JP2018134668A - Joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining method capable of preventing a metal shortage of a joint portion.SOLUTION: A joining method includes: a butting step; a first arrangement step of arranging a first auxiliary member 10 so as to come into surface contact with a surface of a first metal member 1 or a second metal member 2; a first friction stirring step of joining the first metal member 1, the second metal member 2, and the first auxiliary member 10; a first removal step of removing the first auxiliary member 10 on which a burr V is formed from the first metal member 1 or the second metal member 2; a reversing step of reversing the first metal member 1 and the second metal member 2; a second arrangement step of arranging a second auxiliary member so as to come into surface contact with a rear face of the first metal member 1 or the second metal member 2; a second friction stirring step of joining the first metal member 1, the second metal member 2, and the second auxiliary member; and a second removal step of removing the second auxiliary member on which the burr is formed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a joining method for joining metal members together by friction stirring.

  For example, Patent Document 1 discloses a joining method in which a first metal member and a second metal member are joined by friction stirring. In the joining method, after the first metal member and the second metal member are butted together to form a butted portion, only the stirring pin of the rotary tool is brought into contact with the first metal member and the second metal member. On the other hand, friction stirring is performed.

JP 2013-39613 A

  In the conventional joining method, since the plastic fluidized metal is not pressed by the shoulder portion of the rotary tool, there is a problem that the plastic fluidized metal overflows to the outside and the joint becomes insufficient.

  Then, this invention makes it a subject to provide the joining method which can prevent the metal shortage of a junction part.

  In order to solve the above-mentioned problem, the present invention is a joining method for joining a first metal member and a second metal member using a rotary tool provided with a stirring pin, the end surface of the first metal member, and the A butting step of butting the end surface of the second metal member to form a butting portion; a first disposing step of disposing the first auxiliary member so as to be in surface contact with the surface of the first metal member or the second metal member; The rotating agitation pin is inserted from the surface side of the first auxiliary member, and only the agitation pin is in contact with the first metal member, the second metal member, and the first auxiliary member, and the butt portion A burr was formed by the first friction stirring step and the first friction stirring step of joining the first metal member, the second metal member and the first auxiliary member by relatively moving the rotary tool along The first auxiliary member is A first removing step for removing from one metal member or the second metal member, a turning step for turning over the first metal member and the second metal member, and a back surface of the first metal member or the second metal member. A second disposing step of disposing the second auxiliary member so as to contact, and the rotating stirring pin is inserted from the surface side of the second auxiliary member, and only the stirring pin is inserted into the first metal member and the second metal Second friction for joining the first metal member, the second metal member, and the second auxiliary member by relatively moving the rotary tool along the abutting portion in contact with the member and the second auxiliary member. A stirring step and a second removal step of removing the second auxiliary member formed with burrs by the second friction stirring step from the first metal member or the second metal member.

  According to this joining method, the first metal member and the second metal member are joined, and the first auxiliary member or the second auxiliary member is simultaneously friction stir welded in addition to the first metal member and the second metal member. As a result, it is possible to prevent metal shortage at the joint. Moreover, although the thermal distortion by a 1st friction stirring process generate | occur | produces and there exists a possibility that a 1st metal member and a 2nd metal member may warp, a friction stir welding is also performed from the back side of a 1st metal member and a 2nd metal member. Therefore, the warpage can be eliminated and the flatness of the first metal member and the second metal member can be improved. In the first friction stirring step and the second friction stirring step, only the stirring pin is brought into contact with the first metal member and the second metal member, so that the load on the friction stirring device can be reduced.

In the first friction agitation step, it is preferable to set the joining conditions so that burrs generated in the friction stir welding are formed on the first auxiliary member.
In the second friction stirring step, it is preferable to set the joining conditions so that burrs generated in the friction stir welding are formed on the second auxiliary member.

  According to this joining method, since burrs can be collected on the first auxiliary member or the second auxiliary member, the burrs can be easily removed together with the first auxiliary member or the second auxiliary member.

  Moreover, this invention is a joining method which joins a 1st metal member and a 2nd metal member using the rotary tool provided with the stirring pin, Comprising: The end surface of said 1st metal member, and the end surface of said 2nd metal member And a first placement step of placing the first auxiliary member in surface contact with the surfaces of the first metal member and the second metal member, and the rotating stirring pin Is inserted from the surface side of the first auxiliary member, and only the stirring pin is in contact with the first metal member, the second metal member, and the first auxiliary member, and the rotating tool along the abutting portion. A first friction stirrer step for joining the first metal member, the second metal member and the first auxiliary member by relative movement, and the first auxiliary member on which burrs are formed by the first friction stirrer step. The first metal member and the A first removal step of removing from the two metal members, a turnover step of turning over the first metal member and the second metal member, and a second contact with the back surface of the first metal member or the second metal member. A second arrangement step of arranging an auxiliary member, and the rotating stirring pin is inserted from the surface side of the second auxiliary member, and only the stirring pin is inserted into the first metal member, the second metal member, and the second auxiliary. A second friction stirring step of joining the first metal member, the second metal member, and the second auxiliary member by relatively moving the rotary tool along the abutting portion in contact with the member; And a second removal step of removing the second auxiliary member in which burrs are formed by the two-friction stirring step from the first metal member or the second metal member.

  According to this joining method, the first metal member and the second metal member are joined, and the first auxiliary member or the second auxiliary member is simultaneously friction stir welded in addition to the first metal member and the second metal member. As a result, it is possible to prevent metal shortage at the joint. Moreover, although the thermal distortion by a 1st friction stirring process generate | occur | produces and there exists a possibility that a 1st metal member and a 2nd metal member may warp, a friction stir welding is also performed from the back side of a 1st metal member and a 2nd metal member. Therefore, the warpage can be eliminated and the flatness of the first metal member and the second metal member can be improved. In the first friction stirring step and the second friction stirring step, only the stirring pin is brought into contact with the first metal member and the second metal member, so that the load on the friction stirring device can be reduced.

  Further, in the first arrangement step, the first auxiliary member is disposed on one of the surfaces of the first metal member and the second metal member, and slightly protrudes to the other side with the butting portion interposed therebetween. In the first friction stirring step, burrs generated in the friction stir welding are formed on either one of the first metal member and the second metal member in the first auxiliary member. It is preferable to set the joining conditions.

  According to such a joining method, the work of removing burrs can be performed more easily. Moreover, since the auxiliary member is slightly protruded on the other side across the butting portion, it is possible to more reliably prevent metal shortage at the joint portion.

  In the second friction stirring step, it is preferable to set the joining conditions so that burrs generated in the friction stirring step are formed on the second auxiliary member.

  According to this joining method, since burrs can be concentrated on the second auxiliary member, the burrs can be easily removed together with the second auxiliary member.

  Moreover, it is a joining method which joins a 1st metal member and a 2nd metal member using the rotary tool provided with the stirring pin, Comprising: The end surface of the said 1st metal member and the end surface of the said 2nd metal member are faced | matched A butting step for forming a butting portion, a first disposing step for disposing a first auxiliary member so as to be in surface contact with the surface of the first metal member or the second metal member, and the rotating stirring pin for the first The rotary tool is inserted from the surface side of the auxiliary member, and the rotary tool is relatively moved along the abutting portion in a state where only the stirring pin is in contact with the first metal member, the second metal member, and the first auxiliary member. The first metal member, the second metal member, and the first auxiliary member are joined to each other, and the first auxiliary member in which burrs are formed by the first friction member is used as the first metal. Member or said second metal part Removing the first auxiliary member from the first metal member and the second metal member, the second metal member and the second metal member so as to be in surface contact with the back surface of the first metal member and the second metal member. A second arrangement step to be arranged and the rotating stirring pin are inserted from the surface side of the second auxiliary member, and only the stirring pin contacts the first metal member, the second metal member and the second auxiliary member A second friction stirring step of joining the first metal member, the second metal member, and the second auxiliary member by relatively moving the rotary tool along the abutting portion in the state of being brought into contact, and the second friction stirring And a second removal step of removing the second auxiliary member having the burr formed by the step from the first metal member and the second metal member.

  According to this joining method, the first metal member and the second metal member are joined, and the first auxiliary member or the second auxiliary member is simultaneously friction stir welded in addition to the first metal member and the second metal member. As a result, it is possible to prevent metal shortage at the joint. Moreover, although the thermal distortion by a 1st friction stirring process generate | occur | produces and there exists a possibility that a 1st metal member and a 2nd metal member may warp, a friction stir welding is also performed from the back side of a 1st metal member and a 2nd metal member. Therefore, the warpage can be eliminated and the flatness of the first metal member and the second metal member can be improved. In the first friction stirring step and the second friction stirring step, only the stirring pin is brought into contact with the first metal member and the second metal member, so that the load on the friction stirring device can be reduced.

  In the first friction agitation step, it is preferable to set the joining conditions so that burrs generated in the friction stir welding are formed on the first auxiliary member.

  According to this joining method, since burrs can be concentrated on the first auxiliary member, the burrs can be easily removed together with the first auxiliary member.

  Moreover, this invention is a joining method which joins a 1st metal member and a 2nd metal member using the rotary tool provided with the stirring pin, Comprising: The end surface of said 1st metal member, and the end surface of said 2nd metal member And a first placement step of placing the first auxiliary member in surface contact with the surfaces of the first metal member and the second metal member, and the rotating stirring pin Is inserted from the surface side of the first auxiliary member, and only the stirring pin is in contact with the first metal member, the second metal member, and the first auxiliary member, and the rotating tool along the abutting portion. A first friction stirrer step for joining the first metal member, the second metal member and the first auxiliary member by relative movement, and the first auxiliary member on which burrs are formed by the first friction stirrer step. The first metal member and the A first removal step of removing from the two metal members, a turnover step of turning the first metal member and the second metal member over, and a second contact with the back surfaces of the first metal member and the second metal member. A second arrangement step of arranging an auxiliary member, and the rotating stirring pin is inserted from the surface side of the second auxiliary member, and only the stirring pin is inserted into the first metal member, the second metal member, and the second auxiliary. A second friction stirring step of joining the first metal member, the second metal member, and the second auxiliary member by relatively moving the rotary tool along the abutting portion in contact with the member; And a second removing step of removing the second auxiliary member having the burr formed by the two-friction stirring step from the first metal member and the second metal member.

  According to this joining method, the first metal member and the second metal member are joined, and the first auxiliary member or the second auxiliary member is simultaneously friction stir welded in addition to the first metal member and the second metal member. As a result, it is possible to prevent metal shortage at the joint. Moreover, although the thermal distortion by a 1st friction stirring process generate | occur | produces and there exists a possibility that a 1st metal member and a 2nd metal member may warp, a friction stir welding is also performed from the back side of a 1st metal member and a 2nd metal member. Therefore, the warpage can be eliminated and the flatness of the first metal member and the second metal member can be improved. In the first friction stirring step and the second friction stirring step, only the stirring pin is brought into contact with the first metal member and the second metal member, so that the load on the friction stirring device can be reduced.

  Further, in the first arrangement step, the first auxiliary member is disposed on one of the surfaces of the first metal member and the second metal member, and slightly protrudes to the other side with the butting portion interposed therebetween. In the first friction stirring step, burrs generated in the friction stir welding are formed on either one of the first metal member and the second metal member in the first auxiliary member. It is preferable to set the joining conditions.

  According to such a joining method, the work of removing burrs can be performed more easily. Moreover, since the auxiliary member is slightly protruded on the other side across the butting portion, it is possible to more reliably prevent metal shortage at the joint portion.

  According to the joining method according to the present invention, metal shortage at the joint can be prevented.

It is sectional drawing which shows the butt | matching process and 1st arrangement | positioning process which concern on 1st embodiment of this invention. It is sectional drawing which shows the 1st friction stirring process which concerns on 1st embodiment. It is sectional drawing which shows after the 1st friction stirring process which concerns on 1st embodiment. It is sectional drawing which shows the 1st removal process which concerns on 1st embodiment. It is sectional drawing which shows the 1st removal process after 1st embodiment. It is sectional drawing which shows the 2nd arrangement | positioning process which concerns on 1st embodiment. It is sectional drawing which shows the 2nd friction stirring process which concerns on 1st embodiment. It is sectional drawing which shows the 2nd removal process which concerns on 1st embodiment. It is sectional drawing which shows the 2nd removal process after 1st embodiment. It is sectional drawing which shows the butt | matching process and 1st arrangement | positioning process which concern on 2nd embodiment of this invention. It is sectional drawing which shows the 1st friction stirring process which concerns on 2nd embodiment. It is sectional drawing which shows the 1st removal process which concerns on 2nd embodiment. It is sectional drawing which shows the 1st arrangement | positioning process which concerns on the modification of 2nd embodiment. It is sectional drawing which shows the 1st friction stirring process which concerns on the modification of 2nd embodiment. It is sectional drawing which shows the 2nd arrangement | positioning process which concerns on 3rd embodiment of this invention. It is sectional drawing which shows the 2nd friction stirring process which concerns on 3rd embodiment. It is sectional drawing which shows the 2nd removal process which concerns on 3rd embodiment.

[First embodiment]
A joining method according to a first embodiment of the present invention will be described in detail with reference to the drawings. In the joining method according to the present embodiment, the butting process, the first arrangement process, the first friction stirring process, the first removal process, the turnover process, the second arrangement process, the second friction stirring process, And two removal steps. In the following description, “front surface” means a surface opposite to the “back surface”.

  A butt | matching process is a process of butt | matching the 1st metal member 1 and the 2nd metal member 2 as shown in FIG. The first metal member 1 and the second metal member 2 are metal plate-like members. The material of the first metal member 1 and the second metal member 2 is not particularly limited as long as it is a metal that can be frictionally stirred. For example, aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy, etc. May be selected as appropriate. The plate | board thickness of the 1st metal member 1 and the 2nd metal member 2 is equivalent. The plate thicknesses of the first metal member 1 and the second metal member 2 may be set as appropriate.

  In the butting step, the end surface 1a of the first metal member 1 and the end surface 2a of the second metal member 2 are butted to form a butting portion J1. The surface 1b of the first metal member 1 and the surface 2b of the second metal member 2 are flush with each other.

  The first arrangement step is a step of arranging the first auxiliary member 10 on the first metal member 1 or the second metal member 2. The first auxiliary member 10 is a metal plate member. The first auxiliary member 10 is not particularly limited as long as it is a metal capable of friction stirring, but in the present embodiment, the first auxiliary member 10 is made of the same material as the first metal member 1 and the second metal member 2. The plate | board thickness of the 1st auxiliary member 10 is suitably set so that the plasticization area | region W1 after the 1st friction stirring process mentioned later may not run out of metal shortage. In the present embodiment, the plate thickness of the first auxiliary member 10 is set to be thinner than that of the first metal member 1.

  In the first arrangement step of the present embodiment, the back surface 10c of the first auxiliary member 10 and the surface 2b of the second metal member 2 are brought into surface contact. The first auxiliary member 10 is disposed so as to be in surface contact with only the second metal member 2 (or the first metal member 1). In this embodiment, it arrange | positions so that the end surface 10a of the 1st auxiliary member 10 and the end surface 2a of the 2nd metal member 2 may become flush | level. Moreover, the 1st metal member 1, the 2nd metal member 2, and the 1st auxiliary member 10 are restrained to the mount frame T so that a movement is impossible using jig | tool T1, T1. In addition, although the 1st auxiliary member 10 is made into plate shape in this embodiment, another shape may be sufficient.

  As shown in FIG. 2, the first friction agitation step is a step of joining the butted portion J <b> 1 between the first metal member 1 and the second metal member 2 by friction agitation using the joining rotary tool F. The joining rotary tool F includes a connecting portion F1 and a stirring pin F2. The joining rotary tool F corresponds to a “rotary tool” in the claims. The joining rotary tool F is made of, for example, tool steel. The connecting part F1 is a part connected to a rotating shaft (not shown) of the friction stirrer. The connecting portion F1 has a cylindrical shape.

  The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. A spiral groove is formed on the outer peripheral surface of the stirring pin F2. In the present embodiment, the spiral groove is formed clockwise as it goes from the proximal end to the distal end in order to rotate the joining rotary tool F counterclockwise. In other words, when the spiral groove is traced from the proximal end to the distal end, the spiral groove is formed clockwise when viewed from above.

  In addition, when rotating the rotation tool F for joining clockwise, it is preferable to form a spiral groove counterclockwise as it goes to the front-end | tip from a base end. In other words, the spiral groove in this case is formed counterclockwise as viewed from above when the spiral groove is traced from the base end to the tip end. By setting the spiral groove in this way, the metal plastically fluidized during friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the quantity of the metal which overflows outside the to-be-joined metal member (the 1st metal member 1, the 2nd metal member 2, and the 1st auxiliary member 10) can be decreased. The spiral groove may be omitted.

  In the first friction stirring step, only the stirring pin F2 rotated counterclockwise from the surface 10b of the first auxiliary member 10 is inserted, and the metal member to be joined and the connecting portion F1 are moved relative to each other while being separated. In other words, the friction stir welding is performed with the base end portion of the stirring pin F2 exposed. And the rotation tool F for joining is relatively moved along the abutting part J1 in the state which made the 1st metal member 1, the 2nd metal member 2, the 1st auxiliary member 10, and the stirring pin F2 contact. In the present embodiment, the traveling direction of the joining rotary tool F is set so that the first auxiliary member 10 is positioned on the left side in the traveling direction of the joining rotary tool F. That is, in the present embodiment, the bonding rotary tool F is relatively moved from the near side to the far side in FIG.

  The rotation direction and the traveling direction of the joining rotary tool F are not limited to those described above, and may be set as appropriate. For example, the joining rotary tool F may be rotated to the right while the first auxiliary member 10 is disposed on the left side in the traveling direction of the joining rotary tool F. Alternatively, the bonding rotary tool F may be rotated to the left or right while the first auxiliary member 10 is disposed on the right side in the traveling direction of the bonding rotary tool F. The conditions such as the rotation direction of the joining rotary tool F and the preferred positional relationship of the first auxiliary member 10 will be described later.

  What is necessary is just to set the insertion depth of the stirring pin F2 suitably according to the plate | board thickness etc. of the 1st metal member 1 and the 2nd metal member 2, making the stirring pin F2 and the butt | matching part J1 contact. In the present embodiment, the agitation pin F <b> 2 is inserted up to about half the plate thickness of the first metal member 1 and the second metal member 2. A plasticized region W1 is formed in the movement locus of the welding rotary tool F. After the first friction stirring step, burrs V are formed at the end of the first auxiliary member 10 as shown in FIG.

  The first removal step is a step of removing the first auxiliary member 10 from the second metal member 2 as shown in FIG. In the first removal step, the first auxiliary member 10 on which the burr V is formed is bent in a direction away from the second metal member 2 by, for example, manual work, and the burr V is removed from the second metal member 2 together.

  As shown in FIG. 5, when the jigs T1 and T1 are released after finishing the first removal step, thermal distortion occurs due to thermal contraction of the first metal member 1 and the second metal member 2, and the first metal member Warpage occurs so that the surface 1b of 1 and the surface 2b side of the second metal member 2 are concave. In addition, a slight gap is formed on the back side of the abutting portion J1.

  As shown in FIG. 6, the inside-out process is a process in which the first metal member 1 and the second metal member 2 are turned over and fixed to the gantry T using jigs T1 and T1.

  In the second arrangement step, the second auxiliary member 20 is arranged on the back surface 1c of the first metal member 1 and the second auxiliary member 20 is arranged on the back surface 2c of the second metal member 2 as shown in FIG. The second auxiliary member 20 is not particularly limited as long as it is a metal capable of friction stirring, but in the present embodiment, it is made of the same material as the first metal member 1 and the second metal member 2. The plate | board thickness of the 2nd auxiliary member 20 is suitably set so that the plasticization area | region W2 after the 2nd friction stirring process mentioned later may not run out of metal shortage. In the present embodiment, the plate thickness of the second auxiliary member 20 is set to be thinner than that of the first metal member 1.

  In the second arrangement step of the present embodiment, the back surface 20c of one second auxiliary member 20 and the back surface 1c of the first metal member 1 are brought into surface contact, and the back surface 20c of the other second auxiliary member 20 and the second metal member The back surface 2c of 2 is brought into surface contact. In the present embodiment, the second auxiliary members 20, 20 are arranged with a gap therebetween, but may be arranged in contact with each other. Moreover, although the 2nd auxiliary members 20 and 20 were comprised by two plate-shaped members, it is good also as a single 2nd auxiliary member arrange | positioned so that the 1st metal member 1 and the 2nd metal member 2 may be straddled. In this case, the second auxiliary member may be formed in accordance with the warp of the first metal member 1 and the second metal member 2.

  As shown in FIG. 7, the second friction stirring step is a step of joining the butted portion J <b> 1 between the first metal member 1 and the second metal member 2 by friction stirring using the welding rotary tool F. In the second friction stirring step, the joining rotary tool F is inserted from the surfaces 20b, 20b side of the second auxiliary member 20, and the joining rotary tool F is relatively moved from the near side to the far side in FIG. The insertion depth of the agitation pin F2 may be set as appropriate, but in this embodiment, the agitation pin F2 and the plasticized region W1 are set in contact with each other. A plasticized region W2 is formed in the movement locus of the welding rotary tool F. In the second friction stirring step, burrs V are generated in each of the divided second auxiliary members 20, 20, but the burrs V are concentrated on one of the divided second auxiliary members 20, 20. In this way, the joining conditions may be set.

  The second removal step is a step of removing the second auxiliary members 20 and 20 from the first metal member 1 and the second metal member 2 as shown in FIG. In the second removal step, the second auxiliary members 20 and 20 on which the burrs V are formed are bent in a direction away from the first metal member 1 and the second metal member 2 by, for example, manual work, and the first metal together with the burrs V is obtained. Remove from member 1 and second metal member 2.

  As shown in FIG. 9, after the second removal step is finished, the first metal member 1 and the second metal member 2 are released from the jigs T1 and T1 (see FIG. 8). Thermal shrinkage due to region W2) occurs. Thereby, the curvature which generate | occur | produced at the 1st friction stirring process is eliminated, and the 1st metal member 1 and the 2nd metal member 2 become flat.

  According to the joining method according to the present embodiment described above, the first metal member 1 and the second metal member 2 are joined, and in addition to the first metal member 1 and the second metal member 2, the first auxiliary member. By performing friction stir welding at the same time, it is possible to prevent a shortage of metal at the joint (plasticized region W1). According to the first friction agitation step, metal shortage can be prevented by arranging the first auxiliary member 10 only on one side, not on both the first metal member 1 and the second metal member 2.

  Further, according to the second friction stirring step, in addition to the first metal member 1 and the second metal member 2, the second auxiliary members 20 and 20 are simultaneously friction stir welded, so that the joining portion (plasticization region W <b> 2). Metal shortage can be prevented. Moreover, since the whole height direction of the butt | matching part J1 is friction-stirred, joining strength can be raised.

  Moreover, in this embodiment, although the thermal distortion by a 1st friction stirring process generate | occur | produces and there exists a possibility that the 1st metal member 1 and the 2nd metal member 2 may warp, the 1st metal member 1 and the 2nd metal member 2 may exist. Since the friction stir welding is also performed from the back side, the warpage can be eliminated and the flatness of the first metal member 1 and the second metal member 2 can be improved. Moreover, since only the stirring pin F2 is brought into contact with the first metal member 1 and the second metal member 2 in the first friction stirring step and the second friction stirring step, the load on the friction stirring device can be reduced.

  Here, in the joining method according to the present embodiment, the first auxiliary member 10 and the second auxiliary members 20 and 20 are set to be thinner than the first metal member 1 and the second metal member 2, so that the conventional method is used. If friction stirring is performed while pushing the shoulder portion into the metal member, each auxiliary member is blown to the outside due to the contact between the shoulder portion and each auxiliary member, and the metal shortage at the joint portion cannot be compensated. However, in this embodiment, since the friction stir is performed while only the stirring pin F2 of the rotating tool F for welding is brought into contact with the first metal member 1, the second metal member 2, and each auxiliary member, each auxiliary member is skipped to the outside. It is possible to make up for the metal shortage at the joint without being damaged.

  In addition, when friction stir welding is performed using a rotary tool including a shoulder portion and a stirring pin as in the conventional case, a tunnel-shaped cavity defect may occur in the plasticized region. However, in this embodiment, since only the stirring pin F2 is brought into contact with the first metal member 1 and the second metal member 2 to perform frictional stirring, tunnel-like cavity defects are generated in the plasticized regions W1 and W2. Can be prevented. Thereby, the repair process which repairs the said cavity defect can be skipped.

  In addition, as shown in FIG. 2, in the first friction stirring step according to the present embodiment, the first auxiliary member 10 is disposed on the left side in the traveling direction and the rotating tool F for rotation is rotated counterclockwise. It becomes the Re side (Retreating side). The Re side is the side on which the magnitude of the feed speed is subtracted from the magnitude of the tangential speed on the outer circumference of the welding rotary tool F. On the other hand, the side opposite to the Re side is the Ad side (Advancing side). The Ad side is a side where the magnitude of the feed speed is added from the magnitude of the tangential speed on the outer periphery of the welding rotary tool F.

  For example, when the rotational speed of the welding rotary tool F is low, the temperature of the plastic fluidized material is more likely to rise on the Ad side than on the Re side of the plasticizing region W1, so that more burrs V are generated on the Ad side. Tend to. On the other hand, for example, when the rotational speed of the bonding rotary tool F is high, the temperature of the plastic fluidized material increases on the Ad side, but there is a tendency that burrs V are generated on the Re side due to the higher rotational speed.

  In this embodiment, since the rotational speed of the joining rotary tool F is set to be high, burrs V are generated on the Re side, that is, the first auxiliary member 10 side. That is, in the present embodiment, the rotational speed, the rotational direction, the traveling direction, and the like of the joining rotary tool F are set so that many burrs V are formed on the first auxiliary member 10 side. Thereby, since the burr | flash V formed in the 1st auxiliary member 10 is removed with the 1st auxiliary member 10, a 1st removal process can be performed more easily. Moreover, the moving speed (feeding speed) of the joining rotary tool F can be increased by setting the rotational speed of the joining rotary tool F faster. Thereby, a joining cycle can be shortened.

  As described above, in the first friction stirring process, on which side of the traveling direction of the welding rotary tool F the burr V is generated depends on the joining conditions. The joining conditions include the rotational speed, rotational direction, moving direction, moving speed (feeding speed) of the rotating tool F for joining, the inclination angle of the stirring pin F2, the first metal member 1, the second metal member 2, and the first auxiliary. It is determined by each element such as the material of the member 10 and the thickness of each member and the combination of these elements. It is preferable to arrange the first auxiliary member 10 on the side where burrs V are generated or on the side where many burrs V are generated, depending on the joining conditions, because the first removal step can be easily performed.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. In the joining method according to the second embodiment, the butting step, the first placement step, the first friction stirring step, the first removal step, the inside out step, the second placement step, the second friction stirring step, A second removal step. In the second embodiment, the description will focus on the parts that are different from the first embodiment.

  The matching process is the same as in the first embodiment. The first arrangement step is a step of arranging the first auxiliary member 10 on the first metal member 1 and the second metal member 2 as shown in FIG. In the first arrangement step, the first auxiliary member 10 is arranged so as to straddle the butting portion J1.

  As shown in FIG. 11, the first friction stirring step is a step of friction stir welding of the butt joint J <b> 1 using the rotating tool F for bonding. In the first friction stirring step, the rotating stirring pin F2 is inserted from the surface 10b of the first auxiliary member 10, and the joining rotary tool F is relatively moved along the abutting portion J1. In the first friction stirring step, only the stirring pin F2 is brought into contact with the first metal member 1, the second metal member 2, and the first auxiliary member 10 to perform friction stir welding. A plasticized region W1 is formed in the movement locus of the welding rotary tool F. Also, as shown in FIG. 12, burrs V and V are formed at the ends of the divided first auxiliary members 10 and 10 after the first friction stirring step, respectively. The joining conditions may be set so that the burrs V are concentrated on one of the divided first auxiliary members 10 and 10.

  The first removal step is a step of removing the first auxiliary member 10 from the first metal member 1 and the second metal member 2. In the first removal step, the first auxiliary members 10 and 10 together with the burrs V and V are removed by bending the ends of the divided first auxiliary members 10 and 10.

  When the jigs T1 and T1 are released after finishing the first removal step, thermal distortion occurs due to thermal contraction of the first metal member 1 and the second metal member 2, and the surface 1b and the second metal member 1 are exposed to heat. Warpage occurs so that the surface 2b side of the metal member 2 is concave (see FIG. 5).

  Since the inside-out process, the second arrangement process, the second friction stirring process, and the second removal process are the same as those in the first embodiment, the description thereof is omitted.

  Also by the joining method according to the second embodiment described above, substantially the same effect as the first embodiment can be obtained. Like the 1st arrangement | positioning process and 1st friction stirring process which concern on 2nd embodiment, the 1st auxiliary member 10 is arrange | positioned ranging over the 1st metal member 1 and the 2nd metal member 2, and friction stir welding is performed. May be. In the first friction stirring step of this embodiment, the stirring pin F2 can be easily inserted into the first auxiliary member 10.

[Modification of Second Embodiment]
Next, a modification of the second embodiment will be described. In the said modification, a 1st arrangement | positioning process, a 1st friction stirring process, and a 1st removal process differ from 2nd embodiment. In the first arrangement step according to the modification, as shown in FIG. 13, the first auxiliary member 10 is arranged so as to contact both the first metal member 1 and the second metal member 2, and the first auxiliary member is arranged. 10, the contact ratio between the first metal member 1 and the second metal member 2 is changed.

  In the first arrangement step, about 90% of the first auxiliary member 10 is arranged on the second metal member 2 and the remaining 10% is arranged on the first metal member 1. That is, it arrange | positions so that the 1st auxiliary member 10 may protrude slightly in the 1st metal member 1 side with respect to the butt | matching part J1. The first auxiliary member 10 is disposed so that the first auxiliary member 10 is in surface contact with both the first metal member 1 and the second metal member 2 and after the first friction stirring step described later is performed. It adjusts so that the 1st auxiliary member 10 may not remain on the 1st metal member 1 side (side with a small contact area with the 1st auxiliary member 10).

  In the first friction stirring step, as shown in FIGS. 13 and 14, a stirring pin F2 that rotates from the surface 10b of the first auxiliary member 10 is inserted, and the welding rotary tool F is relatively moved along the abutting portion J1. . In the first friction stirring step, the joining conditions are set so that the burrs V are concentrated on the second metal member 2 side of the first auxiliary member 10. Here, the welding rotating tool F is rotated counterclockwise at high speed, and is relatively moved from the near side to the far side in FIG. 14 to perform friction stir welding on the butt portion J1.

  The modified example of the second embodiment described above can achieve substantially the same effect as the second embodiment. Here, as shown in FIG. 2, when the first auxiliary member 10 is disposed so as to contact only the second metal member 2 (or the first metal member 1), the plasticizing region is formed during the first friction stirring step. The balance of W1 may be deteriorated. However, according to the modification, the metal shortage in the plasticized region W1 can be replenished in a well-balanced manner by slightly projecting the first auxiliary member 10 toward the first metal member 1 with respect to the abutting portion J1. . Moreover, in the said modification, since the 1st auxiliary member 10 does not remain in the 1st metal member 1 side, a 1st removal process can be performed easily. Further, since the first auxiliary member 10 is slightly protruded toward the first metal member 1 with respect to the abutting portion J1, the stirring pin F2 can be easily inserted into the first auxiliary member 10.

[Third embodiment]
Next, the joining method according to the third embodiment of the present invention will be described. In the joining method according to the third embodiment, the butting step, the first placement step, the first friction stirring step, the first removal step, the inside out step, the second placement step, the second friction stirring step, A second removal step. The third embodiment will be described with a focus on the differences from the second embodiment.

  The butting process, the first arrangement process, the first friction agitation process, the first removal process and the flipping process of the third embodiment are the first arrangement process, the first friction stirring process, the first removal process and the flipping of the second embodiment. It is the same as the process.

  The 2nd arrangement | positioning process which concerns on this embodiment is a process of arrange | positioning the 2nd auxiliary member 20 only to the 1st metal member 1 (or only the 2nd metal member 2), as shown in FIG. In the second arrangement step, the back surface 20 c of the second auxiliary member 20 is brought into surface contact with the back surface 1 c of the first metal member 1. Moreover, it arrange | positions so that the end surface 20a of the 2nd auxiliary member 20 and the end surface 1a of the 1st metal member 1 may become flush.

  In the second friction stirring step, as shown in FIG. 16, a stirring pin F2 that rotates from the surface 20b of the second auxiliary member 20 is inserted, and the welding rotary tool F is relatively moved along the abutting portion J1. In the second friction stirring step, only the stirring pin F2 is brought into contact with the first metal member 1, the second metal member 2, and the second auxiliary member 20, and the friction stir welding is performed. In the second friction stirring step, the joining conditions are set so that the burrs V are collected on the second auxiliary member 20. Here, the welding rotating tool F is rotated counterclockwise at a high speed and is relatively moved from the near side to the far side in FIG. 16 to perform friction stir welding on the butt portion J1.

  In the second excision step, as shown in FIG. 17, the second auxiliary member 20 is removed from the first metal member 1 by bending the second auxiliary member 20 or the like. When the jigs T1 and T1 are released after the second excision step, the thermal strain generated in the first friction agitation step is eliminated by the second friction agitation step, so that the first metal member 1 and the second metal member 2 are It becomes flat.

  Also by the joining method according to the third embodiment described above, an effect substantially equivalent to that of the second embodiment can be obtained. Moreover, like this embodiment, the 1st auxiliary | assistant member 10 is arrange | positioned so that it may straddle both the 1st metal member 1 and the 2nd metal member 2 in a 1st arrangement | positioning process, and the 2nd auxiliary | assistant member 20 in a 2nd arrangement | positioning process. May be arranged on the first metal member 1 or the second metal member 2.

[Fourth embodiment]
Next, the joining method according to the fourth embodiment of the present invention will be described. In the fourth embodiment, the butting step, the first placement step, the first friction stirring step, the first removal step, the turnover step, the second placement step, the second friction stirring step, and the second removal step And do.

  The butt process, the first arrangement process, the first friction agitation process, the first removal process and the reverse process of the fourth embodiment are the butt process, the first arrangement process, the first friction agitation process, and the first removal of the first embodiment. It is the same as a process and an inside-out process. Moreover, the 2nd arrangement | positioning process, 2nd friction stirring process, and 2nd removal process of 4th embodiment are the same as the 2nd arrangement | positioning process, 2nd friction stirring process, and 2nd removal process of 3rd embodiment.

  Also according to the fourth embodiment, substantially the same effect as the first embodiment can be obtained. Further, as in the fourth embodiment, each auxiliary member may be arranged on the first metal member 1 or the second metal member 2 in both the first arrangement step and the second arrangement step. Moreover, it is preferable to set joining conditions so that the burr | flash V may generate | occur | produce in the 1st auxiliary member 10 and the 2nd auxiliary member 20 in the 1st friction stirring process and 2nd friction stirring process of 4th embodiment. Thereby, since the burr | flash V is collected by the 1st auxiliary member 10 and the 2nd auxiliary member 20, a 1st removal process and a 2nd removal process can be performed easily.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 1st metal member 2 2nd metal member 10 1st auxiliary member 20 2nd auxiliary member F Rotary tool for rotation (rotary tool)
F1 connecting portion F2 stirring pin J1 butt portion V burr W1 plasticizing region W2 plasticizing region

Claims (10)

A joining method for joining the first metal member and the second metal member using a rotary tool equipped with a stirring pin,
A butting step of butting the end surface of the first metal member and the end surface of the second metal member to form a butting portion;
A first arrangement step of arranging the first auxiliary member so as to be in surface contact with the surface of the first metal member or the second metal member;
The rotating stirring pin is inserted from the surface side of the first auxiliary member, and only the stirring pin is in contact with the first metal member, the second metal member, and the first auxiliary member in the butt portion. A first friction stirring step of joining the first metal member, the second metal member, and the first auxiliary member by relatively moving the rotary tool along;
A first removal step of removing the first auxiliary member in which burrs are formed by the first friction stirring step from the first metal member or the second metal member;
Turning over the first metal member and the second metal member;
A second disposing step of disposing a second auxiliary member so as to be in surface contact with the back surface of the first metal member or the second metal member;
The rotating stirring pin is inserted from the surface side of the second auxiliary member, and only the stirring pin is brought into contact with the first metal member, the second metal member, and the second auxiliary member in the butt portion. A second friction stirring step of joining the first metal member, the second metal member, and the second auxiliary member by relatively moving the rotary tool along;
And a second removing step of removing the second auxiliary member having the burr formed by the second friction stirring step from the first metal member or the second metal member.   2. The joining method according to claim 1, wherein in the first friction stirring step, joining conditions are set so that burrs generated in the friction stir welding are formed on the first auxiliary member.   The joining method according to claim 1 or 2, wherein in the second friction stirring step, joining conditions are set so that burrs generated in the friction stir welding are formed in the second auxiliary member. A joining method for joining the first metal member and the second metal member using a rotary tool equipped with a stirring pin,
A butting step of butting the end surface of the first metal member and the end surface of the second metal member to form a butting portion;
A first arrangement step of arranging the first auxiliary member so as to be in surface contact with the surfaces of the first metal member and the second metal member;
The rotating stirring pin is inserted from the surface side of the first auxiliary member, and only the stirring pin is in contact with the first metal member, the second metal member, and the first auxiliary member in the butt portion. A first friction stirring step of joining the first metal member, the second metal member, and the first auxiliary member by relatively moving the rotary tool along;
A first removal step of removing the first auxiliary member in which burrs are formed by the first friction stirring step from the first metal member and the second metal member;
Turning over the first metal member and the second metal member;
A second disposing step of disposing a second auxiliary member so as to be in surface contact with the back surface of the first metal member or the second metal member;
The rotating stirring pin is inserted from the surface side of the second auxiliary member, and only the stirring pin is brought into contact with the first metal member, the second metal member, and the second auxiliary member in the butt portion. A second friction stirring step of joining the first metal member, the second metal member, and the second auxiliary member by relatively moving the rotary tool along;
And a second removing step of removing the second auxiliary member having the burr formed by the second friction stirring step from the first metal member or the second metal member. In the first arrangement step, the first auxiliary member is disposed on one of the surfaces of the first metal member and the second metal member, and slightly protrudes to the other side with the butting portion interposed therebetween. Place and
In the first friction agitation step, the joining conditions are set so that burrs generated by friction agitation welding are formed on either the first metal member or the second metal member of the first auxiliary member. The joining method according to claim 4, wherein:   The joining method according to claim 4 or 5, wherein in the second friction stirring step, joining conditions are set so that burrs generated in the friction stirring step are formed on the second auxiliary member. A joining method for joining the first metal member and the second metal member using a rotary tool equipped with a stirring pin,
A butting step of butting the end surface of the first metal member and the end surface of the second metal member to form a butting portion;
A first arrangement step of arranging the first auxiliary member so as to be in surface contact with the surface of the first metal member or the second metal member;
The rotating stirring pin is inserted from the surface side of the first auxiliary member, and only the stirring pin is in contact with the first metal member, the second metal member, and the first auxiliary member in the butt portion. A first friction stirring step of joining the first metal member, the second metal member, and the first auxiliary member by relatively moving the rotary tool along;
A first removal step of removing the first auxiliary member in which burrs are formed by the first friction stirring step from the first metal member or the second metal member;
Turning over the first metal member and the second metal member;
A second arrangement step of arranging a second auxiliary member so as to be in surface contact with the back surfaces of the first metal member and the second metal member;
The rotating stirring pin is inserted from the surface side of the second auxiliary member, and only the stirring pin is brought into contact with the first metal member, the second metal member, and the second auxiliary member in the butt portion. A second friction stirring step of joining the first metal member, the second metal member, and the second auxiliary member by relatively moving the rotary tool along;
And a second removing step of removing the second auxiliary member having the burr formed by the second friction stirring step from the first metal member and the second metal member.   The joining method according to claim 7, wherein in the first friction stirring step, joining conditions are set so that burrs generated in the friction stir welding are formed on the first auxiliary member. A joining method for joining the first metal member and the second metal member using a rotary tool equipped with a stirring pin,
A butting step of butting the end surface of the first metal member and the end surface of the second metal member to form a butting portion;
A first arrangement step of arranging the first auxiliary member so as to be in surface contact with the surfaces of the first metal member and the second metal member;
The rotating stirring pin is inserted from the surface side of the first auxiliary member, and only the stirring pin is in contact with the first metal member, the second metal member, and the first auxiliary member in the butt portion. A first friction stirring step of joining the first metal member, the second metal member, and the first auxiliary member by relatively moving the rotary tool along;
A first removal step of removing the first auxiliary member in which burrs are formed by the first friction stirring step from the first metal member and the second metal member;
Turning over the first metal member and the second metal member;
A second arrangement step of arranging a second auxiliary member so as to be in surface contact with the back surfaces of the first metal member and the second metal member;
The rotating stirring pin is inserted from the surface side of the second auxiliary member, and only the stirring pin is brought into contact with the first metal member, the second metal member, and the second auxiliary member in the butt portion. A second friction stirring step of joining the first metal member, the second metal member, and the second auxiliary member by relatively moving the rotary tool along;
And a second removing step of removing the second auxiliary member having the burr formed by the second friction stirring step from the first metal member and the second metal member. In the first arrangement step, the first auxiliary member is disposed on one of the surfaces of the first metal member and the second metal member, and slightly protrudes to the other side with the butting portion interposed therebetween. Place and
In the first friction agitation step, the joining conditions are set so that burrs generated by friction agitation welding are formed on either the first metal member or the second metal member of the first auxiliary member. The joining method according to claim 9.

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