JP2019188414A - Liquid-cooled jacket manufacturing method - Google Patents

Abstract

To provide a liquid-cooled jacket manufacturing method in which aluminium alloy made of different kinds of materials can be suitably welded.SOLUTION: The liquid-cooled jacket manufacturing method includes: a first main welding step in which friction stirring is performed while not contacting an outer peripheral surface of a stirring pin F2 with an uneven side surface of a peripheral wall part, moving a rotary tool F along a first butted part and flowing second aluminium alloy of a sealing body 3 into a gap; and a second main welding step in which friction stirring is performed to a fourth butted part J4 while inserting only the rotating stirring pin F2 into the sealing body 3 and slightly contacting the stirring pin F2 with an end face of a support post 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. 16 is a cross-sectional view showing a conventional method for manufacturing a liquid cooling jacket. In the conventional liquid cooling jacket manufacturing method, a butt J10 formed by abutting a step side surface 101c provided on a step portion of an aluminum alloy jacket body 101 and a side surface 102c of an aluminum alloy sealing body 102. Friction stir welding is performed. Further, in the conventional method of manufacturing a liquid cooling jacket, friction stir welding is performed by inserting only the stirring pin F2 of the rotary tool F into the abutting portion J10. Further, in the conventional method for manufacturing a liquid cooling jacket, the rotation center axis C of the rotary tool F is overlapped with the abutting portion J10 and relatively moved.

Japanese Patent Laying-Open No. 2015-131321

  Here, the jacket body 101 is likely to have a complicated shape. For example, the jacket body 101 is formed of a cast material of 4000 series aluminum alloy, and a relatively simple shape such as the sealing body 102 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 101 is generally harder than the sealing body 102, when the friction stir welding is performed as shown in FIG. The material resistance received from the jacket main body 101 side is larger than the material resistance received from. For this reason, it is difficult to stir different materials in a balanced manner by the stirring pin 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 capable of suitably joining aluminum alloys having different material 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 recess into which a tip end of the support column is inserted. A liquid cooling jacket manufacturing method comprising: a sealing body that seals an opening; and joining the jacket body and the sealing body by friction stir, wherein the jacket body is formed of a first aluminum alloy. The sealing body is made of a second aluminum alloy, and the first aluminum alloy is a material having a hardness higher than that of the second aluminum alloy, and the outer periphery of the stirring pin of the rotary tool used for friction stirring. The surface is inclined so as to be tapered, and on the inner peripheral edge of the peripheral wall portion, a step bottom surface and spread outward from the step bottom surface toward the opening. And forming a stepped portion having a stepped bottom surface and a stepped side surface rising from the step bottom at the tip of the column, and forming the sealing step A preparatory step of forming the sealing body such that the plate thickness of the body is larger than the height dimension of the step side surface of the peripheral wall step portion, and placing the sealing body on the jacket body, The first butting portion so that there is a gap between the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body when the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are butted together And forming a second butt portion by overlapping the step bottom surface of the peripheral wall step portion and the back surface of the sealing body, and further forming a step side surface of the column step portion and the concave portion of the sealing body. Match the inner wall Forming a third butting portion, placing the end face of the support column and the bottom surface of the concave portion to form a fourth butting portion, and inserting only the rotating stirring pin into the sealing body, While the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the peripheral wall portion, the rotating tool is moved along the first abutting portion, and the second aluminum alloy of the sealing body is allowed to flow into the gap. In the first main joining step for performing frictional stirring, only the rotating stirring pin is inserted into the sealing body, and the stirring pin is slightly in contact with the end face of the support column, with respect to the fourth butted portion. And a second main joining step in which frictional stirring is performed.

  According to this manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the step side surface and the seal are sealed in the first butt portion. The outer peripheral side surface of the body can be joined. Further, in the first butting portion, only the stirring pin is brought into contact with only the sealing body to perform frictional stirring, so that the first aluminum alloy is hardly mixed into the sealing body from the jacket body. In the fourth butting portion, only the stirring pin is kept in slight contact with the end face of the support column. Thereby, in the 1st butt | matching part and the 4th butt | matching part, since the 2nd aluminum alloy by the side of a sealing body is mainly friction-stirred, the fall of joining strength can be suppressed. Moreover, since the step side surface of the jacket body is inclined outward, contact between the stirring pin and the jacket body can be easily avoided without causing a decrease in bonding strength. Further, the strength of the liquid cooling jacket can be increased by joining the support column and the sealing body. Moreover, the metal shortage of a junction part can be prevented by enlarging the plate | board thickness of a sealing body.

  Further, in the first main joining step, it is preferable that friction stirring is performed in a state where the stirring pin is slightly in contact with the bottom surface of the step of the peripheral wall step portion.

  According to this manufacturing method, the joint strength of the second butt portion can be increased.

  Further, the stirring pin has a flat surface perpendicular to the rotation center axis at the tip, and has a protrusion on the flat surface, and in the second main joining step, only the rotating stirring pin is sealed. Inserted into the body, and the flat surface of the stirring pin is in contact with only the sealing body, while the protrusion of the stirring pin is in contact with the end surface of the support column, the friction against the fourth butting portion It is preferable to perform stirring.

  According to this manufacturing method, since the stirring pin has a flat surface and a protrusion protruding on the flat surface, the plastic that is frictionally stirred along the protrusion and wound up on the protrusion. The fluidized material is held down on a flat surface. Accordingly, the periphery of the protrusion can be more reliably frictionally stirred, and the oxide film at the interface can be reliably divided, so that the bonding strength can be increased.

  In addition, 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, a recess into which a tip of the support column is inserted, and sealing an opening portion of the jacket body. A liquid cooling jacket manufacturing method comprising: a sealing body, wherein the jacket body and the sealing body are joined by friction stir, wherein the jacket body is formed of a first aluminum alloy, The body is made of a second aluminum alloy, the first aluminum alloy is a material having a hardness higher than that of the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stirring is tapered. The bottom surface of the step is inclined to the inner peripheral edge of the peripheral wall portion so as to spread outward from the step bottom surface toward the opening. Forming a peripheral wall step portion having a step side surface, and forming a column step portion having a step bottom surface and a step side surface rising from the step bottom surface at the tip of the column, and the plate thickness of the sealing body A step of forming the sealing body so as to be larger than a height dimension of the step side surface of the peripheral wall stepped portion, and placing the sealing body on the jacket body, Forming a first butting portion so that there is a gap between the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body when the step side surface and the outer peripheral side surface of the sealing body are butted , The step bottom surface of the peripheral wall step portion and the back surface of the sealing body are overlapped to form a second abutting portion, and the step side surface of the column step portion and the inner wall of the concave portion of the sealing body are abutted To form the third butt In addition, the mounting step of forming the fourth butting portion by overlapping the end surface of the support column and the bottom surface of the recess, and inserting only the rotating stirring pin into the sealing body, the outer peripheral surface of the stirring pin is Friction stir while moving the rotary tool along the first abutting portion and allowing the second aluminum alloy of the sealing body to flow into the gap while slightly contacting the step side surface of the peripheral wall portion The first main joining step is performed, and only the rotating stirring pin is inserted into the sealing body, and the stirring pin is slightly brought into contact with the end surface of the support column, and the friction against the fourth butted portion. And a second main joining step in which stirring is performed.

  According to this manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the step side surface and the seal are sealed in the first butt portion. The outer peripheral side surface of the body can be joined. Moreover, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the jacket body, mixing of the first aluminum alloy from the jacket body to the sealing body can be minimized. Moreover, since the stirring pin is kept in slight contact with the end face of the support column also in the fourth butting portion, it is possible to minimize the mixing of the first aluminum alloy from the jacket body into the sealing body. Thereby, in the 1st butt | matching part and the 4th butt | matching part, since the 2nd aluminum alloy by the side of a sealing body is mainly friction-stirred, the fall of joining strength can be suppressed. Moreover, since the step side surface of the jacket main body is inclined outward, the first butting portion can be joined without the agitation pin entering the jacket main body side greatly. Further, the strength of the liquid cooling jacket can be increased by joining the support column and the sealing body. Moreover, the metal shortage of a junction part can be prevented by enlarging the plate | board thickness of a sealing body.

  Further, in the first main joining step, it is preferable that friction stirring is performed in a state where the stirring pin is slightly in contact with the bottom surface of the step of the peripheral wall step portion.

  According to this manufacturing method, the joint strength of the second butt portion can be increased.

  Further, the stirring pin has a flat surface perpendicular to the rotation center axis at the tip, and has a protrusion on the flat surface, and in the second main joining step, only the rotating stirring pin is sealed. Inserted into the body, and the flat surface of the stirring pin is in contact with only the sealing body, while the protrusion of the stirring pin is in contact with the end surface of the support column, the friction against the fourth butting portion It is preferable to perform stirring.

  According to this manufacturing method, since the stirring pin has a flat surface and a protrusion protruding on the flat surface, the plastic that is frictionally stirred along the protrusion and wound up on the protrusion. The fluidized material is held down on a flat surface. Accordingly, the periphery of the protrusion can be more reliably frictionally stirred, and the oxide film at the interface can be reliably divided, so that the bonding strength can be increased.

  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 the first butting portion during the first main joining step by performing temporary joining.

  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.

  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.

  Further, it is preferable that the surface of the cooling plate and the back surface of the bottom portion are brought into 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 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. 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. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows after the 1st main joining process of a manufacturing method to the liquid cooling jacket which concerns on 1st embodiment. 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. 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. It is sectional drawing which shows the 1st modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the 2nd modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid cooling jacket which concerns on 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 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. It is a perspective view which shows the table of the 4th modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the state which fixed the jacket main body and sealing body of the 4th modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment 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. 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 concern on 1st embodiment 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 embodiment of this invention is demonstrated in detail with reference to drawings. As shown in FIG. 1, a liquid cooling jacket 1 is manufactured by friction stir welding a jacket body 2 and a 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.

  As shown in FIG. 1, the bottom 10 is a plate-like member having 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 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. A recess 13 is formed at the bottom 10 and the peripheral wall 11.

  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. A protrusion 16 is formed at the tip of the column 15. The shape of the protrusion 16 is not particularly limited, but in the present embodiment, it is a columnar shape. The height of the protruding portion 16 is substantially half the plate thickness of the sealing body 3. A columnar step 17 is formed on the tip side of the column 15. The columnar stepped portion 17 includes a stepped bottom surface 17a and a stepped side surface (side surface of the protruding portion 16) 17b rising from the stepped bottom surface 17a. The step bottom surface 17 a 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 | board thickness of the sealing body 3 is larger than the level | step difference side surface 12b. A recess 4 is formed in the sealing body 3 at a position corresponding to the support column 15. The recessed part 4 is opened toward the lower side, and is formed so that the protruding part 16 is fitted with almost no gap. 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. The step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are butted to form the first butted portion J1. 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.

  Moreover, the peripheral wall 4a of the recessed part 4 and the level | step difference side surface 17b of the support | pillar level | step-difference part 17 are abutted by the mounting process, and the 3rd abutting part J3 is formed. Further, the bottom surface 4b of the recess 4 and the tip end surface 16a of the protrusion 16 of the support column 15 (end surface of the support column 15) are abutted to form a fourth abutting portion J4.

  As shown in FIGS. 3 and 4, the first main joining step is a step of friction stir welding the first butt portion J <b> 1 using the rotary tool F. 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 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 is tapered as it is separated from the connecting portion F1. As shown in FIG. 4, 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. When viewed from the side, the inclination angle α formed by the rotation center axis C and the outer peripheral surface of the stirring pin F2 may be set as appropriate within a range of 5 ° to 30 °, for example. Is set to be the same as the inclination angle β of the step side surface 12b.

  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 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, the second aluminum alloy of the sealing body 3 flows into the gap between the first abutting portions J1 with only the rotating stirring pin F2 inserted into the sealing body 3. The stirring pin F2 is made to make a round along the first butting portion J1. In the present embodiment, the insertion depth of the stirring pin F2 and the outer surface of the stirring pin F2 are not brought into contact with the step side surface 12b of the peripheral wall stepped portion 12, and the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a. The position is set.

  Here, “the state in which the outer peripheral surface of the stirring pin F2 is not in contact with the step side surface 12b of the peripheral wall step portion 12” means that the outer peripheral surface of the stirring pin F2 is in contact with the jacket main body 2 during friction stirring. This may include a case where the distance between the outer peripheral surface of the stirring pin F2 and the step side surface 12b is zero. In addition, “the flat surface F3 of the stirring pin F2 does not contact the step bottom surface 12a of the peripheral wall step portion 12” means that the flat surface F3 of the stirring pin F2 contacts the jacket body 2 when performing frictional stirring. This may include a case where the distance between the flat surface F3 of the stirring pin F2 and the step bottom surface 12a is zero.

  If the distance from the step side surface 12b to the outer peripheral surface of the stirring pin F2 is too far, the bonding strength of the first butting portion J1 is lowered. The separation distance L from the step side surface 12b to the outer peripheral surface of the stirring pin F2 may be set as appropriate depending on the material of the jacket body 2 and the sealing body 3, but the outer peripheral surface of the stirring pin F2 is set to the step side surface 12b as in the present embodiment. When the flat surface F3 is not brought into contact with the step bottom surface 12a, for example, 0 ≦ L ≦ 0.5 mm is set, and preferably 0 ≦ L ≦ 0.3 mm. On the other hand, the flat surface F3 of the stirring pin F2 is located above the step bottom surface 12a and is not in contact with the step bottom surface 12a.

  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 plasticized region W1 is formed on the sealing body 3 side with the first butted portion J1 as a boundary. The plasticized region W1 is formed so as to reach the jacket body 2 beyond the second butted portion J2.

  The second main joining step is a step of friction stir welding the fourth butted portion J4 using the rotary tool F as shown in FIGS. 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.

  In the second main joining step, as shown in FIG. 7, only the rotating stirring pin F2 is inserted into the sealing body 3, and the flat surface F3 of the stirring pin F2 is used as the end surface of the support column 15 (the tip surface 16a of the protruding portion 16). Friction stirring is performed on the fourth butted portion J4 in a state where it is slightly contacted. The stirring pin F <b> 2 is relatively moved along the outer peripheral edge of the recess 4. When the rotating tool F makes a round along the outer peripheral edge portion of the protruding portion 16, the start end and the end end of the plasticizing region W2 are overlapped.

  According to the manufacturing method of the liquid cooling jacket according to the present embodiment described above, 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 are used. The second aluminum alloy mainly on the sealing body 3 side of the first butted portion J1 is agitated and plastically fluidized by the frictional heat between the stepped side surface 12b and the outer peripheral side surface 3c of the sealing body 3 at the first butting portion J1. Can be joined. Moreover, since friction stirring is performed by bringing only the stirring pin F2 into contact with only the sealing body 3, the first aluminum alloy is hardly mixed from the jacket body 2 to the sealing body 3. Thereby, 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 joint 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, since the inclination angle β 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 of the stirring pin F2 are parallel), the stirring pin F2 While avoiding contact with the step side surface 12b, the stirring pin F2 and the step side surface 12b can be brought as close as possible.

  Further, in the first main joining step, only the stirring pin F2 is brought into contact with only the sealing body 3 to perform friction stir welding, so that the stirring pin is provided on one side and the other side with respect to the rotation center axis C of the stirring pin F2. The material resistance imbalance experienced by F2 can be eliminated. Thereby, since a plastic fluidized material is friction-stirred with sufficient balance, the fall of joining strength can be suppressed.

  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 joined portion is reduced by rotating the rotating tool in the direction opposite to the moving direction of the rotating tool.

  Moreover, since the plate | board thickness of the sealing body 3 is made larger than the level | step difference side surface 12b, the metal shortage of a junction part (1st butt | matching part J1) can be prevented. Moreover, heat conduction efficiency can be improved by enlarging the plate | board thickness of the sealing body 3. FIG.

  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.

  Further, in the first butting portion J1, in this embodiment, the flat surface F3 of the stirring pin F2 is not inserted deeper than the step bottom surface 12a, but joining is performed by allowing the plasticized region W1 to reach the second butting portion J2. Strength can be increased.

  Further, in the fourth abutting portion J4, friction stir with respect to the fourth abutting portion J4 in a state where the flat surface F3 of the agitating pin F2 is slightly in contact with the end surface of the support column 15 (the front end surface 16a of the protruding portion 16). It is carried out. Thereby, in the 4th butt | matching part J4, while being able to prevent mixing of the 1st aluminum alloy from the support | pillar 15 of the jacket main body 2 to the sealing body 3 as much as possible, the 2nd aluminum alloy by the side of the sealing body 3 is mainly made. Since frictional stirring is performed, a decrease in bonding strength can be suppressed. Further, the strength of the liquid cooling jacket can be increased by joining the support column 15 and the sealing body 3 together.

  Moreover, since the protrusion 16 at the tip of the support column 15 is inserted into the recess 4 of the sealing body 3, the sealing body 3 can be easily positioned with respect to the jacket body 2.

  Note that either the first main bonding step or the second main bonding step may be performed first. In addition, before the first main joining step and the second main joining step, temporary joining may be performed on the first butted portion J1 by friction stirring or welding. By performing the temporary joining step, it is possible to prevent the opening of the first butted portion J1 during the first main joining step or the second main joining step.

[First modification]
Next, a first modification of the first embodiment will be described. As shown to FIG. 8A, in the 2nd main joining process of the 1st modification of 1st embodiment, friction stirring is performed using rotary tool FA. The rotary tool FA includes a connecting portion F1 and a stirring pin F2. The agitation pin F2 includes a flat surface F3 that is flat with respect to the rotation center axis C, and a protrusion F4 that protrudes from the flat surface F3.

  In the second main joining step, the stirring pin F2 is inserted from the surface 3a of the sealing body 3, and the friction stir welding of the fourth butted portion J4 is performed. In the second main joining step, the agitation pin F2 is made so that the tip surface F5 of the protrusion F4 is brought into contact with the support column 15 (protrusion 16) while the flat surface F3 of the agitation pin F2 is brought into contact only with the sealing body 3. Set the insertion depth. In other words, the insertion depth of the stirring pin F2 is set so that the side surface of the protrusion F4 is positioned at the fourth butting portion J4.

  According to the second main joining step, since the tip end surface F5 of the protrusion F4 of the stirring pin F2 is inserted deeper than the tip end surface 16a of the protrusion 16, the friction stir along the protrusion F4 causes the protrusion. The plastic fluid material wound up on the portion F4 is pressed by the flat surface F3. As a result, the friction around the protrusion F4 (fourth abutting portion J4) can be more reliably agitated and the oxide film of the fourth abutting portion J4 can be reliably divided. Thereby, the joint strength of the fourth butted portion J4 can be further increased.

[Second modification]
Next, a second modification of the first embodiment will be described. As in the second modified example shown in FIG. 8B, the peripheral wall 4a of the concave portion 4 of the sealing body 3 and the step side surface 17b (side surface of the protruding portion 16) of the column step portion 17 are inclined to form a tapered inclined surface. May be provided. The inclined surface of the concave portion 4 is inclined so that the concave portion 4 is reduced in diameter toward the bottom surface 4b. The protruding portion 16 is inclined so as to be reduced in diameter toward the tip. Thereby, since the protrusion part 16 is guided to the recessed part 4, the operation | work which inserts the protrusion part 16 into the recessed part 4 can be performed smoothly.

[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, the placing process, and the second main joining process are the same as those in the first embodiment, and thus the description thereof is omitted. Moreover, in 2nd embodiment, it demonstrates centering on the part which is different from 1st embodiment.

  As shown in FIG. 9, the first main joining step is a step of friction stir welding of the first butting portion J <b> 1 using the rotary tool F. In the main joining step, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface of the stirring pin F2 is slightly brought into contact with the step side surface 12b of the peripheral wall step portion 12, and the flat surface F3 is formed. Friction stir welding is performed so as not to contact the step bottom surface 12a.

  Here, the contact amount of the outer peripheral surface 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 of the stirring pin F2 is in contact with the step side surface 12b and the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a as in the present embodiment, the offset amount N is set to 0 <N ≦ 0. Set between .5 mm, preferably between 0 <N.ltoreq.0.25 mm.

  In the conventional liquid cooling jacket manufacturing method shown in FIG. 16, since the hardness differs between the jacket main body 101 and the sealing body 102, the stirring pin F2 receives on one side and the other side across the rotation center axis C. Material resistance is also very different. For this reason, the plastic fluidized material is not agitated in a well-balanced manner, which has been a factor in reducing the bonding strength. However, according to the present embodiment, since the contact allowance between the outer peripheral surface of the stirring pin F2 and the jacket body 2 is made as small as possible, the material resistance that the stirring pin F2 receives from the jacket body 2 can be made as small as possible. In the present embodiment, the inclination angle β of the step side surface 12b of the peripheral wall step portion 12 and the inclination angle α of the stirring pin F2 are the same (the step side surface 12b and the outer peripheral surface of the stirring pin F2 are parallel). The contact allowance between the stirring pin F2 and the step side surface 12b can be made uniform over the height direction. Thereby, in this embodiment, since a plastic fluid material is stirred with sufficient balance, the strength reduction of a junction part can be suppressed.

[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 3rd 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 third embodiment, a description will be given focusing on portions that are different from the first embodiment.

  The first main joining step is a step of friction stir welding the jacket body 2 and the sealing body 3 using the rotary tool F as shown in FIG. In the main joining step, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface of the stirring pin F2 is not brought into contact with the step side surface 12b, and the flat surface F3 is deeper than the step bottom surface 12a. The friction stir welding is performed in a state where the step is inserted and slightly brought into contact with the step bottom surface 12 a of the peripheral wall step portion 12.

  According to the manufacturing method of the liquid cooling jacket according to the present embodiment, the stir pin F2 and the step side surface 12b of the peripheral wall step portion 12 are not in contact with each other, but the first butt is caused by frictional heat between the sealing body 3 and the stir pin F2. The second aluminum alloy mainly on the sealing body 3 side of the portion J1 is agitated and plastically fluidized, and the stepped side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be joined at the first butt portion J1. Further, in the first butting portion J1, only the stirring pin F2 is brought into contact with only the sealing body 3 to perform frictional stirring, so that the first aluminum alloy is hardly mixed from the jacket body 2 into the sealing body 3. Thereby, 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 joint strength can be suppressed.

  Further, since the step side surface 12b of the jacket body 2 is inclined outward, contact between the stirring pin F2 and the step side surface 12b can be easily avoided. In this embodiment, since the inclination angle β 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 of the stirring pin F2 are parallel), the stirring pin F2 Stepped side surface 12b While avoiding the contact, stirring pin F2 and stepped side surface 12b can be brought as close as possible.

  Further, since friction stir welding is performed by separating the outer peripheral surface of the stirring pin F2 from the step side surface 12b, the material resistance that the stirring pin F2 receives on one side and the other side with respect to the rotation center axis C of the stirring pin F2 is reduced. The balance can be reduced. Thereby, since a plastic fluidized material is friction-stirred with sufficient balance, the fall of joining strength can be suppressed. When the outer peripheral surface of the stirring pin F2 is not brought into contact with the step side surface 12b and the flat surface F3 is inserted deeper than the step bottom surface 12a as in the present embodiment, the distance from the step side surface 12b to the outer peripheral surface of the stirring pin F2 is increased. The separation distance L is set, for example, to 0 ≦ L ≦ 0.5 mm, preferably 0 ≦ L ≦ 0.3 mm.

  Further, by inserting the flat surface F3 of the stirring pin F2 into the step bottom surface 12a, the lower part of the joint can be frictionally stirred more reliably. Thereby, it is possible to prevent the occurrence of a cavity defect or the like in the plasticized region W1 and increase the bonding strength. Further, the entire flat surface F3 of the stirring pin F2 is located closer to the center of the sealing body 3 than the outer peripheral side surface 3c of the sealing body 3. Thereby, since the joining area | region of the 2nd butt | matching part J2 can be enlarged, joining strength can be raised.

[Fourth embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on 4th embodiment of this invention is demonstrated. The manufacturing method of the liquid cooling jacket which concerns on 4th embodiment performs a preparatory process, a mounting process, a 1st main joining process, and a 2nd main joining process. 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 portions that are different from the third embodiment.

  As shown in FIG. 11, the first main joining step is a step of friction stir welding of the first butting portion J1 using the rotary tool F. In the main joining step, when the stirring pin F2 is relatively moved along the first abutting portion J1, the outer peripheral surface of the stirring pin F2 is slightly brought into contact with the step side surface 12b of the peripheral wall step portion 12, and the flat surface F3 is formed. Friction stir welding is performed in a state of being inserted deeper than the step bottom surface 12 a and slightly contacting the step bottom surface 12 a of the peripheral wall step portion 12.

  Here, the contact amount of the outer peripheral surface of the stirring pin F2 with respect to the step side surface 12b is defined as an offset amount N. As in this embodiment, when the flat surface F3 of the stirring pin F2 is inserted deeper than the step bottom surface 12a of the peripheral wall step portion 12, and the outer peripheral surface of the stirring pin F2 is brought into contact with the step side surface 12b, the offset amount N Is set between 0 <N ≦ 1.0 mm, preferably between 0 <N ≦ 0.85 mm, and more preferably between 0 <N ≦ 0.65 mm.

  In the conventional liquid cooling jacket manufacturing method shown in FIG. 16, since the hardness differs between the jacket main body 101 and the sealing body 102, the stirring pin F2 receives on one side and the other side across the rotation center axis C. Material resistance is also very different. For this reason, the plastic fluidized material is not agitated in a well-balanced manner, which has been a factor in reducing the bonding strength. However, according to the present embodiment, since the contact allowance between the outer peripheral surface of the stirring pin F2 and the jacket body 2 is made as small as possible, the material resistance that the stirring pin F2 receives from the jacket body 2 can be reduced. In this embodiment, since the inclination angle β 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 of the stirring pin F2 are parallel), the stirring pin F2 The contact allowance with the step side surface 12b can be made uniform over the height direction. Thereby, in this embodiment, since a plastic fluid material is stirred with sufficient balance, the strength reduction of a junction part can be suppressed.

  Further, by inserting the flat surface F3 of the stirring pin F2 into the step bottom surface 12a, the lower part of the joint can be frictionally stirred more reliably. Thereby, it is possible to prevent the occurrence of a cavity defect or the like in the plasticized region W1 and increase the bonding strength. That is, both the first butting portion J1 and the second butting portion J2 can be firmly joined.

[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. 12, the third modified example 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.

  As shown in FIG. 12, 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, the friction stir welding is performed while flowing the 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 to FIG. 13A and 13B, in the 4th modification of 1st embodiment, the surface side of the jacket main body 2 and the surface 3a of the sealing body 3 are curved so that it may become convex. It differs from the first embodiment in that the joining step and the second main joining step are performed. The fourth modification will be described with a focus on the differences from the first embodiment.

  As shown in FIGS. 13A and 13B, the fourth modification uses a table KA. 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, the jacket main body 2 and the sealing body 3 integrated by performing the temporary joining process are fixed to the table KA by the clamp KA3. The plasticized region W is formed by the temporary joining process. As shown in FIG. 13A, when the jacket main body 2 and the sealing body 3 are fixed to the table KA, the bottom 10 of the jacket main body 2, the peripheral wall end surface 11a, and the surface 3a of the sealing body 3 are curved upward. To do. 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 modified example, friction stir welding is performed using the rotary tool F. 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 F2 is adjusted according to the deformation amount. Friction stir welding is performed. In other words, the rotary tool F is moved along the curved surfaces of the peripheral wall end surface 11a of the jacket body 2 and the surface 3a of the sealing body 3 so as to be curved. By doing in this way, the depth and width | variety of plasticizing area | region W1, W2 can be made constant.

  Although heat shrinkage occurs in the plasticized regions W1 and W2 due to heat input of the friction stir welding, the sealing body 3 side of the liquid cooling jacket 1 may be deformed into a concave shape, but the first main joining step of the fourth modification example According to the second main joining step, since the jacket body 2 and the sealing body 3 are fixed in advance so that tensile stress acts on the peripheral wall end surface 11a and the surface 3a, the heat shrinkage after the friction stir welding is achieved. The liquid cooling jacket 1 can be flattened by using. 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 operation is performed. There is a problem that the nature is bad. However, according to the fourth modification, since the shoulder portion does not exist in the rotary tool F, the operability of the rotary tool F is good even when the jacket body 2 and the sealing body 3 are warped in a convex shape. It becomes.

  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.

  Moreover, in the said 4th modification, although the height position of the stirring pin F2 was changed according to the deformation amount of the jacket main body 2 or the sealing body 3, the height of the stirring pin F2 with respect to the table KA was made constant, and this joining process May be performed.

  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 F may be attached to, for example, a robot arm provided with a rotation driving means such as a spindle unit at the tip. According to such a configuration, the rotation center axis of the rotary tool F 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. 14, 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 to be curved in a convex shape on the surface side in advance. Is 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. 15, 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 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 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 on the first butting portion J1 and the second butting portion J2 using the rotary tool F, respectively. 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 F2 is adjusted according to the deformation amount. Friction stir welding is performed. In other words, the rotary tool F 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 becomes a curve or a straight line. By doing in this way, the depth and width | variety of the plasticization area | region W1 can be made constant.

  Although heat shrinkage occurs in the plasticized regions W1 and W2 due to heat input of the friction stir welding, the sealing body 3 side of the liquid cooling jacket 1 may be deformed into a concave shape, but the first main joining process of the fifth modification example According to the second main joining step, since the jacket body 2 and the sealing body 3 are formed in a convex shape in advance, the liquid cooling jacket 1 is flattened by utilizing the heat shrinkage after the friction stir welding. Can do.

  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.

  Moreover, in the said 5th modification, although the height position of the stirring pin F2 was changed according to the deformation amount of the jacket main body 2 or the sealing body 3, the height of the stirring pin F2 with respect to the table KB was made constant, and this joining process May be performed.

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 Concave portion 17 Strut step portion 17a Step bottom surface 17b Tool F2 Stirring pin J1 First abutting part J2 Second abutting part J3 Third abutting part J4 Fourth abutting part K Table (cooling plate)
W1 Plasticization region W2 Plasticization region WP Cooling pipe

Claims (14)

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 includes a recess into which a tip end of the support column is inserted and seals an opening of the jacket body A manufacturing method of a liquid cooling jacket for joining the jacket body and the sealing body 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 rotary tool used for friction stirring is inclined so as to be tapered,
A peripheral wall step portion having a step bottom surface and a step side surface rising obliquely so as to spread outward from the step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion, and at the tip of the column The column step portion having a step bottom surface and a step side surface rising from the step bottom surface is formed, and the plate thickness of the sealing body is larger than the height dimension of the step side surface of the peripheral wall step portion. A preparation step of forming a sealing body;
By placing the sealing body on the jacket main body, when the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted, the step side surface of the peripheral wall step portion and the sealing body Forming the first butting portion so that there is a gap between the outer peripheral side surface, and forming the second butting portion by overlapping the step bottom surface of the peripheral wall step portion and the back surface of the sealing body; A third abutting portion is formed by abutting the step side surface of the strut step portion and the inner wall of the recess of the sealing body, and a fourth abutting portion is formed by overlapping the end surface of the strut and the bottom surface of the recess. A mounting process to perform,
Insert only the rotating stirring pin into the sealing body, move the rotating tool along the first abutting portion without bringing the outer peripheral surface of the stirring pin into contact with the stepped side surface of the peripheral wall portion, A first main joining step of performing frictional stirring while allowing the second aluminum alloy of the sealing body to flow into the gap;
A second main joining step in which only the rotating stirring pin is inserted into the sealing body, and the stirring pin is slightly in contact with the end face of the support column, and friction stirring is performed on the fourth abutting portion; The manufacturing method of the liquid cooling jacket characterized by including.   2. The method of manufacturing a liquid cooling jacket according to claim 1, wherein, in the first main joining step, friction stirring is performed in a state where the stirring pin is slightly in contact with the bottom surface of the step portion of the peripheral wall. . The stirring pin has a flat surface perpendicular to the rotation center axis at the tip, and has a protrusion on the flat surface,
In the second main joining step, only the rotating stirring pin is inserted into the sealing body, and the flat surface of the stirring pin is brought into contact with only the sealing body, and the protruding portion of the stirring pin is attached to the support column. The method for producing a liquid-cooled jacket according to claim 1 or 2, wherein friction stirring is performed on the fourth butted portion in a state of being in contact with the end surface of the liquid-cooling jacket. 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 includes a recess into which a tip end of the support column is inserted and seals an opening of the jacket body A manufacturing method of a liquid cooling jacket for joining the jacket body and the sealing body 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 rotary tool used for friction stirring is inclined so as to be tapered,
A peripheral wall step portion having a step bottom surface and a step side surface rising obliquely so as to spread outward from the step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion, and at the tip of the column The column step portion having a step bottom surface and a step side surface rising from the step bottom surface is formed, and the plate thickness of the sealing body is larger than the height dimension of the step side surface of the peripheral wall step portion. A preparation step of forming a sealing body;
By placing the sealing body on the jacket main body, when the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted, the step side surface of the peripheral wall step portion and the sealing body Forming the first butting portion so that there is a gap between the outer peripheral side surface, and forming the second butting portion by overlapping the step bottom surface of the peripheral wall step portion and the back surface of the sealing body; A third abutting portion is formed by abutting the step side surface of the strut step portion and the inner wall of the recess of the sealing body, and a fourth abutting portion is formed by overlapping the end surface of the strut and the bottom surface of the recess. A mounting process to perform,
Only the rotating stirring pin is inserted into the sealing body, and the rotating tool is moved along the first abutting portion in a state where the outer peripheral surface of the stirring pin is slightly in contact with the step side surface of the peripheral wall portion. A first main joining step of moving and stirring the friction while allowing the second aluminum alloy of the sealing body to flow into the gap;
A second main joining step in which only the rotating stirring pin is inserted into the sealing body, and the stirring pin is slightly in contact with the end face of the support column, and friction stirring is performed on the fourth abutting portion; The manufacturing method of the liquid cooling jacket characterized by including.   5. The method of manufacturing a liquid cooling jacket according to claim 4, wherein in the first main joining step, friction stirring is further performed in a state where the stirring pin is slightly in contact with the bottom surface of the step portion of the peripheral wall. . The stirring pin has a flat surface perpendicular to the rotation center axis at the tip, and has a protrusion on the flat surface,
In the second main joining step, only the rotating stirring pin is inserted into the sealing body, and the flat surface of the stirring pin is brought into contact with only the sealing body, and the protruding portion of the stirring pin is attached to the support column. The method for manufacturing a liquid cooling jacket according to claim 4 or 5, wherein friction stirring is performed on the fourth butted portion in a state where the end face is in contact with the end face.   The manufacturing method of the liquid cooling jacket as described in any one of Claims 1 thru | or 6 including the temporary joining process of temporarily joining said 1st butt | matching part prior to said 1st main joining process.   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 1 thru | or 7.   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 manufacturing a liquid cooling jacket according to claim 8, wherein:   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 producing a liquid cooling jacket according to any one of claims 1 to 9, wherein the method is performed.   The method for manufacturing a liquid cooling jacket according to claim 10, 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 10 or 11, 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 10 to 12, 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 producing a liquid cooling jacket according to claim 1, wherein:

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