WO2021029088A1

WO2021029088A1 - Joining method

Info

Publication number: WO2021029088A1
Application number: PCT/JP2019/045372
Authority: WO
Inventors: 堀　久司; 伸城瀬尾
Original assignee: 日本軽金属株式会社
Priority date: 2019-08-09
Filing date: 2019-11-20
Publication date: 2021-02-18
Also published as: CN114173980A

Abstract

The present invention is characterized by comprising: a placing step of placing a lid member (3) on a main body (2) to form a first abutting part (J1) by abutting a step side surface of a peripheral wall step part against a side surface of the lid member (3), and to form a second abutting part by stacking a step bottom surface of the peripheral wall step part on a rear surface of the lid member (3); a main joining step of inserting only a rotating stirring pin (F2) into the first abutting part (J1), moving a rotation tool F along the first abutting part (J1) while only the stirring pin (F2) is in contact with the peripheral wall step part and the lid member 3 to perform friction stirring, and thereafter moving the rotation tool F so as to climb along an inclined surface (4c) of a ramp (4) and pull out the stirring pin (F2) at the upper side of the inclined surface (4c); and a ramp removal step of cutting and removing the ramp (4).

Description

Joining method

The present invention relates to a joining method.

Friction stir welding is known as a technique for joining metal members to each other. Friction stir welding has a problem that a drawing hole remains when the stirring pin provided in the rotary tool is pulled out from the metal member. Therefore, a joining method is known in which no drawing hole remains in the metal member.

For example, in the joining method according to Patent Document 1, a method of reducing the drawing marks by gradually pulling out while moving the stirring pin is disclosed.

Japanese Unexamined Patent Publication No. 2016-87649

However, the joining method of Patent Document 1 has a problem that a drawing mark remains in the plasticized region when the rotating tool is gradually pulled out.

Therefore, it is an object of the present invention to provide a joining method capable of preventing the generation of pull-out holes and pull-out marks by the stirring pin when joining the main body provided with the recess and the lid member by friction stir welding.

The present invention is a joining method in which a main body provided with a recess and a lid member for sealing the opening of the recess are joined by friction stirring, and the outer peripheral surface of a stirring pin of a rotating tool used in friction stirring is tapered. The main body has a bottom portion and a peripheral wall portion rising from the peripheral edge portion of the bottom portion, and the inner peripheral wall portion of the peripheral wall portion has a step bottom surface that is one step lower than the end surface of the peripheral wall portion and the step bottom surface. A preparatory step of forming a peripheral wall stepped portion having a stepped side surface rising from the above, forming an inclined table that is close to the stepped side surface and protrudes from the end surface of the peripheral wall portion, and placing the lid member on the main body. As a result, the stepped side surface of the peripheral wall stepped portion and the side surface of the lid member are butted to form the first butted portion, and the stepped bottom surface of the peripheral wall stepped portion and the back surface of the lid member are overlapped with each other to form the second butted portion. Along the first butt portion in a state where only the rotating stirring pin is inserted into the first butt portion and only the stirring pin is in contact with the peripheral wall step portion and the lid member. After the rotary tool is moved to perform frictional agitation, the rotating tool is moved so as to rise along the inclined surface of the inclined surface, and the stirring pin is pulled out on the upper side of the inclined surface. It is characterized by including a tilting table removing step of removing the above.

Further, the present invention is a joining method in which a main body provided with a recess and a lid member for sealing the opening of the recess are joined by friction stirring, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stirring is tapered. The main body has a bottom portion and a peripheral wall portion rising from the peripheral edge portion of the bottom portion, and the inner peripheral wall portion of the peripheral wall portion has a step bottom surface that is one step lower than the end surface of the peripheral wall portion. A preparatory step of forming a peripheral wall step portion having a step side surface rising from the step bottom surface to form an inclined table that is close to the side surface of the lid member and protrudes from the surface of the lid member, and the lid member on the main body. By placing the above, the step side surface of the peripheral wall step portion and the side surface of the lid member are butted to form the first abutting portion, and the step bottom surface of the peripheral wall step portion and the back surface of the lid member are overlapped. In the mounting step of forming the second butt portion, only the rotating stirring pin is inserted into the first butt portion, and only the stirring pin is in contact with the peripheral wall step portion and the lid member. This joining step of moving the rotating tool along one butt portion to perform frictional agitation, and then moving the rotating tool so as to rise along the inclined surface of the inclined table and pulling out the stirring pin on the upper side of the inclined surface. It is characterized by including a tilting table removing step of removing the tilting table.

According to this joining method, after performing friction stir welding, the stirring pin can be pulled out on an inclined table provided at a position different from the butt portion. Further, the inclined table can be removed from the peripheral wall portion or the lid member. As a result, it is possible to prevent the occurrence of pull-out holes and pull-out marks by the stirring pin on the peripheral wall portion or the lid member.

Further, the present invention is a joining method in which a support column and a lid member having a hole into which the tip of the support column is inserted are joined by friction stirring, and the outer peripheral surface of a stirring pin of a rotary tool used in friction stirring is tapered. A preparation step of forming a support step portion having a step bottom surface and a step side surface rising from the step bottom surface at the tip of the support column and forming an inclined table at the tip end of the support column. By placing the lid member on the strut, the step side surface of the strut step portion and the hole wall of the hole portion are abutted to form the first abutment portion, and the step bottom surface of the strut step portion and the lid are formed. A mounting step of superimposing the back surface of the member to form a second butt portion, and inserting only the rotating stirring pin into the first butt portion, and inserting only the stirring pin into the column step portion and the lid member. After the rotary tool is moved along the first butt portion in the contacted state to perform frictional stirring, it is moved so as to rise along the inclined surface of the inclined table and the stirring is performed on the upper side of the inclined surface. It is characterized by including a main joining step of pulling out a pin and a tilting table removing step of removing the tilting table.

Further, the present invention is a joining method in which a support column and a lid member having a hole into which the tip of the support column is inserted are joined by friction stirring, and the outer peripheral surface of a stirring pin of a rotary tool used in friction stirring is tapered. A preparatory step of forming a support step portion having a step bottom surface and a step side surface rising from the step bottom surface at the tip of the support column, and forming an inclination table on the surface of the lid member. By placing the lid member on the strut, the step side surface of the strut step portion and the hole wall of the hole portion are abutted to form the first abutment portion, and the step bottom surface of the strut step portion and the step bottom surface are described. A mounting step of superimposing the back surface of the lid member to form a second butt portion, and inserting only the rotating stirring pin into the first butt portion, and inserting only the stirring pin into the column step portion and the lid member. The rotating tool is moved along the first abutting portion to perform frictional agitation, and then is moved so as to rise along the inclined surface of the inclined table so as to rise along the inclined surface of the inclined table. It is characterized by including a main joining step of pulling out a stirring pin and a tilting table removing step of removing the tilting table.

According to this joining method, after performing friction stir welding, the stirring pin can be pulled out on an inclined table provided at a position different from the butt portion. Further, the inclined table can be removed from the support column or the lid member. As a result, it is possible to prevent the generation of a pull-out hole and a pull-out mark by the stirring pin on the support column or the lid member.

According to the present invention, when the main body provided with the recess and the sealing body are joined by friction stir welding, it is possible to prevent the occurrence of pull-out holes and pull-out marks by the stirring pin.

It is an exploded perspective view which shows the preparation process of the joining method which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the mounting process of the joining method which concerns on 1st Embodiment of this invention. It is a top view which shows the main joining process of the joining method which concerns on 1st Embodiment of this invention. It is a perspective view of the end position of this joining process of the joining method which concerns on 1st Embodiment of this invention. Joining method according to the first embodiment of the present invention It is sectional drawing of the end position of this joining process. It is a perspective view which shows the joining method which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the joining method which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the preparation process of the joining method which concerns on 4th Embodiment of this invention. It is a top view which shows the preparation process of the joining method which concerns on 4th Embodiment. It is sectional drawing which shows the mounting process of the joining method which concerns on 4th Embodiment. It is a perspective view which shows the main joining process of the joining method which concerns on 4th Embodiment. It is sectional drawing which shows the main joining process of the joining method which concerns on 4th Embodiment. It is a top view which shows the main joining process of the joining method which concerns on 4th Embodiment. It is a perspective view which shows the preparation process of the joining method which concerns on 5th Embodiment of this invention. It is a perspective view which shows the main joining process of the joining method which concerns on 5th Embodiment. It is a top view which shows the main joining process of the joining method which concerns on 5th Embodiment. It is a perspective view which shows the main joining process of the joining method which concerns on 6th Embodiment. It is a perspective view which concerns on the 1st modification of this invention. It is a perspective view which concerns on the 2nd modification of this invention.

[First Embodiment]
Hereinafter, embodiments for carrying out the present invention will be described with reference to figures and the like. In the following description, the surface opposite to the "back surface" is referred to as the "front surface".

As shown in FIG. 1, in the joining method according to the present embodiment, the metal main body 2 and the metal lid member 3 are joined by friction stir welding to form a hollow container 1.

The main body 2 is a box-shaped body with an opening at the top. The main body 2 is composed of a bottom portion 10, a peripheral wall portion 11, and an inclined table 4. Although an aluminum alloy is used for the main body 2 in the present embodiment, it can be appropriately selected from metals capable of friction stir welding. For example, the main body 2 can be formed of an aluminum alloy, a magnesium alloy, a copper alloy, aluminum, magnesium, titanium, or the like.

The bottom portion 10 has a rectangular plate shape in a plan view. The peripheral wall portion 11 is erected on the peripheral edge of the bottom portion 10 and has a rectangular frame shape in a plan view. The peripheral wall portion 11 is composed of

wall portions

11A, 11B, 11C, and 11D having the same plate thickness. The

wall portions

11A and 11C are short side portions and face each other. The

wall portions

11B and 11D have long sides and face each other. A recess 13 is formed inside the bottom portion 10 and the peripheral wall portion 11.

A peripheral wall step portion 12 is formed along the inner peripheral edge of the peripheral wall portion 11 of the main body 2 on the end surface 11a which is the end surface of the peripheral wall portion 11. The peripheral wall step portion 12 is composed of a step bottom surface 12a and a step side surface 12b rising from the step bottom surface 12a. The step bottom surface 12a is formed at a position one step lower than the end surface 11a.

The tilting table 4 is provided on the end face 11a. The inclined table 4 is composed of an inclined table side surface 4a, an inclined table side surface 4b, an inclined surface 4c, and an approach portion 4d. The inclined table side surface 4a and the inclined table side surface 4b are side surfaces of the inclined table 4, and face each other. The inclined table side surface 4a is formed at a position separated from the step side surface 12b. The distance from the inclined table side surface 4a to the step side surface 12b is preferably set so that the rotating tool F and the inclined table 4 do not interfere with each other when the main joining step described later is performed.

The inclined surface 4c may be a slope that gradually rises, and may be a flat surface or a curved surface. The lower end of the approach portion 4d is in contact with the step side surface 12b and the upper end is in contact with the inclined surface 4c, and the approach portion 4d is gently curved and inclined while changing the 90 ° direction. In the present embodiment, the inclined table 4 is provided on the end surface 11a of the wall portion 11D, but may be the end surface 11a of the

wall portions

11A, 11B, 11C. Further, the lower end of the approach portion 4d may be separated from the step side surface 12b so as not to come into contact with the rotating tool F during the main joining step.

The main body 2 is preferably formed by die casting, for example. According to die casting, the main body 2 provided with the inclined table 4 can be easily integrally formed.

The lid member 3 is a rectangular plate member in a plan view that seals the opening of the main body 2. The material of the lid member 3 may be the same metal as the main body 2 or may be a different metal. The lid member 3 is formed in a size that allows it to be placed on the peripheral wall step portion 12 with almost no gap. The plate thickness dimension of the lid member 3 may be larger than the height dimension of the step side surface 12b.

Next, the joining method according to this embodiment will be described. The joining method according to the present embodiment includes a preparation step, a mounting step, a main joining step, and a tilting table removing step.

As shown in FIG. 1, the preparatory step is a step of forming a main body 2 having a tilting table 4 and a recess 13 and a lid member 3 to be placed on the main body 2. The main body 2 is formed by die casting, for example.

As shown in FIG. 2, the mounting step is a step of mounting the lid member 3 on the peripheral wall step portion 12 formed on the main body 2. The step side surface 12b of the peripheral wall step portion 12 and the side surface 3c of the lid member 3 are butted to form the first butted portion J1. Further, the step bottom surface 12a of the peripheral wall step portion 12 and the bottom surface 3b of the lid member 3 are butted to form the second butted portion J2. The end surface 11a of the peripheral wall portion 11 and the surface 3a of the lid member 3 are flush with each other.

This joining step is a step of friction stir welding of the first butt portion J1 using the rotary tool F. As shown in FIG. 2, the rotation tool F has a connecting portion F1 and a stirring pin F2. 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 engraved on the outer peripheral surface of the stirring pin F2. In the present embodiment, in order to rotate the rotation tool F clockwise, a spiral groove is carved counterclockwise from the base end to the tip end.

When rotating the rotation tool F counterclockwise, engrave the spiral groove clockwise from the base end to the tip end. In this way, the metal plastically fluidized by friction stir welding is guided by the spiral groove and moves to the tip side of the stirring pin F2. As a result, the amount of metal overflowing from the metal member to be joined (main body 2 and lid member 3) can be reduced.

In the main joining step, as shown in FIG. 3, the main step from the start position Sp to the intermediate point S1 and the detaching step from the intermediate point S1 to the end position Ep are performed. In this step, the rotary tool F is used to perform friction stir welding along the first butt portion J1. The rotation tool F is inserted into an arbitrarily set start position Sp, and the rotation tool F is moved clockwise along the first butt portion J1.

The insertion depth of the stirring pin F2 is set so that the tip of the stirring pin F2 reaches the step bottom surface 12a of the peripheral wall step portion 12 and only the stirring pin F2 contacts the lid member 3 and the peripheral wall portion 11. To do. Then, the rotation tool F is moved by tracing the first butt portion J1 while maintaining a constant height position.

A plasticized region W is formed in the movement locus of the rotation tool F. When the rotation tool F started from the start position Sp makes a round and reaches the start position Sp, the plasticization regions W are overlapped and moved to the intermediate point S1. When the rotation tool F reaches the intermediate point S1, the rotation tool F is not disengaged and the process proceeds to the disengagement step as it is.

As shown in FIG. 4, the detaching step is a step of moving the rotation tool F from the intermediate point S1 to the end position Ep and detaching it on the inclined table 4. In the detaching step, the rotation tool F enters the approach portion 4d while keeping the insertion depth constant, and is moved to the inclined surface 4c of the inclined table 4. Then, the rotation tool F is moved along the inclined surface 4c while being gradually separated from the end surface 11a. When the rotation tool F reaches the end position Ep, the rotation tool F is raised to separate the rotation tool F from the inclined table 4.

Finally, the tilting table removing step of removing the tilting table 4 from the main body 2 is performed. In the inclined table removing step, for example, all the inclined table 4 is removed with reference to the end face 11a by cutting or grinding.

According to the joining method described above, the end position Ep of the rotation tool F is set to the inclined table 4, and the inclined table 4 is cut off. As a result, it is possible to prevent the pull-out hole and the pull-out mark from remaining in the main body 2. Further, as a result, no pull-out hole or pull-out mark remains on the surface of the main body 2, so that a clean finish can be achieved.

Further, since the rotation tool F is raised along the inclined surface 4c, when the rotation tool F is moved to the end position Ep, the stirring pin F2 and the end surface 11a can be separated from each other. As a result, the pull-out hole generated when the rotary tool F is detached does not remain in the main body 2, but can be left only in the inclined table 4.

Further, by providing the approach portion 4d on the inclined table 4, the rotating tool F can be smoothly moved from the first butt portion J1 to the inclined table 4 without slowing down the moving speed. Further, since the lower end of the approach portion 4d is in contact with the step side surface 12b, it is possible to prevent the plasticized region W from remaining on the end surface 11a as much as possible during the detaching step.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. In the present embodiment, the direction in which the inclined table is formed is different from that in the first embodiment. In this embodiment, a part different from the first embodiment will be described.

In the present embodiment, as shown in FIG. 6, the inclined table 4B is formed so that the inclined direction of the inclined surface 4c is perpendicular to the first butt portion J1. The lower end of the inclined surface 4c is in contact with the step side surface 12b. The lower end of the inclined surface 4c and the step side surface 12b may be separated from each other so as not to come into contact with the rotating tool F during the main joining step.

In the detaching step, in the first embodiment, when the rotation tool F is moved to the inclined surface 4c, it is moved via the approach portion 4d. However, in the present embodiment, since the inclined surface 4c is connected perpendicularly to the step side surface 12b, the rotating tool F can be easily inclined only by moving the rotating tool F 90 ° to the left at the intermediate point S1. It can be moved to the table 4B. The other configurations are the same as those in the first embodiment.

Even with the joining method described above, it is possible to obtain substantially the same effect as that of the first embodiment.

[Third Embodiment]
Next, the joining method according to the third embodiment of the present invention will be described. The present embodiment differs from the first embodiment in that the tilting table is formed on the lid member 3. In this embodiment, a part different from the first embodiment will be described.

As shown in FIG. 7, in the present embodiment, the inclined table 4C is formed so as to project on the surface 3a of the lid member 3. The approach portion 4d of the tilting table 4C has a lower end in contact with the side surface 3c of the lid member 3 and an upper end in contact with the inclined surface 4c, and is gently curved and inclined while changing the 90 ° direction. The lower end of the inclined surface 4c and the side surface 3c of the lid member 3 may be separated from each other so as not to come into contact with the rotating tool F during the main joining step.

The tilting table 4C of the lid member 3 can be formed by die casting, for example, as in the first embodiment. Thereby, the tilting table 4C and the lid member 3 can be easily integrally formed.

The main joining process is the same as that of the first embodiment except that the joining process is separated by the inclined table 4C. Further, since the other configurations are the same as those in the first embodiment, detailed description thereof will be omitted. As described above, even the joining method according to the third embodiment can exhibit substantially the same effect as that of the first embodiment.

[Fourth Embodiment]
The joining method according to the embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 8, the joining method of the present embodiment is to join the support column 215 and the lid member 203, but here, the main body 202 provided with the support column 215 and the lid member 203 are joined to be hollow. The case of manufacturing a container is illustrated. The present invention is a joining method for joining a support column and a lid member, and the shape of the support column, the shape of the lid member, the application, and the like are not particularly limited.

The joining method of the present embodiment is to manufacture a hollow container 201 by friction stir welding the main body 202 and the lid member 203. In the following description, the "front surface" means the surface opposite to the "back surface".

The joining method according to the present embodiment includes a preparation step, a mounting step, a main joining step, and a tilting table removing step. The preparation step is a step of preparing the main body 202 and the lid member 203. The main body 202 is mainly composed of a bottom portion 210, a peripheral wall portion 211, and a plurality of columns 215. The main body 2 is made of a metal that can be bonded by friction and stirring, and is made of, for example, aluminum, an aluminum alloy, copper, a copper alloy, magnesium, a magnesium alloy, titanium, a titanium alloy, or the like. The main body 2 is made of an aluminum alloy in this embodiment. The main body 202 may be formed of, for example, an aluminum alloy casting material such as JISH5302 ADC12 (Al—Si—Cu system).

As shown in FIG. 8, the bottom 210 is a plate-shaped member having a rectangular shape in a plan view. The peripheral wall portion 211 is a wall portion that rises in a rectangular frame shape from the peripheral edge portion of the bottom portion 210. A peripheral wall step portion 212 is formed on the inner peripheral edge of the peripheral wall portion 211. The peripheral wall step portion 212 is composed of a step bottom surface 212a and a step side surface 212b rising from the step bottom surface 212a. As shown in FIG. 10, the step side surface 212b is inclined so as to spread outward from the step bottom surface 212a toward the opening. The inclination angle β of the step side surface 212b may be appropriately set, and is, for example, 3 ° to 30 ° with respect to the vertical plane. A recess 213 is formed in the bottom portion 210 and the peripheral wall portion 211.

As shown in FIG. 8, the support column 215 rises vertically from the bottom 210. The number of columns 215 is not particularly limited, but in the present embodiment, four columns are formed. Further, although the shape of the support column 215 is columnar in the present embodiment, it may be another shape such as a prism. A protrusion 216 is formed at the tip of the support column 215. The shape of the protruding portion 216 is not particularly limited, but in the present embodiment, it has a truncated cone shape. The height of the protruding portion 216 is smaller than the plate thickness of the lid member 203.

By forming the projecting portion 216, a strut step portion 217 is formed at the tip of the strut 215. The strut step portion 217 is composed of a step bottom surface 217a and a step side surface 217b rising from the step bottom surface 217a. The step bottom surface 217a is formed at the same height position as the step bottom surface 212a of the peripheral wall step portion 212. The height dimension of the step side surface 217b is smaller than the plate thickness of the lid member 203. The step side surface 217b is inclined so as to be separated from the hole wall 204a so as to taper toward the tip.

The lid member 203 is a plate-shaped member that seals the opening of the main body 202. The lid member 203 has a size to be placed on the peripheral wall step portion 212. The plate thickness of the lid member 203 is larger than the height of the step side surface 212b. A hole 204 is formed in the lid member 203 at a position corresponding to the support column 215. The hole 204 is formed so that the protrusion 216 is fitted. The lid member 203 may be made of the same material as the main body 202, or may be made of a different material. In this embodiment, the lid member 203 is made of an aluminum alloy. The lid member 203 may be formed of, for example, an aluminum alloy wrought material such as JIS A1050, A1100, A6063.

As shown in FIG. 9, an inclined table 250 is formed on the tip surface 216a of the protruding portion 216 of each support column 215. The inclined table 250 is composed of an inclined table side surface 250a, an inclined table side surface 250b, and an inclined surface 250c. The inclined

table side surfaces

250a and 250b rise vertically from the tip surface 216a. The inclined table side surface 250a is formed at a position separated inward from the outer peripheral edge of the tip surface 216a so as not to interfere with the stirring pin F2 of the rotating tool F during the main joining step. The inclined surface 250c has an arcuate shape in a plan view, and is a surface that gradually inclines upward as it advances in the circumferential direction.

As shown in FIG. 10, the mounting step is a step of mounting the lid member 203 on the main body 202. In the mounting step, the back surface 203b of the lid member 203 is mounted on the step bottom surface 212a. The step side surface 212b and the outer peripheral side surface 203c of the lid member 203 are butted to form the butt portion J211. Further, the step bottom surface 212a and the back surface 203b of the lid member 203 are abutted to form the butt portion J212.
Further, in the mounting step, the hole wall 204a of the hole 204 and the step side surface 217b of the column step 217 are abutted to form the first butt J21. The first abutment portion J21 may include a case where the hole wall 204a and the step side surface 217b of the strut step portion 217 are butted with a gap having a substantially V-shaped cross section. Further, the back surface 203b of the lid member 203 and the step bottom surface 217a of the column step portion 217 are abutted to form the second butt portion J22.

As shown in FIGS. 11 and 12, this joining step is a step of friction stir welding the butt portion J211 and the first butt portion J21 using the rotation tool F. The rotation tool F is composed of a connecting portion F1 and a stirring pin F2. The rotary tool F is made of, for example, tool steel. The connecting portion F1 is a portion connected to the rotating shaft of the friction stir device (not shown). The connecting portion F1 has a columnar shape, and a screw hole (not shown) for fastening a bolt is formed.

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. As shown in FIG. 12, a flat flat surface F3 that is perpendicular to the rotation center axis C and is flat is formed at the tip of the stirring pin F2. That is, the outer surface of the stirring pin F2 is composed of a tapered outer peripheral surface F10 and a flat surface F3 formed at the tip. When viewed from the side, the inclination angle α formed by the rotation center axis C and the outer peripheral surface F10 of the stirring pin F2 may be appropriately set in the range of, for example, 5 ° to 30 °, but in the present embodiment, the peripheral wall step portion It is set to be the same as the inclination angle β of the step side surface 212b of 212 with respect to the vertical surface and the inclination angle γ of the step side surface 217b of the strut step portion 217 with respect to the vertical surface (see FIG. 10).

A spiral groove is engraved on the outer peripheral surface F10 of the stirring pin F2. In the present embodiment, in order to rotate the rotation tool F clockwise, the spiral groove is formed counterclockwise from the base end to the tip end. In other words, the spiral groove is formed counterclockwise when viewed from above when the spiral groove is traced from the base end to the tip end.

When rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove clockwise from the base end to the tip end. In other words, the spiral groove in this case is formed clockwise when viewed from above when the spiral groove is traced from the base end to the tip end. By setting the spiral groove in this way, the metal plastically fluidized during friction stir welding is guided to the tip end side of the stirring pin F2 by the spiral groove. As a result, the amount of metal that overflows to the outside of the metal member to be joined (main body 202 and lid member 203) can be reduced.

In this joining step, only the stirring pin F2 of the rotated rotation tool F is inserted into the butt portion J211 and friction stir welding is performed by tracing the butt portion J211 (not shown). Further, in this joining step, as shown in FIG. 11, friction stir welding is performed on the first butt portion J21. In the main joining step, the main step from the start position Sp to the intermediate point S1 by rotating the protrusion 216 around and the detaching step from the intermediate point S1 to the end position Ep are performed.

In this step, only the stirring pin F2 rotated clockwise is inserted into the start position Sp set on the surface 203a of the lid member 203, and the lid member 203 and the connecting portion F1 are separated from each other and moved counterclockwise with respect to the protruding portion 216. Let me. In other words, friction stirring is performed with the base end portion of the stirring pin F2 exposed. A plasticized region W1 is formed on the movement locus of the rotation tool F by hardening the frictionally agitated metal.

In this joining step, as shown in FIG. 12, the plastically fluidized metal is made to go around along the first butt portion J1 while flowing into the gap of the first butt portion J1. In the present embodiment, the outer peripheral surface F10 of the stirring pin F2 is slightly brought into contact with the step side surface 217b of the strut step portion 217, and the flat surface F3 of the stirring pin F2 is not brought into contact with the step bottom surface 217a.

Here, the contact allowance of the outer peripheral surface F10 of the stirring pin F2 with respect to the step side surface 217b is set to the offset amount N. When the outer peripheral surface F10 of the stirring pin F2 is brought into contact with the step side surface 217b and the flat surface F3 of the stirring pin F2 is not brought into contact with the step bottom surface 217a as in the present embodiment, the offset amount N is set to 0 <N ≦. It is set between 0.5 mm, preferably between 0 <N ≦ 0.25 mm.

As shown in FIG. 13, when the rotation tool F is made to go around the protrusion 216, the start position Sp is passed, and the start end and the end end of the plasticized region W1 are overlapped. When the stirring pin F2 reaches the intermediate point S1, the process proceeds to the detaching step as it is.

In the detaching step, the rotating tool F is moved along the inclined surface 250c of the inclined table 250 from the intermediate point S1 to the end position Ep while gradually raising the rotating tool F. More specifically, when the rotating tool F reaches the inclined table 250, the rotating tool F is moved along the inclined surface 250c while gradually separating the stirring pin F2 and the protrusion 216.

When the rotation tool F reaches the end position Ep, pull the rotation tool F upward to separate it. In this step and the detaching step, the insertion depth of the stirring pin F2 may be constant or variable.

The tilting table removing step is a step of removing the tilting table 250. In the inclined table removing step, for example, all the inclined table 250 is removed with reference to the tip surface 216a by cutting or grinding.

According to the joining method according to the present embodiment described above, the end position Ep of the rotation tool F is set to the inclined table 250, and the inclined table 250 is cut off. As a result, friction stir welding without leaving a pull-out hole and a pull-out mark on the column 215 becomes possible. Further, as a result, no pull-out hole or pull-out mark remains on the surface 203a of the support column 215 and the lid member 203, so that a clean finish can be achieved.

Further, since the rotating tool F is raised along the inclined surface 250c of the inclined table 250, when the rotating tool F is moved to the end position Ep, the stirring pin F2 and the tip surface 216a can be separated from each other. As a result, the pull-out hole generated when the rotary tool F is detached does not remain on the tip surface 216a, but can be left only on the inclined table 250.
Further, the inclined table 250 can be easily formed by integrally molding the main body 202 of the present embodiment, for example, by die casting. Further, since it is sufficient to raise the tilting table 250 along the inclined surface 250c at a constant insertion depth, complicated work such as changing the rotation speed of the rotation tool F can be omitted.

[Fifth Embodiment]
In the fifth embodiment, instead of the main body 202 and the lid member 203 of the fourth embodiment, the main body 202A and the lid member 203A are used differently as shown in FIGS. 14 to 16. For the members and the like common to the main body 202 and the lid member 203 and the main body 202A and the lid member 203A, the same reference numerals as those in the fourth embodiment are used, and detailed description thereof will be omitted.

As shown in FIG. 14, the bottom 210 is a plate-shaped member having a rectangular shape in a plan view. The peripheral wall portion 211 is a wall portion that rises in a rectangular frame shape from the peripheral edge portion of the bottom portion 210. A peripheral wall step portion 212 is formed on the inner peripheral edge of the peripheral wall portion 211. The peripheral wall step portion 212 is composed of a step bottom surface 212a and a step side surface 212b rising from the step bottom surface 212a. The step side surface 212b is inclined so as to spread outward from the step bottom surface 212a toward the opening as in the first embodiment. A recess 213 is formed in the bottom portion 210 and the peripheral wall portion 211.

As shown in FIG. 14, the support column 215A rises vertically from the bottom 210. The number of columns 215A is not particularly limited, but in the present embodiment, two columns are formed. Further, the shape of the support column 215A exhibits a rectangular columnar shape when viewed from above. A rectangular protrusion 216A is formed at the tip of the support column 215A. The height of the protruding portion 216A is smaller than the plate thickness of the lid member 203A.

By forming the projecting portion 216A, a strut step portion 217A is formed at the tip of the strut 215A. The strut step portion 217A is composed of a step bottom surface 217aA and a step side surface 217bA rising from the step bottom surface 217aA. The step bottom surface 217aA is formed at the same height position as the step bottom surface 212a of the peripheral wall step portion 212. The height dimension of the step side surface 217bA is smaller than the plate thickness of the lid member 213A. The step side surface 17bA is inclined so as to be separated from the hole wall 204aA so as to taper toward the tip.

The lid member 203A is a plate-shaped member that seals the opening of the main body 202A. The lid member 203A has a size to be placed on the peripheral wall step portion 212. The plate thickness of the lid member 203A is larger than the height of the step side surface 212b. The lid member 203A is formed with a rectangular hole 204A in a top view at a position corresponding to the support column 215A. The hole 204A is formed so that the protrusion 216A is fitted.

As shown in FIG. 15, an inclined table 250A is formed on the tip surface 216aA of the protruding portion 216A of each support column 215A. The inclined table 250A is composed of inclined table side surfaces 250aA and 250bA and an inclined surface 250cA. The inclined table side surfaces 250aA and 250bA are surfaces that rise vertically from the tip surface 216aA. The end of the inclined surface 250cA is in contact with the outer peripheral edge of the tip surface 216aA. The inclined table side surfaces 250aA and 250bA are formed at positions that do not interfere with the moving rotating tool F in the main step of the main joining step.

The preparation step, the mounting step, and the tilting table removing step are performed in the same manner as in the first embodiment. This joining step is also substantially the same as that of the fourth embodiment. That is, in this joining step, as shown in FIG. 15, the first butt portion J21A is friction-stir welded using the rotary tool F. As shown by an arrow in FIG. 15, only the stirring pin F2 rotated clockwise is inserted into the surface 203a (not shown in FIG. 15) of the lid member 203A, and the lid member 203A and the connecting portion F1 are separated from each other by the protruding portion. Move counterclockwise with respect to 216A. In other words, friction stirring is performed with the base end portion of the stirring pin F2 exposed.

More specifically, as shown in FIG. 16, in the main joining step, the main step from the start position Sp to the intermediate point S1 by rotating the protruding portion 216A and the detaching step from the intermediate point S1 to the end position EP1 are performed. .. In this step, the rotation tool F rotated clockwise is inserted at the start position Sp and moved counterclockwise with respect to the protrusion 216A. After rotating the rotation tool F once, it is moved as it is to overlap the plasticized region W1. When the rotation tool F reaches the intermediate point S1, the process proceeds to the detaching step without pulling out the stirring pin F2.

In the detaching step, the rotation tool F is moved along the inclined surface 250cA of the inclined table 250A from the intermediate point S1 to the end position Ep while gradually raising the rotating tool F. More specifically, when the rotating tool F reaches the inclined table 250A, the rotating tool F is moved along the inclined surface 250c while gradually separating the stirring pin F2 and the protrusion 216A. When the rotation tool F reaches the end position Ep, the rotation tool F is pulled upward to separate it. In this step and the detaching step, the insertion depth of the stirring pin F2 may be constant or variable.

According to the joining method of the fifth embodiment described above, the same effect as that of the fourth embodiment can be obtained. Further, as in the fifth embodiment, the tilting table 250A may be a rectangular shape in a plan view. As a result, the movement route of the rotation tool F can be simplified.

[Sixth Embodiment]
As shown in FIG. 17, the sixth embodiment differs from the fourth embodiment in that the tilting table 250D is provided not on the tip surface 216a but on the surface 203a of the lid member 203D. For the members and the like common to the fourth embodiment, the same reference numerals as those of the fourth embodiment are used, and detailed description thereof will be omitted.

The inclined table 250D is composed of inclined table side surfaces 250aD and 250bD and an inclined surface 250cD. The lower end of the inclined surface 250cD of the inclined table 250D faces the first butt portion J21D. It is preferable that the tilting table 250D is formed at a position where it does not interfere with the moving rotating tool F during the main step of the main joining step.

As shown in FIG. 17, in the main joining step according to the present embodiment, the rotation tool F is inserted at the start position Sp, made to make one or more turns along the first butt portion J21D, and then the rotation tool F is placed on the inclined table 250D. It is raised along the inclined surface 250cD, and the rotation tool F is released at the end position Ep. In the tilting table removing step, for example, the tilting table 250D is completely removed with reference to the surface 203a of the lid member 203D by cutting.

According to the joining method of the third embodiment described above, the same effect as that of the first embodiment can be obtained. As in this embodiment, the tilting table 250D may be provided on the surface 203a of the lid member 203D.

[First modification]
The shape of the tilting table can be adopted other than the above-described embodiment. The support column 215B of the first modification has a triangular columnar shape as shown in FIG. A triangular (triangular thrust) protruding portion 216B is formed at the tip of the support column 215B. By forming the projecting portion 216B, a strut step portion 217B is formed at the tip of the strut 215B. The strut step portion 217B is composed of a step bottom surface 217aB and a step side surface 217bB rising from the step bottom surface 217aB.

An inclined table 250B is formed on the protrusion 216B. The tilting table 250B is formed with an inclined surface 250cB having the outer peripheral edge of the protruding portion 216B as the lower end. The inclined surface 250cB is formed along the shape of the protrusion 216B. The tilting table 250B may be formed on the surface of the lid member as in the sixth embodiment.

[Second modification]
The support column 215C of the second modification has a square columnar shape as shown in FIG. A quadrangular (square thrust trap) protruding portion 216C is formed at the tip of the support column 215C. By forming the projecting portion 216C, a strut step portion 217C is formed at the tip of the strut 215C. The strut step portion 217C is composed of a step bottom surface 217aC and a step side surface 217bC rising from the step bottom surface 217aC.

An inclined table 250C is formed on the protrusion 216C. The tilting table 250C has a quadrangular pyramid shape. The lower end of the inclined surface 250cC of the inclined table 250C faces the protruding surface 216aC of the protruding portion 216C. The tilting table 250C may be formed on the surface of the lid member as in the sixth embodiment.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to the above-described embodiments and modifications, and various changes can be made without departing from the spirit of the present invention. ..

For example, the configuration as in the second embodiment may be applied to the inclined table formed on the lid member 3 in the third embodiment. That is, the lid member 3 may be provided with an inclined table so that the inclined direction of the inclined surface is perpendicular to the side surface 3c of the lid member 3.

For example, in the above-described embodiment and modification, the step side surface of the strut step portion is inclined, but it may be perpendicular to the step bottom surface.

1 Hollow container 2 Main body 3

Lid member

4, 4B, 4C Inclined table 10 Bottom 11 Peripheral wall 12 Peripheral wall step 12a Step bottom 12b Step side surface 13 Recess J1 First butt J2 Second butt F Rotating tool F1 Connecting part F2 Stirring Pin W plasticized area 204, 204A Hole part 204a, 204aA Hole wall 217a, 217aA, 217aB, 217aC Step bottom surface 217b, 217bA, 217bB, 217bC

Step side surface

215, 215A, 215B,

215C Support column

217, 217A,

217B Part

250, 250A, 250B, 250C, 250D Inclined table

Claims

It is a joining method in which a main body provided with a recess and a lid member for sealing the opening of the recess are joined by friction stir welding.
The outer peripheral surface of the stirring pin of the rotary tool used for friction stir is inclined so as to be tapered.
The main body has a bottom portion and a peripheral wall portion rising from the peripheral edge portion of the bottom portion, and the inner peripheral wall of the peripheral wall portion has a step bottom surface that is one step lower than the end surface of the peripheral wall portion and a step side surface that rises from the step bottom surface. A preparatory step of forming a stepped portion of the peripheral wall to have, and forming an inclined table that is close to the side surface of the stepped portion and protrudes from the end surface of the peripheral wall portion.
By placing the lid member on the main body, the step side surface of the peripheral wall step portion and the side surface of the lid member are abutted to form the first abutment portion, and the step bottom surface of the peripheral wall step portion and the lid member are formed. And the mounting process to form the second butt part by superimposing the back surface of
Only the rotating stirring pin is inserted into the first butt portion, and the rotating tool is moved along the first butt portion with only the stirring pin in contact with the peripheral wall step portion and the lid member. After performing friction stir, the main joining step of moving the stirrer so as to rise along the inclined surface of the inclined table and pulling out the stirring pin on the upper side of the inclined surface.
A joining method comprising a tilting table removing step of removing the tilting table.
It is a joining method in which a main body provided with a recess and a lid member for sealing the opening of the recess are joined by friction stir welding.
The outer peripheral surface of the stirring pin of the rotary tool used for friction stir is inclined so as to be tapered.
The main body has a bottom portion and a peripheral wall portion that rises from the peripheral edge portion of the bottom portion, and a step bottom surface that is one step lower than the end surface of the peripheral wall portion and a step side surface that rises from the step bottom surface are provided on the inner peripheral wall of the peripheral wall portion. A preparatory step of forming a stepped portion of the peripheral wall to have, approaching the side surface of the lid member, and forming an inclined table protruding from the surface of the lid member.
By placing the lid member on the main body, the step side surface of the peripheral wall step portion and the side surface of the lid member are abutted to form the first abutment portion, and the step bottom surface of the peripheral wall step portion and the lid member are formed. And the mounting process to form the second butt part by superimposing the back surface of
Only the rotating stirring pin is inserted into the first butt portion, and the rotating tool is moved along the first butt portion with only the stirring pin in contact with the peripheral wall step portion and the lid member. After performing friction stir, the main joining step of moving the stirrer so as to rise along the inclined surface of the inclined table and pulling out the stirring pin on the upper side of the inclined surface.
A joining method comprising a tilting table removing step of removing the tilting table.
It is a joining method in which a support column and a lid member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The outer peripheral surface of the stirring pin of the rotary tool used for friction stir is inclined so as to be tapered.
A preparatory step of forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface rising from the step bottom surface, and forming an inclined table at the tip of the strut.
By placing the lid member on the support column, the step side surface of the support column step portion and the hole wall of the hole portion are abutted to form the first abutment portion, and the step bottom surface of the support column step portion and the lid are formed. A mounting process in which the back surface of the member is overlapped to form a second butt portion,
Only the rotating stirring pin is inserted into the first butt portion, and the rotating tool is moved along the first butt portion with only the stirring pin in contact with the support column step portion and the lid member. After performing friction stir, the main joining step of moving the stirrer so as to rise along the inclined surface of the inclined table and pulling out the stirring pin on the upper side of the inclined surface.
A joining method comprising a tilting table removing step of removing the tilting table.
It is a joining method in which a support column and a lid member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The outer peripheral surface of the stirring pin of the rotary tool used for friction stir is inclined so as to be tapered.
A preparatory step of forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface rising from the step bottom surface, and forming an inclined table on the surface of the lid member.
By placing the lid member on the support column, the step side surface of the support column step portion and the hole wall of the hole portion are abutted to form the first abutment portion, and the step bottom surface of the support column step portion and the lid are formed. A mounting process in which the back surface of the member is overlapped to form a second butt portion,
Only the rotating stirring pin is inserted into the first butt portion, and the rotating tool is moved along the first butt portion with only the stirring pin in contact with the support column step portion and the lid member. After performing friction stir, the main joining step of moving the stirrer so as to rise along the inclined surface of the inclined table and pulling out the stirring pin on the upper side of the inclined surface.
A joining method comprising a tilting table removing step of removing the tilting table.