JP2019136767A - Liquid-cooled jacket manufacturing method - Google Patents

Abstract

To provide a liquid-cooled jacket manufacturing method that can suitably join a jacket main body to a sealing body, using different kinds of aluminium alloy.SOLUTION: The liquid-cooled jacket manufacturing method includes: a placement step in which a sealing body 3 is placed on a jacket main body 2 and an end face 15a of a support pillar 15 is butted to a rear face 3b of the sealing body 3 to form a third butted part J3; and a second main joining step in which only a stirring pin F2 is inserted into the sealing body 3 and the third butted part J3 is subjected to friction stirring, with a protrusion part F4 of the stirring pin F2 contacted with the end face 15a of the support pillar 15.SELECTED DRAWING: Figure 7

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. 20 is a cross-sectional view showing a conventional method for manufacturing a liquid cooling jacket. In the conventional liquid cooling jacket manufacturing method, the end face 15a of the support column 15 rising on the bottom of the aluminum alloy jacket main body 2 and the back face 3b of the aluminum alloy sealing body 3 are brought into contact with each other at a butt J3. On the other hand, friction stir welding is performed.

JP 2006-087650 A

Here, the jacket body 2 is likely to have a complicated shape. For example, the jacket body 2 is formed of a cast material of 4000 series aluminum alloy, and a relatively simple shape such as the sealing body 3 is a stretched material of 1000 series aluminum alloy. There are cases where it is formed by. In this way, members having different aluminum alloy grades may be joined together to produce a liquid cooling jacket.
In such a case, since the jacket body 2 is generally harder than the sealing body 3, the stirring pin F2 of the rotary tool F is inserted into the support column 15 as shown in FIG. When the friction stir welding is performed on the butted portion J3, the material resistance received from the jacket body 2 side becomes larger than the material resistance that the stirring pin F2 receives from the sealing body 3 side. For this reason, it is difficult to stir different materials in a balanced manner by the stirring pin F2 of the rotary tool F, and there is a problem that a cavity defect occurs in the plasticized region after joining and the joining strength is lowered.

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

  In order to solve the above problems, the present invention includes a jacket body having a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a support column rising from the bottom portion, and a sealing body that seals an opening of the jacket body. A method of manufacturing a liquid cooling jacket in which the jacket body and the sealing body are joined by friction stirring, wherein the jacket body is made of a first aluminum alloy, and the sealing body is made of a second aluminum alloy. The first aluminum alloy is formed of a material whose hardness is higher than that of the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool is inclined so as to be tapered, and the tip of the stirring pin A flat surface is formed on the side, and the flat surface includes a protrusion projecting downward. A step bottom surface is formed on the inner peripheral edge of the peripheral wall portion, and the step bottom surface faces the opening. And a step side surface that rises diagonally so as to spread outward, a preparation step of forming a peripheral wall step portion, and the sealing body is mounted on the jacket body, and the step side surface of the peripheral wall step portion and the sealing A first abutting portion is formed by abutting the outer peripheral side surface of the body, a second abutting portion is formed by overlapping a step bottom surface of the peripheral wall step portion and a back surface of the sealing body, and an end surface of the column And a back surface of the sealing body to form a third butting portion, and only the rotating stirring pin is inserted into the sealing body, and the protruding portion of the stirring pin is connected to the end surface of the column. And a second main joining step in which friction agitation is performed on the third butted portion in a state in which the third abutting portion is brought into contact therewith.

According to this manufacturing method, since the protrusion of the stirring pin is kept in contact with the end face of the support column, the mixing of the first aluminum alloy from the jacket body to the sealing body can be minimized. Thereby, in the 3rd butt | matching part, since the 2nd aluminum alloy by the side of a sealing body is mainly frictionally stirred, the fall of joining strength can be suppressed.
In addition, the plastic fluid material that is frictionally stirred along the protrusions of the stirring pin and wound up on the protrusions is held by the flat surface of the stirring pin. Thereby, while being able to friction-stir around the protrusion part more reliably, the oxide film of a 3rd butt | matching part is parted reliably, Therefore The joining strength of a 3rd butt | matching part can be raised.

Further, in the second main joining step, it is preferable that friction stirring is performed on the third butted portion in a state where the flat surface of the stirring pin is not in contact with the end surface of the support column.
In this way, by reducing the amount of protrusions inserted into the struts, it is possible to further reduce the mixing of the first aluminum alloy from the jacket body into the sealing body, effectively suppressing the decrease in bonding strength. can do. In addition, since the width of the plasticized region can be reduced, it is possible to prevent the plastic fluid material from flowing out from the third abutting portion, and it is also possible to set the end face of the support column to be small.

Further, the method further includes a first main joining step in which the rotating tool is moved along the first abutting portion to perform friction stirring, and in the first main joining step, the outer peripheral surface of the stirring pin is only the sealing body. It is preferable to perform frictional stirring in a state where it is brought into contact with.
Thus, the strength of the liquid cooling jacket can be increased by joining the peripheral wall step portion and the sealing body. Moreover, since the outer peripheral surface of the stirring pin is brought into contact with only the sealing body, the mixing of the first aluminum alloy from the jacket body to the sealing body can be reduced.

Further, in the first main joining step, friction stir is performed by moving the rotary tool along the first abutting portion in a state where the protruding portion of the stirring pin is in contact with the step bottom surface of the peripheral wall step portion. Preferably it is done.
In the first main joining step, friction stirring is performed by moving the rotary tool along the first abutting portion in a state where the flat surface of the stirring pin is not in contact with the step bottom surface of the peripheral wall step portion. Is preferred.
If it does in this way, while being able to join a 2nd butt | matching part reliably, mixing of the 1st aluminum alloy from a jacket main body to a sealing body can be decreased as much as possible.

Further, it includes a first main joining step in which the rotating tool is moved along the first butting portion to perform friction stirring, and in the first main joining step, the outer peripheral surface of the stirring pin is attached to the sealing body. The friction stir is performed in a state where the jacket main body is brought into contact with the jacket main body.
In this way, the first abutting portion can be reliably joined, and the outer peripheral surface of the stirring pin is kept in slight contact with the jacket body, so that the first aluminum alloy is mixed from the jacket body into the sealing body. Can be reduced.

Further, in the first main joining step, friction stir is performed by moving the rotary tool along the first abutting portion in a state where the protruding portion of the stirring pin is in contact with the step bottom surface of the peripheral wall step portion. Preferably it is done.
Further, in the first main joining step, friction stirring is performed by moving the rotating tool along the first abutting portion in a state where the flat surface of the stirring pin is not in contact with the step bottom surface of the peripheral wall step portion. It is preferable.
If it does in this way, while being able to join a 2nd butt | matching part reliably, mixing of the 1st aluminum alloy from a jacket main body to a sealing body can be decreased as much as possible.

Further, in the first main joining step, it is preferable that the rotating tool is further rotated around the opening along the first butting portion to perform friction stirring.
Thus, the strength of the liquid cooling jacket can be further increased by reliably joining the peripheral wall step portion and the sealing body.

  In the preparation step, the jacket body may be formed by die casting, the bottom portion may be formed to be convex on the surface side, and the sealing body may be formed to be convex on the surface side. preferable.

  Although heat shrinkage occurs in the plasticized region due to heat input of friction stir welding, there is a risk of deformation so that the sealing body side of the liquid cooling jacket becomes concave. According to such a manufacturing method, the jacket body and the sealing body Can be made flat and the liquid cooling jacket can be flattened by utilizing heat shrinkage.

The deformation amount of the jacket body is measured in advance, and the insertion depth of the stirring pin of the rotary tool is adjusted in accordance with the deformation amount in the first main joining step and the second main joining step. It is preferable to perform friction stirring.
According to such a manufacturing method, even when the jacket main body and the sealing body are curved in a convex shape and the friction stir welding is performed, the length and width of the plasticized region formed in the liquid cooling jacket can be made constant. it can.

Moreover, it is preferable to include the temporary joining process which temporarily joins said 1st butting | matching part prior to said 1st main joining process.
According to this manufacturing method, it is possible to prevent the opening of each butted portion during the first main joining step by performing temporary joining.

Further, in the first main joining step and the second main joining step, a cooling plate through which a cooling medium flows is installed on the back side of the bottom portion, and the jacket main body and the sealing body are cooled by the cooling plate while friction is performed. It is preferable to perform stirring.
According to such a manufacturing method, since the frictional heat can be kept low, the deformation of the liquid cooling jacket due to heat shrinkage can be reduced.

  Moreover, it is preferable that the surface of the cooling plate and the back surface of the bottom portion are in surface contact. According to this manufacturing method, the cooling efficiency can be increased.

  Moreover, it is preferable that the said cooling plate has a cooling flow path through which the said cooling medium flows, and the said cooling flow path is provided with the planar shape which follows the movement locus | trajectory of the said rotation tool in a said 1st main joining process. According to this manufacturing method, the friction stir part can be intensively cooled, so that the cooling efficiency can be further increased.

  Moreover, it is preferable that the cooling flow path through which the cooling medium flows is constituted by a cooling pipe embedded in the cooling plate. According to this manufacturing method, the cooling medium can be easily managed.

  Further, in the first main joining step and the second main joining step, a cooling medium is allowed to flow through a hollow portion constituted by the jacket main body and the sealing body, and the jacket main body and the sealing body are cooled. It is preferable to perform friction stirring.

  According to such a manufacturing method, since the frictional heat can be kept low, the deformation of the liquid cooling jacket due to heat shrinkage can be reduced. Further, the jacket body itself can be used for cooling without using a cooling plate or the like.

  According to the manufacturing method of the liquid cooling jacket which concerns on this invention, the jacket main body and sealing body using the aluminum alloy from which a grade differs can be joined suitably.

It is a perspective view which shows the preparation process of the manufacturing method of the liquid cooling 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 cooling jacket which concerns on 1st embodiment of this invention. It is a perspective view which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment of this invention. 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 of this invention. It is sectional drawing which shows after the 1st main joining process of a manufacturing method to the liquid cooling jacket which concerns on 1st embodiment of this invention. It is a perspective view which shows the 2nd main joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment of this invention. It is sectional drawing which shows the 2nd main joining process of the manufacturing method of the liquid cooling 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 cooling jacket which concerns on the 1st modification of 1st embodiment of this invention. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid cooling jacket which concerns on the 2nd modification of 1st embodiment of this invention. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the 2nd main joining process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 3rd embodiment of this invention. It is sectional drawing which shows the 2nd main joining process of the manufacturing method of the liquid cooling jacket which concerns on 3rd embodiment of this invention. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 4th embodiment of this invention. It is a perspective view which shows the 3rd modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment of this invention. It is a figure which shows the 4th modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment of this invention, Comprising: It is a perspective view which shows a table. It is a figure which shows the 4th modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment of this invention, Comprising: It is a perspective view which shows the state which fixed the jacket main body and the sealing body to the table. It is a disassembled perspective view which shows the 5th modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment of this invention. It is a perspective view which shows the state which fixes the jacket main body and sealing body of the 5th modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment of this invention to a table. It is sectional drawing which shows the manufacturing method of the conventional liquid cooling jacket.

[First embodiment]
The manufacturing method of the liquid cooling jacket which concerns on 1st embodiment of this invention is demonstrated in detail with reference to drawings.
As shown in FIG. 1, the manufacturing method of the liquid cooling jacket according to the present embodiment manufactures the liquid cooling jacket 1 by friction stir welding the jacket main body 2 and the sealing body 3.
The liquid cooling jacket 1 is a member that installs a heating element (not shown) on the sealing body 3 and exchanges heat with the heating element by flowing a fluid therein.
In the following description, “front surface” means a surface opposite to the “back surface”.

The manufacturing method of the liquid cooling jacket which concerns on this embodiment performs a preparatory process, a mounting process, a 1st main joining process, and a 2nd main joining process. The preparation process is a process of preparing the jacket body 2 and the sealing body 3.
The jacket body 2 is mainly composed of a bottom portion 10, a peripheral wall portion 11, and a plurality of support columns 15. The jacket body 2 is formed mainly including a first aluminum alloy. As the first aluminum alloy, for example, an aluminum alloy casting material such as JISH5302 ADC12 (Al—Si—Cu system) is used.

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

  As shown in FIG. 1, the support column 15 stands vertically from the bottom 10. Although the number of the support | pillar 15 is not restrict | limited in particular, In this embodiment, four are formed. Moreover, although the shape of the support | pillar 15 is a column shape in this embodiment, another shape may be sufficient. The end surface 15 a of the support column 15 is formed at the same height as the step bottom surface 12 a of the peripheral wall step portion 12.

  The sealing body 3 is a plate-like member that seals the opening of the jacket body 2. The sealing body 3 is sized to be placed on the peripheral wall step portion 12. The plate thickness of the sealing body 3 is substantially equal to the height of the step side surface 12b. The sealing body 3 is formed mainly including 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 a wrought aluminum alloy material such as JIS A1050, A1100, A6063.

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 back surface 3b of the sealing body 3 is mounted on the step bottom surface 12a.
Thereby, the level | step difference side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are faced | matched, and the 1st butt | matching part J1 is formed. The first butting portion J1 is both a case where the step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are in surface contact and a case where the first butting portion J1 is abutted with a gap having a substantially V-shaped cross section as in this embodiment. May be included.
Further, the step bottom surface 12a and the back surface 3b of the sealing body 3 are abutted to form the second abutting portion J2. In the present embodiment, when the sealing body 3 is placed, the peripheral wall end surface 11a of the peripheral wall portion 11 and the surface 3a of the sealing body 3 are flush with each other.
Moreover, the back surface 3b of the sealing body 3 and the end surface 15a of the support | pillar 15 are faced | matched by the mounting process, and the 3rd butt | matching part J3 is formed.

As shown in FIG. 3, the first main joining step is a step of friction stir welding of the first butting portion J1 using the rotary tool F.
As shown in FIG. 4, the rotary tool F includes a connecting portion F <b> 1 and a stirring pin F <b> 2. The rotary tool F is made of, for example, tool steel. The connection part F1 is a part connected to the rotating shaft of a friction stirrer (not shown). The connecting portion F1 has a cylindrical shape, and is formed with a screw hole (not shown) in which a bolt is fastened.

The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 includes a flat surface F3 and a protrusion F4. The stirring pin F2 is tapered as it is separated from the connecting portion F1. A flat surface F3 that is perpendicular to the rotation center axis C and is flat is formed at the tip of the stirring pin F2.
The protruding portion F4 is a portion protruding downward from the central portion of the flat surface F3. The shape of the protrusion F4 is not particularly limited, but in the present embodiment, it is a columnar shape. A step portion is formed by the side surface of the protrusion F4 and the flat surface F3.

  That is, the outer surface of the stirring pin F2 is composed of a tapered outer peripheral surface F5, a flat surface F3 formed at the tip, and a protrusion F4 protruding downward from the center of the flat surface F3. When viewed from the side, the inclination angle α formed between the rotation center axis C and the outer peripheral surface F5 of the stirring pin F2 may be set as appropriate within a range of, for example, 5 ° to 30 °. It is set to be the same as the inclination angle β (see FIG. 2) of the 12 step side surfaces 12b.

  A spiral groove is formed on the outer peripheral surface F5 of the stirring pin F2. In the present embodiment, in order to rotate the rotary tool F to the right, the spiral groove is formed in a counterclockwise direction from the proximal end toward the distal end. In other words, the spiral groove is formed counterclockwise as viewed from above when the spiral groove is traced from the proximal end to the distal end.

  In addition, when rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove clockwise as it goes from the proximal end to the distal 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 proximal end to the distal end.

  By setting the spiral groove in this way, the metal plastically fluidized during friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the quantity of the metal which overflows to the exterior of a to-be-joined metal member (jacket main body 2 and sealing body 3) can be decreased.

  As shown in FIG. 3, when performing frictional stirring using the rotary tool F, only the stirring pin F2 rotated clockwise is inserted into the sealing body 3, and the sealing body 3 and the connecting portion F1 are separated from each other. Move. In other words, frictional stirring is performed with the base end portion of the stirring pin F2 exposed. A plasticized region W <b> 1 is formed on the movement locus of the rotary tool F by hardening the friction-stirred metal. In the present embodiment, the agitation pin F <b> 2 is inserted at the start position Sp set on the sealing body 3, and the rotary tool F is moved relative to the sealing body 3 clockwise.

As shown in FIG. 4, in the first main joining step, only the stirring pin F <b> 2 is inserted into the sealing body 3, and the protruding portion F <b> 4 is brought into contact with the step bottom surface 12 a of the peripheral wall step portion 12. In the present embodiment, the insertion depth of the stirring pin F2 is set so that the front end surface F6 of the protrusion F4 is inserted into the peripheral wall step portion 12 without the flat surface F3 of the stirring pin F2 contacting the step bottom surface 12a. ing.
In the first main joining step, the rotating tool F is moved around the opening in a state where the outer peripheral surface F5 and the flat surface F3 of the stirring pin F2 are not in contact with the jacket main body 2 and the protrusion F4 is in contact with the jacket main body 2. A round is made along the first butting portion J1.
Note that the state in which the outer peripheral surface F5 and the flat surface F3 of the stirring pin F2 are not in contact with the jacket body 2 means that the distance between the outer peripheral surface F5 of the stirring pin F2 and the step side surface 12b is zero, or the stirring pin F2 The case where the distance between the flat surface F3 and the step bottom surface 12a is zero can also be included.

  If the distance from the step side surface 12b to the outer peripheral surface F5 of the stirring pin F2 is too far, the bonding strength of the first butt portion J1 is lowered. The separation distance L from the step side surface 12b to the outer peripheral surface F5 of the stirring pin F2 may be set as appropriate depending on the materials of the jacket body 2 and the sealing body 3, but the outer peripheral surface F5 of the stirring pin F2 is stepped as in this embodiment. In the case where the side surface 12b is not contacted and the flat surface F3 is not contacted with the step bottom surface 12a, for example, 0 ≦ L ≦ 0.5 mm is set, and preferably 0 ≦ L ≦ 0.3 mm. .

When the rotating tool F makes one turn around the sealing body 3, the start end and the end of the plasticizing region W1 are overlapped. The rotary tool F may be gradually lifted and pulled out on the surface 3 a of the sealing body 3.
FIG. 5 is a cross-sectional view of the joint after the first main joining process according to the present embodiment. The plasticizing region W1 is formed on the sealing body 3 side with the first butting portion J1 as a boundary, and is formed so as to reach the jacket body 2 beyond the second butting portion J2.

As shown in FIG. 7, the second main joining process is a process of friction stir welding the third butted portion J3 using the rotary tool F.
In the second main joining step, as shown in FIG. 6, only the stirring pin F2 rotated clockwise is inserted into the start position Sp set on the surface 3a of the sealing body 3, and the sealing body 3 and the connecting portion F1 are separated from each other. Move while moving. In other words, frictional stirring is performed with the base end portion of the stirring pin F2 exposed. In the starting locus of the rotary tool F, a plasticized region W2 is formed by hardening the friction-stirred metal.

As shown in FIG. 7, in the second main joining step, the protrusion F <b> 4 of the stirring pin F <b> 2 is brought into contact with the end surface 15 a of the support column 15. In the present embodiment, the insertion depth is set so that the flat surface F3 of the stirring pin F2 does not contact the end surface 15a of the support column 15 and the lower portion of the protrusion F4 is inserted into the support column 15.
In the second main joining step, the flat surface F3 of the stirring pin F2 does not come into contact with the support column 15, and the rotation tool F is made to make a round along the third butting portion J3 in a state where only the protruding portion F4 is inserted into the support column 15. . More specifically, in the second main joining step, the inside of the rotary tool F is made to circulate along the outer edge of the third butted portion J3.
The state where the flat surface F3 of the stirring pin F2 is not in contact with the end surface 15a of the support column 15 may include a case where the distance between the flat surface F3 of the stirring pin F2 and the end surface 15a of the support column 15 is zero.

  When the rotating tool F makes one turn around the support column 15, the start end and the end end of the plasticizing region W2 are overlapped. The rotary tool F may be gradually lifted and pulled out on the surface 3 a of the sealing body 3. The plasticized region W2 is formed so as to reach the support column 15 beyond the third butted portion J3.

  According to the manufacturing method of the liquid cooling jacket according to the present embodiment described above, in order to keep the protrusion F4 of the stirring pin F2 in contact with the end surface 15a of the support column 15 in the second main joining step, the sealing is performed from the jacket body 2. Mixing of the first aluminum alloy into the stationary body 3 can be minimized. Thereby, in the 3rd butt | matching part J3, since the 2nd aluminum alloy by the side of the sealing body 3 is mainly frictionally stirred, the fall of joining strength can be suppressed.

  Further, the plastic fluid material that is frictionally stirred along the protrusion F4 of the stirring pin F2 and wound up on the protrusion F4 is pressed by the flat surface F3 of the stirring pin F2. Thereby, while being able to friction-stir more reliably around the protrusion part F4, since the oxide film of the 3rd butt | matching part J3 is cut | disconnected reliably, the joining strength of the 3rd butt | matching part J3 can be raised.

  Further, by inserting only the protrusion F4 of the stirring pin F2 deeper than the third abutting portion J3, compared with the case where the flat surface F3 of the stirring pin F2 is inserted deeper than the third abutting portion J3, the plasticizing region. The width of W2 can be reduced. Thereby, it is possible to prevent the plastic fluid material from flowing out from the third butted portion J3, and it is also possible to set the end surface 15a of the support column 15 to be small.

  Further, in the first main joining step, as shown in FIG. 4, the stirring pin F2 of the rotary tool F and the step side surface 12b of the peripheral wall step portion 12 are not in contact, but the sealing body 3 and the stirring pin F2 The second aluminum alloy mainly on the sealing body 3 side of the first butting portion J1 is stirred and plastically fluidized by the frictional heat, and the step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be joined. Thus, in the 1st butt | matching part J1, since the 2nd aluminum alloy by the side of the sealing body 3 is mainly friction-stirred, the fall of joining strength can be suppressed.

  Further, in the first main joining step, the step side surface 12b of the jacket body 2 is inclined outward, so that the contact between the stirring pin F2 and the jacket body 2 can be easily avoided. In this embodiment, the inclination angle β (see FIG. 2) of the step side surface 12b and the inclination angle α of the stirring pin F2 are the same (the step side surface 12b and the outer peripheral surface F5 of the stirring pin F2 are parallel). Therefore, it is possible to make the stirrer pin F2 and the stepped side surface 12b as close as possible while avoiding contact between the stirrer pin F2 and the stepped side surface 12b.

  Further, in the first main joining process, the rotation direction and the traveling direction of the rotary tool F may be set as appropriate, but the jacket body 2 side is the shear side in the plasticizing region W1 formed in the movement locus of the rotary tool F. 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 by the stirring pin F2 around the first butting portion J1 is increased, and a temperature increase 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 the side where the relative speed of the outer periphery of the rotating tool with respect to the joined portion is a value obtained by adding the moving speed to the size of the tangential speed on the outer periphery of the rotating tool. . On the other hand, the flow side (Retreating side) refers to the side on which the relative speed of the rotating tool with respect to the welded portion is reduced by rotating the rotating tool in the direction opposite to the moving direction of the rotating tool.

  Further, in the first main joining step, in order to keep the protruding portion F4 of the stirring pin F2 in contact with the step bottom surface 12a of the peripheral wall step portion 12, mixing of the first aluminum alloy from the jacket body 2 to the sealing body 3 is as much as possible. Can be reduced. Thereby, in the 2nd butt | matching part J2, since the 2nd aluminum alloy by the side of the sealing body 3 is mainly friction-stirred, the fall of joining strength can be suppressed.

  Further, the plastic fluid material that is frictionally stirred along the protrusion F4 of the stirring pin F2 and wound up on the protrusion F4 is pressed by the flat surface F3 of the stirring pin F2. Thereby, while being able to friction-stir around the protrusion part F4 more reliably, the oxide film of the 2nd butt | matching part J2 is parted reliably, Therefore The joining strength of the 2nd butt | matching part J2 can be raised.

  Further, by inserting only the protrusion F4 of the stirring pin F2 deeper than the second abutting portion J2, compared to the case where the flat surface F3 of the stirring pin F2 is inserted deeper than the second abutting portion J2, a plasticized region is obtained. The width of W1 can be reduced. Accordingly, it is possible to prevent the plastic fluid material from flowing out from the second butting portion J2, and it is also possible to set the step bottom surface 12a of the peripheral wall step portion 12 to be small.

  Further, the first aluminum alloy of the jacket body 2 is a material having higher hardness than the second aluminum alloy of the sealing body 3. Thereby, durability of the liquid cooling jacket 1 can be improved. The first aluminum alloy of the jacket body 2 is preferably an aluminum alloy cast material, and the second aluminum alloy of the sealing body 3 is preferably an aluminum alloy wrought material. For example, the castability, strength, machinability and the like of the jacket body 2 can be improved by using the first aluminum alloy as an Al—Si—Cu-based aluminum alloy casting material such as JISH5302 ADC12. Moreover, workability and heat conductivity can be improved by making a 2nd aluminum alloy into JIS A1000 type | system | group or A6000 type | system | group, for example.

  Note that either the first main bonding step or the second main bonding step may be performed first. Moreover, you may perform temporary joining to the 1st butt | matching part J1 by friction stirring or welding before performing a 1st main joining process. By performing a temporary joining process, the opening of each butt | matching part can be prevented in the case of a 1st main joining process and a 2nd main joining process.

[First modification]
Next, a first modification of the first embodiment will be described. As in the first modification shown in FIG. 8, the plate thickness of the sealing body 3 may be set to be larger than the height dimension of the step side surface 12 b of the peripheral wall step portion 12. Since the first butting portion J1 is formed so as to have a gap, there is a possibility that the joining portion may be short of metal, but the shortage of metal can be compensated by using the first modification.

[Second modification]
Next, a second modification of the first embodiment will be described. Like the 2nd modification shown in FIG. 9, you may incline the outer peripheral side surface 3c of the sealing body 3, and may provide an inclined surface. The outer peripheral side surface 3c is inclined outward as it goes from the back surface 3b to the front surface 3a. The inclination angle γ of the outer peripheral side surface 3c is the same as the inclination angle β of the step side surface 12b. Thereby, in a mounting process, the level | step difference side surface 12b and the outer peripheral side surface 3c of the sealing body 3 surface-contact. According to the second modified example, since no gap is generated in the first butting portion J1, a metal shortage at the joint portion can be compensated.

[Second Embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment of this invention is demonstrated. The manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment performs a preparatory process, a mounting process, a 1st main joining process, and a 2nd main joining process. In the second embodiment, the preparation process and the mounting process are the same as those in the first embodiment, and thus description thereof is omitted. Moreover, in 2nd embodiment, it demonstrates centering on the part which is different from 1st embodiment.

  In the first main joining process of the second embodiment, as shown in FIG. 10, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface F5 of the stirring pin F2 is brought into contact with the step side surface 12b. Instead, the flat surface F3 is brought into contact with the step bottom surface 12a, and the friction stir welding is performed in a state where the protrusion F4 is inserted into the peripheral wall step portion 12. If it does in this way, since the plastic fluid material by the side of the jacket main body 2 is pressed by the flat surface F3 of the stirring pin F2, the mixing of the 1st aluminum alloy from the jacket main body 2 to the sealing body 3 can be decreased more.

  In the second main joining process of the second embodiment, as shown in FIG. 11, when the stirring pin F2 is relatively moved along the third abutting portion J3, the flat surface F3 of the stirring pin F2 is moved to the end surface 15a of the support column 15. The friction stir welding is performed in a state where the protrusion F4 is inserted into the support column 15. If it does in this way, since the plastic fluid material by the side of the jacket main body 2 is pressed by the flat surface F3 of the stirring pin F2, the mixing of the 1st aluminum alloy from the jacket main body 2 to the sealing body 3 can be decreased more.

  In the first main joining step, the flat surface F3 of the stirring pin F2 is brought into contact with the step bottom surface 12a, and in the second main joining step, the flat surface F3 of the stirring pin F2 is not brought into contact with the end surface 15a of the support column 15. Good. In the first main joining step, the flat surface F3 of the stirring pin F2 is not brought into contact with the step bottom surface 12a. In the second main joining step, the flat surface F3 of the stirring pin F2 is brought into contact with the end surface 15a of the support column 15. Also good.

[Third embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on 3rd embodiment of this invention is demonstrated. The manufacturing method of the liquid cooling jacket which concerns on 3rd embodiment performs a preparatory process, a mounting process, a 1st main joining process, and a 2nd main joining process. In the third embodiment, the preparation process and the mounting process are the same as those in the first embodiment, and thus the description thereof is omitted. Further, in the third embodiment, a description will be given focusing on portions that are different from the first embodiment.

  In the first main joining step of the third embodiment, as shown in FIG. 12, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface F5 of the stirring pin F2 is brought into contact with the step side surface 12b. Without friction, the friction stir welding is performed in a state where the tip surface F6 of the protrusion F4 is in contact with the step bottom surface 12a. If it does in this way, mixing of the 1st aluminum alloy from the jacket main body 2 to the sealing body 3 can be decreased more.

  In the second main joining process of the third embodiment, as shown in FIG. 13, when the stirring pin F2 is relatively moved along the third abutting portion J3, the tip surface F6 of the protrusion F4 of the stirring pin F2 is used as a support column. Friction stir welding is performed in a state of contact with the 15 end faces 15a. If it does in this way, mixing of the 1st aluminum alloy from the jacket main body 2 to the sealing body 3 can be decreased more.

  In the first main joining step, the tip surface F6 of the protrusion F4 of the stirring pin F2 is brought into contact with the step bottom surface 12a, and in the second main joining step, the protrusion F4 of the stirring pin F2 is inserted into the support column 15. Good. Further, in the first main joining step, the protrusion F4 of the stirring pin F2 is inserted into the peripheral wall step portion 12, and in the second main joining step, the tip surface F6 of the protrusion F4 of the stirring pin F2 is connected to the end surface 15a of the support column 15. You may make it contact.

[Fourth embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on 4th embodiment of this invention is demonstrated. In the manufacturing method of the liquid cooling jacket which concerns on 4th embodiment, a preparatory process, a mounting process, a 1st main joining process, and a 2nd main joining process are performed. In 4th embodiment, since a preparation process, a mounting process, and a 2nd main joining process are equivalent to 1st embodiment, description is abbreviate | omitted. Further, in the fourth embodiment, description will be made centering on parts different from the first embodiment.

  As shown in FIG. 14, in the first main joining step according to the fourth embodiment, the friction stir welding may be performed by slightly contacting the outer peripheral surface F5 of the stirring pin F2 with the step side surface 12b of the peripheral wall step portion 12. . Here, the contact amount of the outer peripheral surface F5 of the stirring pin F2 with respect to the step side surface 12b is defined as an offset amount N. When the outer peripheral surface F5 of the stirring pin F2 is brought into contact with the step side surface 12b and the flat surface F3 of the stirring pin F2 is not brought into contact with the step bottom surface 12a as in the present embodiment, the offset amount N is set to 0 <N ≦ It is set between 0.5 mm, and preferably set between 0 <N ≦ 0.25 mm.

  In the first main joining step of the present embodiment, the outer peripheral surface F5 of the stirring pin F2 and the step side surface 12b are kept in slight contact, so that the first abutting portion J1 can be reliably joined and the jacket body 2 The mixing of the first aluminum alloy into the sealing body 3 can be reduced as much as possible.

  Further, in the first main joining step of the present embodiment, the step side surface 12b and the outer peripheral surface F5 of the stirring pin F2 are made parallel, so the contact allowance between the stirring pin F2 and the step side surface 12b extends in the height direction. It can be made uniform. Thereby, even when the outer peripheral surface F5 of the stirring pin F2 is slightly brought into contact with the step side surface 12b of the peripheral wall step portion 12, the plastic fluid material is stirred in a well-balanced manner, so that a decrease in strength of the joint portion can be suppressed. .

  Further, in the first main joining step of the present embodiment, by performing the friction stir welding in a state where the protrusion F4 is in contact with the step bottom surface 12a, the oxide film of the second butting portion J2 is surely divided, The joining strength of the second butting portion J2 can be increased. Further, as in the present embodiment, when the protrusion F4 is brought into contact with the step bottom surface 12a and the flat surface F3 is not brought into contact with the step bottom surface 12a, the first aluminum alloy from the jacket body 2 to the sealing body 3 is made. Mixing can be reduced as much as possible. In addition, since the width of the plasticized region W1 can be reduced as compared with the case where the flat surface F3 is inserted deeper than the step bottom surface 12a, the plastic fluidized material can be prevented from flowing out from the second abutting portion J2, and the step The width of the bottom surface 12a can be reduced.

[Third Modification of First Embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on the 3rd modification of 1st embodiment is demonstrated. As shown in FIG. 15, the third modification is different from the first embodiment in that a temporary joining step, a first main joining step, and a second main joining step are performed using a cooling plate. In the third modified example of the first embodiment, a description will be given centering on portions that are different from the first embodiment.

  In the third modification of the first embodiment, the jacket body 2 is fixed to the table K when performing the fixing process. The table K is configured by a substrate K1 having a rectangular parallelepiped shape, clamps K3 formed at four corners of the substrate K1, and a cooling pipe WP disposed inside the substrate K1. The table K is a member that restrains the jacket body 2 from being immovable and functions as a “cooling plate” in the claims.

  The cooling pipe WP is a tubular member embedded in the substrate K1. A cooling medium for cooling the substrate K1 flows in the cooling pipe WP. The arrangement position of the cooling pipe WP, that is, the shape of the cooling flow path through which the cooling medium flows is not particularly limited, but in the third modification example, the cooling pipe WP has a planar shape along the movement locus of the rotary tool F in the first main joining process. Yes. That is, the cooling pipe WP is disposed so that the cooling pipe WP and the first abutting portion J1 substantially overlap when viewed in plan.

  In the temporary joining step, the first main joining step, and the second main joining step of the third modified example, after the jacket body 2 is fixed to the table K, friction stir welding is performed while flowing a cooling medium through the cooling pipe WP. Thereby, since the frictional heat at the time of friction stirring can be restrained low, the deformation | transformation of the liquid cooling jacket 1 resulting from a thermal contraction can be made small. Further, in the third modified example, the cooling flow path and the first abutting portion J1 (the movement trajectory of the temporary joining rotary tool and the rotary tool F) overlap each other when viewed in a plan view. It is possible to intensively cool the part where the water is generated. Thereby, cooling efficiency can be improved. In addition, since the cooling pipe WP is provided to distribute the cooling medium, the management of the cooling medium becomes easy. Further, since the table K (cooling plate) and the jacket body 2 are in surface contact, the cooling efficiency can be increased.

  In addition, while cooling the jacket main body 2 and the sealing body 3 using the table K (cooling plate), the friction stir welding may be performed while flowing the cooling medium inside the jacket main body 2.

[Fourth Modification of First Embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on the 4th modification of 1st embodiment is demonstrated. As shown in FIG. 17, in the fourth modified example of the first embodiment, the first main joining step and the surface side of the jacket body 2 and the surface 3a of the sealing body 3 are curved so as to be convex. The second embodiment is different from the first embodiment in that the second main joining process is performed. The fourth modification will be described with a focus on the differences from the first embodiment.

  In the fourth modified example, a table KA is used as shown in FIG. The table KA includes a substrate KA1 having a rectangular parallelepiped shape, a spacer KA2 formed at the center of the substrate KA1, and clamps KA3 formed at four corners of the substrate KA1. The spacer KA2 may be integral with or separate from the substrate KA1.

In the fixing process of the fourth modified example, as shown in FIG. 17, the jacket body 2 and the sealing body 3 integrated by performing a temporary joining process are fixed to the table KA by the clamp KA3. The plasticized region W is formed by the temporary joining process.
When the jacket body 2 and the sealing body 3 are fixed to the table KA, the bottom portion 10 of the jacket body 2, the peripheral wall end surface 11a, and the surface 3a of the sealing body 3 are curved so as to be convex upward. More specifically, the first side 21 of the wall 11A of the jacket body 2, the second side 22 of the wall 11B, the third side 23 of the wall 11C, and the fourth side 24 of the wall 11D are curved. To bend.

  In the first main joining step and the second main joining step of the fourth modification, friction stir welding is performed using a rotary tool. In the first main joining step and the second main joining step, the deformation amount of at least one of the jacket body 2 and the sealing body 3 is measured, and the insertion depth of the stirring pin is adjusted according to the deformation amount. Friction stir welding is performed. In other words, the rotary tool is moved along the curved surfaces of the peripheral wall end surface 11a of the jacket main body 2 and the surface 3a of the sealing body 3 so that the movement trajectory becomes a curve. By doing in this way, the depth and width | variety of a plasticization area | region can be made constant.

Although heat shrinkage occurs in the plasticizing region due to heat input of the friction stir welding, there is a possibility that the sealing body 3 side of the liquid cooling jacket 1 may be deformed into a concave shape, but the first main joining step and the second of the fourth modification example. According to this joining process, since the jacket body 2 and the sealing body 3 are fixed in a convex shape in advance so that tensile stress acts on the peripheral wall end surface 11a and the surface 3a, heat shrinkage after friction stir welding is used. Thus, the liquid cooling jacket 1 can be flattened.
Further, when the main joining process is performed with a conventional rotating tool, if the jacket body 2 and the sealing body 3 are warped in a convex shape, the shoulder portion of the rotating tool comes into contact with the jacket body 2 and the sealing body 3, and the operability is improved. There is a problem that is bad. However, since the shoulder portion does not exist in the rotating tool of the fourth modified example, the operability of the rotating tool is improved even when the jacket body 2 and the sealing body 3 are warped in a convex shape.

  In addition, what is necessary is just to use a well-known height detection apparatus about the measurement of the deformation amount of the jacket main body 2 and the sealing body 3. FIG. Further, for example, by using a friction stirrer equipped with a detection device that detects the height from the table KA to at least one of the jacket body 2 and the sealing body 3, the jacket body 2 or the sealing body 3 is deformed. The first main joining step and the second main joining step may be performed while detecting the amount.

  Moreover, in the said 4th modification, although the jacket main body 2 and the sealing body 3 were curved so that all of the 1st edge part 21-the 4th edge part 24 might become a curve, it is not limited to this. For example, the first side 21 and the second side 22 may be curved so that the third side 23 and the fourth side 24 are curved. Further, for example, the first side 21 and the second side 22 may be curved, and the third side 23 and the fourth side 24 may be curved.

  In the fourth modification, the height position of the stirring pin is changed according to the amount of deformation of the jacket body 2 or the sealing body 3, but the main joining step is performed with the height of the stirring pin fixed to the table KA. May be.

  Further, the spacer KA2 may have any shape as long as it can be fixed so that the surface sides of the jacket body 2 and the sealing body 3 are convex. Further, the spacer KA2 may be omitted as long as the front surface side of the jacket body 2 and the sealing body 3 can be fixed in a convex shape. Further, the rotary tool may be attached to a robot arm having a rotation driving means such as a spindle unit at the tip, for example. According to such a configuration, the rotation center axis of the rotary tool can be easily changed to various angles.

[Fifth Modification of First Embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on the 5th modification of 1st embodiment is demonstrated. As shown in FIG. 18, in the fifth modification of the first embodiment, in the preparation step, the first embodiment is that the jacket body 2 and the sealing body 3 are formed so as to be curved in a convex shape on the surface side in advance. And different. In the fifth modified example of the first embodiment, a description will be given centering on parts different from the first embodiment.

  In the preparatory process according to the fifth modification of the first embodiment, the jacket body 2 and the sealing body 3 are formed by die casting so that the surface sides of the jacket body 2 and the sealing body 3 are curved in a convex shape. Thereby, the jacket main body 2 is formed so that the bottom portion 10 and the peripheral wall portion 11 are convex on the surface side. Moreover, it forms so that the surface 3a of the sealing body 3 may become convex shape.

  As shown in FIG. 19, in the fifth modified example, when the fixing process is performed, the temporarily bonded jacket body 2 and sealing body 3 are fixed to the table KB. The table KB is composed of a substrate KB1 having a rectangular parallelepiped shape, a spacer KB2 disposed in the center of the substrate KB1, clamps KB3 formed at four corners of the substrate KB1, and a cooling pipe WP embedded in the substrate KB1. Has been. The table KB is a member that restrains the jacket body 2 so as not to move and functions as a “cooling plate” in the claims.

  The spacer KB2 includes a curved surface KB2a that is curved so as to be convex upward, and rising surfaces KB2b and KB2b that are formed at both ends of the curved surface KB2a and rise from the substrate KB1. The first side Ka and the second side Kb of the spacer KB2 are curved, and the third side Kc and the fourth side Kd are straight lines.

  The cooling pipe WP is a tubular member embedded in the substrate KB1. A cooling medium for cooling the substrate KB1 flows in the cooling pipe WP. The arrangement position of the cooling pipe WP, that is, the shape of the cooling flow path through which the cooling medium flows is not particularly limited, but in the fifth modified example, it is a planar shape along the movement locus of the rotary tool in the first main joining process. . That is, the cooling pipe WP is disposed so that the cooling pipe WP and the first abutting portion J1 substantially overlap when viewed in plan.

  In the fixing step of the fifth modified example, the jacket body 2 and the sealing body 3 integrated by temporary joining are fixed to the table KB by the clamp KB3. More specifically, the jacket body 2 is fixed to the table KB so that the back surface of the bottom portion 10 is in surface contact with the curved surface KB2a. When the jacket main body 2 is fixed to the table KB, the first side 21 of the wall 11A of the jacket main body 2 and the second side 22 of the wall 11B become curved, and the third side 23 and the wall 11D of the wall 11C. The fourth side 24 is curved so as to be a straight line.

  In the first main joining step and the second main joining step of the fifth modification, friction stir welding is performed using a rotary tool. In the first main joining step and the second main joining step, the deformation amount of at least one of the jacket body 2 and the sealing body 3 is measured, and the insertion depth of the stirring pin is adjusted according to the deformation amount. Friction stir welding is performed. That is, it is moved along the peripheral wall end surface 11a of the jacket body 2 and the surface 3a of the sealing body 3 so that the movement locus of the rotary tool becomes a curve or a straight line. By doing in this way, the depth and width | variety of a plasticization area | region can be made constant.

  Although heat shrinkage occurs in the plasticized region due to heat input of the friction stir welding, there is a possibility that the sealing body 3 side of the liquid cooling jacket 1 is deformed into a concave shape, but the first main joining step and the second of the fifth modification example. According to this joining process, since the jacket main body 2 and the sealing body 3 are formed in a convex shape in advance, the liquid cooling jacket 1 can be flattened by utilizing the heat shrinkage after the friction stir welding.

  In the fifth modified example, the curved surface KB2a of the spacer KB2 is brought into surface contact with the concave back surface of the bottom 10 of the jacket body 2. Thereby, friction stir welding can be performed while cooling the jacket main body 2 and the sealing body 3 more effectively. Since the frictional heat in the friction stir welding can be kept low, the deformation of the liquid cooling jacket due to the heat shrinkage can be reduced. Thereby, in a preparatory process, when forming the jacket main body 2 and the sealing body 3 in convex shape, the curvature of the jacket main body 2 and the sealing body 3 can be made small.

  In addition, what is necessary is just to use a well-known height detection apparatus about the measurement of the deformation amount of the jacket main body 2 and the sealing body 3. FIG. Further, for example, by using a friction stirrer equipped with a detection device that detects the height from the table KB to at least one of the jacket body 2 and the sealing body 3, the jacket body 2 or the sealing body 3 is deformed. You may perform this joining process, detecting the quantity.

  Moreover, in the said 5th modification, although the jacket main body 2 and the sealing body 3 were curved so that the 1st edge part 21 and the 2nd edge part 22 might become a curve, it is not limited to this. For example, the spacer KB2 having a spherical surface may be formed, and the back surface of the bottom portion 10 of the jacket body 2 may be in surface contact with the spherical surface. In this case, when the jacket main body 2 is fixed to the table KB, all of the first side portion 21 to the fourth side portion 24 are curved.

  In the fifth modification, the height position of the stirring pin is changed according to the amount of deformation of the jacket main body 2 or the sealing body 3, but the height of the stirring pin with respect to the table KB is kept constant. May be.

DESCRIPTION OF SYMBOLS 1 Liquid cooling jacket 2 Jacket body 3 Sealing body 3a Front surface 3b Back surface 3c Outer peripheral side surface 10 Bottom portion 11 Peripheral wall portion 11a Peripheral wall end surface 12 Peripheral wall step portion 12a Step bottom surface 12b Step side surface 13 Recessed portion 15 Post 15a End surface F Rotating tool F2 Pin F3 Flat surface F4 Protruding part F5 Outer peripheral surface J1 First abutting part J2 Second abutting part J3 Third abutting part K Table (cooling plate)
W1 Plasticization region W2 Plasticization region WP Cooling pipe

Claims (17)

A jacket body having a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a support column rising from the bottom portion; and a sealing body that seals an opening of the jacket body, and the jacket body and the sealing body. A manufacturing method of a liquid cooling jacket to be joined by friction stirring,
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 is inclined so as to be tapered,
A flat surface is formed on the tip side of the stirring pin, and the flat surface includes a protrusion protruding downward,
A preparatory step of forming 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 on the inner peripheral edge of the peripheral wall portion;
The sealing body is placed 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 are abutted to form a first abutting portion, and the step bottom surface of the peripheral wall step portion and the step A mounting step of forming a second butting portion by overlapping the back surface of the sealing body, and further forming a third butting portion by butting the end surface of the support and the back surface of the sealing body;
Only the rotating stirring pin is inserted into the sealing body, and the second main joining is performed for friction stirring with respect to the third butting portion in a state where the protruding portion of the stirring pin is in contact with the end surface of the support column. And a process for producing a liquid cooling jacket.   2. The liquid cooling according to claim 1, wherein in the second main joining step, friction stirring is performed on the third abutting portion in a state where a flat surface of the stirring pin is not in contact with an end surface of the support column. The manufacturing method of a jacket. Furthermore, it includes a first main joining step in which the rotating tool is moved along the first butting portion and friction stirring is performed,
The liquid cooling jacket according to claim 1 or 2, wherein, in the first main joining step, friction stirring is performed in a state where an outer peripheral surface of the stirring pin is in contact with only the sealing body. Method.   In the first main joining step, friction stirring is performed by moving the rotary tool along the first butting portion in a state where the protruding portion of the stirring pin is in contact with the step bottom surface of the peripheral wall step portion. The manufacturing method of the liquid cooling jacket of Claim 3 characterized by these.   In the first main joining step, friction stirring is performed by moving the rotating tool along the first butting portion in a state where the flat surface of the stirring pin is not in contact with the step bottom surface of the peripheral wall step portion. The manufacturing method of the liquid cooling jacket of Claim 4. Furthermore, it includes a first main joining step in which the rotating tool is moved along the first butting portion and friction stirring is performed,
The friction stir is performed in a state where the outer peripheral surface of the stirring pin is brought into contact with the sealing body and slightly in contact with the jacket body in the first main joining step. Item 3. A method for producing a liquid cooling jacket according to Item 2.   In the first main joining step, friction stirring is performed by moving the rotary tool along the first butting portion in a state where the protruding portion of the stirring pin is in contact with the step bottom surface of the peripheral wall step portion. The manufacturing method of the liquid cooling jacket of Claim 6 characterized by these.   In the first main joining step, friction stirring is performed by moving the rotating tool along the first butting portion in a state where the flat surface of the stirring pin is not in contact with the step bottom surface of the peripheral wall step portion. The method for producing a liquid-cooled jacket according to claim 7.   9. The friction stir is performed in the first main joining step by further rotating the rotating tool around the opening along the first abutting portion. 10. The manufacturing method of the liquid cooling jacket as described in claim | item.   In the preparation step, the jacket body is formed by die casting, the bottom portion is formed to be convex on the surface side, and the sealing body is formed to be convex on the surface side. The manufacturing method of the liquid cooling jacket as described in any one of Claim 3 thru | or 9.   The amount of deformation of the jacket body is measured in advance, and in the first main joining step and the second main joining step, friction stirring is performed while adjusting the insertion depth of the stirring pin of the rotary tool according to the amount of deformation. The method for producing a liquid cooling jacket according to claim 10, wherein:   The method for manufacturing a liquid cooling jacket according to any one of claims 3 to 11, further comprising a temporary bonding step of temporarily bonding the first butted portion prior to the first main bonding step.   In the first main joining step and the second main joining step, a cooling plate through which a cooling medium flows is installed on the back side of the bottom portion, and friction stirring is performed while cooling the jacket body and the sealing body with the cooling plate. The method for manufacturing a liquid cooling jacket according to any one of claims 3 to 12, wherein the manufacturing method is performed.   The method for manufacturing a liquid cooling jacket according to claim 13, wherein the surface of the cooling plate and the back surface of the bottom portion are brought into surface contact. The cooling plate has a cooling channel through which the cooling medium flows,
The method for manufacturing a liquid cooling jacket according to claim 13 or 14, wherein the cooling flow path has a planar shape along a movement locus of the rotary tool in the first main joining step.   The method for manufacturing a liquid cooling jacket according to any one of claims 13 to 15, wherein the cooling channel through which the cooling medium flows is configured by a cooling pipe embedded in the cooling plate. .   In the first main joining step and the second main joining step, a cooling medium is caused to flow through a hollow portion constituted by the jacket main body and the sealing body, and friction stirring is performed while cooling the jacket main body and the sealing body. The method for manufacturing a liquid cooling jacket according to any one of claims 3 to 16, wherein:

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