JP2020011271A - Liquid-cooled jacket manufacturing method - Google Patents

Abstract

To provide a liquid-cooled jacket manufacturing method in which aluminium alloys made of different materials can be preferably welded to each other.SOLUTION: The liquid-cooled jacket manufacturing method includes a welding step in which only a stirring pin F2 in rotation of a rotary tool F is inserted into a sealing body 3 and an outer peripheral surface of the stirring pin F2 is made to go around the sealing body 3 at a predetermined depth along a set movement route L1 set closer to inside than an outer peripheral side face 3c of the sealing body 3 in a state where an outer peripheral surface of the stirring pin F2 is made to slightly contact an uneven side face 12b of a peripheral wall uneven part, so as to friction-stir a first butted part J1. In the welding step, a finishing position is set closer to inside than the set movement route L1, the first butted part J1 is subjected to friction-stirring and welding, then the stirring pin F2 is gradually moved up while moving the rotary tool F to the finishing position and the rotary tool F is separated from the sealing body 3 at the finishing position.SELECTED DRAWING: Figure 6

Description

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

  For example, Patent Document 1 discloses a method for manufacturing a liquid cooling jacket. FIG. 17 is a cross-sectional view illustrating a method for manufacturing a conventional liquid cooling jacket. In the conventional liquid cooling jacket manufacturing method, a butt portion J10 formed by abutting a step side surface 101c provided at a step portion of a jacket body 101 made of an aluminum alloy with a side surface 102c of a sealing body 102 made of an aluminum alloy. Are subjected to friction stir welding. Further, in the conventional liquid cooling jacket manufacturing method, friction stir welding is performed by inserting only the stirring pin F2 of the rotary tool F into the butt portion J10. Further, in the conventional method of manufacturing a liquid cooling jacket, the rotation axis C of the rotary tool F is superimposed on the butting portion J10 and relatively moved.

JP-A-2013-131321

  Here, the jacket body 101 is likely to have a complicated shape. For example, the jacket body 101 is formed of a cast material of a 4000 series aluminum alloy, and a relatively simple shape such as the sealing body 102 is a wrought material of a 1000 series aluminum alloy. In some cases. As described above, there are cases where members of different types of aluminum alloy are joined to produce a liquid cooling jacket. In such a case, since the hardness of the jacket body 101 is generally higher than that of the sealing body 102, when friction stir welding is performed as shown in FIG. The material resistance received from the jacket body 101 side is larger than the material resistance received from the side. For this reason, it becomes difficult to stir different materials in a well-balanced manner by the stirring pin F2 of the rotating tool F, and there is a problem that a cavity defect is generated in the plasticized region after the joining and the joining strength is reduced.

  Further, when the stirring pin F2 is detached from the butt portion J10, the stirring pin F2 is pulled out from a predetermined depth in the vertical direction, so that the frictional heat at the end position of the friction 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 poor joining.

  From such a viewpoint, an object of the present invention is to provide a method of manufacturing a liquid cooling jacket that can suitably join aluminum alloys of different material types.

  In order to solve the problem, the present invention includes a jacket body having a bottom portion and a peripheral wall rising from a periphery of the bottom portion, and a sealing body that seals an opening of the jacket body. A method for manufacturing a liquid-cooled jacket that joins the sealing body with the friction stirrer, wherein the jacket main body is formed of a first aluminum alloy, and the sealing body 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 stirring is inclined so as to be tapered, and the inner peripheral edge of the peripheral wall portion is formed. A peripheral wall step having a step bottom surface and a step side surface rising from the step bottom toward the opening, and having a plate thickness of the peripheral wall step portion. A preparatory step of forming the sealing body so as to be larger than the height dimension of the difference side surface, and the step side surface of the peripheral wall step portion and the sealing body by placing the sealing body on the jacket body. Forming a first abutting portion by abutting the outer peripheral side surface of the sealing wall, and a mounting step of forming a second abutting portion by overlapping the step bottom surface of the peripheral wall step portion and the back surface of the sealing body; Inserting only the stirring pin of the rotating tool into the sealing body, with the outer peripheral surface of the stirring pin slightly in contact with the step side surface of the peripheral wall step portion, inside the outer peripheral side surface of the sealing body A main joining step of frictionally stirring the first butting portion by making a round around the sealing body at a predetermined depth along a set movement route set in the main joining step, Further inside than the travel route An end position is set, and after the friction stir welding to the first butting portion, the stirring pin is gradually raised while moving the rotating tool to the end position, and the rotating tool is removed from the sealing body at the end position. It is characterized by being detached.

  Further, the present invention includes a jacket body having a bottom portion and a peripheral wall portion rising from the periphery of the bottom portion, and a sealing body for sealing an opening of the jacket body, wherein the jacket body and the sealing body are A method for manufacturing a liquid cooling jacket joined by friction stirring, wherein the jacket body is formed of a first aluminum alloy, the sealing body is formed 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 an outer peripheral surface of a stirring pin of a rotary tool used for friction stirring is inclined so as to be tapered, and an inner peripheral edge of the peripheral wall portion, a step bottom surface, And a stepped side that rises from the stepped bottom toward the opening, and a peripheral wall stepped portion having a thickness of the sealing body is set at the stepped side of the peripheral wall stepped portion. A preparation step of forming the sealing body so as to be larger than a height dimension, and mounting the sealing body on the jacket main body to thereby form the step side surface of the peripheral wall step portion and an outer peripheral side surface of the sealing body. And a mounting step of forming a second butting portion by superimposing a step bottom surface of the peripheral wall step portion and a back surface of the sealing body to form a second butting portion, and Only the stirring pin is inserted into the sealing body, and the stirring pin is set inside the outer peripheral side surface of the sealing body in a state where the outer peripheral surface of the stirring pin slightly contacts the step side surface of the peripheral wall step portion. A main joining step in which the first butting portion is friction-stirred by making a round around the sealing body at a predetermined depth along the set moving route, and in the main joining step, Set the end position to After the friction stir welding to the first butting portion, the stirring tool is gradually raised while moving the rotating tool to the end position, and the rotating tool is detached from the sealing body at the end position. .

  According to this manufacturing method, the frictional heat between the sealing body and the stirring pin stirs the second aluminum alloy mainly on the sealing body side of the first butting part to be plastically fluidized, and seals the stepped side surface with the sealing at the first butting part. The outer peripheral side of the body can be joined. Further, since the outer peripheral surface of the stirring pin is only slightly in contact with the step side surface of the jacket main body, the mixing of the first aluminum alloy from the jacket main body into the sealing body can be minimized. Thereby, since the second aluminum alloy on the side of the sealing body is mainly friction-stirred in the first butting portion, it is possible to suppress a decrease in bonding strength. Further, since the rotating tool is gradually raised while moving toward the end position, it is possible to prevent friction heat from becoming excessive on the set movement route.

  Further, the present invention includes a jacket body having a bottom portion and a peripheral wall portion rising from the periphery of the bottom portion, and a sealing body for sealing an opening of the jacket body, wherein the jacket body and the sealing body are A method for manufacturing a liquid cooling jacket joined by friction stirring, wherein the jacket body is formed of a first aluminum alloy, the sealing body is formed 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 an outer peripheral surface of a stirring pin of a rotary tool used for friction stirring is inclined so as to be tapered, and an inner peripheral edge of the peripheral wall portion, a step bottom surface, And a stepped side that rises from the stepped bottom toward the opening, and a peripheral wall stepped portion having a thickness of the sealing body is set at the stepped side of the peripheral wall stepped portion. A preparation step of forming the sealing body so as to be larger than a height dimension, and mounting the sealing body on the jacket main body to thereby form the step side surface of the peripheral wall step portion and an outer peripheral side surface of the sealing body. And a mounting step of forming a second butting portion by superimposing a step bottom surface of the peripheral wall step portion and a back surface of the sealing body to form a second butting portion, and Only the stirring pin is inserted into the sealing body, and the stirring pin is set inside the outer peripheral side surface of the sealing body in a state where the outer peripheral surface of the stirring pin slightly contacts the step side surface of the peripheral wall step portion. A main joining step of making a round around the sealing body at a predetermined depth along the set moving route to friction stir the first butting section, wherein the main joining step includes Set the first area and the second area After clamping the jacket body and the sealing body according to the second area, a first main joining step of friction-stirring the first area, and after clamping the jacket body and the sealing body according to the first area Performing a second main joining step of friction-stirring the second region, and in the first main joining step and the second main joining step, setting an end position further inside than the set movement route, After the friction stir welding to the first butting portion, the stirring tool is gradually raised while moving the rotating tool to the end position, and the rotating tool is detached from the sealing body at the end position. .

  Further, the present invention includes a jacket body having a bottom portion and a peripheral wall portion rising from the periphery of the bottom portion, and a sealing body for sealing an opening of the jacket body, wherein the jacket body and the sealing body are A method for manufacturing a liquid cooling jacket joined by friction stirring, wherein the jacket body is formed of a first aluminum alloy, the sealing body is formed 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 an outer peripheral surface of a stirring pin of a rotary tool used for friction stirring is inclined so as to be tapered, and an inner peripheral edge of the peripheral wall portion, a step bottom surface, And a stepped side that rises from the stepped bottom toward the opening, and a peripheral wall stepped portion having a thickness of the sealing body is set at the stepped side of the peripheral wall stepped portion. A preparation step of forming the sealing body so as to be larger than a height dimension, and mounting the sealing body on the jacket main body to thereby form the step side surface of the peripheral wall step portion and an outer peripheral side surface of the sealing body. And a mounting step of forming a second butting portion by superimposing a step bottom surface of the peripheral wall step portion and a back surface of the sealing body to form a second butting portion, and Only the stirring pin is inserted into the sealing body, and the stirring pin is set inside the outer peripheral side surface of the sealing body in a state where the outer peripheral surface of the stirring pin slightly contacts the step side surface of the peripheral wall step portion. A main joining step of making a round around the sealing body at a predetermined depth along the set moving route to friction stir the first butting section, wherein the main joining step includes Set the first area and the second area After clamping the jacket body and the sealing body according to the second area, a first main joining step of friction-stirring the first area, and after clamping the jacket body and the sealing body according to the first area Performing a second main joining step of friction-stirring the second region, and setting an end position on the set movement route in the first main joining step and the second main joining step, After the friction stir welding to the part, the stirring tool is gradually raised while moving the rotating tool to the end position, and the rotating tool is detached from the sealing body at the end position.

  According to this manufacturing method, the frictional heat between the sealing body and the stirring pin stirs the second aluminum alloy mainly on the sealing body side of the first butting part to be plastically fluidized, and seals the stepped side surface with the sealing at the first butting part. The outer peripheral side of the body can be joined. Further, since the outer peripheral surface of the stirring pin is only slightly in contact with the step side surface of the jacket main body, the mixing of the first aluminum alloy from the jacket main body into the sealing body can be minimized. Thereby, since the second aluminum alloy on the side of the sealing body is mainly friction-stirred in the first butting portion, it is possible to suppress a decrease in bonding strength. Further, since the rotating tool is gradually raised while moving toward the end position, it is possible to prevent friction heat from becoming excessive on the set movement route. In addition, in the main joining step, by separately performing the position where the jacket body and the sealing body are clamped and the position where friction stirring is performed, friction stir operation can be performed efficiently.

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

  According to this manufacturing method, the joining strength of the second butted portion can be increased while preventing the first aluminum alloy from being mixed into the sealing body as much as possible.

  Further, in the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction 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 to the end position while raising.

  According to such a manufacturing method, friction stirring can be performed more suitably.

  In the preparing step, a peripheral wall step having a step bottom surface and a step side surface which rises obliquely so as to spread outward from the step bottom surface toward the opening portion is formed on an inner peripheral edge of the peripheral wall portion. Is preferred.

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

  Further, it is preferable that the thickness of the sealing body is formed to be larger than the height dimension of the step side surface of the peripheral wall step.

  According to such a manufacturing method, it is possible to compensate for the lack of metal at the joint.

  In the preparation step, it is preferable that the jacket body is formed by die-casting and that at least the sealing body is formed to be convex toward the front side.

  According to this manufacturing method, the liquid cooling jacket can be flattened by making it convex in advance and utilizing heat shrinkage caused by frictional heat.

  It is preferable that the method further includes a temporary joining step of temporarily joining the first butting portion before the main joining step.

  According to this manufacturing method, it is possible to prevent the opening of the first butted portion in the main joining step.

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

It is an exploded perspective view showing a liquid cooling jacket concerning a first embodiment of the present invention. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a top view showing the 1st field and the 2nd field of the liquid cooling jacket concerning a first embodiment. It is a top view showing the setting movement route of the liquid cooling jacket concerning a first embodiment. It is a top view showing the 1st main joining process of the manufacturing method of the liquid cooling jacket concerning a first embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a top view showing the 1st main joining process of the manufacturing method of the liquid cooling jacket concerning a first embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a top view showing the 2nd main joining process of the manufacturing method of the liquid cooling jacket concerning a first embodiment. It is a top view showing the 1st main joining process of the manufacturing method of the liquid cooling jacket concerning a second embodiment of the present invention. It is a top view showing the 2nd main joining process of the manufacturing method of the liquid cooling jacket concerning a second embodiment. It is a top view showing the main joining process of the manufacturing method of the liquid cooling jacket concerning a third embodiment. It is a top view showing after a main joining process of a manufacturing method of a liquid cooling jacket concerning a third embodiment. It is a top view showing the main joining process of the manufacturing method of the liquid cooling jacket concerning a fourth embodiment. It is a top view showing after a main joining process of a manufacturing method of a liquid cooling jacket concerning a fourth 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 cooling jacket.

[First embodiment]
An embodiment of the present invention will be described with reference to the drawings as appropriate. The liquid cooling jacket 1 according to the first embodiment includes a jacket body 2 and a sealing body 3 as shown in FIG. The liquid cooling jacket 1 is a device that circulates a fluid inside and cools the disposed heating element. The jacket body 2 and the sealing body 3 are integrated by friction stir welding. In the following description, “front surface” means a surface opposite to “back surface”.

  The jacket body 2 mainly includes a bottom portion 10 and a peripheral wall portion 11. The jacket main body 2 is not particularly limited as long as it is a metal that can be friction-stirred, but is mainly formed of a first aluminum alloy in the present embodiment. As the first aluminum alloy, for example, an aluminum alloy cast material such as JIS5302 ADC12 (Al-Si-Cu) is used.

  The bottom 10 is a rectangular plate-shaped member. The peripheral wall 11 is a wall that rises in a rectangular frame shape from the peripheral edge of the bottom 10. A concave portion 13 is formed in the bottom portion 10 and the peripheral wall portion 11. A peripheral wall step 12 is formed on the inner peripheral edge of the peripheral wall 11. The peripheral wall step portion 12 includes a step bottom surface 12a and a step side surface 12b rising obliquely from the step bottom surface 12a. As shown in FIG. 2, the inclination angle β of the step side surface 12b may be set as appropriate. For example, in this embodiment, the inclination angle β is the same as the inclination angle α of the stirring pin F2 of the rotary tool F shown in FIG. .

  Note that the step side surface 12b may be perpendicular to the step bottom surface 12a. In addition, although the jacket main body 2 of the present embodiment is formed integrally, for example, the peripheral wall portion 11 may be divided and joined by a seal 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 that can be friction-stirred, but is mainly formed of a second aluminum alloy in the present embodiment. 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 or the like.

  Next, a method for manufacturing the liquid cooling jacket according to the present embodiment will be described. In the method for manufacturing a liquid cooling jacket according to the present embodiment, a preparation step, a placement step, and a main bonding step are performed.

  The preparation step is a step of preparing the jacket body 2 and the sealing body 3. Although the manufacturing method of the jacket body 2 and the sealing body 3 is not particularly limited, the jacket body 2 is formed by, for example, die casting. The sealing body 3 is formed by, for example, extrusion molding.

  The placing step is a step of placing the sealing body 3 on the jacket body 2 as shown in FIG. In 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 butted to form the first butting portion J1. Since the step side surface 12b is inclined outward, a gap having a V-shaped cross section is formed at the first butting portion J1. The first butting portion J1 is formed in a rectangular shape in plan view along the periphery of the sealing body 3. Also, the step bottom surface 12a of the peripheral wall step portion 12 and the back surface 3b of the sealing body 3 abut against each other to form a second butting portion J2. The plate thickness of the sealing body 3 may be set as appropriate, but in the present embodiment, it is larger than the height dimension of the step side surface 12b.

  As shown in FIG. 3, a region on one side (upper side in FIG. 3) of the intermediate line X1 set on the sealing body 3 in the first butting portion J1 is defined as a first region R1. In addition, a region on the other side (lower side in FIG. 3) of the first line J1 from the intermediate line X1 is defined as a 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, when the sealing body 3 is placed on the jacket body 2, the jacket body 2 and the sealing body 3 relating to the second region R2 (see FIG. 3) are immovably clamped by the three clamps K1. . Further, a “set movement route L1” (dashed line) is set inside the first butting portion J1. The set movement route L1 is a movement route of the rotating tool F necessary for joining the first butting portion J1 in the main joining process described later. As will be described later, in this embodiment, since the stirring pin F2 is slightly in contact with the step side surface 12b, the set movement route L1 is set to a rectangular shape in a plan view inside the outer peripheral side surface 3c.

  The main joining step is a step of friction stir welding the first butting portion J1 using the rotary tool F as shown in FIGS. 5A and 6. In the present embodiment, the first main joining step of joining the first region R1 (see FIG. 3) of the first butting portion J1 and the second region R2 (see FIG. 3) of the first butting portion J1 are joined. And the second main bonding step is performed.

  As shown in FIG. 6, the rotating tool F includes a connecting portion F1 and a stirring pin F2. The rotating tool F is formed of, for example, tool steel. The connection part F1 is a part connected to a rotating shaft of a friction stirrer (not shown). The connecting portion F1 has a columnar shape, and has a screw hole (not shown) for fastening a bolt.

  The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 tapers as it moves away from the connecting portion F1. The tip of the stirring pin F2 has a flat flat surface F3.

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

  When rotating the rotating tool F counterclockwise, it is preferable that the spiral groove is formed 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 distal end. By setting the spiral groove in this way, the metal plastically fluidized at the time of friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thus, the amount of metal that overflows to the outside of the metal members to be joined (the jacket body 2 and the sealing body 3) can be reduced.

  As shown in FIG. 5A, in the first full joining step, the press-in 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 section S2 The three sections of the separation section up to the end position EP1 are continuously friction-stirred. 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 formed 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 at an obtuse angle.

  In the press-in section of the first main joining step, as shown in FIG. 5A, friction stirring from the start position SP1 to the intermediate point S1 is performed. In the press-in section, the stirring pin F2 rotated right 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 at least a "predetermined depth" set before reaching the intermediate point S1. That is, the rotating tool F is gradually lowered while moving to the set movement route L1 without keeping the rotating tool F in one place.

  When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section. As shown in FIGS. 5A and 6, in this section, the rotating 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 set as appropriate, and may be set, for example, at a position that does not reach the step bottom surface 12a.

  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 margin of the outer peripheral surface of the stirring pin F2 with 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 contacts the step side surface 12b as in this embodiment, the offset amount N is used. Is set between 0 <N ≦ 1.0 mm, preferably between 0 <N ≦ 0.85 mm, and more preferably between 0 <N ≦ 0.65 mm.

  When the outer peripheral surface of the stirring pin F2 is set so as not to contact the step side surface 12b, the joining strength of the first butting portion J1 is reduced. 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 connection. There is.

  As shown in FIG. 7A, when the stirring pin F2 reaches the intermediate point S2, the process directly proceeds to the separation section. In the separation section, as shown in FIG. 7B, the stirring pin F2 is gradually moved upward from the intermediate point S2 to the end position EP1, and the stirring pin F2 is separated from the sealing body 3 at the end position EP1. Let it. That is, the rotating tool F is gradually moved upward while moving to the end position EP1 without remaining at one place. The end position EP1 is set at a position where an angle formed by a 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 plasticizing region W1 is formed on the movement locus of the rotary tool F.

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

  The second main joining step is a step of performing friction stir welding on the first butting portion J1 of the second region R2 (see FIG. 3). As shown in FIG. 8, in the second final joining step, the press-in 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 section S1 The three sections of the separation section up to the end position EP2 are continuously friction-stirred. 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 this 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 at an obtuse angle.

  In the press-in section of the second main joining step, as shown in FIG. 8, friction stirring from the start position SP2 to the intermediate point S2 is performed. In the press-in section, the stirring pin F2 rotated right 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 predetermined "predetermined depth" at least until reaching the intermediate point S2.

  When the intermediate point S2 is reached, the process shifts to friction stir welding in this section. As shown in FIG. 8, in this section, the rotating 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 step, friction stirring is performed in the same manner as in the main section of the first main joining step.

  When the stirring pin F2 reaches the intermediate point S1, the process directly proceeds to the separation section. In the separation section, the stirring pin F2 is gradually moved upward from the intermediate point S1 to the end position EP2, and the stirring pin F2 is separated from the sealing body 3 at the end position EP2. The end position EP2 is set to 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 plasticizing region W2 is formed on the movement trajectory of the rotary tool F.

  According to the manufacturing method of the liquid cooling jacket in the present embodiment described above, the second aluminum alloy of the first butting portion J1 mainly on the side of the sealing body 3 is stirred by the frictional heat between the sealing body 3 and the stirring pin F2. As a result, the step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be joined at the first butting portion J1. Further, since the outer peripheral surface of the stirring pin F2 is only slightly contacted with the step side surface 12b of the jacket main body 2, the mixing of the first aluminum alloy from the jacket main body 2 into the sealing body 3 can be reduced as much as possible. Accordingly, in the first butting portion J1, the second aluminum alloy on the side of the sealing body 3 is mainly friction-stirred, so that a decrease in bonding strength can be suppressed. That is, in the main 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. Thereby, the plastic fluid material is friction-stirred in a well-balanced manner, so that a decrease in bonding strength can be suppressed. In addition, by increasing the plate thickness of the sealing body 3, it is possible to prevent a shortage of metal at the joint.

Further, in the press-in section of the first main joining step and the second main joining step, the stirring pin F2 is moved to the predetermined depth while moving the rotating tool F from the start positions SP1 and SP2 to a position overlapping 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 excessively increasing the frictional heat.
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 rotating tool F from the set movement route L1 to the end positions EP1 and EP2. By doing so, it is possible to prevent the rotating tool F from stopping on the set movement route L1 and excessively generating frictional heat.
As a result, it is possible to prevent the frictional heat from being excessively large on the set movement route L1, and preventing the first aluminum alloy from being excessively mixed from the jacket main body 2 into the sealing body 3 to cause a bonding failure.

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

  In addition, in the main joining step, the positions of the start positions SP1 and SP2 may be appropriately set. However, by setting the angle between the start positions SP1 and SP2 and the set movement route L1 to be an obtuse angle, the intermediate point S1 is set. , S2, the section moves smoothly to this section without lowering the moving speed of the rotary tool F. Accordingly, it is possible to prevent the frictional heat from being excessively increased due to the stop or the reduction of the moving speed of the rotating tool F on the set moving route L1.

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

  In addition, the shear side (Advancing side) means a side on which the relative speed of the outer periphery of the rotary tool to the part to be welded is a value obtained by adding the magnitude of the moving speed to the magnitude of the tangential speed on the outer periphery of the rotary tool. . On the other hand, the flow side (Retreating side) refers to a side where the relative speed of the rotating tool to the portion to be joined becomes low when the rotating tool rotates in the direction opposite to the moving direction of the rotating tool.

  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 cooling jacket 1 can be improved. Preferably, 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. The castability, strength, machinability and the like of the jacket main body 2 can be improved by using the first aluminum alloy as an Al-Si-Cu-based aluminum alloy cast material such as JIS5302 ADC12. In addition, by using the second aluminum alloy, for example, of JIS A1000 or A6000, workability and thermal conductivity can be improved.

  Further, when the set movement route L1 in the main joining process is a closed route as in the present embodiment, the rotating tool F and the clamp K1 interfere with each other when performing the main joining process, and the operation becomes complicated. Problem. However, according to the present embodiment, the friction stir operation can be performed efficiently by separately performing the position for clamping and the position for performing friction stir welding in the first main joining step and the second main joining step.

  Further, in the main joining step, the entire periphery of the first butting portion J1 can be friction stir welded in the first main joining step and the second main joining step, so that the air tightness and the water tightness of the liquid cooling jacket can be improved. Further, for example, at the end portion of the second main joining process, the detaching process may be performed such that the rotating tool F completely passes through the intermediate point S1 and then moves toward the end position EP2. That is, the airtightness and the watertightness are further improved by overlapping each end of the plasticized region W1 formed by the first main joining process and the plasticized region W2 formed by the second main joining process. Can be.

  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 can be uniformly contacted over the entire height of the step side surface 12b. Can be. Thereby, the friction stir welding can be performed in a well-balanced manner.

  Further, in the main joining step, the friction stir is performed while the base end side of the stirring pin F2 of the rotary tool F is exposed, so that the load acting on the friction stirrer can be reduced.

  In the main joining step, the rotation speed of the rotary tool F may be constant or may be variable. Assuming that the rotation speed of the rotary tool F at the start position SP1 is V1 and the rotation speed of the rotary tool F between the intermediate points S1 and S2 is V2 in the insertion section of the first main joining process, V1> V2 may be satisfied. The rotation speed V2 is a predetermined constant rotation speed on the set movement route L1. That is, at the start position SP1, the rotation speed may be set to be high, and the operation may be shifted to this section while gradually decreasing the rotation speed within the push-in section.

  Further, in the detachment section of the first main joining step, if the rotational speed of the rotary tool F between the intermediate points S1 and S2 is V2, and the rotational speed of the rotary tool F when detaching at the end position EP1 is V3, V3> V2 It may be. That is, after the transition to the detachment section, the rotating tool F may be detached from the sealing body 3 while gradually increasing the rotation speed toward the end position EP1. When the rotating tool F is pushed into the sealing body 3 or when the rotating tool F is separated from the sealing body 3, the small pressing force at the time of the pushing-in step or the separation step can be compensated by the rotation speed by setting as described above. Therefore, friction stirring can be suitably performed. The fact that the rotation speed of the rotary tool F may be varied at the time of the pushing-in step or the detaching step is the same in the second main joining step and other embodiments.

[Second embodiment]
Next, a method for manufacturing the liquid cooling 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, SP2 and the end positions EP1, EP2 in the main bonding step are different from those of the first embodiment. In the second embodiment, a description will be given focusing on portions different from the first embodiment.

  In the manufacture of the liquid cooling jacket according to the second embodiment, a preparation step, a placement step, and a main joining step are performed. The preparation step and the placement step are the same as in the first embodiment.

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

  In the first main joining step, a press-in section from the start position SP1 to the intermediate point S1, a main section from the intermediate point S1 to the intermediate point S2 on the set movement route L1, and a separation section from the intermediate point S2 to the end position EP1. Is continuously friction-stirred. The intermediate points S1 and S2 are set at positions where the intermediate line X1 and the set movement route L1 intersect.

  In the press-in section of the first main joining step, as shown in FIG. 9, friction stirring from the start position SP1 to the intermediate point S1 is performed. In the press-in section, the stirring pin F2 rotated right 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” at least until reaching the intermediate point S1.

  When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section. As shown in FIGS. 9 and 10, in this section, the rotating tool F is moved so that the rotation axis C of the stirring pin F2 and the set movement route L1 overlap. The contact margin 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 directly proceeds to the separation section. In the departure section, the stirring pin F2 is gradually moved upward from the intermediate point S2 to the end position EP1, and the stirring pin F2 is moved from the sealing body 3 to the end position EP1 set on the set movement route L1. Withdraw.

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

  The second main joining step is a step of performing friction stir welding on the first butting portion J1 of the second region R2 (see FIG. 3). As shown in FIG. 10, in the second final joining step, the press-in 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 section S1 Friction stirring is continuously performed in three sections of the separation section up to the end position EP2.

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

  In the press-in section of the second main joining step, as shown in FIG. 10, friction stirring from the start position SP2 to the intermediate point S2 is performed. In the press-in section, the stirring pin F2 rotated right 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 predetermined "predetermined depth" at least until reaching the intermediate point S2.

  When the intermediate point S2 is reached, the process shifts to friction stir welding in this section. As shown in FIG. 10, in this section, the rotating 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 step, friction stirring is performed in the same manner as in the main section of the first main joining step.

  When the stirring pin F2 reaches the intermediate point S1, the process directly proceeds to the separation section. In the separation section, the stirring pin F2 is gradually moved upward from the intermediate point S1 to the end position EP2, and the stirring pin F2 is separated from the sealing body 3 at the end position EP2.

  The liquid cooling jacket manufacturing method according to the second embodiment described above can also provide substantially the same effects as the first embodiment. As in the second embodiment, the start positions SP1 and SP2 in the main joining step may be set on the set movement route L1.

[Third embodiment]
Next, a method for manufacturing the liquid cooling jacket according to the third embodiment of the present invention will be described. The third embodiment is different from the above-described embodiment in that the main bonding step is performed once instead of being performed twice, as shown in FIGS. 11 and 12. In the present embodiment, a description will be given focusing on differences from the first embodiment.

  In the method for manufacturing a liquid cooling jacket according to the present embodiment, a preparation step, a placement step, and a main bonding step are performed. The preparation step and the placement step are the same as in the first embodiment. In the main joining step, the rotating tool F rotated right is inserted into the start position SP3, and friction stir welding is performed on the first butting portion J1.

  As shown in FIGS. 11 and 12, in the final joining step, a reference section is formed by making a round around the press-in section from the start position SP1 to the intermediate point S1 and around the sealing body 3 from the intermediate point S1 on the set movement route L1. The three sections of the main section up to S3 and the separation section from the reference point S3 to the end position EP3 are continuously friction-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 at an obtuse angle.

  In the press-in section of the first main joining step, as shown in FIG. 11, friction stirring from the start position SP3 to the intermediate point S1 is performed. In the pushing section, the stirring pin F2 rotated right 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” at least until reaching the intermediate point S1.

  When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section. As shown in FIGS. 11 and 12, in this section, the rotating tool F is moved so that the rotation axis C of the stirring pin F2 and the set movement route L1 overlap. The contact margin 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 rotating tool F is made to make a round around the sealing body 3, and when the stirring pin F2 reaches the reference point S3 after passing through the intermediate point S1, the process directly proceeds to the separation section. In the separation 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 separated from the sealing body 3 at the end position EP3.

  The liquid cooling jacket manufacturing method according to the third embodiment described above can also provide substantially the same effects as the first embodiment. Further, according to the third embodiment, the friction stir welding can be performed in one process, so that the working efficiency can be improved.

[Fourth embodiment]
Next, a method for manufacturing a liquid cooling jacket according to a fourth embodiment of the present invention will be described. The fourth embodiment differs from the above-described second embodiment in that the main bonding step is performed once instead of being performed twice, as shown in FIGS. 13 and 14. In the present embodiment, a description will be given focusing on differences from the second embodiment.

  In the method for manufacturing a liquid cooling jacket according to the present embodiment, a preparation step, a placement step, and a main bonding step are performed. The preparation step and the mounting step are the same as in the above-described embodiment. In the main joining step, the rotating tool F rotated right is inserted into the start position SP4, and friction stir welding is performed on the first butting 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 set movement route L1 on the side of the second region R2 (see FIG. 3) from the intermediate point S1. 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 the main joining step, the press-fitting section from the start position SP4 to the intermediate point S1 and the rotation from the intermediate point S1 on the set movement route L1 around the sealing body 3 to the reference point S3 are performed. This section and three sections of the separation section from the reference point S3 to the end position EP4 are continuously friction-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 press-in section of the main joining step, as shown in FIG. 13, friction stirring from the start position SP4 to the intermediate point S1 is performed. In the press-in section, the stirring pin F2 rotated right 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” at least until reaching the intermediate point S1.

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

  The rotating tool F is made to make a round around the sealing body 3, and when the stirring pin F2 reaches the reference point S3 after passing through the intermediate point S1, the process directly proceeds to the separation section. In the separation 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 separated from the sealing body 3 at the end position EP4.

  In the method for manufacturing the liquid cooling jacket according to the fourth embodiment described above, substantially the same effects as in the second embodiment can be obtained. Further, according to the fourth embodiment, the friction stir welding can be performed in one step, so that the working efficiency can be improved.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. As shown in FIG. 15, the mounting step according to the first modification of the present invention is different from the above-described embodiment in that the step side surface 12b and the outer peripheral side surface 3c are brought into surface contact and butted. In this modification, the outer peripheral side surface 3c of the sealing body 3 is formed 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 case, an effect equivalent to that of the above-described embodiment can be obtained. As in the modification, the peripheral wall end surface 11a and the surface 3a of the sealing body 3 are flush with each other so that the height dimension of the step side surface 12b and the plate thickness of the sealing body 3 are the same. Is also good.

As shown in FIG. 16, in the placement step according to the second modification of the present invention, the sealing body 3 is placed on the jacket body 2 in a state where the surface 3 a side is curved so as to be convex. This is different from the embodiment described above. When frictional heat is generated by friction stir welding, the sealing body 3 may be warped concavely due to thermal contraction. However, according to the modified example, the liquid cooling jacket can be flattened by utilizing the heat shrinkage by making the sealing body 3 convex to the surface 3a side in advance.
In the jacket body 2 according to the second modification of the present invention, a frame-shaped seal portion 5 is formed on a part of the peripheral wall portion 11. The jacket main body 2 may be integrally formed by die casting, or may be integrally formed by joining the frame-shaped portion and the plate-shaped portion with the seal portion 5 as described above.

  Further, in the present embodiment, the friction stir is performed while clamping is performed twice, but may be performed once or may be performed while clamping is performed three or more times. In addition, before performing the main bonding step, a temporary bonding step of temporarily bonding the jacket body 2 and the sealing body 3 may be performed. Thereby, the opening of the jacket main body 2 and the sealing body 3 at the time of the main joining step can be prevented. In the temporary joining step, the temporary joining may be performed by friction stirring using a rotary tool for temporary joining, or may be performed by welding. Further, in the pushing-in step and the separating step, the movement route may be set such that the movement trajectory of the rotary tool F draws a curve (for example, an arc) in plan view. Thereby, the transition from the insertion step to this step or from this step to the removal step can be smoothly performed.

DESCRIPTION OF SYMBOLS 1 Liquid-cooled jacket 2 Jacket main body 3 Sealing body F Rotating tool F2 Stirring pin F3 Flat surface J1 First butting part J2 Second butting part W Plasticization area

Claims (12)

A liquid comprising: a jacket body having a bottom portion and a peripheral wall rising from a periphery of the bottom portion; and a sealing body for sealing an opening of the jacket body, and joining the jacket body and the sealing body by friction stirring. A method of manufacturing a cold jacket,
The jacket body is formed of a first aluminum alloy, the sealing body is formed of a second aluminum alloy, and the first aluminum alloy is a material having a higher hardness than the second aluminum alloy,
The outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered,
A step of forming a peripheral wall step having an inner peripheral edge of the peripheral wall, a step bottom surface, and a step side surface rising from the step bottom toward the opening,
By mounting the sealing body on the jacket main body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body abut to form a first butting portion, and the step bottom surface of the peripheral wall step portion And a mounting step of forming a second butted portion by overlapping the back surface of the sealing body,
Inserting only the stirring pin of the rotating rotary tool into the sealing body, and making the outer peripheral surface of the stirring pin slightly contact the step side surface of the peripheral wall step portion; Main joining step of frictionally stirring the first butting portion by making a round around the sealing body at a predetermined depth along a set movement route set more inside,
In the main joining step, an end position is set further inside the set movement route, and after the friction stir welding to the first butting portion, the stirring pin is gradually moved while moving the rotating tool to the end position. A method for manufacturing a liquid cooling jacket, wherein the rotary tool is lifted and separated from the sealing body at the end position. A liquid comprising: a jacket body having a bottom portion and a peripheral wall rising from a periphery of the bottom portion; and a sealing body for sealing an opening of the jacket body, and joining the jacket body and the sealing body by friction stirring. A method of manufacturing a cold jacket,
The jacket body is formed of a first aluminum alloy, the sealing body is formed of a second aluminum alloy, and the first aluminum alloy is a material having a higher hardness than the second aluminum alloy,
The outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered,
A step of forming a peripheral wall step having an inner peripheral edge of the peripheral wall, a step bottom surface, and a step side surface rising from the step bottom toward the opening,
By mounting the sealing body on the jacket main body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body abut to form a first butting portion, and the step bottom surface of the peripheral wall step portion And a mounting step of forming a second butted portion by overlapping the back surface of the sealing body,
Inserting only the stirring pin of the rotating rotary tool into the sealing body, and making the outer peripheral surface of the stirring pin slightly contact the step side surface of the peripheral wall step portion; Main joining step of frictionally stirring the first butting portion by making a round around the sealing body at a predetermined depth along a set movement route set more inside,
In the main joining step, a first region and a second region are set in the first butting portion,
After clamping the jacket body and the sealing body according to the second area, a first main joining step of frictionally stirring the first area,
After clamping the jacket body and the sealing body according to the first region, performing a second main joining step of frictionally stirring the second region,
In the first main joining step and the second main joining step, an end position is set further inside than the set movement route, and after the friction stir welding to the first butting portion, the rotating tool is moved to the end position. A method for manufacturing a liquid cooling jacket, wherein the stirring tool is gradually raised while being moved, and the rotating tool is detached from the sealing body at the end position.   The liquid cooling according to claim 1 or 2, wherein the predetermined depth in the main joining step is set at a position where the stirring pin slightly contacts the step bottom surface of the peripheral wall step portion. How to make a jacket. In the main joining step, friction stirring is performed by rotating the stirring pin at a predetermined rotation speed,
4. The method according to claim 1, 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 more than the predetermined rotation speed. 5. 5. The method for producing a liquid-cooled jacket according to 1. A liquid comprising: a jacket body having a bottom portion and a peripheral wall rising from a periphery of the bottom portion; and a sealing body for sealing an opening of the jacket body, and joining the jacket body and the sealing body by friction stirring. A method of manufacturing a cold jacket,
The jacket body is formed of a first aluminum alloy, the sealing body is formed of a second aluminum alloy, and the first aluminum alloy is a material having a higher hardness than the second aluminum alloy,
The outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered,
A step of forming a peripheral wall step having an inner peripheral edge of the peripheral wall, a step bottom surface, and a step side surface rising from the step bottom toward the opening,
By mounting the sealing body on the jacket main body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body abut to form a first butting portion, and the step bottom surface of the peripheral wall step portion And a mounting step of forming a second butted portion by overlapping the back surface of the sealing body,
Inserting only the stirring pin of the rotating rotary tool into the sealing body, and making the outer peripheral surface of the stirring pin slightly contact the step side surface of the peripheral wall step portion; Main joining step of frictionally stirring the first butting portion by making a round around the sealing body at a predetermined depth along a set movement route set more inside,
In the main joining step, an end position is set on the set movement route, and after the friction stir welding to the first butting portion, the stirring pin is gradually raised while moving the rotating tool to the end position. A method for manufacturing a liquid cooling jacket, wherein the rotating tool is detached from the sealing body at an end position. A liquid comprising: a jacket body having a bottom portion and a peripheral wall rising from a periphery of the bottom portion; and a sealing body for sealing an opening of the jacket body, and joining the jacket body and the sealing body by friction stirring. A method of manufacturing a cold jacket,
The jacket body is formed of a first aluminum alloy, the sealing body is formed of a second aluminum alloy, and the first aluminum alloy is a material having a higher hardness than the second aluminum alloy,
The outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered,
A step of forming a peripheral wall step having an inner peripheral edge of the peripheral wall, a step bottom surface, and a step side surface rising from the step bottom toward the opening,
By mounting the sealing body on the jacket main body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body abut to form a first butting portion, and the step bottom surface of the peripheral wall step portion And a mounting step of forming a second butted portion by overlapping the back surface of the sealing body,
Inserting only the stirring pin of the rotating rotary tool into the sealing body, and making the outer peripheral surface of the stirring pin slightly contact the step side surface of the peripheral wall step portion; Main joining step of frictionally stirring the first butting portion by making a round around the sealing body at a predetermined depth along a set movement route set more inside,
In the main joining step, a first region and a second region are set in the first butting portion,
After clamping the jacket body and the sealing body according to the second area, a first main joining step of frictionally stirring the first area,
After clamping the jacket body and the sealing body according to the first region, performing a second main joining step of frictionally stirring the second region,
In the first main joining step and the second main joining step, an end position is set on the set movement route, and after the friction stir welding to the first butting portion, the rotating tool is moved to the end position. A method for manufacturing a liquid cooling jacket, comprising: gradually raising the stirring pin to release the rotating tool from the sealing body at the end position.   The liquid cooling according to claim 5 or 6, wherein the predetermined depth in the main joining step is set at a position where the stirring pin slightly contacts the step bottom surface of the peripheral wall step portion. How to make a jacket. In the main joining step, friction stirring is performed by rotating the stirring pin at a predetermined rotation speed,
8. The method according to claim 5, 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. 9. 5. The method for producing a liquid-cooled jacket according to 1.   In the preparing step, on the inner peripheral edge of the peripheral wall portion, a peripheral wall step portion having a step bottom surface and a step side surface rising obliquely so as to spread outward from the step bottom surface toward the opening is formed. The method for manufacturing a liquid cooling jacket according to any one of claims 1 to 8, wherein   The liquid according to any one of claims 1 to 9, wherein a plate thickness of the sealing body is formed to be larger than a height dimension of the step side surface of the peripheral wall step portion. Manufacturing method of cold jacket.   The said preparation process WHEREIN: The said jacket main body is formed by die-casting, and at least the said sealing body is formed so that it may become convex to the surface side, The claim 1 characterized by the above-mentioned. Manufacturing method of liquid cooling jacket.   The method of manufacturing a liquid cooling jacket according to any one of claims 1 to 11, further comprising a temporary joining step of temporarily joining the first butting portions before the main joining step.

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