip 14a even if it enters the gap between the shoulder tip 14a and the pressing tip 16a, the probe tip 12a Similarly, the lower second protrusion that rotates in the same manner as the shoulder tip portion 14a by the first protrusions 28a to 28d rotating in the same manner and the material that has entered the gap between the shoulder tip portion 14a and the pressing tip portion 16a. It is effectively divided by the objects 32a to 32d and the upper second protrusions 34a to 34d, respectively. Tsu metallic material, each discharge hole provided in the shoulder tip 14a or the pressing tip 16a (30 a to 30 d, 36 a to 36 d, 38 a to 38 d) is discharged to the outside of the rotary tool 10 through. As a result, the outer peripheral surface of the probe tip portion 12a and the inner peripheral surface of the shoulder tip portion 14a are not fixed by the metal material that has entered, and similarly, the outer peripheral surface of the shoulder tip portion 14a and the pressing tip portion. Adherence with the inner peripheral surface of 16a can be effectively avoided or suppressed, and therefore, the rotational operation and reciprocating motion of the probe 12 and the shoulder member 14 are advantageously ensured, and the friction stir for a long time. The point joining operation can be carried out if possible.

  Here, for the protrusions according to the present invention, the number of arrangement, the arrangement position, etc., according to the various conditions in the friction stir spot welding operation, the type of the metal member to be joined, the thickness, etc. It is determined appropriately. That is, in order to effectively divide the metal material flowing into the gaps between the members, one protrusion is provided on each of the probe 12 (probe tip 12a) and / or the shoulder member 14 (shoulder tip 14a). A plurality of protrusions are provided at a predetermined position on the outer peripheral surface of the member, or on the outer peripheral surface of these members with an arbitrary distance in the circumferential direction and / or the axial direction.

  In addition, even in the discharge hole of the present invention, in the same manner as the above-described projection, considering various conditions in the friction stir spot joining operation, the material residue separated by the projection is advantageously discharged to the outside. The number and position of the arrangement are determined so that one discharge hole is a predetermined position of the shoulder member 14 (shoulder tip 14a) and / or the pressing member 16 (pressing tip 16a). Alternatively, a plurality of discharge holes are provided at positions separated by an arbitrary distance in the circumferential direction and / or the axial direction of these members. In addition, such a discharge hole should just exhibit the shape which can discharge | emit the material residue divided | segmented by the protrusion advantageously outside, for example, it extends in the axial direction of a perfect circle hole or each member. A hole or the like having an oval shape (a shape in which corresponding ends of two parallel straight lines are connected by a semicircular line segment) is employed. Specifically, a round hole having a diameter of about 1 to 5 mm, or an oval hole having an axial length of about 2 to 30 mm and a width of about 1 to 5 mm is provided at the shoulder tip 14a. And / or provided at the pressing tip 16a.

  With respect to the projections and discharge holes of the present invention, for example, as shown in FIGS. 1 to 4, a gap structure composed of narrow gaps 24a and 26a and enlarged gaps 24b and 26b is adopted at the tip thereof. In the rotary tool 10, the protrusions and the discharge holes are provided at the enlarged gap forming portions of the respective members. More specifically, (1) The first projections 28a to 28d of the probe tip 12a are about 9 to 15 mm from the tip surface (the distance from the tip surface to the center of the width in the vertical direction of the projection. (2) In the shoulder tip portion 14a, (2-1) the first discharge holes 30a to 30d are arranged at the center (in the opening portion on the inner peripheral surface side). The center in the vertical direction (the same applies to the following discharge holes) is about 10 to 16 mm from the shoulder surface 14c (the distance from the shoulder surface (tip surface) to the center in the vertical direction in the opening on the inner peripheral surface side. (2-2) Lower second protrusions 32a to 32d are positioned at a position approximately 5 to 9 mm away from the shoulder surface 14c. (2-3) Upper second protrusion The objects 34a to 34d are the lower second It is provided at a position about 8 to 12 mm away from the center of the artifacts 32a to 32d in the axial direction, respectively. (3) At the pressing tip 16a, (3-1) the lower second discharge holes 36a to 36d Is a position about 6 to 10 mm away from the tip surface, and (3-2) the upper second discharge holes 38a to 38d are positions about 8 to 12 mm away from the center of the lower second discharge holes 36a to 36d in the axial direction. Are provided respectively.

  By the way, when the friction stir spot joining operation is performed on the overlapping portions of the plate-like portions of the plurality of metal members to be joined using the rotary tool 10 for friction stir spot joining according to the present invention, for example, FIG. 5 and according to the steps shown in FIG.

  Incidentally, in FIG. 5 and FIG. 6, on the backing jig 40, the two metal plates 42 and 44 constituting the plate-like portion of the metal member to be joined to be joined by the friction stir spot are overlapped in the vertical direction. They are placed together and clamped to a fixed position as before. The two metal plates 42 and 44 are both made of a metal material capable of friction stir welding, and are made of, for example, aluminum, aluminum alloy, copper, copper alloy, iron, or an alloy thereof. In addition, for the metal plates 42, 44, the same material or different materials are appropriately selected.

  At the start of the friction stir spot joining operation, as shown in FIG. 5 (a), the tip of the rotary tool 10 is positioned above the overlapping portions of the metal plates 42 and 44. The probe 12 (probe tip 12a) and the shoulder member 14 (shoulder tip 14a) are both rotated at high speed, and the tip of the rotary tool 10 is lowered in this state. Next, when the pressing member 16 (pressing tip portion 16a) is further pressed after contacting the upper metal plate 42 at the leading end surface, the pressing member 16 becomes compressed coil spring 22 [see FIG. The probe 12 and the shoulder member 14 are retreated (raised) against the urging force of FIG. 5 and are flush with the tip surfaces of the probe 12 and the shoulder member 14 [see FIG. 5B]. When the leading end surface of the metal plate is brought into contact with or pressed against the overlapping portion, frictional heat is generated from the metal plate 42 side. Further, in the state where the metal plate 42 is softened by the frictional heat generation, the probe 12 is inserted as shown in FIG. 5C, and the frictional heat generation action by the probe 12 is added, so that the two sheets While the friction stirrer 46 straddling the metal plates 42 and 44 is formed, the shoulder member 14 is retracted, and the material of the friction stirrer 46 surplus due to the insertion (protrusion) of the probe 12 is the shoulder member 14. It is absorbed in the space formed by the receding. In this way, by disposing the pressing member 16 outside the shoulder member 14 and pressing the surface of the metal plate 42 serving as the outer peripheral portion of the friction stirrer 46, the material is absorbed by the retraction of the shoulder member 14. Thus, the generation of burrs can be performed more effectively.

  Next, when the probe 12 is retracted from the state shown in FIG. 5C, the so-called probe hole 48 from which the probe 12 has been removed remains in the friction stirrer 46 as shown in FIG. 6A. Thus, simultaneously with the backward movement of the probe 12 or after the backward movement, the shoulder member 14 is advanced (lowered), and the upper surface of the friction stirrer 46 is pressed by the shoulder surface 14c which is the front end surface of the shoulder member 14. Then, the material of the surrounding friction stirrer 46 is caused to flow into the probe hole 48 to fill the probe hole 48 as shown in FIG. 6 (b), and then disappear, as shown in FIG. 6 (c). When the rotary tool 10 is retracted upward, the two overlapping metal plates 42 and 44 are effectively joined by the joint provided by the friction stirrer 46 where the probe hole 48 does not exist. With degrees, it become as being brought firmly bonded.

  In such a friction stir spot joining method, when the rotary tool 10 of the present invention is used, the tip surfaces of the probe 12 (probe tip portion 12a) and the shoulder member 14 (shoulder tip portion 14a) come into contact with the metal plate 42. During the period from the beginning to the end [see FIG. 5 (b) to FIG. 6 (b)], a part of the material of the friction stirrer 36 formed across the metal plates 42 and 44 is contained in the probe tip 12a. Even if it enters the gap between the peripheral surface and the outer peripheral surface of the shoulder tip portion 14a, it is effectively divided by the first protrusions 28a to 28d provided on the rotating probe tip portion 12a. The material waste made into pieces includes first discharge holes 30a to 30d penetrating the cylindrical wall of the shoulder tip portion 14a, lower second discharge holes 36a to 36d penetrating the cylindrical wall of the pressing tip portion 16a, and upper first two The material is discharged to the outside through the outlet holes 38a to 38d, and is rotated even in the material flowing into the gap between the outer peripheral surface of the shoulder tip 14a and the inner peripheral surface of the pressing tip 16a. The lower second projections 32a to 32d and the upper second projections 34a to 34d provided on the shoulder tip 14a are divided into powder pieces to form the lower second discharge holes 36a to 36a to the pressing tip 16a. 36d and the upper second discharge holes 38a to 38d are discharged to the outside. As described above, in the rotary tool 10 of the present invention, the material enters the gap between the probe tip portion 12a and the shoulder tip portion 14a and the gap between the shoulder tip portion 14a and the pressing tip portion 16a. This problem can be advantageously suppressed or eliminated without requiring any step different from the general friction stir welding operation.

  The friction stir spot joining method described above is merely one example, and the friction stir spot joining rotary tool according to the present invention can be employed in various conventionally known methods. Of course, as a modification of the illustrated method, instead of the step of FIG. 5B, only the probe 12 is protruded (the shoulder member 14 does not abut against the metal plate 42, and a predetermined space therebetween). It is also possible to cause the frictional heat to be generated by the contact of the probe 12, soften the metal plate 42, and insert as shown in FIG. 5C to form the friction stirrer 46. Thus, it is possible to more effectively prevent the occurrence of trouble due to the fixation between the shoulder member 14 and the pressing member 16. Further, when the rotary tool 10 is pulled away as shown in FIG. 6C from the state shown in FIG. 6B in which the filling of the probe hole 48 is completed, the probe 12 is slightly protruded in the state shown in FIG. 6B. (Lowering in the figure), the adhesion between the shoulder member 14 and the workpieces (42, 44) and the adhesion between the pressing member 16 and the workpieces (42, 44) are peeled off successfully. The whole can be effectively separated, and is a method advantageously employed in the present invention.

  The exemplary embodiments of the present invention have been described in detail above. However, the embodiments are merely examples, and the present invention is limited in any way by specific descriptions according to such embodiments. It should be understood that it is not interpreted. In the rotary tool 52 [see FIGS. 7 to 9] and the rotary tool 60 [see FIG. 10] described below, the same parts as those of the rotary tool 10 shown in FIGS. A detailed description will be omitted.

  For example, in the embodiment described above, the first discharge holes 30a to 30d in the shoulder member 14 (shoulder tip portion 14a) of the rotary tool 10 and the lower second discharge hole 36a in the pressing member 16 (pressing tip portion 16a). -36d and the upper second discharge holes 38a-38d are all formed so as to extend in the horizontal direction (left-right direction in the drawing) toward the respective central axes (rotating shafts). The discharge hole is not limited to such a form, and can be provided in the form shown in FIGS.

  That is, FIG. 7 shows an enlarged front end portion of the rotary tool 52 for friction stir spot welding according to another embodiment of the present invention, where the first discharge hole 54a in the shoulder front end portion 14a is shown. To 54d and the lower second discharge holes 56a to 56d and the upper second discharge holes 58a to 58d in the pressing tip portion 16a are respectively formed from the outer peripheral surface side of the member (shoulder tip portion 14a, pressing tip portion 16a). It is formed so as to be inclined toward the distal end surface side toward the peripheral surface side [see FIG. 7] and to extend in a direction different from the direction toward the central axis [see FIGS. 8 and 9]. By providing the discharge hole in such a form, the material residue divided by the projections (28a to 28d, 32a to 32d, 34a to 34d) can be discharged more effectively to the outside of the rotary tool 52. It is. In the present invention, the discharge hole extends from the outer peripheral surface side to the inner peripheral surface side of each member 1) so as to extend in the horizontal direction and in a direction different from the central axis of each member, or 2) It is of course possible to incline toward the front end surface side of each member and provide them toward the central axis, and of course, to provide different types of discharge holes in the pressing member and shoulder member. It is.

  Further, the protrusion in the present invention is not limited to the shape shown in the above-described embodiment, and the probe 12 (probe tip portion 12a) like the rotary tool 60 shown in FIG. It is also possible to form the threaded portion 62 on the outer peripheral surface of the threaded portion and use the threaded portion of the threaded portion 62 as the projection of the present invention.

  Furthermore, in each of the above-described embodiments, protrusions are formed on the outer peripheral surface of the probe tip portion 12a and the outer peripheral surface of the shoulder tip portion 14a. Along with or in place of such a protrusion, a protrusion from the inner peripheral surface of the shoulder tip 14a toward the outer peripheral surface of the probe tip 12a, or a shoulder tip from the inner peripheral surface of the pressing tip 16a It is also possible to provide a protrusion toward the outer peripheral surface of the portion 14a.

  Further, in the above-described embodiment, any rotary tool has a structure in which the pressing member 16 is extrapolated outside the shoulder member 14, thereby effectively generating burrs during friction stir spot joining. Although suppressed, such a pressing member 16 is not essential in the present invention.

  In addition, in the above-described embodiments, the present invention is applied to the gap between the shoulder member 14 and the pressing member 16 as well as the gap between the probe 12 and the shoulder member 14, and flows in. And a discharge hole for discharging the material residue that has become a powdery piece by the division, the present invention is applied only in any one of the gaps ( It is also possible to provide a protrusion and a discharge hole. For example, in a rotary tool including a probe, a shoulder member, and a pressing member, when there is little inflow of material between the probe and the shoulder member, the outer peripheral surface of the probe (and the inner peripheral surface of the shoulder member) Without providing a protrusion, the shoulder member is divided into (1-1) a discharge hole for discharging the material flowing between the probe and the shoulder member, and (1-2) the material flowing between the shoulder member and the pressing member is divided. It is also possible to advantageously provide a discharge hole for discharging the material residue divided by the protrusion provided on the shoulder member to the outside. .

  Furthermore, in the illustrated specific example, the present invention is described in an example in which the metal plates 32 and 34 that are plate materials are used as the metal members to be joined by friction stir spot bonding [FIG. The shape of such a metal member to be joined is not limited to the plate material, and the overlapping portions subjected to the friction stir spot joining operation are each plate-shaped or face-plate-shaped. As long as it is, any member can be adopted.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. Needless to say, all of these are within the scope of the present invention without departing from the spirit of the present invention.

  Hereinafter, representative examples of the present invention will be shown to clarify the present invention more specifically, but the present invention is not limited by the description of such examples. It goes without saying.

-Experimental Example 1-
First, two sheets of a 6000 series aluminum plate (6016-T4) having a thickness of 1 mm and a rotary tool 10 having a double-acting structure shown in FIGS. 1 to 4 were prepared as metal members to be joined. Here, in the rotary tool 10, the axial lengths x and y of the narrow gaps 24a and 26a are each 5 mm, and (1) the first protrusions 28a to 28d are arranged at the probe tip. 12 mm from the front end surface of the portion 12a (distance from the front end surface to the center in the vertical direction of the projection. The same applies to the following projections) and (2) at the shoulder front end portion 14a, (2- 1) The first discharge holes 30a to 30d are 13 mm away from the shoulder tip surface 14c (distance from the tip surface to the center of the discharge hole. The same applies to the following discharge holes). (2-2) Lower side The second protrusions 32a to 32d are at a position 7 mm away from the shoulder tip surface 14c, and (2-3) the upper second protrusions 34a to 34d are 17 mm from the shoulder tip surface 14c (lower second protrusions 32a to 32d). of Further, (3) In the pressing tip portion 16a, (3-1) the lower second discharge holes 36a to 36d are separated from the tip surface of the pressing tip portion 16a. (3-2) The upper second discharge holes 38a to 38d are provided at positions separated by 8 mm (10 mm from the center of the lower second discharge holes 32a to 32d), respectively. . The discharge holes (30a to 30d, 36a to 36d, 38a to 38d) have a perfect circle shape, and the size (hole diameter) is 5 mm.

  Next, the friction stir spot joining operation was performed as shown in FIGS. 5 and 6 in a state where the two aluminum plates were superposed and the backing jig 30 was in contact with the lower plate side. . Specifically, after the pressing member 16 of the rotary tool 10 is abutted from the upper plate side, the probe 12 and the shoulder member 14 are abutted so that they are flush with each other while rotating at a high speed of 1500 rpm. Then, the probe 12 is protruded so as to be inserted into the lower plate by 0.2 mm to form the friction stirrer 46, and when the probe 12 is pulled out thereafter, the shoulder member 14 is set to 0 with respect to the upper plate. The two aluminum plates were joined so that the probe hole 48 was buried by pushing in 1 mm so that the probe hole 48 did not remain on the surface of the joint 50.

  As a result, since the pressing member 16 suppressed the generation of burrs on the outer periphery of the shoulder member 14, friction stir spot joining without generation of burrs was realized. Further, the joint portion 50 was a surface with an unevenness of 0.05 mm or less, and was recognized as a substantially flat surface, and the back surface was also substantially flat and healthy.

  And when such a friction stir spot joining operation is continued and 300 times of spot joining consisting of repeating 300 times is attempted, sound spot joining is performed without stopping until the end. I was able to do it. Further, after carrying out such point joining, when the tip of the rotary tool 10 is disassembled, aluminum is found in the gap between the probe 12 and the shoulder member 14 and the gap between the shoulder member 14 and the pressing member 16. Adhesion of (material) was not recognized, and it was confirmed that the aluminum (material) flowing into the gaps was effectively discharged to the outside of the rotary tool 10 during the point joining operation.

-Experimental example 2-
Unlike the experimental example 1, as the rotary tool, the enlarged gaps 24b and 26b are not provided (therefore, only clearances of the narrow gaps 24a and 26a are provided), and protrusions (28a to 28d, 32a to 32d, 34a to 34d) are not provided, and furthermore, in the same manner as in Experimental Example 1 except that a rotary tool not provided with discharge holes (30a to 30d, 36a to 36d, 38a to 38d) is used, 2 When the friction stir spot joining operation was performed on the overlapped portion of a single aluminum plate material, aluminum adhesion was severe at 15 consecutive striking points, the load of inserting and removing the rotary tool increased, the limiter worked, and the device Stopped.

It is longitudinal cross-sectional explanatory drawing which shows an example of the rotary tool for friction stir spot joining according to this invention. It is explanatory drawing which expands and shows the front-end | tip part of the rotary tool shown by FIG. It is AA cross-section explanatory drawing in FIG. FIG. 3 is a cross-sectional explanatory view taken along line BB in FIG. 2. It is process explanatory drawing which shows the process of the first half of the friction stir spot joining method using the rotary tool according to this invention, Comprising: (a), (b) and (c) are explanatory drawings which show one form in each process, respectively. It is. It is process explanatory drawing which shows the latter half process of the friction stir spot joining method following FIG. 5, Comprising: (a), (b) and (c) are explanatory drawings which each show one form of the process. FIG. 5 is an enlarged explanatory view corresponding to FIG. 2 and showing another example of the rotary tool for friction stir spot joining according to the present invention. It is CC sectional explanatory drawing in FIG. It is DD sectional explanatory drawing in FIG. FIG. 5 is an enlarged explanatory view corresponding to FIG. 2, showing still another example of the friction stir spot welding rotary tool according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Friction stirring point joining rotary tool 12 Probe 12a Probe tip part 12b Probe base part 14 Shoulder member 14a Shoulder tip part 14b Shoulder base part 14c Shoulder surface 16 Press member 16a Press tip part 16b Press base part 18 Holding member 20 Stay 22 Compression coil spring 24a Narrow gap 24b Enlarged gap 26a Narrow gap 26b Enlarged gaps 28a-28d First protrusions 30a-30d First discharge holes 32a-32d Lower second protrusions 34a-34d Upper second protrusions 36a-36d Lower second discharge Holes 38a to 38d Upper second discharge hole 40 Backing jigs 42 and 44 Metal plate 46 Friction stirrer 48 Probe hole 50 Joiner 52 Friction stir spot welding rotary tools 54a to 54d First discharge holes 56a to 56d Lower second Two discharge holes 58a to 58d Upper second discharge hole 60 Friction Rotating tool for stirring point joining 62 Screw part

Claims (11)

Each plate-like part of a plurality of metal members to be joined is superposed, a rod-like probe that is inserted while being rotated from one side of the overlapped part, and is externally fitted around the probe and positioned coaxially. A cylindrical shoulder member having a shoulder surface that is brought into contact with the surface of the one side in a rotating state, and the probe and the shoulder member are configured separately and separately in the axial direction. A friction stir spot welding rotary tool that exhibits a double-acting structure that can be moved to
The material of the to-be-joined metal member that has entered at least one of the inner peripheral surface of the shoulder member and the outer peripheral surface of the probe from the gap between the inner peripheral surface of the shoulder member and the outer peripheral surface of the probe A protrusion for dividing the residue is provided, and a discharge hole penetrating the cylindrical wall of the shoulder member is formed. Through the discharge hole, the material residue divided by the protrusion is formed on the shoulder member. A friction stir spot welding rotary tool characterized in that it can be discharged to the outside.   A cylindrical pressing member is coaxially inserted on the outer peripheral surface of the shoulder member, and the front end surface of the pressing member is one of the overlapping portions by an urging force applied in the axial direction of the pressing member. The inner surface of the pressing member and the shoulder member on at least one of the inner surface of the pressing member and the outer surface of the shoulder member. A protrusion for separating material debris of the metal member to be joined that has entered from the gap between the outer peripheral surface of the pressing member and a discharge hole penetrating the cylindrical wall of the pressing member is formed. 2. The friction stir spot welding rotary tool according to claim 1, wherein the material residue divided by the protrusion can be discharged to the outside of the pressing member through a hole. Each plate-like part of a plurality of metal members to be joined is superposed, a rod-like probe that is inserted while being rotated from one side of the overlapped part, and is externally fitted around the probe and positioned coaxially. A cylindrical shoulder member having a shoulder surface that is brought into contact with the surface of the one side under rotation, and an urging force that is coaxially extrapolated to the outer peripheral surface of the shoulder member and acts in the axial direction. A cylindrical pressing member whose tip surface can be pressed against a surface on one side of the superposed portion, and the probe and the shoulder member are configured separately, A friction stir spot welding rotary tool that exhibits a double-acting structure that is separately movable in the axial direction,
The metal member to be joined which has entered at least one of the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member through a gap between the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member. And a discharge hole penetrating the cylindrical wall of the pressing member is formed, and the material residue divided by the protrusion is pressed through the discharge hole. A friction stir spot welding rotary tool characterized in that it can be discharged to the outside of a member.   The rotary tool for friction stir spot welding according to claim 3, wherein a discharge hole penetrating the cylindrical wall is formed in the shoulder member.   The gap between the inner peripheral surface of the shoulder member and the outer peripheral surface of the probe is a narrow gap on the distal end side, and an enlarged gap that is a gap larger than the narrow gap on the base side. Furthermore, the discharge hole which penetrates the cylinder wall of this shoulder member is formed in the formation part of this enlarged gap in this shoulder member, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. The rotary tool for friction stir spot welding as described.   The gap between the inner peripheral surface of the pressing member and the outer peripheral surface of the shoulder member is a narrow gap on the distal end side, while the gap on the base side is an enlarged gap that is larger than the narrow gap. Furthermore, the discharge hole which penetrates the cylinder wall of this press member is formed in the formation part of this enlarged gap in this press member, The any one of Claim 2 thru | or 5 characterized by the above-mentioned. The rotary tool for friction stir spot welding described in 1.   The discharge hole penetrating the cylindrical wall of the shoulder member is formed to be inclined toward the shoulder surface side from the outer peripheral surface side to the inner peripheral surface side of the shoulder member. The rotary tool for friction stir spot welding according to any one of claims 2 and 4 to 6.   The discharge hole penetrating the cylindrical wall of the pressing member is formed so as to be inclined toward the tip surface side from the outer peripheral surface side to the inner peripheral surface side of the pressing member. The rotary tool for friction stir spot welding according to any one of claims 7 to 10.   The discharge hole penetrating the cylindrical wall of the shoulder member extends in a direction different from the direction toward the central axis from the outer peripheral surface side to the inner peripheral surface side of the shoulder member. The rotary tool for friction stir spot welding according to any one of claims 1, 2, and 4 to 8.   The discharge hole penetrating the cylindrical wall of the pressing member extends in a direction different from the direction toward the central axis from the outer peripheral surface side to the inner peripheral surface side of the pressing member. The rotary tool for friction stir spot welding according to any one of claims 9 to 9. A friction stir spot welding apparatus comprising the rotary tool for friction stir spot welding according to any one of claims 1 to 10.

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