JP2018176206A - Joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining method that can prevent shortage of metal of a joining part.SOLUTION: A joining method includes: a superposing step in which one surface 11 of a first metal member 10 is superposed on an outer corner part 24 of a second metal member 20 to form a superposed part; an auxiliary member arrangement step in which a back surface 31 of an auxiliary member 30 having an L-shaped cross section is brought into surface-contact with an inner corner part 25 of the second metal member 20 so as to cover the inner corner part 25, and the auxiliary member 30 is arranged; a final joining step in which a stirring pin F2 is inserted from a front surface side 32 of the auxiliary member 30, and a rotary tool F for final joining is moved along the superposed part J, in a state that only the stirring pin F2 is brought into contact with the auxiliary member 30, the first metal member 10 and the second metal member 20, and the auxiliary member 30, the first metal member 10 and the second metal member 20 are subjected to friction stir welding; and a removing step in which the auxiliary member 30 having burr formed therein is removed from the second metal member 20.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a bonding method of bonding metal members by friction stirring.

  For example, Patent Document 1 discloses a bonding method of bonding a first metal member and a second metal member by friction stirring. In the joining method, after the first metal member and the second metal member are butted to form a butt portion, only the stirring pin of the rotary tool is brought into contact with the first metal member and the second metal member. In contrast, friction stirring is performed.

JP, 2013-39613, A

  With the conventional joining method, the plastically fluidized metal is not held by the shoulder portion of the rotary tool, so there is a problem that the plastically fluidized metal overflows to the outside and the joint becomes metal-deficient.

  On the other hand, there are cases where friction stir welding is performed between the first metal member formed of a flat plate and the second metal member formed of a bent plate having an L-shaped cross section. Is not disclosed.

  Therefore, in the present invention, when friction stir welding a first metal member made of a flat plate material and a second metal member made of a bent plate material having an L-shaped cross section, the metal of the joint portion An object is to provide a bonding method that can prevent shortage.

  A first aspect of the present invention for solving the above-mentioned problems is a bonding method in which a first metal member and a second metal member are bonded by friction stirring using a rotary tool for main bonding provided with a stirring pin, The first metal member is formed of a flat plate material, and the second metal member is provided with a first plate portion and a second plate portion bent from the first plate portion. A lamination step of forming a superposed portion by laminating one surface of the first metal member and the outer corner portion of the second metal member, which is formed of a plate material, and the inside of the second metal member An auxiliary member disposing step of arranging the auxiliary member on the second metal member by bringing the back surface of the auxiliary member having an L-shaped cross section into surface contact with the corner so as to cover the inner corner; Insert from the surface side of the auxiliary member, and only the stirring pin is the auxiliary member, the first metal portion And moving the rotating tool for main bonding along the overlapping portion in a state of being in contact with the second metal member or the auxiliary member and the second metal member, the auxiliary member, the first metal member, and It is a bonding method characterized by including: a main bonding step of performing friction stir welding of the second metal member; and a removing step of removing the auxiliary member on which the burr is formed from the second metal member.

  A second invention of the present invention for solving the above-mentioned problems is a bonding method of bonding a first metal member and a second metal member by friction stirring using a rotary tool for main bonding provided with a stirring pin, The first metal member is formed of a flat plate-shaped plate, and the second metal member includes a first plate portion and a second plate portion bent from the first plate portion, and is bent in an L-shaped cross section. A lamination step of forming a superposed portion by laminating one surface of the first metal member and the outer corner portion of the second metal member, which is formed of a plate material, and the inside of the second metal member The back surface of the flat auxiliary member is brought into surface contact with the front surface of any one of the first plate portion and the second plate portion at the corner, and the other of the first plate portion and the second plate portion The end portion of the auxiliary member is butted against the surface, and the auxiliary portion is moved to the second metal member. And the stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin is used as the auxiliary member, the first metal member and the second metal member, or the auxiliary member and the auxiliary member. In the state of being in contact with the second metal member, the main joint for moving the auxiliary welding member, the first metal member, and the second metal member by moving the rotary tool for main welding along the overlapping portion to perform friction stir welding It is a bonding method characterized by including the process and the removal process of removing the said auxiliary member in which the burr was formed from the said 2nd metal member.

  According to the bonding method of the first and second aspects of the present invention, the first metal member composed of a flat plate material and the second metal member composed of a bent plate material having an L-shaped cross section are joined In addition to the first metal member and the second metal member, the auxiliary members are also friction stir welded at the same time, whereby metal shortage of the joint can be prevented. Further, by performing the friction stir welding in a state where only the stirring pin is in contact with the metal member in the main bonding step, the load acting on the friction stir device can be reduced. Furthermore, since the burrs can be removed together with the auxiliary members, the removal process becomes easy.

  In the invention, before the auxiliary member disposing step, only the stirring pin of the rotating tool for temporary bonding is inserted into the inner corner portion of the second metal member, and the first metal member and the second metal member are spotted. It is preferable to further include a temporary joining step of performing friction stir welding of the metal members. According to such a bonding method, the load acting on the friction stir device can be reduced by inserting only the stirring pin into the metal member and performing temporary bonding with spots. In addition, the process time can be shortened as compared with the case where temporary bonding is performed on the entire length of the polymerization portion.

  Furthermore, in the above-mentioned invention, it is preferred that the main welding rotary tool and the temporary welding rotary tool are the same rotary tool. According to such a joining method, since it is not necessary to replace the rotating tool, working efficiency can be enhanced.

  Moreover, in the said invention, it is a temporary joining process of welding by a spot from the said inner corner part side of the said 2nd metal member, and joining the said 1st metal member and the said 2nd metal member before the said auxiliary member arrangement | positioning process Is preferably further included. According to such a joining method, it is possible to reduce the load acting on the friction stirring device by performing spot welding and performing temporary joining, compared to the case where the temporary joining is performed by friction stirring. Furthermore, the process time can be shortened as compared with the case where temporary bonding is performed for the entire length of the polymerization portion.

  Furthermore, in the above invention, the welding is preferably MIG welding, TIG welding or laser welding.

  A third aspect of the present invention for solving the above-mentioned problems is a bonding method in which a first metal member and a second metal member are bonded by friction stirring using a rotary tool for main bonding provided with a stirring pin, The first metal member is formed of a flat plate material, and the second metal member is provided with a first plate portion and a second plate portion bent from the first plate portion. A lamination step of forming a superposed portion by laminating one surface of the first metal member and the outer corner portion of the second metal member, which is formed of a plate material, and the outside of the second metal member An auxiliary member disposing step of arranging the auxiliary member on the first metal member by surface-contacting the back surface of the flat auxiliary member so as to cover the other surface of the first metal member at a position corresponding to a corner; Inserting the stirring pin from the surface side of the auxiliary member, and only the stirring pin In the state in which the auxiliary member, the first metal member and the second metal member, or the auxiliary member and the first metal member are in contact with each other, the main bonding rotating tool is moved along the overlapping portion to perform the auxiliary Including a main joining step of performing friction stir welding of the member, the first metal member and the second metal member, and a removing step of removing the auxiliary member on which the burr is formed from the first metal member It is a bonding method to be characterized.

  According to the bonding method of the third aspect of the present invention, the first metal member formed of a flat plate material and the second metal member formed of a bent plate material having an L-shaped cross section are joined together In addition to the first metal member and the second metal member, the auxiliary members are also friction stir welded at the same time, so that the metal shortage of the joint can be prevented. Further, by performing the friction stir welding in a state where only the stirring pin is in contact with the metal member in the main bonding step, the load acting on the friction stir device can be reduced. Furthermore, since the burrs can be removed together with the auxiliary members, the removal process becomes easy.

  In the auxiliary member arranging step, the auxiliary member is arranged such that the auxiliary member spreads on both sides centering on the overlapping portion in the auxiliary member arranging step, and in the main joining step, the stirring is performed at a central portion of the auxiliary member. It is preferable to insert a pin. According to such a joining method, since the auxiliary members are located on both sides of the stirring pin, more metal can be supplied.

  Furthermore, in the above invention, in a case where a line passing through the end face of the auxiliary member and orthogonal to the first metal member is used as a reference line, in the auxiliary member disposing step, the reference line is an outer corner portion of the second metal member. The auxiliary member is disposed to pass through, and in the main bonding step, the stirring pin is moved so that the central axis of rotation of the rotary tool for main bonding and the reference line overlap, and a burr is attached to the auxiliary member It is preferable to set the bonding conditions so as to be formed. According to such a joining method, material loss of the auxiliary member can be reduced.

  Further, in the above-mentioned invention, when a line passing through the end face of the auxiliary member and orthogonal to the first metal member is used as a reference line, in the auxiliary member disposing step, the second metal is formed on the other surface of the first metal member. While the auxiliary member is placed on any one of the first plate side and the second plate side sandwiching the position corresponding to the outer corner of the member, the end of the auxiliary member corresponds to the outer corner The auxiliary member is disposed so as to protrude to the other side of the first plate portion side and the second plate portion side with the position to be interposed, and the main bonding step is performed after the main bonding step is performed. The stirring pin is moved by shifting the central axis of rotation of the main welding tool to the center of the auxiliary member with respect to the reference line so that the auxiliary member remains on only one side of the main welding rotary tool. And burrs are formed on the remaining auxiliary members It is preferable to set the welding conditions to so that. According to such a bonding method, the material loss of the auxiliary member can be reduced while supplying more metal.

  Moreover, the said invention inserts only the stirring pin of the rotating tool for temporary joining in the other surface of the said 1st metal member of the position corresponding to the outer corner part of the said 2nd metal member before the said auxiliary member arrangement | positioning process It is preferable to further include a temporary joining step of performing friction stir welding of the first metal member and the second metal member by a spot. According to such a bonding method, the load acting on the friction stir device can be reduced by inserting only the stirring pin into the metal member and performing temporary bonding with spots. In addition, the process time can be shortened as compared with the case where temporary bonding is performed on the entire length of the polymerization portion.

  Furthermore, in the above invention, preferably, the main welding rotary tool and the temporary welding rotary tool are the same rotary tool. According to such a joining method, since it is not necessary to replace the rotating tool, working efficiency can be enhanced.

  In the invention, before the auxiliary member disposing step, welding is performed with a spot on the other surface of the first metal member at a position corresponding to the outer corner of the second metal member, and the first metal member It is preferable to further include a temporary joining step of joining the second metal member. According to such a joining method, it is possible to reduce the load acting on the friction stirring device by performing spot welding and performing temporary joining, compared to the case where the temporary joining is performed by friction stirring. Furthermore, the process time can be shortened as compared with the case where temporary bonding is performed for the entire length of the polymerization portion.

  Furthermore, in the above invention, the welding is preferably MIG welding, TIG welding or laser welding.

  According to the bonding method of the present invention, when friction stir welding is performed between the first metal member formed of a flat plate material and the second metal member formed of a bent plate material having an L-shaped cross section, It is possible to prevent metal shortage of the joint.

It is a perspective view which shows the overlapping process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the temporary joining process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the modification of the temporary joining process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the auxiliary member arrangement | positioning process of the joining method concerning 1st embodiment. It is sectional drawing which shows this joining process of the joining method concerning 1st embodiment. It is a sectional view showing before the removal process of the joining method concerning a first 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 auxiliary member arrangement | positioning process of the joining method concerning 2nd embodiment. It is sectional drawing which shows this joining process of the joining method concerning 2nd embodiment. It is sectional drawing which shows before the removal process of the joining method concerning 2nd embodiment. It is sectional drawing which shows the removal process of the joining method concerning 2nd embodiment. It is a perspective view which shows the overlapping process of the joining method which concerns on 3rd embodiment. It is a perspective view which shows the temporary joining process of the joining method which concerns on 3rd embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process of the joining method concerning 3rd embodiment. It is sectional drawing which shows this joining process of the joining method concerning 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 after the removal process of the joining method concerning 3rd embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process of the joining method concerning 4th embodiment. It is sectional drawing which shows this joining process of the joining method concerning 4th embodiment. It is sectional drawing which shows the removal process of the joining method concerning 4th embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process of the joining method concerning 5th embodiment. It is sectional drawing which shows after this joining process of the joining method concerning 5th embodiment.

First Embodiment
The bonding method according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8. The present invention is a method of joining a first metal member made of a flat plate material and a second metal member made of a bent plate material having an L-shaped cross section. When the outer corner portion of the second metal member is joined to the first metal member, the cross section becomes substantially K-shaped. In the first embodiment, a case where friction stir welding is performed by inserting a stirring pin from the second metal member side will be described as an example. The bonding method according to the first embodiment performs a stacking process, a temporary bonding process, an auxiliary member arranging process, a main bonding process, and a removing process.

  In the overlapping step, as shown in FIG. 1, one surface 11 of the flat plate-shaped first metal member 10 and the outer corner portion 24 of the second metal member 20 having an L-shaped cross section are overlapped to overlap It is a process of forming J. The 1st metallic member 10 and the 2nd metallic member 20 consist of metal plate-like members. The material of the first metal member 10 and the second metal member 20 is appropriately selected from, for example, friction stirtable metals such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy.

  The first metal member 10 is a plate-shaped member formed in a rectangular planar shape. The second metal member 20 is bonded to one surface 11 of the first metal member 10.

  The second metal member 20 is a bent plate-shaped member having an L-shaped axial cross section. The second metal member 20 includes a first plate portion 21 and a second plate portion 22 bent from the first plate portion 21. The second plate portion 22 is orthogonal to the end portion of the first plate portion 21 continuously. In addition, the bending angle of the 1st board part 21 and the 2nd board part 22 is not limited to a right angle, An obtuse angle may be sufficient and an acute angle may be sufficient. The outer corner portion 24 which is the outer side of the corner portion 23 configured by the first plate portion 21 and the second plate portion 22 has a curved surface curved in an arc shape.

  In the overlapping step, the first metal member 10 is disposed horizontally, and the second metal member 20 is disposed on the surface 11 on one side (upper side) of the first metal member 10. The outer corner 24 of the second metal member 20 is placed on the first metal member 10 with the outer corner 24 down. At this time, the angle formed by the first metal member 10 and the first plate portion 21 of the second metal member 20 and the angle formed by the first metal member 10 and the second plate portion 22 of the second metal member 20 are both Make it 45 degrees. As described above, in the overlapping step, when the outer corner portion 24 of the second metal member 20 is overlapped on the surface 11 of the first metal member 10, the overlapping portion J is formed. At this time, gaps S, S are formed between the surface 11 of the first metal member 10 and the outer corner 24 of the second metal member 20. The first metal member 10 and the second metal member 20 are both temporarily fixed by a fixing jig (not shown).

  In the temporary bonding step, as shown in FIG. 2, in the step of performing temporary bonding to the overlapping portion J of the first metal member 10 and the second metal member 20 using a rotating tool F (rotation tool for temporary bonding) is there. The rotating tool F is formed of, for example, a tool steel. The rotating tool F includes a connecting portion F1 and a stirring pin F2. The connection portion F1 is a portion connected to the rotation shaft of the friction stir device. The connecting portion F1 has a cylindrical shape. The rotary tool F is preferably attached to an arm robot (not shown) having a rotary drive means such as a spindle unit at its tip. Thereby, temporary joining of spots can be easily performed.

The stirring pin F2 extends from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it separates from the connecting portion F1. A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In the first embodiment, in order to rotate the rotation tool F to the right, the spiral groove is formed in a counterclockwise direction from the proximal end to the distal end.
In addition, when rotating the rotation tool F to the left, it is preferable to form a spiral groove rightward as it goes to a tip from a base end.

  By setting the spiral groove in this manner, the plastically fluidized metal is guided to the tip side of the stirring pin F2 by the spiral groove during friction stirring. Thereby, the quantity of the metal which overflows to the exterior of a to-be-joined metal member (The 1st metal member 10, the 2nd metal member 20, and the auxiliary member 30) can be decreased. The spiral groove may be omitted.

  In the temporary bonding step, only the stirring pin F2 of the rotated rotating tool F is inserted into the inner corner 25 of the second metal member 20, and the tip of the stirring pin F2 is brought into contact with the overlapping portion J to perform temporary bonding with spots. Do. In the temporary bonding step, only the stirring pin F2 is shallowly inserted into the overlapping portion J (a depth that the tip of the stirring pin F2 reaches the surface 11 of the first metal member 10) at predetermined intervals. A plasticization region W0 is formed in the pressing mark of the stirring pin F2.

  Although temporary joining is performed by performing friction stir welding using rotary tool F (rotation tool for temporary joining) in the temporary joining process of this embodiment, it is not limited to this. As shown in FIG. 3, temporary bonding may be performed by welding from the inner corner 25 side of the second metal member 20. The type of welding is not particularly limited, and can be performed by arc welding such as MIG welding or TIG welding or laser welding, for example. In FIG. 3, laser welding is illustrated. In this case, welding is performed with spots at predetermined intervals while bringing the welding torch H close to the inner corner 25. At this time, the welding torch H is vertically disposed so that the tip of the welding torch H faces the inner corner 25. Welding marks W are formed in the portions where spot welding is performed.

  The auxiliary member arranging step is a step of arranging the auxiliary member 30 in the inner corner portion 25 of the second metal member 20 as shown in FIG. The auxiliary member 30 is a grooved member having an L-shaped cross section. The auxiliary member 30 is a plate member made of metal. The auxiliary member 30 is not particularly limited as long as it is a friction stir metal, but in the first embodiment, the auxiliary member 30 is made of the same material as the first metal member 10 and the second metal member 20. The thickness of the auxiliary member 30 is appropriately set so that the plasticized area W1 does not run short of metal after the main bonding step described later. In the first embodiment, the thickness of the auxiliary member 30 is set smaller than the thickness of the first metal member 10 and the second metal member 20.

  In the auxiliary member disposing step, the back surface 31 which is the outer corner side surface of the auxiliary member 30 is brought into surface contact so as to cover the inner corner portion 25 of the second metal member 20. At this time, the auxiliary member 30 straddles both the first plate portion 21 and the second plate portion 22 with the inner corner portion 25 of the second metal member 20 as a center.

  The main bonding step is a step of performing friction stir welding of the first metal member 10 and the second metal member 20 by using a rotary tool F (a rotary tool for main bonding) as shown in FIG. In the present embodiment, the same rotating tool F is used as the main bonding rotating tool and the temporary bonding rotating tool. In this bonding step, the rotation tool F rotated right is inserted from the surface 32 (surface opposite to the back surface 31) side of the auxiliary member 30, and the insertion depth of the stirring pin F2 is set to reach the overlapping portion J. Do.

  In this bonding step, friction stir welding is performed in a state where only the stirring pin F2 is in contact with the auxiliary member 30, the second metal member 20 and the first metal member 10, and the base end side of the stirring pin F2 is exposed. Then, the rotary tool F is moved along the overlapping portion J. Thereby, in the overlapping portion J, the auxiliary member 30, the first metal member 10, and the second metal member 20 are friction stir welded. In the movement trajectory of the rotary tool F, a plasticization area W1 is formed.

  After the main joining step, as shown in FIG. 6, the auxiliary member 30 is divided into the first plate portion 21 and the second plate portion 22 side by the plasticizing region W1. Further, burrs V and V are formed at the end portions of the divided auxiliary members 30 and 30, respectively.

  The removing step is a step of removing the burrs V from the second metal member 20, as shown in FIG. In the removing step, the auxiliary member 30 is removed from the second metal member 20 by bending the auxiliary member 30 away from the first plate portion 21 and the second plate portion 22 manually, for example. Since the burrs V are integrated with the auxiliary member 30, the burrs V are also removed by removing the auxiliary member 30.

  According to the joining method according to the first embodiment described above, as shown in FIG. 8, the first metal member 10 and the second metal member 20 are joined, and the first metal member 10 and the second metal member In addition to 20, by simultaneously performing the friction stir welding on the auxiliary member 30 as well, it is possible to prevent the metal shortage of the joint portion (plasticized area W1).

  In addition, friction stir welding is performed in a state where only the stirring pin F2 of the rotary tool F is in contact with the auxiliary member 30, the first metal member 10 and the second metal member 20, thereby reducing the load acting on the friction stirring device be able to.

  Further, in the bonding method according to the first embodiment, as shown in FIG. 5, only the stirring pin F2 of the rotary tool F is brought into contact with the metal member for friction stirring in the main bonding step and the temporary bonding step. The amount of heat input can be reduced, and the thermal distortion of the first metal member 10 and the second metal member 20 can be reduced.

  Further, in the bonding method according to the first embodiment, as shown in FIG. 4, the auxiliary member 30 is disposed at the inner corner 25, and the auxiliary member 30, the first metal member 10 and the second metal member 20 are simultaneously friction stirred. Because of the bonding, metal shortage of the inner corner 25 can be compensated.

  Further, in the bonding method according to the first embodiment, as shown in FIG. 6, the burrs V and V are formed on the auxiliary member 30 in the main bonding step, but as shown in FIG. Can be removed together with the auxiliary member 30. Thereby, the process of removing the burrs V can be easily performed. The auxiliary member 30 may be removed using a removing device or the like, but in the first embodiment, the auxiliary member 30 can be easily removed manually.

  Moreover, in the bonding method according to the first embodiment, since the temporary bonding step is performed, it is possible to prevent the opening of the overlapping portion J when performing the main bonding step.

  Moreover, in the bonding method according to the first embodiment, as shown in FIG. 2, the friction stir is performed by performing spot temporary bonding of the overlapping portion J in a state where only the stirring pin F2 of the rotating tool F is in contact with the metal member. The load acting on the device can be reduced. In addition, the process time can be shortened as compared with the case where temporary bonding is performed on the entire length of the polymerization portion.

  Further, in the first embodiment, the rotary tool F (rotational tool for temporary bonding) performing the temporary bonding step and the rotary tool F (rotational tool for main bonding) performing the main bonding step are the same. Since there is no need to replace the rotating tool in each process, working efficiency can be improved.

  Although the first embodiment of the present invention has been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, a rotating tool provided with a shoulder portion and a stirring pin may be used as a temporary bonding rotating tool or a main bonding rotating tool. Also, different rotary tools may be used in the temporary bonding step and the main bonding step. The temporary bonding step may not necessarily be performed or may be omitted.

  Further, in the main joining step of the first embodiment, the tip end of the stirring pin F2 of the rotary tool F is made to reach from the auxiliary member 30 to the second metal member 20 and the first metal member 10, but is limited thereto It is not a thing. If the plasticized region is formed in the first metal member 10 at a predetermined depth, the tip of the stirring pin F2 may not reach the first metal member 10.

  In the first embodiment, as shown in FIG. 1, the outer corner portion 24 of the first metal member 10 is chamfered round and the overlapping portion J is provided with the gaps S and S, but is limited thereto It is not something to be done. For example, a flat sloped portion may be formed at the outer corner portion, and the gap S may be eliminated.

Second Embodiment
Next, the auxiliary member disposing step, the main joining step, and the removing step of the joining method according to the second embodiment of the present invention will be described in detail with reference to FIGS. In the bonding method according to the second embodiment, as shown in FIG. 9, the shape of the auxiliary member 35 and the position where the auxiliary member 35 is arranged on the second metal member 20 in the auxiliary member arranging step are different from the first embodiment. . In the bonding method according to the second embodiment, points different from the bonding method of the first embodiment will be mainly described. In addition, since 1st metal member 10, 2nd metal member 20 grade | etc., Are the structures same as 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The auxiliary member 35 of the second embodiment has a flat plate shape. In the auxiliary member disposing step of the second embodiment, as shown in FIG. 9, either of the first plate portion 21 and the second plate portion 22 at the inner corner portion 25 of the second metal member 20 is used as the back surface 36 of the auxiliary member 35. The surface is brought into surface contact with the surface of the other (in the present embodiment, the second plate portion 22). At the same time, the end surface 37 of the auxiliary member 35 abuts on the surface of either the first plate portion 21 or the second plate portion 22 in the inner corner portion 25 (the first plate portion 21 in the present embodiment).

  In the main bonding process of the second embodiment, as shown in FIG. 10, in order to rotate the rotary tool F (the main welding rotary tool) to the right, the spiral groove is formed counterclockwise from the proximal end toward the distal end There is. Further, in the main bonding step, the rotary tool F is relatively moved from the front side to the rear side in FIG.

  In the main bonding step of the second embodiment, the stirring pin F2 is inserted from the side of the surface (the surface opposite to the back surface 36) of the auxiliary member 35. The friction stir welding is performed in a state in which only the stirring pin F2 of the rotating tool F rotated clockwise is in contact with the auxiliary member 35, the first metal member 10 and the second metal member 20. Thus, in the overlapping portion J, the auxiliary member 35, the first metal member 10, and the second metal member 20 are friction stir welded to form the plasticized region W1.

  In the second embodiment, since the rotary tool F is rotated to the right, the second plate portion 22 side is the side on which the magnitude of the feed speed is subtracted from the magnitude of the tangential velocity at the outer periphery of the rotary tool F (Re side (Retreating side)). On the other hand, the first plate portion 21 side is a side to which the magnitude of the feed speed is added from the magnitude of the tangential velocity at the outer periphery of the rotary tool F (Ad side (Adancing side)).

  When the rotational speed of the rotary tool F is low, the temperature of the plastic fluid material rises on the first plate portion 21 side (Ad side) as compared to the second plate portion 22 side (Re side) of the plasticizing region W1. Since it becomes easy to do, there is a tendency for a lot of burrs to occur on the first plate portion 21 side (Ad side). On the other hand, when the rotational speed of the rotary tool F is fast, although the temperature of the plastic fluid material rises on the first plate portion 21 side (Ad side), the second plate portion 22 side Burr tends to occur on Re side).

  As described above, which side in the traveling direction of the rotary tool F the burrs V are generated in the main bonding step differs depending on the bonding conditions. The bonding conditions include the rotational speed, rotational direction, moving speed (feed speed) of the rotary tool F, the materials of the first metal member 10, the second metal member 20 and the auxiliary member 35, and the thickness of each member. , Is determined by the combination of these elements. In the main bonding step, bonding conditions are set such that the burrs V are formed on the auxiliary member 35.

  In the main bonding step of the second embodiment, since the rotational speed of the rotary tool F is set fast, the burrs V are formed on the second plate portion 22 side (Re side). The burr V is formed in connection with the end of the auxiliary member 35 (see FIG. 11).

  In the removal step of the second embodiment, as shown in FIG. 12, the auxiliary member 35 is removed from the second plate portion 22 of the second metal member 20 to remove the burr V together with the auxiliary member 35 remaining on one side. It is possible to easily carry out the process of removing the burrs V. In addition, by setting the rotational speed of the rotary tool F fast, it is possible to increase the moving speed (feed speed) of the rotary tool F. This can shorten the bonding cycle.

  According to the bonding method of the second embodiment described above, the same effects as those of the first embodiment can be obtained. In the second embodiment, the auxiliary member 35 is smaller than the first embodiment, so material loss of the auxiliary member 35 can be reduced.

Third Embodiment
Next, a bonding method according to a third embodiment of the present invention will be described in detail with reference to FIGS. 13 to 18. The joining method according to the third embodiment differs from the joining method according to the first embodiment in the shape of the auxiliary member 40 and the point that friction stir welding is performed by inserting a stirring pin from the first metal member side as shown in FIG. . The bonding method according to the third embodiment performs a stacking process, a temporary bonding process, an auxiliary member arranging process, a main bonding process, and a removing process. In addition, since the shape of the 1st metal member 10 and the 2nd metal member 20 is equivalent to 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the overlapping step of the third embodiment, as shown in FIG. 13, the outer corner 24 of the second metal member 20 having an L-shaped cross section and one surface 11 of the flat-plate-shaped first metal member 10 (lower side And the surface of a) to form a polymerized portion J. Specifically, with the outer corner portion 24 of the second metal member 20 facing upward, the second metal member 20 is installed, and the first metal member 10 is installed thereon. At this time, the angle formed by the first metal member 10 and the first plate portion 21 of the second metal member 20 and the angle formed by the first metal member 10 and the second plate portion 22 of the second metal member 20 are both Make it 45 degrees. As described above, in the overlapping step, when the outer corner portion 24 of the second metal member 20 is overlapped on the surface 11 (the lower surface) of the first metal member 10, the overlapping portion J is formed. The first metal member 10 and the second metal member 20 are both temporarily fixed by a fixing jig (not shown).

  In the temporary joining process of the third embodiment, as shown in FIG. 14, the rotating portion F (rotational tool for temporary joining) is used to temporarily hold the overlapping portion J of the first metal member 10 and the second metal member 20. Bond. In the temporary bonding step, only the stirring pin F2 of the rotated rotating tool F is inserted into the other surface 12 (upper surface) of the first metal member 10, and the tip of the stirring pin F2 is brought into contact with the overlapping portion J Perform temporary bonding at the spot. In the temporary bonding step, only the stirring pin F2 is shallowed in the overlapping portion J at a predetermined interval (the depth of the tip of the stirring pin F2 reaches the surface of the outer corner portion 24 of the second metal member 20) . A plasticization region W0 is formed in the pressing mark of the stirring pin F2.

  Although temporary joining is performed by performing friction stir welding using rotary tool F (rotation tool for temporary joining) in the temporary joining process of 3rd embodiment, it is not limited to this. The temporary joining may be performed by welding from the other surface 12 side of the first metal member 10.

  The auxiliary member 40 of the third embodiment has a flat plate shape. In the auxiliary member disposing step of the third embodiment, as shown in FIG. 15, the auxiliary member 40 is so covered as to cover the other surface 12 of the first metal member 10 at a position corresponding to the outer corner 24 of the second metal member 20. Place. The back surface 41 of the auxiliary member 40 is in surface contact with the other surface 12 of the first metal member 10. The auxiliary member 40 is disposed so as to spread on both sides centering on the overlapping portion J. That is, the central portion 43 of the auxiliary member 40 is disposed along the overlapping portion J.

  In the main bonding step of the third embodiment, as shown in FIG. 16, the stirring pin F2 of the rotating tool F rotated is assisted from the other surface 12 side of the first metal member 10 (surface side of the auxiliary member 40) Insert into the member 40. The stirring pin F2 is inserted into the central portion 43 of the auxiliary member 40. The stirring pin F2 is inserted until its tip reaches the polymerization portion J. At this time, friction stir welding is performed by bringing only the stirring pin F2 into contact with the auxiliary member 40, the first metal member 10, and the second metal member 20. The rotary tool F is moved along the polymerization portion J while the proximal end side of the stirring pin F2 is exposed. Thus, in the overlapping portion J, the auxiliary member 40, the first metal member 10, and the second metal member 20 are friction stir welded. In the movement trajectory of the rotary tool F, a plasticization area W1 is formed.

  After the main joining step, the auxiliary member 40 is divided into the left and right by the plasticization region W1. Burrs V, V are formed at the ends of the divided auxiliary members 40, 40.

  In the removal step of the third embodiment, as shown in FIG. 17, the auxiliary member 40 integrated with the burr V is removed from the first metal member 10. In the removing step, the auxiliary member 40 is removed from the first metal member 10 by bending the auxiliary member 40 away from the other surface 12 of the first metal member 10 manually, for example.

  According to the bonding method of the third embodiment described above, the same effects as those of the first embodiment can be obtained. In addition, in the third embodiment, as shown in FIG. 18, the other surface 12 of the first metal member 10 and the surface of the plasticized area W1 can be prevented from being able to prevent metal shortage of the joint (plasticized area W1). Can be made substantially flush.

Fourth Embodiment
Next, the auxiliary member disposing step, the main joining step, and the removing step of the joining method according to the fourth embodiment of the present invention will be described in detail with reference to FIGS. The bonding method according to the fourth embodiment differs from the third embodiment in the position where the auxiliary member 45 is arranged on the first metal member 10 in the auxiliary member arranging step, as shown in FIG. In the bonding method according to the fourth embodiment, points different from the bonding method of the third embodiment will be mainly described. In addition, since the 1st metal member 10, the 2nd metal member 20 grade | etc., Are the structures same as 3rd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 19, the auxiliary member 45 of the fourth embodiment has a flat plate shape, and has a width that is approximately half that of the auxiliary member 45 of the third embodiment. Here, a line passing through the end face 47 of the auxiliary member 45 and orthogonal to the other surface 12 of the first metal member 10 is taken as a reference line L.

  In the auxiliary member arranging step of the fourth embodiment, the first plate portion 21 side and the second plate sandwiching the position corresponding to the outer corner portion 24 of the second metal member 20 on the other surface 12 of the first metal member 10 The auxiliary member 45 is placed on any one of the parts 22 (in the present embodiment, the second plate part 22 side). The auxiliary member 45 is disposed such that the reference line L passing through the end of the auxiliary member 45 passes through the central portion of the outer corner 24 of the second metal member 20.

In the main bonding step of the fourth embodiment, as shown in FIG. 20, the stirring pin F2 of the rotated rotary tool F is assisted from the other surface 12 side of the first metal member 10 (surface side of the auxiliary member 45) It is inserted into the member 45. The stirring pin F2 is inserted at a position where the rotation center axis of the rotating tool F overlaps the reference line L, and the stirring pin F2 is moved along the overlapping portion J while keeping the rotation center axis and the reference line L overlapping. Let Thus, in the overlapping portion J, the auxiliary member 45, the first metal member 10, and the second metal member 20 are friction stir welded to form the plasticized region W1.
As shown in FIG.

  In the main bonding process of the fourth embodiment, in order to rotate the rotary tool F (the main welding rotary tool) to the right, the spiral groove is formed counterclockwise from the proximal end toward the distal end. Further, in the main joining step, the rotary tool F is relatively moved from the front side to the rear side in FIG. Friction stir welding is performed in a state in which only the stirring pin F2 of the rotating tool F rotated right is in contact with the auxiliary member 45, the first metal member 10, and the second metal member 20.

  In the fourth embodiment, since the rotary tool F is rotated to the right, on the second plate portion 22 side (right side in FIG. 20), the magnitude of the feed speed is determined from the magnitude of the tangential velocity at the outer periphery of the rotary tool F It is the side to be subtracted (Re side). On the other hand, the first plate portion 21 side (left side in FIG. 20) is a side (Ad side) to which the size of the feed speed is added from the size of the tangential speed at the outer periphery of the rotary tool F.

  When the rotational speed of the rotary tool F is low, the temperature of the plastic fluid material rises on the first plate portion 21 side (Ad side) as compared to the second plate portion 22 side (Re side) of the plasticizing region W1. Since it becomes easy to do, there is a tendency for a lot of burrs to occur on the first plate portion 21 side (Ad side). On the other hand, when the rotational speed of the rotary tool F is fast, although the temperature of the plastic fluid material rises on the first plate portion 21 side (Ad side), the second plate portion 22 side Burr tends to occur on Re side). As described above, which side in the traveling direction of the rotary tool F the burrs V are generated in the main bonding step differs depending on the bonding conditions. The bonding conditions include the rotational speed, rotational direction, moving speed (feed speed), moving direction, materials of the first metal member 10, the second metal member 20 and the auxiliary member 45, the thickness of each member, etc. It is decided by each element and the combination of these elements. In the main bonding step, bonding conditions are set such that the burrs V are formed on the auxiliary member 45.

  In the main bonding step of the fourth embodiment, since the rotational speed of the rotary tool F is set fast, the burrs V are formed on the second plate portion 22 side (Re side) of the auxiliary member 45. The burr V is formed in connection with the end of the auxiliary member 45 (see FIG. 11).

  In the removal step of the fourth embodiment, as shown in FIG. 21, the burrs V can be removed together with the remaining auxiliary member 45 by removing the auxiliary member 45 from the other surface 12 of the first metal member 10. Therefore, the process of removing the burrs V can be easily performed. In addition, by setting the rotational speed of the rotary tool F fast, it is possible to increase the moving speed (feed speed) of the rotary tool F. This can shorten the bonding cycle.

  According to the bonding method of the fourth embodiment described above, the same effects as those of the third embodiment can be obtained. In the fourth embodiment, the auxiliary member 45 is smaller than the third embodiment, so material loss of the auxiliary member 45 can be reduced.

Fifth Embodiment
Next, the auxiliary member arranging step and the main bonding step of the bonding method according to the fifth embodiment of the present invention will be described with reference to FIGS. The bonding method according to the fifth embodiment differs from the fourth embodiment in the position where the auxiliary member 45 is arranged on the first metal member 10 in the auxiliary member arranging step, as shown in FIG.

  In the auxiliary member arranging step of the fifth embodiment, the first plate portion 21 side and the second plate sandwiching the position corresponding to the outer corner portion 24 of the second metal member 20 on the other surface 12 of the first metal member 10 The auxiliary member 45 is placed on any one of the parts 22 (in the present embodiment, the second plate part 22 side). At the same time, the other end of the first plate portion side and the second plate portion side (the first plate portion 21 side in the present embodiment) sandwiching the position where the end portion of the auxiliary member 45 corresponds to the outer corner portion 24 The auxiliary member 45 is arranged to project to the Specifically, about 90% of the auxiliary member 45 is disposed closer to the second plate 22 than the position corresponding to the outer corner 24, and the remaining 10% of the auxiliary member 45 corresponds to the outer corner 24. It arrange | positions to the 1st board part 21 side rather than the position to be. That is, the end portion of the auxiliary member 45 disposed on the second plate portion 22 side is disposed so as to slightly project toward the first plate portion 21 side.

In the main joining step of the fifth embodiment, the auxiliary member 45 remains on only one side of the rotary tool after the main joining step (see FIG. 23), and the rotation center axis of the rotary tool is the auxiliary member than the reference line L Shift to the center side of 45 and move the stirring pin. That is, the end portion of the auxiliary member 45 sandwiches the position corresponding to the outer corner portion 24 to such an extent that the auxiliary member 45 remains on only one side of the rotary tool after performing the main bonding step. The auxiliary member 45 is disposed to project to the other side on the plate portion side. In this embodiment, the stirring pin is shifted so that the rotation center axis of the rotation tool is located at the center of the outer corner 24 of the second metal member 20. That is, the end portion of the auxiliary member 45 disposed on the second plate portion 22 side is disposed so as to slightly project toward the first plate portion 21 side.

  In the main joining step, which side in the direction of travel of the rotary tool F the burrs V are generated depends on the joining conditions. In the main bonding step, bonding conditions are set so that the auxiliary members 45 on which the burrs V remain are formed.

  According to the bonding method of the fifth embodiment described above, the same effects as those of the third embodiment can be obtained. In the fifth embodiment, material loss of the auxiliary member 45 can be reduced, and more auxiliary members 45 are positioned around the stirring pin than in the fourth embodiment, so that more metal is supplied to the joint portion. Can.

10 first metal member 11 one surface 12 other surface 20 second metal member 21 first plate portion 22 second plate portion 24 outer corner portion 25 inner corner portion 30 auxiliary member 31 back surface 35 auxiliary member 36 back surface 37 end surface 40 auxiliary Member 41 back surface 43 central portion 45 auxiliary member 47 end surface F rotation tool F2 stirring pin H welding torch J overlapping portion L reference line V burr W0 plasticization area W1 plasticization area

Claims (14)

It is a joining method of joining a first metal member and a second metal member by friction stirring using a rotary tool for main joining provided with a stirring pin,
The first metal member is formed of a flat plate material,
The second metal member includes a first plate portion and a second plate portion bent from the first plate portion, and is configured as a bent plate having an L-shaped cross section.
A superposition step of laminating one surface of the first metal member and an outer corner portion of the second metal member to form a superposed portion;
An auxiliary member arranging step of arranging the auxiliary member on the second metal member by bringing the back surface of the auxiliary member having an L-shaped cross section into surface contact with the inner corner of the second metal member so as to cover the inner corner. When,
The stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin is in contact with the auxiliary member, the first metal member and the second metal member, or the auxiliary member and the second metal member A main welding step of moving the auxiliary welding tool, the first metal member and the second metal member by friction stir welding by moving the main welding rotary tool along the overlapping portion;
Removing the auxiliary member on which the burrs are formed from the second metal member. It is a joining method of joining a first metal member and a second metal member by friction stirring using a rotary tool for main joining provided with a stirring pin,
The first metal member is formed of a flat plate material,
The second metal member includes a first plate portion and a second plate portion bent from the first plate portion, and is configured as a bent plate having an L-shaped cross section.
A superposition step of laminating one surface of the first metal member and an outer corner portion of the second metal member to form a superposed portion;
The back surface of the flat auxiliary member is brought into surface contact with any one of the first plate portion and the second plate portion at the inner corner portion of the second metal member, and the first plate portion and the second plate portion An auxiliary member disposing step of arranging the auxiliary member on the second metal member by bringing the end face of the auxiliary member into contact with any other surface of the plate portion;
The stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin is in contact with the auxiliary member, the first metal member and the second metal member, or the auxiliary member and the second metal member A main welding step of moving the auxiliary welding tool, the first metal member and the second metal member by friction stir welding by moving the main welding rotary tool along the overlapping portion;
Removing the auxiliary member on which the burrs are formed from the second metal member.   Before the auxiliary member disposing step, only the stirring pin of the rotating tool for temporary bonding is inserted into the inner corner portion of the second metal member, and friction stir welding of the first metal member and the second metal member is performed by spots. The bonding method according to claim 1 or 2, further comprising a temporary bonding step of performing.   The bonding method according to claim 3, wherein the main welding rotary tool and the temporary welding rotary tool are the same rotary tool.   Prior to the auxiliary member disposing step, the method further includes a temporary joining step of welding the first metal member and the second metal member by welding at a spot from the inner corner portion side of the second metal member. The bonding method according to claim 1 or 2, characterized in that:   The welding method according to claim 5, wherein the welding is MIG welding, TIG welding or laser welding. It is a joining method of joining a first metal member and a second metal member by friction stirring using a rotary tool for main joining provided with a stirring pin,
The first metal member is formed of a flat plate material,
The second metal member includes a first plate portion and a second plate portion bent from the first plate portion, and is configured as a bent plate having an L-shaped cross section.
A superposition step of laminating one surface of the first metal member and an outer corner portion of the second metal member to form a superposed portion;
The back surface of the flat auxiliary member is brought into surface contact so as to cover the other surface of the first metal member at a position corresponding to the outer corner portion of the second metal member, and the auxiliary member is moved to the first metal member. Auxiliary member arrangement process to arrange,
The state in which the stirring pin is inserted from the surface side of the auxiliary member and only the stirring pin is in contact with the auxiliary member, the first metal member and the second metal member, or the auxiliary member and the first metal member A main welding step of moving the auxiliary welding tool, the first metal member and the second metal member by friction stir welding by moving the main welding rotary tool along the overlapping portion;
Removing the auxiliary member on which the burrs are formed from the first metal member. In the auxiliary member disposing step, the auxiliary member is disposed so that the auxiliary member spreads on both sides centering on the overlapping portion,
8. The bonding method according to claim 7, wherein the stirring pin is inserted into a central portion of the auxiliary member in the main bonding step. When a line passing through the end face of the auxiliary member and orthogonal to the first metal member is a reference line,
Arranging the auxiliary member such that the reference line passes through an outer corner of the second metal member in the auxiliary member arranging step;
In the main bonding step, the stirring pin is moved so that the central axis of rotation of the main bonding rotating tool and the reference line overlap, and the bonding conditions are set so that a burr is formed on the auxiliary member. The bonding method according to claim 7, characterized in that When a line passing through the end face of the auxiliary member and orthogonal to the first metal member is a reference line,
In the auxiliary member disposing step, the first plate portion side and the second plate portion side sandwiching a position corresponding to the outer corner portion of the second metal member on the other surface of the first metal member While the auxiliary member is placed, the end portion of the auxiliary member may protrude to the other side of the first plate portion side and the second plate portion side across the position corresponding to the outer corner portion. Arrange the auxiliary members,
In the main bonding step, the rotation center axis of the main bonding rotating tool is larger than the reference line such that the auxiliary member remains on only one side of the main bonding rotating tool after performing the main bonding step. 8. The bonding method according to claim 7, wherein the welding condition is set so that the stirring pin is moved to shift to the center side of the member and burrs are formed on the remaining auxiliary member.   Prior to the auxiliary member disposing step, only the stirring pin of the temporary bonding rotary tool is inserted into the other surface of the first metal member at a position corresponding to the outer corner portion of the second metal member, The joining method according to any one of claims 7 to 10, further comprising a temporary joining step of performing friction stir welding of one metal member and the second metal member.   The bonding method according to claim 11, wherein the main welding rotary tool and the temporary welding rotary tool are the same rotary tool.   Before the auxiliary member disposing step, welding is performed with a spot on the other surface of the first metal member at a position corresponding to the outer corner portion of the second metal member, and the first metal member and the second metal member The joining method according to any one of claims 7 to 10, further comprising a temporary joining step of joining together.   The joining method according to claim 13, wherein the welding is MIG welding, TIG welding or laser welding.

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