JP2021112751A - Joining method - Google Patents

Abstract

To provide a joining method capable of appropriately joining columns and components of different materials.SOLUTION: A joining method includes: a preparation process for forming a column step part 17; a placement process for placing a component (sealing body) 3 on a column 15; and a regular joining process for inserting only a rotating agitation pin F2 into the component 3, and performing friction agitation on a first abutting part J1 while pouring a second aluminum alloy, which is the component 3, into the gap at the time of moving a rotary tool F along a set moving route L1 which is set on the surface of the component 3 in a state where the outer circumferential surface F10 of the agitation pin F2 is brought into slight contact with a step side surface 17b of the column step part 17. In the regular joining process, the rotating agitation pin F2 is inserted from the start position set on the set moving route, and the agitation pin F2 is gradually pushed in while being moved in the advancing direction thereof until reaching a predetermined depth.SELECTED DRAWING: Figure 3

Description

The present invention relates to a joining method.

For example, Patent Document 1 discloses a method for manufacturing a liquid-cooled jacket. FIG. 11 is a cross-sectional view showing a conventional method for manufacturing a liquid-cooled jacket. In the conventional method for manufacturing a liquid-cooled jacket, the butt portion J10 formed by abutting the step side surface 101c provided on the step portion of the aluminum alloy jacket body 101 and the side surface 102c of the aluminum alloy sealing body 102. This is to perform friction stir welding. Further, in the conventional method for manufacturing a liquid-cooled jacket, only the stirring pin F2 of the rotating tool F is inserted into the butt portion J10 to perform friction stir welding. Further, in the conventional method for manufacturing a liquid-cooled jacket, the rotation center axis Z of the rotation tool F is overlapped with the butt portion J10 and relatively moved.

Japanese Unexamined Patent Publication No. 2015-131321

Here, the jacket body 101 tends to have a complicated shape. For example, a jacket body 101 formed of a cast material of 4000 series aluminum alloy and a relatively simple shape such as a sealing body 102 is a wrought material of 1000 series aluminum alloy. In some cases, it is formed by. In this way, a liquid-cooled jacket may be manufactured by joining members of different grades of aluminum alloy. In such a case, the jacket body 101 generally has a higher hardness than the sealing body 102. Therefore, when friction stir welding is performed as shown in FIG. 11, the stirring pin is on the sealing body 102 side. The material resistance received from the jacket body 101 side is larger than the material resistance received from the jacket body 101. Therefore, it becomes difficult to stir different grades in a well-balanced manner by the stirring pin of the rotary tool F, and there is a problem that cavity defects occur in the plasticized region after joining and the joining strength decreases.

Further, when the stirring pin F2 is inserted into the butt portion J10, the stirring pin F2 is pushed in in the vertical direction until it reaches a predetermined depth, so that the frictional heat at the start position of frictional stirring becomes excessive. As a result, at the start position, the metal on the jacket body 101 side is likely to be mixed into the sealing body 102, which causes a problem of contributing to poor joining.

On the other hand, when the stirring pin F2 is pulled out from the butt portion J10 and separated, the stirring pin F2 is pulled out in the vertical direction, so that the frictional heat at the end position of frictional stirring becomes excessive. As a result, at the end position, the metal on the jacket body 101 side is likely to be mixed into the sealing body 102, which causes a problem of contributing to poor joining.

From such a viewpoint, it is an object of the present invention to provide a joining method capable of suitably joining columns and members of different grades.

In order to solve the above problems, the present invention is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding, and the support column is formed of a first aluminum alloy. The member is made of a second aluminum alloy, the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of a stirring pin of a rotary tool used for friction stir welding. Is inclined so as to be tapered, and is prepared to form a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered. In the process and by placing the member on the support column, the first butt portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the first butt portion is formed. A mounting step of superimposing the step bottom surface of the strut step portion and the back surface of the member to form a second butt portion, and inserting only the rotating stir pin into the member, and the outer peripheral surface of the stir pin is the strut. While slightly contacting the step side surface of the step portion, when the rotation tool is moved along the set movement route set on the surface of the member, the second aluminum alloy of the member is allowed to flow into the gap. The main joining step of performing friction stir welding on the first butt portion is included, and in the main joining step, the stirring pin that rotates from the set start position on the set movement route is inserted and moved in the traveling direction. The stirring pin is gradually pushed in until it reaches a predetermined depth.

Further, the present invention is a joining method in which a strut and a member having a hole into which the tip of the strut is inserted are joined by frictional agitation. The strut is made of a first aluminum alloy, and the member. Is formed of a second aluminum alloy, the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is tapered. A preparatory step for forming a strut step portion that is inclined and has a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered, and the strut By placing the member, the first abutting portion is formed so that there is a gap when the step side surface of the strut step portion and the hole wall of the hole portion are abutted, and the step bottom surface of the strut step portion is formed. And the back surface of the member are overlapped to form a second abutting portion, and only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is placed on the step side surface of the support column step portion. When the rotating tool is moved along the set movement route set on the surface of the member in a slightly contacted state, the second aluminum alloy of the member is allowed to flow into the gap and into the first butt portion. In the main joining step, the rotating stirring pin is inserted into a start position set further away from the support column than the set movement route, and then the above-mentioned The stirring pin is gradually pushed in until it reaches a predetermined depth while moving the rotation center axis of the rotation tool to a position overlapping the set movement route.

Further, the present invention is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding. The support column is made of a first aluminum alloy, and the member Is formed of a second aluminum alloy, the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stir welding is tapered. A preparatory step for forming a strut step portion that is inclined and has a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered, and the strut By placing the member, the first abutting portion is formed so that there is a gap when the step side surface of the strut step portion and the hole wall of the hole portion are butted, and the step bottom surface of the strut step portion is formed. And the back surface of the member are overlapped to form a second butt portion, and only the rotating stir pin is inserted into the member, and the outer peripheral surface of the stir pin is placed on the step side surface of the strut step portion. When the rotation tool is moved along the set movement route set on the surface of the member in a slightly contacted state, the second aluminum alloy of the member is allowed to flow into the gap and into the first butt portion. In the main joining step, the end position is set on the set movement route, and after friction stir welding with respect to the first butt portion, the rotation tool is moved to the end position. The stirring pin is gradually pulled out while being moved to, and the rotating tool is separated from the member at the end position.

Further, the present invention is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding. The support column is made of a first aluminum alloy, and the member Is formed of a second aluminum alloy, the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stir welding is tapered. A preparatory step for forming a strut step portion that is inclined and has a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered, and the strut By placing the member, the first abutting portion is formed so that there is a gap when the step side surface of the strut step portion and the hole wall of the hole portion are butted, and the step bottom surface of the strut step portion is formed. And the back surface of the member are overlapped to form a second butt portion, and only the rotating stir pin is inserted into the member, and the outer peripheral surface of the stir pin is placed on the step side surface of the strut step portion. When the rotation tool is moved along the set movement route set on the surface of the member in a slightly contacted state, the second aluminum alloy of the member is allowed to flow into the gap and into the first butt portion. In the main joining step, the end position is set on a side further away from the support column than the set movement route, and after friction stirring with respect to the first butt portion, the main joining step of performing friction stir welding is included. The stirring pin is gradually pulled out while moving the rotation tool to the end position, and the rotation tool is separated from the member at the end position.

According to such a joining method, the second aluminum alloy mainly on the member side of the first butt portion is agitated and plastically fluidized by the frictional heat between the member and the stirring pin, and the step side surface and the hole of the column step portion are formed in the first butt portion. It can be joined to the hole wall of the part. Further, since the outer peripheral surface of the stirring pin is kept in contact with the step side surface of the strut step portion slightly, it is possible to minimize the mixing of the first aluminum alloy from the strut to the member. As a result, in the first butt portion, the second aluminum alloy on the member side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed.

Further, by gradually pushing the stirring pin until it reaches a predetermined depth while moving the rotation tool on the set movement route, it is possible to prevent the frictional heat from becoming excessive at one point of the set movement route.
Further, by gradually pushing the stirring pin until it reaches a predetermined depth while moving the rotation tool to a position overlapping the set movement route, it is possible to prevent the frictional heat from becoming excessive on the set movement route.

Further, by gradually pulling out the stirring pin while moving the rotation tool on the set movement route, it is possible to prevent the frictional heat from becoming excessive at one point of the set movement route.
Further, by gradually pulling out the stirring pin while moving the rotation tool from a position overlapping the set movement route, it is possible to prevent the frictional heat from becoming excessive on the set movement route.
As a result, it is possible to prevent the first aluminum alloy of the column from being mixed into the member side on the set movement route.

Further, in the main joining step, the rotary tool may be moved along the second butt portion to perform frictional stirring in a state where the stirring pin is slightly in contact with the step bottom surface of the support column step portion. preferable.

According to such a joining method, the joining strength can be increased, and the mixing of the first aluminum alloy from the support column side to the member side can be prevented as much as possible.

Further, in the preparation step, it is preferable to set the thickness of the member to be larger than the height dimension of the step side surface of the support column step portion.

According to such a joining method, it is possible to prevent a metal shortage at the joining portion.

Further, it is preferable to set the traveling direction and the rotation direction of the rotation tool so that the advancing side of the rotation tool is the support column side.

According to such a joining method, the friction stir welding action on the first butt portion side is enhanced, and the temperature can be expected to rise, so that the joining strength can be further increased.

Further, the present invention is a joining method in which a strut and a member having a hole into which the tip of the strut is inserted are joined by frictional agitation. The strut is made of copper or a copper alloy, and the member. Is made of aluminum or an aluminum alloy, and the outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered. A preparatory step of forming a strut stepped portion having a stepped side surface that rises diagonally so that the tip is tapered, and a stepped side surface of the strut stepped portion and the hole portion by placing the member on the strut. A mounting step of forming a first butt portion so that there is a gap when the hole wall is abutted, and superimposing the step bottom surface of the support column step portion and the back surface of the member to form a second butt portion. Then, only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the support column step portion, and the stirring pin is set along the set movement route set on the surface of the member. In the main joining step, the set movement includes a main joining step of frictionally stirring the first butt portion while flowing aluminum or an aluminum alloy of the member into the gap when moving the rotary tool. The stirring pin that rotates from the start position set on the route is inserted, and the stirring pin is gradually pushed in until it reaches a predetermined depth while moving in the traveling direction.

Further, the present invention is a joining method in which a strut and a member having a hole into which the tip of the strut is inserted are joined by frictional agitation. The strut is made of copper or a copper alloy, and the member. Is made of aluminum or an aluminum alloy, and the outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered. A preparatory step of forming a strut stepped portion having a stepped side surface that rises diagonally so that the tip is tapered, and a stepped side surface of the strut stepped portion and the hole portion by placing the member on the strut. A mounting step of forming a first butt portion so that there is a gap when the hole wall is abutted, and superimposing the step bottom surface of the support column step portion and the back surface of the member to form a second butt portion. Then, only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the support column step portion, and the stirring pin is set along the set movement route set on the surface of the member. The rotating tool includes a main joining step of performing frictional agitation with respect to the first butt portion while flowing aluminum or an aluminum alloy of the member into the gap when moving the rotating tool. After inserting the stirring pin into the start position set on the side further away from the support column from the set movement route, the rotation center axis of the rotation tool is moved to a position overlapping the set movement route to reach a predetermined depth. It is characterized in that the stirring pin is gradually pushed in until it becomes.

Further, the present invention is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by frictional stirring. The support column is made of copper or a copper alloy, and the member is formed of copper or a copper alloy. Is made of aluminum or an aluminum alloy, and the outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered. A preparatory step of forming a strut stepped portion having a stepped side surface that rises diagonally so that the tip is tapered, and a stepped side surface of the strut stepped portion and the hole portion by placing the member on the strut. A mounting step of forming a first butt portion so that there is a gap when the hole wall is abutted, and superimposing the step bottom surface of the support column step portion and the back surface of the member to form a second butt portion. Then, only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the support column step portion, and the stirring pin is set along the set movement route set on the surface of the member. In the main joining step, the set movement includes a main joining step of frictionally stirring the first butt portion while flowing aluminum or an aluminum alloy of the member into the gap when moving the rotary tool. An end position is set on the route, and after frictional stirring with respect to the first butt portion, the stirring pin is gradually pulled out while moving the rotation tool to the end position, and the rotation tool is removed from the member at the end position. It is characterized by being separated.

Further, the present invention is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by frictional stirring. The support column is made of copper or a copper alloy, and the member is formed of copper or a copper alloy. Is made of aluminum or an aluminum alloy, and the outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered. A preparatory step of forming a strut stepped portion having a stepped side surface that rises diagonally so that the tip is tapered, and a stepped side surface of the strut stepped portion and the hole portion by mounting the member on the strut. A mounting step of forming a first butt portion so that there is a gap when the hole wall is abutted, and superimposing the step bottom surface of the support column step portion and the back surface of the member to form a second butt portion. Then, only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the support column step portion, and the stirring pin is set along the set movement route set on the surface of the member. In the main joining step, the set movement includes a main joining step of frictionally stirring the first butt portion while flowing aluminum or an aluminum alloy of the member into the gap when moving the rotary tool. The end position is set on the side further away from the support column from the root, and after frictional stirring with respect to the first butt portion, the stirring pin is gradually pulled out while moving the rotation tool to the end position to reach the end position. It is characterized in that the rotating tool is detached from the member.

According to such a joining method, the aluminum or aluminum alloy mainly on the member side of the first butt portion is agitated and plastically fluidized by the frictional heat between the member and the stirring pin, and the step side surface and the hole of the column step portion are formed in the first butt portion. It can be joined to the hole wall of the part. Further, since the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the strut step portion, copper or copper alloy is hardly mixed from the strut to the member. As a result, since the aluminum or aluminum alloy on the member side is mainly frictionally agitated in the first butt portion, it is possible to suppress a decrease in joint strength.

Further, by gradually pushing the stirring pin until it reaches a predetermined depth while moving the rotation tool on the set movement route, it is possible to prevent the frictional heat from becoming excessive at one point of the set movement route.
Further, by gradually pushing the stirring pin until it reaches a predetermined depth while moving the rotation tool to a position overlapping the set movement route, it is possible to prevent the frictional heat from becoming excessive on the set movement route.

Further, by gradually pulling out the stirring pin while moving the rotation tool on the set movement route, it is possible to prevent the frictional heat from becoming excessive at one point of the set movement route.
Further, by gradually pulling out the stirring pin while moving the rotation tool from a position overlapping the set movement route, it is possible to prevent the frictional heat from becoming excessive on the set movement route.
As a result, it is possible to prevent the copper or copper alloy of the columns from being mixed into the member side on the set movement route.

Further, in the preparatory step, it is preferable to set the thickness of the member so as to be larger than the height dimension of the step side surface of the strut step portion.

According to such a joining method, it is possible to prevent a metal shortage at the joining portion.

Further, it is preferable to set the traveling direction and the rotation direction of the rotation tool so that the advancing side of the rotation tool is the support column side.

According to such a joining method, the friction stir welding action on the first butt portion side is enhanced, and the temperature can be expected to rise, so that the joining strength can be further increased.

Further, in this joining step, it is preferable to move the rotating tool along the first butt portion and make it go around the support column to perform friction stir welding.

According to such a joining method, the joining strength between the column and the member can be further increased.

According to the joining method according to the present invention, columns and members of different grades can be preferably joined.

It is a 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. It is a perspective view which shows the main joining process of the joining method which concerns on 1st Embodiment. It is sectional drawing which shows the main joining process of the joining method which concerns on 1st Embodiment. It is a top view which shows the state after the main joining process of the joining method which concerns on 1st Embodiment. It is a top view which shows the state after the main joining process of the joining method which concerns on 1st Embodiment. It is a perspective view which shows the main joining process of the joining method which concerns on 2nd Embodiment. It is a top view which shows the state after the main joining process of the joining method which concerns on 2nd Embodiment. It is a top view which shows the state after the main joining process of the joining method which concerns on 2nd Embodiment. It is sectional drawing which shows the joining process of the joining method which concerns on a modification. It is sectional drawing which shows the manufacturing method of the conventional liquid-cooled jacket.

[First Embodiment]
The joining method according to the first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the joining method of the present embodiment is to join the support column 15 and the member (hereinafter, also referred to as “sealing body”) 3 by friction stir welding. Here, the support column 15 is joined. An example shows a case where the provided jacket body 2 and the sealing body 3 are joined. The present invention is a joining method for joining a support column and a member, and the shape of the support column, the shape of the member, the application, and the like are not particularly limited.

The joining method of the present embodiment is to manufacture a liquid-cooled jacket 1 by friction-stir welding the jacket body 2 and the sealing body 3. The liquid-cooled jacket 1 is a member in which a heating element (not shown) is installed on the sealing body 3 and a fluid is allowed to flow inside to exchange heat with the heating element. The "front surface" in the following description means the surface opposite to the "back surface".

The joining method according to the present embodiment includes a preparation step, a mounting step, and a main joining step. The preparation step is a step of preparing the jacket body 2 and the sealing body 3. The jacket body 2 is mainly composed of a bottom portion 10, a peripheral wall portion 11, and a plurality of columns 15. The jacket body 2 is formed mainly containing a first aluminum alloy. As the first aluminum alloy, for example, an aluminum alloy casting material such as JISH5302 ADC12 (Al—Si—Cu system) is used.

As shown in FIG. 1, the bottom portion 10 is a plate-shaped member having a rectangular shape in a plan view. The peripheral wall portion 11 is a wall portion that rises in a rectangular frame shape from the peripheral edge portion of the bottom portion 10. A peripheral wall step portion 12 is formed on the inner peripheral edge 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. As shown in FIG. 2, the step side surface 12b is inclined so as to spread outward from the step bottom surface 12a toward the opening. The inclination angle β of the step side surface 12b may be appropriately set, and is, for example, 3 ° to 30 ° with respect to the vertical plane. A recess 13 is formed in the bottom portion 10 and the peripheral wall portion 11.

As shown in FIG. 1, the support column 15 rises vertically from the bottom portion 10. The number of columns 15 is not particularly limited, but in the present embodiment, four columns are formed. Further, although the shape of the support column 15 is columnar in the present embodiment, it may be another shape such as a prism. A protrusion 16 is formed at the tip of the support column 15. The shape of the protruding portion 16 is not particularly limited, but in the present embodiment, it has a truncated cone shape. The height of the protruding portion 16 is smaller than the plate thickness of the sealing body 3.

By forming the projecting portion 16, a strut step portion 17 is formed at the tip of the strut 15. The strut step portion 17 is composed of a step bottom surface 17a and a step side surface 17b rising from the step bottom surface 17a. The step bottom surface 17a is formed at the same height as the step bottom surface 12a of the peripheral wall step portion 12. The height dimension of the step side surface 17b is smaller than the plate thickness of the sealing body 3. The step side surface 17b is inclined so as to be separated from the hole wall 4a so as to taper toward the tip.

The sealing body 3 is a plate-shaped member that seals the opening of the jacket body 2. The sealing body 3 has a size to be placed on the peripheral wall step portion 12. The plate thickness of the sealing body 3 is larger than the height of the step side surface 12b. A hole 4 is formed in the sealing body 3 at a position corresponding to the support column 15. The hole 4 is formed so that the protrusion 16 is fitted. The sealing body 3 is formed mainly containing a second aluminum alloy. The second aluminum alloy is a material having a lower hardness than the first aluminum alloy. The second aluminum alloy is formed of, for example, an aluminum alloy wrought material such as JIS A1050, A1100, A6063. In the present specification, the hardness refers to Brinell hardness, which can be measured by a method according to JIS Z 2243.

As shown in FIG. 2, the mounting step is a step of mounting the sealing body 3 on the jacket body 2. In the mounting step, the back surface 3b of the sealing body 3 is mounted on the bottom surface 12a of the step. The step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are abutted to form the butt portion J11. Further, the step bottom surface 12a and the back surface 3b of the sealing body 3 are abutted to form the butt portion J12.

Further, in the mounting step, the hole wall 4a of the hole portion 4 and the step side surface 17b of the column step portion 17 are abutted to form the first abutting portion J1. The first abutment portion J1 may include a case where the hole wall 4a and the step side surface 17b of the strut step portion 17 are butted with a gap having a substantially V-shaped cross section. Further, the back surface 3b of the sealing body 3 and the step bottom surface 17a of the column step portion 17 are butted to form the second butted portion J2.

As shown in FIGS. 3 and 4, this joining step is a step of friction stir welding the first butt portion J1 using the rotary 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. 4, a flat flat surface F3 that is perpendicular to the rotation center axis Z 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 Z and the outer peripheral surface F10 of the stirring pin F2 may be appropriately set in the range of, for example, 5 ° to 30 °. It is set to be the same as the inclination angle β of the step side surface 12b of the step 12 and the inclination angle γ (see FIG. 2) of the step side surface 17b of the support column step portion 17.

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 the rotation tool F is rotated 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 (jacket body 2 and sealing body 3) can be reduced.

As shown in FIGS. 3 and 4, this joining step is a step of friction stir welding the first butt portion J1 using the rotary tool F. In this joining step, the intrusion section from the start position SP to the intermediate point S1 (see FIG. 5), the main section from the intermediate point S1 on the set movement route L1 to the intermediate point S2 (see FIG. 5), and the intermediate point S2 (see FIG. 5). The three sections of the detachment section from the intermediate point S2 to the end position EP (see FIG. 5) are continuously frictionally agitated. The intermediate points S1 and S2 are set on the set movement route L1.

The set movement route L1 has an annular shape and is set so as to surround the protrusion 16. The set movement route L1 is preferably set outside the hole wall 4a of the hole portion 4, but may be set inside the hole wall 4a or at a position of the hole wall 4a. The distance from the set movement route L1 to the hole wall 4a should be constant (that is, the set movement route L1 and the hole wall 4a should be concentric circles). In the closet section, only the stirring pin F2 rotated clockwise is inserted into the start position SP set on the set movement route L1, and the stirring pin F2 is lowered to a predetermined depth while moving in the traveling direction to form the sealant 3. Gradually push into.

When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section as it is. As shown in FIGS. 4 and 5, in this section, the rotation tool F is moved by a predetermined depth while overlapping the rotation center axis Z and the set movement route L1. The “predetermined depth” means the depth at which the stirring pin F2 is inserted in this section from the intermediate point S1 to the intermediate point S2 on the set movement route L1. In this section, the “predetermined depth” of the stirring pin F2 is set so that the flat surface F3 at the tip of the stirring pin F2 does not reach the step bottom surface 17a. The "predetermined depth" of the stirring pin F2 may be appropriately set, and for example, the flat surface F3 of the stirring pin F2 may be set so as to reach the step bottom surface 17a.

In this section of the main joining step, as shown in FIG. 4, the outer peripheral surface F10 of the stirring pin F2 is slightly brought into contact with the step side surface 17b of the column step portion 17. In this state, when the rotary tool F is moved counterclockwise along the first butt portion J1, friction stir is performed while the second aluminum alloy of the sealing body 3 is allowed to flow into the gap of the first butt portion J1. .. At this time, at least the contact between the outer peripheral surface F10 of the stirring pin F2 and the step side surface 17b of the strut step portion 17 slightly scrapes off the first aluminum alloy on the strut 15 side, and the first aluminum alloy is moved to the sealing body 3 side. mixing. A plasticized region W1 is formed on the movement locus of the rotation tool F by hardening the frictionally agitated metal.

Here, the contact allowance of the outer peripheral surface F10 of the stirring pin F2 with respect to the step side surface 17b is defined as the offset amount N. When the outer peripheral surface F10 of the stirring pin F2 is slightly brought into contact with the step side surface 17b and the flat surface F3 of the stirring pin F2 is not brought into contact with the step bottom surface 17a as in the present embodiment, the offset amount N is set to, for example, It is set between 0 <N ≦ 0.5 mm, preferably between 0 <N ≦ 0.25 mm.

As shown in FIG. 5, when the rotation tool F makes a round around the protrusion 16 along the set movement route L1 and reaches the intermediate point S2, the rotation tool F shifts to the departure section as it is. In the detachment section, the stirring pin F2 is raised and gradually pulled out while moving the rotation tool F to the end position EP set on the set movement route L1, and the rotation tool F is detached from the sealing body 3 at the end position EP. As shown in FIG. 7, the end position EP may be set on the side further away from the support column 15 than the set movement route L1 (that is, outside the set movement route L1). Even in that case, after the rotation tool F is made to go around the protrusion 16 along the set movement route L1, the stirring pin F2 is moved while moving the rotation tool F to the end position EP set outside the set movement route L1. It is gradually pulled out from the sealing body 3, and the rotating tool F is separated from the sealing body 3 at the end position EP.

According to the joining method according to the present embodiment described above, the second aluminum alloy mainly on the sealing body 3 side of the first butt portion J1 is stirred by the frictional heat between the sealing body (member) 3 and the stirring pin F2. The step side surface 17b of the column step portion 17 and the hole wall 4a of the hole portion 4 can be joined at the first butt portion J1. Further, since the outer peripheral surface F10 of the stirring pin F2 is kept in contact with the step side surface 17b of the column step portion 17 slightly, it is possible to minimize the mixing of the first aluminum alloy from the column 15 into the sealing body 3. As a result, in the first butt portion J1, the second aluminum alloy on the sealing body 3 side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed.

Further, in the closet section of the main joining process shown in FIGS. 5 and 6, the set movement route is moved by gradually pushing the stirring pin F2 until the depth reaches a predetermined depth while moving the rotation tool F on the set movement route L1. It is possible to prevent the frictional heat from becoming excessive at one point of L1.
Further, in the detachment section of the main joining step shown in FIG. 5, the frictional heat becomes excessive at one point of the set movement route L1 by gradually pulling out the stirring pin F2 while moving the rotation tool F on the set movement route L1. Can be prevented.

Further, in the detachment section of the main joining step shown in FIG. 6, the frictional heat is excessive on the set movement route L1 by gradually pulling out the stirring pin F2 while moving the rotation tool F from the position overlapping the set movement route L1. Can be prevented from becoming.
As a result, it is possible to prevent the first aluminum alloy of the support column 15 from being mixed into the sealing body (member) 3 side on the set movement route L1.

Further, in the preparation step, it is preferable to set the thickness of the sealing body 3 so as to be larger than the height dimension of the step side surface 17b of the column step portion 17. According to such a joining method, it is possible to prevent a metal shortage at the joining portion.

Further, in the main joining step, the rotation direction and the traveling direction of the rotating tool F may be appropriately set, but the traveling direction and the rotating direction of the rotating tool F are set so that the advancing side of the rotating tool F is the support column 15 side. It is preferable to do so. According to such a joining method, the friction stir welding action on the first butt portion J1 side is enhanced, and the temperature can be expected to rise, so that the joining strength can be further increased.

The shear side (Advancing side) is the relative speed of the outer circumference of the rotating tool with respect to the jointed portion, which is the value obtained by adding the magnitude of the moving speed to the magnitude of the tangential velocity on the outer circumference of the rotating tool. Means the side. On the other hand, the flow side (Retreating side) refers to the side in which the relative speed of the rotating tool with respect to the joint is reduced by rotating the rotating tool in the direction opposite to the moving direction of the rotating tool.

Further, since the step side surface 17b of the support column step portion 17 is inclined toward the axis center side of the support column 15, contact between the stirring pin F2 and the step side surface 17b can be easily avoided. Further, in the present embodiment, the inclination angle γ of the step side surface 17b and the inclination angle α of the stirring pin F2 are the same (the step side surface 17b and the outer peripheral surface F10 of the stirring pin F2 are parallel), so that the contact is well-balanced. Can be made to.

Further, in this joining step, the step bottom surface 17a of the column step portion 17 and the flat surface F3 of the stirring pin F2 are separated from each other, but the plasticized region W1 reaches the step bottom surface 17a. Thereby, the joint strength of the second butt portion J2 can be increased. Further, in this joining step, since the rotary tool F is moved along the first butt portion J1 and circulates around the support column 15 to perform friction stir welding, the joining strength can be increased and the first butt portion J1 Watertightness and airtightness can be improved. Further, in this joining step, since only the stirring pin F2 of the rotary tool F is inserted into the sealing body 3 and the support column 15 and the base end side of the stirring pin F2 is exposed, friction stirring is performed. The load acting on the can be reduced.

In this joining step, even if the rotary tool F is moved along the second butt portion J2 to perform frictional stirring with the stirring pin F2 slightly in contact with the step bottom surface 17a of the support column step portion 17. Good (not shown). According to such a joining method, the joining strength can be further increased, and the mixing of the first aluminum alloy from the support column 15 side to the sealing body 3 side can be prevented as much as possible. Further, the butt portions J11 and J12 may be appropriately joined by a method such as friction stir welding.

[Second Embodiment]
The joining method according to the second embodiment of the present invention will be described in detail with reference to the drawings. Since the difference from the first embodiment is the main joining step, the differences in the main joining step will be described below, and the description of the preparation step and the mounting step will be omitted.

In the main joining step of the present embodiment, the setting of the start position SP is different from that of the first embodiment. In the first embodiment, the start position SP was set on the set movement route L1 as shown in FIG. 3, but in the second embodiment, as shown in FIG. 7, the start position SP is further set from the support column 15 than the set movement route L1. The start position SP is set on the separated side (that is, outside the set movement route L1). In the present embodiment, only the stirring pin F2 rotated clockwise is inserted into the start position SP set outside the set movement route L1, and the stirring pin is moved to the intermediate point S1 on the set movement route L1 until it reaches a predetermined depth. F2 is lowered and gradually pushed into the sealing body 3. Then, the rotating tool F is moved counterclockwise with respect to the protruding portion 16 while keeping the sealing body 3 and the connecting portion F1 away from each other. In other words, friction stir 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.

As shown in FIG. 8, when the rotation tool F is made to go around the protrusion 16 along the set movement route L1, the rotation tool F is moved to the end position EP set on the set movement route L1 and the intermediate point S2. The stirring pin F2 is raised from the sealing body 3 and gradually pulled out from the sealing body 3, and the rotating tool F is separated from the sealing body 3 at the end position EP. As shown in FIG. 9, the end position EP may be set on the side further away from the support column 15 than the set movement route L1 (that is, outside the set movement route L1). Even in that case, after the rotation tool F is made to go around the protrusion 16 along the set movement route L1, the rotation tool F is moved to the end position EP set outside the set movement route L1 from the intermediate point S2. The stirring pin F2 is raised and gradually pulled out from the sealing body 3, and the rotating tool F is separated from the sealing body 3 at the end position EP.

The joining method according to the present embodiment described above can also achieve substantially the same effect as that of the first embodiment.
For example, in the closet section of the main joining process shown in FIGS. 8 and 9, the stirring pin F2 is gradually pushed in until it reaches a predetermined depth while moving the rotation tool F to a position overlapping the set movement route L1. It is possible to prevent the frictional heat from becoming excessive on the set movement route L1.

Further, in the detachment section of the main joining step shown in FIG. 8, the frictional heat becomes excessive at one point of the set movement route L1 by gradually pulling out the stirring pin F2 while moving the rotation tool F on the set movement route L1. Can be prevented.
Further, in the detachment section of the main joining step shown in FIG. 9, the frictional heat is excessive on the set movement route L1 by gradually pulling out the stirring pin F2 while moving the rotation tool F from the position overlapping the set movement route L1. Can be prevented from becoming.

As a result, it is possible to prevent the first aluminum alloy of the support column 15 from being mixed into the sealing body (member) 3 side on the set movement route L1.

[Modification example]
The joining method according to the modified example of the present invention will be described. In the modified example, as shown in FIG. 10, the materials of the jacket body 2 and the sealing body 3 are different in the preparation step, and the form of the main joining step is different from the first embodiment and the second embodiment. In the preparation step of the modification, the jacket body 2 is formed of copper or a copper alloy.

In the main joining step of the modified example, as shown in FIG. 10, the jacket body 2 and the sealing body 3 are friction-stir welded using the rotary tool F. In this joining step, friction stir welding is performed by circling around the protruding portion 16 in a state where the outer peripheral surface F10 of the stirring pin F2 is not in contact with the step side surface 17b of the column step 17. In this embodiment, the tip of the stirring pin F2 is set so as not to come into contact with the step bottom surface 17a.

If the distance from the step side surface 17b to the outer peripheral surface F10 of the stirring pin F2 is too long, the joint strength of the first butt portion J1 decreases. The separation distance L from the step side surface 17b to the outer peripheral surface F10 of the stirring pin F2 may be appropriately set depending on the material of the step side surface 17b and the sealing body 3, but the outer peripheral surface F10 of the stirring pin F2 is stepped as in the present embodiment. When the flat surface F3 is not brought into contact with the step bottom surface 17a without contacting the side surface 17b, it is preferable to set, for example, 0 ≦ L ≦ 0.5 mm, preferably 0 ≦ L ≦ 0.3 mm. .. The start position SP, end position EP, and intermediate points S1 and S2 in the modified example are set in the same manner as in the first embodiment or the second embodiment.

According to the modification described above, the stirring pin F2 of the rotating tool F and the step side surface 17b of the support column step portion 17 are not in contact with each other, but the first butt portion is caused by the frictional heat between the sealing body 3 and the stirring pin F2. The aluminum alloy mainly on the sealing body 3 side of J1 is agitated and plastically fluidized, and the step side surface 17b and the hole wall 4a of the hole 4 can be joined at the first butt portion J1. Further, since only the stirring pin F2 is brought into contact with only the sealing body 3 to perform frictional stirring, copper or a copper alloy is hardly mixed into the sealing body 3 from the support column 15. As a result, in the first butt portion J1, the aluminum alloy on the sealing body 3 side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed.

Further, in the closet section of the main joining process, the frictional heat is generated at one point of the set movement route L1 by gradually pushing the stirring pin F2 until the depth reaches a predetermined depth while moving the rotation tool F on the set movement route L1. It can be prevented from becoming excessive.
Further, in the closet section of the main joining process, the rotation tool F is moved to a position overlapping the set movement route L1 and the stirring pin F2 is gradually pushed in until it reaches a predetermined depth, thereby friction on the set movement route L1. It is possible to prevent the heat from becoming excessive.

Further, in the detachment section of the main joining step, the frictional heat is prevented from becoming excessive at one point of the set movement route L1 by gradually pulling out the stirring pin F2 while moving the rotation tool F on the set movement route L1. Can be done.
Further, in the detachment section of the main joining step, the frictional heat becomes excessive on the set movement route L1 by gradually pulling out the stirring pin F2 while moving the rotation tool F from the position overlapping with the set movement route L1. Can be prevented.

As a result, it is possible to prevent the copper or the copper alloy of the support column 15 from being mixed into the sealing body (member) 3 side on the set movement route L1.

Further, in the present embodiment, a gap having a V-shaped cross section is formed in the first butt portion J1, but by making the plate thickness of the sealing body 3 larger than the step side surface 17b, the joint portion (in the main joining step). It is possible to prevent a metal shortage in the plasticized region W1.

Further, in the second joining step, the step side surface 17b of the support column step portion 17 is inclined in a direction away from the hole wall 4a toward the tip end (so that the tip end of the support column 15 is tapered), so that the stirring pin is used. The contact between the F2 and the support column 15 can be easily avoided. Further, in the present embodiment, since the inclination angle γ of the step side surface 17b and the inclination angle α of the stirring pin F2 are the same (the step side surface 17b and the outer peripheral surface F10 of the stirring pin F2 are parallel), the stirring pin F2 The stirring pin F2 and the step side surface 17b can be brought as close as possible to each other while avoiding contact with the step side surface 17b.

Further, in this joining step, since only the stirring pin F2 is brought into contact with only the sealing body 3 to perform friction stir welding, the stirring pin F2 is formed on one side and the other side with respect to the rotation center axis Z of the stirring pin F2. It is possible to eliminate the imbalance of the material resistance received. As a result, the plastic fluid material is frictionally agitated in a well-balanced manner, so that a decrease in joint strength can be suppressed.

In the first butt portion J1, the flat surface F3 of the stirring pin F2 may be inserted deeper than the step bottom surface 17a. Thereby, the joint strength of the second butt portion J2 can be increased. Further, the plate thickness of the sealing body 3 may be set to be the same as the height dimension of the protruding portion 16.

1 Liquid-cooled jacket 2 Jacket body 3 Sealing body (member)
3a Front surface 3b Back surface 3c Outer peripheral side surface 10 Bottom 11 Peripheral wall 12 Peripheral wall step 12a Step bottom 12b Step side 13 Recess 17 Support step 17a Step bottom 17b Step side F Rotating tool F2 Stirring pin J1 First butt W1 plasticization area L1 set movement route SP start position EP end position

Claims (14)

It is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The strut is formed of a first aluminum alloy, the member is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
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 for forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered.
By placing the member on the support column, the first butted portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the support step step portion is formed. The mounting process of forming the second butt portion by superimposing the bottom surface of the step and the back surface of the member.
Only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is slightly brought into contact with the step side surface of the support column step portion, and the stirring pin is set along the set movement route set on the surface of the member. The joining step includes a main joining step of frictionally agitating the first butt portion while flowing the second aluminum alloy of the member into the gap when moving the rotary tool.
In the main joining step, the stirring pin that rotates from a set start position on the set movement route is inserted, and the stirring pin is gradually pushed in until it reaches a predetermined depth while moving in the traveling direction. Joining method to do. It is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The strut is formed of a first aluminum alloy, the member is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
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 for forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered.
By placing the member on the support column, the first butted portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the support step step portion is formed. The mounting process of forming the second butt portion by superimposing the bottom surface of the step and the back surface of the member.
Only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is slightly brought into contact with the step side surface of the support column step portion, and the stirring pin is set along the set movement route set on the surface of the member. The joining step includes a main joining step of frictionally agitating the first butt portion while flowing the second aluminum alloy of the member into the gap when moving the rotary tool.
In the main joining step, after the rotating stirring pin is inserted at a start position set on a side further away from the support column than the set movement route, the rotation center axis of the rotation tool overlaps with the set movement route. A joining method characterized in that the stirring pin is gradually pushed in until a predetermined depth is reached while moving to a position. It is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The strut is formed of a first aluminum alloy, the member is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
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 for forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered.
By placing the member on the support column, the first butted portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the support step step portion is formed. The mounting process of forming the second butt portion by superimposing the bottom surface of the step and the back surface of the member.
Only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is slightly brought into contact with the step side surface of the support column step portion, and the stirring pin is set along the set movement route set on the surface of the member. The joining step includes a main joining step of frictionally agitating the first butt portion while flowing the second aluminum alloy of the member into the gap when moving the rotary tool.
In the main joining step, an end position is set on the set movement route, friction stirring is performed on the first butt portion, and then the stirring pin is gradually pulled out while moving the rotation tool to the end position to complete the process. A joining method characterized in that the rotating tool is detached from the member at a position. It is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The strut is formed of a first aluminum alloy, the member is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
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 for forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered.
By placing the member on the support column, the first butted portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the support step step portion is formed. The mounting process of forming the second butt portion by superimposing the bottom surface of the step and the back surface of the member.
Only the rotating stirring pin is inserted into the member, and the outer peripheral surface of the stirring pin is slightly brought into contact with the step side surface of the support column step portion, and the stirring pin is set along the set movement route set on the surface of the member. The joining step includes a main joining step of frictionally agitating the first butt portion while flowing the second aluminum alloy of the member into the gap when moving the rotary tool.
In the main joining step, the end position is set on the side further away from the support column from the set movement route, and after frictional stirring with respect to the first butt portion, the stirring is performed while moving the rotation tool to the end position. A joining method comprising gradually pulling out a pin to separate the rotating tool from the member at the end position. In the main joining step, the rotating tool is moved along the second butt portion to perform frictional stirring in a state where the stirring pin is slightly in contact with the step bottom surface of the support column step portion. The joining method according to any one of claims 1 to 4. The method according to any one of claims 1 to 5, wherein in the preparatory step, the thickness of the member is further set to be larger than the height dimension of the step side surface of the support column step portion. Joining method. The joining method according to any one of claims 1 to 6, wherein the traveling direction and the rotating direction of the rotating tool are set so that the advancing side of the rotating tool is the support column side. It is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The strut is made of copper or a copper alloy, and the member is made of aluminum or an aluminum alloy.
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 for forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered.
By placing the member on the support column, the first butt portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the support column step is formed. A mounting step of forming a second butt portion by superimposing the step bottom surface of the portion and the back surface of the member.
The rotation tool is inserted along the set movement route set on the surface of the member in a state where only the rotating stirring pin is inserted into the member and the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the support column step portion. Includes a main joining step of frictionally agitating the first butt portion while allowing the aluminum or aluminum alloy of the member to flow into the gap when moving the member.
In the main joining step, the stirring pin that rotates from a set start position on the set movement route is inserted, and the stirring pin is gradually pushed in until it reaches a predetermined depth while moving in the traveling direction. Joining method to do. It is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The strut is made of copper or a copper alloy, and the member is made of aluminum or an aluminum alloy.
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 for forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered.
By placing the member on the support column, the first butt portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the support column step is formed. A mounting step of forming a second butt portion by superimposing the step bottom surface of the portion and the back surface of the member.
The rotation tool is inserted along the set movement route set on the surface of the member in a state where only the rotating stirring pin is inserted into the member and the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the support column step portion. Includes a main joining step of frictionally agitating the first butt portion while allowing the aluminum or aluminum alloy of the member to flow into the gap when moving the member.
In the main joining step, after the rotating stirring pin is inserted at a start position set on a side further away from the support column than the set movement route, the rotation center axis of the rotation tool overlaps with the set movement route. A joining method characterized in that the stirring pin is gradually pushed in until a predetermined depth is reached while moving to a position. It is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The strut is made of copper or a copper alloy, and the member is made of aluminum or an aluminum alloy.
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 for forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered.
By placing the member on the support column, the first butt portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the support column step is formed. A mounting step of forming a second butt portion by superimposing the step bottom surface of the portion and the back surface of the member.
The rotation tool is inserted along the set movement route set on the surface of the member in a state where only the rotating stirring pin is inserted into the member and the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the support column step portion. Includes a main joining step of frictionally agitating the first butt portion while allowing the aluminum or aluminum alloy of the member to flow into the gap when moving the member.
In the main joining step, an end position is set on the set movement route, friction stirring is performed on the first butt portion, and then the stirring pin is gradually pulled out while moving the rotation tool to the end position to complete the process. A joining method characterized in that the rotating tool is detached from the member at a position. It is a joining method in which a support column and a member having a hole into which the tip of the support column is inserted are joined by friction stir welding.
The strut is made of copper or a copper alloy, and the member is made of aluminum or an aluminum alloy.
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 for forming a strut step portion having a step bottom surface at the tip of the strut and a step side surface that rises diagonally from the step bottom surface so that the tip of the strut is tapered.
By placing the member on the support column, the first butt portion is formed so that there is a gap when the step side surface of the support column step portion and the hole wall of the hole portion are abutted, and the support column step is formed. A mounting step of forming a second butt portion by superimposing the step bottom surface of the portion and the back surface of the member.
The rotation tool is inserted along the set movement route set on the surface of the member in a state where only the rotating stirring pin is inserted into the member and the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the support column step portion. Includes a main joining step of frictionally agitating the first butt portion while allowing the aluminum or aluminum alloy of the member to flow into the gap when moving the member.
In the main joining step, the end position is set on the side further away from the support column from the set movement route, and after frictional stirring with respect to the first butt portion, the stirring is performed while moving the rotation tool to the end position. A joining method comprising gradually pulling out a pin to separate the rotating tool from the member at the end position. The method according to any one of claims 8 to 11, wherein in the preparatory step, the thickness of the member is set to be larger than the height dimension of the step side surface of the strut step portion. The joining method described. The joining method according to any one of claims 8 to 12, wherein the traveling direction and the rotating direction of the rotating tool are set so that the advancing side of the rotating tool is the support column side. 6. Joining method.

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