JP7003862B2 - How to manufacture a liquid-cooled jacket - Google Patents

Description

The present invention relates to a method for manufacturing a liquid-cooled jacket.

For example, Patent Document 1 discloses a method for manufacturing a liquid-cooled jacket. FIG. 17 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 axis C of the rotation tool F is overlapped with the butt portion J10 and relatively moved.

Japanese Patent Application Laid-Open 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 to each other. 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. 17, the stirring pin F2 becomes the sealing body 102. The material resistance received from the jacket body 101 side is larger than the material resistance received from the side. Therefore, it becomes difficult to stir different grades in a well-balanced manner by the stirring pin F2 of the rotary tool F, and there is a problem that a cavity defect is generated in the plasticized region after joining and the joining strength is lowered.

Further, when the stirring pin F2 is separated from the butt portion J10, the stirring pin F2 is pulled out in the vertical direction from a predetermined depth, 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 side, which causes a problem of contributing to poor joining.

From such a viewpoint, it is an object of the present invention to provide a method for manufacturing a liquid-cooled jacket capable of suitably joining aluminum alloys of different grades.

In order to solve the above problems, the present invention is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket body, and the jacket body. A method for manufacturing a liquid-cooled jacket in which a sealed body is joined by friction stir welding, wherein the jacket body is made of a first aluminum alloy and the sealed body 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 the stirring pin of the rotary tool used for friction stir is inclined so as to be tapered, and the inner peripheral edge of the peripheral wall portion is formed. In addition, a peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening is formed, and the plate thickness becomes larger than the height dimension of the step side surface of the peripheral wall step portion. In the preparatory step of forming the sealing body, and by placing the sealing body on the jacket body, the stepped side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted and first butt-butted. Only the mounting step of forming the portion and forming the second butt portion by superimposing the step bottom surface of the peripheral wall step portion and the back surface of the sealing body and the stirring pin of the rotating tool are sealed. Along the set movement route set inside the outer peripheral side surface of the sealed body in a state where the stirring pin is inserted into the stop and the outer peripheral surface of the stirring pin is slightly in contact with the step side surface of the peripheral wall step portion. The main joining step of circling around the sealing body at a predetermined depth and frictionally agitating the first butt portion is included, and in the main joining step, the end position is further inside the set movement route. After setting and friction stir welding to the first butt portion, the stirring pin is gradually raised while moving the rotation tool to the end position, and the rotation tool is separated from the sealing body at the end position. It is characterized by.

Further, the present invention is composed of a jacket main body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket main body, and the jacket main body and the sealing body are combined with each other. A method for manufacturing a liquid-cooled jacket to be joined by frictional stirring, wherein the jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is It 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 stirring is inclined so as to be tapered. A peripheral wall step portion having a step side surface rising from the step bottom surface toward the opening is formed, and the plate thickness of the sealing body is made larger than the height dimension of the step side surface of the peripheral wall step portion. In the preparatory step of forming the sealing body, and by placing the sealing body on the jacket body, the stepped side surface of the peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted against each other to form a first abutting portion. And the mounting step of superimposing the step bottom surface of the peripheral wall step portion and the back surface of the sealing body to form the second butt portion, and sealing only the stirring pin of the rotating tool. Predetermined along a set movement route set inside the outer peripheral side surface of the sealed body in a state where the stirring pin is inserted into the body and the outer peripheral surface of the stirring pin is slightly in contact with the step side surface of the peripheral wall step portion. In the main joining step, the end position is set on the set movement route, and the end position is set. After the friction stirring joint to the first butt portion, the rotating tool is gradually raised while moving the rotating tool to the end position, and the rotating tool is separated from the sealing body at the end position. ..

According to such a manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the first butt portion is sealed with the step side surface. It can be joined to the outer peripheral side surface of the body. Further, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the jacket body, it is possible to minimize the mixing of the first aluminum alloy from the jacket body to the sealing body. As a result, in the first butt portion, the second aluminum alloy on the sealed body side is mainly frictionally agitated, so that a decrease in bonding strength can be suppressed. In addition, since the rotation tool is gradually raised while moving toward the end position, it is possible to prevent the frictional heat from becoming excessive on the set movement route.

Further, the present invention is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket body, and the jacket body and the sealing body are formed. A method for manufacturing a liquid-cooled jacket to be joined by friction stir welding, wherein the jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is It 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 inclined so as to be tapered. A peripheral wall step portion having a step side surface rising from the step bottom surface toward the opening is formed, and the plate thickness of the sealing body is made larger than the height dimension of the step side surface of the peripheral wall step portion. In the preparatory step of forming the sealing body, and by placing the sealing body on the jacket body, the stepped side surface of the peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted against each other to form a first abutting portion. And the mounting step of superimposing the step bottom surface of the peripheral wall step portion and the back surface of the sealing body to form the second butt portion, and the stir welding pin of the rotating tool is sealed. A predetermined movement route is set to be inside the outer peripheral side surface of the sealed body in a state where the stirring pin is inserted into the body and the outer peripheral surface of the stirring pin is slightly in contact with the step side surface of the peripheral wall step portion. In the main joining step, the first region and the second region are included in the first butt portion. The first joining step of friction stir welding the first region after clamping the jacket body and the sealing body according to the second region, and the jacket body and the sealing body related to the first region. After clamping the aluminum, the second joining step of rubbing and stirring the second region is performed, and in the first joining step and the second joining step, the end position is further inside the set movement route. After setting and friction stir welding to the first butt portion, the stirring pin is gradually raised while moving the rotation tool to the end position, and the rotation tool is separated from the sealing body at the end position. It is characterized by.

Further, the present invention is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket body, and the jacket body and the sealing body are formed. A method for manufacturing a liquid-cooled jacket to be joined by friction stir welding, wherein the jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is It 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 inclined so as to be tapered. A peripheral wall step portion having a step side surface rising from the step bottom surface toward the opening is formed, and the plate thickness of the sealing body is made larger than the height dimension of the step side surface of the peripheral wall step portion. In the preparatory step of forming the sealing body, and by placing the sealing body on the jacket body, the stepped side surface of the peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted against each other to form a first abutting portion. And the mounting step of superimposing the step bottom surface of the peripheral wall step portion and the back surface of the sealing body to form the second butt portion, and the stir welding pin of the rotating tool is sealed. A predetermined movement route is set to be inside the outer peripheral side surface of the sealed body in a state where the stirring pin is inserted into the body and the outer peripheral surface of the stirring pin is slightly in contact with the step side surface of the peripheral wall step portion. In the main joining step, the first region and the second region are included in the first butt portion. The first joining step of friction stir welding the first region after clamping the jacket body and the sealing body according to the second region, and the jacket body and the sealing body related to the first region. After clamping the aluminum, the second joining step of rubbing and stirring the second region is performed, and in the first joining step and the second joining step, the end position is set on the set movement route. After the friction stir welding to the first butt portion, the rotating tool is gradually raised while moving the rotating tool to the end position, and the rotating tool is separated from the sealing body at the end position. do.

According to such a manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the first butt portion is sealed with the step side surface. It can be joined to the outer peripheral side surface of the body. Further, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the jacket body, it is possible to minimize the mixing of the first aluminum alloy from the jacket body to the sealing body. As a result, in the first butt portion, the second aluminum alloy on the sealed body side is mainly frictionally agitated, so that a decrease in bonding strength can be suppressed. In addition, since the rotation tool is gradually raised while moving toward the end position, it is possible to prevent the frictional heat from becoming excessive on the set movement route. Further, by separately performing the clamping position and the friction stir welding position of the jacket body and the sealing body in this joining step, the friction stir welding operation can be efficiently performed.

Further, it is preferable that the predetermined depth of the main joining step is set at a position where the stirring pin slightly contacts the bottom surface of the stepped portion of the peripheral wall.

According to such a manufacturing method, it is possible to increase the bonding strength of the second butt portion while preventing the first aluminum alloy from being mixed into the sealed body as much as possible.

Further, in the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform frictional stirring, and when the stirring pin is detached in the main joining step, the rotation speed is gradually increased from the predetermined rotation speed. It is preferable to move it to the end position while raising it.

According to such a manufacturing method, friction stir welding can be performed more preferably.

Further, in the preparatory step, a peripheral wall step portion having a step bottom surface and a step side surface that rises diagonally from the step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion. Is preferable.

According to such a manufacturing method, it is possible to reliably join the rotary tool while avoiding excessive contact between the rotary tool and the side surface of the step.

Further, it is preferable to form the sealing body so that the plate thickness is larger than the height dimension of the step side surface of the peripheral wall step portion.

According to such a manufacturing method, it is possible to make up for the metal shortage of the joint portion.

Further, in the preparation step, it is preferable to form the jacket body by die-casting and at least to form the sealed body so as to be convex toward the surface side.

According to such a manufacturing method, the liquid-cooled jacket can be flattened by utilizing the heat shrinkage caused by the frictional heat by making the jacket convex in advance.

Further, it is preferable to further include a temporary joining step of temporarily joining the first butt portion prior to the main joining step.

According to such a manufacturing method, it is possible to prevent the opening of the first butt portion in the main joining step.

According to the method for manufacturing a liquid-cooled jacket according to the present invention, aluminum alloys of different grades can be suitably joined.

It is an exploded perspective view which shows the liquid-cooled jacket which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the 1st region and the 2nd region of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the setting movement route of the liquid cooling jacket which concerns on 1st Embodiment. It is a top view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the 2nd joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment of this invention. It is a top view which shows the 2nd joining process of the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment. It is a top view which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment. It is a top view which shows after the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment. It is a top view which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 4th Embodiment. It is a top view which shows after the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 4th Embodiment. It is sectional drawing which shows the 1st modification of this invention. It is sectional drawing which shows the 2nd modification of this invention. It is sectional drawing which shows the manufacturing method of the conventional liquid-cooled jacket.

[First Embodiment]
An embodiment of the present invention will be described with reference to the drawings as appropriate. As shown in FIG. 1, the liquid-cooled jacket 1 according to the first embodiment is composed of a jacket body 2 and a sealing body 3. The liquid-cooled jacket 1 is a device that circulates a fluid inside to cool an arranged heating element. The jacket body 2 and the sealing body 3 are integrated by friction stir welding. In the following description, the "front surface" means the opposite surface of the "back surface".

The jacket body 2 is mainly composed of a bottom portion 10 and a peripheral wall portion 11. The jacket body 2 is not particularly limited as long as it is a metal capable of friction stir welding, but in the present embodiment, it is formed mainly containing a first aluminum alloy. As the first aluminum alloy, for example, an aluminum alloy cast material such as JISH5302 ADC12 (Al—Si—Cu system) is used.

The bottom portion 10 is a plate-shaped member having a rectangular shape. 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 recess 13 is formed in the bottom portion 10 and the peripheral wall portion 11. 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 that rises diagonally from the step bottom surface 12a. As shown in FIG. 2, the inclination angle β of the step side surface 12b may be appropriately set, but for example, in the present embodiment, it is the same as the inclination angle α of the stirring pin F2 of the rotation tool F shown in FIG. ..

The step side surface 12b may be perpendicular to the step bottom surface 12a. Further, although the jacket body 2 of the present embodiment is integrally formed, for example, the peripheral wall portion 11 may be divided and joined by a sealing member to be integrated.

The sealing body 3 is a member that seals the opening of the jacket body 2. The sealing body 3 is not particularly limited as long as it is a metal capable of friction stir welding, but in the present embodiment, it 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.

Next, a method for manufacturing the liquid-cooled jacket according to the present embodiment will be described. In the method for manufacturing a liquid-cooled jacket according to the present embodiment, a preparation step, a mounting step, and a main joining step are performed.

The preparation step is a step of preparing the jacket main body 2 and the sealing body 3. The jacket body 2 and the sealing body 3 are not particularly limited in terms of manufacturing method, but the jacket body 2 is molded by die casting, for example. The sealing body 3 is molded by, for example, extrusion molding.

As shown in FIG. 2, the mounting step is a step of mounting the sealing body 3 on the jacket main body 2. By the mounting step, the outer peripheral side surface 3c of the sealing body 3 and the step side surface 12b of the peripheral wall step portion 12 are abutted to form the first butt portion J1. Since the step side surface 12b is inclined outward, a gap having a V-shaped cross section is formed in the first butt portion J1. The first butt portion J1 is formed in a rectangular shape in a plan view along the periphery of the sealing body 3. Further, the step bottom surface 12a of the peripheral wall step portion 12 and the back surface 3b of the sealing body 3 are abutted to form the second butt portion J2. The plate thickness of the sealing body 3 may be appropriately set, but in the present embodiment, it is larger than the height dimension of the step side surface 12b.

As shown in FIG. 3, the region of the first butt portion J1 on one side (upper side in FIG. 3) of the intermediate line X1 set on the sealing body 3 is defined as the first region R1. Further, the region of the first butted portion J1 on the other side (lower side in FIG. 3) of the intermediate line X1 is referred to as the second region R2. The intermediate line X1 is a line segment at an intermediate position in the longitudinal direction of the sealing body 3.

As shown in FIG. 4, after the sealing body 3 is placed on the jacket main body 2, the jacket main body 2 and the sealing body 3 related to the second region R2 (see FIG. 3) are clamped immovably by the three clamps K1. .. Further, the "set movement route L1" (dashed-dotted line) is set inside the first butt portion J1. The set movement route L1 is a movement route of the rotation tool F necessary for joining the first butt portion J1 in the main joining step described later. As will be described later, in this embodiment, since the stirring pin F2 is slightly brought into contact with the step side surface 12b, the set movement route L1 is set in a rectangular shape in a plan view inside the outer peripheral side surface 3c.

As shown in FIGS. 5A and 6, this joining step is a step of friction stir welding the first butt portion J1 using the rotation tool F. In the present embodiment, the first main joining step of joining the first region R1 (see FIG. 3) of the first butt portion J1 and the second region R2 (see FIG. 3) of the first butt portion J1 are joined. The second main joining process and the above are performed respectively.

As shown in FIG. 6, the rotation tool F includes 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) to which a bolt is fastened 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. The tip of the stirring pin F2 is provided with a flat flat surface F3.

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, 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 toward 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 FIG. 5A, in the first main joining step, the intrusion section from the start position SP1 to the intermediate point S1, the main section from the intermediate point S1 to the intermediate point S2 on the set movement route L1, and the intermediate point S2. The three sections of the detachment section up to the end position EP1 are continuously frictionally agitated. The intermediate points S1 and S2 are set at positions where the intermediate line X1 and the set movement route L1 intersect. The start position SP1 is set at a position inside the set movement route L1 on the surface 3a of the sealing body 3. In the present embodiment, the angle between the line segment connecting the start position SP1 and the intermediate point S1 and the set movement route L1 in the first region R1 (see FIG. 3) is set to an obtuse angle.

In the closet section of the first main joining step, as shown in FIG. 5A, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP1 and moved to the intermediate point S1. At this time, as shown in FIG. 5B, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1. That is, instead of keeping the rotation tool F in one place, the rotation tool F is gradually lowered while being moved to the set movement route L1.

When the intermediate point S1 is reached, the friction stir welding in this section is started as it is. As shown in FIGS. 5A and 6, in this section, the rotation tool F is moved so that the rotation axis C of the stirring pin F2 and the set movement route L1 overlap. In this section, the “predetermined depth” of the stirring pin F2 is set so that the flat surface F3 of the stirring pin F2 slightly contacts the step bottom surface 12a. The "predetermined depth" of the stirring pin F2 may be appropriately set, and may be set at a position that does not reach the step bottom surface 12a, for example.

In this section of the first main joining step, as shown in FIG. 6, the set movement route L1 is set so that the outer peripheral surface of the stirring pin F2 slightly contacts the step side surface 12b. Here, the contact allowance of the outer peripheral surface of the stirring pin F2 with respect to the step side surface 12b is defined as the offset amount N. When the flat surface F3 of the stirring pin F2 is inserted deeper than the step bottom surface 12a of the peripheral wall step portion 12 and the outer peripheral surface of the stirring pin F2 is brought into contact with the step side surface 12b as in the present embodiment, the offset amount N Is set between 0 <N ≦ 1.0 mm, preferably between 0 <N ≦ 0.85 mm, and more preferably between 0 <N ≦ 0.65 mm.

If the outer peripheral surface of the stirring pin F2 is set so as not to come into contact with the step side surface 12b, the joint strength of the first butt portion J1 is lowered. Further, if the contact allowance N between the outer peripheral surface of the stirring pin F2 and the step side surface 12b exceeds 1.0 mm, a large amount of the first aluminum alloy of the jacket body 2 may be mixed into the sealing body 3 side, resulting in poor bonding. There is.

As shown in FIG. 7A, when the stirring pin F2 reaches the intermediate point S2, the stirring pin F2 shifts to the withdrawal section as it is. In the detachment section, as shown in FIG. 7B, the stirring pin F2 is gradually moved upward from the intermediate point S2 toward the ending position EP1, and the stirring pin F2 is detached from the sealing body 3 at the ending position EP1. Let me. That is, the rotation tool F is gradually raised while being moved to the end position EP1 without staying in one place. The end position EP1 is set at a position where the angle formed by the line segment connecting the end position EP1 and the intermediate point S2 and the set movement route L1 in the first region R1 (see FIG. 3) is an obtuse angle. A plasticized region W1 is formed in the movement locus of the rotation tool F.

When the first main joining process is completed, the clamp K1 is temporarily released, and as shown in FIG. 8, the jacket body 2 and the sealing body 3 related to the first region R1 (see FIG. 3) cannot be moved by the three clamps K1. Clamp to.

The second main joining step is a step of performing friction stir welding with the first butt portion J1 of the second region R2 (see FIG. 3). As shown in FIG. 8, in the second main joining step, the intrusion section from the start position SP2 to the intermediate point S2, the main section from the intermediate point S2 to the intermediate point S1 on the set movement route L1, and the intermediate point S1. The three sections of the detachment section up to the end position EP2 are continuously frictionally agitated. The start position SP2 is set at a position inside the set movement route L1 on the surface 3a of the sealing body 3. In the present embodiment, the angle between the line segment connecting the start position SP2 and the intermediate point S2 and the set movement route L1 in the second region R2 (see FIG. 3) is set to an obtuse angle.

In the closet section of the second main joining step, as shown in FIG. 8, friction stir welding is performed from the start position SP2 to the intermediate point S2. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP2 and moved to the intermediate point S2. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S2.

When the intermediate point S2 is reached, the friction stir welding in this section is started as it is. As shown in FIG. 8, in this section, the rotation tool F is moved so that the rotation axis C of the stirring pin F2 and the set movement route L1 overlap. In this section of the second main joining process, friction stir welding is performed in the same manner as in this section of the first main joining process.

When the stirring pin F2 reaches the intermediate point S1, the transition to the leaving section is performed as it is. In the detachment section, the stirring pin F2 is gradually moved upward from the intermediate point S1 toward the end position EP2, and the stirring pin F2 is detached from the sealing body 3 at the end position EP2. The end position EP2 is set at a position where the angle formed by the line segment connecting the end position EP2 and the intermediate point S1 and the set movement route L1 in the second region R2 (see FIG. 3) is an obtuse angle. A plasticized region W2 is formed in the movement locus of the rotation tool F.

According to the method for manufacturing a liquid-cooled jacket in 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 3 and the stirring pin F2. The step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be joined at the first butt portion J1. Further, since the outer peripheral surface of the stirring pin F2 is kept slightly in contact with the stepped side surface 12b of the jacket body 2, it is possible to minimize the mixing of the first aluminum alloy from the jacket body 2 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 bonding strength can be suppressed. That is, in this joining step, the imbalance of the material resistance received by the stirring pin F2 on one side and the other side with respect to the rotation axis C of the stirring pin F2 can be minimized. 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. Further, by increasing the plate thickness of the sealing body 3, it is possible to prevent a metal shortage at the joint portion.

Further, in the closet section of the first main joining step and the second main joining step, the stirring pin F2 is moved to a predetermined depth while moving the rotation tool F from the start positions SP1 and SP2 to the position overlapping with the set movement route L1. By gradually pushing in, it is possible to prevent the rotation tool F from stopping on the set movement route L1 and causing the frictional heat to become excessive.
Similarly, in the departure section of the first main joining step and the second main joining step, the stirring pin F2 is gradually raised from a predetermined depth while moving the rotary tool F from the set movement route L1 to the end positions EP1 and EP2. It is possible to prevent the rotation tool F from stopping on the set movement route L1 and causing the frictional heat to become excessive.
As a result, it is possible to prevent the frictional heat from becoming excessive on the set movement route L1 and excessively mixing the first aluminum alloy from the jacket main body 2 to the sealing body 3 to cause a bonding failure.

Further, by performing friction stir welding with the stirring pin F2 slightly in contact with both the step side surface 12b and the step bottom surface 12a, the first butt portion J1 and the second butt portion J2 can be reliably joined. .. Further, in order to keep the step side surface 12b and the stirring pin F2 slightly in contact with each other and the step bottom surface 12a and the stirring pin F2 in slight contact, the first aluminum alloy is mixed from the jacket body 2 into the sealing body 3. Can be prevented as much as possible.

Further, in the main joining step, the positions of the start positions SP1 and SP2 may be appropriately set, but by setting the angle between the start positions SP1 and SP2 and the set movement route L1 to be obtuse, the intermediate point S1 , S2 smoothly shifts to this section without slowing down the moving speed of the rotation tool F. As a result, it is possible to prevent the frictional heat from becoming excessive due to the rotation tool F stopping or the moving speed decreasing on the set movement route L1.

Further, in the main joining step of the present embodiment, the rotation direction and the traveling direction of the rotation tool F may be appropriately set, but the jacket body 2 side of the plasticized region W1 formed in the movement locus of the rotation tool F is sheared. The rotation direction and the traveling direction of the rotation tool F were set so that the side of the sealing body 3 was the side and the side of the sealing body 3 was the flow side. By setting the jacket body 2 side to be the shear side, the stirring action by the stirring pin F2 around the first butt portion J1 is enhanced, and the temperature rise in the first butt portion J1 can be expected, and the first butt portion J1 The step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be more reliably joined.

The shear side (Advancing side) means the side where the relative speed of the outer circumference of the rotation tool with respect to the bonded portion 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 rotation tool. .. On the other hand, the flow side (Retreating side) refers to the side where the relative speed of the rotation tool with respect to the jointed portion becomes low due to the rotation of the rotation tool in the direction opposite to the moving direction of the rotation tool.

Further, the first aluminum alloy of the jacket body 2 is a material having a higher hardness than the second aluminum alloy of the sealing body 3. Thereby, the durability of the liquid-cooled jacket 1 can be enhanced. Further, it is preferable that the first aluminum alloy of the jacket body 2 is an aluminum alloy cast material and the second aluminum alloy of the sealing body 3 is an aluminum alloy wrought material. By using an Al—Si—Cu based aluminum alloy casting material such as JISH5302 ADC12 as the first aluminum alloy, the castability, strength, machinability and the like of the jacket body 2 can be improved. Further, by using, for example, JIS A1000 series or A6000 series as the second aluminum alloy, processability and thermal conductivity can be improved.

Further, when the set movement route L1 of the main joining process is a closed route as in the present embodiment, the rotation tool F and the clamp K1 interfere with each other when the main joining process is performed, which complicates the work. There is a problem of becoming. However, according to the present embodiment, the friction stir welding operation can be efficiently performed by separately performing the clamp position and the friction stir welding position in the first main joining step and the second main joining step.

Further, in the main joining step, since the entire circumference of the first butt portion J1 can be friction-stir welded in the first main joining step and the second main joining step, the airtightness and watertightness of the liquid-cooled jacket can be improved. Further, for example, at the end portion of the second joining step, the detaching step may be performed so that the rotation tool F completely passes through the intermediate point S1 and then heads toward the end position EP2. That is, by overlapping the ends of the plasticized region W1 formed by the first main joining step and the plasticized region W2 formed by the second main joining step, the airtightness and watertightness are further improved. Can be done.

Further, by setting the inclination angle α of the stirring pin F2 and the inclination angle β of the step side surface 12b to be the same (parallel), the stirring pin F2 is uniformly contacted over the entire height direction of the step side surface 12b. Can be done. This makes it possible to perform friction stir welding in a well-balanced manner.

Further, in this joining step, since the friction stir is performed with the base end side of the stirring pin F2 of the rotary tool F exposed, the load acting on the friction stir device can be reduced.

In this joining step, the rotation speed of the rotation tool F may be constant or variable. In the intrusion section of the first main joining step, if the rotation speed of the rotation tool F at the start position SP1 is V1 and the rotation speed of the rotation tool F between the intermediate points S1 and S2 is V2, V1> V2 may be satisfied. The rotation speed V2 is a preset constant rotation speed in the set movement route L1. That is, at the start position SP1, the rotation speed may be set high, and the rotation speed may be gradually reduced in the closet section to shift to the main section.

Further, assuming that the rotation speed of the rotation tool F between the intermediate points S1 and S2 is V2 and the rotation speed of the rotation tool F at the end position EP1 is V3 in the detachment section of the first main joining step, V3> V2. May be. That is, after shifting to the detachment section, the rotation tool F may be detached from the sealing body 3 while gradually increasing the rotation speed toward the end position EP1. By setting as described above when the rotary tool F is pushed into the sealing body 3 or separated from the sealing body 3, the small pushing pressure during the pushing step or the separating step can be supplemented by the rotational speed. Therefore, friction stir welding can be preferably performed. The fact that the rotation speed of the rotation tool F may be changed during the intrusion step or the release step is the same in the second joining step and other embodiments.

[Second Embodiment]
Next, a method for manufacturing a liquid-cooled jacket according to the second embodiment of the present invention will be described. In the second embodiment, as shown in FIG. 9, the positions of the start positions SP1 and SP2 and the end positions EP1 and EP2 in the main joining process are different from those of the first embodiment. In the second embodiment, the parts different from the first embodiment will be mainly described.

In the production of the liquid-cooled jacket according to the second embodiment, a preparation step, a mounting step, and a main joining step are performed. The preparation step and the placement step are the same as those in the first embodiment.

In the main joining step, the first main joining step of performing friction stir welding with respect to the first region R1 (see FIG. 3) of the first butt portion J1 and the second with respect to the second region R2 (see FIG. 3). Perform the main joining process. As shown in FIG. 9, in the first main joining step of the present embodiment, the start position SP1 is set on the second region R2 (see FIG. 3) side of the intermediate point S1 on the set movement route L1. Further, in the second joining step of the present embodiment, the end position EP1 is set on the second region R2 (see FIG. 3) side of the intermediate point S2 on the set movement route L1.

In the first main joining step, the intrusion section from the start position SP1 to the intermediate point S1, the main section from the intermediate point S1 to the intermediate point S2 on the set movement route L1, and the departure section from the intermediate point S2 to the end position EP1. The three sections of are continuously rubbed and agitated. The intermediate points S1 and S2 are set at positions where the intermediate line X1 and the set movement route L1 intersect.

In the closet section of the first main joining step, as shown in FIG. 9, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP1 and moved to the intermediate point S1. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1.

When the intermediate point S1 is reached, the friction stir welding in this section is started as it is. As shown in FIGS. 9 and 10, in this section, the rotation tool F is moved so that the rotation axis C of the stirring pin F2 and the set movement route L1 overlap. The contact allowance between the stirring pin F2 and the step side surface 12b and the insertion depth of the stirring pin F2 are the same as those in the first embodiment.

When the stirring pin F2 reaches the intermediate point S2, the process shifts to the departure section as it is. In the detachment section, the stirring pin F2 is gradually moved upward from the intermediate point S2 toward the ending position EP1, and the stirring pin F2 is moved from the sealing body 3 at the ending position EP1 set on the set movement route L1. To leave.

When the first main joining process is completed, the clamp K1 is temporarily released, and as shown in FIG. 10, the jacket body 2 and the sealing body 3 related to the first region R1 (see FIG. 3) cannot be moved by the three clamps K1. Clamp to.

The second main joining step is a step of performing friction stir welding with the first butt portion J1 of the second region R2 (see FIG. 3). As shown in FIG. 10, in the second main joining step, the intrusion section from the start position SP2 to the intermediate point S2, the main section from the intermediate point S2 to the intermediate point S1 on the set movement route L1, and the intermediate point S1. Friction stir is continuously performed in the three sections of the detachment section up to the end position EP2.

As shown in FIG. 10, in the second main joining step of the present embodiment, the start position SP2 is set on the set movement route L1 on the first region R1 (see FIG. 3) side of the intermediate point S2. Further, in the second joining step of the present embodiment, the end position EP2 is set on the first region R1 side of the intermediate point S1 on the set movement route L1. That is, both the start position SP2 and the end position EP2 are set on the plasticization region W1.

In the closet section of the second joining step, as shown in FIG. 10, friction stir welding is performed from the start position SP2 to the intermediate point S2. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP2 and moved to the intermediate point S2. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S2.

When the intermediate point S2 is reached, the friction stir welding in this section is started as it is. As shown in FIG. 10, in this section, the rotation tool F is moved so that the rotation axis C of the stirring pin F2 and the set movement route L1 overlap. In this section of the second main joining process, friction stir welding is performed in the same manner as in this section of the first main joining process.

When the stirring pin F2 reaches the intermediate point S1, the transition to the leaving section is performed as it is. In the detachment section, the stirring pin F2 is gradually moved upward from the intermediate point S1 toward the end position EP2, and the stirring pin F2 is detached from the sealing body 3 at the end position EP2.

The method for manufacturing the liquid-cooled jacket according to the second embodiment described above can also achieve substantially the same effect as that of the first embodiment. As in the second embodiment, the start positions SP1 and SP2 in this joining step may be set on the set movement route L1.

[Third Embodiment]
Next, a method for manufacturing a liquid-cooled jacket according to a third embodiment of the present invention will be described. As shown in FIGS. 11 and 12, the third embodiment is different from the above-described embodiment in that the main joining step is performed once instead of being divided into two times. In this embodiment, the differences from the first embodiment will be mainly described.

In the method for manufacturing a liquid-cooled jacket according to the present embodiment, a preparation step, a mounting step, and a main joining step are performed. The preparation step and the placement step are the same as those in the first embodiment. In this joining step, the rotation tool F rotated to the right is inserted into the start position SP3, and friction stir welding is performed with respect to the first butt portion J1.

As shown in FIGS. 11 and 12, in this joining step, the intrusion section from the start position SP1 to the intermediate point S1 and the reference point around the sealing body 3 from the intermediate point S1 on the set movement route L1. The main section up to S3 and the departure section from the reference point S3 to the end position EP3 are continuously frictionally stirred. The intermediate point S1 is set at a position where the intermediate line X1 and the set movement route L1 intersect. The reference point S3 is set on the set movement route L1 in the first region R1 (see FIG. 3).

The start position SP3 is set at a position inside the set movement route L1 on the surface 3a of the sealing body 3. In the present embodiment, the angle between the line segment connecting the start position SP3 and the intermediate point S1 and the set movement route L1 in the first region R1 (see FIG. 3) is set to an obtuse angle.

In the closet section of the first main joining step, as shown in FIG. 11, friction stir welding is performed from the start position SP3 to the intermediate point S1. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP3 and moved to the intermediate point S1. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1.

When the intermediate point S1 is reached, the friction stir welding in this section is started as it is. As shown in FIGS. 11 and 12, in this section, the rotation tool F is moved so that the rotation axis C of the stirring pin F2 and the set movement route L1 overlap. The contact allowance between the stirring pin F2 and the step side surface 12b and the insertion depth of the stirring pin F2 are the same as those in the first embodiment.

The rotation tool F is made to go around the sealing body 3, and when the stirring pin F2 passes through the intermediate point S1 and reaches the reference point S3, the rotation tool F shifts to the leaving section as it is. In the detachment section, the stirring pin F2 is gradually moved upward from the reference point S3 to the end position EP3, and the stirring pin F2 is detached from the sealing body 3 at the end position EP3.

The method for manufacturing the liquid-cooled jacket according to the third embodiment described above can also have substantially the same effect as that of the first embodiment. Further, according to the third embodiment, since friction stir welding can be performed in one step, work efficiency can be improved.

[Fourth Embodiment]
Next, a method for manufacturing a liquid-cooled jacket according to a fourth embodiment of the present invention will be described. As shown in FIGS. 13 and 14, the fourth embodiment is different from the second embodiment in that the main joining step is performed once instead of being divided into two times. In this embodiment, the differences from the second embodiment will be mainly described.

In the method for manufacturing a liquid-cooled jacket according to the present embodiment, a preparation step, a mounting step, and a main joining step are performed. The preparation step and the placement step are the same as those in the above-described embodiment. In this joining step, the rotation tool F rotated to the right is inserted into the start position SP4, and friction stir welding is performed with respect to the first butt portion J1.

As shown in FIG. 13, in the first main joining step of the present embodiment, the start position SP4 is set on the second region R2 (see FIG. 3) side of the intermediate point S1 on the set movement route L1. Further, the end position EP4 is set on the first region R1 (see FIG. 3) side of the intermediate point S1 on the set movement route L1.

As shown in FIG. 13, in this joining step, the intrusion section from the start position SP4 to the intermediate point S1 and the intermediate point S1 on the set movement route L1 go around the sealing body 3 to the reference point S3. This section and the three sections of the departure section from the reference point S3 to the end position EP4 are continuously rubbed and stirred. The reference point S3 is set on the second region R2 (see FIG. 3) side of the intermediate point S1 on the set movement route L1.

In the closet section of this joining step, as shown in FIG. 13, friction stir welding is performed from the start position SP4 to the intermediate point S1. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP4 and moved to the intermediate point S1. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1.

When the intermediate point S1 is reached, the friction stir welding in this section is started as it is. As shown in FIGS. 13 and 14, in this section, the rotation tool F is moved so that the rotation axis C of the stirring pin F2 and the set movement route L1 overlap. The contact allowance between the stirring pin F2 and the step side surface 12b and the insertion depth of the stirring pin F2 are the same as those in the second embodiment.

The rotation tool F is made to go around the sealing body 3, and when the stirring pin F2 passes through the intermediate point S1 and reaches the reference point S3, the rotation tool F shifts to the leaving section as it is. In the detachment section, the stirring pin F2 is gradually moved upward from the reference point S3 to the end position EP4, and the stirring pin F2 is detached from the sealing body 3 at the end position EP4.

Also in the method for manufacturing the liquid-cooled jacket according to the fourth embodiment described above, substantially the same effect as that of the second embodiment can be obtained. Further, according to the fourth embodiment, since friction stir welding can be performed in one step, work efficiency can be improved.

Although the embodiments of the present invention have been described above, the design can be appropriately changed within a range not contrary to the gist of the present invention. As shown in FIG. 15, the mounting step according to the first modification of the present invention differs from the above-described embodiment in that the step side surface 12b and the outer peripheral side surface 3c are brought into surface contact with each other and abutted against each other. In the modification, the outer peripheral side surface 3c of the sealing body 3 is formed so as to be inclined outward, and the outer peripheral side surface 3c and the step side surface 12b are abutted in the mounting step. Even in this way, the same effect as that of the above-described embodiment can be obtained. As in the modified example, the height dimension of the step side surface 12b and the plate thickness of the sealing body 3 are made the same, and the peripheral wall end surface 11a and the surface 3a of the sealing body 3 are flush with each other. May be good.

As shown in FIG. 16, in the mounting step according to the second modification of the present invention, the jacket body 2 is mounted in a state of being curved so that the surface 3a side of the sealing body 3 is convex. It is different from the embodiment described above. When frictional heat is generated by friction stir welding, the sealing body 3 may warp in a concave shape due to heat shrinkage. However, according to the modification, by preliminarily making the sealing body 3 convex toward the surface 3a, the liquid-cooled jacket can be flattened by utilizing heat shrinkage.
The jacket body 2 according to the second modification of the present invention has a frame-shaped seal portion 5 formed on a part of the peripheral wall portion 11. The jacket body 2 may be integrally formed by die-casting, or the frame-shaped portion and the plate-shaped portion may be joined and integrated by the seal portion 5 in this way.

Further, in the present embodiment, the friction stir welding is performed while clamping in two steps, but it may be performed once, or the friction stir welding may be performed in three or more steps while clamping. Further, before performing the main joining step, a temporary joining step of temporarily joining the jacket body 2 and the sealing body 3 may be performed. This makes it possible to prevent the jacket body 2 and the sealing body 3 from opening each other during the main joining process. In the temporary joining step, it may be performed by frictional stirring using a rotation tool for temporary joining, or by welding. Further, in the push-in step and the release step, the movement route may be set so that the movement locus of the rotation tool F draws a curve (for example, an arc) in a plan view. As a result, the transition from the insertion process to the main process or from the main process to the withdrawal process can be smoothly performed.

1 Liquid-cooled jacket 2 Jacket body 3 Encapsulant F Rotating tool F2 Stirring pin F3 Flat surface J1 First butt part J2 Second butt part W Plasticization area

Claims (12)

A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stir welding. It ’s a method of manufacturing a cold jacket.
The jacket body is made of a first aluminum alloy, the sealant 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 taper.
A preparatory step for forming a peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion.
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. And the mounting step of forming the second butt portion by superimposing the back surface of the sealing body and the back surface of the sealing body.
Only the stirring pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the sealing body is slightly in contact with the stepped side surface of the peripheral wall step portion. A main joining step of circling around the sealing body at a predetermined depth along a set movement route set inside and agitating the first butt portion by friction is included.
In the main joining step, the end position is set further inside the set movement route, and after friction stir welding with respect to the first butt portion, the stirring pin is gradually moved while moving the rotation tool to the end position. A method for manufacturing a liquid-cooled jacket, which comprises raising and detaching the rotating tool from the sealing body at the ending position. A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stir welding. It ’s a method of manufacturing a cold jacket.
The jacket body is made of a first aluminum alloy, the sealant 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 taper.
A preparatory step for forming a peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion.
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. And the mounting step of forming the second butt portion by superimposing the back surface of the sealing body and the back surface of the sealing body.
Only the stirring pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the sealing body is slightly in contact with the stepped side surface of the peripheral wall step portion. A main joining step of circling around the sealing body at a predetermined depth along a set movement route set inside and agitating the first butt portion by friction is included.
In the main joining step, a first region and a second region are set in the first butted portion, and the first region is set.
A first joining step of frictionally stirring the first region after clamping the jacket body and the sealing body according to the second region.
After clamping the jacket body and the sealing body according to the first region, a second joining step of rubbing and stirring the second region is performed.
In the first main joining step and the second main joining step, the end position is set further inside than 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. A method for manufacturing a liquid-cooled jacket, characterized in that the stirring pin is gradually raised while being moved, and the rotating tool is separated from the sealing body at the end position. The liquid cooling according to claim 1 or 2, wherein the predetermined depth of the main joining step is set at a position where the stirring pin slightly contacts the bottom surface of the step of the peripheral wall step portion. How to make a jacket. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform frictional stirring.
One of claims 1 to 3, wherein when the stirring pin is detached in the main joining step, the stirring pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. The method for manufacturing a liquid-cooled jacket described in 1. A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stir welding. It ’s a method of manufacturing a cold jacket.
The jacket body is made of a first aluminum alloy, the sealant 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 taper.
A preparatory step for forming a peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion.
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. And the mounting step of forming the second butt portion by superimposing the back surface of the sealing body and the back surface of the sealing body.
Only the stirring pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the sealing body is slightly in contact with the stepped side surface of the peripheral wall step portion. A main joining step of circling around the sealing body at a predetermined depth along a set movement route set inside and agitating the first butt portion by friction is included.
In the main joining step, an end position is set on the set movement route, and after friction stir welding with respect to the first butt portion, the stirring pin is gradually raised while moving the rotation tool to the end position. A method for manufacturing a liquid-cooled jacket, which comprises removing the rotating tool from the sealing body at an end position. A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stir welding. It ’s a method of manufacturing a cold jacket.
The jacket body is made of a first aluminum alloy, the sealant 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 taper.
A preparatory step for forming a peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion.
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. And the mounting step of forming the second butt portion by superimposing the back surface of the sealing body and the back surface of the sealing body.
Only the stirring pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the sealing body is slightly in contact with the stepped side surface of the peripheral wall step portion. A main joining step of circling around the sealing body at a predetermined depth along a set movement route set inside and agitating the first butt portion by friction is included.
In the main joining step, a first region and a second region are set in the first butted portion, and the first region is set.
A first joining step of frictionally stirring the first region after clamping the jacket body and the sealing body according to the second region.
After clamping the jacket body and the sealing body according to the first region, a second joining step of rubbing and stirring the second region is performed.
In the first main joining step and the second main joining step, an 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. A method for manufacturing a liquid-cooled jacket, characterized in that the stirring pin is gradually raised to separate the rotary tool from the sealing body at the end position. The liquid cooling according to claim 5 or 6, wherein the predetermined depth of the main joining step is set at a position where the stirring pin slightly contacts the bottom surface of the step of the peripheral wall step portion. How to make a jacket. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform frictional stirring.
One of claims 5 to 7, wherein when the stirring pin is detached in the main joining step, the stirring pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. The method for manufacturing a liquid-cooled jacket described in 1. The preparatory step is characterized in that a peripheral wall step portion having a step bottom surface and a step side surface that rises diagonally from the step bottom surface toward the opening portion is formed on the inner peripheral edge of the peripheral wall portion. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 8. The liquid according to any one of claims 1 to 9, wherein the thickness of the sealed body is formed so as to be larger than the height dimension of the step side surface of the peripheral wall step portion. How to make a cold jacket. The method according to any one of claims 1 to 10, wherein in the preparation step, the jacket body is formed by die-casting and at least the sealed body is formed so as to be convex toward the surface side. How to make a liquid-cooled jacket. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 11, further comprising a temporary joining step of temporarily joining the first butt portion prior to the main joining step.

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