JP2018108595A - Joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining method capable of reducing the load applied to a friction stir device and having a high degree of freedom in design. SOLUTION: This is a joining method for joining a first metal member 1 and a second metal member 2 by using a joining rotation tool F provided with a stirring pin F2, and a second metal having a concave groove 2d on a back surface 2c. A butt step in which the end surface 1a of the first metal member 1 is inserted into the concave groove 2d of the member 2 and the end surface 1a is abutted against the bottom surface 2e of the concave groove 2d to form a butt portion J1 and a surface 2b of the second metal member 2. Among them, the arrangement step of arranging the auxiliary member 10 at the position corresponding to the first metal member 1, the rotating stirring pin F2 is inserted from the surface 10a side of the auxiliary member 10, and only the stirring pin F2 is the second metal member 2. And the friction stir welding step of friction stir welding of the butt portion J1 by relatively moving the joining rotary tool F in contact with the auxiliary member 10, the first metal member 1, the second metal member 2, and the auxiliary member 10. , Is included. [Selection diagram] Fig. 2

Description

  The present invention relates to a joining method for friction stir welding of metal members.

  Patent Documents 1 and 2 disclose a technique in which metal members are butted in a T shape when viewed from the front, and the butted portion is friction stir welded. In the related art, after the end surface of the first metal member and the back surface of the second metal member are butted together, a rotating tool is inserted from the surface side of the second metal member, and the butted portion is friction stir welded.

Japanese Patent No. 3947271 Japanese Patent No. 4056587

  In the case of the conventional technique, since the shoulder portion of the rotary tool is brought into contact with the surface of the second metal member to perform friction stirring, there is a problem that a load applied to the friction stirring device increases. Further, since the shoulder portion of the rotary tool is brought into contact with the surface of the second gold member, the width of the plasticizing region is increased. In order to prevent the plastic fluid from flowing out from the inner corners of the first metal member and the second metal member, the plate thickness of the first metal member must be increased.

  From such a viewpoint, an object of the present invention is to provide a joining method that can reduce the load applied to the friction stirrer and has a high degree of design freedom.

  In order to solve such a 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, wherein the first metal member has a concave groove on the back surface. A butting step of inserting an end face of the first metal member into the concave groove of the two metal member and butting the end face against the bottom surface of the concave groove to form a butting portion; and of the surface of the second metal member, An arrangement step of arranging an auxiliary member at a position corresponding to the first metal member, and inserting the rotating stirring pin from the surface side of the auxiliary member, and only the stirring pin, the second metal member and the auxiliary member, Or a friction agitation step of frictionally agitating the abutting portion by relatively moving the rotary tool in a state of being in contact with the first metal member, the second metal member, and the auxiliary member. .

  According to this joining method, the friction stir welding is performed in a state where only the stirring pin is in contact with the second metal member and the auxiliary member, or the first metal member, the second metal member and the auxiliary member. In comparison, the load on the friction stirrer can be reduced. Moreover, since only the stirring pin is inserted, the width of the plasticized region can be reduced. Thereby, since the plate | board thickness of a 1st metal member can also be made small, the freedom degree of design can be raised. In addition to the first metal member and the second metal member, the auxiliary member can also be friction stir welded to prevent metal shortage at the joint. Furthermore, since the end surface of the first metal member is inserted into the groove of the second metal member and the end surface is abutted against the bottom surface of the groove, misalignment between the first metal member and the second metal member is prevented during the abutting process. be able to.

  Moreover, it is preferable to include the removal process which removes the said auxiliary member in which the burr | flash was formed from said 2nd metal member. According to this joining method, the burr can be easily removed together with the auxiliary member.

  In the friction stirring step, it is preferable that the stirring pin is inserted in the central portion of the auxiliary member. According to this joining method, the rotating tool can be easily inserted into the auxiliary member.

  Further, when the position through which the rotation center axis of the rotary tool passes is set as a joining reference line, in the placement step, the auxiliary member is placed only on one side with respect to the joining reference line, and in the friction stirring step, It is preferable to set a joining condition so that the burr is generated in the auxiliary member.

  According to such a joining method, since the burrs can be concentrated on the auxiliary member disposed only on one side with respect to the joining reference line, the burrs can be more easily removed.

  Further, when the position through which the rotation center axis of the rotary tool passes is set as a joining reference line, in the placement step and the friction stirring step, the auxiliary member is placed across the joining reference line, and the joining reference It is preferable that the burr is generated in the auxiliary member on one side with respect to the line, and the arrangement position and joining conditions of the auxiliary member are set so that the auxiliary member does not remain on the other side after the friction stirring step.

  According to such a joining method, metal shortage at the joint can be prevented in a well-balanced manner. Further, after the friction stirring step, the auxiliary member remaining only on one side is removed together with the burr, so that the burr can be more easily removed.

  Moreover, in order to solve such a problem, the present invention is a joining method for joining a first metal member, a second metal member, and a third metal member using a rotary tool equipped with a stirring pin, The end surface of the second metal member that has a shape and has a corner on the back side cut out, and the end surface of the third metal member that has a plate shape and has a corner on the back side cut out to form a groove and a first butt A step of forming a second abutting portion by forming a second abutting portion by inserting an end surface of the plate-like first metal member into the concave groove and abutting the end surface against the bottom surface of the concave groove; And arranging the auxiliary member at a position corresponding to the first metal member among the surfaces of the third metal member, and inserting the stirring pin of the rotary tool from the surface side of the auxiliary member, Relative movement along the concave groove, A friction stir step for friction stir welding the settling portion and the second butting portion, and in the friction stir step, only the stir pin is connected to the second metal member, the third metal member and the auxiliary member, or the The first butted portion and the second butted portion are friction stir welded in contact with the second metal member, the third metal member, the first metal member, and the auxiliary member.

  According to this joining method, only the stirring pin is in contact with the second metal member, the third metal member and the auxiliary member, or the second metal member, the third metal member, the first metal member and the auxiliary member. Since the friction stir welding is performed, the load applied to the friction stirrer can be reduced as compared with the prior art. Moreover, since only the stirring pin is inserted, the width of the plasticized region can be reduced. Thereby, since the plate | board thickness of a 1st metal member can also be made small, the freedom degree of design can be raised. In addition to the first metal member, the second metal member, and the third metal member, the auxiliary member can also be friction stir welded to prevent a metal shortage at the joint. Further, the end surface of the first metal member is inserted into the groove formed by abutting the second metal member and the third metal member and the end surface is abutted against the bottom surface of the groove, Position shift between the second metal member and the third metal member can be prevented.

  Moreover, it is preferable to include the removal process which removes the said auxiliary member in which the burr | flash was formed from said 2nd metal member and said 3rd metal member. According to this joining method, the burr can be easily removed together with the auxiliary member.

  In the friction stirring step, it is preferable that the stirring pin is inserted in the central portion of the auxiliary member. According to this joining method, the rotating tool can be easily inserted into the auxiliary member.

  Further, in the arranging step, the auxiliary member is arranged only on one side with respect to the first butting portion, and in the friction stirring step, a joining condition is set so that the burr is generated in the auxiliary member. preferable.

  According to such a joining method, since the burrs can be concentrated on the auxiliary member disposed only on one side with respect to the first butting portion, the burrs can be more easily removed.

  Moreover, in the arrangement step and the friction stirring step, the auxiliary member is arranged so as to straddle the first abutting portion, and the burr is generated in the auxiliary member on one side with respect to the first abutting portion, And it is preferable to set the arrangement | positioning position and joining conditions of an auxiliary member so that the said auxiliary member may not remain on the other side after the said friction stirring process.

  According to such a joining method, metal shortage at the joint can be prevented in a well-balanced manner. Further, after the friction stirring step, the auxiliary member remaining only on one side is removed together with the burr, so that the burr can be more easily removed.

  According to the joining method according to the present invention, the load applied to the friction stirrer can be reduced and the degree of freedom in design can be increased.

It is a perspective view which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 1st embodiment of this invention. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows after the removal process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 2nd embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 3rd embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 3rd embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 3rd embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 4th embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 4th embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 4th embodiment. It is sectional drawing which shows after the removal process of the joining method which concerns on 4th embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 5th embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 6th 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. As shown in FIG. 1, in the joining method according to the present embodiment, the first metal member 1 and the second metal member 2 are butted in a T shape in front view and joined by friction stirring. In the joining method according to the present embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. The “front surface” in the description means a surface opposite to the “back surface”.

  Both the first metal member 1 and the second metal member 2 have a plate shape. The first metal member 1 and the second metal member 2 are appropriately selected from metals capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy and the like. The plate thickness dimensions of the first metal member 1 and the second metal member 2 may be set as appropriate. On the back surface 2 c of the second metal member 2, a concave groove 2 d that opens to the first metal member 1 side is formed. The concave groove 2 d has a rectangular cross section corresponding to the shape of the first metal member 1. The groove width of the recessed groove 2d is formed to be equal to the plate thickness of the first metal member 1 in this embodiment. The ditch | groove 2d is formed so that the one end edge of the 1st metal member 1 can be fitted.

  As shown in FIG. 1, the butting step is performed by inserting the end surface 1a of the first metal member 1 into the groove 2d of the second metal member 2 and butting the end surface 1a against the bottom surface 2e of the groove 2d. It is a process of forming. In the butting process according to the present embodiment, the groove width of the concave groove 2d is formed to be equal to the plate thickness of the first metal member 1, and therefore the side surfaces 1b and 1c in the plate thickness direction of the first metal member 1 and the concave groove The side surfaces 2f and 2g of 2d in the groove width direction are in contact with each other, and one end edge of the first metal member 1 is fitted into the groove 2d.

  An arrangement | positioning process is a process of arrange | positioning the auxiliary member 10, as shown in FIG. The auxiliary member 10 is a plate-shaped metal member. The plate | board thickness of the auxiliary member 10 is set to the thickness which does not generate | occur | produce a metal shortage in the junction part (plasticization area | region W1) formed in the case of the friction stirring process mentioned later. In this embodiment, the auxiliary member 10 is formed of the same material as the first metal member 1 and the second metal member 2. In the arrangement step, the auxiliary member 10 is arranged on the surface 2b of the second metal member 2 at a position corresponding to the first metal member 1 and the concave groove 2d. The surface 2b of the second metal member 2 and the back surface 10b of the auxiliary member 10 are in surface contact. In the arrangement | positioning process which concerns on this embodiment, it arrange | positions in the position with which the center part of the auxiliary member 10 and the center of the plate | board thickness direction of the 1st metal member 1 substantially overlap.

  As shown in FIG. 2, the friction stirring step is a step of inserting the joining rotary tool F that rotates from the surface 10 a side of the auxiliary member 10 and friction-stir-joining the butt J1. The joining rotary tool F corresponds to a “rotary tool” in the claims. The joining rotary tool F includes a connecting portion F1 and a stirring pin F2. The connection part F1 is a part attached to a friction stirrer (not shown) and 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 in a counterclockwise direction from the proximal end toward the distal end in order to rotate the joining rotary tool F to the right.

  In addition, when rotating the rotation tool F for joining counterclockwise, it is preferable to form a spiral groove clockwise as it goes to a front-end | tip from a base 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 auxiliary member 10) can be decreased.

  In the friction stirring step, the stirring pin F2 rotated right from the surface 10a of the auxiliary member 10 is inserted. In the friction agitation step, the agitation pin F2 and the first metal member 1, the second metal member 2 and the auxiliary member 10 are in contact with each other along the abutting portion J1 from the near side to the far side in FIG. The rotation tool F is moved relatively. In the friction stirring step, friction stirring is performed with the base end side of the stirring pin F2 exposed. The rotation center axis C of the joining rotary tool F is set to a position passing through the center of the first metal member 1 in the plate thickness direction and the center of the groove 2d in the groove width direction. A plasticized region W1 is formed in the movement locus of the welding rotary tool F. The insertion depth of the stirring pin F <b> 2 may be set as appropriate, but in the present embodiment, the stirring pin F <b> 2 is set so as to contact the first metal member 1.

  In the friction stirring step, only the stirring pin F2 may be brought into contact with the second metal member 2 and the auxiliary member 10 to perform the friction stirring joining. In this case, the butt portion J1 is plastically fluidized and joined by frictional heat between the second metal member 2 and the stirring pin F2. A burr V is formed on the surface 10 a of the auxiliary member 10.

  The removal step is a step of removing the auxiliary member 10 from the second metal member 2 as shown in FIG. In the removal process, the both ends of the auxiliary member 10 are turned up, and the auxiliary member 10 is cut off so as to be bent at the groove D. The concave groove D is a portion that is deeply buried in the plasticized region W1. In the removal process, a cutting tool or the like may be used, but in this embodiment, the removal process is performed manually. Through the above steps, the first metal member 1 and the second metal member 2 are joined in a T-shape when viewed from the front.

  According to the joining method according to the present embodiment described above, only the stirring pin F2 is brought into contact with the first metal member 1, the second metal member 2, and the auxiliary member 10, or the second metal member 2 and the auxiliary member 10. Since the friction stir welding is performed in the above state, the load on the friction stirrer can be reduced as compared with the prior art. Thereby, even if the plate | board thickness of the 2nd metal member 2 is large, the butt | matching part J1 in a deep position can be joined in the state which does not apply a big load to a friction stirring apparatus.

  Moreover, since only the stirring pin F2 is inserted, the width of the plasticizing region W1 can be reduced. Thereby, since the plate | board thickness of the 1st metal member 1 can also be made small, the freedom degree of design of the 1st metal member 1 can be raised. Moreover, in addition to the 1st metal member 1 and the 2nd metal member 2, the auxiliary member 10 is also friction stir welded, and as shown in FIG. 4, the metal shortage of a junction part (plasticization area | region W1) can be prevented. .

  Furthermore, since the end surface 1a of the first metal member 1 is inserted into the concave groove 2d of the second metal member 2 and the end surface 1a is abutted against the bottom surface 2e of the concave groove 2d, the first metal member 1 and the second metal member 1 are in contact with each other during the abutting process. It is possible to prevent displacement from the metal member 2.

  Further, according to the removing step, since the burr V can be removed together with the auxiliary member 10, the surface 2b of the second metal member 2 can be finished finely without performing a separate burr removing operation. Moreover, in the friction stirring process of this embodiment, since the joining rotary tool F is inserted from the center of the surface 10a of the auxiliary member 10, the joining rotary tool F can be inserted easily.

[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, a butting process, an arranging process, a friction stirring process, and a removing process are performed. The joining method according to the second embodiment is different from the first embodiment in the arrangement position of the auxiliary member 10. The joining method according to the second embodiment will be described with a focus on the differences from the first embodiment.

  In the butting step, as shown in FIG. 5, the end surface 1a of the first metal member 1 is inserted into the groove 2d of the second metal member 2 as in the first embodiment, and the end surface 1a is used as the bottom surface 2e of the groove 2d. Butt portion J1 is formed.

  Here, as shown in FIG. 5, the planned position through which the rotation center axis C (see FIG. 6) of the welding rotary tool F passes is set as a “joining reference line X” in the friction stirring step. In this embodiment, the joining reference line X is set so as to overlap the center of the first metal member 1 in the plate thickness direction and the center of the groove 2d in the groove width direction. In the arranging step, the auxiliary member 10 is arranged on the surface 2b of the second metal member 2 only on one side with respect to the bonding reference line X, and the auxiliary member 10 is positioned at a position where the side surface 10c of the auxiliary member 10 overlaps the bonding reference line X. 10 is arranged. Note that the joining reference line X is a position where the plastic fluid material does not flow out from the inner corners of the side surfaces 1b, 1c of the first metal member 1 and the back surface 2c of the second metal member 2 in the friction stirring step described later. What is necessary is just to set suitably.

  As shown in FIG. 6, in the friction stirring step, the rotation center axis C of the rotating tool F for rotation rotated to the right is inserted at a position overlapping the welding reference line X, and the welding is performed from the near side to the far side in FIG. In this step, the rotary tool F is relatively moved and the butt J1 is friction stir welded. In the friction stirring step, as in the first embodiment, only the stirring pin F2 of the welding rotary tool F is brought into contact with the first metal member 1, the second metal member 2, and the auxiliary member 10, or the second metal member. Friction stir welding is performed in a state of contact with 2 and the auxiliary member 10.

  In the present embodiment, the auxiliary member 10 of the second metal member 2 is arranged on the shearing side (advancing side: the side on which the moving speed of the rotating tool is added to the tangential speed on the outer periphery of the rotating tool). The moving direction and the rotating direction of the welding rotary tool F are set so as to be on the non-connecting side. 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, when the rotational speed of the welding rotary tool F is low, the shear side is more plastic flow than the flow side (retreating side: the side where the moving speed of the rotary tool is subtracted from the tangential speed on the outer periphery of the rotary tool). Since the temperature of the material is likely to rise, many burrs V tend to be generated on the shear side outside the plasticized region W1. On the other hand, for example, when the rotational speed of the rotating tool F for joining is high, the temperature of the plastic fluidized material increases on the shear side, but there are more burrs V on the flow side outside the plasticizing region W1 due to the higher rotational speed. Tend to occur.

  In the present embodiment, since the rotational speed of the joining rotary tool F is set high, as shown in FIG. 7, many burrs V tend to be generated on the flow side outside the plasticizing region W1. 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.

  In the friction stirring step, which side of the traveling direction of the welding rotary tool F the burr V is generated differs depending on the joining conditions. The joining conditions include the rotational speed, the rotational direction, the traveling direction, the moving speed (feeding speed) of the joining rotary tool F, the inclination angle (taper angle) of the stirring pin F2, the metal member to be joined (first metal member 1, It is determined by each element such as the material of the second metal member 2 and the auxiliary member 10), the thickness of the metal member to be joined, and the combination of these elements. It is preferable to set the side where the burrs V are generated or the side where a large amount of burrs V is generated to be the auxiliary member 10 side according to the joining conditions because the removal step described later can be easily performed.

  The removing step is a step of removing the auxiliary member 10 from the second metal member 2. In the removal step, the auxiliary member 10 is removed by being bent as in the first embodiment. Through the above steps, the first metal member 1 and the second metal member 2 are joined.

  The bonding method according to the second embodiment described above can provide substantially the same effect as that of the first embodiment. Further, in the arrangement process according to the second embodiment, the auxiliary member 10 is arranged on one side with respect to the joining reference line X, and in the friction stirring process, the joining conditions are set so that burrs V are generated on the auxiliary member 10 side. Thereby, the burr | flash V can be concentrated on the auxiliary member 10 arrange | positioned with respect to the joining reference line X at one side. Thereby, since the burr | flash V can be removed with the auxiliary member 10, the burr | flash V can be removed easily.

[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, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. The joining method according to the third embodiment will be described with a focus on the differences from the first embodiment.

  In the butting step, as shown in FIG. 8, the end surface 1a of the first metal member 1 is inserted into the groove 2d of the second metal member 2 as in the first embodiment, and the end surface 1a is used as the bottom surface 2e of the groove 2d. Butt portion J1 is formed. Also in this embodiment, the joining reference line X is set at a position where it overlaps the center of the first metal member 1 in the plate thickness direction and the center of the groove 2d in the groove width direction. In the arranging step, the auxiliary member 10 is arranged on the surface 2b of the second metal member 2 on the other side with respect to the joining reference line X, while the side surface 10c of the auxiliary member 10 is slightly on one side with respect to the joining reference line X. The auxiliary member 10 is disposed so as to protrude. The thickness of the auxiliary member 10 and the distance from the joining reference line X to the side surface 10c are such that a metal shortage does not occur in the joining portion (plasticization region W1) in the friction stirring process described later, and one side after the friction stirring process. The auxiliary member 10 is appropriately set so as not to remain.

  In the friction agitation process, as shown in FIG. 9, the rotation center axis C of the welding rotary tool F rotated counterclockwise is inserted at a position overlapping the joining reference line X, and joined from the near side to the far side in FIG. In this step, the rotary tool F is relatively moved and the butt J1 is friction stir welded. In the friction stirring step, as in the first embodiment, only the stirring pin F2 of the welding rotary tool F is brought into contact with the first metal member 1, the second metal member 2, and the auxiliary member 10, or the second metal member. Friction stir welding is performed in a state of contact with 2 and the auxiliary member 10.

  In the present embodiment, since the joining rotary tool F is rotated counterclockwise, the burrs V tend to be formed on the flow side of the auxiliary member 10.

  In the removal step, as shown in FIG. 10, the auxiliary member 10 is removed from the second metal member 2. In the removing step, the auxiliary member 10 is bent and the auxiliary member 10 is removed from the second metal member 2.

  According to the joining method according to the third embodiment described above, it is possible to achieve substantially the same effect as that of the first embodiment. Further, according to the present embodiment, in the arranging step, the auxiliary member 10 is arranged on the other side with respect to the joining reference line X, and the side surface 10c of the auxiliary member 10 is slightly protruded on the one side. Further, in the friction stirring step, the auxiliary member 10 and the burr V do not remain on one side of the surface 2b of the second metal member 2 while the butt joint J1 is friction stir welded, and the burr V is generated on the auxiliary member 10 side. The joining conditions are set as follows. As a result, it is possible to prevent a shortage of metal in the joint portion (plasticization region W1) in a well-balanced manner and to collect the burrs V in the auxiliary member 10 disposed on the other side. Thereby, since the burr | flash V can be removed with the auxiliary member 10, the burr | flash V can be removed easily.

[Fourth embodiment]
Next, the joining method according to the fourth embodiment of the present invention will be described. In the joining method according to the fourth embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. The joining method according to the fourth embodiment is different from the first embodiment in that the groove 5 is formed by the second metal member 3 and the third metal member 4. The joining method according to the fourth embodiment will be described with a focus on the differences from the first embodiment.

  As shown in FIG. 11, the first metal member 1, the second metal member 3, and the third metal member 4 are all plate-shaped. The first metal member 1, the second metal member 3, and the third metal member 4 are appropriately selected from friction stir metals such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. . The plate thickness dimensions of the first metal member 1, the second metal member 3, and the third metal member 4 may be set as appropriate.

  The second metal member 3 has an end surface 3c facing the third metal member 4, a surface 3a continuous with the end surface 3c and extending in a direction orthogonal to the end surface 3c, and extending in a direction orthogonal to the end surface 3c. It has a back surface 3b, and a first notch 3d formed by cutting out a corner formed by the back surface 3b and the end surface 3c. The third notches 3d are open on the first metal member 1 side and the third metal member 4 side. The first notch 3d has a first notch bottom 3e and a first notch side 3f. The first bottom surface 3e is continuous with the end surface 3c and extends in a direction orthogonal thereto. The first notch side surface 3f is formed between the first notch bottom surface 3e and the back surface 3b, and extends in a direction orthogonal to the first notch bottom surface 3e and the back surface 3b.

  The third metal member 4 includes an end surface 4c facing the end surface 3c, a surface 4a continuous with the end surface 4c and extending in a direction orthogonal to the end surface 4c, and a back surface 4b extending in a direction orthogonal to the end surface 4c. And a second cutout portion 4d formed by cutting out a corner portion formed by the back surface 4b and the end surface 4c. The 2nd notch part 4d is opened to the 1st metal member 1 side and the 2nd metal member 3 side. The second cutout portion 4d has a second cutout bottom surface 4e and a second cutout side surface 4f. The second notch bottom surface 4e is continuous with the end surface 4c and extends in a direction orthogonal thereto. The second notch side surface 4f is formed between the second notch bottom surface 4e and the back surface 4b, and extends in a direction orthogonal to the second notch bottom surface 4e and the back surface 4b. The first notch part 3d and the second notch part 4d are formed symmetrically with respect to the joining reference line X (in this embodiment, an extension line of the first abutting part J2).

  The first notch 3d and the second notch 4d constitute a single concave groove 5 in a state where the end face 3c and the end face 4c are in contact with each other. The first notch bottom surface 3 e and the second notch bottom surface 4 e constitute the bottom surface 5 a of the groove 5. The first notch side surface 3f constitutes one side surface 5b of the groove 5 and the second notch side surface 4f constitutes the other side surface 5c of the groove 5. The concave groove 5 opens to the first metal member 1 side. The concave groove 5 has a rectangular cross section corresponding to the shape of the first metal member 1. The groove width of the concave groove 5 is formed to be equal to the plate thickness of the first metal member 1 in this embodiment. The concave groove 5 is formed so that one end edge of the first metal member 1 can be fitted.

  In the butting step, first, the end surface 3c of the second metal member 3 and the end surface 4c of the third metal member 4 are butted to form the first butting portion J2. In this way, a single and rectangular recess groove 5 is formed across the second metal member 3 and the third metal member 4 by the first notch 3d and the second notch 4d. Next, the end surface 1a of the first metal member 1 is inserted into the concave groove 5 of the second metal member 3 and the third metal member 4, and the end surface 1a is abutted against the bottom surface 5a of the concave groove 5 so that the second abutting portion J3 ( 12). In the butting process according to the present embodiment, the groove width of the groove 5 is formed to be equal to the plate thickness of the first metal member 1, and therefore the side surfaces 1b and 1c in the plate thickness direction of the first metal member 1 and the groove The side surfaces 5b and 5c in the groove width direction 5 are in contact with each other, and one end edge of the first metal member 1 is fitted into the groove 5.

  In the arranging step, the auxiliary member 10 is arranged so as to straddle the surface 3 a of the second metal member 3 and the surface 4 a of the third metal member 4. In the present embodiment, the auxiliary member 10 is formed of the same material as the first metal member 1, the second metal member 3, and the third metal member 4. In the placement step, the auxiliary member 10 is placed at a position corresponding to the first metal member 1 and the groove 5 on the surface 3 a of the second metal member 3 and the surface 4 a of the third metal member 4. In the arrangement | positioning process which concerns on this embodiment, it arrange | positions in the position where the center part of the auxiliary member 10, the center of the plate | board thickness direction of the 1st metal member 1, and the 1st butt | matching part J2 substantially overlap.

  As shown in FIG. 12, the friction stirring step is a step of inserting the rotating tool F for rotation rotating from the surface 10a side of the auxiliary member 10 and friction stir welding the first butting portion J2 and the second butting portion J3. .

  In the friction stirring step, the stirring pin F2 rotated right from the surface 10a of the auxiliary member 10 is inserted. In the friction stir process, the first stirrer F2 and the first metal member 1, the second metal member 3, the third metal member 4 and the auxiliary member 10 are in contact with each other from the near side to the far side in FIG. The joining rotary tool F is relatively moved along the butting portion J2 and the second butting portion J3. In the friction stirring step, friction stirring is performed with the base end side of the stirring pin F2 exposed. The rotation center axis C of the rotating tool F for joining is set to a position passing through the center of the first metal member 1 in the plate thickness direction, the center of the groove 5 in the groove width direction, and the first butting portion J2. A plasticized region W1 is formed in the movement locus of the welding rotary tool F. The insertion depth of the stirring pin F <b> 2 may be set as appropriate, but in the present embodiment, the stirring pin F <b> 2 is set so as to contact the first metal member 1.

  In the friction stirring step, only the stirring pin F2 may be brought into contact with only the second metal member 3, the third metal member 4, and the auxiliary member 10 to perform the friction stir welding. In this case, the second butted portion J3 is plastically fluidized and joined by frictional heat between the second metal member 3, the third metal member 4, and the stirring pin F2. A burr V is formed on the surface 10 a of the auxiliary member 10.

  The removal process is a process of removing the auxiliary member 10 from the second metal member 3 and the third metal member 4 as shown in FIG. In the removal process, the both ends of the auxiliary member 10 are turned up, and the auxiliary member 10 is cut off so as to be bent at the groove D. The concave groove D is a portion that is deeply buried in the plasticized region W1. In the removal process, a cutting tool or the like may be used, but in this embodiment, the removal process is performed manually. Through the above steps, as shown in FIG. 14, the first metal member 1, the second metal member 3, and the third metal member 4 are joined in a T shape when viewed from the front.

  The bonding method according to the fourth embodiment described above can also provide substantially the same effect as the first embodiment. That is, to insert the end surface 1a of the first metal member 1 into the concave groove 5 formed by abutting the second metal member 3 and the third metal member 4, and abut the end surface 1a to the bottom surface 5a of the concave groove 5, It is possible to prevent displacement of the first metal member 1, the second metal member 3, and the third metal member 4 during the butting process.

[Fifth embodiment]
Next, the joining method according to the fifth embodiment of the present invention will be described. In the joining method according to the fifth embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. The joining method according to the fifth embodiment is different from the fourth embodiment in the arrangement position of the auxiliary member 10. The joining method according to the fifth embodiment will be described with a focus on the differences from the fourth embodiment.

  In the butting step, as shown in FIG. 15, the first butting portion J2 is formed by butting the end surface 3c of the second metal member 3 and the end surface 4c of the third metal member 4 as in the fourth embodiment. In this way, a single and rectangular recess groove 5 is formed across the second metal member 3 and the third metal member 4 by the first notch 3d and the second notch 4d. Next, the end face 1a of the first metal member 1 is inserted into the groove 5 of the second metal member 3 and the third metal member 4, the end face 1a is butted against the bottom face 5a of the groove 5, and the second butted portion J3 is formed. Form.

Here, as shown in FIG. 15, the planned position through which the rotation center axis C of the rotating tool for welding F (see FIG. 11) passes is set as a “joining reference line X” during the friction stirring step. In the present embodiment, the joining reference line X is set so as to overlap the center of the first metal member 1 in the plate thickness direction, the center of the groove 5 in the groove width direction, and the first butted portion J2. In the arranging step, the auxiliary member 10 is arranged on the surface 4a of the third metal member 4 only on one side with respect to the first abutting portion J2, and the side surface 10c of the auxiliary member 10 overlaps the first abutting portion J2. The auxiliary member 10 is disposed. In the arrangement step, the auxiliary member 10 may be arranged on the surface 3a of the second metal member 3 only on the other side with respect to the first abutting portion J2.
The friction stirring step and the removing step according to the present embodiment are performed by a method substantially similar to that of the second embodiment described above.

The bonding method according to the fifth embodiment described above can also provide substantially the same effect as that of the fourth embodiment. That is, to insert the end surface 1a of the first metal member 1 into the concave groove 5 formed by abutting the second metal member 3 and the third metal member 4, and abut the end surface 1a to the bottom surface 5a of the concave groove 5, It is possible to prevent displacement of the first metal member 1, the second metal member 3, and the third metal member 4 during the butting process.
In addition, the joining method according to the fifth embodiment can provide substantially the same effect as the second embodiment. That is, in the arrangement step according to the fifth embodiment, the auxiliary member 10 is arranged on the surface 4a of the third metal member 4 on one side with respect to the first abutting portion J2, and in the friction stirring step, the burr V is formed on the auxiliary member 10 side. Joining conditions were set to occur. Thereby, the burr | flash V can be concentrated on the auxiliary member 10 arrange | positioned on the one side with respect to the 1st butt | matching part J2. Thereby, since the burr | flash V can be removed with the auxiliary member 10, the burr | flash V can be removed easily.

[Sixth embodiment]
Next, the joining method according to the sixth embodiment of the present invention will be described. In the joining method according to the sixth embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. The joining method according to the sixth embodiment is different from the fourth embodiment in the arrangement position of the auxiliary member 10. The joining method according to the sixth embodiment will be described with a focus on the differences from the fourth embodiment.

  In the butting step, as shown in FIG. 16, the end face 3c of the second metal member 3 and the end face 4c of the third metal member 4 are abutted to form the first abutting portion J2 as in the fourth embodiment. In this way, a single and rectangular recess groove 5 is formed across the second metal member 3 and the third metal member 4 by the first notch 3d and the second notch 4d. Next, the end face 1a of the first metal member 1 is inserted into the groove 5 of the second metal member 3 and the third metal member 4, the end face 1a is butted against the bottom face 5a of the groove 5, and the second butted portion J3 is formed. Form. Also in this embodiment, the joining reference line X is set at a position where the center of the first metal member 1 in the plate thickness direction, the center of the groove 5 in the groove width direction, and the first butted portion J2 overlap.

In the arranging step, the auxiliary member 10 is arranged on the surface 3a of the second metal member 3 on the other side with respect to the first butting portion J2, and the side surface 10c of the auxiliary member 10 is on one side with respect to the first butting portion J2. The auxiliary member 10 is arranged so as to slightly protrude from the third metal member 4. The thickness of the auxiliary member 10 and the distance from the joining reference line X to the side surface 10c are such that no shortage of metal occurs in the joining portion (plasticization region W1) in the friction stirring process, and assistance is provided on one side after the friction stirring process. It sets suitably so that the member 10 may not remain | survive. In the arranging step, the auxiliary member 10 is arranged on the surface 4a of the third metal member 4 on one side with respect to the first abutting portion J2, while the side surface 10c of the auxiliary member 10 is on the other side with respect to the first abutting portion J2. The auxiliary member 10 may be disposed so as to slightly protrude from the second metal member 3 on the side.
The friction stirring step and the removal step according to the present embodiment are performed by a method substantially similar to that of the third embodiment described above.

The bonding method according to the sixth embodiment described above can also provide substantially the same effect as that of the fourth embodiment. That is, to insert the end surface 1a of the first metal member 1 into the concave groove 5 formed by abutting the second metal member 3 and the third metal member 4, and abut the end surface 1a to the bottom surface 5a of the concave groove 5, It is possible to prevent displacement of the first metal member 1, the second metal member 3, and the third metal member 4 during the butting process.
In addition, the joining method according to the sixth embodiment can provide substantially the same effect as that of the third embodiment. That is, in the arranging step, the auxiliary member 10 is arranged on the surface 4a of the third metal member 4 on one side while the auxiliary member 10 is arranged on the surface 3a of the second metal member 3 on the other side with respect to the first butting portion J2. The side surface 10c is slightly protruded. In the friction stirring step, the auxiliary member 10 and the burr V do not remain on the surface 4a of the third metal member 4 on one side while the first butting portion J2 and the second butting portion J3 are friction stir welded, and the auxiliary member The joining conditions are set so that burrs V are generated on the 10 side. As a result, it is possible to prevent a shortage of metal in the joint portion (plasticization region W1) in a well-balanced manner and to collect the burrs V in the auxiliary member 10 disposed on the other side. Thereby, since the burr | flash V can be removed with the auxiliary member 10, the burr | flash V can be removed 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 2,3 2nd metal member 4 3rd metal member 10 Auxiliary member 1a End surface 2d, 5 Concave groove 2e, 5a Bottom surface 3b Back surface 3d First notch part 4b Back surface 4d Second notch part F Rotating tool F1 Connecting portion F2 Stirring pin J1 Butting portion J2 First butting portion J3 Second butting portion W1 Plasticization 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 inserting an end face of the first metal member into the recessed groove of the second metal member having a recessed groove on the back surface and butting the end face against the bottom surface of the recessed groove; and
An arranging step of arranging an auxiliary member at a position corresponding to the first metal member of the surface of the second metal member;
The rotating stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin contacts the second metal member and the auxiliary member, or the first metal member, the second metal member, and the auxiliary member. A friction stir process in which the rotating tool is moved relative to each other in a state of being brought into friction stir welding.   The joining method according to claim 1, further comprising a removing step of removing the auxiliary member formed with burrs from the second metal member.   The joining method according to claim 1 or 2, wherein in the friction stirring step, the stirring pin is inserted into a central portion of the auxiliary member. In the case of the friction stirring step, when the planned position through which the rotation center axis of the rotary tool passes is set as a joining reference line,
In the arrangement step, the auxiliary member is arranged only on one side with respect to the joining reference line,
The joining method according to claim 2, wherein in the friction stirring step, joining conditions are set so that the burrs are generated in the auxiliary member. In the case of the friction stirring step, when the planned position through which the rotation center axis of the rotary tool passes is set as a joining reference line,
In the arrangement step and the friction stirring step, the auxiliary member is arranged to straddle the joining reference line,
Setting the position and joining conditions of the auxiliary member so that the burr is generated in the auxiliary member on one side with respect to the joining reference line, and the auxiliary member does not remain on the other side after the friction stirring step. The bonding method according to claim 2. A joining method for joining the first metal member, the second metal member, and the third metal member using a rotary tool equipped with a stirring pin,
The end face of the second metal member having a plate shape and notched corners on the back surface and the end surface of the third metal member having a plate shape and notched corners on the back surface are abutted with each other to form a groove and a first groove. A butting step of forming a butting portion and inserting a plate-like end surface of the first metal member into the groove and butting the end surface against the bottom surface of the groove to form a second butting portion;
An arranging step of arranging an auxiliary member at a position corresponding to the first metal member among the surfaces of the second metal member and the third metal member;
Friction that inserts the stirring pin of the rotary tool from the surface side of the auxiliary member and relatively moves the rotary tool along the concave groove to friction stir weld the first butting portion and the second butting portion. A stirring step,
In the friction stirring step, only the stirring pin is applied to the second metal member, the third metal member, and the auxiliary member, or the second metal member, the third metal member, the first metal member, and the auxiliary member. The joining method, wherein the first butted portion and the second butted portion are friction stir welded in a contact state.   The joining method according to claim 6, further comprising a removing step of removing the auxiliary member formed with burrs from the second metal member and the third metal member.   The joining method according to claim 6 or 7, wherein in the friction stirring step, the stirring pin is inserted into a central portion of the auxiliary member. In the arranging step, the auxiliary member is arranged only on one side with respect to the first butting portion,
The joining method according to claim 7, wherein in the friction stirring step, joining conditions are set so that the burrs are generated in the auxiliary member. In the arrangement step and the friction stirring step, the auxiliary member is arranged so as to straddle the first abutting portion,
The position of the auxiliary member and the joining condition are set so that the burr is generated in the auxiliary member on one side with respect to the first butting portion, and the auxiliary member does not remain on the other side after the friction stirring step. The bonding method according to claim 7.

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