JP2018051625A - Manufacturing method of liquid cooling jacket - Google Patents

Abstract

An object of the present invention is to provide a method for manufacturing a liquid cooling jacket capable of preventing metal shortage at a joint. A step of forming a jacket body 2 having a bottom portion and a peripheral wall portion 11 and forming a sealing body 3 for sealing an opening of the jacket body 2, a step side surface 13 b, and a sealing body 3 The sealing body arranging step of forming the abutting portion J1 by abutting the outer peripheral side surface, the auxiliary member arranging step of arranging the auxiliary member 4 along the abutting portion J1, and the rotating tool F around the abutting portion J1. The rotary tool F includes a stirring pin F2 longer than the thickness of the sealing body 3, and in the main joining process, the peripheral wall portion 11, the sealing body 3, and the auxiliary member 4 are included. Friction stir welding is performed on the abutting portion J1 in a state where only the stirring pin F2 is in contact therewith. [Selection] Figure 6

Description

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

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining metal members. Friction stir welding is a method in which the metal members are fixed together by rotating the rotary tool along the abutting portion between the metal members and plastically flowing the metal at the abutting portion by frictional heat between the rotating tool and the metal member. Phase joining is performed.

  In recent years, as the performance of electronic devices typified by personal computers has improved, the amount of heat generated by a mounted CPU (heating element) has increased, and cooling of the CPU has become important. Conventionally, air-cooled fan type heat sinks have been used to cool CPUs, but problems such as fan noise and cooling limit in air-cooled systems have come to be highlighted. The jacket is drawing attention.

Japanese Patent Laying-Open No. 2015-131321

  In the conventional friction stir welding method, only the stirring pin of the rotary tool is brought into contact with the jacket body and the sealing body, and the base end side of the stirring pin is exposed, so that the plastic fluid material overflows to the outside. As a result, there is a problem that the joint becomes insufficient in metal.

  Then, this invention makes it a subject to provide the manufacturing method of the liquid cooling jacket which can prevent the metal shortage of a junction part.

  In order to solve such a problem, the present invention is a method for manufacturing a liquid cooling jacket in which a jacket main body and a sealing body are friction stir joined to form a liquid cooling jacket, and rises from a bottom portion and a peripheral edge of the bottom portion. Forming a jacket body having a peripheral wall portion, a step bottom surface formed at a position one step down from an end surface of the peripheral wall portion, and a step side surface rising from the step bottom surface; and sealing the opening of the jacket main body A preparatory step of forming a sealing body, a sealing body arranging step of arranging the sealing body on the jacket main body, butting the step side surface and the outer peripheral side surface of the sealing body to form a butted portion; An auxiliary member arranging step of arranging an auxiliary member along the abutting portion, and a main joining step of performing a friction stir welding by making a round of the main welding rotary tool along the abutting portion, The rotating tool for joining includes a stirring pin longer than the thickness of the sealing body, and in the main joining step, only the stirring pin is in contact with the peripheral wall portion, the sealing body, and the auxiliary member. Friction stir welding is performed on the butt portion.

  According to this manufacturing method, in the main joining step, in addition to the peripheral wall portion and the sealing body, the auxiliary member also performs friction stir welding at the same time, so that a metal shortage at the joint portion can be prevented. Moreover, in this joining process, since only a stirring pin is made to contact a to-be-joined metal member, the load concerning a friction stirrer can be reduced.

  The main joining step preferably includes a removing step of setting joining conditions so that burrs are generated in the auxiliary member and removing the auxiliary member on which the burrs are formed.

  According to this manufacturing method, the burr can be easily removed together with the auxiliary member while the burr is concentrated on the auxiliary member.

Moreover, it is preferable to perform friction stir welding in the said main joining process in the state which inclined the rotation center axis | shaft of the said rotation tool for main joining to the inner side of the said jacket main body.
In the main joining step, it is preferable that the friction stir welding is performed in a state where the rotation center axis of the main welding rotating tool is inclined to the outside of the jacket body.

  According to this manufacturing method, the main rotating tool for joining can be easily inserted.

  Further, the method further includes a temporary bonding step of inserting a temporary tool for temporary bonding along the abutting portion and temporarily bonding the temporary tool. In the temporary bonding step, the peripheral wall portion, the sealing body, and the auxiliary member are used for the temporary bonding. It is preferable to perform spot temporary joining to the butt portion in a state where only the stirring pin of the rotary tool is in contact.

  According to such a manufacturing method, since the auxiliary member can be temporarily joined, when the friction stir welding is performed in the main joining step, the position shift of the auxiliary member can be prevented. Moreover, since spot temporary joining is performed, a joining cycle can be shortened compared with the case where it performs continuously. Moreover, since the amount of heat input can be suppressed by performing spot temporary joining, the thermal distortion of a sealing body can be prevented.

Further, in the temporary bonding step, it is preferable to perform spot temporary bonding in a state where the rotation center axis of the temporary bonding rotary tool is inclined to the inside of the jacket body.
Further, in the temporary bonding step, it is preferable to perform spot temporary bonding in a state where the rotation center axis of the temporary bonding rotary tool is inclined to the outside of the jacket body.

  According to this manufacturing method, the auxiliary member can be easily temporarily joined.

  Moreover, it is preferable that the rotary tool for temporary joining is the same as the rotary tool for main joining.

  According to such a manufacturing method, since it is not necessary to replace the rotating tool, the joining cycle can be shortened.

  According to the manufacturing method of the liquid cooling jacket which concerns on this invention, the metal shortage of a junction part can be prevented.

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 sealing body arrangement | positioning process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the auxiliary member arrangement | positioning process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the temporary joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the main joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the main joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the removal process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the removal process after the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the auxiliary member arrangement | positioning process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment. It is a perspective view which shows the main joining process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment. It is sectional drawing which shows the main joining process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment.

[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. In the following description, “front surface” means a surface opposite to the “back surface”. As shown in FIG. 1, in the method for manufacturing a liquid cooling jacket according to this embodiment, the jacket body 2 and the sealing body 3 are joined by friction stirring to form the liquid cooling jacket 1. The liquid cooling jacket 1 is an instrument that allows a fluid to circulate therein and exchanges heat with a heating element (not shown) installed in the liquid cooling jacket 1. In the manufacturing method of the liquid cooling jacket according to the present embodiment, a preparation process, a sealing body arranging process, an auxiliary member arranging process, a temporary joining process, a main joining process, and a removing process are performed.

  The preparation step is a step of preparing the jacket main body 2 and the sealing body 3. As shown in FIG. 1, the jacket main body 2 includes a bottom portion 10 and a peripheral wall portion 11. The jacket body 2 is a box-like body that is open at the top. The jacket body 2 is formed of an aluminum alloy in the present embodiment. The material of the jacket main body 2 is appropriately selected from metals capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. The bottom 10 has a plate shape that is rectangular in plan view. The peripheral wall portion 11 is erected on the periphery of the bottom portion 10 and has a rectangular frame shape in plan view. A recess 12 is formed in the bottom 10 and the peripheral wall 11.

  A step portion 13 is formed on the inner peripheral edge of the peripheral wall portion 11. The step portion 13 includes a step bottom surface 13a and a step side surface 13b rising from the step bottom surface 13a. The step bottom surface 13 a is formed at a position one step below the end surface 11 a of the peripheral wall portion 11. The jacket body 2 is formed by die casting, for example.

  As shown in FIG. 1, the sealing body 3 is a rectangular plate-like member that seals the opening of the jacket body 2. The sealing body 3 is sized to be disposed in the stepped portion 13 without a gap. The sealing body 3 is formed of the same metal member as the jacket body 2. The plate thickness dimension of the sealing body 3 is equivalent to the height dimension of the step side surface 13b.

  The sealing body arrangement | positioning process is a process of arrange | positioning the sealing body 3 in the jacket main body 2, and forming the butt | matching part J1, as shown in FIG. In the sealing body arranging step, the sealing body 3 is arranged on the step bottom surface 13 a of the peripheral wall portion 11. Thereby, the outer peripheral side surface 3d of the sealing body 3 and the step side surface 13b are abutted to form a butted portion J1. The butting portion J1 is formed over the circumferential direction of the sealing body 3.

  As shown in FIG. 3, the auxiliary member arranging step is a step of arranging the auxiliary member 4 along the abutting portion J1. The auxiliary member 4 is a plate-like member having a rectangular frame shape in plan view. The auxiliary member 4 may be made of a metal that can be frictionally stirred, but in the present embodiment, the auxiliary member 4 is made of the same material as the jacket body 2 and the sealing body 3. The plate width of the auxiliary member 4 is substantially the same as the width of the end surface 11 a of the peripheral wall portion 11. As a result, when the auxiliary member 4 is placed on the end surface 11a, the inner peripheral side surface 4d (see also FIG. 6) of the auxiliary member 4 overlaps the abutting portion J1. The plate thickness of the auxiliary member 4 may be appropriately set to such an extent that the plasticized region W2 does not run out of metal during a main joining process described later.

  In the present embodiment, the position of the inner peripheral side surface 4d of the auxiliary member 4 and the position of the abutting portion J1 are set to overlap, but the inner peripheral side surface 4d may be located inside the abutting portion J1. However, it may be located outside. The position of the inner peripheral side surface 4d of the auxiliary member 4 is such that the plasticizing region W2 does not run out of metal during the main joining process described later, and the auxiliary member 4 is positioned around the peripheral wall portion 11 when the removing process described later is performed. It is preferable to set it to such an extent that it does not remain in the surface.

  The auxiliary member 4 is formed with a slit 5 continuous in the width direction. Further, in the auxiliary member arranging step, the jacket body 2, the sealing body 3, and the auxiliary member 4 are restrained so as not to move on the table by a fixing jig such as a clamp.

  As shown in FIG. 4, the temporary bonding step is a step of temporarily bonding the sealing body 3 and the auxiliary member 4 using a rotary tool F (a temporary bonding rotary tool and a main bonding rotating tool). The rotary tool F includes a connecting portion F1 and a stirring pin F2. The rotary tool F is made of, for example, tool steel. The connecting part F1 is a part connected to the rotating shaft of the friction stirrer. The connecting part F1 has a cylindrical shape.

  The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. The length of the stirring pin F <b> 2 is larger than the plate thickness of the sealing body 3. A spiral groove is formed on the outer peripheral surface 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 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. 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 (the jacket main body 2, the sealing body 3, and the auxiliary member 4) can be decreased. The rotary tool F is preferably attached to a robot arm having a driving unit such as a spindle unit at the tip. In this way, the rotation center axis of the rotary tool F can be easily tilted.

  In the temporary joining step, the rotary tool F is pressed shallowly at a predetermined interval along the abutting portion J1, and the jacket body 2, the sealing body 3, and the auxiliary member 4 are spot-joined. In the temporary joining step, the rotary tool F may be inserted so that the rotation center axis of the rotary tool F is parallel to the vertical direction, but in this embodiment, the surface 3b of the sealing body 3 and the inner periphery of the auxiliary member 4 Spot spot joining is performed on the inner corner formed by the side surface 4d in a state where the rotation center axis of the rotary tool F is inclined to the inside of the jacket body 2. By the temporary joining process, the plasticized region W1 is formed in the inner corner (butting portion J1).

  As shown in FIGS. 5 and 6, the main joining step is a step of friction stir welding the butt joint J <b> 1 using the rotary tool F (rotary tool for temporary joining and rotary tool for main joining). In the main joining process, the rotating tool F rotated to the right is inserted into the start position Sp set on the abutting portion J1, and the rotating tool F is moved counterclockwise with respect to the sealing body 3 so as to trace the abutting portion J1. Let In the main joining step, the friction stir welding is performed in a state where the peripheral wall portion 11, the sealing body 3, the auxiliary member 4, and the stirring pin F <b> 2 of the rotary tool F are in contact with each other. Thereby, the surrounding wall part 11 (jacket main body 2), the sealing body 3, and the auxiliary member 4 are joined. A plasticizing region W2 is formed on the movement locus of the rotary tool F. Further, a part of the plasticized region W <b> 2 is in contact with the slit 5.

  In the main joining step, the connecting portion F1 and the metal member to be joined are not in contact, that is, the friction stir welding is performed in a state where the base end side of the stirring pin F2 is exposed. In the main joining process, the rotating tool F may be inserted so that the rotation center axis of the rotating tool F is parallel to the vertical direction. However, in this embodiment, the rotating tool F is rotated in the same manner as in the temporary joining process. Friction stir welding is performed with the central axis inclined to the inside of the jacket body 2.

  The insertion depth of the rotary tool F may be set as appropriate, but as shown in FIG. 6, in this embodiment, the tip of the stirring pin F2 is set to be positioned below the step bottom surface 13a. . When the rotary tool F is made a round around the sealing body 3 and the start end and the end end of the plasticizing region W2 are overlapped, the rotary tool F is detached from the metal member to be joined.

  In FIG. 6, a scene in which the rotation tool F moves from the back side to the front side of the drawing is illustrated. As shown in FIG. 6, in this embodiment, the shearing side (advancing side: the side where the moving speed of the rotating tool is added to the tangential speed on the outer periphery of the rotating tool) is the inside of the sealing body 3. Thus, the moving direction and the rotating direction of the rotating tool F are set. The rotation direction and the traveling direction of the rotary tool F are not limited to those described above, and may be set as appropriate.

  For example, when the rotational speed of the rotary tool F is low, the shear side is more than the flow side (retreating side: the side where the moving speed of the rotary tool is subtracted from the tangential speed on the outer periphery of the rotary tool). However, since the temperature of the plastic fluidized material is likely to rise, many burrs V tend to be generated on the shear side outside the plasticized region W2. On the other hand, for example, when the rotational speed of the rotary tool F is fast, the temperature of the plastic fluidized material increases on the shear side, but a larger amount of burrs V are generated on the flow side outside the plasticized region W2 because the rotational speed is faster. There is a tendency.

  In this embodiment, since the rotational speed of the rotary tool F is set high, as shown in FIG. 6, there is a tendency that many burrs V are generated on the flow side outside the plasticized region W2. On the other hand, in the present embodiment, since the auxiliary member 4 is also friction stir welded at the same time, a ditch is not generated in the plasticized region W2, and a metal shortage in the plasticized region W2 can be prevented. Further, by setting the rotation speed of the rotary tool F faster, the moving speed (feed speed) of the rotary tool F can be increased. Thereby, a joining cycle can be shortened.

  In the joining process, on which side of the traveling direction of the rotary tool F the burr V is generated depends on the joining conditions. The joining conditions include the rotational speed, rotational direction, moving speed (feeding speed) of the rotary tool F, the inclination angle (taper angle) of the stirring pin F2, the material of the jacket body 2 and the sealing body 3, and the sealing body 3 It is determined by each element such as thickness and the combination of these elements. It is preferable to set the side where the burrs V are generated or the side where a large amount of burrs V is generated to be the auxiliary member 4 side according to the joining conditions, because the removal step described later can be easily performed.

  The removal step is a step of cutting the auxiliary member 4 from the jacket body 2 as shown in FIG. In the removing step, the slit 5 (see FIG. 5) is used as a starting point, and the end of the auxiliary member 4 is turned up and bent to be removed. In the removing step, the auxiliary member 4 may be bent using an apparatus, but in the present embodiment, the auxiliary member 4 is bent and cut manually. Thereby, as shown in FIG. 8, the liquid cooling jacket 1 is completed.

  According to the manufacturing method of the jacket main body described above, by performing the temporary joining step, it is possible to prevent the opening of the butt portion J1 during the main joining step. Moreover, by performing spot temporary bonding, temporary bonding can be performed in a short time. Moreover, since the amount of heat input can be suppressed by performing spot temporary joining, the thermal distortion of the sealing body 3 can be prevented. Moreover, in this joining process, since only the stirring pin F2 is brought into contact with the metal member to be joined, the load on the friction stirrer can be reduced.

  Moreover, in this embodiment, in addition to the surrounding wall part 11 and the sealing body 3, since the auxiliary member 4 also carries out friction stir welding simultaneously, as shown in FIG. 8, the metal shortage of a junction part (plasticization area | region W2) is prevented. Can do. Further, since the auxiliary member 4 is also spot-temporarily bonded by the temporary bonding step, the position shift of the auxiliary member 4 can be prevented during the main bonding step.

  Moreover, in this embodiment, since the burr | flash V is concentrated on the auxiliary member 4 in this joining process, the burr | flash V can be removed with the auxiliary member 4 in a removal process. Thereby, the burr | flash V can be removed easily.

  Further, in the temporary joining step and the main joining step of the present embodiment, the rotation tool F can be easily placed on the inner corner by inclining the rotation center axis of the rotary tool F toward the inner side of the jacket body 2 with respect to the inner corner. Can be inserted. Moreover, in the temporary joining process and the main joining process, the type of the rotary tool F may be changed, but in the present embodiment, it is also used. Thereby, since it is not necessary to replace the rotary tool F between the temporary joining step and the main joining step, it is possible to reduce the labor and the joining cycle.

  Further, if the shoulder portion of the rotary tool is pushed into the metal member to be joined and friction stir welding is performed as in the prior art, the width of the step bottom surface 13a must be increased so that the plastic fluid material does not flow into the recess 12. However, if only the stirring pin F2 is brought into contact with the metal member to be joined as in this embodiment, the width of the plasticized region W2 can be reduced, so that the width of the step bottom surface 13a can be reduced. . Thereby, the freedom degree of design of the jacket main body 2 can be raised. Moreover, if the rotary tool F is inclined and inserted inside the jacket main body 2 as in the present embodiment, the width of the step bottom surface 13a can be further reduced.

  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.

  Further, as described above, in the auxiliary member arranging step, the auxiliary member 4 may be arranged so that the inner peripheral side surface 4d of the auxiliary member 4 is located inside the abutting portion J1. In this case, the distance from the inner peripheral side surface 4d to the butted portion J1 is appropriately set so that the plasticized region W2 does not have a metal shortage and the auxiliary member 4 does not remain on the peripheral wall portion 11 after the removal process. That's fine. By disposing the auxiliary member 4 in this way, metal shortage in the plasticized region W2 can be prevented in a well-balanced manner, and the remaining auxiliary member 4 can be easily removed. Moreover, you may abbreviate | omit a temporary joining process.

[Second Embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment is demonstrated. In the manufacturing method of the liquid cooling jacket according to the present embodiment, a preparation process, a sealing body arranging process, an auxiliary member arranging process, a main joining process, and a removing process are performed. The second embodiment is different from the first embodiment in that the auxiliary member 4 is disposed inside the abutting portion J1.

  Since the preparation step and the sealing body arrangement step are the same as those in the first embodiment, description thereof is omitted. As shown in FIG. 9, in the auxiliary member arranging step, the auxiliary member 4 is arranged inside the abutting portion J1. The auxiliary member 4 is a metal member having a frame shape and a plate shape. The thickness of the auxiliary member 4 is set so as to prevent metal shortage at the joint. A slit 5 continuous in the width direction is formed in a part of the auxiliary member 4. In the auxiliary member arranging step, the outer peripheral side surface 4e of the auxiliary member 4 and the butted portion J1 are arranged so as to overlap (see also FIG. 11).

  In the main joining step, as shown in FIG. 10, the butt joint J <b> 1 is friction stir welded using the rotary tool F. In the main joining step, the rotary tool F rotated left at high speed is inserted into the start position Sp set in the butt portion J1, and is relatively moved along the butt portion J1. In this embodiment, it sets so that the auxiliary member 4 may be located in the left direction of the rotation tool F in the advancing direction. As shown in FIG. 11, in the main joining step, the rotary tool F is inclined to the outside of the jacket body 2, and the stirring pin F <b> 2 is slanted at the inner corner between the outer peripheral side surface 4 e of the auxiliary member 4 and the end surface 11 a of the peripheral wall portion 11. Friction stir welding is performed in the inserted state. In the main joining step, the rotating tool F is rotated counterclockwise at high speed, and the auxiliary member 4 is disposed on the left side in the traveling direction, so that a burr V is generated on the auxiliary member 4 side which is the flow side. In the main joining step, the rotary tool F is made to make a round along the abutting portion J1, and the distal end and the proximal end of the plasticizing region W3 are overlapped.

  In the removing step, the auxiliary member 4 is removed from the sealing body 3. In the removing step, the slit 5 is raised and the end of the auxiliary member 4 is bent to remove the auxiliary member 4 from the sealing body 3.

  In the present embodiment, in addition to the peripheral wall portion 11 and the sealing body 3, the auxiliary member 4 is also friction stir welded at the same time, so that metal shortage in the joint portion (plasticization region W3) can be prevented. In this joining process, since only the stirring pin F2 is brought into contact with the metal member to be joined, the load on the friction stirrer can be reduced. The burr V can be easily removed together with the auxiliary member 4 while concentrating the burr V on the auxiliary member 4.

  Although the manufacturing method of the liquid cooling jacket of the present invention has been described above, the design can be changed as appropriate without departing from the spirit of the present invention. For example, in the main joining step of the present embodiment, the friction stir welding is performed by inclining the rotary tool F, but the friction stir welding may be performed in a state where the rotation center axis and the vertical axis are parallel to each other.

  Further, the auxiliary member 4 may be disposed so as to straddle the abutting portion J1, and the friction stir welding may be performed by inserting the rotary tool F from the surface of the auxiliary member 4. Moreover, in 2nd embodiment, you may incline the rotary tool F to the right side, and you may perform spot temporary joining. Further, as the rotary tool F, different rotary tools may be used in the temporary joining process and the main joining process.

DESCRIPTION OF SYMBOLS 1 Liquid cooling jacket 2 Jacket body 3 Sealing body 10 Bottom part 11 Peripheral wall part 11a End surface 13 Recessed part F Rotating tool F2 Stirring pin J1 Butting part W1 Plasticization area W2 Plasticization area

Claims (8)

A method for manufacturing a liquid cooling jacket, in which a jacket body and a sealing body are friction stir welded to form a liquid cooling jacket,
Forming a jacket body having a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, a step bottom surface formed at a position one step down from an end surface of the peripheral wall portion, and a step side surface rising from the step bottom surface; A preparation step of forming a sealing body for sealing the opening of the main body;
A sealing body disposing step of disposing the sealing body on the jacket body and abutting the step side surface and the outer peripheral side surface of the sealing body to form a butted portion;
An auxiliary member arranging step of arranging an auxiliary member along the abutting portion;
A main joining step of performing a friction stir welding by making a round of the rotating tool for main welding along the abutting portion,
The main joining rotary tool includes a stirring pin longer than the thickness of the sealing body,
In the main joining step, the liquid cooling jacket manufacturing method is characterized in that friction stir welding is performed on the butt portion in a state where only the stirring pin is in contact with the peripheral wall portion, the sealing body, and the auxiliary member. In the main joining step, a joining condition is set so that burrs are generated in the auxiliary member,
The method for manufacturing a liquid cooling jacket according to claim 1, further comprising a removing step of removing the auxiliary member on which the burr is formed.   3. The liquid cooling according to claim 1, wherein in the main joining step, friction stir welding is performed in a state in which a rotation center axis of the main welding rotary tool is inclined toward the inner side of the jacket body. The manufacturing method of a jacket.   3. The liquid cooling according to claim 1, wherein in the main joining step, friction stir welding is performed in a state in which a rotation center axis of the main welding rotary tool is inclined to the outside of the jacket main body. The manufacturing method of a jacket. A temporary joining step of temporarily joining by temporarily inserting a rotary tool for temporary joining along the abutting portion;
In the temporary bonding step, spot temporary bonding is performed on the butt portion in a state where only the stirring pin of the rotary tool for temporary bonding is in contact with the peripheral wall portion, the sealing body, and the auxiliary member. The manufacturing method of the liquid cooling jacket as described in any one of Claims 1 thru | or 4.   6. The method of manufacturing a liquid cooling jacket according to claim 5, wherein, in the temporary bonding step, spot temporary bonding is performed in a state in which a rotation center axis of the temporary bonding rotary tool is inclined toward the inner side of the jacket body. .   6. The method of manufacturing a liquid cooling jacket according to claim 5, wherein, in the temporary bonding step, spot temporary bonding is performed in a state where a rotation center axis of the temporary bonding rotary tool is inclined to the outside of the jacket main body. .   The method for manufacturing a liquid cooling jacket according to any one of claims 5 to 7, wherein the rotary tool for temporary bonding is the same as the rotary tool for main bonding.

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