JP2019147180A - Manufacturing method of liquid-cooled jacket - Google Patents

Abstract

To suitably connect a jacket body and a sealing body, which are different in material kind.SOLUTION: An outer peripheral surface F10 of an agitation pin F2 of a rotary tool F is inclined to be tapered. A flat surface F3 is formed on a tip side of the agitation pin F2, and a projection section F4 projecting to the flat surface F3 is formed. A manufacturing method includes: a preparation process for forming a peripheral wall stepped section 12 having a stepped bottom surface 12a and a stepped side surface 12b at an inner peripheral edge of a peripheral wall section; a mounting process for forming a first butting section J1 by butting the stepped side surface 12b and an outer peripheral side surface 3c of a sealing body 3 and forming a second butting section J2 by superposing the stepped bottom surface 12a on a rear face 3b of the sealing body 3; and a regular connection process for inserting only the agitation pin F2 of the rotary tool F into the sealing body 3 and performing frictional agitation in a state in which the outer peripheral surface F10 of the agitation pin F2 is not brought into contact with the stepped side surface 12b and the projection section F4 of the agitation pin F2 is brought into contact with the stepped bottom surface 12a.SELECTED DRAWING: Figure 4

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. 15 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 method for manufacturing a liquid-cooled jacket capable of suitably joining a jacket body and a sealing body having different material types.

  In order to solve such a problem, the present invention comprises a jacket body having a bottom portion and a peripheral wall portion rising from a peripheral edge of the bottom portion, and a sealing body for sealing an opening of the jacket body, and the jacket body And a liquid cooling jacket for joining the sealing body by friction stirring, wherein the jacket body is made of a first aluminum alloy, and the sealing body is made of a second aluminum alloy The first aluminum alloy is a material having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stirring is inclined so as to be tapered, and the tip of the stirring pin A flat surface is formed on the side, and a protrusion protruding from the flat surface is formed. A step bottom surface is formed on the inner peripheral edge of the peripheral wall portion, and the opening is opened from the step bottom surface. A step side surface that rises diagonally so as to spread outward toward the part, and a step of forming the peripheral wall step portion, and the step side surface of the peripheral wall step portion by placing the sealing body on the jacket body And the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and the second abutting portion is formed by overlapping the step bottom surface of the peripheral wall step portion and the back surface of the sealing body. And only the stirring pin of the rotating rotating tool is inserted into the sealing body, the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the peripheral wall step portion, and the protruding portion of the stirring pin And a main joining step of performing frictional stirring by moving the rotary tool along the first abutting portion in a state in which the step is in contact with the step bottom surface of the peripheral wall step portion.

  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 friction stirring is performed by bringing only the stirring pin into contact with the sealing body, it is possible to minimize the mixing of the first aluminum alloy from the jacket body into the sealing body at the first butting portion. Thereby, since the 2nd aluminum alloy by the side of a sealing body is mainly friction-stirred in a 1st butt | matching part, 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. In addition, a flat surface is formed on the tip side of the agitating pin, and a protruding portion protruding from the flat surface is formed. Therefore, the plastic fluidized material that is frictionally stirred along the protruding portion and wound up on the protruding portion. Is held down on a flat surface. Accordingly, the periphery of the protrusion can be more reliably frictionally stirred, and the oxide film of the second butt portion can be reliably divided, so that the bonding strength of the second butt portion can be increased.

  In the present joining step, it is preferable that the stir pin is further subjected to friction stirring in a state where the flat surface of the stirring pin is not brought into contact with the step bottom surface of the peripheral wall step portion. According to this manufacturing method, since the friction stir is performed in a state where the protruding portion of the stirring pin is in contact with the step bottom surface of the peripheral wall step portion, the width of the plasticized region at the step bottom surface can be reduced. Thereby, the width | variety of a step bottom face can also be set small. Further, since only the small protrusions stir the step bottom surface of the jacket body, there is almost no mixing of the first aluminum alloy from the jacket body into the sealing body at the second butting part. Therefore, since the second aluminum alloy on the sealing body side is mainly frictionally stirred at the second butting portion, it is possible to suppress a decrease in bonding strength.

  And this invention is comprised by the jacket main body which has the surrounding wall part which stands up from the peripheral part of the bottom part and the said bottom part, and the sealing body which seals the opening part of the said jacket main body, The said jacket main body and the said sealing body are comprised. A manufacturing method of a liquid cooling jacket joined by friction stirring, wherein the jacket body is made of a first aluminum alloy, the sealing body is made of a second aluminum alloy, and the first aluminum alloy is made of It is a material with higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stirring is inclined so as to be tapered, and a flat surface is formed on the tip side of the stirring pin. In addition, a projection protruding to the flat surface is formed, and a step bottom surface is formed on the inner peripheral edge of the peripheral wall portion, and is widened outward from the step bottom surface toward the opening. A step of forming a peripheral wall step portion having a stepped side surface that rises diagonally, and by placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the sealing body The mounting step of forming the first butting portion by butting the outer peripheral side surface and forming the second butting portion by overlapping the step bottom surface of the circumferential wall step portion and the back surface of the sealing body, and the rotating to rotate Only the stirring pin of the tool is inserted into the sealing body, the outer peripheral surface of the stirring pin is brought into slight contact with the step side surface of the peripheral wall step portion, and the protrusion of the stirring pin is connected to the peripheral wall step portion. And a main joining step of performing frictional stirring by moving the rotary tool along the first butting portion in a state where the step is in contact with the bottom surface of the step.

  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, only the stirring pin is inserted into the sealing body, and the friction stir is performed 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 step portion. Mixing of the first aluminum alloy into the sealing body can be minimized. Thereby, since the 2nd aluminum alloy by the side of a sealing body is mainly friction-stirred in a 1st butt | matching part, 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, since a flat surface is formed on the tip side of the stirring pin, and a protruding portion protruding downward is formed on this flat surface, the plastic flow that is frictionally stirred along the protruding portion and wound up on the protruding portion The material is held down on a flat surface. Accordingly, the periphery of the protrusion can be more reliably frictionally stirred, and the oxide film of the second butt portion can be reliably divided, so that the bonding strength of the second butt portion can be increased.

  In the present joining step, it is preferable that the stir pin is further subjected to friction stirring in a state where the flat surface of the stirring pin is not brought into contact with the step bottom surface of the peripheral wall step portion. According to this manufacturing method, since the friction stir is performed in a state where the protruding portion of the stirring pin is in contact with the step bottom surface of the peripheral wall step portion, the width of the plasticized region at the step bottom surface can be reduced. Thereby, the width | variety of a step bottom face can also be set small. Further, since only the small protrusions stir the step bottom surface of the jacket body, there is almost no mixing of the first aluminum alloy from the jacket body into the sealing body at the second butting part. Therefore, since the second aluminum alloy on the sealing body side is mainly frictionally stirred at the second butting portion, it is possible to suppress a decrease in bonding strength.

  Furthermore, in the present joining step, it is preferable that the rotary tool is moved along the first abutting portion to make a round around the opening portion to perform friction stirring. This manufacturing method can also increase the bonding strength.

  Further, 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 convex on the surface side. It is preferable to form. In friction stir welding, heat shrinkage occurs in the plasticized region due to heat input of friction stir welding, and there is a risk of deformation so that the sealing body side of the liquid cooling jacket becomes concave. The liquid cooling jacket can be flattened by making the main body and the sealing body convex in advance and utilizing heat shrinkage.

  Furthermore, it is preferable that the deformation amount of the jacket body is measured in advance, and in the main joining step, friction stirring is performed while adjusting the insertion depth of the stirring pin of the rotating tool according to the deformation amount. According to such a manufacturing method, even when the jacket main body and the sealing body are curved in a convex shape and the friction stir welding is performed, the length and width of the plasticized region formed in the liquid cooling jacket can be made constant. it can.

  Moreover, it is preferable that this invention further includes the temporary joining process of temporarily joining said 1st butt | matching part prior to the said main joining process. According to this manufacturing method, it is possible to prevent the opening of each butt portion during the main joining step by performing temporary joining.

  Furthermore, the present invention is such that, in the 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 and friction stirring is performed. preferable. 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.

  In the present invention, 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.

  Furthermore, in the present invention, it is preferable that the cooling plate has a cooling flow path through which the cooling medium flows, and the cooling flow path has a planar shape along a movement locus of the rotating tool in the main joining step. According to this manufacturing method, the friction stir part can be intensively cooled, so that the cooling efficiency can be further increased.

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

  According to the manufacturing method of the liquid cooling jacket which concerns on this invention, the jacket main body and sealing body from which a material kind 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 mounting process of the manufacturing method of the liquid cooling jacket which concerns on the 1st modification of 1st embodiment. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid cooling jacket which concerns on the 2nd modification of 1st embodiment. 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 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 figure which shows the 4th modification of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment, Comprising: (a) is a perspective view which shows a table, (b) fixes a jacket main body and a sealing body to a table. It is a perspective view which shows the state which carried out. 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. In the present invention, as shown in FIG. 1, a jacket body 2 and a sealing body 3 are friction stir joined to produce a liquid cooling jacket 1. 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. In addition, the “first main joining step” in the present embodiment corresponds to the “main joining step” in the claims.

  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. The end surface 15 a of the support column 15 is formed at the same height as the step bottom surface 12 a of the peripheral wall step portion 12.

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

  The placing step is a step of placing the sealing body 3 on the jacket body 2 as shown in FIG. In the mounting step, the back surface 3b of the sealing body 3 is mounted on the step bottom surface 12a. 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 (overlaid) to form the second abutting portion J2. In the present embodiment, when the sealing body 3 is placed, the end surface 11a of the peripheral wall portion 11 and the surface 3a of the sealing body 3 are flush with each other. Moreover, the back surface 3b of the sealing body 3 and the end surface 15a of the support | pillar 15 are faced | matched by the mounting process, and the 3rd butt | matching part J3 is formed.

  As shown in 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. Further, a projection F4 protruding downward is formed on the flat surface F3. The protrusion F4 is a part that protrudes downward from the center of the flat surface F3. The shape of the protrusion F4 is not particularly limited, but in the present embodiment, it is a columnar shape. A step portion is formed by the side surface of the protrusion F4 and the flat surface F3. That is, the outer surface of the stirring pin F2 is composed of an outer peripheral surface F10 that is tapered, a flat surface F3 formed at the tip, and an outer peripheral surface and a tip surface of the protrusion F4. When viewed from the side, the inclination angle α formed between the rotation center axis C and the outer peripheral surface F10 of the stirring pin F2 may be set as appropriate within a range of, for example, 5 ° to 30 °. It is set to be the same as the inclination angle β of the 12 step side surfaces 12b.

  A spiral groove is formed on the outer peripheral surface F10 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. A spiral groove may be formed on the outer peripheral surface of the protrusion F4.

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

  As shown in FIG. 4, in the first main joining step, only the stirring pin F2 is inserted into the sealing body 3, and the outer peripheral surface F10 of the stirring pin F2 is not brought into contact with the step side surface 12b of the peripheral wall step portion 12, The rotating tool F is made to make a round along the one-butting portion J1. Furthermore, in this embodiment, the insertion depth is set so that the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a of the peripheral wall step portion 12 of the jacket body 2 and the projection F4 is in contact with the step bottom surface 12a. doing. “Do not bring the outer peripheral surface F10 of the stirring pin into contact with the step side surface 12b of the peripheral wall step portion 12” means that the distance between the outer peripheral surface F10 of the stirring pin F2 and the step side surface 12b is zero during friction stirring. Some cases may also be included.

  If the distance from the step side surface 12b to the outer peripheral surface F10 of the stirring pin F2 is too far, the bonding strength of the first butt portion J1 is lowered. The separation distance L from the step side surface 12b to the outer peripheral surface F10 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 F10 of the stirring pin F2 is stepped as in this embodiment. In the case where the side surface 12b is not contacted and the flat surface F3 is not contacted with the step bottom surface 12a, for example, 0 ≦ L ≦ 0.5 mm is set, and preferably 0 ≦ L ≦ 0.3 mm. .

  When the rotating tool F makes one turn around the sealing body 3, the start end and the end of the plasticizing region W1 are overlapped. The rotary tool F may be gradually lifted and pulled out on the surface 3 a of the sealing body 3. FIG. 5 is a cross-sectional view of the bonded portion after the main bonding step 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. Further, the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a (see FIG. 4), and the plasticized region W1 is formed so as to reach the jacket body 2 beyond the second abutting portion J2. .

  The second main joining step is a step of friction stir welding the third butted portion J3 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, the third butting portion is in a state where the flat surface F3 of the stirring pin F2 is not brought into contact with the support column 15 and the projection F4 is brought into contact with the end surface 15a of the support column 15. The rotary tool F is relatively moved along J3. When the rotating tool F makes one turn along the support column 15, the start end and the end end of the plasticizing region W2 are overlapped. Although the flat surface F3 of the stirring pin F2 is not in contact with the end surface 15a of the support column 15, since the friction stir is performed with the projection F4 in contact with the end surface 15a, the plasticizing region W2 is in the third butt contact. It is formed so as to reach part J3. That is, in the second main joining step, the third butted portion J3 is plastically fluidized and joined by frictional heat between the stirring pin F2, the sealing body 3 and the support column 15.

  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. Further, since the friction stir is performed by contacting the sealing body 3 except for the protrusion F4 of the stirring pin F2, 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 contact between the outer peripheral surface F10 of 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 F10 of the stirring pin F2 are parallel), the stirring pin F2 The stirring pin F2 and the stepped side surface 12b can be made as close as possible while avoiding contact with the stepped side surface 12b.

  Further, in the first main joining step, only the stirring pin F2 is brought into contact with the sealing body 3 to perform friction stir welding, so that the stirring pin F2 is on one side and the other side with respect to the rotation center axis C of the stirring pin F2. Can eliminate the material resistance imbalance. 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 welded portion is reduced by rotating the rotating tool in the direction opposite to the moving direction of the rotating tool.

  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 second butting portion J2, since the projection F4 is formed on the flat surface F3 on the tip side of the stirring pin F2, the plastic flow that is frictionally stirred along the projection F4 and wound up on the projection F4. The material is held down by the flat surface F3. Accordingly, the friction stir around the protrusion portion F4 can be more reliably performed, and the oxide film of the second butting portion J2 can be surely divided, so that the bonding strength of the second butting portion J2 can be increased. Further, since the friction stirrer is performed in a state where the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a and the protrusion F4 is in contact with the step bottom surface 12a of the peripheral wall step portion 12, plasticity at the step bottom surface 12a is achieved. The width of the conversion region can be reduced. Thereby, the width | variety of the level | step difference bottom face 12a can also be set small.

  Further, since the friction stir is performed in a state where the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 12a, the first aluminum alloy is mixed from the jacket body 2 to the sealing body 3 also in the second butting portion J2. Therefore, since the second aluminum alloy on the sealing body 3 side is mainly frictionally stirred at the second butting portion J2, it is possible to suppress a decrease in bonding strength. That is, in this embodiment, mixing of the 1st aluminum alloy from the jacket main body 2 to the sealing body 3 is suppressed, dividing the oxide film of the 2nd butt | matching part J2 reliably.

  Further, in the third butting portion J3, since the frictional stirring is performed in a state where the flat surface F3 of the stirring pin F2 is not in contact with the support column 15 and the projection portion F4 is in contact with the end surface 15a of the support column 15, The plastic fluidized material that has been frictionally stirred along the portion F4 and wound up around the protrusion F4 is pressed by the flat surface F3. Accordingly, the friction stir around the protrusion F4 can be more reliably performed and the oxide film of the third abutting portion J3 can be surely divided, so that the bonding strength of the third abutting portion J3 can be increased. Furthermore, since the width of the plasticized region on the end surface 15a of the support column 15 can be reduced, the width of the support column 15 can also be set small.

  Further, since the frictional stirring is performed in a state where the flat surface F3 of the stirring pin F2 is not in contact with the end surface 15a of the support column 15, the first aluminum alloy from the jacket main body 2 to the sealing body 3 also in the third butting portion J3. Since the second aluminum alloy on the sealing body 3 side is mainly frictionally stirred at the third butted portion J3, it is possible to suppress a decrease in bonding strength. That is, in this embodiment, mixing of the 1st aluminum alloy from the support | pillar 15 to the sealing body 3 is suppressed, dividing the oxide film of the 3rd butt | matching part J3 reliably. Further, the strength of the entire liquid cooling jacket 1 can be increased by joining the support column 15 and the sealing body 3.

  Note that either the first main bonding step or the second main bonding step may be performed first. In addition, before performing the first main joining step, at least one of the first butt portion J1 and the second butt portion J2 may be temporarily joined by friction stirring or welding. By performing a temporary joining process, the opening of each butt | matching part can be prevented in the case of a 1st main joining process and a 2nd main joining process.

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

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

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

  As shown in FIG. 10, the first main joining process is a process of friction stir welding the first butt joint 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 F10 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. Friction stir welding is performed so as not to contact the step bottom surface 12a.

  Here, the contact amount of the outer peripheral surface F10 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 F10 of the stirring pin F2 is brought into contact with the step side surface 12b and the flat surface F3 of the stirring pin F2 is not brought into contact with the step bottom surface 12a as in the present embodiment, the offset amount N is set to 0 <N ≦ It sets between 0.5 mm, Preferably it sets between 0 <N <= 0.25mm.

  In the conventional method for manufacturing a liquid-cooled jacket shown in FIG. 15, since the hardness differs between the jacket 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 F10 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 F10 of the stirring pin F2 are parallel). Therefore, 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.

  In the second embodiment as well, as in the first modification and the second modification of the first embodiment, the thickness of the sealing body 3 may be increased, or an inclined surface may be provided on the side surface.

[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. 11, the third modification is different from the first embodiment in that a temporary joining step, a first main joining step, and a second main joining step are performed using a cooling plate. In the third modified example of the first embodiment, a description will be given centering on portions that are different from the first embodiment.

  As shown in FIG. 11, in the third modification of the first embodiment, the jacket body 2 is fixed to the table K when performing the fixing process. The table K is configured by a substrate K1 having a rectangular parallelepiped shape, clamps K3 formed at four corners of the substrate K1, and a cooling pipe WP disposed inside the substrate K1. The table K is a member that restrains the jacket body 2 from being immovable and functions as a “cooling plate” in the claims.

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

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

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

[Fourth Modification of First Embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on the 4th modification of 1st embodiment is demonstrated. As shown to (a) and (b) of FIG. 12, in the 4th modification of 1st embodiment, it curved so that the surface side of the jacket main body 2 and the surface 3a of the sealing body 3 might become convex shape. It differs from 1st embodiment by the point which performs a 1st main joining process and a 2nd main joining process in a state. The fourth modification will be described with a focus on the differences from the first embodiment.

  As shown in FIGS. 12A and 12B, 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 two 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. 12 (b), when the jacket body 2 and the sealing body 3 are fixed to the table KA, the bottom portion 10, the end surface 11a of the jacket body 2 and the surface 3a of the sealing body 3 are convex upward. To bend. 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. That is, it is moved along the curved surfaces of the end surface 11a of the jacket body 2 and the surface 3a of the sealing body 3 so that the movement locus of the rotary tool F becomes a curve. 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 end face 11a and the surface 3a, the heat shrinkage after the friction stir welding is performed. By using it, the liquid cooling jacket 1 can be made flat. 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. 13, in the fifth modification of the first embodiment, in the preparation step, the jacket body 2 and the sealing body 3 are formed in advance so as to be curved in a convex shape on the surface side. 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. 14, 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. That is, it is moved along the end surface 11a of the jacket body 2 and the surface 3a of the sealing body 3 so that the movement locus of the rotary tool F 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 Recessed portion 15 Post 15a End surface F Rotating tool F2 Surface F4 Projection F10 Peripheral surface J1 First butt J2 Second butt J3 Third butt K Table (cooling plate)
W1 Plasticization region W2 Plasticization region WP Cooling pipe

Claims (13)

A liquid composed of a jacket main body having a bottom and a peripheral wall portion rising from a peripheral edge of the bottom, and a sealing body for sealing an opening of the jacket main body, and joining the jacket main body and the sealing body by friction stirring. A method of manufacturing a cold jacket,
The jacket body is formed of a first aluminum alloy, the sealing body is formed of a second aluminum alloy, and the first aluminum alloy is a material having a higher hardness than the second aluminum alloy,
The outer peripheral surface of the stirring pin of the rotary tool used for friction stirring is inclined so as to be tapered,
A flat surface is formed on the tip side of the stirring pin, and a protrusion protruding on the flat surface is formed,
A preparatory step of forming a peripheral wall step portion having a step bottom surface and a step side surface rising obliquely so as to spread outward from the step bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion;
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and a step bottom surface of the peripheral wall step portion And a mounting step of forming a second butt portion by overlapping the back surface of the sealing body,
Only the stirring pin of the rotating tool that rotates is inserted into the sealing body, the outer peripheral surface of the stirring pin is not brought into contact with the step side surface of the peripheral wall step portion, and the protrusion of the stirring pin is And a main joining step of performing frictional stirring by moving the rotary tool along the first abutting portion in a state where the peripheral wall step portion is in contact with the step bottom surface. Method. 2. The method of manufacturing a liquid cooling jacket according to claim 1, wherein, in the main joining step, friction stirring is performed in a state where the flat surface of the stirring pin is not in contact with the step bottom surface of the peripheral wall step portion. A liquid composed of a jacket main body having a bottom and a peripheral wall portion rising from a peripheral edge of the bottom, and a sealing body for sealing an opening of the jacket main body, and joining the jacket main body and the sealing body by friction stirring. A method of manufacturing a cold jacket,
The jacket body is formed of a first aluminum alloy, the sealing body is formed of a second aluminum alloy, and the first aluminum alloy is a material having a higher hardness than the second aluminum alloy,
The outer peripheral surface of the stirring pin of the rotary tool used for friction stirring is inclined so as to be tapered,
A flat surface is formed on the tip side of the stirring pin, and a protrusion protruding on the flat surface is formed,
A preparatory step of forming a peripheral wall step portion having a step bottom surface and a step side surface rising obliquely so as to spread outward from the step bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion;
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and a step bottom surface of the peripheral wall step portion And a mounting step of forming a second butt portion by overlapping the back surface of the sealing body,
Only the stirring pin of the rotating tool that rotates is inserted into the sealing body, the outer peripheral surface of the stirring pin is slightly in contact with the step side surface of the peripheral wall step portion, and the protrusion of the stirring pin is And a main joining step of performing frictional stirring by moving the rotary tool along the first abutting portion in a state of being in contact with the bottom surface of the step portion of the peripheral wall step portion. Production method. 4. The method for manufacturing a liquid cooling jacket according to claim 3, wherein, in the main joining step, friction stirring is performed in a state where the flat surface of the stirring pin is not in contact with the step bottom surface of the peripheral wall step portion. 5. The friction agitation is performed by moving the rotating tool along the first butting portion and making a round around the opening in the main joining step. 6. The manufacturing method of the liquid cooling jacket as described in 1 .. 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 5. The amount of deformation of the jacket body is measured in advance, and in the 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 manufacturing method of the liquid cooling jacket as described in any one of Claims 1 thru | or 6. The method for manufacturing a liquid cooling jacket according to any one of claims 1 to 7, further comprising a temporary bonding step of temporarily bonding the first butted portion prior to the main bonding step. In the main joining step, a cooling plate through which a cooling medium flows is installed on the back side of the bottom, and friction stirring is performed while cooling the jacket body and the sealing body with the cooling plate. The manufacturing method of the liquid cooling jacket as described in any one of thru | or 8 thru | or 8. The method for manufacturing a liquid cooling jacket according to claim 9, 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 9 or 10, wherein the cooling flow path has a planar shape along a movement locus of the rotary tool in the main joining step. The method for manufacturing a liquid cooling jacket according to any one of claims 9 to 11, wherein the cooling flow path through which the cooling medium flows is configured by a cooling pipe embedded in the cooling plate. . In the main joining step, a cooling medium is caused to flow through a hollow portion formed by the jacket body and the sealing body, and friction stirring is performed while cooling the jacket body and the sealing body. The manufacturing method of the liquid cooling jacket as described in any one of Claim 1 thru | or 12.

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